package importer

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

	"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
}

type ImportStatus struct {
	RecordsCount int64
}

type CGIStatus struct {
	mutex        sync.RWMutex
	TotalUseTime time.Duration
	ImportStatus map[string]*ImportStatus
	rc           *rc.RoutinesController
	lasterror    error
	lastsavetime time.Time
	waitdone     chan any
}

var cgistatusfile = mcfg.GetString("cgi.statusfile", "/opt/matrix/var/cgimport.status.txt")

func NewCGIStatus() *CGIStatus {
	return &CGIStatus{
		ImportStatus: map[string]*ImportStatus{},
		rc:           rc.NewRoutinesController("", 1),
		waitdone:     make(chan any, 1),
	}
}

func (cgistatus *CGIStatus) Load() error {
	cgistatusbs, e := os.ReadFile(cgistatusfile)
	if e != nil && !os.IsNotExist(e) {
		return e
	}
	if len(cgistatusbs) > 0 {
		e = json.Unmarshal(cgistatusbs, &cgistatus)
		if e != nil {
			logger.Warn(e)
		}
	}
	return nil
}

func (cgistatus *CGIStatus) WaitSaveDone() {
	cgistatus.waitdone <- 1
	cgistatus.rc.WaitDone()
}

func (cgistatus *CGIStatus) Save() (err error) {
	cgistatus.rc.CallLast2Only(func() {
		if !cgistatus.lastsavetime.Equal(time.Time{}) {
			interval := time.Since(cgistatus.lastsavetime)
			if interval < 1*time.Second {
				t := time.NewTimer(1*time.Second - interval)
				select {
				case <-t.C:
				case v := <-cgistatus.waitdone:
					cgistatus.waitdone <- v
				}
			}
		}
		cgistatus.mutex.RLock()
		cgistatusbs, e := json.MarshalIndent(cgistatus, "", "  ")
		cgistatus.mutex.RUnlock()
		if e != nil {
			cgistatus.lasterror = e
			return
		}
		e = os.MkdirAll(filepath.Dir(cgistatusfile), os.ModePerm)
		if e != nil {
			cgistatus.lasterror = e
			return
		}
		e = os.WriteFile(cgistatusfile, cgistatusbs, os.ModePerm)
		if e != nil {
			cgistatus.lasterror = e
			return
		}
		cgistatus.lastsavetime = time.Now()
		// fmt.Println(cgistatus.lastsavetime)
	})
	return cgistatus.lasterror
}

func ImportDir(datapath string, parallel int) (totalfilescount, totalrecordscount int64, totalusetime time.Duration, filescount, recordscount int64, usetime time.Duration, err error) {
	importer := &Importer{
		datapath:     datapath,
		parallel:     parallel,
		importrc:     rc.NewRoutinesController("", 100),
		odbcimporter: NewODBCImporter(),
	}
	return importer.Import()
}

func (importer *Importer) Import() (totalfilescount, totalrecordscount int64, totalusetime time.Duration, filescount, recordscount int64, usetime time.Duration, err error) {
	var cgirc = rc.NewRoutinesController("", importer.parallel)
	var wg sync.WaitGroup
	fw, e := filewalker.NewFileWalker([]string{importer.datapath}, ".*")
	if e != nil {
		err = e
		return
	}
	cgistatus := NewCGIStatus()
	reload := mcfg.GetString("reload")
	if false && reload == "" {
		e = cgistatus.Load()
		if e != nil {
			err = e
			return
		}
	} else {
		e = importer.odbcimporter.reload()
		if e != nil {
			err = e
			return
		}
	}
	totalfilescount = int64(len(cgistatus.ImportStatus))
	for _, v := range cgistatus.ImportStatus {
		totalrecordscount += v.RecordsCount
	}
	totalusetime = cgistatus.TotalUseTime
	st := time.Now().Add(-totalusetime)
	cst := time.Now()
	// 遍历文件目录
	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()
				cgistatus.mutex.RLock()
				importstatus := cgistatus.ImportStatus[filename]
				cgistatus.mutex.RUnlock()
				if importstatus != nil {
					return
				}
				records, e := importer.ImportFile(filename)
				if e != nil {
					err = e
					return
				}
				atomic.AddInt64(&filescount, 1)
				atomic.AddInt64(&recordscount, records)
				atomic.AddInt64(&totalfilescount, 1)
				atomic.AddInt64(&totalrecordscount, records)
				usetime = time.Since(cst)
				totalusetime = time.Since(st)
				cgistatus.mutex.Lock()
				cgistatus.ImportStatus[filename] = &ImportStatus{RecordsCount: records}
				cgistatus.TotalUseTime = totalusetime
				cgistatus.mutex.Unlock()
				cgistatus.Save()
			},
		)
		return true
	})
	wg.Wait()
	if e != nil {
		err = e
		return
	}
	cgistatus.WaitSaveDone()
	importer.alldone()
	return
}

func (importer *Importer) ImportFile(filepath string) (blockcount int64, 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 int64, 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 importer.done()
	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
			}
			atomic.AddInt64(&blockcount, 1)
		})
		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) {
	if odbc.LogDebug {
		bs, e := json.MarshalIndent(record, "", "  ")
		if e != nil {
			return e
		}
		logger.Debug(fmt.Sprint("import ", filename, "[", linecount, "]:", string(bs)))
	}
	var classname string
	classname, e := importer.odbcimporter.ReviseClassStruct(record)
	if e != nil {
		return e
	}
	e = importer.odbcimporter.InsertData(classname, record)
	if e != nil {
		return e
	}
	return
}

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

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