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// Copyright 2015 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 core

import (
    "encoding/json"
    "math/big"
    "os"
    "testing"

    "github.com/ethereum/go-ethereum/common"
)

type diffTest struct {
    ParentTimestamp    uint64
    ParentDifficulty   *big.Int
    CurrentTimestamp   uint64
    CurrentBlocknumber *big.Int
    CurrentDifficulty  *big.Int
}

func (d *diffTest) UnmarshalJSON(b []byte) (err error) {
    var ext struct {
        ParentTimestamp    string
        ParentDifficulty   string
        CurrentTimestamp   string
        CurrentBlocknumber string
        CurrentDifficulty  string
    }
    if err := json.Unmarshal(b, &ext); err != nil {
        return err
    }

    d.ParentTimestamp = common.String2Big(ext.ParentTimestamp).Uint64()
    d.ParentDifficulty = common.String2Big(ext.ParentDifficulty)
    d.CurrentTimestamp = common.String2Big(ext.CurrentTimestamp).Uint64()
    d.CurrentBlocknumber = common.String2Big(ext.CurrentBlocknumber)
    d.CurrentDifficulty = common.String2Big(ext.CurrentDifficulty)

    return nil
}

func TestDifficulty(t *testing.T) {
    file, err := os.Open("../tests/files/BasicTests/difficulty.json")
    if err != nil {
        t.Fatal(err)
    }
    defer file.Close()

    tests := make(map[string]diffTest)
    err = json.NewDecoder(file).Decode(&tests)
    if err != nil {
        t.Fatal(err)
    }

    for name, test := range tests {
        number := new(big.Int).Sub(test.CurrentBlocknumber, big.NewInt(1))
        diff := CalcDifficulty(test.CurrentTimestamp, test.ParentTimestamp, number, test.ParentDifficulty)
        if diff.Cmp(test.CurrentDifficulty) != 0 {
            t.Error(name, "failed. Expected", test.CurrentDifficulty, "and calculated", diff)
        }
    }
}