/**
 * 任务：查看热门
 *
 * 逻辑：
 * 1. 找到"查看热门"任务卡片
 * 2. 点击 toComplete 打开热门页面
 * 3. 点击第一个热门项目卡片
 * 4. 在新页面停留后关闭
 */

const path = require('path');
const logger = require(path.join(__dirname, '..', 'utils', 'logger'));
const {
  openNewPage,
  openLinkPage,
  safeClose,
  waitPageReady,
  waitForElements,
  getPageInfo,
} = require(path.join(__dirname, '..', 'utils', 'page'));
const { runDebugSteps } = require(path.join(__dirname, '..', 'utils', 'debugSteps'));

const PROJECT_CARD_SELECTORS = [
  '.dynamics-grid article.article-card',
  '.dynamics-grid .article-card',
  'article.article-card:has(h3)',
];

/**
 * 执行查看热门任务
 * @param {import('playwright').Page} page - 主页面
 */
async function dailyTrending(page, options = {}) {
  logger.info('👉 执行查看热门');

  const ctx = {
    page,
    trendingTask: null,
    trendingPage: null,
    cards: [],
    detailPage: null,
  };

  const steps = [
    {
      name: '查找查看热门任务卡片',
      page: (state) => state.page,
      run: async (state) => {
        const tasks = await state.page.locator('.novice-task-item-box').all();
        state.trendingTask = await findTaskByTitle(tasks, '查看热门');
        if (!state.trendingTask) {
          throw new Error('未找到"查看热门"任务卡片');
        }
      },
      inspect: async (state) => ({
        taskCardCount: await state.page.locator('.novice-task-item-box').count(),
        titleLabelCount: await state.page.locator('.task-card-title__label-text').count(),
        toCompleteCount: await state.page.locator('.toComplete').count(),
      }),
    },
    {
      name: '点击去完成并打开热门页',
      page: (state) => state.trendingPage || state.page,
      run: async (state) => {
        state.trendingPage = await openNewPage(
          state.page.context(),
          () => state.trendingTask.locator('.toComplete').click()
        );
        state.currentPage = state.trendingPage;
      },
      inspect: async (state) => ({
        taskToCompleteVisible: await state.trendingTask.locator('.toComplete').isVisible().catch(() => false),
      }),
    },
    {
      name: '查找热门项目卡片',
      page: (state) => state.trendingPage,
      run: async (state) => {
        const targetPage = state.trendingPage;

        if (!targetPage || targetPage.isClosed()) {
          throw new Error('热门页面不存在或已经关闭');
        }

        state.currentPage = targetPage;

        logger.info(`查找热门项目卡片，当前页面: ${targetPage.url()}`);

        // 等待热门项目区域出现
        await targetPage
          .locator('.dynamics-grid')
          .waitFor({
            state: 'visible',
            timeout: 15000,
          });

        state.cards = await findProjectCards(targetPage);

        if (state.cards.length === 0) {
          throw new Error('未找到热门项目卡片');
        }

        logger.info(`找到热门项目卡片: ${state.cards.length} 个`);
      },
      inspect: async (state) => ({
        currentUrl: state.trendingPage?.url(),
        dynamicsGridCount: await state.trendingPage
          .locator('.dynamics-grid')
          .count(),
        dynamicCardCount: await state.trendingPage
          .locator('.dynamics-grid .dynamic-card')
          .count(),
        repoCardCount: await state.trendingPage
          .locator('.dynamics-grid .home-repo-card')
          .count(),
        repoLinkCount: await state.trendingPage
          .locator('.dynamics-grid a.home-repo-card__link')
          .count(),
        dynamicsSourceLinkCount: await state.trendingPage
          .locator('a[href*="source_module=dynamics"]')
          .count(),
      }),
    },
    {
      name: '打开第一个热门项目详情页',
      page: (state) => state.trendingPage,
      run: async (state) => {
        const firstCard = state.cards[0];

        if (!firstCard) {
          throw new Error('没有找到可点击的热门项目卡片');
        }

        await firstCard.scrollIntoViewIfNeeded();

        const href = await firstCard.getAttribute('href');
        logger.info(`准备点击热门项目: ${href}`);

        const context = state.trendingPage.context();

        const [detailPage] = await Promise.all([
          context.waitForEvent('page', {
            timeout: 15000,
          }),
          firstCard.click({
            timeout: 15000,
          }),
        ]);

        state.detailPage = detailPage;
        state.currentPage = detailPage;

        await waitPageReady(detailPage);

        logger.info(`热门项目详情页已打开: ${detailPage.url()}`);
      },
      inspect: async (state) => ({
        cardCount: state.cards.length,
        firstCardHref: state.cards[0]
          ? await state.cards[0].getAttribute('href')
          : null,
      }),
    },
    {
      name: '停留热门项目详情页',
      page: (state) => state.detailPage,
      run: async (state) => {
        if (!state.detailPage || state.detailPage.isClosed()) {
          throw new Error('热门项目详情页不存在或已关闭');
        }

        await waitPageReady(state.detailPage);

        // 给页面曝光统计、埋点和任务接口留出时间
        await state.detailPage.waitForTimeout(10000);

        logger.info(
          `已在热门项目详情页停留10秒: ${state.detailPage.url()}`
        );
      },
      inspect: async (state) => ({
        detailPageUrl: state.detailPage?.url(),
        detailPageTitle: state.detailPage
          ? await state.detailPage.title().catch(() => '')
          : '',
      }),
    },
  ];

  try {
    await runDebugSteps('查看热门', steps, ctx, options);
    await ctx.page.waitForTimeout(5000);
  } finally {
    await safeClose(ctx.detailPage);
    await safeClose(ctx.trendingPage);
  }
}

async function findProjectCards(page) {
  logger.info(`findProjectCards 实际页面: ${page.url()}`);
  for (const selector of PROJECT_CARD_SELECTORS) {
    logger.info(`尝试选择器: "${selector}"`);
    const locator = page.locator(selector);
    try {
      await locator.first().waitFor({
        state: 'visible',
        timeout: 5000,
      });
      const count = await locator.count();
      if (count > 0) {
        logger.info(`选择器 "${selector}" 找到 ${count} 个热门项目链接`);

        return Array.from(
          { length: count },
          (_, index) => locator.nth(index)
        );
      }
    } catch (_) {
      logger.info(`选择器 "${selector}" 未找到元素`);
    }
  }
  const info = await getPageInfo(page);
  throw new Error(
    `未找到热门项目卡片，页面结构可能已变化。` +
    `页面标题: ${info.title}, 页面URL: ${info.url}`
  );
}

/**
 * 根据标题查找任务卡片
 */
async function findTaskByTitle(tasks, title) {
  for (const task of tasks) {
    try {
      const text = await task.locator('.task-card-title__label-text').innerText();
      if (text.includes(title)) {
        return task;
      }
    } catch (_) {
      // 跳过
    }
  }
  return null;
}

module.exports = dailyTrending;