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

package saxocgo

/*
#cgo CFLAGS: -I./include
#cgo LDFLAGS: -L./lib
#cgo linux LDFLAGS: -L/usr/local/lib -lquickfix -lcfixsaxo -pthread -lm
#include <libcfix.h>
#include <stdlib.h>

extern void GoOnSaxoMdMessage(TickFull* tick, void* ctx);

void OnSaxoMdMessage(TickFull* tick, void* ctx) {
	GoOnSaxoMdMessage(tick, ctx);
}

*/
import "C"

import (
	"errors"
	"unsafe"
)

const MAX_BID_ASK_COUNT = 25

type FixTick struct {
	AskPrice    [MAX_BID_ASK_COUNT]float64
	BidPrice    [MAX_BID_ASK_COUNT]float64
	AskVolume   [MAX_BID_ASK_COUNT]float64
	BidVolume   [MAX_BID_ASK_COUNT]float64
	Symbol      [8]byte
	Time        int32
	Millisecond int32
	AskCount    int32
	BidCount    int32
}

func Symbol(symbol [8]byte) string {
	for i, v := range symbol {
		if v == 0 {
			return string(symbol[:i])
		}
	}
	return string(symbol[:])
}

type App struct {
	symbolMap         map[string]string
	account, password string
	Ch                chan *FixTick
}

func NewApp(symbolMap map[string]string, account, password string) *App {
	return &App{
		symbolMap: symbolMap,
		account:   account,
		password:  password,
		Ch:        make(chan *FixTick, 1024),
	}
}

func (app *App) Run(fname string) error {
	capp := C.SaxoCreateApp()
	if capp == nil {
		return errors.New("C.CreateApp() error")
	}

	for key, val := range app.symbolMap {
		cid := C.CString(key)
		csymbol := C.CString(val)
		C.SaxoAddSymbol(capp, cid, csymbol)
		C.free(unsafe.Pointer(cid))
		C.free(unsafe.Pointer(csymbol))
	}

	fn := C.fnSaxoOnMdMessage(C.OnSaxoMdMessage)
	C.SaxoReg_OnMdMessage(capp, fn, unsafe.Pointer(app))

	cfname := C.CString(fname)
	defer C.free(unsafe.Pointer(cfname))
	C.SaxoAppRun(capp, cfname)
	return nil
}

func (app *App) onMdMessage(tick *FixTick) {
	// log.Println("App.onMdMessage", tick)
	select {
	case app.Ch <- tick:
	default:
	}
}