const assert = require("node:assert/strict");
const fs = require("node:fs");
const path = require("node:path");
const test = require("node:test");
const ts = require("../node_modules/typescript");

const filename = path.resolve(
  __dirname,
  "../src/components/creator/WorksGallery.tsx",
);
const file = ts.createSourceFile(
  filename,
  fs.readFileSync(filename, "utf8"),
  ts.ScriptTarget.Latest,
  true,
  ts.ScriptKind.TSX,
);
const cover = file.statements.find(
  (node) => ts.isFunctionDeclaration(node) && node.name?.text === "WorkCover",
);
const compiled = ts.transpileModule(cover.getText(file), {
  compilerOptions: { module: ts.ModuleKind.CommonJS, jsx: ts.JsxEmit.React },
}).outputText;

function harness(fetch) {
  const state = [];
  const effects = [];
  const calls = [];
  const revoked = [];
  let cursor = 0;
  let effect;
  const react = {
    createElement: (type, props, ...children) => ({
      type,
      props: { ...props, children },
    }),
  };
  const useState = (initial) => {
    const index = cursor++;
    if (!(index in state)) state[index] = initial;
    return [
      state[index],
      (value) => {
        state[index] = value;
      },
    ];
  };
  const useEffect = (fn, deps) => {
    const index = cursor++;
    if (!effects[index]) {
      effect = fn;
      effects[index] = { deps };
    }
  };
  const url = {
    createObjectURL: () => "blob:local-cover",
    revokeObjectURL: (value) => revoked.push(value),
  };
  const Component = new Function(
    "exports",
    "React",
    "useState",
    "useEffect",
    "fetchCreatorBinary",
    "Flex",
    "Typography",
    "URL",
    compiled + "\nreturn exports.WorkCover;",
  )(
    {},
    react,
    useState,
    useEffect,
    (endpoint) => {
      calls.push(endpoint);
      return fetch();
    },
    "Flex",
    { Text: "Text" },
    url,
  );
  return {
    calls,
    revoked,
    render(props) {
      cursor = 0;
      const tree = Component(props);
      if (effect) {
        effects[2].cleanup = effect();
        effect = null;
      }
      return tree;
    },
    cleanup() {
      effects[2]?.cleanup?.();
    },
  };
}
const tick = async () => {
  for (let i = 0; i < 6; i++) await Promise.resolve();
};

test("comment thumbnails load only the cached local cover and release its image URL", async () => {
  const h = harness(async () => ({ cover: true }));
  const props = { workID: "work/id", title: "作品标题" };
  const loading = h.render(props);
  assert.equal(loading.type, "Flex");
  assert.equal(loading.props.children[0].props.children[0], "封面加载中");
  await tick();
  const image = h.render(props);
  assert.equal(image.type, "img");
  assert.equal(image.props.src, "blob:local-cover");
  assert.equal(image.props.alt, "作品标题");
  assert.deepEqual(h.calls, ["/creator/works/work%2Fid/cover"]);
  h.cleanup();
  assert.deepEqual(h.revoked, ["blob:local-cover"]);
});

test("missing cached cover is explicit and never replaced by a remote image", async () => {
  const h = harness(async () => {
    throw new Error("作品封面尚未缓存");
  });
  const props = { workID: "missing-cover", title: "作品封面" };
  h.render(props);
  await tick();
  const missing = h.render(props);
  assert.equal(missing.type, "Flex");
  assert.equal(missing.props.children[0].props.children[0], "封面未缓存");
  assert.deepEqual(h.calls, ["/creator/works/missing-cover/cover"]);
  h.cleanup();
  assert.deepEqual(h.revoked, []);
});