package redis

import "context"

type BitMapCmdable interface {
	GetBit(ctx context.Context, key string, offset int64) *IntCmd
	SetBit(ctx context.Context, key string, offset int64, value int) *IntCmd
	BitCount(ctx context.Context, key string, bitCount *BitCount) *IntCmd
	BitOpAnd(ctx context.Context, destKey string, keys ...string) *IntCmd
	BitOpOr(ctx context.Context, destKey string, keys ...string) *IntCmd
	BitOpXor(ctx context.Context, destKey string, keys ...string) *IntCmd
	BitOpNot(ctx context.Context, destKey string, key string) *IntCmd
	BitPos(ctx context.Context, key string, bit int64, pos ...int64) *IntCmd
	BitPosSpan(ctx context.Context, key string, bit int8, start, end int64, span string) *IntCmd
	BitField(ctx context.Context, key string, values ...interface{}) *IntSliceCmd
}

func (c cmdable) GetBit(ctx context.Context, key string, offset int64) *IntCmd {
	cmd := NewIntCmd(ctx, "getbit", key, offset)
	_ = c(ctx, cmd)
	return cmd
}

func (c cmdable) SetBit(ctx context.Context, key string, offset int64, value int) *IntCmd {
	cmd := NewIntCmd(
		ctx,
		"setbit",
		key,
		offset,
		value,
	)
	_ = c(ctx, cmd)
	return cmd
}

type BitCount struct {
	Start, End int64
}

func (c cmdable) BitCount(ctx context.Context, key string, bitCount *BitCount) *IntCmd {
	args := []interface{}{"bitcount", key}
	if bitCount != nil {
		args = append(
			args,
			bitCount.Start,
			bitCount.End,
		)
	}
	cmd := NewIntCmd(ctx, args...)
	_ = c(ctx, cmd)
	return cmd
}

func (c cmdable) bitOp(ctx context.Context, op, destKey string, keys ...string) *IntCmd {
	args := make([]interface{}, 3+len(keys))
	args[0] = "bitop"
	args[1] = op
	args[2] = destKey
	for i, key := range keys {
		args[3+i] = key
	}
	cmd := NewIntCmd(ctx, args...)
	_ = c(ctx, cmd)
	return cmd
}

func (c cmdable) BitOpAnd(ctx context.Context, destKey string, keys ...string) *IntCmd {
	return c.bitOp(ctx, "and", destKey, keys...)
}

func (c cmdable) BitOpOr(ctx context.Context, destKey string, keys ...string) *IntCmd {
	return c.bitOp(ctx, "or", destKey, keys...)
}

func (c cmdable) BitOpXor(ctx context.Context, destKey string, keys ...string) *IntCmd {
	return c.bitOp(ctx, "xor", destKey, keys...)
}

func (c cmdable) BitOpNot(ctx context.Context, destKey string, key string) *IntCmd {
	return c.bitOp(ctx, "not", destKey, key)
}

// BitPos is an API before Redis version 7.0, cmd: bitpos key bit start end
// if you need the `byte | bit` parameter, please use `BitPosSpan`.
func (c cmdable) BitPos(ctx context.Context, key string, bit int64, pos ...int64) *IntCmd {
	args := make([]interface{}, 3+len(pos))
	args[0] = "bitpos"
	args[1] = key
	args[2] = bit
	switch len(pos) {
	case 0:
	case 1:
		args[3] = pos[0]
	case 2:
		args[3] = pos[0]
		args[4] = pos[1]
	default:
		panic("too many arguments")
	}
	cmd := NewIntCmd(ctx, args...)
	_ = c(ctx, cmd)
	return cmd
}

// BitPosSpan supports the `byte | bit` parameters in redis version 7.0,
// the bitpos command defaults to using byte type for the `start-end` range,
// which means it counts in bytes from start to end. you can set the value
// of "span" to determine the type of `start-end`.
// span = "bit", cmd: bitpos key bit start end bit
// span = "byte", cmd: bitpos key bit start end byte
func (c cmdable) BitPosSpan(ctx context.Context, key string, bit int8, start, end int64, span string) *IntCmd {
	cmd := NewIntCmd(ctx, "bitpos", key, bit, start, end, span)
	_ = c(ctx, cmd)
	return cmd
}

// BitField accepts multiple values:
//   - BitField("set", "i1", "offset1", "value1","cmd2", "type2", "offset2", "value2")
//   - BitField([]string{"cmd1", "type1", "offset1", "value1","cmd2", "type2", "offset2", "value2"})
//   - BitField([]interface{}{"cmd1", "type1", "offset1", "value1","cmd2", "type2", "offset2", "value2"})
func (c cmdable) BitField(ctx context.Context, key string, values ...interface{}) *IntSliceCmd {
	args := make([]interface{}, 2, 2+len(values))
	args[0] = "bitfield"
	args[1] = key
	args = appendArgs(args, values)
	cmd := NewIntSliceCmd(ctx, args...)
	_ = c(ctx, cmd)
	return cmd
}