import test from "node:test";
import assert from "node:assert/strict";
import { existsSync } from "node:fs";
import { readFile } from "node:fs/promises";
import { registerHooks } from "node:module";

const functionUrl = new URL("../functions/drawCat.ts", import.meta.url);
const configUrl = new URL("../functions/drawCat.yaml", import.meta.url);
const state = {
  user: null,
  collections: [],
  updates: [],
};

globalThis.__drawCatCloudMock = {
  database() {
    return {
      collection(name) {
        state.collections.push(name);
        return {
          where() {
            return {
              async getOne() {
                return { data: state.user };
              },
              async update(payload) {
                state.updates.push(payload);
                return {};
              },
            };
          },
        };
      },
    };
  },
};

globalThis.__drawCatUtilsMock = {
  checkToken(received, expected) {
    return received === expected;
  },
};

registerHooks({
  resolve(specifier, context, nextResolve) {
    if (specifier === "@lafjs/cloud") {
      return {
        url: "data:text/javascript,export default globalThis.__drawCatCloudMock",
        shortCircuit: true,
      };
    }
    if (specifier === "@/Utils") {
      return {
        url: "data:text/javascript,export default globalThis.__drawCatUtilsMock",
        shortCircuit: true,
      };
    }
    return nextResolve(specifier, context);
  },
});

let drawCat;

async function getDrawCat() {
  if (!drawCat) {
    ({ default: drawCat } = await import(functionUrl));
  }
  return drawCat;
}

function reset(user) {
  state.user = user;
  state.collections.length = 0;
  state.updates.length = 0;
}

async function drawWithRandom(randomValues, body) {
  const handler = await getDrawCat();
  const originalRandom = Math.random;
  const values = [...randomValues];
  Math.random = () => values.shift() ?? 0;
  try {
    return await handler({ body });
  } finally {
    Math.random = originalRandom;
  }
}

test("drawCat cloud function and configuration exist", async () => {
  assert.equal(existsSync(functionUrl), true);
  assert.equal(existsSync(configUrl), true);

  const yaml = await readFile(configUrl, "utf8");
  assert.match(yaml, /^name:\s*drawCat$/m);
});

test("draws an ordinary cat with weight 150 and charges 5 film", async () => {
  reset({ _id: "u1", token: "secret", film: 100 });

  const result = await drawWithRandom([0, 0], {
    uid: "u1",
    token: "secret",
  });

  assert.equal(result.code, 1);
  assert.equal(result.data.reward, 4);
  assert.equal(result.data.film, 95);
  assert.deepEqual(result.data.catArr, [1, 2, 3, 4]);
  assert.deepEqual(state.updates, [
    { catArr: [1, 2, 3, 4], film: 95 },
  ]);
});

test("draws a rare cat from the 50-weight range", async () => {
  reset({ _id: "u1", token: "secret", film: 100 });

  const result = await drawWithRandom([750.1 / 858, 0.99], {
    uid: "u1",
    token: "secret",
  });

  assert.equal(result.data.reward, 10);
  assert.deepEqual(result.data.catArr, [1, 2, 3, 10]);
});

test("drawing cat 11 adds only cat 11", async () => {
  reset({ _id: "u1", token: "secret", film: 100 });

  const result = await drawWithRandom([850.1 / 858, 0], {
    uid: "u1",
    token: "secret",
  });

  assert.equal(result.data.reward, 11);
  assert.deepEqual(result.data.catArr, [1, 2, 3, 11]);
  assert.deepEqual(state.updates, [
    { catArr: [1, 2, 3, 11], film: 95 },
  ]);
});

test("excludes owned cats and uses the next film cost", async () => {
  reset({
    _id: "u1",
    token: "secret",
    film: 100,
    catArr: [1, 2, 3, 4],
  });

  const result = await drawWithRandom([0, 0], {
    uid: "u1",
    token: "secret",
  });

  assert.equal(result.data.reward, 5);
  assert.equal(result.data.film, 90);
});

test("insufficient film does not update the user", async () => {
  reset({ _id: "u1", token: "secret", film: 4 });

  const result = await drawWithRandom([0, 0], {
    uid: "u1",
    token: "secret",
  });

  assert.equal(result.code, 0);
  assert.deepEqual(result.data, { film: 4, cost: 5 });
  assert.deepEqual(state.updates, []);
});

test("a completed cat pool does not charge film", async () => {
  reset({
    _id: "u1",
    token: "secret",
    film: 100,
    catArr: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11],
  });

  const result = await drawWithRandom([0, 0], {
    uid: "u1",
    token: "secret",
  });

  assert.equal(result.code, 0);
  assert.equal(result.msg, "已抽取所有猫咪");
  assert.deepEqual(state.updates, []);
});

test("gameName iaa routes drawCat to usersAd", async () => {
  reset({ _id: "u1", token: "secret", film: 100 });

  await drawWithRandom([0, 0], {
    uid: "u1",
    token: "secret",
    gameName: "iaa",
  });

  assert.equal(state.collections[0], "usersAd");
});