import { format, formatDistanceToNow, isPast, isToday } from "date-fns";
import { X } from "lucide-react";
import { useBoardStore } from "@/stores/board-store";
import { CalendarPopover } from "@/components/card-detail/CalendarPopover";

interface DueDatePickerProps {
  cardId: string;
  dueDate: string | null;
}

export function DueDatePicker({ cardId, dueDate }: DueDatePickerProps) {
  const updateCard = useBoardStore((s) => s.updateCard);

  const dateObj = dueDate ? new Date(dueDate) : null;
  const overdue = dateObj != null && isPast(dateObj) && !isToday(dateObj);

  function handleSelect(date: Date) {
    updateCard(cardId, { dueDate: format(date, "yyyy-MM-dd") });
  }

  function handleClear() {
    updateCard(cardId, { dueDate: null });
  }

  return (
    <div className="flex flex-col gap-2">
      {/* Header with clear button */}
      <div className="flex items-center justify-between">
        <h4 className="font-mono text-xs uppercase tracking-widest text-pylon-text-secondary">
          Due Date
        </h4>
        {dueDate && (
          <button
            onClick={handleClear}
            className="rounded p-0.5 text-pylon-text-secondary transition-colors hover:bg-pylon-danger/10 hover:text-pylon-danger"
            aria-label="Clear due date"
          >
            <X className="size-3.5" />
          </button>
        )}
      </div>

      {/* Clickable date display -> opens calendar */}
      <CalendarPopover
        selectedDate={dateObj}
        onSelect={handleSelect}
        onClear={handleClear}
      >
        <button className="flex w-full items-center gap-2 rounded-md px-1 py-1 text-left transition-colors hover:bg-pylon-column/60">
          {dateObj ? (
            <>
              <span
                className={`text-sm font-medium ${
                  overdue ? "text-pylon-danger" : "text-pylon-text"
                }`}
              >
                {format(dateObj, "MMM d, yyyy")}
              </span>
              <span
                className={`text-xs ${
                  overdue ? "text-pylon-danger" : "text-pylon-text-secondary"
                }`}
              >
                {overdue
                  ? `overdue by ${formatDistanceToNow(dateObj)}`
                  : isToday(dateObj)
                    ? "today"
                    : `in ${formatDistanceToNow(dateObj)}`}
              </span>
            </>
          ) : (
            <span className="text-sm italic text-pylon-text-secondary/60">
              Click to set date...
            </span>
          )}
        </button>
      </CalendarPopover>
    </div>
  );
}