package compiler_test

import (
	"fmt"
	"math/big"
	"testing"
)

type convertTestCase struct {
	returnType string
	argValue   string
	result     interface{}
}

func getFunctionName(typ string) string {
	switch typ {
	case "bool":
		return "Bool"
	case "[]byte":
		return "Bytes"
	case "int":
		return "Integer"
	}
	panic("invalid type")
}

func TestConvert(t *testing.T) {
	srcTmpl := `package foo
	import "github.com/nspcc-dev/neo-go/pkg/interop/convert"
	func Main() %s {
		arg := %s
		return convert.To%s(arg)
	}`

	convertTestCases := []convertTestCase{
		{"bool", "true", true},
		{"bool", "false", false},
		{"bool", "12", true},
		{"bool", "0", false},
		{"bool", "[]byte{0, 1, 0}", true},
		{"bool", "[]byte{0}", true},
		{"bool", `""`, false},
		{"int", "true", big.NewInt(1)},
		{"int", "false", big.NewInt(0)},
		{"int", "12", big.NewInt(12)},
		{"int", "0", big.NewInt(0)},
		{"int", "[]byte{0, 1, 0}", big.NewInt(256)},
		{"int", "[]byte{0}", big.NewInt(0)},
		{"[]byte", "true", []byte{1}},
		{"[]byte", "false", []byte{0}},
		{"[]byte", "12", []byte{0x0C}},
		{"[]byte", "0", []byte{}},
		{"[]byte", "[]byte{0, 1, 0}", []byte{0, 1, 0}},
	}

	for _, tc := range convertTestCases {
		name := getFunctionName(tc.returnType)
		t.Run(tc.argValue+"->"+name, func(t *testing.T) {
			src := fmt.Sprintf(srcTmpl, tc.returnType, tc.argValue, name)
			eval(t, src, tc.result)
		})
	}
}

func TestTypeAssertion(t *testing.T) {
	src := `package foo
	func Main() int {
		a := []byte{1}
		var u interface{}
		u = a
		return u.(int)
	}`
	eval(t, src, big.NewInt(1))
}

func TestTypeConversion(t *testing.T) {
	src := `package foo
	type myInt int
	func Main() int32 {
		var a int32 = 41
		b := myInt(a)
		incMy := func(x myInt) myInt { return x + 1 }
		c := incMy(b)
		return int32(c)
	}`

	eval(t, src, big.NewInt(42))
}

func TestSelectorTypeConversion(t *testing.T) {
	src := `package foo
	import "github.com/nspcc-dev/neo-go/pkg/compiler/testdata/types"
	import "github.com/nspcc-dev/neo-go/pkg/interop/util"
	import "github.com/nspcc-dev/neo-go/pkg/interop"
	func Main() int {
		var a int
		if util.Equals(types.Buffer(nil), nil) {
			a += 1
		}

	    // Buffer != ByteArray
		if util.Equals(types.Buffer("\x12"), "\x12") {
			a += 10
		}

		tmp := []byte{0x23}
		if util.Equals(types.ByteString(tmp), "\x23") {
			a += 100
		}

		addr := "aaaaaaaaaaaaaaaaaaaa"
		buf := []byte(addr)
		if util.Equals(interop.Hash160(addr), interop.Hash160(buf)) {
			a += 1000
		}
		return a
	}`
	eval(t, src, big.NewInt(1101))
}

func TestTypeConversionString(t *testing.T) {
	src := `package foo
	type mystr string
	func Main() mystr {
		b := []byte{'l', 'a', 'm', 'a', 'o'}
		s := mystr(b)
		b[0] = 'u'
		return s
	}`
	eval(t, src, []byte("lamao"))
}