package timeparse

import (
	"fmt"
	"strings"
	"time"

	"gitea.maximumdirect.net/ejr/weatherapi/internal/platform/constants"
)

func ParseTimestamp(raw string) (time.Time, error) {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return time.Time{}, fmt.Errorf("timestamp is required")
	}

	var lastErr error
	for _, layout := range constants.SupportedTimestampLayouts {
		ts, err := time.Parse(layout, raw)
		if err == nil {
			return ts, nil
		}
		lastErr = err
	}

	if lastErr == nil {
		lastErr = fmt.Errorf("invalid timestamp")
	}
	return time.Time{}, fmt.Errorf("timestamp must be RFC3339 (example: 2026-03-17T12:30:00Z): %w", lastErr)
}