package tape

// import "fmt"
import "slices"
// import "errors"
import "testing"
import "math/rand"

func TestI8Array(test *testing.T) {
	var buffer [64]byte
	_, err := EncodeI8Array[uint8](buffer[:], []uint8 { 0, 4, 50, 19 })
	if !errIs(err, ErrWrongBufferLength, "encoding []int8: wrong buffer length") { test.Fatal(err) }
	_, err = EncodeI8Array[uint8](buffer[:0], []uint8 { 0, 4, 50, 19 })
	if !errIs(err, ErrWrongBufferLength, "encoding []int8: wrong buffer length") { test.Fatal(err) }
	_, _, err = DecodeI8Array[uint8](buffer[:])
	if err != nil { test.Fatal(err) }
	_, _, err = DecodeI8Array[uint8](buffer[:0])
	if err != nil { test.Fatal(err) }
	
	for _ = range largeNumberNTestRounds {
		array := randInts[uint8](rand.Intn(16))
		length, _ := I8ArraySize(array)
		if length != len(array) { test.Fatalf("%d != %d", length, len(array)) }
		_, err := EncodeI8Array[uint8](buffer[:length], array)
		if err != nil { test.Fatal(err) }
		decoded, _, err := DecodeI8Array[uint8](buffer[:length])
		if err != nil { test.Fatal(err) }
		if !slices.Equal(decoded, array) {
			test.Fatalf("%v != %v", decoded, array)
		}
	}
}

func TestI16Array(test *testing.T) {
	var buffer [128]byte
	_, err := EncodeI16Array[uint16](buffer[:], []uint16 { 0, 4, 50, 19 })
	if !errIs(err, ErrWrongBufferLength, "encoding []int16: wrong buffer length") { test.Fatal(err) }
	_, err = EncodeI16Array[uint16](buffer[:0], []uint16 { 0, 4, 50, 19 })
	if !errIs(err, ErrWrongBufferLength, "encoding []int16: wrong buffer length") { test.Fatal(err) }
	_, _, err = DecodeI16Array[uint16](buffer[:])
	if err != nil { test.Fatal(err) }
	_, _, err = DecodeI16Array[uint16](buffer[:0])
	if err != nil { test.Fatal(err) }
	
	for _ = range largeNumberNTestRounds {
		array := randInts[uint16](rand.Intn(16))
		length, _ := I16ArraySize(array)
		if length != 2 * len(array) { test.Fatalf("%d != %d", length, 2 * len(array)) }
		_, err := EncodeI16Array[uint16](buffer[:length], array)
		if err != nil { test.Fatal(err) }
		decoded, _, err := DecodeI16Array[uint16](buffer[:length])
		if err != nil { test.Fatal(err) }
		if !slices.Equal(decoded, array) {
			test.Fatalf("%v != %v", decoded, array)
		}
	}
}

func TestI32Array(test *testing.T) {
	var buffer [256]byte
	_, err := EncodeI32Array[uint32](buffer[:], []uint32 { 0, 4, 50, 19 })
	if !errIs(err, ErrWrongBufferLength, "encoding []int32: wrong buffer length") { test.Fatal(err) }
	_, err = EncodeI32Array[uint32](buffer[:0], []uint32 { 0, 4, 50, 19 })
	if !errIs(err, ErrWrongBufferLength, "encoding []int32: wrong buffer length") { test.Fatal(err) }
	_, _, err = DecodeI32Array[uint32](buffer[:])
	if err != nil { test.Fatal(err) }
	_, _, err = DecodeI32Array[uint32](buffer[:0])
	if err != nil { test.Fatal(err) }
	
	for _ = range largeNumberNTestRounds {
		array := randInts[uint32](rand.Intn(16))
		length, _ := I32ArraySize(array)
		if length != 4 * len(array) { test.Fatalf("%d != %d", length, 4 * len(array)) }
		_, err := EncodeI32Array[uint32](buffer[:length], array)
		if err != nil { test.Fatal(err) }
		decoded, _, err := DecodeI32Array[uint32](buffer[:length])
		if err != nil { test.Fatal(err) }
		if !slices.Equal(decoded, array) {
			test.Fatalf("%v != %v", decoded, array)
		}
	}
}

func TestI64Array(test *testing.T) {
	var buffer [512]byte
	_, err := EncodeI64Array[uint64](buffer[:], []uint64 { 0, 4, 50, 19 })
	if !errIs(err, ErrWrongBufferLength, "encoding []int64: wrong buffer length") { test.Fatal(err) }
	_, err = EncodeI64Array[uint64](buffer[:0], []uint64 { 0, 4, 50, 19 })
	if !errIs(err, ErrWrongBufferLength, "encoding []int64: wrong buffer length") { test.Fatal(err) }
	_, _, err = DecodeI64Array[uint64](buffer[:])
	if err != nil { test.Fatal(err) }
	_, _, err = DecodeI64Array[uint64](buffer[:0])
	if err != nil { test.Fatal(err) }
	
	for _ = range largeNumberNTestRounds {
		array := randInts[uint64](rand.Intn(16))
		length, _ := I64ArraySize(array)
		if length != 8 * len(array) { test.Fatalf("%d != %d", length, 8 * len(array)) }
		_, err := EncodeI64Array[uint64](buffer[:length], array)
		if err != nil { test.Fatal(err) }
		decoded, _, err := DecodeI64Array[uint64](buffer[:length])
		if err != nil { test.Fatal(err) }
		if !slices.Equal(decoded, array) {
			test.Fatalf("%v != %v", decoded, array)
		}
	}
}

func TestStringArray(test *testing.T) {
	var buffer [8192]byte
	_, err := EncodeStringArray[string](buffer[:], []string { "0", "4", "50", "19" })
	if !errIs(err, ErrWrongBufferLength, "encoding []string: wrong buffer length") { test.Fatal(err) }
	_, err = EncodeStringArray[string](buffer[:0], []string { "0", "4", "50", "19" })
	if !errIs(err, ErrWrongBufferLength, "encoding []string: wrong buffer length") { test.Fatal(err) }
	_, _, err = DecodeStringArray[string](buffer[:0])
	if err != nil { test.Fatal(err) }
	
	for _ = range largeNumberNTestRounds {
		array := randStrings[string](rand.Intn(16), 16)
		length, _ := StringArraySize(array)
		// TODO test length
		_, err := EncodeStringArray[string](buffer[:length], array)
		if err != nil { test.Fatal(err) }
		decoded, _, err := DecodeStringArray[string](buffer[:length])
		if err != nil { test.Fatal(err) }
		if !slices.Equal(decoded, array) {
			test.Fatalf("%v != %v", decoded, array)
		}
	}
}