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// Copyright 2016 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.

package main

import (
    "io/ioutil"
    "os"
    "path/filepath"
    "testing"
)

var customGenesisTests = []struct {
    genesis string
    query   string
    result  string
}{
    // Plain genesis file without anything extra
    {
        genesis: `{
            "alloc"      : {},
            "coinbase"   : "0x0000000000000000000000000000000000000000",
            "difficulty" : "0x20000",
            "extraData"  : "",
            "gasLimit"   : "0x2fefd8",
            "nonce"      : "0x0000000000000042",
            "mixhash"    : "0x0000000000000000000000000000000000000000000000000000000000000000",
            "parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
            "timestamp"  : "0x00"
        }`,
        query:  "eth.getBlock(0).nonce",
        result: "0x0000000000000042",
    },
    // Genesis file with an empty chain configuration (ensure missing fields work)
    {
        genesis: `{
            "alloc"      : {},
            "coinbase"   : "0x0000000000000000000000000000000000000000",
            "difficulty" : "0x20000",
            "extraData"  : "",
            "gasLimit"   : "0x2fefd8",
            "nonce"      : "0x0000000000000042",
            "mixhash"    : "0x0000000000000000000000000000000000000000000000000000000000000000",
            "parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
            "timestamp"  : "0x00",
            "config"     : {}
        }`,
        query:  "eth.getBlock(0).nonce",
        result: "0x0000000000000042",
    },
    // Genesis file with specific chain configurations
    {
        genesis: `{
            "alloc"      : {},
            "coinbase"   : "0x0000000000000000000000000000000000000000",
            "difficulty" : "0x20000",
            "extraData"  : "",
            "gasLimit"   : "0x2fefd8",
            "nonce"      : "0x0000000000000042",
            "mixhash"    : "0x0000000000000000000000000000000000000000000000000000000000000000",
            "parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
            "timestamp"  : "0x00",
            "config"     : {
                "homesteadBlock" : 314,
                "daoForkBlock"   : 141,
                "daoForkSupport" : true
            },
        }`,
        query:  "eth.getBlock(0).nonce",
        result: "0x0000000000000042",
    },
}

// Tests that initializing Geth with a custom genesis block and chain definitions
// work properly.
func TestCustomGenesis(t *testing.T) {
    for i, tt := range customGenesisTests {
        // Create a temporary data directory to use and inspect later
        datadir := tmpdir(t)
        defer os.RemoveAll(datadir)

        // Initialize the data directory with the custom genesis block
        json := filepath.Join(datadir, "genesis.json")
        if err := ioutil.WriteFile(json, []byte(tt.genesis), 0600); err != nil {
            t.Fatalf("test %d: failed to write genesis file: %v", i, err)
        }
        runGeth(t, "--datadir", datadir, "init", json).cmd.Wait()

        // Query the custom genesis block
        geth := runGeth(t,
            "--datadir", datadir, "--maxpeers", "0", "--port", "0",
            "--nodiscover", "--nat", "none", "--ipcdisable",
            "--exec", tt.query, "console")
        geth.expectRegexp(tt.result)
        geth.expectExit()
    }
}