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// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package tracers

import (
    "encoding/json"
    "io/ioutil"
    "math/big"
    "path/filepath"
    "reflect"
    "strings"
    "testing"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/common/hexutil"
    "github.com/ethereum/go-ethereum/common/math"
    "github.com/ethereum/go-ethereum/core"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/core/vm"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/rlp"
    "github.com/ethereum/go-ethereum/tests"
)

// To generate a new callTracer test, copy paste the makeTest method below into
// a Geth console and call it with a transaction hash you which to export.

/*
// makeTest generates a callTracer test by running a prestate reassembled and a
// call trace run, assembling all the gathered information into a test case.
var makeTest = function(tx, rewind) {
  // Generate the genesis block from the block, transaction and prestate data
  var block   = eth.getBlock(eth.getTransaction(tx).blockHash);
  var genesis = eth.getBlock(block.parentHash);

  delete genesis.gasUsed;
  delete genesis.logsBloom;
  delete genesis.parentHash;
  delete genesis.receiptsRoot;
  delete genesis.sha3Uncles;
  delete genesis.size;
  delete genesis.transactions;
  delete genesis.transactionsRoot;
  delete genesis.uncles;

  genesis.gasLimit  = genesis.gasLimit.toString();
  genesis.number    = genesis.number.toString();
  genesis.timestamp = genesis.timestamp.toString();

  genesis.alloc = debug.traceTransaction(tx, {tracer: "prestateTracer", rewind: rewind});
  for (var key in genesis.alloc) {
    genesis.alloc[key].nonce = genesis.alloc[key].nonce.toString();
  }
  genesis.config = admin.nodeInfo.protocols.eth.config;

  // Generate the call trace and produce the test input
  var result = debug.traceTransaction(tx, {tracer: "callTracer", rewind: rewind});
  delete result.time;

  console.log(JSON.stringify({
    genesis: genesis,
    context: {
      number:     block.number.toString(),
      difficulty: block.difficulty,
      timestamp:  block.timestamp.toString(),
      gasLimit:   block.gasLimit.toString(),
      miner:      block.miner,
    },
    input:  eth.getRawTransaction(tx),
    result: result,
  }, null, 2));
}
*/

// callTrace is the result of a callTracer run.
type callTrace struct {
    Type    string          `json:"type"`
    From    common.Address  `json:"from"`
    To      common.Address  `json:"to"`
    Input   hexutil.Bytes   `json:"input"`
    Output  hexutil.Bytes   `json:"output"`
    Gas     *hexutil.Uint64 `json:"gas,omitempty"`
    GasUsed *hexutil.Uint64 `json:"gasUsed,omitempty"`
    Value   *hexutil.Big    `json:"value,omitempty"`
    Error   string          `json:"error,omitempty"`
    Calls   []callTrace     `json:"calls,omitempty"`
}

type callContext struct {
    Number     math.HexOrDecimal64   `json:"number"`
    Difficulty *math.HexOrDecimal256 `json:"difficulty"`
    Time       math.HexOrDecimal64   `json:"timestamp"`
    GasLimit   math.HexOrDecimal64   `json:"gasLimit"`
    Miner      common.Address        `json:"miner"`
}

// callTracerTest defines a single test to check the call tracer against.
type callTracerTest struct {
    Genesis *core.Genesis `json:"genesis"`
    Context *callContext  `json:"context"`
    Input   string        `json:"input"`
    Result  *callTrace    `json:"result"`
}

// Iterates over all the input-output datasets in the tracer test harness and
// runs the JavaScript tracers against them.
func TestCallTracer(t *testing.T) {
    files, err := ioutil.ReadDir("testdata")
    if err != nil {
        t.Fatalf("failed to retrieve tracer test suite: %v", err)
    }
    for _, file := range files {
        if !strings.HasPrefix(file.Name(), "call_tracer_") {
            continue
        }
        file := file // capture range variable
        t.Run(camel(strings.TrimSuffix(strings.TrimPrefix(file.Name(), "call_tracer_"), ".json")), func(t *testing.T) {
            t.Parallel()

            // Call tracer test found, read if from disk
            blob, err := ioutil.ReadFile(filepath.Join("testdata", file.Name()))
            if err != nil {
                t.Fatalf("failed to read testcase: %v", err)
            }
            test := new(callTracerTest)
            if err := json.Unmarshal(blob, test); err != nil {
                t.Fatalf("failed to parse testcase: %v", err)
            }
            // Configure a blockchain with the given prestate
            tx := new(types.Transaction)
            if err := rlp.DecodeBytes(common.FromHex(test.Input), tx); err != nil {
                t.Fatalf("failed to parse testcase input: %v", err)
            }
            signer := types.MakeSigner(test.Genesis.Config, new(big.Int).SetUint64(uint64(test.Context.Number)))
            origin, _ := signer.Sender(tx)

            context := vm.Context{
                CanTransfer: core.CanTransfer,
                Transfer:    core.Transfer,
                Origin:      origin,
                Coinbase:    test.Context.Miner,
                BlockNumber: new(big.Int).SetUint64(uint64(test.Context.Number)),
                Time:        new(big.Int).SetUint64(uint64(test.Context.Time)),
                Difficulty:  (*big.Int)(test.Context.Difficulty),
                GasLimit:    uint64(test.Context.GasLimit),
                GasPrice:    tx.GasPrice(),
            }
            db, _ := ethdb.NewMemDatabase()
            statedb := tests.MakePreState(db, test.Genesis.Alloc)

            // Create the tracer, the EVM environment and run it
            tracer, err := New("callTracer")
            if err != nil {
                t.Fatalf("failed to create call tracer: %v", err)
            }
            evm := vm.NewEVM(context, statedb, test.Genesis.Config, vm.Config{Debug: true, Tracer: tracer})

            msg, err := tx.AsMessage(signer)
            if err != nil {
                t.Fatalf("failed to prepare transaction for tracing: %v", err)
            }
            st := core.NewStateTransition(evm, msg, new(core.GasPool).AddGas(tx.Gas()))
            if _, _, _, err = st.TransitionDb(); err != nil {
                t.Fatalf("failed to execute transaction: %v", err)
            }
            // Retrieve the trace result and compare against the etalon
            res, err := tracer.GetResult()
            if err != nil {
                t.Fatalf("failed to retrieve trace result: %v", err)
            }
            ret := new(callTrace)
            if err := json.Unmarshal(res, ret); err != nil {
                t.Fatalf("failed to unmarshal trace result: %v", err)
            }
            if !reflect.DeepEqual(ret, test.Result) {
                t.Fatalf("trace mismatch: have %+v, want %+v", ret, test.Result)
            }
        })
    }
}