package ted

import (
	"fmt"
	"strconv"
	"strings"
	"time"
	"tm/internal/notice"
)

// parseDate parses various date formats used in TED XML
func ParseDate(dateStr string) (time.Time, error) {
	if dateStr == "" {
		return time.Time{}, fmt.Errorf("empty date string")
	}

	// Common TED date formats
	formats := []string{
		"2006-01-02+07:00",
		"2006-01-02-07:00",
		"2006-01-02T15:04:05+07:00",
		"2006-01-02T15:04:05-07:00",
		"2006-01-02T15:04:05Z",
		"2006-01-02Z",
		"2006-01-02",
		time.RFC3339,
		time.RFC3339Nano,
	}

	for _, format := range formats {
		if parsedTime, err := time.Parse(format, dateStr); err == nil {
			return parsedTime, nil
		}
	}

	return time.Time{}, fmt.Errorf("unable to parse date: %s", dateStr)
}

// parseDateToUnixMilli converts string date to Unix milliseconds (int64)
func ParseDateToUnix(dateStr string) int64 {
	if dateStr == "" {
		return 0
	}

	if parsedTime, err := ParseDate(dateStr); err == nil {
		return parsedTime.Unix()
	}

	return 0
}

// parseTimeToUnix converts string time to Unix milliseconds (int64)
func ParseTimeToUnix(timeStr string) int64 {
	if timeStr == "" {
		return 0
	}

	// If time string is just time without date, use today's date
	if !strings.Contains(timeStr, "T") && !strings.Contains(timeStr, " ") {
		// Assume it's just a time like "15:04:05"
		today := time.Now().Format("2006-01-02")
		timeStr = fmt.Sprintf("%sT%s", today, timeStr)
	}

	if parsedTime, err := ParseDate(timeStr); err == nil {
		return parsedTime.Unix()
	}

	return 0
}

// unixToDateString converts Unix to date string for TenderID generation
func UnixToDateString(unix int64) string {
	if unix == 0 {
		return "00000000"
	}

	return time.Unix(unix, 0).Format("20060102")
}

func CalculateSubmissionDeadline(publicationDate time.Time) time.Time {
	deadline := publicationDate
	workingHoursAdded := 0

	for workingHoursAdded < 48 {
		deadline = deadline.Add(1 * time.Hour)

		if deadline.Weekday() != time.Saturday && deadline.Weekday() != time.Sunday {
			workingHoursAdded++
		}
	}

	return deadline
}

func CalculateApplicationDeadline(tenderDeadline time.Time) time.Time {
	applicationDeadline := tenderDeadline
	workingDaysSubtracted := 0

	for workingDaysSubtracted < 7 {
		applicationDeadline = applicationDeadline.AddDate(0, 0, -1)

		if applicationDeadline.Weekday() != time.Saturday && applicationDeadline.Weekday() != time.Sunday {
			workingDaysSubtracted++
		}
	}

	return applicationDeadline
}

// padOrTruncate pads a string with zeros or truncates it to the specified length
func PadOrTruncate(str string, length int) string {
	// Remove any non-alphanumeric characters and convert to uppercase
	clean := strings.ToUpper(strings.ReplaceAll(str, "-", ""))
	clean = strings.ReplaceAll(clean, " ", "")

	if len(clean) >= length {
		return clean[:length]
	}

	// Pad with zeros
	return clean + strings.Repeat("0", length-len(clean))
}

// generateTenderURL generates the TED tender URL from NoticePublicationID
func GenerateTenderURL(noticePublicationID string) string {
	if noticePublicationID == "" {
		return ""
	}

	// Remove leading zeros and format for URL
	// Example: 00522942-2025 -> https://ted.europa.eu/en/notice/-/detail/522942-2025
	parts := strings.Split(noticePublicationID, "-")
	if len(parts) != 2 {
		return ""
	}

	// Convert to int and back to string to remove leading zeros
	if num, err := strconv.Atoi(parts[0]); err == nil {
		cleanID := fmt.Sprintf("%d-%s", num, parts[1])
		return fmt.Sprintf("https://ted.europa.eu/en/notice/-/detail/%s", cleanID)
	}

	return ""
}

// generateTenderID generates a unique tender ID using the format:
// {Source}{BUYER_CODE}{TED_CODE}{DATE}{LOCATION_CODE}
func GenerateTenderID(t *notice.Notice) string {
	var parts []string

	// Source (TED)
	parts = append(parts, "1")

	// TED code (Notice Publication ID, first 8 chars)
	tedCode := "00000000"
	if t.NoticePublicationID != "" {
		tedCode = PadOrTruncate(t.NoticePublicationID, 8)
	}
	parts = append(parts, tedCode)

	// Buyer code (first 8 chars of buyer organization ID, or 8 zeros if not available)
	// buyerCode := "00000000"
	// if t.BuyerOrganization != nil && t.BuyerOrganization.ID != "" {
	// 	buyerCode = padOrTruncate(t.BuyerOrganization.ID, 8)
	// }
	// parts = append(parts, buyerCode)

	// Date (YYYYMMDD format from issue date)
	parts = append(parts, PadOrTruncate(UnixToDateString(t.IssueDate), 4))

	// Location code (country code + region code, padded to 6 chars)
	locationCode := "EU"
	if t.CountryCode != "" {
		locationCode = t.CountryCode
	}
	parts = append(parts, locationCode)

	return strings.Join(parts, "")
}