package gormx

import (
	"context"
	"errors"
	"fmt"
	"time"
	"unicode/utf8"

	"git.yuntuo.hk/k2safe/go-omni/logx"
	"gorm.io/gorm"
	gormlog "gorm.io/gorm/logger"
)

type LogConfig struct {
	Level                string        `json:"level"`         // silent, error, warn (default), info
	SlowThreshold        time.Duration `json:"slowThreshold"` // zero disables slow-query events
	IgnoreRecordNotFound bool          `json:"ignoreRecordNotFound"`
	IncludeParameters    bool          `json:"includeParameters"`
	IncludeErrorDetails  bool          `json:"includeErrorDetails"`
	MaxSQLBytes          int           `json:"maxSqlBytes"` // zero uses 4096; bounds emitted SQL text
}

func DefaultLogConfig() LogConfig {
	return LogConfig{Level: "warn", SlowThreshold: 200 * time.Millisecond, IgnoreRecordNotFound: true, MaxSQLBytes: 4096}
}
func (c LogConfig) Validate() error {
	switch c.Level {
	case "", "silent", "error", "warn", "info":
	default:
		return errors.New("gormx: invalid SQL log level")
	}
	if c.SlowThreshold < 0 || c.MaxSQLBytes < 0 {
		return errors.New("gormx: SQL log limits cannot be negative")
	}
	return nil
}

type sqlLogger struct {
	logger *logx.Logger
	config LogConfig
	level  gormlog.LogLevel
}

// NewLogger adapts logx without changing its level, globals or ownership.
// Bound SQL arguments and raw driver error text are omitted by default. SQL
// literals written directly into a query are not parsed or redacted.
func NewLogger(logger *logx.Logger, config LogConfig) (gormlog.Interface, error) {
	if err := config.Validate(); err != nil {
		return nil, err
	}
	if config.MaxSQLBytes == 0 {
		config.MaxSQLBytes = 4096
	}
	level := gormlog.Warn
	switch config.Level {
	case "silent":
		level = gormlog.Silent
	case "error":
		level = gormlog.Error
	case "info":
		level = gormlog.Info
	}
	return &sqlLogger{logger: logger, config: config, level: level}, nil
}
func (l *sqlLogger) LogMode(level gormlog.LogLevel) gormlog.Interface {
	copy := *l
	if level < gormlog.Silent || level > gormlog.Info {
		level = gormlog.Silent
	}
	copy.level = level
	return &copy
}
func (l *sqlLogger) output(ctx context.Context) *logx.Logger {
	if l.logger != nil {
		return l.logger
	}
	return logx.FromContext(ctx)
}
func (l *sqlLogger) message(msg string, args []any) string {
	if !l.config.IncludeErrorDetails {
		copy := append([]any(nil), args...)
		for i, v := range copy {
			if e, ok := v.(error); ok {
				copy[i] = errorKind(e)
			}
		}
		args = copy
	}
	return clip(fmt.Sprintf(msg, args...), l.config.MaxSQLBytes)
}
func (l *sqlLogger) Info(ctx context.Context, msg string, args ...any) {
	if l.level >= gormlog.Info {
		l.output(ctx).InfoContext(ctx, "gorm.message", "message", l.message(msg, args))
	}
}
func (l *sqlLogger) Warn(ctx context.Context, msg string, args ...any) {
	if l.level >= gormlog.Warn {
		l.output(ctx).WarnContext(ctx, "gorm.message", "message", l.message(msg, args))
	}
}
func (l *sqlLogger) Error(ctx context.Context, msg string, args ...any) {
	if l.level >= gormlog.Error {
		l.output(ctx).ErrorContext(ctx, "gorm.message", "message", l.message(msg, args))
	}
}

func (l *sqlLogger) ParamsFilter(_ context.Context, query string, args ...any) (string, []any) {
	if !l.config.IncludeParameters {
		return query, nil
	}
	return query, args
}
func (l *sqlLogger) Trace(ctx context.Context, begin time.Time, fc func() (string, int64), err error) {
	if l.level == gormlog.Silent {
		return
	}
	elapsed := time.Since(begin)
	failure := err != nil && !(l.config.IgnoreRecordNotFound && errors.Is(err, gorm.ErrRecordNotFound))
	slow := l.config.SlowThreshold > 0 && elapsed > l.config.SlowThreshold
	level := gormlog.Info
	if failure && l.level >= gormlog.Error {
		level = gormlog.Error
	} else if slow && l.level >= gormlog.Warn {
		level = gormlog.Warn
	} else if l.level < gormlog.Info {
		return
	}
	query, rows := fc()
	attrs := []any{"durationMs", float64(elapsed) / float64(time.Millisecond), "rowsAffected", rows, "sql", clip(query, l.config.MaxSQLBytes)}
	if level == gormlog.Error {
		attrs = append(attrs, "errorKind", errorKind(err))
		if l.config.IncludeErrorDetails {
			attrs = append(attrs, "error", clip(err.Error(), l.config.MaxSQLBytes))
		}
	}
	logger := l.output(ctx)
	switch level {
	case gormlog.Error:
		logger.ErrorContext(ctx, "gorm.queryFailed", attrs...)
	case gormlog.Warn:
		logger.WarnContext(ctx, "gorm.slowQuery", attrs...)
	default:
		logger.InfoContext(ctx, "gorm.query", attrs...)
	}
}
func errorKind(err error) string {
	switch {
	case errors.Is(err, context.Canceled):
		return "canceled"
	case errors.Is(err, context.DeadlineExceeded):
		return "deadlineExceeded"
	case errors.Is(err, gorm.ErrRecordNotFound):
		return "recordNotFound"
	default:
		return fmt.Sprintf("%T", err)
	}
}
func clip(value string, limit int) string {
	if len(value) <= limit {
		return value
	}
	value = value[:limit]
	for !utf8.ValidString(value) && len(value) > 0 {
		value = value[:len(value)-1]
	}
	return value + "…"
}

var _ gormlog.Interface = (*sqlLogger)(nil)
var _ gorm.ParamsFilter = (*sqlLogger)(nil)