"use client";

import { useState } from "react";
import Link from "next/link";
import { AlertTriangle, Check, EllipsisVertical, X } from "lucide-react";
import { Button, buttonVariants } from "@/components/ui/button";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import { DueChip } from "@/components/task-status";
import { captureHref, INTENT_ICONS } from "@/lib/suggestions/labels";
import type { Suggestion } from "@/lib/suggestions/types";
import { TASK_PRIORITY_LABELS } from "@/lib/tasks/labels";
import { dueState } from "@/lib/tasks/today";
import { todayLocalIsoDate } from "@/lib/dates";
import { DueDateSheet } from "./due-date-sheet";

export interface SuggestionCardProps {
  suggestion: Suggestion;
  /** A decision for this very suggestion is running. */
  busy?: boolean;
  /** tasks:create - needed for „Übernehmen“ and every way to plan a task. */
  canAccept?: boolean;
  /** tasks:update - needed for „Verwerfen“. */
  canDismiss?: boolean;
  /** `dueDate` is undefined for the suggestion's own day, else YYYY-MM-DD. */
  onAccept: (suggestion: Suggestion, dueDate?: string) => void;
  onDismiss: (suggestion: Suggestion) => void;
  /** „Aufräumen“ for a CLEANUP suggestion; without a handler the button is not offered. */
  onCleanup?: (suggestion: Suggestion) => void;
}

type MenuAction = { label: string; sheetTitle: string; confirmLabel: string };

function menuActionOf(suggestion: Suggestion): MenuAction | null {
  if (suggestion.mode === "PLAN") {
    return { label: "Termin ändern", sheetTitle: "Termin ändern", confirmLabel: "Übernehmen" };
  }
  if (suggestion.intent === "CLEANUP") return null;
  return { label: "Als Aufgabe planen", sheetTitle: "Als Aufgabe planen", confirmLabel: "Aufgabe anlegen" };
}

function MainAction({ suggestion, busy, canAccept = true, onAccept, onCleanup }: SuggestionCardProps) {
  if (suggestion.intent === "CLEANUP") {
    if (!onCleanup) return null;
    return (
      <Button size="touch" disabled={busy} onClick={() => onCleanup(suggestion)}>
        <Check aria-hidden />
        Aufräumen
      </Button>
    );
  }
  if (suggestion.mode === "DO") {
    return (
      <Link
        href={captureHref(suggestion.intent, suggestion.colonyId)}
        className={buttonVariants({ size: "touch" })}
      >
        <Check aria-hidden />
        Erfassen
      </Link>
    );
  }
  if (!canAccept) return null;
  return (
    <Button size="touch" disabled={busy} onClick={() => onAccept(suggestion, undefined)}>
      <Check aria-hidden />
      Übernehmen
    </Button>
  );
}

export function SuggestionCard(props: SuggestionCardProps) {
  const { suggestion, busy, canAccept = true, canDismiss = true, onAccept, onDismiss } = props;
  const [now] = useState(() => new Date());
  const [isSheetOpen, setIsSheetOpen] = useState(false);
  const Icon = INTENT_ICONS[suggestion.intent];
  const menuAction = canAccept ? menuActionOf(suggestion) : null;
  const isUrgent = suggestion.priority === "HIGH" || suggestion.priority === "URGENT";

  return (
    <article className="flex flex-col gap-3 rounded-2xl border bg-card p-4 shadow-[var(--shadow-soft)]">
      <div className="flex items-start gap-3">
        <span className="flex size-10 shrink-0 items-center justify-center rounded-xl bg-primary/12 text-primary">
          <Icon className="size-5" aria-hidden />
        </span>
        <div className="flex min-w-0 flex-1 flex-col gap-1.5">
          <div className="flex flex-wrap items-center gap-x-2 gap-y-1">
            <h3
              tabIndex={-1}
              data-suggestion-heading={suggestion.id}
              className="font-medium outline-none focus-visible:ring-3 focus-visible:ring-ring/50"
            >
              {suggestion.title}
            </h3>
            {suggestion.colonyCode ? (
              <span className="rounded-full bg-muted px-2 py-0.5 text-xs font-medium">
                {suggestion.colonyCode}
              </span>
            ) : null}
          </div>
          {suggestion.reasons.length > 0 ? (
            <ul className="flex flex-col gap-0.5 text-sm text-muted-foreground">
              {suggestion.reasons.map((reason) => (
                <li key={reason}>{reason}</li>
              ))}
            </ul>
          ) : null}
          <div className="flex flex-wrap items-center gap-2">
            <DueChip state={dueState(suggestion, now)} dueDate={suggestion.dueDate} />
            {isUrgent ? (
              <span className="inline-flex items-center gap-1 rounded-full bg-warning/20 px-2 py-0.5 text-xs font-medium">
                <AlertTriangle className="size-3.5" aria-hidden />
                {TASK_PRIORITY_LABELS[suggestion.priority]}
              </span>
            ) : null}
          </div>
        </div>
      </div>
      <div className="flex flex-wrap items-center gap-2">
        <MainAction {...props} />
        {canDismiss ? (
          <Button
            size="touch"
            variant="ghost"
            disabled={busy}
            onClick={() => onDismiss(suggestion)}
          >
            <X aria-hidden />
            Verwerfen
          </Button>
        ) : null}
        {menuAction ? (
          <DropdownMenu>
            <DropdownMenuTrigger
              render={
                <Button
                  variant="ghost"
                  className="size-11"
                  disabled={busy}
                  aria-label="Weitere Aktionen"
                />
              }
            >
              <EllipsisVertical className="size-5" aria-hidden />
            </DropdownMenuTrigger>
            <DropdownMenuContent align="end">
              <DropdownMenuItem className="min-h-11" onClick={() => setIsSheetOpen(true)}>
                {menuAction.label}
              </DropdownMenuItem>
            </DropdownMenuContent>
          </DropdownMenu>
        ) : null}
      </div>
      {menuAction ? (
        <DueDateSheet
          open={isSheetOpen}
          onOpenChange={setIsSheetOpen}
          title={menuAction.sheetTitle}
          description={suggestion.title}
          confirmLabel={menuAction.confirmLabel}
          initialDate={suggestion.dueDate ?? todayLocalIsoDate()}
          onConfirm={(dueDate) => {
            setIsSheetOpen(false);
            onAccept(suggestion, dueDate);
          }}
        />
      ) : null}
    </article>
  );
}