package bytecode

import (
	"encoding/hex"
	"testing"

	"github.com/stretchr/testify/require"
)

func fromHexadecimalStringToBytes(str string) []byte {
	data, _ := hex.DecodeString(str)
	return data
}

type ExtractCallTest struct {
	name        string
	script      string
	bytecodeStr string
	expected    []SyscallParameters
	wantErr     bool
}

var tests = []ExtractCallTest{
	{
		name: "valid bytecode 1",
		script: "PUSHINT16 3600\n" +
			"PUSHINT32 315360000\n" +
			"PUSHINT16 600\n" +
			"PUSHINT16 3600\n" +
			"PUSHDATA1 6f70734066726f737466732e696e666f\n" +
			"PUSHDATA1 0x56c989e76f9a2ca05bb5caa6c96f524d905accd8\n" +
			"PUSHDATA1 frostfs\n" +
			"PUSH7\n" +
			"PACK\n" +
			"PUSH15\n" +
			"PUSHDATA1 register\n" +
			"PUSHDATA1 0x76c10d0295b7e76a5674c55d702f04ce280e745e\n" +
			"SYSCALL System.Contract.Call\n" +
			"ASSERT",
		bytecodeStr: "0c106f70734066726f737466" +
			"732e696e666f0c14d8cc5a90" +
			"4d526fc9a6cab55ba02c9a6f" +
			"e789c9560c0766726f737466" +
			"7317c01f0c08726567697374" +
			"65720c145e740e28ce042f70" +
			"5dc574566ae7b795020dc176" +
			"41627d5b5239",
		expected: []SyscallParameters{
			{
				Contract: "NUXPjTBsLY6fgVPfmBf8uLk9QBVqgKKkdB",
				Method:   "register",
			},
		},
		wantErr: false,
	},
	{
		name: "valid bytecode 2",
		script: "PUSHNULL\n" +
			"PUSHINT32 100000000\n" +
			"PUSHDATA1 0x0945e5d5d2dae45c095a4f66f4d48ccba1e512db\n" +
			"PUSHDATA1 0x56c989e76f9a2ca05bb5caa6c96f524d905accd8\n" +
			"PUSH4\n" +
			"PACK\n" +
			"PUSH15\n" +
			"PUSHDATA1 transfer\n" +
			"PUSHDATA1 0xef4073a0f2b305a38ec4050e4d3d28bc40ea63f5\n" +
			"SYSCALL System.Contract.Call\n" +
			"ASSERT",
		bytecodeStr: "0b0200e1f5050c14db12e5a1" +
			"cb8cd4f4664f5a095ce4dad2" +
			"d5e545090c14d8cc5a904d52" +
			"6fc9a6cab55ba02c9a6fe789" +
			"c95614c01f0c087472616e73" +
			"6665720c14f563ea40bc283d" +
			"4d0e05c48ea305b3f2a07340" +
			"ef41627d5b5239",
		expected: []SyscallParameters{
			{
				Contract: "NiHURyS83nX2mpxtA7xq84cGxVbHojj5Wc",
				Method:   "transfer",
			},
		},
		wantErr: false,
	},
	{
		name: "multiple calls",
		script: "PUSH1\n" +
			"PUSH1\n" +
			"PACK\n" +
			"PUSH3\n" +
			"PUSHDATA1 setRegisterPrice\n" +
			"PUSHDATA1 0xef4073a0f2b305a38ec4050e4d3d28bc40ea63f5\n" +
			"SYSCALL System.Contract.Call\n" +
			"PUSHDATA1 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2\n" +
			"PUSH1\n" +
			"PACK\n" +
			"PUSH3\n" +
			"PUSHDATA1 registerCandidate\n" +
			"PUSHDATA1 0xef4073a0f2b305a38ec4050e4d3d28bc40ea63f5\n" +
			"SYSCALL System.Contract.Call\n" +
			"ASSERT\n" +
			"PUSHINT64 100000000000\n" +
			"PUSH1\n" +
			"PACK\n" +
			"PUSH3\n" +
			"PUSHDATA1 setRegisterPrice\n" +
			"PUSHDATA1 0xef4073a0f2b305a38ec4050e4d3d28bc40ea63f5\n" +
			"SYSCALL System.Contract.Call",
		bytecodeStr: "1111c0130c10736574526567" +
			"697374657250726963650c14" +
			"f563ea40bc283d4d0e05c48e" +
			"a305b3f2a07340ef41627d5b" +
			"520c2102b3622bf4017bdfe3" +
			"17c58aed5f4c753f206b7db8" +
			"96046fa7d774bbc4bf7f8dc2" +
			"11c0130c1172656769737465" +
			"7243616e6469646174650c14" +
			"f563ea40bc283d4d0e05c48e" +
			"a305b3f2a07340ef41627d5b" +
			"52390300e876481700000011" +
			"c0130c107365745265676973" +
			"74657250726963650c14f563" +
			"ea40bc283d4d0e05c48ea305" +
			"b3f2a07340ef41627d5b52",
		expected: []SyscallParameters{
			{
				Contract: "NiHURyS83nX2mpxtA7xq84cGxVbHojj5Wc",
				Method:   "setRegisterPrice",
			},
			{
				Contract: "NiHURyS83nX2mpxtA7xq84cGxVbHojj5Wc",
				Method:   "registerCandidate",
			},
			{
				Contract: "NiHURyS83nX2mpxtA7xq84cGxVbHojj5Wc",
				Method:   "setRegisterPrice",
			},
		},
	},
	{
		name: "invalid contract address len",
		script: "PUSH1\n" +
			"PUSH1\n" +
			"PACK\n" +
			"PUSH3\n" +
			"PUSHDATA1 setRegisterPrice\n" +
			"PUSHDATA1 a1ef4073a0f2b305a38ec4050e4d3d28bc40ea63f5\n" +
			"SYSCALL System.Contract.Call",
		bytecodeStr: "1111c0130c1073657452656" +
			"7697374657250726963650c" +
			"14f563ea40bc283d4d0e05c" +
			"48ea305b3f2a07340efa141" +
			"627d5b52",
		expected: nil,
		wantErr:  true,
	},
}

func TestExtractCalls(t *testing.T) {
	for _, tt := range tests {
		bytecode := fromHexadecimalStringToBytes(tt.bytecodeStr)
		syscallParams, err := ExtractCalls(bytecode)
		if tt.wantErr {
			require.Error(t, err)
		}
		require.Equal(t, tt.expected, syscallParams)
	}
}