---
import { getLangFromUrl } from "@/i18n";

const limit = Number(Astro.props.limit ?? 5);
const lang = getLangFromUrl(Astro.url);

function formatDate(iso: string) {
    return new Date(iso).toISOString().slice(0, 10);
}
---

<section
    id="latest-comments"
    class="latest-comments"
    data-lang={lang}
    data-limit={limit}
>
    <h2>{lang === "zh" ? "最新评论" : "Latest Comments"}</h2>

    <div class="comments-loading" id="comments-loading">
        <div class="loading-card"></div>
        <div class="loading-card"></div>
        <div class="loading-card"></div>
    </div>

    <ul class="comment-list" id="comment-list" style="display: none;"></ul>

    <p class="empty" id="comments-empty" style="display: none;">
        {lang === "zh" ? "还没有评论。" : "No comments yet."}
    </p>

    <p class="empty" id="comments-error" style="display: none;">
        {lang === "zh" ? "评论加载失败。" : "Failed to load comments."}
    </p>
</section>

<script>
    type CommentAuthor = {
        login?: string;
        avatarUrl?: string;
        url?: string;
    };

    type LatestCommentItem = {
        id: string;
        body?: string;
        updatedAt: string;
        author?: CommentAuthor | null;
        postId: string;
        postTitle: string;
        localUrl: string;
        isReply: boolean;
        replyTo?: string;
    };

    type CommentsResponse = {
        comments?: LatestCommentItem[];
        error?: string;
    };

    const root = document.getElementById(
        "latest-comments",
    ) as HTMLElement | null;
    if (root) {
        const lang = root.dataset.lang || "zh";
        const limit = root.dataset.limit || "5";

        const loadingEl = root.querySelector("#comments-loading");
        const listEl = root.querySelector("#comment-list");
        const emptyEl = root.querySelector("#comments-empty");
        const errorEl = root.querySelector("#comments-error");

        if (
            !(loadingEl instanceof HTMLElement) ||
            !(listEl instanceof HTMLElement) ||
            !(emptyEl instanceof HTMLElement) ||
            !(errorEl instanceof HTMLElement)
        ) {
            throw new Error("Comments elements not found");
        }

        const formatDate = (iso: string) =>
            new Date(iso).toISOString().slice(0, 10);

        const renderComment = (comment: LatestCommentItem) => {
            console.log("Start render");
            const li = document.createElement("li");
            li.className = `comment-card ${comment.isReply ? "is-reply" : ""}`;

            li.innerHTML = `
        <a href="${comment.localUrl}" class="comment-link" data-astro-reload>
          <div class="comment-top">
            ${
                comment.author?.avatarUrl
                    ? `<img
                    src="${comment.author.avatarUrl}"
                    alt="${comment.author?.login ?? "author"}"
                    class="comment-avatar"
                  />`
                    : ""
            }

            <div class="comment-meta">
              <span class="comment-author">${comment.author?.login ?? "Unknown"}</span>
              <span class="comment-date">${formatDate(comment.updatedAt)}</span>
            </div>

            <span class="comment-post-title" title="${comment.postTitle}">
              ${comment.postTitle}
            </span>
          </div>

          ${
              comment.isReply
                  ? `<p class="comment-kind">${
                        lang === "zh"
                            ? `回复 @${comment.replyTo ?? "Unknown"}`
                            : `Reply to @${comment.replyTo ?? "Unknown"}`
                    }</p>`
                  : ""
          }

          <p class="comment-body">${comment.body ?? ""}</p>
        </a>
      `;

            return li;
        };

        fetch(`/api/comments.json?lang=${lang}&limit=${limit}`)
            .then((res) => {
                if (!res.ok) throw new Error("Request failed");
                return res.json() as Promise<CommentsResponse>;
            })
            .then((data) => {
                loadingEl.style.display = "none";

                const comments = data.comments ?? [];

                if (!comments.length) {
                    emptyEl.style.display = "block";
                    return;
                }

                listEl.style.display = "grid";

                comments.forEach((comment) => {
                    listEl.appendChild(renderComment(comment));
                });
            })
            .catch((err) => {
                console.error("Comments fetch failed:", err);
                loadingEl.style.display = "none";
                errorEl.style.display = "block";
            });
    }
</script>

<style is:global>
    .latest-comments {
        margin-top: 1.5rem;
    }

    .latest-comments h2 {
        margin-bottom: 0.8rem;
    }

    .comment-list {
        font-family:
            system-ui,
            -apple-system,
            BlinkMacSystemFont,
            "Segoe UI",
            "PingFang SC",
            "Hiragino Sans GB",
            "Microsoft YaHei",
            "Noto Sans CJK SC",
            "Source Han Sans SC",
            sans-serif;
        list-style: none;
        margin: 0;
        padding: 0;
        display: grid;
        gap: 0.9rem;
    }

    .comment-card {
        margin: 0;
    }

    .comment-link {
        display: block;
        padding: 0.9rem 1rem;
        text-decoration: none;
        color: inherit;
        border: 1px dashed #aeb8c2;
        background: rgba(160, 175, 190, 0.06);
    }

    .comment-card.is-reply .comment-link {
        border-style: dashed;
        background: rgba(160, 175, 190, 0.1);
    }

    .comment-top {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        margin-bottom: 0.5rem;
    }

    .comment-meta {
        display: flex;
        flex-direction: column;
        min-width: 0;
    }

    .comment-post-title {
        margin-left: auto;
        text-align: right;
        font-size: 0.92rem;
        font-weight: 700;
        color: #6f8090;
        max-width: 45%;
        line-height: 1.35;
        overflow-wrap: anywhere;
    }

    .comment-avatar {
        width: 42px;
        height: 42px;
        object-fit: cover;
        display: block;
    }

    .comment-author {
        font-weight: 700;
        line-height: 1.3;
    }

    .comment-date {
        font-size: 0.9rem;
        color: #6f8090;
    }

    .comment-kind {
        margin: 0 0 0.35rem 0;
        font-size: 0.82rem;
        color: #8c8c8c;
        font-style: italic;
    }

    .comment-body {
        margin: 0;
        color: #555;
        line-height: 1.6;
        font-style: italic;
    }

    .empty {
        color: #6f8090;
    }

    .comments-loading {
        display: grid;
        gap: 0.9rem;
    }

    .loading-card {
        height: 92px;
        border: 1px dashed #aeb8c2;
        background: linear-gradient(
            90deg,
            rgba(160, 175, 190, 0.06) 25%,
            rgba(160, 175, 190, 0.16) 50%,
            rgba(160, 175, 190, 0.06) 75%
        );
        background-size: 200% 100%;
        animation: shimmer 1.2s infinite linear;
    }

    @keyframes shimmer {
        from {
            background-position: 200% 0;
        }
        to {
            background-position: -200% 0;
        }
    }

    :global(.dark) .comment-link {
        border-color: #7f8c97;
        background: rgba(180, 190, 200, 0.06);
    }

    :global(.dark) .comment-card.is-reply .comment-link {
        background: rgba(180, 190, 200, 0.1);
    }

    :global(.dark) .comment-post-title {
        color: #c8d2dc;
    }

    :global(.dark) .comment-date,
    :global(.dark) .empty {
        color: #aab7c4;
    }

    :global(.dark) .comment-kind {
        color: #b8b8b8;
    }

    :global(.dark) .comment-body {
        color: #d3d7db;
    }

    :global(.dark) .loading-card {
        border-color: #7f8c97;
        background: linear-gradient(
            90deg,
            rgba(180, 190, 200, 0.06) 25%,
            rgba(180, 190, 200, 0.16) 50%,
            rgba(180, 190, 200, 0.06) 75%
        );
        background-size: 200% 100%;
    }

    @media (max-width: 640px) {
        .comment-top {
            align-items: flex-start;
            flex-wrap: wrap;
        }

        .comment-post-title {
            margin-left: 0;
            max-width: 100%;
            width: 100%;
            text-align: left;
        }
    }
</style>