package canal

import (
	"strconv"
	"time"

	"github.com/juju/errors"
	"github.com/siddontang/go-mysql/dump"
	"github.com/siddontang/go-mysql/mysql"
	"github.com/siddontang/go-mysql/schema"
	log "github.com/sirupsen/logrus"
)

type dumpParseHandler struct {
	c    *Canal
	name string
	pos  uint64
}

func (h *dumpParseHandler) BinLog(name string, pos uint64) error {
	h.name = name
	h.pos = pos
	return nil
}

func (h *dumpParseHandler) Data(db string, table string, values []string) error {
	if err := h.c.ctx.Err(); err != nil {
		return err
	}

	tableInfo, err := h.c.GetTable(db, table)
	if err != nil {
		e := errors.Cause(err)
		if e == ErrExcludedTable ||
			e == schema.ErrTableNotExist ||
			e == schema.ErrMissingTableMeta {
			return nil
		}
		log.Errorf("get %s.%s information err: %v", db, table, err)
		return errors.Trace(err)
	}

	vs := make([]interface{}, len(values))

	for i, v := range values {
		if v == "NULL" {
			vs[i] = nil
		} else if v[0] != '\'' {
			if tableInfo.Columns[i].Type == schema.TYPE_NUMBER {
				n, err := strconv.ParseInt(v, 10, 64)
				if err != nil {
					log.Errorf("parse row %v at %d error %v, skip", values, i, err)
					return dump.ErrSkip
				}
				vs[i] = n
			} else if tableInfo.Columns[i].Type == schema.TYPE_FLOAT {
				f, err := strconv.ParseFloat(v, 64)
				if err != nil {
					log.Errorf("parse row %v at %d error %v, skip", values, i, err)
					return dump.ErrSkip
				}
				vs[i] = f
			} else {
				log.Errorf("parse row %v error, invalid type at %d, skip", values, i)
				return dump.ErrSkip
			}
		} else {
			vs[i] = v[1 : len(v)-1]
		}
	}

	events := newRowsEvent(tableInfo, InsertAction, [][]interface{}{vs})
	return h.c.eventHandler.OnRow(events)
}

func (c *Canal) AddDumpDatabases(dbs ...string) {
	if c.dumper == nil {
		return
	}

	c.dumper.AddDatabases(dbs...)
}

func (c *Canal) AddDumpTables(db string, tables ...string) {
	if c.dumper == nil {
		return
	}

	c.dumper.AddTables(db, tables...)
}

func (c *Canal) AddDumpIgnoreTables(db string, tables ...string) {
	if c.dumper == nil {
		return
	}

	c.dumper.AddIgnoreTables(db, tables...)
}

func (c *Canal) tryDump() error {
	pos := c.master.Position()
	gtid := c.master.GTID()
	if (len(pos.Name) > 0 && pos.Pos > 0) || gtid != nil {
		// we will sync with binlog name and position
		log.Infof("skip dump, use last binlog replication pos %s or GTID %s", pos, gtid)
		return nil
	}

	if c.dumper == nil {
		log.Info("skip dump, no mysqldump")
		return nil
	}

	h := &dumpParseHandler{c: c}

	if c.cfg.Dump.SkipMasterData {
		pos, err := c.GetMasterPos()
		if err != nil {
			return errors.Trace(err)
		}
		log.Infof("skip master data, get current binlog position %v", pos)
		h.name = pos.Name
		h.pos = uint64(pos.Pos)
	}

	start := time.Now()
	log.Info("try dump MySQL and parse")
	if err := c.dumper.DumpAndParse(h); err != nil {
		return errors.Trace(err)
	}

	log.Infof("dump MySQL and parse OK, use %0.2f seconds, start binlog replication at (%s, %d)",
		time.Now().Sub(start).Seconds(), h.name, h.pos)

	pos = mysql.Position{h.name, uint32(h.pos)}
	c.master.Update(pos)
	c.eventHandler.OnPosSynced(pos, true)
	return nil
}