import assert from 'node:assert/strict';
import * as fs from 'fs';
import * as os from 'os';
import * as path from 'path';
import test from 'node:test';

import { createCharacterDictionaryRuntimeService } from '../character-dictionary-runtime';
import { getSnapshotPath, writeSnapshot } from './cache';
import { CHARACTER_DICTIONARY_FORMAT_VERSION } from './constants';
import type { CharacterDictionarySnapshot } from './types';

const GRAPHQL_URL = 'https://graphql.anilist.co';
const PNG_1X1 = Buffer.from(
  'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/x8AAwMCAO+nmX8AAAAASUVORK5CYII=',
  'base64',
);

function makeTempDir(): string {
  return fs.mkdtempSync(path.join(os.tmpdir(), 'subminer-character-dictionary-'));
}

function createSnapshotWithoutImages(): CharacterDictionarySnapshot {
  return {
    formatVersion: CHARACTER_DICTIONARY_FORMAT_VERSION,
    mediaId: 130298,
    mediaTitle: 'The Eminence in Shadow',
    entryCount: 1,
    updatedAt: 1_700_000_000_000,
    termEntries: [['アレクシア', 'あれくしあ', 'name primary', '', 75, ['Alexia'], 0, '']],
    images: [],
  };
}

test('generateForCurrentMedia refreshes same-version snapshots missing images when inline images are enabled', async () => {
  const userDataPath = makeTempDir();
  const outputDir = path.join(userDataPath, 'character-dictionaries');
  writeSnapshot(getSnapshotPath(outputDir, 130298), createSnapshotWithoutImages());
  const originalFetch = globalThis.fetch;
  const fetchUrls: string[] = [];

  globalThis.fetch = (async (input: string | URL | Request, init?: RequestInit) => {
    const url = typeof input === 'string' ? input : input instanceof URL ? input.href : input.url;
    fetchUrls.push(url);

    if (url === GRAPHQL_URL) {
      const body = JSON.parse(String(init?.body ?? '{}')) as {
        query?: string;
      };
      if (body.query?.includes('characters(page: $page')) {
        return new Response(
          JSON.stringify({
            data: {
              Media: {
                title: {
                  english: 'The Eminence in Shadow',
                },
                characters: {
                  pageInfo: { hasNextPage: false },
                  edges: [
                    {
                      role: 'SUPPORTING',
                      node: {
                        id: 123,
                        description: 'Alexia Midgar.',
                        image: {
                          large: 'https://cdn.example.com/character-123.png',
                          medium: null,
                        },
                        name: {
                          full: 'Alexia Midgar',
                          native: 'アレクシア・ミドガル',
                        },
                      },
                    },
                  ],
                },
              },
            },
          }),
          { status: 200, headers: { 'content-type': 'application/json' } },
        );
      }
    }

    if (url === 'https://cdn.example.com/character-123.png') {
      return new Response(PNG_1X1, {
        status: 200,
        headers: { 'content-type': 'image/png' },
      });
    }

    throw new Error(`Unexpected fetch URL: ${url}`);
  }) as typeof globalThis.fetch;

  try {
    const runtime = createCharacterDictionaryRuntimeService({
      userDataPath,
      getCurrentMediaPath: () => '/tmp/eminence-s01e05.mkv',
      getCurrentMediaTitle: () => 'The Eminence in Shadow - S01E05',
      resolveMediaPathForJimaku: (mediaPath) => mediaPath,
      guessAnilistMediaInfo: async () => ({
        title: 'The Eminence in Shadow',
        season: null,
        episode: 5,
        source: 'fallback',
      }),
      getNameMatchImagesEnabled: () => true,
      now: () => 1_700_000_000_500,
    });

    const result = await runtime.generateForCurrentMedia();
    const refreshedSnapshot = JSON.parse(
      fs.readFileSync(getSnapshotPath(outputDir, 130298), 'utf8'),
    ) as CharacterDictionarySnapshot;

    assert.equal(result.fromCache, false);
    assert.ok(fetchUrls.includes(GRAPHQL_URL));
    assert.ok(refreshedSnapshot.images.some((image) => image.path === 'img/m130298-c123.png'));
  } finally {
    globalThis.fetch = originalFetch;
  }
});

test('generateForCurrentMedia keeps same-version snapshots without images when inline images are disabled', async () => {
  const userDataPath = makeTempDir();
  const outputDir = path.join(userDataPath, 'character-dictionaries');
  writeSnapshot(getSnapshotPath(outputDir, 130298), createSnapshotWithoutImages());
  const originalFetch = globalThis.fetch;

  globalThis.fetch = (async (input: string | URL | Request) => {
    const url = typeof input === 'string' ? input : input instanceof URL ? input.href : input.url;
    throw new Error(`Unexpected fetch URL: ${url}`);
  }) as typeof globalThis.fetch;

  try {
    const runtime = createCharacterDictionaryRuntimeService({
      userDataPath,
      getCurrentMediaPath: () => '/tmp/eminence-s01e05.mkv',
      getCurrentMediaTitle: () => 'The Eminence in Shadow - S01E05',
      resolveMediaPathForJimaku: (mediaPath) => mediaPath,
      guessAnilistMediaInfo: async () => ({
        title: 'The Eminence in Shadow',
        season: null,
        episode: 5,
        source: 'fallback',
      }),
      getNameMatchImagesEnabled: () => false,
      now: () => 1_700_000_000_500,
    });

    const result = await runtime.generateForCurrentMedia();

    assert.equal(result.fromCache, true);
  } finally {
    globalThis.fetch = originalFetch;
  }
});