package logger

import (
	"context"
	"errors"
	"fmt"
	"git.nspix.com/golang/micro/log"
	"gorm.io/gorm/logger"
	"gorm.io/gorm/utils"
	"time"
)

type Logger struct {
	LogLevel      logger.LogLevel
	SlowThreshold time.Duration
	traceStr      string
	traceErrStr   string
}

func (lg *Logger) LogMode(level logger.LogLevel) logger.Interface {
	lg.LogLevel = level
	return lg
}

func (lg *Logger) Info(ctx context.Context, s string, i ...interface{}) {
	if lg.LogLevel >= logger.Info {
		log.Infof(s, i...)
	}
}

func (lg *Logger) Warn(ctx context.Context, s string, i ...interface{}) {
	if lg.LogLevel >= logger.Warn {
		log.Warnf(s, i...)
	}
}

func (lg *Logger) Error(ctx context.Context, s string, i ...interface{}) {
	if lg.LogLevel >= logger.Error {
		log.Errorf(s, i...)
	}
}

func (lg *Logger) Trace(ctx context.Context, begin time.Time, fc func() (sql string, rowsAffected int64), err error) {
	if lg.LogLevel <= logger.Silent {
		return
	}
	elapsed := time.Since(begin)
	switch {
	case err != nil && lg.LogLevel >= logger.Error && (!errors.Is(err, logger.ErrRecordNotFound)):
		sql, rows := fc()
		if rows == -1 {
			lg.Warn(ctx, lg.traceErrStr, sql, err, float64(elapsed.Nanoseconds())/1e6, "-", utils.FileWithLineNum())
		} else {
			lg.Warn(ctx, lg.traceErrStr, sql, err, float64(elapsed.Nanoseconds())/1e6, rows, utils.FileWithLineNum())
		}
	case elapsed > lg.SlowThreshold && lg.SlowThreshold != 0 && lg.LogLevel >= logger.Warn:
		sql, rows := fc()
		slowLog := fmt.Sprintf("SLOW SQL >= %v", lg.SlowThreshold)
		if rows == -1 {
			lg.Warn(ctx, lg.traceErrStr, sql, slowLog, float64(elapsed.Nanoseconds())/1e6, "-", utils.FileWithLineNum())
		} else {
			lg.Warn(ctx, lg.traceErrStr, sql, slowLog, float64(elapsed.Nanoseconds())/1e6, rows, utils.FileWithLineNum())
		}
	case lg.LogLevel == logger.Info:
		sql, rows := fc()
		if rows == -1 {
			lg.Info(ctx, lg.traceStr, sql, float64(elapsed.Nanoseconds())/1e6, "-", utils.FileWithLineNum())
		} else {
			lg.Info(ctx, lg.traceStr, sql, float64(elapsed.Nanoseconds())/1e6, rows, utils.FileWithLineNum())
		}
	}
}

func New() *Logger {
	return &Logger{
		SlowThreshold: time.Second * 10,
		traceStr:      "%s [%.3fms] [rows:%v] in %s",
		traceErrStr:   "%s [%s] [%.3fms] [rows:%v] in %s",
	}
}