import React, { useState, useEffect, useRef, lazy, Suspense } from "react";
import { createRoot } from "react-dom/client";
import { mountViewer, configure } from "./viewers";
import "./style.css";
const SkinEditor = lazy(() =>
  import("./editor/SkinEditor").then((m) => ({ default: m.SkinEditor })),
);
const done = (x) => !!(x.best || x.rejection);
const modelOf = (x) => x.model ?? x.folder;
const rejectionLabel = (x) =>
  x === "edited_unsatisfied" ? "edited 不满意" : "结果都不满意";
const annotationTypes = {
  all: "全部已标注",
  perfect: "有完美标注",
  best: "有最佳标注（含完美）",
  ordinary: "仅最佳标注（无完美）",
  result_unsatisfied: "结果都不满意",
  edited_unsatisfied: "edited 不满意",
};
const matchesAnnotation = (item, type) =>
  type === "all" ||
  (type === "perfect" && !!item.perfect) ||
  (type === "best" && !!item.best) ||
  (type === "ordinary" && !!item.best && !item.perfect) ||
  item.rejection === type;
const label = (r) => (r.version === "original" ? "原版" : r.version);
async function api(path, body) {
  const res = await fetch(
    path,
    body === undefined
      ? {}
      : {
          method: "POST",
          headers: {
            "Content-Type": "application/json",
            "X-Annotation-Client": "ddj-review",
          },
          body: JSON.stringify(body),
        },
  );
  const data = await res.json();
  if (!res.ok) throw Error(data.error || "请求失败");
  return data;
}
function Preview({ result }) {
  const ref = useRef(null);
  useEffect(() => mountViewer(ref.current, result), [result.url]);
  return (
    <div className="skin-stage" ref={ref}>
      <canvas />
      <span className="preview-status">正在加载 3D…</span>
    </div>
  );
}
function App() {
  const [items, setItems] = useState([]),
    [key, setKey] = useState(null),
    [filter, setFilter] = useState("pending"),
    [annotationType, setAnnotationType] = useState("all"),
    [folder, setFolder] = useState(""),
    [search, setSearch] = useState("");
  const [skipped, setSkipped] = useState(new Set()),
    [history, setHistory] = useState([]),
    [busy, setBusy] = useState(false),
    [notice, setNotice] = useState(null);
  const [camera, setCamera] = useState("angle"),
    [outer, setOuter] = useState(true),
    [uv, setUv] = useState(false),
    [image, setImage] = useState(null),
    [editor, setEditor] = useState(null);
  const busyRef = useRef(false),
    dialog = useRef(null),
    editorDialog = useRef(null);
  const item = items.find((x) => x.key === key);
  const matches = (
    x,
    f = filter,
    fo = folder,
    q = search,
    type = annotationType,
  ) =>
    (!fo || modelOf(x) === fo) &&
    x.id.toLowerCase().includes(q.trim().toLowerCase()) &&
    (f === "all" ||
      (f === "pending" && x.results.length > 0 && !done(x)) ||
      (f === "done" && done(x) && matchesAnnotation(x, type)) ||
      (f === "rejected" && !!x.rejection) ||
      (f === "no_results" && !x.results.length));
  const rows = items.filter((x) => matches(x));
  const jumpRows = item && !rows.includes(item) ? [item, ...rows] : rows;
  const toast = (message, error = false) => setNotice({ message, error });
  const show = (k, remember = true) => {
    if (busyRef.current) return;
    if (remember && key && key !== k) setHistory((h) => [...h, key]);
    setKey(k);
  };
  const first = (f = filter, fo = folder, q = search, skip = skipped) =>
    items.find((x) => matches(x, f, fo, q) && !skip.has(x.key))?.key || null;
  const next = (list = items, skip = skipped) => {
    const pool = list.filter(
      (x) => matches(x) && !skip.has(x.key) && x.key !== key,
    );
    const index = list.findIndex((x) => x.key === key);
    show((pool.find((x) => list.indexOf(x) > index) || pool[0])?.key || null);
  };
  async function load(refresh = false) {
    if (busyRef.current) return;
    busyRef.current = true;
    setBusy(true);
    try {
      const data = await api(
        refresh ? "/api/refresh" : "/api/state",
        refresh ? {} : undefined,
      );
      setItems(data.items);
      setKey(
        data.items.find((x) => x.key === key && matches(x))?.key ||
          data.items.find((x) => matches(x) && !skipped.has(x.key))?.key ||
          null,
      );
      if (refresh) toast("目录已刷新");
    } catch (e) {
      toast(e.message, true);
    } finally {
      busyRef.current = false;
      setBusy(false);
    }
  }
  async function save(kind, result, png) {
    if (busyRef.current || !item) return;
    busyRef.current = true;
    setBusy(true);
    try {
      const data = await api("/api/" + kind, {
        key: item.key,
        revision: item.revision,
        result: result?.name,
        reason: typeof result === "string" ? result : undefined,
        png,
      });
      const updated = items.map((x) => (x.key === key ? data.item : x));
      setItems(updated);
      const skip = new Set(skipped);
      skip.delete(key);
      setSkipped(skip);
      busyRef.current = false;
      setEditor(null);
      if (kind !== "clear") next(updated, skip);
      toast(kind === "clear" ? "已撤销标注" : "已保存 · " + item.id);
    } catch (e) {
      toast(e.message, true);
    } finally {
      busyRef.current = false;
      setBusy(false);
    }
  }
  function skip() {
    if (busyRef.current || !item) return;
    const s = new Set(skipped);
    s.add(key);
    setSkipped(s);
    next(items, s);
  }
  function previous() {
    if (!busyRef.current && history.length) {
      setKey(history.at(-1));
      setHistory(history.slice(0, -1));
    }
  }
  useEffect(() => {
    load();
  }, []);
  useEffect(() => configure(camera, outer, uv), [camera, outer, uv, key]);
  useEffect(() => {
    if (!notice) return;
    const t = setTimeout(() => setNotice(null), notice.error ? 8000 : 3500);
    return () => clearTimeout(t);
  }, [notice]);
  useEffect(() => {
    if (image) dialog.current?.showModal();
  }, [image]);
  useEffect(() => {
    if (editor) editorDialog.current?.showModal();
  }, [editor]);
  useEffect(() => {
    const handler = (e) => {
      if (
        busy ||
        image ||
        editor ||
        e.ctrlKey ||
        e.metaKey ||
        e.altKey ||
        e.target.closest("input,select,textarea,[contenteditable]")
      )
        return;
      if (e.key.toLowerCase() === "s") {
        e.preventDefault();
        skip();
      } else if (e.key === "ArrowLeft") {
        e.preventDefault();
        previous();
      } else if (e.key === "ArrowRight") {
        e.preventDefault();
        next();
      } else if (/^[1-9]$/.test(e.key)) {
        const r = item?.results[+e.key - 1];
        if (r) {
          e.preventDefault();
          save("choose", r);
        }
      }
    };
    document.addEventListener("keydown", handler);
    return () => document.removeEventListener("keydown", handler);
  });
  const progressItems = items.filter((x) => !folder || modelOf(x) === folder);
  const progressDone = progressItems.filter(done).length;
  const progressTotal =
    progressDone +
    progressItems.filter((x) => x.results.length && !done(x)).length;
  const counts = {
    done: progressItems.filter(done).length,
    pending: progressItems.filter((x) => x.results.length && !done(x)).length,
    rejected: progressItems.filter((x) => x.rejection).length,
    all: progressItems.length,
    no_results: progressItems.filter((x) => !x.results.length).length,
  };
  const changeFilter = (f) => {
    if (busyRef.current) return;
    setFilter(f);
    show(first(f));
  };
  return (
    <>
      <header className="topbar">
        <div className="brand">
          <span className="brand-icon">D</span>
          <div>
            <h1>DDJ 最佳结果标注</h1>
            <p>对照原图，选出最好的皮肤</p>
          </div>
        </div>
        <div className="progress">
          <div>
            <span>标注进度</span>
            <strong id="progressText">
              {progressDone} / {progressTotal}
            </strong>
          </div>
          <div className="progress-track">
            <i
              style={{
                width: `${(progressDone / (progressTotal || 1)) * 100}%`,
              }}
            />
          </div>
        </div>
        <button
          id="refresh"
          className="button secondary"
          disabled={busy}
          onClick={() => load(true)}
        >
          刷新目录
        </button>
      </header>
      <section className="filters">
        <div className="segments">
          {Object.entries({
            pending: "待标注",
            done: "已标注",
            rejected: "不满意",
            all: "全部",
            no_results: "无结果",
          }).map(([f, l]) => (
            <button
              key={f}
              data-filter={f}
              disabled={busy}
              className={filter === f ? "active" : ""}
              onClick={() => changeFilter(f)}
            >
              {l}{" "}
              <b
                id={`${{ all: "total", no_results: "noResult" }[f] || f}Count`}
              >
                {counts[f]}
              </b>
            </button>
          ))}
        </div>
        <select
          id="folder"
          aria-label="模型目录"
          disabled={busy}
          value={folder}
          onChange={(e) => {
            setFolder(e.target.value);
            show(first(filter, e.target.value));
          }}
        >
          <option value="">所有模型</option>
          {[...new Set(items.map(modelOf))].map((f) => (
            <option key={f}>{f}</option>
          ))}
        </select>
        <input
          id="search"
          type="search"
          aria-label="搜索编号"
          placeholder="搜索编号…"
          disabled={busy}
          value={search}
          onChange={(e) => {
            setSearch(e.target.value);
            show(first(filter, folder, e.target.value));
          }}
        />
      </section>
      {filter === "done" && (
        <section className="annotation-filters" aria-label="已标注类型筛选">
          <label htmlFor="annotationType">标注类型</label>
          <select
            id="annotationType"
            disabled={busy}
            value={annotationType}
            onChange={(e) => {
              const type = e.target.value;
              setAnnotationType(type);
              show(
                items.find(
                  (x) =>
                    matches(x, "done", folder, search, type) &&
                    !skipped.has(x.key),
                )?.key || null,
              );
            }}
          >
            {Object.entries(annotationTypes).map(([type, title]) => (
              <option key={type} value={type}>
                {title} ·{" "}
                {
                  items.filter((x) => matches(x, "done", folder, search, type))
                    .length
                }
              </option>
            ))}
          </select>
          <span>可与数据目录、编号搜索组合筛选</span>
        </section>
      )}
      <main>
        {item ? (
          <>
            <section className="item-heading">
              <div>
                <span className="eyebrow">{item.folder}</span>
                <h2 id="itemId">{item.id}</h2>
                <p id="itemInfo">
                  {item.results.length} 个结果版本 ·{" "}
                  {item.annotation_conflict
                    ? "标注冲突，请重新选择"
                    : item.invalid_best || item.invalid_rejection
                      ? "标注已失效，请重新选择"
                      : item.perfect
                        ? "已选最佳（完美）"
                        : item.best
                          ? "已保存最佳结果"
                          : item.rejection
                            ? rejectionLabel(item.rejection)
                            : "请选择最佳结果、标记不满意，或暂时忽略"}
                </p>
              </div>
              <div className="jump">
                <label htmlFor="jump">跳转条目</label>
                <select
                  id="jump"
                  disabled={busy}
                  value={key}
                  onChange={(e) => {
                    const s = new Set(skipped);
                    s.delete(e.target.value);
                    setSkipped(s);
                    show(e.target.value);
                  }}
                >
                  {jumpRows.map((x) => (
                    <option key={x.key} value={x.key}>
                      {x.perfect ? "★ " : done(x) ? "✓ " : ""}
                      {x.id}
                    </option>
                  ))}
                </select>
              </div>
            </section>
            <div className="workspace" id="workspace">
              <aside className="source-panel panel">
                <div className="reference-images">
                  {[
                    ["source", "原图", item.source_url],
                    ["edited", "中间图", item.edited_url],
                  ].map(([type, title, url]) => (
                    <section className="reference-image" key={type}>
                      <div className="panel-title">
                        <h3>
                          {type} · {title}
                        </h3>
                        <span>
                          {type === "source" && item.source_error
                            ? "err 样例"
                            : ""}
                        </span>
                      </div>
                      <button
                        hidden={!url}
                        id={
                          type === "source" ? "enlargeSource" : "enlargeEdited"
                        }
                        className="source-image-button"
                        onClick={() =>
                          setImage({ url, title: item.id + "_" + type })
                        }
                      >
                        <img
                          id={type + "Image"}
                          src={url || undefined}
                          alt={title}
                        />
                      </button>
                      {type === "edited" && (
                        <div
                          id="missingEdited"
                          className="missing-edited"
                          hidden={!!url}
                        >
                          暂无 edited 图片
                        </div>
                      )}
                    </section>
                  ))}
                </div>
                <div className="source-caption">
                  原图与中间图同时对照 · 点击任意图片放大
                </div>
                <div className="reject-actions">
                  <button
                    id="rejectResults"
                    className="button reject-button"
                    disabled={
                      busy ||
                      !item.results.length ||
                      item.rejection === "result_unsatisfied"
                    }
                    onClick={() => save("reject", "result_unsatisfied")}
                  >
                    结果都不满意
                  </button>
                  <button
                    id="rejectEdited"
                    className="button reject-button"
                    disabled={
                      busy ||
                      !item.edited_url ||
                      item.rejection === "edited_unsatisfied"
                    }
                    onClick={() => save("reject", "edited_unsatisfied")}
                  >
                    edited 不满意
                  </button>
                </div>
                <div
                  id="savedBox"
                  className="saved-box"
                  hidden={
                    !done(item) &&
                    !item.invalid_best &&
                    !item.invalid_rejection &&
                    !item.annotation_conflict
                  }
                >
                  <span>当前标注{item.perfect ? " · 完美" : ""}</span>
                  <strong id="savedName">
                    {item.rejection
                      ? rejectionLabel(item.rejection)
                      : item.best || "原标注需要重新选择"}
                  </strong>
                  {item.perfect_url && (
                    <button
                      className="text-button"
                      onClick={() =>
                        setImage({
                          url: item.perfect_url,
                          title: item.id + "_perfect.png",
                          pixelated: true,
                        })
                      }
                    >
                      查看修复后的皮肤
                    </button>
                  )}
                  <button
                    id="clearBest"
                    className="text-button"
                    disabled={busy}
                    onClick={() => save("clear")}
                  >
                    撤销此标注
                  </button>
                </div>
                <p className="save-note">
                  保存后自动进入下一项。暂时忽略不会写入文件。
                </p>
              </aside>
              <section className="comparison">
                <div className="comparison-toolbar">
                  <div className="camera-buttons">
                    <span>同步视角</span>
                    {Object.entries({
                      angle: "斜前",
                      front: "正面",
                      back: "背面",
                      head: "头部",
                    }).map(([c, l]) => (
                      <button
                        key={c}
                        data-camera={c}
                        className={camera === c ? "active" : ""}
                        onClick={() => setCamera(c)}
                      >
                        {l}
                      </button>
                    ))}
                  </div>
                  <div className="view-options">
                    <label>
                      <input
                        id="outerLayer"
                        type="checkbox"
                        checked={outer}
                        onChange={(e) => setOuter(e.target.checked)}
                      />
                      显示外层
                    </label>
                    <button
                      id="uvMode"
                      className="button tiny"
                      aria-pressed={uv}
                      onClick={() => setUv(!uv)}
                    >
                      {uv ? "显示 3D" : "只看 UV"}
                    </button>
                  </div>
                </div>
                <div
                  id="results"
                  className={"result-grid" + (uv ? " uv-only" : "")}
                >
                  {item.results.map((r, i) => (
                    <article
                      key={item.key + r.name}
                      data-result={r.name}
                      className={
                        "result-card" +
                        (item.best === r.name ? " selected" : "")
                      }
                    >
                      <div className="result-header">
                        <span className="version-name">{label(r)}</span>
                        <span
                          className={
                            item.best === r.name
                              ? "chosen-badge"
                              : "version-number"
                          }
                        >
                          {item.best === r.name
                            ? item.perfect
                              ? "最佳 · 完美"
                              : "已选最佳"
                            : i + 1}
                        </span>
                      </div>
                      <Preview result={r} />
                      <div className="uv-area">
                        <button
                          className="uv-button"
                          onClick={() =>
                            setImage({
                              url: r.url,
                              title: r.name,
                              pixelated: true,
                            })
                          }
                        >
                          <img src={r.url} alt={label(r) + " 的 UV 贴图"} />
                        </button>
                        <div className="uv-caption">
                          <strong>UV 贴图</strong>
                          <span>点击放大</span>
                        </div>
                      </div>
                      <div className="result-actions">
                        <div className="result-file">{r.name}</div>
                        <button
                          className="choose-button"
                          disabled={
                            busy || (item.best === r.name && !item.perfect)
                          }
                          onClick={() => save("choose", r)}
                        >
                          {item.best === r.name && !item.perfect
                            ? "当前最佳"
                            : "选为最佳"}
                        </button>
                        <button
                          className="perfect-button"
                          disabled={
                            busy ||
                            (item.perfect === r.name && !item.perfect_url)
                          }
                          onClick={() => save("perfect", r)}
                        >
                          选为最佳（完美）
                        </button>
                        <button
                          className="repair-button"
                          disabled={busy}
                          onClick={() =>
                            setEditor({
                              result: r,
                              url:
                                item.perfect === r.name && item.perfect_url
                                  ? item.perfect_url
                                  : r.url,
                            })
                          }
                        >
                          修复并选为最佳（完美）
                        </button>
                      </div>
                    </article>
                  ))}
                  {!item.results.length && (
                    <div className="no-result-card">
                      这个 source 暂无 result 图片
                    </div>
                  )}
                </div>
                <p className="preview-hint">
                  拖动任一模型可同步旋转，滚轮缩放；点击 UV 贴图可放大。
                </p>
              </section>
            </div>
          </>
        ) : (
          <section id="empty" className="empty panel">
            <h2>当前筛选下没有更多条目</h2>
            <p>可以切换筛选，或重新查看暂时忽略的条目。</p>
            <button
              id="resume"
              className="button primary"
              disabled={busy}
              onClick={() => {
                setSkipped(new Set());
                setFilter("pending");
                setFolder("");
                setSearch("");
                show(first("pending", "", "", new Set()));
              }}
            >
              继续查看待标注
            </button>
          </section>
        )}
      </main>
      <footer className="footer">
        <div className="navigation">
          <button
            id="previous"
            className="button secondary"
            disabled={busy || !history.length}
            onClick={previous}
          >
            ← 上一个
          </button>
          <button
            id="skip"
            className="button secondary"
            disabled={busy || !item}
            onClick={skip}
          >
            暂时忽略 →
          </button>
        </div>
        <span className="keyboard-hint">1–9 选择版本　S 忽略　← 回看</span>
        <span>本次已忽略 {skipped.size} 项 · 忽略不保存</span>
      </footer>
      {notice && (
        <div
          id="toast"
          role="status"
          className={"toast" + (notice.error ? " error" : "")}
        >
          {notice.message}
        </div>
      )}
      {image && (
        <dialog
          id="imageDialog"
          ref={dialog}
          onCancel={() => setImage(null)}
          onClick={(e) => {
            if (e.target === e.currentTarget) setImage(null);
          }}
        >
          <div className="dialog-top">
            <span>{image.title}</span>
            <button
              id="closeDialog"
              className="button secondary"
              onClick={() => setImage(null)}
            >
              关闭 ×
            </button>
          </div>
          <div className="dialog-image">
            <img
              id="dialogImage"
              src={image.url}
              alt="放大预览"
              className={image.pixelated ? "pixelated" : ""}
            />
          </div>
        </dialog>
      )}
      {editor && (
        <dialog
          className="editor-dialog"
          ref={editorDialog}
          onCancel={(e) => {
            e.preventDefault();
            if (!busy) setEditor(null);
          }}
        >
          <div className="dialog-top">
            <span>修复 {editor.result.name} · 左键绘制，右键旋转</span>
            <button
              className="button secondary"
              disabled={busy}
              onClick={() => setEditor(null)}
            >
              取消 ×
            </button>
          </div>
          <div className="editor-content">
            <aside className="editor-reference" aria-label="edited 参考图">
              <h3>edited · 参考图</h3>
              {item?.edited_url ? (
                <img
                  src={item.edited_url}
                  alt={`${item.id} 的 edited 参考图`}
                />
              ) : (
                <p>此条目暂无 edited 图片</p>
              )}
            </aside>
            <div className="editor-canvas-panel">
              <Suspense fallback={<p>正在加载皮肤编辑器…</p>}>
                <SkinEditor
                  textureUrl={editor.url}
                  busy={busy}
                  onError={(m) => toast(m, true)}
                  onSubmit={(png) => save("repair", editor.result, png)}
                />
              </Suspense>
            </div>
          </div>
          {notice?.error && <p role="alert">{notice.message}</p>}
        </dialog>
      )}
    </>
  );
}
createRoot(document.getElementById("root")).render(<App />);