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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 (
    "fmt"
    "math/big"

    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/event"
    "github.com/ethereum/go-ethereum/params"
)

func ExampleGenerateChain() {
    params.MinGasLimit = big.NewInt(125000)      // Minimum the gas limit may ever be.
    params.GenesisGasLimit = big.NewInt(3141592) // Gas limit of the Genesis block.

    var (
        key1, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
        key2, _ = crypto.HexToECDSA("8a1f9a8f95be41cd7ccb6168179afb4504aefe388d1e14474d32c45c72ce7b7a")
        key3, _ = crypto.HexToECDSA("49a7b37aa6f6645917e7b807e9d1c00d4fa71f18343b0d4122a4d2df64dd6fee")
        addr1   = crypto.PubkeyToAddress(key1.PublicKey)
        addr2   = crypto.PubkeyToAddress(key2.PublicKey)
        addr3   = crypto.PubkeyToAddress(key3.PublicKey)
        db, _   = ethdb.NewMemDatabase()
    )

    // Ensure that key1 has some funds in the genesis block.
    genesis := WriteGenesisBlockForTesting(db, GenesisAccount{addr1, big.NewInt(1000000)})

    // This call generates a chain of 5 blocks. The function runs for
    // each block and adds different features to gen based on the
    // block index.
    chain, _ := GenerateChain(nil, genesis, db, 5, func(i int, gen *BlockGen) {
        switch i {
        case 0:
            // In block 1, addr1 sends addr2 some ether.
            tx, _ := types.NewTransaction(gen.TxNonce(addr1), addr2, big.NewInt(10000), params.TxGas, nil, nil).SignECDSA(key1)
            gen.AddTx(tx)
        case 1:
            // In block 2, addr1 sends some more ether to addr2.
            // addr2 passes it on to addr3.
            tx1, _ := types.NewTransaction(gen.TxNonce(addr1), addr2, big.NewInt(1000), params.TxGas, nil, nil).SignECDSA(key1)
            tx2, _ := types.NewTransaction(gen.TxNonce(addr2), addr3, big.NewInt(1000), params.TxGas, nil, nil).SignECDSA(key2)
            gen.AddTx(tx1)
            gen.AddTx(tx2)
        case 2:
            // Block 3 is empty but was mined by addr3.
            gen.SetCoinbase(addr3)
            gen.SetExtra([]byte("yeehaw"))
        case 3:
            // Block 4 includes blocks 2 and 3 as uncle headers (with modified extra data).
            b2 := gen.PrevBlock(1).Header()
            b2.Extra = []byte("foo")
            gen.AddUncle(b2)
            b3 := gen.PrevBlock(2).Header()
            b3.Extra = []byte("foo")
            gen.AddUncle(b3)
        }
    })

    // Import the chain. This runs all block validation rules.
    evmux := &event.TypeMux{}
    blockchain, _ := NewBlockChain(db, MakeChainConfig(), FakePow{}, evmux)
    if i, err := blockchain.InsertChain(chain); err != nil {
        fmt.Printf("insert error (block %d): %v\n", chain[i].NumberU64(), err)
        return
    }

    state, _ := blockchain.State()
    fmt.Printf("last block: #%d\n", blockchain.CurrentBlock().Number())
    fmt.Println("balance of addr1:", state.GetBalance(addr1))
    fmt.Println("balance of addr2:", state.GetBalance(addr2))
    fmt.Println("balance of addr3:", state.GetBalance(addr3))
    // Output:
    // last block: #5
    // balance of addr1: 989000
    // balance of addr2: 10000
    // balance of addr3: 19687500000000001000
}