// Copyright 2013-2014 Fuzamei tech Ltd. All rights reserved.

package market

// 本文件实现fzm相关的操作: 获取历史数据和动态行情数据以及产品列表

import (
	"encoding/json"
	"errors"
	"io/ioutil"
	"log"
	"os"
	"sync"

	"tickserver/framework/event"
)

const fzmInsTable = "Fzm_inss"
const (
	BufMax = 2048
)

// FzmFx定义了交易所
// 集成了所有的数据源: lmax, easyforex, oanda, macoin等
// 使用数据库管理下载的历史数据
// 并在内存中缓存了最新的tick数据和candleK线数据
// 实现了Server服务的接口
type FzmEx struct {
	db        *MyDB                  // 数据库
	dsMap     map[string]DataSource  // 数据源map
	imu       sync.Mutex             // 保护insMap
	insMap    map[string]*Instrument // 保存所有的instrument
	inssFname string                 // instruments 列表文件
}

func makeTBMap() map[int]map[string]*TickBuffer {
	tbMap := make(map[int]map[string]*TickBuffer)
	for k, _ := range basePeriodSet {
		tbMap[k] = make(map[string]*TickBuffer)
	}
	return tbMap
}

func NewFzmEx(db *MyDB, inssFname string) *FzmEx {
	insMap, err := readInssTable(inssFname)
	if err != nil {
		//log.Println("NewFzmEx warning:", err)
		insMap = make(map[string]*Instrument)
	}

	//log.Println("NewFzmEx:", insMap)

	return &FzmEx{
		dsMap:     make(map[string]DataSource),
		insMap:    insMap,
		db:        db,
		inssFname: inssFname,
	}
}

func (ex *FzmEx) GetIns(insId string) *Instrument {
	ex.imu.Lock()
	defer ex.imu.Unlock()
	return ex.insMap[insId]
}

func (ex *FzmEx) setIns(ins *Instrument) {
	ex.imu.Lock()
	delete(ex.insMap, ins.Id)
	ex.insMap[ins.Id] = ins
	ex.imu.Unlock()
	// f := ex.onMarket()
	// ins.OnMarket().Attach(f)
}

func (ex *FzmEx) GetCacheCandles(insId string, period int) ([]Candle, error) {
	ds, ok := ex.dsMap[InsIdPrefix(insId)]
	if !ok {
		return nil, errors.New("GetCacheCandles error: insId is NOT in insMap: " + insId)
	}
	return ds.GetCacheCandles(insId, period)
}

func (ex *FzmEx) GetCacheTicks(insId string) ([]Tick, error) {
	ds, ok := ex.dsMap[InsIdPrefix(insId)]
	if !ok {
		return nil, errors.New("GetLastTicks error: insId is NOT in insMap: " + insId)
	}
	return ds.GetCacheTicks(insId)
}

func (ex *FzmEx) GetTimeList(insId, period, beginStr string) ([]string, error) {
	ds, ok := ex.dsMap[InsIdPrefix(insId)]
	if !ok {
		return nil, errors.New("GetLastTicks error: insId is NOT in insMap: " + insId)
	}
	return ds.GetTimeList(insId, period, beginStr)
}

func (ex *FzmEx) SaveAllTicks() {
	for _, ds := range ex.dsMap {
		ds.SaveAllTicks()
	}
}

func (ex *FzmEx) AddDS(name string, ds DataSource) {
	ex.dsMap[name] = ds
	ds.SubIns().Attach(func(v interface{}) error {
		ins, ok := v.(*Instrument)
		if !ok {
			log.Fatal("FzmEx.AddDS error. v is NOT *Instrument")
		}
		ex.setIns(ins)
		return nil
	})
}

func readInssTable(inssFname string) (map[string]*Instrument, error) {
	f, err := os.Open(inssFname)
	if err != nil {
		return nil, err
	}
	defer f.Close()
	dec := json.NewDecoder(f)
	insMap := make(map[string]*Instrument)
	err = dec.Decode(&insMap)
	if err != nil {
		return nil, err
	}
	return insMap, nil
}

func (ex *FzmEx) writeInssTable() error {
	b, err := json.MarshalIndent(ex.insMap, "", "  ")
	if err != nil {
		return err
	}
	ioutil.WriteFile(ex.inssFname, b, os.ModePerm)
	return nil
}

func (ex *FzmEx) Instruments() map[string]*Instrument {
	ex.writeInssTable()
	return ex.insMap
}

func (ex *FzmEx) SubMarket(insId string) *event.Event {
	ex.imu.Lock()
	ins, ok := ex.insMap[insId]
	ex.imu.Unlock()
	if !ok {
		return nil
	}
	//log.Println("FzmEx.SubMarket:", insId)
	return ins.mkPublisher.Event()
}