import express from 'express';
import Database from 'better-sqlite3';
import type { AddressInfo } from 'node:net';
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import {
  GrowthAccountResponseSchema,
  GrowthOverviewResponseSchema,
} from '../../packages/api-contracts/src/index.js';
import { runMigrations } from '../../src/database/client.js';
import { AccountGrowthRepository } from '../../src/database/growth-repository.js';
import type { WebContext } from '../../src/web/context.js';
import { createGrowthRouter } from '../../src/web/routes/growth.js';
import type { RedditPost } from '../../src/reddit/api.js';

const ACCOUNT = '@t2_grower:reddit.com';
const ENCODED = encodeURIComponent(ACCOUNT);

const servers: Array<ReturnType<express.Express['listen']>> = [];

async function call(
  app: express.Express,
  method: string,
  path: string,
  body?: unknown,
): Promise<{ status: number; json: any }> {
  const server = app.listen(0);
  servers.push(server);
  await new Promise<void>((resolve) => server.once('listening', resolve));
  const { port } = server.address() as AddressInfo;
  const response = await fetch(`http://127.0.0.1:${port}${path}`, {
    method,
    headers: body === undefined ? {} : { 'Content-Type': 'application/json' },
    body: body === undefined ? undefined : JSON.stringify(body),
  });
  const text = await response.text();
  return { status: response.status, json: text ? JSON.parse(text) : null };
}

afterEach(async () => {
  await Promise.all(servers.splice(0).map((server) => (
    new Promise<void>((resolve) => server.close(() => resolve()))
  )));
});

function thread(id: string): RedditPost {
  return {
    id,
    name: `t3_${id}`,
    subreddit: 'cats',
    author: 'someone',
    title: `Thread ${id}`,
    url: `https://www.reddit.com/r/cats/comments/${id}/`,
    permalink: `/r/cats/comments/${id}/`,
    thumbnail: '',
    is_self: true,
    created_utc: 1_700_000,
    over_18: false,
    spoiler: false,
    num_comments: 12,
  } as RedditPost;
}

describe('growth route', () => {
  let db: Database.Database;
  let repo: AccountGrowthRepository;
  let app: express.Express;
  let pushed: Array<{ level: string; message: string }>;

  beforeEach(() => {
    db = new Database(':memory:');
    db.pragma('foreign_keys = ON');
    runMigrations(db);
    db.prepare(`
      INSERT INTO reddit_accounts (
        account_id, reddit_username, matrix_user_id, status, is_active,
        cookies_json, matrix_credentials_json, created_at, updated_at
      ) VALUES (?, 'grower', ?, 'verified', 1, '[]', '{}', 0, 0)
    `).run(ACCOUNT, ACCOUNT);
    repo = new AccountGrowthRepository(db);
    pushed = [];

    const ctx = {
      broadcaster: { push: (level: string, message: string) => pushed.push({ level, message }) },
      services: {
        growth: repo,
        redditAccounts: {
          list: () => [{ accountId: ACCOUNT, redditUsername: 'grower' }],
        },
      },
    } as unknown as WebContext;

    app = express();
    app.use(express.json());
    app.use('/api', createGrowthRouter(ctx));
  });

  describe('GET /api/growth', () => {
    it('returns a contract-valid overview for an unconfigured account', async () => {
      const { status, json } = await call(app, 'GET', '/api/growth');

      expect(status).toBe(200);
      // Parsing with the shared package schema is what stops the server-side
      // mirror in growth-contracts.ts drifting from what the dashboard expects.
      const parsed = GrowthOverviewResponseSchema.parse(json);
      expect(parsed.accounts).toHaveLength(1);
      expect(parsed.accounts[0]).toMatchObject({
        accountId: ACCOUNT,
        redditUsername: 'grower',
        subredditCount: 0,
        activeSubredditCount: 0,
      });
      expect(parsed.accounts[0].settings).toMatchObject({
        enabled: false,
        trustLevel: 0,
        dailyAllowance: 2,
        pausedReason: null,
      });
    });

    it('reports the raised allowance at a higher trust level', async () => {
      repo.setTrustLevel(ACCOUNT, 3);

      const { json } = await call(app, 'GET', '/api/growth');

      expect(json.accounts[0].settings).toMatchObject({ trustLevel: 3, dailyAllowance: 8 });
    });

    it('returns 503 when growth storage is not wired up', async () => {
      const bare = express();
      bare.use(express.json());
      bare.use('/api', createGrowthRouter({
        services: {}, broadcaster: { push: () => undefined },
      } as unknown as WebContext));

      const { status, json } = await call(bare, 'GET', '/api/growth');

      expect(status).toBe(503);
      expect(json.error).toMatch(/unavailable/);
    });
  });

  describe('GET /api/growth/:accountId', () => {
    it('returns settings, communities and comment history', async () => {
      repo.addSubreddit(ACCOUNT, 'cats', { weight: 2, dailyCap: 3 });
      repo.enqueueDiscovered(ACCOUNT, [thread('a')], 1_000);

      const { status, json } = await call(app, 'GET', `/api/growth/${ENCODED}`);

      expect(status).toBe(200);
      const parsed = GrowthAccountResponseSchema.parse(json);
      expect(parsed.account.subreddits).toEqual([expect.objectContaining({
        subreddit: 'cats', weight: 2, dailyCap: 3, enabled: true, postedLast24h: 0,
      })]);
      expect(parsed.account.recentComments).toEqual([expect.objectContaining({
        postId: 'a', subreddit: 'cats', status: 'discovered', removed: false,
      })]);
      expect(parsed.account.stats.queued).toBe(1);
    });

    it('404s for an unknown account', async () => {
      const { status, json } = await call(app, 'GET', '/api/growth/nobody');

      expect(status).toBe(404);
      expect(json.error).toBe('Reddit account not found');
    });
  });

  describe('PATCH /api/growth/:accountId', () => {
    it('enables growth and logs it for the operator', async () => {
      const { status, json } = await call(app, 'PATCH', `/api/growth/${ENCODED}`, {
        enabled: true,
        minDelayMs: 1_800_000,
        quietHours: { enabled: true, startHour: 23, endHour: 7 },
      });

      expect(status).toBe(200);
      GrowthAccountResponseSchema.parse(json);
      expect(json.account.settings).toMatchObject({
        enabled: true,
        minDelayMs: 1_800_000,
        quietHours: { enabled: true, startHour: 23, endHour: 7 },
      });
      expect(repo.getSettings(ACCOUNT).enabled).toBe(true);
      expect(pushed).toContainEqual({
        level: 'info',
        message: 'Account growth enabled for u/grower',
      });
    });

    it('sets and clears the daily limit override', async () => {
      const set = await call(app, 'PATCH', `/api/growth/${ENCODED}`, { dailyLimit: 7 });

      expect(set.status).toBe(200);
      GrowthAccountResponseSchema.parse(set.json);
      expect(set.json.account.settings).toMatchObject({
        dailyLimit: 7,
        dailyAllowance: 7,
        adaptiveAllowance: 2,
      });

      const cleared = await call(app, 'PATCH', `/api/growth/${ENCODED}`, { dailyLimit: null });

      expect(cleared.json.account.settings).toMatchObject({
        dailyLimit: null,
        dailyAllowance: 2,
        adaptiveAllowance: 2,
      });
    });

    it('reports the override as the enforced allowance even below the earned one', async () => {
      repo.setTrustLevel(ACCOUNT, 4);
      await call(app, 'PATCH', `/api/growth/${ENCODED}`, { dailyLimit: 1 });

      const { json } = await call(app, 'GET', `/api/growth/${ENCODED}`);

      expect(json.account.settings).toMatchObject({
        dailyLimit: 1, dailyAllowance: 1, adaptiveAllowance: 12,
      });
    });

    it.each([0, 51, 2.5])('rejects a daily limit of %s', async (dailyLimit) => {
      const { status } = await call(app, 'PATCH', `/api/growth/${ENCODED}`, { dailyLimit });

      expect(status).toBe(400);
    });

    it('never resets an earned trust level', async () => {
      repo.setTrustLevel(ACCOUNT, 2);

      await call(app, 'PATCH', `/api/growth/${ENCODED}`, { enabled: true });

      expect(repo.getSettings(ACCOUNT).trustLevel).toBe(2);
    });

    it.each([
      [{ enabled: 'yes' }],
      [{ minDelayMs: -1 }],
      [{ quietHours: { enabled: true, startHour: 24, endHour: 3 } }],
      [{ unknownField: true }],
      [{ jitterMs: 99_999_999 }],
    ])('rejects invalid settings %o', async (body) => {
      const { status, json } = await call(app, 'PATCH', `/api/growth/${ENCODED}`, body);

      expect(status).toBe(400);
      expect(json.error).toMatch(/Invalid growth settings/);
    });
  });

  describe('pause and resume', () => {
    it('pauses with a default reason and resumes', async () => {
      const paused = await call(app, 'POST', `/api/growth/${ENCODED}/pause`, {});
      expect(paused.status).toBe(200);
      expect(paused.json.account.settings.pausedReason).toBe('Paused by the operator');

      const resumed = await call(app, 'POST', `/api/growth/${ENCODED}/resume`);
      expect(resumed.status).toBe(200);
      expect(resumed.json.account.settings.pausedReason).toBeNull();
    });

    it('accepts an operator-supplied reason', async () => {
      const { json } = await call(app, 'POST', `/api/growth/${ENCODED}/pause`, {
        reason: 'Checking a removal by hand',
      });

      expect(json.account.settings.pausedReason).toBe('Checking a removal by hand');
      expect(pushed).toContainEqual({ level: 'warn', message: 'Account growth paused for u/grower' });
    });

    it('clears the removal streak on resume', async () => {
      repo.setConsecutiveRemovals(ACCOUNT, 2);
      repo.pause(ACCOUNT, 'Two removals');

      const { json } = await call(app, 'POST', `/api/growth/${ENCODED}/resume`);

      expect(json.account.settings.consecutiveRemovals).toBe(0);
    });
  });

  describe('subreddit list', () => {
    it('adds a community and returns 201', async () => {
      const { status, json } = await call(app, 'POST', `/api/growth/${ENCODED}/subreddits`, {
        subreddit: 'r/AskUK',
        dailyCap: 3,
      });

      expect(status).toBe(201);
      GrowthAccountResponseSchema.parse(json);
      expect(json.account.subreddits).toEqual([expect.objectContaining({
        subreddit: 'AskUK', dailyCap: 3,
      })]);
    });

    it('rejects a malformed subreddit name', async () => {
      const { status, json } = await call(app, 'POST', `/api/growth/${ENCODED}/subreddits`, {
        subreddit: 'not a subreddit',
      });

      expect(status).toBe(400);
      expect(json.error).toMatch(/not a valid subreddit/);
    });

    it('rejects an out-of-range cap', async () => {
      const { status } = await call(app, 'POST', `/api/growth/${ENCODED}/subreddits`, {
        subreddit: 'cats', dailyCap: 500,
      });

      expect(status).toBe(400);
    });

    it('updates weight, cap and enabled state', async () => {
      repo.addSubreddit(ACCOUNT, 'cats');

      const { status, json } = await call(app, 'PATCH', `/api/growth/${ENCODED}/subreddits/cats`, {
        weight: 5, dailyCap: 4, enabled: false,
      });

      expect(status).toBe(200);
      expect(json.account.subreddits[0]).toMatchObject({
        subreddit: 'cats', weight: 5, dailyCap: 4, enabled: false,
      });
    });

    it('404s when updating a community not on the list', async () => {
      const { status, json } = await call(app, 'PATCH', `/api/growth/${ENCODED}/subreddits/dogs`, {
        enabled: false,
      });

      expect(status).toBe(404);
      expect(json.error).toMatch(/not on this account's list/);
    });

    it('removes a community', async () => {
      repo.addSubreddit(ACCOUNT, 'cats');

      const { status, json } = await call(app, 'DELETE', `/api/growth/${ENCODED}/subreddits/cats`);

      expect(status).toBe(200);
      expect(json.account.subreddits).toEqual([]);
    });

    it('404s when removing a community not on the list', async () => {
      const { status } = await call(app, 'DELETE', `/api/growth/${ENCODED}/subreddits/dogs`);

      expect(status).toBe(404);
    });

    it('surfaces a Reddit-imposed disable reason and cooldown', async () => {
      repo.addSubreddit(ACCOUNT, 'cats');
      repo.disableSubreddit(ACCOUNT, 'cats', 'banned (r/cats)');
      repo.addSubreddit(ACCOUNT, 'dogs');
      repo.cooldownSubreddit(ACCOUNT, 'dogs', 9_999_999_999_999);

      const { json } = await call(app, 'GET', `/api/growth/${ENCODED}`);
      const parsed = GrowthAccountResponseSchema.parse(json);

      expect(parsed.account.subreddits[0]).toMatchObject({
        subreddit: 'cats', enabled: false, disabledReason: 'banned (r/cats)',
      });
      expect(parsed.account.subreddits[1].cooldownUntil).toBe(9_999_999_999_999);
      expect(parsed.account.activeSubredditCount).toBe(0);
    });
  });

  it('scopes every route to one account', async () => {
    const other = '@t2_other:reddit.com';
    db.prepare(`
      INSERT INTO reddit_accounts (
        account_id, reddit_username, matrix_user_id, status, is_active,
        cookies_json, matrix_credentials_json, created_at, updated_at
      ) VALUES (?, 'other', ?, 'verified', 1, '[]', '{}', 0, 0)
    `).run(other, other);
    repo.addSubreddit(ACCOUNT, 'cats');

    // The stub account service only knows the first account, so the second is
    // correctly treated as unknown by the route.
    const { status } = await call(app, 'GET', `/api/growth/${encodeURIComponent(other)}`);

    expect(status).toBe(404);
    expect(repo.listSubreddits(other)).toEqual([]);
  });
});