Allow dragging seed phrase during Confirm Seed Phrase (#6557)

* Add basic drag and drop functionality

* Refactor seed phrase data structure

* Insert to list when drop

* Save before refactor

* Finish DND

* Fix linter

* update package-lock.json

* Address styling feedbacks

* Add box shadow on hover

* Finish adding unit tests

* Remove describe.only

8 files changed, 818 insertions, 277 deletions

diff --git a/package-lock.json b/package-lock.json
index 902dbe004..99aac3d53 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1746,6 +1746,16 @@
         }
       }
     },
+    "@types/invariant": {
+      "version": "2.2.29",
+      "resolved": "https://registry.npmjs.org/@types/invariant/-/invariant-2.2.29.tgz",
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+    },
+    "@types/lodash": {
+      "version": "4.14.123",
+      "resolved": "https://registry.npmjs.org/@types/lodash/-/lodash-4.14.123.tgz",
+      "integrity": "sha512-pQvPkc4Nltyx7G1Ww45OjVqUsJP4UsZm+GWJpigXgkikZqJgRm4c48g027o6tdgubWHwFRF15iFd+Y4Pmqv6+Q=="
+    },
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       "version": "8.5.5",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-8.5.5.tgz",
@@ -1768,6 +1778,14 @@
         "@types/react": "*"
       }
     },
+    "@types/redux": {
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/@types/redux/-/redux-3.6.0.tgz",
+      "integrity": "sha1-8evh5UEVGAcuT9/KXHbhbnTBOZo=",
+      "requires": {
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+      }
+    },
     "@yarnpkg/lockfile": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@yarnpkg/lockfile/-/lockfile-1.1.0.tgz",
@@ -8281,6 +8299,55 @@
         }
       }
     },
+    "disposables": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/disposables/-/disposables-1.0.2.tgz",
+      "integrity": "sha1-NsamdEdfVaLWkTVnpgFETkh7S24="
+    },
+    "dnd-core": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/dnd-core/-/dnd-core-3.0.2.tgz",
+      "integrity": "sha1-6UdXdiBTHH7jelGM1d3hfQ798PM=",
+      "requires": {
+        "@types/invariant": "^2.2.29",
+        "@types/lodash": "^4.14.107",
+        "@types/node": "^8.10.11",
+        "@types/redux": "^3.6.0",
+        "asap": "^2.0.6",
+        "invariant": "^2.0.0",
+        "lodash": "^4.2.0",
+        "redux": "^4.0.0"
+      },
+      "dependencies": {
+        "@types/node": {
+          "version": "8.10.48",
+          "resolved": "https://registry.npmjs.org/@types/node/-/node-8.10.48.tgz",
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+        },
+        "loose-envify": {
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+          "resolved": "https://registry.npmjs.org/loose-envify/-/loose-envify-1.4.0.tgz",
+          "integrity": "sha512-lyuxPGr/Wfhrlem2CL/UcnUc1zcqKAImBDzukY7Y5F/yQiNdko6+fRLevlw1HgMySw7f611UIY408EtxRSoK3Q==",
+          "requires": {
+            "js-tokens": "^3.0.0 || ^4.0.0"
+          }
+        },
+        "redux": {
+          "version": "4.0.1",
+          "resolved": "https://registry.npmjs.org/redux/-/redux-4.0.1.tgz",
+          "integrity": "sha512-R7bAtSkk7nY6O/OYMVR9RiBI+XghjF9rlbl5806HJbQph0LJVHZrU5oaO4q70eUKiqMRqm4y07KLTlMZ2BlVmg==",
+          "requires": {
+            "loose-envify": "^1.4.0",
+            "symbol-observable": "^1.2.0"
+          }
+        },
+        "symbol-observable": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/symbol-observable/-/symbol-observable-1.2.0.tgz",
+          "integrity": "sha512-e900nM8RRtGhlV36KGEU9k65K3mPb1WV70OdjfxlG2EAuM1noi/E/BaW/uMhL7bPEssK8QV57vN3esixjUvcXQ=="
+        }
+      }
+    },
     "dnode": {
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@@ -9804,18 +9871,18 @@
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               "from": "git+https://github.com/ethereumjs/ethereumjs-abi.git",
               "requires": {
-                "bn.js": "^4.11.8",
-                "ethereumjs-util": "^6.0.0"
+                "bn.js": "^4.10.0",
+                "ethereumjs-util": "^5.0.0"
               },
               "dependencies": {
                 "ethereumjs-util": {
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-                  "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-6.1.0.tgz",
-                  "integrity": "sha512-URESKMFbDeJxnAxPppnk2fN6Y3BIatn9fwn76Lm8bQlt+s52TpG8dN9M66MLPuRAiAOIqL3dfwqWJf0sd0fL0Q==",
+                  "version": "5.2.0",
+                  "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-5.2.0.tgz",
+                  "integrity": "sha512-CJAKdI0wgMbQFLlLRtZKGcy/L6pzVRgelIZqRqNbuVFM3K9VEnyfbcvz0ncWMRNCe4kaHWjwRYQcYMucmwsnWA==",
                   "requires": {
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-                    "ethjs-util": "0.1.6",
+                    "ethjs-util": "^0.1.3",
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@@ -9823,23 +9890,15 @@
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-              "integrity": "sha512-CUnVOQq7gSpDHZVVrQW8ExxUETWrnrvXYvYz55wOU8Uj4VCgw56XC2B/fVqQN+f7gmrnRHSLVnFAwsCuNwji8w==",
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-                "strip-hex-prefix": "1.0.0"
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           }
         },
         "ethereumjs-abi": {
-          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#2863c40e0982acfc0b7163f0285d4c56427c7799",
+          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#d84a96796079c8595a0c78accd1e7709f2277215",
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           "requires": {
-            "bn.js": "^4.11.8"
+            "bn.js": "^4.10.0",
+            "ethereumjs-util": "^5.0.0"
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         },
         "ethereumjs-util": {
@@ -9873,7 +9932,7 @@
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-          "resolved": "https://registry.npmjs.org/babelify/-/babelify-7.3.0.tgz",
+          "resolved": "http://registry.npmjs.org/babelify/-/babelify-7.3.0.tgz",
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@@ -9918,18 +9977,18 @@
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-                "bn.js": "^4.11.8",
-                "ethereumjs-util": "^6.0.0"
+                "bn.js": "^4.10.0",
+                "ethereumjs-util": "^5.0.0"
               },
               "dependencies": {
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+                  "version": "5.2.0",
+                  "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-5.2.0.tgz",
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                   "requires": {
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                     "create-hash": "^1.1.2",
-                    "ethjs-util": "0.1.6",
+                    "ethjs-util": "^0.1.3",
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@@ -9937,15 +9996,6 @@
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@@ -9953,7 +10003,8 @@
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-            "bn.js": "^4.11.8"
+            "bn.js": "^4.10.0",
+            "ethereumjs-util": "^5.0.0"
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         "ethereumjs-util": {
@@ -10122,19 +10173,19 @@
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               "dev": true,
               "requires": {
-                "bn.js": "^4.11.8",
-                "ethereumjs-util": "^6.0.0"
+                "bn.js": "^4.10.0",
+                "ethereumjs-util": "^5.0.0"
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               "dependencies": {
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+                  "version": "5.2.0",
+                  "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-5.2.0.tgz",
+                  "integrity": "sha512-CJAKdI0wgMbQFLlLRtZKGcy/L6pzVRgelIZqRqNbuVFM3K9VEnyfbcvz0ncWMRNCe4kaHWjwRYQcYMucmwsnWA==",
                   "dev": true,
                   "requires": {
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-                    "ethjs-util": "0.1.6",
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@@ -10142,31 +10193,21 @@
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-          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#2863c40e0982acfc0b7163f0285d4c56427c7799",
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@@ -10267,7 +10308,8 @@
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@@ -10576,7 +10618,8 @@
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+            "bn.js": "^4.10.0",
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@@ -13616,7 +13659,7 @@
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@@ -13785,13 +13828,13 @@
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@@ -15292,7 +15335,7 @@
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@@ -29849,16 +29892,6 @@
       "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
       "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY="
     },
-    "ping-pong-stream": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/ping-pong-stream/-/ping-pong-stream-1.0.0.tgz",
-      "integrity": "sha1-TF6wm6atsCGInawNyr+45XcGhUo=",
-      "requires": {
-        "end-of-stream": "^1.1.0",
-        "readable-stream": "^2.1.5",
-        "tape": "^4.6.2"
-      }
-    },
     "pinkie": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/pinkie/-/pinkie-2.0.4.tgz",
@@ -32546,6 +32579,84 @@
         }
       }
     },
+    "react-dnd": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/react-dnd/-/react-dnd-3.0.2.tgz",
+      "integrity": "sha1-sMI9jYKWn1t740y8T4T6H/xcfdw=",
+      "requires": {
+        "disposables": "^1.0.1",
+        "dnd-core": "^3.0.2",
+        "hoist-non-react-statics": "^2.5.0",
+        "invariant": "^2.1.0",
+        "lodash": "^4.2.0",
+        "prop-types": "^15.5.10",
+        "shallowequal": "^1.0.2"
+      },
+      "dependencies": {
+        "hoist-non-react-statics": {
+          "version": "2.5.5",
+          "resolved": "https://registry.npmjs.org/hoist-non-react-statics/-/hoist-non-react-statics-2.5.5.tgz",
+          "integrity": "sha512-rqcy4pJo55FTTLWt+bU8ukscqHeE/e9KWvsOW2b/a3afxQZhwkQdT1rPPCJ0rYXdj4vNcasY8zHTH+jF/qStxw=="
+        },
+        "shallowequal": {
+          "version": "1.1.0",
+          "resolved": "https://registry.npmjs.org/shallowequal/-/shallowequal-1.1.0.tgz",
+          "integrity": "sha512-y0m1JoUZSlPAjXVtPPW70aZWfIL/dSP7AFkRnniLCrK/8MDKog3TySTBmckD+RObVxH0v4Tox67+F14PdED2oQ=="
+        }
+      }
+    },
+    "react-dnd-html5-backend": {
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/react-dnd-html5-backend/-/react-dnd-html5-backend-7.4.4.tgz",
+      "integrity": "sha512-X/lP92ateY0glHan8mU0JzjBuZL6VHv2Gc/H9OBBxaf/ZCN1oC16MLKdesqG4x1f/NWFTNtuG3W4B99r5gPVog==",
+      "requires": {
+        "dnd-core": "^7.4.4"
+      },
+      "dependencies": {
+        "dnd-core": {
+          "version": "7.4.4",
+          "resolved": "https://registry.npmjs.org/dnd-core/-/dnd-core-7.4.4.tgz",
+          "integrity": "sha512-xR8SINDCJG9AmKSjXUMJ1PEl8ih1+xSHH8x4DgBtzScXnEtpCnV1ibDZNV0uyps9VgkXTTbYYzJdF04y0v0e3Q==",
+          "requires": {
+            "asap": "^2.0.6",
+            "invariant": "^2.2.4",
+            "redux": "^4.0.1"
+          }
+        },
+        "invariant": {
+          "version": "2.2.4",
+          "resolved": "https://registry.npmjs.org/invariant/-/invariant-2.2.4.tgz",
+          "integrity": "sha512-phJfQVBuaJM5raOpJjSfkiD6BpbCE4Ns//LaXl6wGYtUBY83nWS6Rf9tXm2e8VaK60JEjYldbPif/A2B1C2gNA==",
+          "requires": {
+            "loose-envify": "^1.0.0"
+          }
+        },
+        "redux": {
+          "version": "4.0.1",
+          "resolved": "https://registry.npmjs.org/redux/-/redux-4.0.1.tgz",
+          "integrity": "sha512-R7bAtSkk7nY6O/OYMVR9RiBI+XghjF9rlbl5806HJbQph0LJVHZrU5oaO4q70eUKiqMRqm4y07KLTlMZ2BlVmg==",
+          "requires": {
+            "loose-envify": "^1.4.0",
+            "symbol-observable": "^1.2.0"
+          },
+          "dependencies": {
+            "loose-envify": {
+              "version": "1.4.0",
+              "resolved": "https://registry.npmjs.org/loose-envify/-/loose-envify-1.4.0.tgz",
+              "integrity": "sha512-lyuxPGr/Wfhrlem2CL/UcnUc1zcqKAImBDzukY7Y5F/yQiNdko6+fRLevlw1HgMySw7f611UIY408EtxRSoK3Q==",
+              "requires": {
+                "js-tokens": "^3.0.0 || ^4.0.0"
+              }
+            }
+          }
+        },
+        "symbol-observable": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/symbol-observable/-/symbol-observable-1.2.0.tgz",
+          "integrity": "sha512-e900nM8RRtGhlV36KGEU9k65K3mPb1WV70OdjfxlG2EAuM1noi/E/BaW/uMhL7bPEssK8QV57vN3esixjUvcXQ=="
+        }
+      }
+    },
     "react-docgen": {
       "version": "3.0.0-beta9",
       "resolved": "https://registry.npmjs.org/react-docgen/-/react-docgen-3.0.0-beta9.tgz",
@@ -38924,34 +39035,24 @@
           "from": "git+https://github.com/ethereumjs/ethereumjs-abi.git",
           "dev": true,
           "requires": {
-            "bn.js": "^4.11.8",
-            "ethereumjs-util": "^6.0.0"
+            "bn.js": "^4.10.0",
+            "ethereumjs-util": "^5.0.0"
           },
           "dependencies": {
             "ethereumjs-util": {
-              "version": "6.1.0",
-              "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-6.1.0.tgz",
-              "integrity": "sha512-URESKMFbDeJxnAxPppnk2fN6Y3BIatn9fwn76Lm8bQlt+s52TpG8dN9M66MLPuRAiAOIqL3dfwqWJf0sd0fL0Q==",
+              "version": "5.2.0",
+              "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-5.2.0.tgz",
+              "integrity": "sha512-CJAKdI0wgMbQFLlLRtZKGcy/L6pzVRgelIZqRqNbuVFM3K9VEnyfbcvz0ncWMRNCe4kaHWjwRYQcYMucmwsnWA==",
               "dev": true,
               "requires": {
                 "bn.js": "^4.11.0",
                 "create-hash": "^1.1.2",
-                "ethjs-util": "0.1.6",
+                "ethjs-util": "^0.1.3",
                 "keccak": "^1.0.2",
                 "rlp": "^2.0.0",
                 "safe-buffer": "^5.1.1",
                 "secp256k1": "^3.0.1"
               }
-            },
-            "ethjs-util": {
-              "version": "0.1.6",
-              "resolved": "https://registry.npmjs.org/ethjs-util/-/ethjs-util-0.1.6.tgz",
-              "integrity": "sha512-CUnVOQq7gSpDHZVVrQW8ExxUETWrnrvXYvYz55wOU8Uj4VCgw56XC2B/fVqQN+f7gmrnRHSLVnFAwsCuNwji8w==",
-              "dev": true,
-              "requires": {
-                "is-hex-prefixed": "1.0.0",
-                "strip-hex-prefix": "1.0.0"
-              }
             }
           }
         },
diff --git a/package.json b/package.json
index 21e9b0de8..0626b4ac8 100644
--- a/package.json
+++ b/package.json
@@ -151,6 +151,8 @@
     "ramda": "^0.24.1",
     "react": "^15.6.2",
     "react-addons-css-transition-group": "^15.6.0",
+    "react-dnd": "^3.0.2",
+    "react-dnd-html5-backend": "^7.4.4",
     "react-dom": "^15.6.2",
     "react-hyperscript": "^3.0.0",
     "react-inspector": "^2.3.0",
diff --git a/ui/app/pages/first-time-flow/seed-phrase/confirm-seed-phrase/confirm-seed-phrase.component.js b/ui/app/pages/first-time-flow/seed-phrase/confirm-seed-phrase/confirm-seed-phrase.component.js
index f3bfc3171..04fe651e6 100644
--- a/ui/app/pages/first-time-flow/seed-phrase/confirm-seed-phrase/confirm-seed-phrase.component.js
+++ b/ui/app/pages/first-time-flow/seed-phrase/confirm-seed-phrase/confirm-seed-phrase.component.js
@@ -8,7 +8,9 @@ import {
   INITIALIZE_SEED_PHRASE_ROUTE,
 } from '../../../../helpers/constants/routes'
 import { exportAsFile } from '../../../../helpers/utils/util'
-import { selectSeedWord, deselectSeedWord } from './confirm-seed-phrase.state'
+import DraggableSeed from './draggable-seed.component'
+
+const EMPTY_SEEDS = Array(12).fill(null)
 
 export default class ConfirmSeedPhrase extends PureComponent {
   static contextTypes = {
@@ -27,10 +29,32 @@ export default class ConfirmSeedPhrase extends PureComponent {
   }
 
   state = {
-    selectedSeedWords: [],
+    selectedSeedIndices: [],
     shuffledSeedWords: [],
-    // Hash of shuffledSeedWords index {Number} to selectedSeedWords index {Number}
-    selectedSeedWordsHash: {},
+    pendingSeedIndices: [],
+    draggingSeedIndex: -1,
+    hoveringIndex: -1,
+    isDragging: false,
+  }
+
+  shouldComponentUpdate (nextProps, nextState, nextContext) {
+    const { seedPhrase } = this.props
+    const {
+      selectedSeedIndices,
+      shuffledSeedWords,
+      pendingSeedIndices,
+      draggingSeedIndex,
+      hoveringIndex,
+      isDragging,
+    } = this.state
+
+    return seedPhrase !== nextProps.seedPhrase ||
+      draggingSeedIndex !== nextState.draggingSeedIndex ||
+      isDragging !== nextState.isDragging ||
+      hoveringIndex !== nextState.hoveringIndex ||
+      selectedSeedIndices.join(' ') !== nextState.selectedSeedIndices.join(' ') ||
+      shuffledSeedWords.join(' ') !== nextState.shuffledSeedWords.join(' ') ||
+      pendingSeedIndices.join(' ') !== nextState.pendingSeedIndices.join(' ')
   }
 
   componentDidMount () {
@@ -39,6 +63,26 @@ export default class ConfirmSeedPhrase extends PureComponent {
     this.setState({ shuffledSeedWords })
   }
 
+  setDraggingSeedIndex = draggingSeedIndex => this.setState({ draggingSeedIndex })
+
+  setHoveringIndex = hoveringIndex => this.setState({ hoveringIndex })
+
+  onDrop = targetIndex => {
+    const {
+      selectedSeedIndices,
+      draggingSeedIndex,
+    } = this.state
+
+    const indices = insert(selectedSeedIndices, draggingSeedIndex, targetIndex, true)
+
+    this.setState({
+      selectedSeedIndices: indices,
+      pendingSeedIndices: indices,
+      draggingSeedIndex: -1,
+      hoveringIndex: -1,
+    })
+  }
+
   handleExport = () => {
     exportAsFile('MetaMask Secret Backup Phrase', this.props.seedPhrase, 'text/plain')
   }
@@ -65,23 +109,34 @@ export default class ConfirmSeedPhrase extends PureComponent {
   }
 
   handleSelectSeedWord = (word, shuffledIndex) => {
-    this.setState(selectSeedWord(word, shuffledIndex))
+    this.setState({
+      selectedSeedIndices: [...this.state.selectedSeedIndices, shuffledIndex],
+      pendingSeedIndices: [...this.state.pendingSeedIndices, shuffledIndex],
+    })
   }
 
   handleDeselectSeedWord = shuffledIndex => {
-    this.setState(deselectSeedWord(shuffledIndex))
+    this.setState({
+      selectedSeedIndices: this.state.selectedSeedIndices.filter(i => shuffledIndex !== i),
+      pendingSeedIndices: this.state.pendingSeedIndices.filter(i => shuffledIndex !== i),
+    })
   }
 
   isValid () {
     const { seedPhrase } = this.props
-    const { selectedSeedWords } = this.state
+    const { selectedSeedIndices, shuffledSeedWords } = this.state
+    const selectedSeedWords = selectedSeedIndices.map(i => shuffledSeedWords[i])
     return seedPhrase === selectedSeedWords.join(' ')
   }
 
   render () {
     const { t } = this.context
     const { history } = this.props
-    const { selectedSeedWords, shuffledSeedWords, selectedSeedWordsHash } = this.state
+    const {
+      selectedSeedIndices,
+      shuffledSeedWords,
+      draggingSeedIndex,
+    } = this.state
 
     return (
       <div className="confirm-seed-phrase">
@@ -102,31 +157,30 @@ export default class ConfirmSeedPhrase extends PureComponent {
         <div className="first-time-flow__text-block">
           { t('selectEachPhrase') }
         </div>
-        <div className="confirm-seed-phrase__selected-seed-words">
-          {
-            selectedSeedWords.map((word, index) => (
-              <div
-                key={index}
-                className="confirm-seed-phrase__seed-word"
-              >
-                { word }
-              </div>
-            ))
-          }
+        <div
+          className={classnames('confirm-seed-phrase__selected-seed-words', {
+            'confirm-seed-phrase__selected-seed-words--dragging': draggingSeedIndex > -1,
+          })}
+        >
+          { this.renderPendingSeeds() }
+          { this.renderSelectedSeeds() }
         </div>
         <div className="confirm-seed-phrase__shuffled-seed-words">
           {
             shuffledSeedWords.map((word, index) => {
-              const isSelected = index in selectedSeedWordsHash
+              const isSelected = selectedSeedIndices.includes(index)
 
               return (
-                <div
+                <DraggableSeed
                   key={index}
-                  className={classnames(
-                    'confirm-seed-phrase__seed-word',
-                    'confirm-seed-phrase__seed-word--shuffled',
-                    { 'confirm-seed-phrase__seed-word--selected': isSelected }
-                  )}
+                  seedIndex={index}
+                  index={index}
+                  draggingSeedIndex={this.state.draggingSeedIndex}
+                  setDraggingSeedIndex={this.setDraggingSeedIndex}
+                  setHoveringIndex={this.setHoveringIndex}
+                  onDrop={this.onDrop}
+                  className="confirm-seed-phrase__seed-word--shuffled"
+                  selected={isSelected}
                   onClick={() => {
                     if (!isSelected) {
                       this.handleSelectSeedWord(word, index)
@@ -134,9 +188,8 @@ export default class ConfirmSeedPhrase extends PureComponent {
                       this.handleDeselectSeedWord(index)
                     }
                   }}
-                >
-                  { word }
-                </div>
+                  word={word}
+                />
               )
             })
           }
@@ -152,4 +205,80 @@ export default class ConfirmSeedPhrase extends PureComponent {
       </div>
     )
   }
+
+  renderSelectedSeeds () {
+    const { shuffledSeedWords, selectedSeedIndices, draggingSeedIndex } = this.state
+    return EMPTY_SEEDS.map((_, index) => {
+      const seedIndex = selectedSeedIndices[index]
+      const word = shuffledSeedWords[seedIndex]
+
+      return (
+        <DraggableSeed
+          key={`selected-${seedIndex}-${index}`}
+          className="confirm-seed-phrase__selected-seed-words__selected-seed"
+          index={index}
+          seedIndex={seedIndex}
+          word={word}
+          draggingSeedIndex={draggingSeedIndex}
+          setDraggingSeedIndex={this.setDraggingSeedIndex}
+          setHoveringIndex={this.setHoveringIndex}
+          onDrop={this.onDrop}
+          draggable
+        />
+      )
+    })
+  }
+
+  renderPendingSeeds () {
+    const {
+      pendingSeedIndices,
+      shuffledSeedWords,
+      draggingSeedIndex,
+      hoveringIndex,
+    } = this.state
+
+    const indices = insert(pendingSeedIndices, draggingSeedIndex, hoveringIndex)
+
+    return EMPTY_SEEDS.map((_, index) => {
+      const seedIndex = indices[index]
+      const word = shuffledSeedWords[seedIndex]
+
+      return (
+        <DraggableSeed
+          key={`pending-${seedIndex}-${index}`}
+          index={index}
+          className={classnames('confirm-seed-phrase__selected-seed-words__pending-seed', {
+            'confirm-seed-phrase__seed-word--hidden': draggingSeedIndex === seedIndex && index !== hoveringIndex,
+          })}
+          seedIndex={seedIndex}
+          word={word}
+          draggingSeedIndex={draggingSeedIndex}
+          setDraggingSeedIndex={this.setDraggingSeedIndex}
+          setHoveringIndex={this.setHoveringIndex}
+          onDrop={this.onDrop}
+          droppable={!!word}
+        />
+      )
+    })
+  }
+}
+
+function insert (list, value, target, removeOld) {
+  let nextList = [...list]
+
+  if (typeof list[target] === 'number') {
+    nextList = [...list.slice(0, target), value, ...list.slice(target)]
+  }
+
+  if (removeOld) {
+    nextList = nextList.filter((seed, i) => {
+      return seed !== value || i === target
+    })
+  }
+
+  if (nextList.length > 12) {
+    nextList.pop()
+  }
+
+  return nextList
 }
diff --git a/ui/app/pages/first-time-flow/seed-phrase/confirm-seed-phrase/confirm-seed-phrase.state.js b/ui/app/pages/first-time-flow/seed-phrase/confirm-seed-phrase/confirm-seed-phrase.state.js
deleted file mode 100644
index f2476fc5c..000000000
--- a/ui/app/pages/first-time-flow/seed-phrase/confirm-seed-phrase/confirm-seed-phrase.state.js
+++ /dev/null
@@ -1,41 +0,0 @@
-export function selectSeedWord (word, shuffledIndex) {
-  return function update (state) {
-    const { selectedSeedWords, selectedSeedWordsHash } = state
-    const nextSelectedIndex = selectedSeedWords.length
-
-    return {
-      selectedSeedWords: [ ...selectedSeedWords, word ],
-      selectedSeedWordsHash: { ...selectedSeedWordsHash, [shuffledIndex]: nextSelectedIndex },
-    }
-  }
-}
-
-export function deselectSeedWord (shuffledIndex) {
-  return function update (state) {
-    const {
-      selectedSeedWords: prevSelectedSeedWords,
-      selectedSeedWordsHash: prevSelectedSeedWordsHash,
-    } = state
-
-    const selectedSeedWords = [...prevSelectedSeedWords]
-    const indexToRemove = prevSelectedSeedWordsHash[shuffledIndex]
-    selectedSeedWords.splice(indexToRemove, 1)
-    const selectedSeedWordsHash = Object.keys(prevSelectedSeedWordsHash).reduce((acc, index) => {
-      const output = { ...acc }
-      const selectedSeedWordIndex = prevSelectedSeedWordsHash[index]
-
-      if (selectedSeedWordIndex < indexToRemove) {
-        output[index] = selectedSeedWordIndex
-      } else if (selectedSeedWordIndex > indexToRemove) {
-        output[index] = selectedSeedWordIndex - 1
-      }
-
-      return output
-    }, {})
-
-    return {
-      selectedSeedWords,
-      selectedSeedWordsHash,
-    }
-  }
-}
diff --git a/ui/app/pages/first-time-flow/seed-phrase/confirm-seed-phrase/draggable-seed.component.js b/ui/app/pages/first-time-flow/seed-phrase/confirm-seed-phrase/draggable-seed.component.js
new file mode 100644
index 000000000..97dbd2a4b
--- /dev/null
+++ b/ui/app/pages/first-time-flow/seed-phrase/confirm-seed-phrase/draggable-seed.component.js
@@ -0,0 +1,126 @@
+import React, { Component } from 'react'
+import PropTypes from 'prop-types'
+import classnames from 'classnames'
+import { DragSource, DropTarget } from 'react-dnd'
+
+class DraggableSeed extends Component {
+
+  static propTypes = {
+    // React DnD Props
+    connectDragSource: PropTypes.func.isRequired,
+    connectDropTarget: PropTypes.func.isRequired,
+    isDragging: PropTypes.bool,
+    isOver: PropTypes.bool,
+    canDrop: PropTypes.bool,
+    // Own Props
+    onClick: PropTypes.func.isRequired,
+    setHoveringIndex: PropTypes.func.isRequired,
+    index: PropTypes.number,
+    draggingSeedIndex: PropTypes.number,
+    word: PropTypes.string,
+    className: PropTypes.string,
+    selected: PropTypes.bool,
+    droppable: PropTypes.bool,
+  }
+
+  static defaultProps = {
+    className: '',
+    onClick () {},
+  }
+
+  componentWillReceiveProps (nextProps, nextContext) {
+    const { isOver, setHoveringIndex } = this.props
+    if (isOver && !nextProps.isOver) {
+      setHoveringIndex(-1)
+    }
+  }
+
+  render () {
+    const {
+      connectDragSource,
+      connectDropTarget,
+      isDragging,
+      index,
+      word,
+      selected,
+      className,
+      onClick,
+      isOver,
+      canDrop,
+    } = this.props
+
+    return connectDropTarget(connectDragSource(
+      <div
+        key={index}
+        className={classnames('btn-secondary confirm-seed-phrase__seed-word', className, {
+          'confirm-seed-phrase__seed-word--selected btn-primary': selected,
+          'confirm-seed-phrase__seed-word--dragging': isDragging,
+          'confirm-seed-phrase__seed-word--empty': !word,
+          'confirm-seed-phrase__seed-word--active-drop': !isOver && canDrop,
+          'confirm-seed-phrase__seed-word--drop-hover': isOver && canDrop,
+        })}
+        onClick={onClick}
+      >
+        { word }
+      </div>
+    ))
+  }
+}
+
+const SEEDWORD = 'SEEDWORD'
+
+const seedSource = {
+  beginDrag (props) {
+    setTimeout(() => props.setDraggingSeedIndex(props.seedIndex), 0)
+    return {
+      seedIndex: props.seedIndex,
+      word: props.word,
+    }
+  },
+  canDrag (props) {
+    return props.draggable
+  },
+  endDrag (props, monitor) {
+    const dropTarget = monitor.getDropResult()
+
+    if (!dropTarget) {
+      setTimeout(() => props.setDraggingSeedIndex(-1), 0)
+      return
+    }
+
+    props.onDrop(dropTarget.targetIndex)
+  },
+}
+
+const seedTarget = {
+  drop (props) {
+    return {
+      targetIndex: props.index,
+    }
+  },
+  canDrop (props) {
+    return props.droppable
+  },
+  hover (props) {
+    props.setHoveringIndex(props.index)
+  },
+}
+
+const collectDrag = (connect, monitor) => {
+  return {
+    connectDragSource: connect.dragSource(),
+    isDragging: monitor.isDragging(),
+  }
+}
+
+const collectDrop = (connect, monitor) => {
+  return {
+    connectDropTarget: connect.dropTarget(),
+    isOver: monitor.isOver(),
+    canDrop: monitor.canDrop(),
+  }
+}
+
+export default DropTarget(SEEDWORD, seedTarget, collectDrop)(DragSource(SEEDWORD, seedSource, collectDrag)(DraggableSeed))
+
+
diff --git a/ui/app/pages/first-time-flow/seed-phrase/confirm-seed-phrase/index.scss b/ui/app/pages/first-time-flow/seed-phrase/confirm-seed-phrase/index.scss
index 93137618c..f025a503f 100644
--- a/ui/app/pages/first-time-flow/seed-phrase/confirm-seed-phrase/index.scss
+++ b/ui/app/pages/first-time-flow/seed-phrase/confirm-seed-phrase/index.scss
@@ -3,37 +3,58 @@
     margin-bottom: 12px;
   }
 
-  &__selected-seed-words {
-    min-height: 190px;
-    max-width: 496px;
-    border: 1px solid #CDCDCD;
-    border-radius: 6px;
-    background-color: $white;
-    margin: 24px 0 36px;
-    padding: 12px;
-  }
-
   &__shuffled-seed-words {
-    max-width: 496px;
+    max-width: 575px;
   }
 
   &__seed-word {
-    display: inline-block;
-    color: #5B5D67;
-    background-color: #E7E7E7;
+    display: inline-flex;
+    flex-flow: row nowrap;
+    align-items: center;
+    justify-content: center;
     padding: 8px 18px;
-    min-width: 64px;
+    width: 128px;
+    height: 41px;
     margin: 4px;
     text-align: center;
+    border-radius: 4px;
+    cursor: move;
+
+    &--shuffled {
+      cursor: pointer;
+      margin: 6px;
+    }
 
     &--selected {
-      background-color: #85D1CC;
       color: $white;
     }
 
-    &--shuffled {
-      cursor: pointer;
-      margin: 6px;
+    &--dragging {
+      margin: 0;
+    }
+
+    &--empty {
+      background-color: transparent;
+      border-color: transparent;
+      cursor: default;
+
+      &:hover,
+      &:active {
+        background-color: transparent;
+        border-color: transparent;
+        cursor: default;
+        box-shadow: none !important;
+      }
+    }
+
+    &--hidden {
+      display: none !important;
+    }
+
+    &--drop-hover {
+      background-color: transparent;
+      border-color: transparent;
+      color: transparent;
     }
 
     @media screen and (max-width: 575px) {
@@ -42,7 +63,37 @@
     }
   }
 
-  button {
-    margin-top: 0xp;
+  &__selected-seed-words {
+    display: flex;
+    flex-flow: row wrap;
+    min-height: 161px;
+    max-width: 575px;
+    border: 1px solid #CDCDCD;
+    border-radius: 6px;
+    background-color: $white;
+    margin: 24px 0 36px;
+    padding: 12px;
+
+    &__pending-seed {
+      display: none;
+    }
+
+    &__selected-seed {
+      display: inline-flex;
+
+      &:hover {
+        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.25);
+      }
+    }
+
+    &--dragging {
+      .confirm-seed-phrase__selected-seed-words__pending-seed {
+        display: inline-flex;
+      }
+
+      .confirm-seed-phrase__selected-seed-words__selected-seed {
+        display: none;
+      }
+    }
   }
 }
diff --git a/ui/app/pages/first-time-flow/seed-phrase/seed-phrase.component.js b/ui/app/pages/first-time-flow/seed-phrase/seed-phrase.component.js
index 9a9f84049..0b19af18c 100644
--- a/ui/app/pages/first-time-flow/seed-phrase/seed-phrase.component.js
+++ b/ui/app/pages/first-time-flow/seed-phrase/seed-phrase.component.js
@@ -8,6 +8,8 @@ import {
   INITIALIZE_CONFIRM_SEED_PHRASE_ROUTE,
   DEFAULT_ROUTE,
 } from '../../../helpers/constants/routes'
+import HTML5Backend from 'react-dnd-html5-backend'
+import {DragDropContextProvider} from 'react-dnd'
 
 export default class SeedPhrase extends PureComponent {
   static propTypes = {
@@ -28,43 +30,45 @@ export default class SeedPhrase extends PureComponent {
     const { seedPhrase } = this.props
 
     return (
-      <div className="first-time-flow__wrapper">
-        <div className="app-header__logo-container">
-          <img
-            className="app-header__metafox-logo app-header__metafox-logo--horizontal"
-            src="/images/logo/metamask-logo-horizontal.svg"
-            height={30}
-          />
-          <img
-            className="app-header__metafox-logo app-header__metafox-logo--icon"
-            src="/images/logo/metamask-fox.svg"
-            height={42}
-            width={42}
-          />
+      <DragDropContextProvider backend={HTML5Backend}>
+        <div className="first-time-flow__wrapper">
+          <div className="app-header__logo-container">
+            <img
+              className="app-header__metafox-logo app-header__metafox-logo--horizontal"
+              src="/images/logo/metamask-logo-horizontal.svg"
+              height={30}
+            />
+            <img
+              className="app-header__metafox-logo app-header__metafox-logo--icon"
+              src="/images/logo/metamask-fox.svg"
+              height={42}
+              width={42}
+            />
+          </div>
+          <Switch>
+            <Route
+              exact
+              path={INITIALIZE_CONFIRM_SEED_PHRASE_ROUTE}
+              render={props => (
+                <ConfirmSeedPhrase
+                  { ...props }
+                  seedPhrase={seedPhrase}
+                />
+              )}
+            />
+            <Route
+              exact
+              path={INITIALIZE_SEED_PHRASE_ROUTE}
+              render={props => (
+                <RevealSeedPhrase
+                  { ...props }
+                  seedPhrase={seedPhrase}
+                />
+              )}
+            />
+          </Switch>
         </div>
-        <Switch>
-          <Route
-            exact
-            path={INITIALIZE_CONFIRM_SEED_PHRASE_ROUTE}
-            render={props => (
-              <ConfirmSeedPhrase
-                { ...props }
-                seedPhrase={seedPhrase}
-              />
-            )}
-          />
-          <Route
-            exact
-            path={INITIALIZE_SEED_PHRASE_ROUTE}
-            render={props => (
-              <RevealSeedPhrase
-                { ...props }
-                seedPhrase={seedPhrase}
-              />
-            )}
-          />
-        </Switch>
-      </div>
+      </DragDropContextProvider>
     )
   }
 }
diff --git a/ui/app/pages/first-time-flow/seed-phrase/tests/confirm-seed-phrase-component.test.js b/ui/app/pages/first-time-flow/seed-phrase/tests/confirm-seed-phrase-component.test.js
new file mode 100644
index 000000000..8339a6f6f
--- /dev/null
+++ b/ui/app/pages/first-time-flow/seed-phrase/tests/confirm-seed-phrase-component.test.js
@@ -0,0 +1,169 @@
+import React from 'react'
+import assert from 'assert'
+import { shallow } from 'enzyme'
+import sinon from 'sinon'
+import ConfirmSeedPhrase from '../confirm-seed-phrase/confirm-seed-phrase.component'
+
+function shallowRender (props = {}, context = {}) {
+  return shallow(
+    <ConfirmSeedPhrase {...props} />,
+    {
+      context: {
+        t: str => str + '_t',
+        ...context,
+      },
+    }
+  )
+}
+
+describe('ConfirmSeedPhrase Component', () => {
+  it('should render correctly', () => {
+    const root = shallowRender({
+      seedPhrase: '鼠 牛 虎 兔 龍 蛇 馬 羊 猴 雞 狗 豬',
+    })
+
+    assert.equal(
+      root.find('.confirm-seed-phrase__seed-word--shuffled').length,
+      12,
+      'should render 12 seed phrases'
+    )
+  })
+
+  it('should add/remove selected on click', () => {
+    const metricsEventSpy = sinon.spy()
+    const pushSpy = sinon.spy()
+    const root = shallowRender(
+      {
+        seedPhrase: '鼠 牛 虎 兔 龍 蛇 馬 羊 猴 雞 狗 豬',
+        history: { push: pushSpy },
+      },
+      {
+        metricsEvent: metricsEventSpy,
+      }
+    )
+
+    const seeds = root.find('.confirm-seed-phrase__seed-word--shuffled')
+
+    // Click on 3 seeds to add to selected
+    seeds.at(0).simulate('click')
+    seeds.at(1).simulate('click')
+    seeds.at(2).simulate('click')
+
+    assert.deepEqual(
+      root.state().selectedSeedIndices,
+      [0, 1, 2],
+      'should add seed phrase to selected on click',
+    )
+
+    // Click on a selected seed to remove
+    root.state()
+    root.update()
+    root.state()
+    root.find('.confirm-seed-phrase__seed-word--shuffled').at(1).simulate('click')
+    assert.deepEqual(
+      root.state().selectedSeedIndices,
+      [0, 2],
+      'should remove seed phrase from selected when click again',
+    )
+  })
+
+  it('should render correctly on hover', () => {
+    const metricsEventSpy = sinon.spy()
+    const pushSpy = sinon.spy()
+    const root = shallowRender(
+      {
+        seedPhrase: '鼠 牛 虎 兔 龍 蛇 馬 羊 猴 雞 狗 豬',
+        history: { push: pushSpy },
+      },
+      {
+        metricsEvent: metricsEventSpy,
+      }
+    )
+
+    const seeds = root.find('.confirm-seed-phrase__seed-word--shuffled')
+
+    // Click on 3 seeds to add to selected
+    seeds.at(0).simulate('click')
+    seeds.at(1).simulate('click')
+    seeds.at(2).simulate('click')
+
+    // Dragging Seed # 2 to 0 placeth
+    root.instance().setDraggingSeedIndex(2)
+    root.instance().setHoveringIndex(0)
+
+    root.update()
+
+    const pendingSeeds = root.find('.confirm-seed-phrase__selected-seed-words__pending-seed')
+
+    assert.equal(pendingSeeds.at(0).props().seedIndex, 2)
+    assert.equal(pendingSeeds.at(1).props().seedIndex, 0)
+    assert.equal(pendingSeeds.at(2).props().seedIndex, 1)
+  })
+
+  it('should insert seed in place on drop', () => {
+    const metricsEventSpy = sinon.spy()
+    const pushSpy = sinon.spy()
+    const root = shallowRender(
+      {
+        seedPhrase: '鼠 牛 虎 兔 龍 蛇 馬 羊 猴 雞 狗 豬',
+        history: { push: pushSpy },
+      },
+      {
+        metricsEvent: metricsEventSpy,
+      }
+    )
+
+    const seeds = root.find('.confirm-seed-phrase__seed-word--shuffled')
+
+    // Click on 3 seeds to add to selected
+    seeds.at(0).simulate('click')
+    seeds.at(1).simulate('click')
+    seeds.at(2).simulate('click')
+
+    // Drop Seed # 2 to 0 placeth
+    root.instance().setDraggingSeedIndex(2)
+    root.instance().setHoveringIndex(0)
+    root.instance().onDrop(0)
+
+    root.update()
+
+    assert.deepEqual(root.state().selectedSeedIndices, [2, 0, 1])
+    assert.deepEqual(root.state().pendingSeedIndices, [2, 0, 1])
+  })
+
+  it('should submit correctly', () => {
+    const originalSeed = ['鼠', '牛', '虎', '兔', '龍', '蛇', '馬', '羊', '猴', '雞', '狗', '豬']
+    const metricsEventSpy = sinon.spy()
+    const pushSpy = sinon.spy()
+    const root = shallowRender(
+      {
+        seedPhrase: '鼠 牛 虎 兔 龍 蛇 馬 羊 猴 雞 狗 豬',
+        history: { push: pushSpy },
+      },
+      {
+        metricsEvent: metricsEventSpy,
+      }
+    )
+
+    const shuffled = root.state().shuffledSeedWords
+    const seeds = root.find('.confirm-seed-phrase__seed-word--shuffled')
+
+
+    originalSeed.forEach(seed => {
+      const seedIndex = shuffled.findIndex(s => s === seed)
+      seeds.at(seedIndex).simulate('click')
+    })
+
+    root.update()
+
+    root.find('.first-time-flow__button').simulate('click')
+    assert.deepEqual(metricsEventSpy.args[0][0], {
+      eventOpts: {
+        category: 'Onboarding',
+        action: 'Seed Phrase Setup',
+        name: 'Verify Complete',
+      },
+    })
+    assert.equal(pushSpy.args[0][0], '/initialize/end-of-flow')
+  })
+})