package main

import (
	"archive/zip"
	"bytes"
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"strconv"
	"strings"
	"time"

	tb "gopkg.in/tucnak/telebot.v2"
)

func createJob(jobTypeID int32, priority int32, userID64 int64, schedule time.Time, payload []byte) (int64, error) {
	stmt, err := db.Prepare(`INSERT INTO obj (obj_type_id, obj_sub_type_id)
								 VALUES 	 (?          , ?);`)
	logOnError(err, "createJob : prepare insert obj")
	if err != nil {
		return 0, err
	}
	defer stmt.Close()

	res, err := stmt.Exec(objTypeJob, jobTypeID)
	s := fmt.Sprintf("createJob, insert obj(%d, %d)", objTypeJob, jobTypeID)
	logOnError(err, s)
	if err != nil {
		return 0, err
	}

	objId, err := res.LastInsertId()
	logOnError(err, "createJob : get last insert Id")
	if err != nil {
		return 0, err
	}

	stmt, err = db.Prepare(`INSERT INTO obj_job	(obj_id, priority, user_id, status, seq_nr, schedule, is_done, in_work, inserted, pulled, started, ended,  payload)
								 VALUES 		(?,      ?,        ?,       ?,      NULL,   ?,        0,       0,       ?,        NULL,   NULL,    NULL, ?);`)
	logOnError(err, "createJob : prepare insert obj_job")
	if err != nil {
		return 0, err
	}
	defer stmt.Close()

	_, err = stmt.Exec(objId, priority, userID64, objJobStatusNew, schedule.UTC(), time.Now().UTC(), payload)
	logOnError(err, "createJob : insert obj_job")
	if err != nil {
		return 0, err
	}

	return objId, nil
}

func setJobDone(jobId int64) error {
	stmt, err := db.Prepare(`UPDATE obj_job j SET j.is_done = 1, j.in_work = 0, j.ended = ? WHERE j.obj_id = ?;`)
	logOnError(err, "setJobDone : prepare update obj_job")
	if err != nil {
		return err
	}
	defer stmt.Close()

	_, err = stmt.Exec(time.Now().UTC(), jobId)
	s := fmt.Sprintf("setJobDone, update obj_job(%d)", jobId)
	logOnError(err, s)
	if err != nil {
		return err
	}
	return nil
}

func setJobStart(jobId int64) error {
	stmt, err := db.Prepare(`UPDATE obj_job j SET j.started = coalesce(j.started, ?) WHERE j.obj_id = ?;`)
	logOnError(err, "setJobStart : prepare update obj_job")
	if err != nil {
		return err
	}
	defer stmt.Close()

	_, err = stmt.Exec(time.Now().UTC(), jobId)
	s := fmt.Sprintf("setJobStart, update obj_job(%d)", jobId)
	logOnError(err, s)
	if err != nil {
		return err
	}
	return nil
}

func rescheduleJob(jobID64 int64, status int32, schedule time.Time) error {
	stmt, err := db.Prepare(`UPDATE obj_job j SET j.is_done = 0, j.in_work = 0, j.schedule = ?, j.status = ? WHERE j.obj_id = ?;`)
	logOnError(err, "rescheduleJob : prepare update obj_job")
	if err != nil {
		return err
	}
	defer stmt.Close()

	_, err = stmt.Exec(schedule.UTC(), status, jobID64)
	s := fmt.Sprintf("rescheduleJob, update obj_job(%d)", jobID64)
	logOnError(err, s)
	if err != nil {
		return err
	}
	return nil
}

func loadCurrentJobs() ([]Job, error) {
	var (
		objId     int64
		jobTypeId int32
		userID64  int64
		status    int32
		payload   []byte
		jobs      []Job
	)

	t := time.Now().UTC()
	r := RndInt64()

	_, err := db.Exec("UPDATE obj_job j SET j.pulled = ?, j.in_work = 1, j.seq_nr = ? WHERE j.is_done = 0 AND j.in_work = 0 AND j.schedule <= ? ORDER BY j.priority ASC, j.obj_id ASC LIMIT ?;", t, r, t, SQLJobSliceSize)
	logOnError(err, "loadCurrentJobs : update intial rows")

	stmt, err := db.Prepare("SELECT o.id, o.obj_sub_type_id, j.status, j.user_id, j.payload FROM obj_job j, obj o WHERE j.obj_id = o.id AND j.is_done = 0 AND j.in_work = 1 AND j.seq_nr = ? ORDER BY j.priority ASC, j.obj_id ASC;")
	logOnError(err, "loadCurrentJobs : prepare select statement")

	rows, err := stmt.Query(r)
	//	rows, err := stmt.Query(time.Now())
	logOnError(err, "loadCurrentJobs : query select statement")

	for rows.Next() {
		err = rows.Scan(&objId, &jobTypeId, &status, &userID64, &payload)
		logOnError(err, "loadCurrentJobs : scan query rows")
		job := Job{
			ID64:      objId,
			JobTypeID: jobTypeId,
			Status:    status,
			UserID64:  userID64,
			Payload:   payload,
		}
		jobs = append(jobs, job)
	}
	err = rows.Err()
	logOnError(err, "loadCurrentJobs : scan end rows")
	rows.Close()

	err = stmt.Close()
	logOnError(err, "loadCurrentJobs : close select statement")

	return jobs, nil
}

func jobRescan(j Job) {
	var p JobPayloadRescanMsg

	err := setJobStart(j.ID64)
	logOnError(err, "jobRescan : setJobStart")

	err = json.Unmarshal(j.Payload, &p)
	logOnError(err, "jobRescan : Unmarshal payload")

	start := time.Now()
	milestone := time.Now()

	ids := getSQLListID64(p.Query)

	if len(ids) > 1 {
		txt := fmt.Sprintf("Rescanning %d messages.", len(ids))
		m := TGCommand{
			Type:         commandReplyMsg,
			Text:         txt,
			FromMsgID64:  p.MsgID64,
			FromChatID64: p.ChatID64,
		}
		TGCmdQueue <- m

		i := 0
		for _, id := range ids {
			SQLMsgIdentifyQueue <- id

			i = i + 1
			if time.Now().After(milestone.Add(1 * time.Minute)) {
				//txt := fmt.Sprintf("Rescanned %d/%d messages.", i, len(ids))
				m = TGCommand{
					Type:         commandReplyMsg,
					Text:         fmt.Sprintf("Rescanned %d/%d messages.", i, len(ids)),
					FromMsgID64:  p.MsgID64,
					FromChatID64: p.ChatID64,
				}
				TGCmdQueue <- m
				milestone = time.Now()
			}

		}

		r := JobPayloadSetDone{
			JobID64:  j.ID64,
			MsgID64:  p.MsgID64,
			ChatID64: p.ChatID64,
			Text:     fmt.Sprintf("%d messages processed in %s.", len(ids), time.Since(start)),
		}
		b, _ := json.Marshal(r)
		_, err := createJob(objSubTypeJobSetJobDone, objJobPriorityRescanAllMsg, j.UserID64, time.Now().UTC(), b)
		logOnError(err, "jobRescan : createJob(objSubTypeJobSetJobDone)")

	} else if len(ids) == 1 {
		SQLMsgIdentifyQueue <- ids[0]
		err = setJobDone(j.ID64)
		logOnError(err, "jobRescan : setJobDone(1)")
		if p.MsgID64 != 0 || p.ChatID64 != 0 {
			m := TGCommand{
				Type:         commandReplyMsg,
				Text:         "One message processed.",
				FromMsgID64:  p.MsgID64,
				FromChatID64: p.ChatID64,
			}
			TGCmdQueue <- m
		}
	} else {
		err = setJobDone(j.ID64)
		logOnError(err, "jobRescan : setJobDone(0)")
		if p.MsgID64 != 0 || p.ChatID64 != 0 {
			m := TGCommand{
				Type:         commandReplyMsg,
				Text:         "No message processed.",
				FromMsgID64:  p.MsgID64,
				FromChatID64: p.ChatID64,
			}
			TGCmdQueue <- m
		}
	}
	return
}

func jobSetDone(j Job) {
	var r JobPayloadSetDone

	err := setJobStart(j.ID64)
	logOnError(err, "jobSetDone : setJobStart")

	err = json.Unmarshal(j.Payload, &r)
	logOnError(err, "jobSetDone : Unmarshal payload")

	err = setJobDone(r.JobID64)
	logOnError(err, "jobSetDone : setJobDone(child)")

	err = setJobDone(j.ID64)
	logOnError(err, "jobSetDone : setJobDone")

	m := TGCommand{
		Type:         commandReplyMsg,
		Text:         r.Text,
		FromMsgID64:  r.MsgID64,
		FromChatID64: r.ChatID64,
	}
	TGCmdQueue <- m

	return
}

func jobPillage(j Job) {
	var r JobPayloadPillage

	err := setJobStart(j.ID64)
	logOnError(err, "jobPillage : setJobStart")

	err = json.Unmarshal(j.Payload, &r)
	logOnError(err, "jobPillage : Unmarshal payload")

	// check if we have a acknoledgment of go or a timeout within 3m30 of the PillageInc from the Job
	ids := getSQLListID64(`	select ox.id
						      from obj ox
							      ,obj_msg omx
								  ,obj op
		                          ,obj_msg omp
		                          ,obj_job oj
		                     where oj.obj_id = ` + strconv.FormatInt(j.ID64, 10) + `
		                       and omx.user_id = oj.user_id
		                       and omx.sender_user_id = ` + strconv.Itoa(userID64ChtWrsBot) + `
		                       and omx.obj_id = ox.id
		                       and ox.obj_sub_type_id in (` + strconv.Itoa(objSubTypeMessagePillageGo) +
		`, ` + strconv.Itoa(objSubTypeMessagePillageTimeout) +
		`, ` + strconv.Itoa(objSubTypeMessagePillageLoss) +
		`, ` + strconv.Itoa(objSubTypeMessagePillageWin) + `)
		                       and op.id = ` + strconv.FormatInt(r.ObjID64, 10) + `
		                       and omp.obj_id = op.id
		                       and omx.date between omp.date and addtime(omp.date, '0 0:3:30.000000')
		                     order by case ox.obj_sub_type_id when ` + strconv.Itoa(objSubTypeMessagePillageWin) + ` then 0
		                                                      when ` + strconv.Itoa(objSubTypeMessagePillageLoss) + ` then 1
		                                                      when ` + strconv.Itoa(objSubTypeMessagePillageTimeout) + ` then 2
		                                                      when ` + strconv.Itoa(objSubTypeMessagePillageGo) + ` then 3
		                                                      else 4 end asc
		                     limit 1;`)

	if len(ids) > 1 { // issue there ?
		s := TGCommand{
			Type:       commandSendMsg,
			Text:       fmt.Sprintf("More than one outcome for pillage #%d", r.ObjID64),
			ToUserID64: j.UserID64,
		}
		TGCmdQueue <- s
	} else if len(ids) == 1 { // we've got a match, job is done whether we prevented the pillage or not
		m, err := getObjMsg(ids[0])
		logOnError(err, "jobPillage : getMsg(objSubTypeMessagePillageGo, objSubTypeMessagePillageTimeout)")
		if err == nil {
			if m.Date.Add(60 * time.Second).After(time.Now().UTC()) {
				msgTypeID64, err := getObjSubTypeId(ids[0])
				logOnError(err, "jobPillage : getObjSubTypeId")
				if err == nil {
					if msgTypeID64 == objSubTypeMessagePillageGo {
						s := TGCommand{
							Type:       commandSendMsg,
							Text:       fmt.Sprintf("We avoided a pillage (%s)", m.Date.Format(time.RFC3339)),
							ToUserID64: j.UserID64,
						}
						TGCmdQueue <- s
					} else if msgTypeID64 == objSubTypeMessagePillageWin {
						s := TGCommand{
							Type:       commandSendMsg,
							Text:       fmt.Sprintf("We avoided a pillage (%s))", m.Date.Format(time.RFC3339)),
							ToUserID64: j.UserID64,
						}
						TGCmdQueue <- s
					} else if msgTypeID64 == objSubTypeMessagePillageLoss {
						s := TGCommand{
							Type:       commandSendMsg,
							Text:       fmt.Sprintf("We got pillaged (%s)", m.Date.Format(time.RFC3339)),
							ToUserID64: j.UserID64,
						}
						TGCmdQueue <- s
					} else if msgTypeID64 == objSubTypeMessagePillageTimeout {
						s := TGCommand{
							Type:       commandSendMsg,
							Text:       fmt.Sprintf("We got pillaged (%s)", m.Date.Format(time.RFC3339)),
							ToUserID64: j.UserID64,
						}
						TGCmdQueue <- s
					} else {
						s := TGCommand{
							Type:       commandSendMsg,
							Text:       fmt.Sprintf("We don't know what happened (%s)", m.Date.Format(time.RFC3339)),
							ToUserID64: j.UserID64,
						}
						TGCmdQueue <- s
					}
				}
			}
		}
		err = setJobDone(j.ID64)
		logOnError(err, "jobSetDone : setJobDone")
		return
	}

	s := TGCommand{
		Type:       commandSendMsg,
		Text:       fmt.Sprintf("No outcome for the pillage yet"),
		ToUserID64: j.UserID64,
	}
	TGCmdQueue <- s

	//no outcome yet, have we sent a "/go" in the last 30 sec ?
	ids = getSQLListID64(`	select ox.id
						      from obj ox
							      ,obj_msg omx
		                          ,obj_job oj
		                     where oj.obj_id = ` + strconv.FormatInt(j.ID64, 10) + `
		                       and omx.user_id = oj.user_id
		                       and omx.sender_user_id = oj.user_id
		                       and omx.obj_id = ox.id
		                       and ox.obj_sub_type_id =` + strconv.Itoa(objSubTypeMessageGo) + `
		                       and omx.date between addtime(oj.schedule, '-30') and oj.schedule;`)

	if len(ids) > 0 { // we did, so we reschedule the job to check the outcome and wait
		m, err := getObjMsg(ids[0])
		logOnError(err, "jobPillage : getMsg(objSubTypeMessageGo)")
		if err == nil {
			s := TGCommand{
				Type:       commandSendMsg,
				Text:       fmt.Sprintf("We started intercepting the pillage (%s)", m.Date.Format(time.RFC3339)),
				ToUserID64: j.UserID64,
			}
			TGCmdQueue <- s
		}
		err = rescheduleJob(j.ID64, j.Status+1, time.Now().Add(30*time.Second).UTC())
		logOnError(err, "jobPillage : rescheduleJob(objSubTypeMessageGo)")
	} else { //no /go in the last 30 sec so we go ahead, send one and reschedule to check again in 25sec
		clientSendCWMsg(j.UserID64, "/go")
		err = rescheduleJob(j.ID64, j.Status+1, time.Now().Add(30*time.Second).UTC())
		logOnError(err, "jobPillage : rescheduleJob")

	}

	return
}

func jobMsgRefresh(j Job) {
	var p JobPayloadMsgRefresh

	// identify whether the message has been properly refreshed ? create new job ? reschedule same job ?
	err := setJobStart(j.ID64)
	logOnError(err, "jobMsgRefresh : setJobStart")

	err = json.Unmarshal(j.Payload, &p)
	logOnError(err, "jobMsgRefresh : Unmarshal payload")

	m, err := getObjMsg(p.ObjID64)

	if err != nil && strings.Compare(err.Error(), `sql: no rows in result set`) == 0 {
		err = setJobDone(j.ID64)
		logOnError(err, "joMsgClient : setJobDone")
		return
	} else {
		logOnError(err, "jobMsgRefresh : getObjMsg")
		err = setJobDone(j.ID64)
		logOnError(err, "joMsgClient : setJobDone")
		return
	}

	err = delObj(p.ObjID64)
	logOnError(err, "jobMsgRefresh : delObj")

	clientRefreshCWMsg(m.UserID64, m.ChatID64, m.ID64)

	err = setJobDone(j.ID64)
	logOnError(err, "joMsgClient : setJobDone")
	return
}

func jobMsgClient(j Job) {
	var p JobPayloadMsgClient
	err := setJobStart(j.ID64)
	logOnError(err, "jobMsgClient : setJobStart")

	err = json.Unmarshal(j.Payload, &p)
	logOnError(err, "jobMsgClient : Unmarshal payload")

	if err == nil {
		clientSendCWMsg(j.UserID64, p.Text)
		m := TGCommand{
			Type:         commandReplyMsg,
			Text:         "Message sent.",
			FromMsgID64:  p.MsgID64,
			FromChatID64: p.ChatID64,
		}
		TGCmdQueue <- m
	}

	err = setJobDone(j.ID64)
	logOnError(err, "joMsgClient : setJobDone")
	return
}

func jobBackupExport(j Job) {
	var p JobPayloadBackupExport
	err := setJobStart(j.ID64)
	logOnError(err, "jobBackupExport : setJobStart")

	err = json.Unmarshal(j.Payload, &p)
	logOnError(err, "jobBackupExport : Unmarshal payload")

	bkp := DataBackup{}
	start := time.Now()
	milestone := time.Now()

	s := new([]ChatWarsMessage)
	msgs := *s
	ids := getSQLListID64(`SELECT om.obj_id id FROM obj_msg om;`)

	txt := fmt.Sprintf("Backing up %d messages.", len(ids))
	m := TGCommand{
		Type:         commandReplyMsg,
		Text:         txt,
		FromMsgID64:  p.MsgID64,
		FromChatID64: p.ChatID64,
	}
	TGCmdQueue <- m

	i := 0
	for _, id := range ids {
		msg, err := getObjMsg(id)
		logOnError(err, "jobBackupExport : getMsg")
		if err == nil {
			msgs = append(msgs, *msg)
		}
		i = i + 1
		if time.Now().After(milestone.Add(1 * time.Minute)) {
			txt := fmt.Sprintf("Exported %d/%d messages.", i, len(ids))
			m = TGCommand{
				Type:         commandReplyMsg,
				Text:         txt,
				FromMsgID64:  p.MsgID64,
				FromChatID64: p.ChatID64,
			}
			TGCmdQueue <- m
			milestone = time.Now()
		}
	}

	bkp.Messages = msgs
	b, err := json.Marshal(bkp)
	logOnError(err, "jobBackupExport : Marshal")

	m = TGCommand{
		Type:         commandReplyMsg,
		Text:         `Compressing archive`,
		FromMsgID64:  p.MsgID64,
		FromChatID64: p.ChatID64,
	}
	TGCmdQueue <- m

	zbuf := new(bytes.Buffer)
	zw := zip.NewWriter(zbuf)
	zf, err := zw.Create(`backup.json`)
	logOnError(err, "jobBackupExport : Create")

	_, err = zf.Write(b)
	logOnError(err, "jobBackupExport : Write")

	err = zw.Close()
	logOnError(err, "jobBackupExport : Close")

	d := tb.Document{}
	d.File = tb.FromReader(bytes.NewReader(zbuf.Bytes()))
	d.FileName = fmt.Sprintf("%s.backup.zip", start.Format("20060102150405"))
	d.Caption = d.FileName
	d.MIME = `application/zip`

	m = TGCommand{
		Type:         commandReplyMsg,
		Text:         `Export done.`,
		FromMsgID64:  p.MsgID64,
		FromChatID64: p.ChatID64,
	}
	TGCmdQueue <- m

	m = TGCommand{
		Type:       commandSendDocument,
		Document:   d,
		ToChatID64: p.ChatID64,
	}
	TGCmdQueue <- m

	err = setJobDone(j.ID64)
	logOnError(err, "jobBackupExport : setJobDone")
	return
}

func jobBackupImport(j Job) {
	var p JobPayloadBackupImport
	err := setJobStart(j.ID64)
	logOnError(err, "jobBackupImport : setJobStart")

	err = json.Unmarshal(j.Payload, &p)
	logOnError(err, "jobBackupImport : Unmarshal payload")

	resp, err := http.Get(p.URL)
	logOnError(err, "jobBackupImport : Get")
	defer resp.Body.Close()

	buf := new(bytes.Buffer)
	buf.ReadFrom(resp.Body)

	m := TGCommand{
		Type:         commandReplyMsg,
		Text:         "File downloaded.",
		FromMsgID64:  p.MsgID64,
		FromChatID64: p.ChatID64,
	}
	TGCmdQueue <- m

	z := buf.Bytes()
	r := bytes.NewReader(z)
	zr, err := zip.NewReader(r, int64(len(z)))

	for _, f := range zr.File {
		if strings.Compare(f.Name, "backup.json") == 0 {
			rc, err := f.Open()
			logOnError(err, "jobBackupImport : Open")
			if err != nil {
				return
			}
			data, err := ioutil.ReadAll(rc)
			logOnError(err, "jobBackupImport : ReadAll")
			if err != nil {
				return
			}
			log.Printf("jobBackupImport : %d uncompressed bytes.\n", len(data))
			rc.Close()
			bkp := DataBackup{}
			err = json.Unmarshal(data, &bkp)
			logOnError(err, "jobBackupImport : Unmarshal")
			if err != nil {
				return
			}
			for _, msg := range bkp.Messages {
				MQCWMsgQueue <- msg
			}

			m := TGCommand{
				Type:         commandReplyMsg,
				Text:         "Backup restored.",
				FromMsgID64:  p.MsgID64,
				FromChatID64: p.ChatID64,
			}
			TGCmdQueue <- m

			err = setJobDone(j.ID64)
			logOnError(err, "jobBackupImport : setJobDone")
			return
		}
	}

	m = TGCommand{
		Type:         commandReplyMsg,
		Text:         "Not backup file found in archive.",
		FromMsgID64:  p.MsgID64,
		FromChatID64: p.ChatID64,
	}
	TGCmdQueue <- m

	err = setJobDone(j.ID64)
	logOnError(err, "jobBackupImport : setJobDone")
	return
}