package importer

import (
	"encoding/json"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"regexp"
	"runtime"
	"strings"
	"sync"
	"sync/atomic"
	"time"

	"git.wecise.com/wecise/cgimport/graph"
	"git.wecise.com/wecise/cgimport/odbc"
	"git.wecise.com/wecise/cgimport/reader"
	"git.wecise.com/wecise/cgimport/schema"
	"github.com/wecisecode/util/cmap"
	"github.com/wecisecode/util/filewalker"
	"github.com/wecisecode/util/merrs"
	"github.com/wecisecode/util/pattern"
	"github.com/wecisecode/util/rc"
)

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

type Importer struct {
	datapath         string
	parallel         int
	rebuild          bool
	reload           bool
	importstatus     *CGIStatus
	fileimportrc     *rc.RoutinesController
	odbcqueryrc      *rc.RoutinesController
	odbcimporter     *ODBCImporter
	starttime        time.Time
	currentstarttime time.Time
	lastlogtime      cmap.ConcurrentMap[string, time.Time]
}

func ImportDir(datapath string, parallel int, rebuild, reload bool) (totalfilescount, totallinecount, totalrecordscount, totalretrycount int64, totalusetime time.Duration, filescount, linescount, recordscount, retrycount int64, usetime time.Duration, err error) {
	concurlimt := mcfg.GetInt("odbc.concurrent.limit", runtime.GOMAXPROCS(0))
	importer := &Importer{
		datapath:     datapath,
		parallel:     parallel,
		rebuild:      rebuild,
		reload:       reload,
		importstatus: NewCGIStatus(),
		fileimportrc: rc.NewRoutinesController("", parallel),
		odbcqueryrc:  rc.NewRoutinesControllerLimit("", concurlimt, concurlimt*5),
		odbcimporter: NewODBCImporter(),
		lastlogtime:  cmap.NewSingle[string, time.Time](),
	}
	return importer.Import()
}

func (importer *Importer) Import() (totalfilescount, totallinecount, totalrecordscount, totalretrycount int64, totalusetime time.Duration, filescount, linescount, recordscount, retrycount int64, usetime time.Duration, err error) {
	if odbc.DevPhase&odbc.DP_PROCESSCONTINUE != 0 && !importer.reload && !importer.rebuild {
		// reload
		err = importer.importstatus.Load()
		if err != nil {
			return
		}
	}
	err = importer.odbcimporter.init(importer.rebuild)
	if err != nil {
		return
	}
	//
	logger.Info("graph data import start")

	totalusetime = importer.importstatus.TotalUseTime
	importer.starttime = time.Now().Add(-totalusetime)
	importer.currentstarttime = time.Now()

	reedgefile := regexp.MustCompile("(?i).*edge.*.csv")
	efc, elc, erc, etc, ut, e := importer.ImportEdgeFiles(reedgefile, false)
	if e != nil {
		err = e
		return
	}
	afc, alc, arc, atc, ut, e := importer.ImportNonEdgeFiles(reedgefile, true)
	if e != nil {
		err = e
		return
	}
	totalfilescount = int64(len(importer.importstatus.ImportStatus)) + efc
	for _, v := range importer.importstatus.ImportStatus {
		totallinecount += v.LinesCount
		totalrecordscount += v.RecordsCount
		totalretrycount += v.RetryCount
	}
	totallinecount += elc
	totalrecordscount += erc
	totalretrycount += etc
	filescount = afc + efc
	linescount = alc + elc
	recordscount = arc + erc
	retrycount = atc + etc
	usetime = ut
	totalusetime = importer.importstatus.TotalUseTime

	importer.importstatus.WaitSaveDone()
	importer.alldone()
	return
}

func (importer *Importer) ImportEdgeFiles(reedgefile *regexp.Regexp, logstatus bool) (filescount, linecount, recordscount, retrycount int64, usetime time.Duration, err error) {
	return importer.ImportFiles(func(basedir string, fpath string) FWOP {
		if !reedgefile.MatchString(filepath.Base(fpath)) {
			// 忽略非EDGE文件
			return FWOP_IGNORE
		}
		return FWOP_CONTINUE
	}, logstatus)
}

func (importer *Importer) ImportNonEdgeFiles(reedgefile *regexp.Regexp, logstatus bool) (filescount, linecount, recordscount, retrycount int64, usetime time.Duration, err error) {
	return importer.ImportFiles(func(basedir string, fpath string) FWOP {
		if reedgefile.MatchString(filepath.Base(fpath)) {
			// 忽略EDGE文件
			return FWOP_IGNORE
		}
		return FWOP_CONTINUE
	}, logstatus)
}

type FWOP int

const (
	FWOP_IGNORE FWOP = iota + 1
	FWOP_BREAK
	FWOP_CONTINUE
)

func (importer *Importer) ImportFiles(fwop func(basedir string, fpath string) FWOP, logstatus bool) (filescount, linescount, recordscount, retrycount int64, usetime time.Duration, err error) {
	// 遍历文件目录
	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 {
			// 前方发生错误，结束遍历
			return false
		}
		if strings.Contains(fpath, string(filepath.Separator)) {
			// 忽略子目录，fw.List有序，目录排在文件后面，遇到子目录即可结束遍历
			return false
		}
		switch fwop(basedir, fpath) {
		case FWOP_IGNORE:
			// 忽略当前文件，继续处理下一文件
			return true
		case FWOP_BREAK:
			// 结束遍历
			return false
		case FWOP_CONTINUE:
		default:
		}
		// 继续处理当前文件
		filename := filepath.Join(basedir, fpath)
		filescount++
		wg.Add(1)
		// 并发处理
		importer.fileimportrc.ConcurCall(1,
			func() {
				defer wg.Done()
				importer.importstatus.mutex.RLock()
				importstatus := importer.importstatus.ImportStatus[filename]
				importer.importstatus.mutex.RUnlock()
				linefrom, blockfrom := int64(0), int64(0)
				totalretrycount := int64(0)
				if importstatus != nil {
					linefrom, blockfrom, totalretrycount = importstatus.LinesCount, importstatus.RecordsCount, importstatus.RetryCount
				}
				if linefrom == 0 {
					logger.Info("import", "file", filename)
				} else {
					logger.Info("import", "file", filename, "from line", linefrom)
				}
				lines, records, retries, e := importer.ImportFile(filename, linefrom, blockfrom, totalretrycount, logstatus)
				if e != nil {
					err = e
					return
				}
				atomic.AddInt64(&linescount, lines-linefrom)
				atomic.AddInt64(&recordscount, records-blockfrom)
				atomic.AddInt64(&retrycount, retries-totalretrycount)
				usetime = time.Since(importer.currentstarttime)
				importer.importstatus.mutex.Lock()
				if logstatus {
					importer.importstatus.ImportStatus[filename] = &ImportStatus{
						LinesCount:   lines,
						RecordsCount: records,
						RetryCount:   retries,
					}
				}
				importer.importstatus.TotalUseTime = time.Since(importer.starttime)
				importer.importstatus.mutex.Unlock()
				importer.importstatus.Save()
				if retries > 0 {
					logger.Info("file", filename, "total imported", lines, "lines", records, "records", retries, "retry times")
				} else {
					logger.Info("file", filename, "total imported", lines, "lines", records, "records")
				}
			},
		)
		return true
	})
	wg.Wait()
	if e != nil {
		if os.IsNotExist(e) {
			err = merrs.NewError(`directory "`+importer.datapath+`" not exist specified by "datapath"`, e)
		} else {
			err = merrs.NewError(e)
		}
		return
	}
	return
}

func (importer *Importer) ImportFile(filepath string, linefrom, blockfrom, totalretrycount int64, logstatus bool) (linecount, blockcount, retrycount int64, err error) {
	f, e := os.Open(filepath)
	if e != nil {
		return linecount, blockcount, retrycount, merrs.NewError(e, merrs.SSMaps{{"filename": filepath}})
	}
	defer f.Close()
	return importer.importReader(filepath, f, linefrom, blockfrom, totalretrycount, logstatus)
}

var fileclassmapping = cmap.NewSingle[string, *regexp.Regexp]()

func init() {
	fileclassmapping.Set("EDGE", regexp.MustCompile(pattern.Contain2RegexpString(`EDGE`)))
	fileclassmapping.Set("master", regexp.MustCompile(pattern.Contain2RegexpString(`MASTER`)))
	fileclassmapping.Set("level1", regexp.MustCompile(pattern.Contain2RegexpString(`_L1_`)))
	fileclassmapping.Set("level2", regexp.MustCompile(pattern.Contain2RegexpString(`_L2_`)))
	fileclassmapping.Set("level3", regexp.MustCompile(pattern.Contain2RegexpString(`_L3_`)))
	fileclassmapping.Set("level4", regexp.MustCompile(pattern.Contain2RegexpString(`_L4_`)))
	fileclassmapping.Set("level5", regexp.MustCompile(pattern.Contain2RegexpString(`_L5_`)))
	fileclassmapping.Set("level6", regexp.MustCompile(pattern.Contain2RegexpString(`_L6_`)))
	fileclassmapping.Set("level7", regexp.MustCompile(pattern.Contain2RegexpString(`_L7_`)))
	fileclassmapping.Set("level8", regexp.MustCompile(pattern.Contain2RegexpString(`_L8_`)))
	keys := mcfg.Keys()
	for _, key := range keys {
		if strings.HasPrefix(key, "cgi.mapping.class.") {
			classname := key[len("cgi.mapping.class."):]
			filepatterns := mcfg.GetStrings(key)
			for _, fp := range filepatterns {
				fp = pattern.Wildcard2RegexpString(fp)
				fileclassmapping.Set(classname, regexp.MustCompile(fp))
			}
		}
	}
}

func (importer *Importer) importReader(filename string, buf io.Reader, linefrom, blockfrom, totalretrycount int64, logstatus bool) (linecount, blockcount, retrycount int64, err error) {
	classname := ""
	fileclassmapping.Fetch(func(key string, v *regexp.Regexp) bool {
		if v.MatchString(filename) {
			classname = key
			return false
		}
		return true
	})
	if classname == "" {
		err = merrs.NewError("cannot mapping to class, filename:" + filename)
		return
	}
	br, e := reader.NewBlockReader(filename, classname, buf, importer.odbcimporter.schema)
	if e != nil {
		return linecount, blockcount, retrycount, merrs.NewError(e, merrs.SSMaps{{"filename": filename}})
	}
	skiplines := int(linefrom)
	blockcount = blockfrom
	doinglines := []int64{}
	donelines := linefrom
	doneblocks := blockfrom
	savedlines := linefrom
	savedblocks := blockfrom
	retrycount = totalretrycount
	linecount = linefrom
	// maxresponsetime := time.Duration(0)
	var wg sync.WaitGroup
	defer importer.done()
	defer wg.Wait()
	for {
		if err != nil {
			return
		}
		lastlinecount := linecount
		block, line, linenumber, e := br.ReadBlock(skiplines)
		linecount = int64(linenumber)
		if e != nil {
			return linecount, blockcount, retrycount, merrs.NewError(e, merrs.SSMaps{{"filename": filename}, {"linecount": fmt.Sprint(linecount)}, {"line": line}})
		}
		if block == nil {
			return
		}
		blockcount++
		wg.Add(1)
		doingline := linecount
		doingblock := blockcount
		if logstatus {
			doinglines = append(doinglines, doingline)
		}
		e = importer.odbcqueryrc.ConcurCall(1, func() {
			defer wg.Done()
			if err != nil {
				return
			}
			// st := time.Now()
			// defer func() {
			// 	ut := time.Since(st)
			// 	if ut > maxresponsetime {
			// 		maxresponsetime = ut
			// 	}
			// }()
			// logger.Info("G:", runtime.NumGoroutine(),
			// 	"RC:", importer.fileimportrc.ConcurCount(),
			// 	"WC:", importer.odbcqueryrc.ConcurCount(),
			// 	"RQ:", importer.fileimportrc.QueueCount(),
			// 	"WQ:", importer.odbcqueryrc.QueueCount(),
			// 	"maxresponsetime:", maxresponsetime)
			rc, e := importer.importRecord(block, line, filename, classname, int(doingline))
			atomic.AddInt64(&retrycount, int64(rc))
			if e != nil {
				err = merrs.NewError(e, merrs.SSMaps{{"filename": filename}, {"linecount": fmt.Sprint(doingline)}, {"line": line}})
				return
			}
			atomic.AddInt64(&donelines, doingline-lastlinecount)
			atomic.AddInt64(&doneblocks, 1)
			if logstatus {
				readinglines := doinglines[len(doinglines)-1]
				if doingline == doinglines[0] {
					importer.importstatus.mutex.Lock()
					importer.importstatus.ImportStatus[filename] = &ImportStatus{
						LinesCount:   doingline,
						RecordsCount: doingblock,
						RetryCount:   retrycount,
					}
					importer.importstatus.TotalUseTime = time.Since(importer.starttime)
					importer.importstatus.Save()
					savedlines = doingline
					savedblocks = doingblock
					doinglines = doinglines[1:]
					importer.importstatus.mutex.Unlock()
				} else {
					for i, l := range doinglines {
						if l == doingline {
							doinglines = append(doinglines[:i], doinglines[i+1:]...)
							break
						}
					}
				}
				importer.logInfo(filename, readinglines, doinglines, donelines, doneblocks, savedlines, savedblocks, retrycount)
			}
		})
		if e != nil {
			return linecount, blockcount, retrycount, merrs.NewError(e, merrs.SSMaps{{"filename": filename}, {"linecount": fmt.Sprint(linecount)}, {"line": line}})
		}
	}
}

func (importer *Importer) logInfo(filename string, readinglines int64, doinglines []int64, donelines, doneblocks, savedlines, savedblocks, retrycount int64) {
	if time.Since(importer.lastlogtime.GetIFPresent(filename)) > 5*time.Second {
		if odbc.LogDebug {
			if retrycount > 0 {
				logger.Info("file", filename, "read", readinglines, "lines,", "importing", len(doinglines), "chunks,", "imported", donelines, "lines", doneblocks, "records,", "saved", savedlines, "lines", savedblocks, "records", retrycount, "retry times")
			} else {
				logger.Info("file", filename, "read", readinglines, "lines,", "importing", len(doinglines), "chunks,", "imported", donelines, "lines", doneblocks, "records,", "saved", savedlines, "lines", savedblocks, "records")
			}
		} else {
			if retrycount > 0 {
				logger.Info("file", filename, "read", readinglines, "lines,", "importing", len(doinglines), "chunks,", "imported", donelines, "lines", doneblocks, "records", retrycount, "retry times")
			} else {
				logger.Info("file", filename, "read", readinglines, "lines,", "importing", len(doinglines), "chunks,", "imported", donelines, "lines", doneblocks, "records")
			}
		}
		importer.lastlogtime.Set(filename, time.Now())
	}
}

func (importer *Importer) importRecord(record map[string]any, line string, filename string, classaliasname string, linecount int) (retrycount int, err error) {
	if odbc.LogDebug {
		bs, e := json.MarshalIndent(record, "", "  ")
		if e != nil {
			return 0, merrs.NewError(e)
		}
		logger.Trace(fmt.Sprint("import ", filename, "[", linecount, "]:", string(bs)))
	}
	switch classaliasname {
	case schema.EDGE:
		graph.CacheEdgeInfo(record)
	default:
		retrycount, err = importer.odbcimporter.InsertData(classaliasname, record)
		if err != nil {
			err = merrs.NewError(err, merrs.SSMaps{{"filename": filename}, {"linecount": fmt.Sprint(linecount)}, {"line": line}})
			return
		}
	}
	return
}

func (importer *Importer) alldone() {
	importer.odbcimporter.alldone()
}

func (importer *Importer) done() {
	importer.odbcimporter.done()
}

func Check() {
	client := odbc.ODBClient
	if client == nil {
		return
	}
	{
		// mql := "select id,uniqueid,tags,contain,day,vtime from level1 where uniqueid='E2E:OTR0002L'"
		mql := "select * from level1 where uniqueid='E2E:OTR0002L'"
		r, e := client.Query(mql).Do()
		if e != nil {
			panic(merrs.NewError(e))
		}
		bs, _ := json.MarshalIndent(r.Data, "", "  ")
		fmt.Println(string(bs))
	}
	{
		mql := `match ("level1:E2E:OTR0002L")-[*]->(),("level1:E2E:OTR0002L")<-[*]-() with namespace="m3cnet", fields="uniqueid,distname" in "level1","level2"`
		r, e := client.Query(mql).Do()
		if e != nil {
			panic(merrs.NewError(e))
		}
		bs, _ := json.MarshalIndent(r.Data, "", "  ")
		fmt.Println(string(bs))
	}
}