"use client";

import { useState, useMemo } from "react";
import Link from "next/link";
import {
  Pencil,
  Trash2,
  RefreshCw,
  Tv2,
  CalendarDays,
  Download,
  ChevronUp,
  ChevronDown,
} from "lucide-react";
import { Button } from "@/components/ui/button";
import { useActiveSchedule } from "@/hooks/use-channels";
import type { ChannelResponse } from "@/lib/types";
import { ConfirmDialog } from "./confirm-dialog";

interface ChannelCardProps {
  channel: ChannelResponse;
  isGenerating: boolean;
  isFirst: boolean;
  isLast: boolean;
  onEdit: () => void;
  onDelete: () => void;
  onGenerateSchedule: () => void;
  onViewSchedule: () => void;
  onExport: () => void;
  onMoveUp: () => void;
  onMoveDown: () => void;
}

function useScheduleStatus(channelId: string) {
  const { data: schedule } = useActiveSchedule(channelId);
  // eslint-disable-next-line react-hooks/purity -- Date.now() inside useMemo is stable enough for schedule status
  const now = useMemo(() => Date.now(), []);

  if (!schedule) return { status: "none" as const, label: null };

  const expiresAt = new Date(schedule.valid_until);
  const hoursLeft = (expiresAt.getTime() - now) / (1000 * 60 * 60);

  if (hoursLeft < 0) {
    return { status: "expired" as const, label: "Schedule expired" };
  }
  if (hoursLeft < 6) {
    const h = Math.ceil(hoursLeft);
    return { status: "expiring" as const, label: `Expires in ${h}h` };
  }
  const fmt = expiresAt.toLocaleDateString(undefined, {
    weekday: "short",
    hour: "2-digit",
    minute: "2-digit",
    hour12: false,
  });
  return { status: "ok" as const, label: `Until ${fmt}` };
}

export function ChannelCard({
  channel,
  isGenerating,
  isFirst,
  isLast,
  onEdit,
  onDelete,
  onGenerateSchedule,
  onViewSchedule,
  onExport,
  onMoveUp,
  onMoveDown,
}: ChannelCardProps) {
  const [confirmOpen, setConfirmOpen] = useState(false);
  const blockCount = Object.values(channel.schedule_config.day_blocks).reduce(
    (sum, blocks) => sum + blocks.length, 0
  );
  const { status, label } = useScheduleStatus(channel.id);

  const scheduleColor =
    status === "expired"
      ? "text-red-400"
      : status === "expiring"
        ? "text-amber-400"
        : status === "ok"
          ? "text-zinc-500"
          : "text-zinc-600";

  return (
    <div className="flex flex-col gap-4 rounded-xl border border-zinc-800 bg-zinc-900 p-5 transition-colors hover:border-zinc-700">
      {/* Top row */}
      <div className="flex items-start justify-between gap-3">
        <div className="min-w-0 space-y-1">
          <h2 className="truncate text-base font-semibold text-zinc-100">
            {channel.name}
          </h2>
          {channel.description && (
            <p className="line-clamp-2 text-sm text-zinc-500">
              {channel.description}
            </p>
          )}
        </div>

        <div className="flex shrink-0 items-center gap-1">
          {/* Order controls */}
          <div className="flex flex-col">
            <button
              onClick={onMoveUp}
              disabled={isFirst}
              title="Move up"
              className="rounded p-0.5 text-zinc-600 transition-colors hover:text-zinc-300 disabled:opacity-20 disabled:cursor-not-allowed"
            >
              <ChevronUp className="size-3.5" />
            </button>
            <button
              onClick={onMoveDown}
              disabled={isLast}
              title="Move down"
              className="rounded p-0.5 text-zinc-600 transition-colors hover:text-zinc-300 disabled:opacity-20 disabled:cursor-not-allowed"
            >
              <ChevronDown className="size-3.5" />
            </button>
          </div>

          <Button
            variant="ghost"
            size="icon-sm"
            onClick={onExport}
            title="Export as JSON"
            className="text-zinc-600 hover:text-zinc-200"
          >
            <Download className="size-3.5" />
          </Button>
          <Button
            variant="ghost"
            size="icon-sm"
            onClick={onEdit}
            title="Edit channel"
          >
            <Pencil className="size-3.5" />
          </Button>
          <Button
            variant="ghost"
            size="icon-sm"
            onClick={onDelete}
            title="Delete channel"
            className="text-zinc-600 hover:text-red-400"
          >
            <Trash2 className="size-3.5" />
          </Button>
        </div>
      </div>

      {/* Meta */}
      <div className="flex flex-wrap gap-x-4 gap-y-1 text-xs text-zinc-500">
        <span className="text-zinc-400">{channel.timezone}</span>
        <span>
          {blockCount} {blockCount === 1 ? "block" : "blocks"}
        </span>
        {label && <span className={scheduleColor}>{label}</span>}
      </div>

      {/* Actions */}
      <div className="flex gap-2">
        <Button
          size="sm"
          onClick={() => {
            if (status !== "none") {
              setConfirmOpen(true);
            } else {
              onGenerateSchedule();
            }
          }}
          disabled={isGenerating}
          className={`flex-1 ${status === "expired" ? "border border-red-800/50 bg-red-950/30 text-red-300 hover:bg-red-900/40" : ""}`}
        >
          <RefreshCw
            className={`size-3.5 ${isGenerating ? "animate-spin" : ""}`}
          />
          {isGenerating ? "Generating…" : "Generate schedule"}
        </Button>
        <Button
          size="icon-sm"
          onClick={onViewSchedule}
          title="View schedule"
        >
          <CalendarDays className="size-3.5" />
        </Button>
        <Button
          size="icon-sm"
          asChild
          title="Watch on TV"
        >
          <Link href={`/tv?channel=${channel.id}`}>
            <Tv2 className="size-3.5" />
          </Link>
        </Button>
      </div>
      <ConfirmDialog
        open={confirmOpen}
        onOpenChange={setConfirmOpen}
        title="Regenerate schedule?"
        description={
          <>
            <span className="font-medium text-zinc-200">{channel.name}</span>
            {" "}already has an active schedule. Generating a new one will overwrite it immediately.
          </>
        }
        confirmLabel="Regenerate"
        onConfirm={() => {
          setConfirmOpen(false);
          onGenerateSchedule();
        }}
      />
    </div>
  );
}