package proto

import (
	"encoding"
	"fmt"
	"reflect"

	"github.com/go-redis/redis/internal"
)

func Scan(b []byte, v interface{}) error {
	switch v := v.(type) {
	case nil:
		return fmt.Errorf("redis: Scan(nil)")
	case *string:
		*v = internal.BytesToString(b)
		return nil
	case *[]byte:
		*v = b
		return nil
	case *int:
		var err error
		*v, err = atoi(b)
		return err
	case *int8:
		n, err := parseInt(b, 10, 8)
		if err != nil {
			return err
		}
		*v = int8(n)
		return nil
	case *int16:
		n, err := parseInt(b, 10, 16)
		if err != nil {
			return err
		}
		*v = int16(n)
		return nil
	case *int32:
		n, err := parseInt(b, 10, 32)
		if err != nil {
			return err
		}
		*v = int32(n)
		return nil
	case *int64:
		n, err := parseInt(b, 10, 64)
		if err != nil {
			return err
		}
		*v = n
		return nil
	case *uint:
		n, err := parseUint(b, 10, 64)
		if err != nil {
			return err
		}
		*v = uint(n)
		return nil
	case *uint8:
		n, err := parseUint(b, 10, 8)
		if err != nil {
			return err
		}
		*v = uint8(n)
		return nil
	case *uint16:
		n, err := parseUint(b, 10, 16)
		if err != nil {
			return err
		}
		*v = uint16(n)
		return nil
	case *uint32:
		n, err := parseUint(b, 10, 32)
		if err != nil {
			return err
		}
		*v = uint32(n)
		return nil
	case *uint64:
		n, err := parseUint(b, 10, 64)
		if err != nil {
			return err
		}
		*v = n
		return nil
	case *float32:
		n, err := parseFloat(b, 32)
		if err != nil {
			return err
		}
		*v = float32(n)
		return err
	case *float64:
		var err error
		*v, err = parseFloat(b, 64)
		return err
	case *bool:
		*v = len(b) == 1 && b[0] == '1'
		return nil
	case encoding.BinaryUnmarshaler:
		return v.UnmarshalBinary(b)
	default:
		return fmt.Errorf(
			"redis: can't unmarshal %T (consider implementing BinaryUnmarshaler)", v)
	}
}

func ScanSlice(data []string, slice interface{}) error {
	v := reflect.ValueOf(slice)
	if !v.IsValid() {
		return fmt.Errorf("redis: ScanSlice(nil)")
	}
	if v.Kind() != reflect.Ptr {
		return fmt.Errorf("redis: ScanSlice(non-pointer %T)", slice)
	}
	v = v.Elem()
	if v.Kind() != reflect.Slice {
		return fmt.Errorf("redis: ScanSlice(non-slice %T)", slice)
	}

	for i, s := range data {
		elem := internal.SliceNextElem(v)
		if err := Scan(internal.StringToBytes(s), elem.Addr().Interface()); err != nil {
			return fmt.Errorf("redis: ScanSlice(index=%d value=%q) failed: %s", i, s, err)
		}
	}

	return nil
}