package domain

import (
	"database/sql/driver"
	"encoding/json"
	"fmt"
	"strconv"
	"strings"
	"time"
)

type Duration struct {
	time.Duration
}

func (d Duration) MarshalJSON() ([]byte, error) {
	return json.Marshal(d.Duration.String())
}

func (d *Duration) UnmarshalJSON(b []byte) error {
	var s string
	if err := json.Unmarshal(b, &s); err != nil {
		return err
	}

	duration, err := time.ParseDuration(s)
	if err != nil {
		return err
	}

	d.Duration = duration
	return nil
}

func (d Duration) Value() (driver.Value, error) {
	return int64(d.Duration), nil
}

func (d *Duration) Scan(value interface{}) error {
	if value == nil {
		d.Duration = 0
		return nil
	}

	switch v := value.(type) {
	case int64:
		d.Duration = time.Duration(v)
	case string:
		duration, err := time.ParseDuration(v)
		if err != nil {
			return err
		}
		d.Duration = duration
	case []uint8:
		// Handle PostgreSQL interval format (e.g., "8333333:20:00")
		intervalStr := string(v)

		// Try parsing as Go duration first
		if duration, err := time.ParseDuration(intervalStr); err == nil {
			d.Duration = duration
			return nil
		}

		// If that fails, try parsing PostgreSQL interval format
		// Convert PostgreSQL interval "HH:MM:SS" to Go duration
		if strings.Contains(intervalStr, ":") {
			parts := strings.Split(intervalStr, ":")
			if len(parts) >= 2 {
				// Parse hours, minutes, seconds format
				var hours, minutes, seconds int64
				var err error

				// Handle the case where we might have days as well (e.g., "8333333:20:00")
				// or just hours:minutes:seconds
				switch len(parts) {
				case 2: // MM:SS
					minutes, err = parseNumber(parts[0])
					if err != nil {
						return fmt.Errorf("cannot parse minutes from interval: %s", intervalStr)
					}
					seconds, err = parseNumber(parts[1])
					if err != nil {
						return fmt.Errorf("cannot parse seconds from interval: %s", intervalStr)
					}
				case 3: // HH:MM:SS
					hours, err = parseNumber(parts[0])
					if err != nil {
						return fmt.Errorf("cannot parse hours from interval: %s", intervalStr)
					}
					minutes, err = parseNumber(parts[1])
					if err != nil {
						return fmt.Errorf("cannot parse minutes from interval: %s", intervalStr)
					}
					seconds, err = parseNumber(parts[2])
					if err != nil {
						return fmt.Errorf("cannot parse seconds from interval: %s", intervalStr)
					}
				default:
					return fmt.Errorf("unsupported interval format: %s", intervalStr)
				}

				// Convert to duration
				totalSeconds := hours*3600 + minutes*60 + seconds
				d.Duration = time.Duration(totalSeconds) * time.Second
				return nil
			}
		}

		return fmt.Errorf("cannot parse PostgreSQL interval format: %s", intervalStr)
	default:
		return fmt.Errorf("cannot scan %T into Duration", value)
	}

	return nil
}

func ParseDuration(s string) (Duration, error) {
	if s == "" {
		return Duration{}, fmt.Errorf("empty duration string")
	}

	s = strings.TrimSpace(s)

	duration, err := time.ParseDuration(s)
	if err != nil {
		return Duration{}, fmt.Errorf("failed to parse duration '%s': %v", s, err)
	}

	return Duration{Duration: duration}, nil
}

func (d Duration) String() string {
	return d.Duration.String()
}

func (d Duration) Seconds() float64 {
	return d.Duration.Seconds()
}

func (d Duration) Minutes() float64 {
	return d.Duration.Minutes()
}

func (d Duration) Hours() float64 {
	return d.Duration.Hours()
}

// Helper function to parse number from string, handling potential whitespace
func parseNumber(s string) (int64, error) {
	s = strings.TrimSpace(s)
	return strconv.ParseInt(s, 10, 64)
}