package db

import (
	"context"
	"errors"
	"fmt"
	"log/slog"
	"time"

	"gorm.io/gorm/logger"
	"zestack.dev/slim"
)

// TODO 支持租户隔离
func getLogger(ctx context.Context) *slog.Logger {
	if ctx != nil {
		l, ok := ctx.Value("db:logger").(*slim.Logger)
		if ok && l != nil {
			return l.Logger
		}
		k, ok := ctx.Value("db:logger").(*slog.Logger)
		if ok && k != nil {
			return k
		}
	}
	return slog.Default()
}

type dbLogger struct {
	SlowThreshold time.Duration
}

// LogMode log mode
func (l *dbLogger) LogMode(logger.LogLevel) logger.Interface {
	return l
}

// Info print info
func (l *dbLogger) Info(ctx context.Context, msg string, data ...any) {
	getLogger(ctx).Info(fmt.Sprintf(msg, data...))
}

// Warn print warn messages
func (l *dbLogger) Warn(ctx context.Context, msg string, data ...any) {
	getLogger(ctx).Warn(fmt.Sprintf(msg, data...))
}

// Error print error messages
func (l *dbLogger) Error(ctx context.Context, msg string, data ...any) {
	getLogger(ctx).Error(fmt.Sprintf(msg, data...))
}

// Trace print sql message
func (l *dbLogger) Trace(ctx context.Context, begin time.Time, fc func() (string, int64), err error) {
	elapsed := time.Since(begin)
	switch {
	case err != nil && !errors.Is(err, logger.ErrRecordNotFound):
		sql, rows := fc()
		if rows == -1 {
			l.Error(ctx, "%s [rows:%v] %s [%.3fms]", err, "-", sql, float64(elapsed.Nanoseconds())/1e6)
		} else {
			l.Error(ctx, "%s [rows:%v] %s [%.3fms]", err, rows, sql, float64(elapsed.Nanoseconds())/1e6)
		}
	case elapsed > l.SlowThreshold && l.SlowThreshold != 0:
		sql, rows := fc()
		slowLog := fmt.Sprintf("SLOW SQL >= %v", l.SlowThreshold)
		if rows == -1 {
			l.Warn(ctx, "%s [rows:%v] %s [%.3fms]", slowLog, "-", sql, float64(elapsed.Nanoseconds())/1e6)
		} else {
			l.Warn(ctx, "%s [rows:%v] %s [%.3fms]", slowLog, rows, sql, float64(elapsed.Nanoseconds())/1e6)
		}
	default:
		sql, rows := fc()
		if rows == -1 {
			l.Info(ctx, "[rows:%v] %s [%.3fms]", "-", sql, float64(elapsed.Nanoseconds())/1e6)
		} else {
			l.Info(ctx, "[rows:%v] %s [%.3fms]", rows, sql, float64(elapsed.Nanoseconds())/1e6)
		}
	}
}

func (l *dbLogger) ParamsFilter(_ context.Context, sql string, params ...any) (string, []any) {
	return sql, params
}