package server

import (
	"github.com/siddontang/go/hack"
	"github.com/siddontang/ledisdb/ledis"
	"strconv"
	"time"
)

func lpushCommand(c *client) error {
	args := c.args
	if len(args) < 2 {
		return ErrCmdParams
	}

	if n, err := c.db.LPush(args[0], args[1:]...); err != nil {
		return err
	} else {
		c.resp.writeInteger(n)
	}

	return nil
}

func rpushCommand(c *client) error {
	args := c.args
	if len(args) < 2 {
		return ErrCmdParams
	}

	if n, err := c.db.RPush(args[0], args[1:]...); err != nil {
		return err
	} else {
		c.resp.writeInteger(n)
	}

	return nil
}

func lpopCommand(c *client) error {
	args := c.args
	if len(args) != 1 {
		return ErrCmdParams
	}

	if v, err := c.db.LPop(args[0]); err != nil {
		return err
	} else {
		c.resp.writeBulk(v)
	}

	return nil
}

func rpopCommand(c *client) error {
	args := c.args
	if len(args) != 1 {
		return ErrCmdParams
	}

	if v, err := c.db.RPop(args[0]); err != nil {
		return err
	} else {
		c.resp.writeBulk(v)
	}

	return nil
}

func llenCommand(c *client) error {
	args := c.args
	if len(args) != 1 {
		return ErrCmdParams
	}

	if n, err := c.db.LLen(args[0]); err != nil {
		return err
	} else {
		c.resp.writeInteger(n)
	}

	return nil
}

func lindexCommand(c *client) error {
	args := c.args
	if len(args) != 2 {
		return ErrCmdParams
	}

	index, err := ledis.StrInt64(args[1], nil)
	if err != nil {
		return ErrValue
	}

	if v, err := c.db.LIndex(args[0], int32(index)); err != nil {
		return err
	} else {
		c.resp.writeBulk(v)
	}

	return nil
}

func lrangeCommand(c *client) error {
	args := c.args
	if len(args) != 3 {
		return ErrCmdParams
	}

	var start int64
	var stop int64
	var err error

	start, err = ledis.StrInt64(args[1], nil)
	if err != nil {
		return ErrValue
	}

	stop, err = ledis.StrInt64(args[2], nil)
	if err != nil {
		return ErrValue
	}

	if v, err := c.db.LRange(args[0], int32(start), int32(stop)); err != nil {
		return err
	} else {
		c.resp.writeSliceArray(v)
	}

	return nil
}

func lclearCommand(c *client) error {
	args := c.args
	if len(args) != 1 {
		return ErrCmdParams
	}

	if n, err := c.db.LClear(args[0]); err != nil {
		return err
	} else {
		c.resp.writeInteger(n)
	}

	return nil
}

func lmclearCommand(c *client) error {
	args := c.args
	if len(args) < 1 {
		return ErrCmdParams
	}

	if n, err := c.db.LMclear(args...); err != nil {
		return err
	} else {
		c.resp.writeInteger(n)
	}

	return nil
}

func lexpireCommand(c *client) error {
	args := c.args
	if len(args) != 2 {
		return ErrCmdParams
	}

	duration, err := ledis.StrInt64(args[1], nil)
	if err != nil {
		return ErrValue
	}

	if v, err := c.db.LExpire(args[0], duration); err != nil {
		return err
	} else {
		c.resp.writeInteger(v)
	}

	return nil
}

func lexpireAtCommand(c *client) error {
	args := c.args
	if len(args) != 2 {
		return ErrCmdParams
	}

	when, err := ledis.StrInt64(args[1], nil)
	if err != nil {
		return ErrValue
	}

	if v, err := c.db.LExpireAt(args[0], when); err != nil {
		return err
	} else {
		c.resp.writeInteger(v)
	}

	return nil
}

func lttlCommand(c *client) error {
	args := c.args
	if len(args) != 1 {
		return ErrCmdParams
	}

	if v, err := c.db.LTTL(args[0]); err != nil {
		return err
	} else {
		c.resp.writeInteger(v)
	}

	return nil
}

func lpersistCommand(c *client) error {
	args := c.args
	if len(args) != 1 {
		return ErrCmdParams
	}

	if n, err := c.db.LPersist(args[0]); err != nil {
		return err
	} else {
		c.resp.writeInteger(n)
	}

	return nil
}

func lxscanCommand(c *client) error {
	key, match, count, err := parseScanArgs(c)
	if err != nil {
		return err
	}

	if ay, err := c.db.LScan(key, count, false, match); err != nil {
		return err
	} else {
		data := make([]interface{}, 2)
		if len(ay) < count {
			data[0] = []byte("")
		} else {
			data[0] = ay[len(ay)-1]
		}
		data[1] = ay
		c.resp.writeArray(data)
	}
	return nil
}

func blpopCommand(c *client) error {
	keys, timeout, err := lParseBPopArgs(c)
	if err != nil {
		return err
	}

	if ay, err := c.db.BLPop(keys, timeout); err != nil {
		return err
	} else {
		c.resp.writeArray(ay)
	}
	return nil
}

func brpopCommand(c *client) error {
	keys, timeout, err := lParseBPopArgs(c)
	if err != nil {
		return err
	}

	if ay, err := c.db.BRPop(keys, timeout); err != nil {
		return err
	} else {
		c.resp.writeArray(ay)
	}
	return nil

}

func lParseBPopArgs(c *client) (keys [][]byte, timeout time.Duration, err error) {
	args := c.args
	if len(args) < 2 {
		err = ErrCmdParams
		return
	}

	var t float64
	if t, err = strconv.ParseFloat(hack.String(args[len(args)-1]), 64); err != nil {
		return
	}

	timeout = time.Duration(t * float64(time.Second))

	keys = args[0 : len(args)-1]
	return
}

func init() {
	register("blpop", blpopCommand)
	register("brpop", brpopCommand)
	register("lindex", lindexCommand)
	register("llen", llenCommand)
	register("lpop", lpopCommand)
	register("lrange", lrangeCommand)
	register("lpush", lpushCommand)
	register("rpop", rpopCommand)
	register("rpush", rpushCommand)

	//ledisdb special command

	register("lclear", lclearCommand)
	register("lmclear", lmclearCommand)
	register("lexpire", lexpireCommand)
	register("lexpireat", lexpireAtCommand)
	register("lttl", lttlCommand)
	register("lpersist", lpersistCommand)
	register("lxscan", lxscanCommand)
}