"use client";

import Image from "next/image";
import Link from "next/link";
import { useRouter } from "next/navigation";
import { FormEvent, useCallback, useEffect, useState } from "react";
import ClothesShell from "@/components/clothes/ClothesShell";
import IconButton, {
  ClearFilterIcon,
  EditIcon,
  FilterIcon,
  MetaTagsIcon,
  TrashIcon,
} from "@/components/ui/IconButton";
import Modal, { FormModal } from "@/components/ui/Modal";
import Pagination, { usePagination } from "@/components/ui/Pagination";
import { BlogPost, formatBlogDate } from "@/data/blog";
import { ApiError } from "@/lib/api";
import { deleteBlog, fetchBlogs, updateBlog } from "@/lib/blog-api";
import { useConfirm } from "@/components/ui/ConfirmDialog";

const PAGE_SIZE = 3;

type Filters = {
  name: string;
  dateFrom: string;
  dateTo: string;
};

const emptyFilters: Filters = {
  name: "",
  dateFrom: "",
  dateTo: "",
};

export default function BlogListPage() {
  const router = useRouter();
  const confirmDialog = useConfirm();
  const [items, setItems] = useState<BlogPost[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [draft, setDraft] = useState<Filters>(emptyFilters);
  const [applied, setApplied] = useState<Filters>(emptyFilters);
  const [detailPost, setDetailPost] = useState<BlogPost | null>(null);
  const [metaPost, setMetaPost] = useState<BlogPost | null>(null);
  const [metaTitle, setMetaTitle] = useState("");
  const [metaDescription, setMetaDescription] = useState("");
  const [metaKeywords, setMetaKeywords] = useState("");
  const [savingMeta, setSavingMeta] = useState(false);

  const reload = useCallback(async () => {
    setLoading(true);
    setError(null);
    try {
      setItems(await fetchBlogs());
    } catch (err) {
      setError(
        err instanceof ApiError ? err.message : "بارگذاری بلاگ ناموفق بود.",
      );
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => {
    void reload();
  }, [reload]);

  const list = items.filter((post) => {
    const q = applied.name.trim();
    const matchesName =
      !q ||
      post.title.includes(q) ||
      post.author.includes(q) ||
      post.abstract.includes(q);

    const fromOk = !applied.dateFrom || post.date >= applied.dateFrom;
    const toOk = !applied.dateTo || post.date <= applied.dateTo;

    return matchesName && fromOk && toOk;
  });

  const { page, setPage, pageItems, totalPages, totalItems, pageSize } =
    usePagination(list, PAGE_SIZE, JSON.stringify(applied));

  function openMeta(post: BlogPost) {
    setMetaPost(post);
    setMetaTitle(post.metaTitle);
    setMetaDescription(post.metaDescription);
    setMetaKeywords(post.metaKeywords);
  }

  function closeMeta() {
    setMetaPost(null);
  }

  async function saveMeta(event: FormEvent<HTMLFormElement>) {
    event.preventDefault();
    if (!metaPost) return;
    setSavingMeta(true);
    setError(null);
    try {
      const updated = await updateBlog(metaPost.id, {
        metaTitle: metaTitle.trim() || null,
        metaDescription: metaDescription.trim() || null,
      });
      setItems((prev) =>
        prev.map((post) =>
          post.id === metaPost.id
            ? { ...updated, metaKeywords: metaKeywords.trim() }
            : post,
        ),
      );
      closeMeta();
    } catch (err) {
      setError(
        err instanceof ApiError ? err.message : "ذخیره متا ناموفق بود.",
      );
    } finally {
      setSavingMeta(false);
    }
  }

  async function removePost(id: string) {
    if (!(await confirmDialog("این مطلب حذف شود؟"))) return;
    setError(null);
    try {
      await deleteBlog(id);
      setItems((prev) => prev.filter((post) => post.id !== id));
    } catch (err) {
      setError(
        err instanceof ApiError ? err.message : "حذف مطلب ناموفق بود.",
      );
    }
  }

  return (
    <>
      <ClothesShell
        eyebrow="Blog"
        title="بلاگ"
        description="مطالب بلاگ را فیلتر کنید و متا تگ‌ها را مدیریت کنید."
        breadcrumbs={[
          { label: "داشبورد", href: "/" },
          { label: "بلاگ" },
        ]}
        plusHref="/blog/new"
        plusLabel="مطلب جدید"
      >
        <div className="mb-3 flex flex-wrap gap-2">
          <Link
            href="/blog/categories"
            className="border border-line bg-white px-4 py-2 text-sm text-ink transition-colors hover:border-ink"
          >
            مدیریت دسته‌بندی‌ها
          </Link>
        </div>
        {error ? (
          <p className="mb-2 rounded-lg border border-line bg-surface px-4 py-3 text-sm text-ink">
            {error}
          </p>
        ) : null}

        <section className="clothes-filter-bar mb-2 dash-enter">
          <div className="clothes-field">
            <label htmlFor="filter-blog-name">نام</label>
            <input
              id="filter-blog-name"
              value={draft.name}
              onChange={(e) =>
                setDraft((prev) => ({ ...prev, name: e.target.value }))
              }
              placeholder="عنوان، نویسنده..."
            />
          </div>
          <div className="clothes-field">
            <label htmlFor="filter-blog-from">از تاریخ</label>
            <input
              id="filter-blog-from"
              type="date"
              dir="ltr"
              value={draft.dateFrom}
              onChange={(e) =>
                setDraft((prev) => ({ ...prev, dateFrom: e.target.value }))
              }
            />
          </div>
          <div className="clothes-field">
            <label htmlFor="filter-blog-to">تا تاریخ</label>
            <input
              id="filter-blog-to"
              type="date"
              dir="ltr"
              value={draft.dateTo}
              onChange={(e) =>
                setDraft((prev) => ({ ...prev, dateTo: e.target.value }))
              }
            />
          </div>

          <div className="clothes-filter-actions">
            <IconButton
              label="اعمال فیلتر"
              variant="solid"
              onClick={() => setApplied(draft)}
            >
              <FilterIcon />
            </IconButton>
            <IconButton
              label="حذف فیلتر"
              variant="line"
              onClick={() => {
                setDraft(emptyFilters);
                setApplied(emptyFilters);
              }}
            >
              <ClearFilterIcon />
            </IconButton>
          </div>
        </section>

        {loading ? (
          <p className="text-sm text-muted">در حال بارگذاری...</p>
        ) : (
          <>
            <div className="space-y-1">
              {pageItems.map((post, i) => (
                <article
                  key={post.id}
                  className="blog-card dash-enter cursor-pointer"
                  style={{ animationDelay: `${70 + i * 45}ms` }}
                  onClick={() => setDetailPost(post)}
                >
                  <div className="blog-card-image">
                    <Image
                      src={post.image}
                      alt={post.title}
                      fill
                      unoptimized
                      sizes="180px"
                      className="object-cover"
                    />
                  </div>

                  <div className="min-w-0 flex-1">
                    <div className="flex flex-wrap items-baseline gap-x-3 gap-y-1">
                      <h2 className="text-base text-ink sm:text-lg">
                        {post.title}
                      </h2>
                      <time
                        dateTime={post.date}
                        dir="ltr"
                        className="text-xs tabular-nums text-muted"
                      >
                        {formatBlogDate(post.date)}
                      </time>
                    </div>
                    <p className="mt-1 text-sm text-muted">
                      {post.categoryName
                        ? `${post.categoryName} · ${post.author}`
                        : post.author}
                    </p>
                    <p className="mt-2 line-clamp-2 text-sm leading-6 text-ink/80">
                      {post.abstract}
                    </p>
                    {post.tags.length ? (
                      <div className="mt-2 flex flex-wrap gap-1.5">
                        {post.tags.map((tag) => (
                          <span
                            key={tag}
                            className="tag-chip !rounded-md !py-0.5"
                          >
                            {tag}
                          </span>
                        ))}
                      </div>
                    ) : null}
                  </div>

                  <div
                    className="tree-row-actions shrink-0"
                    onClick={(e) => e.stopPropagation()}
                  >
                    <IconButton
                      label="ویرایش"
                      variant="line"
                      onClick={() => router.push(`/blog/new?edit=${post.id}`)}
                    >
                      <EditIcon />
                    </IconButton>
                    <IconButton
                      label="متا تگ"
                      variant="line"
                      onClick={() => openMeta(post)}
                    >
                      <MetaTagsIcon />
                    </IconButton>
                    <IconButton
                      label="حذف"
                      variant="line"
                      onClick={() => void removePost(post.id)}
                    >
                      <TrashIcon />
                    </IconButton>
                  </div>
                </article>
              ))}

              {list.length === 0 ? (
                <p className="rounded-lg border border-line bg-surface px-4 py-8 text-center text-sm text-muted">
                  مطلبی با این فیلترها پیدا نشد.
                </p>
              ) : null}
            </div>

            {list.length > 0 ? (
              <Pagination
                page={page}
                totalPages={totalPages}
                totalItems={totalItems}
                pageSize={pageSize}
                onChange={setPage}
              />
            ) : null}
          </>
        )}
      </ClothesShell>

      <Modal
        open={Boolean(detailPost)}
        title="جزئیات مطلب"
        subtitle={detailPost?.title || "Post details"}
        onClose={() => setDetailPost(null)}
        wide="full"
        footer={
          <button
            type="button"
            className="modal-btn-ghost"
            onClick={() => setDetailPost(null)}
          >
            بستن
          </button>
        }
      >
        {detailPost ? (
          <div className="grid grid-cols-1 gap-5 lg:grid-cols-[280px_1fr]">
            <div className="space-y-3">
              <div className="relative mx-auto aspect-[3/2] w-full max-w-[280px] overflow-hidden rounded-md bg-[#f3f3f1] lg:max-w-none">
                <Image
                  src={detailPost.image}
                  alt={detailPost.title}
                  fill
                  unoptimized
                  sizes="280px"
                  className="object-cover"
                />
              </div>
            </div>

            <div className="space-y-4 text-start">
              <div>
                <h3 className="text-xl text-ink sm:text-2xl">
                  {detailPost.title}
                </h3>
                <p className="mt-1 text-sm text-muted">
                  <time dateTime={detailPost.date} dir="ltr">
                    {formatBlogDate(detailPost.date)}
                  </time>
                  {detailPost.author ? ` · ${detailPost.author}` : null}
                </p>
              </div>

              <dl className="grid grid-cols-1 gap-3 text-sm sm:grid-cols-2">
                <div>
                  <dt className="text-xs text-muted">دسته‌بندی</dt>
                  <dd className="mt-0.5 text-ink">
                    {detailPost.categoryName || "—"}
                  </dd>
                </div>
                <div>
                  <dt className="text-xs text-muted">نویسنده</dt>
                  <dd className="mt-0.5 text-ink">
                    {detailPost.author || "—"}
                  </dd>
                </div>
              </dl>

              {detailPost.abstract ? (
                <div>
                  <p className="mb-1 text-xs text-muted">خلاصه</p>
                  <p className="text-sm leading-7 text-ink/90 whitespace-pre-wrap">
                    {detailPost.abstract}
                  </p>
                </div>
              ) : null}

              {detailPost.body ? (
                <div>
                  <p className="mb-1 text-xs text-muted">متن</p>
                  <div
                    className="blog-detail-body text-sm leading-7 text-ink/90"
                    dangerouslySetInnerHTML={{ __html: detailPost.body }}
                  />
                </div>
              ) : null}

              {detailPost.tags.length ? (
                <div>
                  <p className="mb-1.5 text-xs text-muted">برچسب‌ها</p>
                  <div className="flex flex-wrap gap-1.5">
                    {detailPost.tags.map((tag) => (
                      <span key={tag} className="tag-chip !rounded-md !py-0.5">
                        {tag}
                      </span>
                    ))}
                  </div>
                </div>
              ) : null}
            </div>
          </div>
        ) : null}
      </Modal>

      <FormModal
        open={Boolean(metaPost)}
        title="متا تگ‌ها"
        subtitle="SEO title and description for this post"
        onClose={closeMeta}
        onSubmit={saveMeta}
        submitLabel={savingMeta ? "..." : "ذخیره متا"}
      >
        <div className="clothes-field">
          <label htmlFor="meta-title">Meta Title</label>
          <input
            id="meta-title"
            dir="ltr"
            className="!text-end"
            value={metaTitle}
            onChange={(e) => setMetaTitle(e.target.value)}
            placeholder="SEO title"
          />
        </div>
        <div className="clothes-field">
          <label htmlFor="meta-desc">Meta Description</label>
          <textarea
            id="meta-desc"
            dir="ltr"
            className="!min-h-[5rem] !text-end"
            value={metaDescription}
            onChange={(e) => setMetaDescription(e.target.value)}
            placeholder="SEO description"
          />
        </div>
        <div className="clothes-field">
          <label htmlFor="meta-keys">Meta Keywords</label>
          <input
            id="meta-keys"
            dir="ltr"
            className="!text-end"
            value={metaKeywords}
            onChange={(e) => setMetaKeywords(e.target.value)}
            placeholder="keyword, keyword"
          />
        </div>
      </FormModal>
    </>
  );
}