"use client";

/**
 * PostGridCard — square card used in the 2-per-row grid view.
 *
 *   • With image: first attached image fills the card; a bottom-up dark
 *     gradient makes the caption legible without dropping the image's
 *     atmosphere.
 *   • Without image: a palette-aware Tailwind gradient stands in; the
 *     caption sits as a serif quote bottom-left in the foreground colour.
 *
 * `onDelete` shows a small X in the corner for owner views. Used both for
 * actual post deletion (on /u/me) and for removing from a collection
 * (on /u/me/collections/[id]); the parent decides which.
 */

import { useState } from "react";
import Image from "next/image";
import Link from "next/link";
import { ImageIcon, X } from "lucide-react";
import { cn } from "@/lib/utils";
import type { Post } from "@/lib/social";
import { displaySourceLabel } from "@/lib/source-reference";
import { useMediaQuery } from "@/components/selection-toolbar/shared";
import { postSourceHref, quoteCardBgStyle, quoteSize } from "./post-card-shared";
import { UpdateBackgroundModal } from "./update-background-modal";

export function PostGridCard({
  post,
  onDelete,
  onUpdated,
  href: hrefProp,
}: {
  post: Post;
  onDelete?: (id: string) => void;
  /** Owner-only: shown when defined so the user can swap/remove the
   *  card's background image. */
  onUpdated?: (updated: Post) => void;
  /** Override the click target. Defaults to the source-passage URL.
   *  Profile grids pass a `/u/<handle>/posts#post-<id>` anchor so the
   *  thumbnail jumps to the Instagram-style scroll feed instead of the
   *  knowledgebase page. */
  href?: string;
}) {
  const isMobile = useMediaQuery("(max-width: 767px)");
  const [bgModal, setBgModal] = useState(false);
  const firstImage = post.images?.[0]?.url;
  const href = hrefProp ?? postSourceHref(post);
  const size = quoteSize(post.caption, "grid");
  // Image variant always anchors text bottom-left over the image's dark
  // overlay. No-image variant lets `size.alignment` decide — short quotes
  // sit centred so the gradient frames them; long quotes fall back to
  // bottom-left so they don't cover the whole card.
  const bottomLeft = !!firstImage || size.alignment === "bottom-left";

  return (
    <div className="relative group select-none">
      <Link
        href={href}
        className={cn(
          "block aspect-square rounded-2xl overflow-hidden ring-1 ring-foreground/10",
          "hover:ring-foreground/25 hover:shadow-md transition-all relative",
        )}
      >
        {firstImage ? (
          <>
            <Image
              src={firstImage}
              alt=""
              fill
              sizes="(max-width: 640px) 50vw, 320px"
              className="object-cover"
              unoptimized
            />
            {/* Full-coverage scrim — even the top of the card carries enough
                darkness (~40%) so white text overlaid anywhere stays
                legible without looking blended with the image. */}
            <div className="absolute inset-0 bg-gradient-to-t from-black/95 via-black/70 to-black/40" />
          </>
        ) : (
          <div className="absolute inset-0" style={quoteCardBgStyle()} />
        )}

        <div
          className={cn(
            "absolute inset-0 flex flex-col p-4 sm:p-5",
            // Text color: white on the dark image overlay, theme
            // foreground on the flat quote-card background.
            firstImage ? "text-white" : "text-foreground",
            bottomLeft
              ? "justify-end items-start text-left"
              : "justify-center items-center text-center",
          )}
        >
          <p
            className={cn(
              "font-[family-name:var(--font-title)] leading-snug break-words",
              size.fontClass,
              size.clampClass,
              // Drop-shadow only helps when text sits on imagery; on the
              // flat bg it just blurs the type.
              firstImage && "drop-shadow-sm",
              // Centred quotes need a soft horizontal cap so a long line
              // doesn't kiss the card edge — looks better with margins.
              !bottomLeft ? "max-w-[90%]" : "w-full",
            )}
          >
            “{post.caption}”
          </p>
          <p
            className={cn(
              "mt-2 text-[0.65rem] uppercase tracking-[0.2em] font-medium truncate",
              firstImage ? "text-white/80" : "text-muted-foreground",
              bottomLeft ? "w-full" : "max-w-[90%]",
            )}
          >
            {displaySourceLabel(post.source_url, post.source_title)}
          </p>
        </div>
      </Link>

      {onUpdated || onDelete ? (
        <div className="absolute top-2 right-2 flex items-center gap-1.5 opacity-0 group-hover:opacity-100 focus-within:opacity-100 transition-opacity">
          {onUpdated ? (
            <button
              type="button"
              onClick={() => setBgModal(true)}
              aria-label="Update background"
              title="Update background"
              className="size-8 rounded-full inline-flex items-center justify-center bg-black/40 text-white hover:bg-black/60 transition-colors"
            >
              <ImageIcon className="size-4" />
            </button>
          ) : null}
          {onDelete ? (
            <button
              type="button"
              onClick={() => onDelete(post.id)}
              aria-label="Remove"
              className="size-8 rounded-full inline-flex items-center justify-center bg-black/40 text-white hover:bg-black/60 transition-colors"
            >
              <X className="size-4" />
            </button>
          ) : null}
        </div>
      ) : null}

      {onUpdated ? (
        <UpdateBackgroundModal
          open={bgModal}
          onClose={() => setBgModal(false)}
          post={post}
          isMobile={isMobile}
          onUpdated={onUpdated}
        />
      ) : null}
    </div>
  );
}