package base

import "tickserver/api/lmaxapi/markinfo"
import "unsafe"
import "errors"

type TickReader interface {
    Read() (*TickGo, error)
}

type CandleReader interface {
    Read() (*OhlcGo, error)
}

type CandleGenerate struct {
    candle   *Candle
    reader   TickReader
    creader  CandleReader
    symbolId int
    period   int
    maxComp  int
    num      int
}

func NewCandleGenerate(symbolId int, period int, data *OhlcGo, trans *TimezoneTrans, reader interface{}) (*CandleGenerate, error) {
    name, err := markinfo.SymbolName(symbolId)
    if err != nil {return nil, err}
    point, err := markinfo.SymbolPoint(name)
    if err != nil {return nil, err}
    var p unsafe.Pointer
    p = unsafe.Pointer(data)
    if data != nil {
        p = unsafe.Pointer(data.ToCStruct())
    }
    candle , err := NewCandle(period, point, p, 0)
    if err != nil {
        return nil, err
    }
    if trans == nil {
        trans, err = NewTimezoneTrans("etc/GMT", 0, "etc/GMT", 0, 0)
        if err != nil {
            return nil, err
        }
    }
    candle.SetTimezoneTrans(trans)
    calc := CandleGenerate{}
    calc.candle = candle
    if read, ok := reader.(TickReader) ; ok {
        calc.reader = read
    } else if  cread, ok := reader.(CandleReader) ; ok {
        calc.creader = cread
    } else {
        return nil, errors.New("unknow reader interface, must TickReader or OhlcReader")
    }
    calc.symbolId = symbolId
    calc.period = period
    calc.maxComp = 12 * 3600
    return &calc, nil
}

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

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

func  (calc *CandleGenerate) MaxAlignTime() int {
    return calc.maxComp
}

//CandleReader Interface
func (calc *CandleGenerate) Read() (*OhlcGo, error) {
    if calc.num > 0 {
        calc.num--
        return calc.readNext()
    }
    if calc.reader != nil {
        tick, err := calc.reader.Read()
        if err != nil {
            return nil, err
        }
        if tick == nil {
            panic("tick error.")
        }
        calc.num = calc.candle.UpdateTick((*Tick)(unsafe.Pointer(tick)))
    } else {
        ohlc, err := calc.creader.Read()
        if err != nil {
            return nil, err
        }
        if ohlc == nil {
            panic("ohlc error.")
        }
        calc.num = calc.candle.UpdateOhlc(ohlc.ToCStruct())
    }
    if calc.num == 0 { //没有补全
        return calc.readNext()
    }
    calc.num--
    return calc.readNext()
}

func (calc *CandleGenerate) readNext() (*OhlcGo, error) {
    ohlc := &Ohlc{}
    calc.candle.Next(ohlc)
    ret := ohlc.ToGOStruct()
    return &ret, nil
}