(() => {
    "use strict";

    const grid = document.querySelector("#project-grid");
    const refreshButton = document.querySelector("#refresh-projects");
    const status = document.querySelector("#refresh-status");
    const projectCounts = document.querySelectorAll("[data-project-count]");
    const liveStatus = document.querySelector("#live-status");
    const liveStatusLabel = document.querySelector("#live-status-label");

    if (!grid || !refreshButton || !status || !liveStatus || !liveStatusLabel) {
        return;
    }

    document.body.classList.add("is-enhanced");

    const createProjectCard = (project) => {
        if (
            typeof project.name !== "string" ||
            typeof project.route_path !== "string" ||
            !project.route_path.startsWith("/") ||
            project.route_path.startsWith("//")
        ) {
            return null;
        }

        const link = document.createElement("a");
        link.className = "site-item";
        link.href = project.route_path;
        link.title = project.name;

        const cardTop = document.createElement("div");
        cardTop.className = "site-card-top";

        const avatar = document.createElement("span");
        avatar.className = "site-avatar";
        avatar.setAttribute("aria-hidden", "true");
        avatar.textContent = Array.from(project.name)[0]?.toUpperCase() || "A";

        const open = document.createElement("span");
        open.className = "site-open";
        open.setAttribute("aria-hidden", "true");
        open.innerHTML = `
            <svg width="17" height="17" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
                <path d="M7 17 17 7M8 7h9v9"></path>
            </svg>
        `;
        cardTop.append(avatar, open);

        const info = document.createElement("div");
        info.className = "site-info";

        const name = document.createElement("h3");
        name.className = "site-name";
        name.textContent = project.name;

        const description = document.createElement("span");
        description.className = "site-desc";
        description.textContent = "本地静态应用";
        info.append(name, description);

        const footer = document.createElement("div");
        footer.className = "site-card-footer";

        const path = document.createElement("span");
        path.className = "site-path";
        path.textContent = project.route_path;

        const ready = document.createElement("span");
        ready.className = "site-ready";
        ready.textContent = "READY";

        footer.append(path, ready);
        link.append(cardTop, info, footer);
        return link;
    };

    let renderedSignature = JSON.stringify(
        Array.from(grid.querySelectorAll(".site-item")).map((link) => [
            link.title,
            link.getAttribute("href"),
        ]),
    );

    const projectsSignature = (projects) =>
        JSON.stringify(
            projects.map((project) => [project.name, project.route_path]),
        );

    const renderProjects = (projects) => {
        const nextSignature = projectsSignature(projects);
        if (nextSignature === renderedSignature) {
            return false;
        }

        grid.replaceChildren();

        if (projects.length === 0) {
            const emptyState = document.createElement("div");
            emptyState.className = "empty-state";
            emptyState.innerHTML = `
                <span class="empty-visual" aria-hidden="true">
                    <svg width="38" height="38" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round">
                        <path d="M3 7a2 2 0 0 1 2-2h4l2 2h8a2 2 0 0 1 2 2v9a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2Z"></path>
                        <path d="M8 13h8M8 16h5"></path>
                    </svg>
                </span>
                <h3>这里还没有项目</h3>
                <p>在托管根目录下创建子目录，并放入 <code>index.html</code>，刷新后即可在这里看到它。</p>
            `;
            grid.append(emptyState);
            renderedSignature = nextSignature;
            return true;
        }

        const cards = projects.map(createProjectCard).filter(Boolean);
        grid.append(...cards);
        renderedSignature = nextSignature;
        return true;
    };

    const updateProjectCounts = (count) => {
        projectCounts.forEach((element) => {
            element.textContent = String(count);
        });
    };

    refreshButton.addEventListener("click", async () => {
        refreshButton.disabled = true;
        refreshButton.classList.add("is-loading");
        grid.setAttribute("aria-busy", "true");
        status.textContent = "正在重新扫描项目...";

        try {
            const response = await fetch("/api/projects", {
                cache: "no-store",
                headers: { Accept: "application/json" },
            });

            if (!response.ok) {
                throw new Error(`HTTP ${response.status}`);
            }

            const payload = await response.json();
            if (!Array.isArray(payload.projects)) {
                throw new Error("项目列表格式无效");
            }

            const changed = renderProjects(payload.projects);
            updateProjectCounts(payload.projects.length);
            status.textContent = changed ? "项目列表已刷新" : "项目列表已是最新";
        } catch (error) {
            console.error("刷新项目列表失败", error);
            status.textContent = "刷新失败，请稍后重试";
        } finally {
            refreshButton.disabled = false;
            refreshButton.classList.remove("is-loading");
            grid.removeAttribute("aria-busy");
        }
    });

    if (!("EventSource" in window)) {
        liveStatusLabel.textContent = "手动刷新";
        return;
    }

    const eventSource = new EventSource("/api/projects/events");

    eventSource.addEventListener("open", () => {
        liveStatusLabel.textContent = "实时同步";
        liveStatus.classList.add("is-live");
        liveStatus.classList.remove("is-reconnecting");
    });

    eventSource.addEventListener("projects", (event) => {
        try {
            const payload = JSON.parse(event.data);
            if (!Array.isArray(payload.projects)) {
                throw new Error("项目列表格式无效");
            }

            const changed = renderProjects(payload.projects);
            updateProjectCounts(payload.projects.length);
            if (changed) {
                status.textContent = "检测到目录变化，项目列表已自动更新";
            }
        } catch (error) {
            console.error("处理项目更新事件失败", error);
            status.textContent = "收到项目更新，但无法解析";
        }
    });

    eventSource.addEventListener("error", () => {
        liveStatusLabel.textContent = "同步重连中";
        liveStatus.classList.remove("is-live");
        liveStatus.classList.add("is-reconnecting");
    });
})();