"use client";

import { useCallback, useEffect, useMemo, useState } from "react";

type Project = { id: string; name: string; revision: number; updatedAt: string; nodeModulesCleanedAt?: string };
type Report = { status: "passed" | "failed"; skillVersion: string; auditOutput: string; issues: Array<{ severity: string; code: string; file: string; line?: number; message: string; suggestion: string }>; limits: { zipBytes?: number; unpackedBytes: number } };

async function api<T>(url: string, init?: RequestInit): Promise<T> {
  const response = await fetch(url, { ...init, headers: { "Content-Type": "application/json", ...(init?.headers || {}) } });
  const data = await response.json();
  if (!response.ok) throw new Error(data.error || `请求失败：${response.status}`);
  return data;
}

export default function Studio() {
  const [projects, setProjects] = useState<Project[]>([]);
  const [selected, setSelected] = useState<Project | null>(null);
  const [files, setFiles] = useState<string[]>([]);
  const [activeFile, setActiveFile] = useState("src/App.jsx");
  const [content, setContent] = useState("");
  const [report, setReport] = useState<Report | null>(null);
  const [busy, setBusy] = useState("");
  const [message, setMessage] = useState("连接已就绪");
  const [previewKey, setPreviewKey] = useState(0);

  const loadProjects = useCallback(async () => {
    const data = await api<{ projects: Project[] }>("/api/projects");
    setProjects(data.projects);
    if (!selected && data.projects[0]) setSelected(data.projects[0]);
  }, [selected]);

  useEffect(() => { void loadProjects(); }, [loadProjects]);
  useEffect(() => {
    if (!selected) return;
    void api<{ files: string[] }>(`/api/projects/${selected.id}`).then((data) => setFiles(data.files));
  }, [selected]);
  useEffect(() => {
    if (!selected || !activeFile) return;
    void api<{ content: string }>(`/api/projects/${selected.id}/files/${activeFile}`).then((data) => setContent(data.content));
  }, [selected, activeFile]);

  const previewUrl = useMemo(() => selected ? `/api/projects/${selected.id}/preview/index.html?v=${previewKey}` : "about:blank", [selected, previewKey]);

  async function createProject() {
    setBusy("create");
    try {
      const data = await api<{ project: Project }>("/api/projects", { method: "POST", body: JSON.stringify({ name: `灵感小工具 ${projects.length + 1}`, template: "basic" }) });
      setSelected(data.project); setReport(null); setMessage("项目已创建"); await loadProjects();
    } catch (error) { setMessage((error as Error).message); } finally { setBusy(""); }
  }

  async function save() {
    if (!selected) return;
    setBusy("save");
    try {
      const data = await api<{ project: Project }>(`/api/projects/${selected.id}/files/${activeFile}`, { method: "PUT", body: JSON.stringify({ content, revision: selected.revision }) });
      setSelected(data.project); setMessage(`已保存 · revision ${data.project.revision}`);
    } catch (error) { setMessage((error as Error).message); } finally { setBusy(""); }
  }

  async function run(action: "build" | "validate" | "package") {
    if (!selected) return;
    setBusy(action);
    try {
      const data = await api<{ report: Report; artifactUrl?: string }>(`/api/projects/${selected.id}/${action}`, { method: "POST", body: "{}" });
      setReport(data.report); setPreviewKey((value) => value + 1);
      setMessage(data.report.status === "passed" ? `${action} 已通过` : `${action} 发现 ${data.report.issues.length} 个问题`);
      if (data.artifactUrl) setMessage(`ZIP 已生成：${data.artifactUrl}`);
    } catch (error) { setMessage((error as Error).message); } finally { setBusy(""); }
  }

  return <main className="studio-shell">
    <header className="topbar">
      <div><span className="logo">R</span><strong>Rednote Tool Studio</strong><small>Agent-first 小工具工作台</small></div>
      <div className="actions"><a href="/openapi.json" target="_blank">OpenAPI</a><button onClick={createProject} disabled={Boolean(busy)}>＋ 新建项目</button></div>
    </header>
    <section className="workspace">
      <aside className="sidebar">
        <p className="section-label">项目</p>
        {projects.length === 0 && <button className="empty-project" onClick={createProject}>创建第一个小工具</button>}
        {projects.map((project) => <button key={project.id} className={`project-row ${selected?.id === project.id ? "selected" : ""}`} onClick={() => { setSelected(project); setReport(null); }}><span>{project.name}</span><small>r{project.revision}</small></button>)}
        {selected && <><p className="section-label files-label">文件</p>{files.map((file) => <button key={file} className={`file-row ${activeFile === file ? "selected" : ""}`} onClick={() => setActiveFile(file)}>{file}</button>)}</>}
      </aside>
      <section className="editor-panel">
        <div className="panel-head"><div><strong>{activeFile}</strong><small>{selected ? selected.id : "未选择项目"}</small></div><button onClick={save} disabled={!selected || Boolean(busy)}>{busy === "save" ? "保存中…" : "保存"}</button></div>
        <textarea value={content} onChange={(event) => setContent(event.target.value)} spellCheck={false} disabled={!selected} aria-label="文件编辑器" />
        <div className="statusbar"><span className={report?.status === "failed" ? "error-dot" : "ok-dot"} />{message}</div>
      </section>
      <section className="preview-panel">
        <div className="panel-head"><div><strong>手机预览</strong><small>离线 H5 产物</small></div><button onClick={() => run("build")} disabled={!selected || Boolean(busy)}>{busy === "build" ? "构建中…" : "构建并刷新"}</button></div>
        <div className="phone"><div className="speaker" /><iframe src={previewUrl} title="小工具预览" /></div>
      </section>
      <aside className="inspect-panel">
        <p className="section-label">交付门禁</p>
        <div className="command-grid"><button onClick={() => run("validate")} disabled={!selected || Boolean(busy)}>检查当前产物</button><button className="primary" onClick={() => run("package")} disabled={!selected || Boolean(busy)}>生成 ZIP</button></div>
        {report ? <div className={`report ${report.status}`}><strong>{report.status === "passed" ? "检查通过" : "需要修复"}</strong><small>skill {report.skillVersion} · {(report.limits.unpackedBytes / 1024).toFixed(1)} KiB</small><pre>{report.auditOutput}</pre>{report.issues.map((issue) => <article key={`${issue.code}-${issue.file}-${issue.line || 0}`}><b>{issue.code}</b><span>{issue.file}{issue.line ? `:${issue.line}` : ""}</span><p>{issue.message}</p><small>{issue.suggestion}</small></article>)}</div> : <div className="report-placeholder"><span>✓</span><p>构建后显示结构化检查结果、修复建议和 skill 审计摘要。</p></div>}
        <div className="agent-note"><strong>为 Codex 设计</strong><p>通过文件 API 修改代码，用 revision 防止覆盖，再调用 build、validate 和 package。完整契约见 OpenAPI。</p></div>
      </aside>
    </section>
  </main>;
}