// Package fileparse define related functions for comtrade data processing
package fileparse

import (
	"context"
	"errors"
	"fmt"
	"path/filepath"
	"strings"
	"sync"
	"time"

	"wave_record/config"
	"wave_record/constant"
	"wave_record/database"
	"wave_record/go-comtrade"
	"wave_record/util"

	"github.com/panjf2000/ants/v2"
	"go.uber.org/zap"
)

// ParseFunc define ants concourrent exec func
var ParseFunc = func(parseConfig interface{}) {
	logger := zap.L()
	comtradeStorageConfig, ok := parseConfig.(config.ComtradeDataStorageConfig)
	if !ok {
		logger.Error("conversion comtrade parameter config type failed")
		return
	}

	fileName := filepath.Base(comtradeStorageConfig.ConfigFilePath)
	comtradeData, err := parseComtradeData(comtradeStorageConfig.ConfigFilePath, comtradeStorageConfig.DataFilePath)
	if err != nil {
		logger.Error("parsing comtrade data failed", zap.String("fileName", fileName), zap.Error(err))
		return
	}

	collection := database.MongoDBClient().Database(comtradeStorageConfig.DBName).Collection(comtradeData.Conf.StationName)
	ctx, cancel := context.WithTimeout(comtradeStorageConfig.Ctx, 5*time.Second)
	defer cancel()

	err = database.
		StorageComtradeIntoMongoDB(ctx, comtradeData, collection, logger)
	if err != nil {
		logger.Error("stroage comtrade data info mongoDB failed", zap.String("fileName", fileName), zap.Error(err))
	}
	comtradeStorageConfig.DelChan <- comtradeStorageConfig.ConfigFilePath
	comtradeStorageConfig.DelChan <- comtradeStorageConfig.DataFilePath
}

func parseComtradeData(configFilePath, dataFilePath string) (*comtrade.Comtrade, error) {
	logger := zap.L()

	comtrade, err := comtrade.ParseComtrade(configFilePath, dataFilePath)
	if err != nil {
		logger.Error("parse comtrade file failed", zap.Error(err))
		return nil, err
	}
	return comtrade, nil
}

// ParseComtradeFile define comtrade file parse func
func ParseComtradeFile(ctx context.Context, monitorDir string, dbName string, addChan chan string, delChan chan string, comtradeMap *sync.Map, pool *ants.PoolWithFunc) {
	logger := zap.L()

	for {
		addFilePath, ok := <-addChan
		if !ok {
			logger.Error("monitor add channel closed", zap.Bool("channel_status", ok))
			return
		}

		err := processComtradeFile(ctx, addFilePath, monitorDir, dbName, comtradeMap, addChan, delChan, pool, logger)
		if err != nil {
			if errors.Is(err, constant.ErrNotFindDatFile) {
				logger.Info("process comtrade file failed", zap.String("err", err.Error()))
				continue
			}
			logger.Error("process comtrade file failed", zap.Error(err))
		}
	}
}

func processComtradeFile(ctx context.Context, addFilePath string, monitorDir string, dbName string, comtradeMap *sync.Map, addChan chan string, delChan chan string, pool *ants.PoolWithFunc, logger *zap.Logger) error {
	lastElement := filepath.Base(addFilePath)
	fileName := strings.Split(lastElement, ".")[0]
	fileExtension := filepath.Ext(lastElement)

	switch fileExtension {
	case constant.ConfigFileSuffix:
		err := processConfigFile(ctx, dbName, addFilePath, delChan, comtradeMap, pool)
		if err != nil {
			return fmt.Errorf("process comtrade failed:%w", err)
		}
	case constant.DataFileSuffix:
		err := processDataFile(monitorDir, fileName, addFilePath, comtradeMap, addChan)
		if err != nil {
			return fmt.Errorf("process comtrade failed:%w", err)
		}
	default:
		logger.Warn("no support file style", zap.String("file_style", fileExtension))
		time.Sleep(5 * time.Second)
	}
	return nil
}

func processConfigFile(ctx context.Context, dbName string, configFilePath string, delchan chan string, comtradeMap *sync.Map, pool *ants.PoolWithFunc) error {
	dataFilePath, err := util.FileNameConvert(configFilePath)
	if err != nil {
		return fmt.Errorf("process config file failed:%w", err)
	}
	exist := util.FileExists(dataFilePath)
	if !exist {
		comtradeMap.Store(configFilePath, "")
		return constant.ErrNotFindDatFile
	}

	pool.Invoke(config.ComtradeDataStorageConfig{
		Ctx:            ctx,
		DelChan:        delchan,
		DBName:         dbName,
		ConfigFilePath: configFilePath,
		DataFilePath:   dataFilePath,
	})
	return nil
}

func processDataFile(monitorDir string, fileName string, dataFilePath string, comtradeMap *sync.Map, addChan chan string) error {
	configFileName := strings.Join([]string{fileName, constant.ConfigFileSuffix}, "")
	configFilePath := filepath.Join(monitorDir, configFileName)
	exist := util.FileExists(configFilePath)
	if exist {
		comtradeMap.Store(configFilePath, dataFilePath)
		addChan <- configFilePath
		return nil
	}
	// addChan <- dataFilePath
	return nil
}

// MoveComtradeFile define comtrade file remove from comtradeMap and move comtrade file from monitor dir to backup dir func
func MoveComtradeFile(backupDir string, comtradeMap *sync.Map, delChan chan string) {
	logger := zap.L()
	for {
		filePath := <-delChan
		fileName := filepath.Base(filePath)
		fileExtension := filepath.Ext(fileName)
		if fileExtension == constant.ConfigFileSuffix {
			comtradeMap.Delete(filePath)
		}
		backupFilePath := filepath.Join(backupDir, fileName)
		err := util.RemoveFile(filePath, backupFilePath)
		if err != nil {
			logger.Error("remove file to backup dir failed", zap.Error(err))
		}
	}
}