package smartcontract

import (
	"flag"
	"io/ioutil"
	"os"
	"strings"
	"testing"

	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
	"github.com/nspcc-dev/neo-go/pkg/util"
	"github.com/stretchr/testify/require"
	"github.com/urfave/cli"
)

func TestInitSmartContract(t *testing.T) {
	d, err := ioutil.TempDir("./", "")
	require.NoError(t, err)
	os.Chdir(d)
	defer func() {
		os.Chdir("..")
		os.RemoveAll(d)
	}()
	contractName := "testContract"

	set := flag.NewFlagSet("flagSet", flag.ExitOnError)
	set.String("name", contractName, "")
	ctx := cli.NewContext(cli.NewApp(), set, nil)
	require.NoError(t, initSmartContract(ctx))
	dirInfo, err := os.Stat(contractName)
	require.NoError(t, err)
	require.True(t, dirInfo.IsDir())
	files, err := ioutil.ReadDir(contractName)
	require.NoError(t, err)
	require.Equal(t, 2, len(files))
	require.Equal(t, "main.go", files[0].Name())
	require.Equal(t, "neo-go.yml", files[1].Name())
	main, err := ioutil.ReadFile(contractName + "/" + files[0].Name())
	require.NoError(t, err)
	require.Equal(t,
		`package `+contractName+`

import "github.com/nspcc-dev/neo-go/pkg/interop/runtime"

var notificationName string

// init initializes notificationName before calling any other smart-contract method
func init() {
	notificationName = "Hello world!"
}

// RuntimeNotify sends runtime notification with "Hello world!" name
func RuntimeNotify(args []interface{}) {
    runtime.Notify(notificationName, args)
}`, string(main))

	manifest, err := ioutil.ReadFile(contractName + "/" + files[1].Name())
	require.NoError(t, err)
	require.Equal(t,
		`name: testContract
safemethods: []
supportedstandards: []
events:
- name: Hello world!
  parameters:
  - name: args
    type: Array
`, string(manifest))
}

func TestParseCosigner(t *testing.T) {
	acc := util.Uint160{1, 3, 5, 7}
	testCases := map[string]transaction.Signer{
		acc.StringLE(): {
			Account: acc,
			Scopes:  transaction.Global,
		},
		"0x" + acc.StringLE(): {
			Account: acc,
			Scopes:  transaction.Global,
		},
		acc.StringLE() + ":Global": {
			Account: acc,
			Scopes:  transaction.Global,
		},
		acc.StringLE() + ":CalledByEntry": {
			Account: acc,
			Scopes:  transaction.CalledByEntry,
		},
		acc.StringLE() + ":None": {
			Account: acc,
			Scopes:  transaction.None,
		},
		acc.StringLE() + ":CalledByEntry,CustomContracts": {
			Account: acc,
			Scopes:  transaction.CalledByEntry | transaction.CustomContracts,
		},
	}
	for s, expected := range testCases {
		actual, err := parseCosigner(s)
		require.NoError(t, err)
		require.Equal(t, expected, actual)
	}
	errorCases := []string{
		acc.StringLE() + "0",
		acc.StringLE() + ":Unknown",
		acc.StringLE() + ":Global,CustomContracts",
		acc.StringLE() + ":Global,None",
	}
	for _, s := range errorCases {
		_, err := parseCosigner(s)
		require.Error(t, err)
	}
}

func TestParseParams_CalledFromItself(t *testing.T) {
	testCases := map[string]struct {
		WordsRead int
		Value     []smartcontract.Parameter
	}{
		"]": {
			WordsRead: 1,
			Value:     []smartcontract.Parameter{},
		},
		"[ [ ] ] ]": {
			WordsRead: 5,
			Value: []smartcontract.Parameter{
				{
					Type: smartcontract.ArrayType,
					Value: []smartcontract.Parameter{
						{
							Type:  smartcontract.ArrayType,
							Value: []smartcontract.Parameter{},
						},
					},
				},
			},
		},
		"a b c ]": {
			WordsRead: 4,
			Value: []smartcontract.Parameter{
				{
					Type:  smartcontract.StringType,
					Value: "a",
				},
				{
					Type:  smartcontract.StringType,
					Value: "b",
				},
				{
					Type:  smartcontract.StringType,
					Value: "c",
				},
			},
		},
		"a [ b [ [ c d ] e ] ] f ] extra items": {
			WordsRead: 13, // the method should return right after the last bracket, as calledFromMain == false
			Value: []smartcontract.Parameter{
				{
					Type:  smartcontract.StringType,
					Value: "a",
				},
				{
					Type: smartcontract.ArrayType,
					Value: []smartcontract.Parameter{
						{
							Type:  smartcontract.StringType,
							Value: "b",
						},
						{
							Type: smartcontract.ArrayType,
							Value: []smartcontract.Parameter{
								{
									Type: smartcontract.ArrayType,
									Value: []smartcontract.Parameter{
										{
											Type:  smartcontract.StringType,
											Value: "c",
										},
										{
											Type:  smartcontract.StringType,
											Value: "d",
										},
									},
								},
								{
									Type:  smartcontract.StringType,
									Value: "e",
								},
							},
						},
					},
				},
				{
					Type:  smartcontract.StringType,
					Value: "f",
				},
			},
		},
	}

	for str, expected := range testCases {
		input := strings.Split(str, " ")
		offset, actual, err := parseParams(input, false)
		require.NoError(t, err)
		require.Equal(t, expected.WordsRead, offset)
		require.Equal(t, expected.Value, actual)
	}

	errorCases := []string{
		"[ ]",
		"[ a b [ c ] d ]",
		"[ ] --",
		"--",
		"not-int:integer ]",
	}

	for _, str := range errorCases {
		input := strings.Split(str, " ")
		_, _, err := parseParams(input, false)
		require.Error(t, err)
	}
}

func TestParseParams_CalledFromOutside(t *testing.T) {
	testCases := map[string]struct {
		WordsRead  int
		Parameters []smartcontract.Parameter
	}{
		"-- cosigner1": {
			WordsRead:  1, // the `--` only
			Parameters: []smartcontract.Parameter{},
		},
		"a b c": {
			WordsRead: 3,
			Parameters: []smartcontract.Parameter{
				{
					Type:  smartcontract.StringType,
					Value: "a",
				},
				{
					Type:  smartcontract.StringType,
					Value: "b",
				},
				{
					Type:  smartcontract.StringType,
					Value: "c",
				},
			},
		},
		"a b c -- cosigner1": {
			WordsRead: 4,
			Parameters: []smartcontract.Parameter{
				{
					Type:  smartcontract.StringType,
					Value: "a",
				},
				{
					Type:  smartcontract.StringType,
					Value: "b",
				},
				{
					Type:  smartcontract.StringType,
					Value: "c",
				},
			},
		},
		"a [ b [ [ c d ] e ] ] f": {
			WordsRead: 12,
			Parameters: []smartcontract.Parameter{
				{
					Type:  smartcontract.StringType,
					Value: "a",
				},
				{
					Type: smartcontract.ArrayType,
					Value: []smartcontract.Parameter{
						{
							Type:  smartcontract.StringType,
							Value: "b",
						},
						{
							Type: smartcontract.ArrayType,
							Value: []smartcontract.Parameter{
								{
									Type: smartcontract.ArrayType,
									Value: []smartcontract.Parameter{
										{
											Type:  smartcontract.StringType,
											Value: "c",
										},
										{
											Type:  smartcontract.StringType,
											Value: "d",
										},
									},
								},
								{
									Type:  smartcontract.StringType,
									Value: "e",
								},
							},
						},
					},
				},
				{
					Type:  smartcontract.StringType,
					Value: "f",
				},
			},
		},
		"a [ b ] -- cosigner1 cosigner2": {
			WordsRead: 5,
			Parameters: []smartcontract.Parameter{
				{
					Type:  smartcontract.StringType,
					Value: "a",
				},
				{
					Type: smartcontract.ArrayType,
					Value: []smartcontract.Parameter{
						{
							Type:  smartcontract.StringType,
							Value: "b",
						},
					},
				},
			},
		},
		"a [ b ]": {
			WordsRead: 4,
			Parameters: []smartcontract.Parameter{
				{
					Type:  smartcontract.StringType,
					Value: "a",
				},
				{
					Type: smartcontract.ArrayType,
					Value: []smartcontract.Parameter{
						{
							Type:  smartcontract.StringType,
							Value: "b",
						},
					},
				},
			},
		},
		"a [ b ] [ [ c ] ] [ [ [ d ] ] ]": {
			WordsRead: 16,
			Parameters: []smartcontract.Parameter{
				{
					Type:  smartcontract.StringType,
					Value: "a",
				},
				{
					Type: smartcontract.ArrayType,
					Value: []smartcontract.Parameter{
						{
							Type:  smartcontract.StringType,
							Value: "b",
						},
					},
				},
				{
					Type: smartcontract.ArrayType,
					Value: []smartcontract.Parameter{
						{
							Type: smartcontract.ArrayType,
							Value: []smartcontract.Parameter{
								{
									Type:  smartcontract.StringType,
									Value: "c",
								},
							},
						},
					},
				},
				{
					Type: smartcontract.ArrayType,
					Value: []smartcontract.Parameter{
						{
							Type: smartcontract.ArrayType,
							Value: []smartcontract.Parameter{
								{
									Type: smartcontract.ArrayType,
									Value: []smartcontract.Parameter{
										{
											Type:  smartcontract.StringType,
											Value: "d",
										},
									},
								},
							},
						},
					},
				},
			},
		},
	}
	for str, expected := range testCases {
		input := strings.Split(str, " ")
		offset, arr, err := parseParams(input, true)
		require.NoError(t, err)
		require.Equal(t, expected.WordsRead, offset)
		require.Equal(t, expected.Parameters, arr)
	}

	errorCases := []string{
		"[",
		"]",
		"[ [ ]",
		"[ [ ] --",
		"[ -- ]",
	}
	for _, str := range errorCases {
		input := strings.Split(str, " ")
		_, _, err := parseParams(input, true)
		require.Error(t, err)
	}
}