package importer

import (
	"encoding/json"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"sync"
	"sync/atomic"

	"git.wecise.com/wecise/cgimport/odbc"
	"git.wecise.com/wecise/cgimport/reader"
	"git.wecise.com/wecise/util/filewalker"
	"git.wecise.com/wecise/util/merrs"
	"git.wecise.com/wecise/util/rc"
)

var mcfg = odbc.Config
var logger = odbc.Logger

type Importer struct {
	datapath     string
	parallel     int
	importrc     *rc.RoutinesController
	odbcimporter *ODBCImporter
}

func ImportDir(datapath string, parallel int) (filescount, recordscount int64, err error) {
	importer := &Importer{
		datapath:     datapath,
		parallel:     parallel,
		importrc:     rc.NewRoutinesController("", 1000),
		odbcimporter: NewODBCImporter(),
	}
	return importer.Import()
}

func (importer *Importer) Import() (filescount, recordscount int64, err error) {
	// 遍历文件目录
	var cgirc = rc.NewRoutinesController("", importer.parallel)
	var wg sync.WaitGroup
	fw, e := filewalker.NewFileWalker([]string{importer.datapath}, ".*")
	if e != nil {
		err = e
		return
	}
	e = fw.List(func(basedir string, fpath string) bool {
		if err != nil {
			return false
		}
		filename := filepath.Join(basedir, fpath)
		wg.Add(1)
		cgirc.ConcurCall(1,
			func() {
				defer wg.Done()
				records, e := importer.ImportFile(filename)
				if e != nil {
					err = e
					return
				}
				atomic.AddInt64(&filescount, 1)
				atomic.AddInt64(&recordscount, int64(records))
			},
		)
		return true
	})
	wg.Wait()
	if e != nil {
		err = e
		return
	}
	return
}

func (importer *Importer) ImportFile(filepath string) (blockcount int, err error) {
	f, e := os.Open(filepath)
	if e != nil {
		return blockcount, merrs.NewError(e, merrs.SSMaps{{"filename": filepath}})
	}
	defer f.Close()
	return importer.importReader(filepath, f)
}

func (importer *Importer) importReader(filename string, buf io.Reader) (blockcount int, err error) {
	br, e := reader.NewBlockReader(filename, buf)
	if e != nil {
		return blockcount, merrs.NewError(e, merrs.SSMaps{{"filename": filename}})
	}
	var wg sync.WaitGroup
	defer wg.Wait()
	for {
		if err != nil {
			break
		}
		block, linecount, e := br.ReadBlock()
		if e != nil {
			return blockcount, merrs.NewError(e, merrs.SSMaps{{"filename": filename}, {"line": fmt.Sprint(linecount)}})
		}
		if block == nil {
			return
		}
		wg.Add(1)
		e = importer.importrc.ConcurCall(1, func() {
			defer wg.Done()
			e = importer.importRecord(block, filename, linecount)
			if e != nil {
				err = merrs.NewError(e, merrs.SSMaps{{"filename": filename}, {"line": fmt.Sprint(linecount)}})
				return
			}
			blockcount++
		})
		if e != nil {
			return blockcount, merrs.NewError(e, merrs.SSMaps{{"filename": filename}, {"line": fmt.Sprint(linecount)}})
		}
	}
	return
}

func (importer *Importer) importRecord(record map[string]any, filename string, linecount int) (err error) {
	bs, e := json.MarshalIndent(record, "", "  ")
	if e != nil {
		return e
	}
	logger.Debug(fmt.Sprint("import ", filename, "[", linecount, "]:", string(bs)))
	e = importer.odbcimporter.ReviseClassStruct(record)
	if e != nil {
		return e
	}
	e = importer.odbcimporter.InsertData(record)
	if e != nil {
		return e
	}
	return
}