package base

//一个更加简单的计算K线的接口
//提供
//1. Peek
//2. Align
//3. Next 
import "tickserver/api/lmaxapi/markinfo"
import "encoding/binary"
import "io"
import "fmt"
import "unsafe"

type  result struct {
    data *OhlcGo
    isnew bool
    err error
}

type CandleCalc struct {
    candle   *Candle
    reader   io.Reader
    tick     TickGo
    retTick  TickGo
    nextTick TickGo
    num      int
    peek     int
    ret      result
    last     result
    symbolId int
    period int
    maxComp int
    minPeriod int
}

func NewCandleCalc(symbolId int, period int, trans *TimezoneTrans, reader io.Reader) (*CandleCalc, error) {
    name, err := markinfo.SymbolName(symbolId)
    if err != nil {return nil, err}
    point, err := markinfo.SymbolPoint(name)
    if err != nil {return nil, err}
    candle , err := NewCandle(period, point, nil, 0)
    if err != nil {
        return nil, err
    }
    candle.SetTimezoneTrans(trans)
    calc := CandleCalc{}
    calc.candle = candle
    calc.reader = reader
    calc.symbolId = symbolId
    calc.period = period
    calc.maxComp = 12 * 3600
    calc.minPeriod = 60
    return &calc, nil
}

func (calc *CandleCalc) SetConf(key int, conf interface{}) (int, error) {
    if key == CANDLE_AUTOCOMPLETE_MAX {
        calc.maxComp = conf.(int)
    }
    return calc.candle.Set(key, conf)
}

func (calc *CandleCalc) SetMinPeriod(period int) {
    calc.minPeriod = period
}


func  (calc *CandleCalc) PeriodSecond() int {
    return calc.period
}

func  (calc *CandleCalc) NodataAlignTime() int {
    return calc.maxComp
}

func (calc *CandleCalc) readTick() error {
    calc.retTick = calc.tick
    if calc.tick.Time == 0 {//first time
        err := calc.readNextTick()
        if err != nil { return err }
        calc.tick = calc.nextTick
        return nil
    } else {
        if calc.nextTick == calc.tick { //nextTick 已经被读取了
            err := calc.readNextTick()
            if err != nil { return err }
        }
        t1 := calc.minPeriod * (int(calc.nextTick.Time) /calc.minPeriod)
        t2 := calc.minPeriod * (int(calc.tick.Time) /calc.minPeriod)
        if t1 - t2 > calc.minPeriod  && t1 - t2 < calc.maxComp { //需要补全,不需要读取next
            calc.tick.Time = int32(t2 + calc.minPeriod)
            return nil
        } else {
            calc.tick = calc.nextTick
            return nil
        }
    }
    return nil
}

func (calc *CandleCalc) readNextTick() (error) {
    //保存上一个tick
    for {
        err := binary.Read(calc.reader, binary.LittleEndian, &calc.nextTick)
        if err != nil {
            return err
        }
        //检查tick是否往回走了，避免这样的tick
        if calc.retTick.Time > calc.nextTick.Time || (calc.retTick.Time == calc.nextTick.Time && calc.retTick.Ms > calc.nextTick.Ms) {
            //直接忽略这样的tick
            fmt.Println("error tick.", calc.retTick, calc.nextTick)
            continue
        }
        break
    }
    return nil
}

func (calc *CandleCalc) Next() (*OhlcGo, bool, error) {
    if calc.peek > 0 {
        calc.peek = 0
        return calc.ret.data, calc.ret.isnew, calc.ret.err
    }
    if calc.num > 0 {
        calc.num--
        calc.ret.isnew = true
        return calc.readNext()
    }
    err := calc.readTick()
    if err != nil {
        return nil, false, err
    }
    calc.num = calc.candle.UpdateTick((*Tick)(unsafe.Pointer(&calc.tick)))
    if calc.num == 0 {
        calc.ret.isnew = false
        return calc.readNext()
    } else {
        calc.num--
        calc.ret.isnew = true
        return calc.readNext()
    }
    return nil, false, io.EOF
}

func (calc *CandleCalc) readNext() (*OhlcGo, bool, error) {
    ohlc := Ohlc{}
    calc.candle.Next(&ohlc)
    if calc.last.data != nil && calc.last.data.Time == calc.ret.data.Time {
        calc.last.isnew = false
    }
    calc.last = calc.ret
    //赋值
    tmp := ohlc.ToGOStruct()
    calc.ret.data = &tmp
    calc.ret.err = nil
    //fmt.Println(tmp)
    return calc.ret.data, calc.ret.isnew, calc.ret.err
}

//只能向前查看一个数据
func (calc *CandleCalc) Peek() (*OhlcGo, bool, error) {
    if calc.peek == 0 {
        calc.ret.data, calc.ret.isnew, calc.ret.err = calc.Next()
    }
    calc.peek++
    return calc.ret.data, calc.ret.isnew, calc.ret.err
}

func (calc *CandleCalc) Align(time int32) (*OhlcGo, bool, error)  {
    //补全前先往前查看一下
    calc.Peek()
    if calc.ret.data == nil && calc.last.data == nil { //保证有数据
        return nil, false, fmt.Errorf("no current or last data, align failed")
    }
    //第一个点的补全比较特殊，可以前后补全
    if calc.last.data == nil {
        ohlc := *calc.ret.data
        ohlc.Time = time
        //上次返回的数据
        calc.last = calc.ret
        calc.last.data = &ohlc
        return &ohlc, calc.ret.isnew, calc.ret.err
    }
    if time == 0 {
        return calc.last.data, false, calc.last.err
    }
    current := *calc.last.data
    if calc.ret.data == nil {
        goto align
    }
    //补全不能大于ret的时间,否则时间会往回走, 所以一般补全前要peek一下
    if time > calc.ret.data.Time {
        if calc.ret.data.TickVolumn == 0 {//补全的数据，忽略到time
            goto align
        }
        fmt.Println(calc.tick, calc.period, time)
        panic(fmt.Sprintf("%d", calc.ret.data.Time))
        return nil, true, fmt.Errorf("time > peek Time align time error.")
    }

    if time < current.Time {
        return nil, true, fmt.Errorf("time < current Time align time error.")
    }
align:
    //时间没有变，那么就用current
    if time == current.Time {
        calc.last.isnew = false
        return &current, false, calc.last.err
    }
    //往前补一个
    current.Time = time
    current.Open = current.Close
    current.High = current.Close
    current.Low  = current.Close
    current.TickVolumn = 0
    current.RealVolumn = 0
    //更新last
    calc.last.data = &current
    calc.last.isnew = true
    calc.last.err = nil
    if calc.ret.data != nil && calc.ret.data.Time == current.Time {
        calc.ret.isnew = false
    }
    return &current, true, nil
}

func (calc *CandleCalc) LastTick() (TickGo) {
    return calc.tick
}

func (calc *CandleCalc) Last() (TickGo) {
    return calc.tick
}

func (calc *CandleCalc) RetTime() int32 {
    return calc.ret.data.Time
}

func (calc *CandleCalc) LastTime() int32 {
    return calc.last.data.Time
}

func (calc *CandleCalc) TickTime() int64 {
    return int64(calc.tick.Time) * 1000 + int64(calc.tick.Ms)
}

func (calc *CandleCalc) AlignTick() (TickGo) {
    return calc.retTick
}

func (calc *CandleCalc) AlignTickTime(t int64) (TickGo) {
    tick := calc.retTick
    tick.Time = int32(t/1000)
    tick.Ms = int16(t % 1000)
    return tick
}