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package reports
import (
"fmt"
"strings"
"time"
)
type DateRange struct {
Start time.Time
End time.Time
}
func ParseDateRange(dateStr string) (DateRange, error) {
dateStr = strings.TrimSpace(dateStr)
now := time.Now().UTC()
// Check for predefined ranges (case-insensitive)
lowerDateStr := strings.ToLower(dateStr)
switch lowerDateStr {
case "last week":
return getLastWeek(now), nil
case "last month":
return getLastMonth(now), nil
}
// Check for custom date range format: "YYYY-MM-DD to YYYY-MM-DD"
if strings.Contains(dateStr, " to ") {
return parseCustomDateRange(dateStr)
}
return DateRange{}, fmt.Errorf("unsupported date range: %s (supported: 'last week', 'last month', or 'YYYY-MM-DD to YYYY-MM-DD')", dateStr)
}
func parseCustomDateRange(dateStr string) (DateRange, error) {
parts := strings.Split(dateStr, " to ")
if len(parts) != 2 {
return DateRange{}, fmt.Errorf("invalid date range format: expected 'YYYY-MM-DD to YYYY-MM-DD'")
}
startStr := strings.TrimSpace(parts[0])
endStr := strings.TrimSpace(parts[1])
// Parse start date
startDate, err := time.Parse("2006-01-02", startStr)
if err != nil {
return DateRange{}, fmt.Errorf("invalid start date '%s': expected YYYY-MM-DD format", startStr)
}
// Parse end date
endDate, err := time.Parse("2006-01-02", endStr)
if err != nil {
return DateRange{}, fmt.Errorf("invalid end date '%s': expected YYYY-MM-DD format", endStr)
}
// Validate that start date is before or equal to end date
if startDate.After(endDate) {
return DateRange{}, fmt.Errorf("start date '%s' must be before or equal to end date '%s'", startStr, endStr)
}
// Convert to UTC and set times appropriately
// Start date: beginning of day (00:00:00)
startUTC := time.Date(startDate.Year(), startDate.Month(), startDate.Day(), 0, 0, 0, 0, time.UTC)
// End date: end of day (23:59:59.999999999)
endUTC := time.Date(endDate.Year(), endDate.Month(), endDate.Day(), 23, 59, 59, 999999999, time.UTC)
return DateRange{
Start: startUTC,
End: endUTC,
}, nil
}
func getLastWeek(now time.Time) DateRange {
// Find the start of current week (Monday)
weekday := int(now.Weekday())
if weekday == 0 { // Sunday
weekday = 7
}
// Start of current week
currentWeekStart := now.AddDate(0, 0, -(weekday-1)).Truncate(24 * time.Hour)
// Last week is the week before current week
lastWeekStart := currentWeekStart.AddDate(0, 0, -7)
lastWeekEnd := currentWeekStart.Add(-time.Nanosecond)
return DateRange{
Start: lastWeekStart,
End: lastWeekEnd,
}
}
func getLastMonth(now time.Time) DateRange {
// Start of current month
currentMonthStart := time.Date(now.Year(), now.Month(), 1, 0, 0, 0, 0, time.UTC)
// Last month start
lastMonthStart := currentMonthStart.AddDate(0, -1, 0)
// Last month end (last nanosecond of last month)
lastMonthEnd := currentMonthStart.Add(-time.Nanosecond)
return DateRange{
Start: lastMonthStart,
End: lastMonthEnd,
}
}
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