/**
 * SkipTheDrive Parsing Strategy
 *
 * Uses core-parser for browser management and ai-analyzer for utilities
 */

const {
  logger,
  cleanText,
  containsAnyKeyword,
  validateLocationAgainstFilters,
} = require("ai-analyzer");

/**
 * SkipTheDrive URL builder
 */
function buildSearchUrl(keyword, orderBy = "date", jobTypes = []) {
  const baseUrl = "https://www.skipthedrive.com/";
  const params = new URLSearchParams({
    s: keyword,
    orderby: orderBy,
  });

  if (jobTypes && jobTypes.length > 0) {
    params.append("job_type", jobTypes.join(","));
  }

  return `${baseUrl}?${params.toString()}`;
}

/**
 * SkipTheDrive parsing strategy function
 */
async function skipthedriveStrategy(coreParser, options = {}) {
  const {
    keywords = ["software engineer", "developer", "programmer"],
    locationFilter = null,
    maxPages = 5,
    jobTypes = [],
  } = options;

  const results = [];
  const rejectedResults = [];
  const seenJobs = new Set();

  try {
    // Create main page
    const page = await coreParser.createPage("skipthedrive-main");

    logger.info("🚀 Starting SkipTheDrive parser...");
    logger.info(`🔍 Keywords: ${keywords.join(", ")}`);
    logger.info(`📍 Location Filter: ${locationFilter || "None"}`);
    logger.info(`📄 Max Pages: ${maxPages}`);

    // Search for each keyword
    for (const keyword of keywords) {
      logger.info(`\n🔍 Searching for: ${keyword}`);

      const searchUrl = buildSearchUrl(keyword, "date", jobTypes);

      try {
        // Navigate to search results
        await coreParser.navigateTo(searchUrl, {
          pageId: "skipthedrive-main",
          retries: 2,
          timeout: 30000,
        });

        // Wait for job listings to load
        const hasResults = await coreParser
          .waitForSelector(
            "#loops-wrapper",
            {
              timeout: 5000,
            },
            "skipthedrive-main"
          )
          .catch(() => {
            logger.warning(`No results found for keyword: ${keyword}`);
            return false;
          });

        if (!hasResults) {
          continue;
        }

        // Process multiple pages
        let currentPage = 1;
        let hasNextPage = true;

        while (hasNextPage && currentPage <= maxPages) {
          logger.info(`📄 Processing page ${currentPage} for "${keyword}"`);

          // Extract jobs from current page
          const pageJobs = await extractJobsFromPage(
            page,
            keyword,
            locationFilter
          );

          for (const job of pageJobs) {
            // Skip duplicates
            if (seenJobs.has(job.jobId)) continue;
            seenJobs.add(job.jobId);

            // Validate location if filtering enabled
            if (locationFilter) {
              const locationValid = validateLocationAgainstFilters(
                job.location,
                locationFilter
              );

              if (!locationValid) {
                rejectedResults.push({
                  ...job,
                  rejectionReason: "Location filter mismatch",
                });
                continue;
              }
            }

            results.push(job);
          }

          // Check for next page
          hasNextPage = await hasNextPageAvailable(page);
          if (hasNextPage && currentPage < maxPages) {
            await navigateToNextPage(page, currentPage + 1);
            currentPage++;

            // Wait for new page to load
            await page.waitForTimeout(2000);
          } else {
            hasNextPage = false;
          }
        }
      } catch (error) {
        logger.error(`Error processing keyword "${keyword}": ${error.message}`);
      }
    }

    logger.info(
      `🎯 SkipTheDrive parsing completed: ${results.length} jobs found, ${rejectedResults.length} rejected`
    );

    return {
      results,
      rejectedResults,
      summary: {
        totalJobs: results.length,
        totalRejected: rejectedResults.length,
        keywords: keywords.join(", "),
        locationFilter,
        source: "skipthedrive",
      },
    };
  } catch (error) {
    logger.error(`❌ SkipTheDrive parsing failed: ${error.message}`);
    throw error;
  }
}

/**
 * Extract jobs from current page
 */
async function extractJobsFromPage(page, keyword, locationFilter) {
  const jobs = [];

  try {
    // Get all job article elements
    const jobElements = await page.$$("article.job_listing");

    for (const jobElement of jobElements) {
      try {
        const job = await extractJobData(jobElement, keyword);
        if (job) {
          jobs.push(job);
        }
      } catch (error) {
        logger.warning(`Failed to extract job data: ${error.message}`);
      }
    }
  } catch (error) {
    logger.error(`Failed to extract jobs from page: ${error.message}`);
  }

  return jobs;
}

/**
 * Extract data from individual job element
 */
async function extractJobData(jobElement, keyword) {
  try {
    // Extract job ID
    const articleId = (await jobElement.getAttribute("id")) || "";
    const jobId = articleId ? articleId.replace("post-", "") : "";

    // Extract title
    const titleElement = await jobElement.$(".job_listing-title a");
    const title = titleElement
      ? cleanText(await titleElement.textContent())
      : "";
    const jobUrl = titleElement ? await titleElement.getAttribute("href") : "";

    // Extract company
    const companyElement = await jobElement.$(".company");
    const company = companyElement
      ? cleanText(await companyElement.textContent())
      : "";

    // Extract location
    const locationElement = await jobElement.$(".location");
    const location = locationElement
      ? cleanText(await locationElement.textContent())
      : "";

    // Extract date posted
    const dateElement = await jobElement.$(".job-date");
    const dateText = dateElement
      ? cleanText(await dateElement.textContent())
      : "";

    // Extract description
    const descElement = await jobElement.$(".job_listing-description");
    const description = descElement
      ? cleanText(await descElement.textContent())
      : "";

    // Check if featured
    const featuredElement = await jobElement.$(".featured");
    const isFeatured = featuredElement !== null;

    // Parse date
    let datePosted = null;
    let daysAgo = null;

    if (dateText) {
      const match = dateText.match(/(\d+)\s+days?\s+ago/);
      if (match) {
        daysAgo = parseInt(match[1]);
        const date = new Date();
        date.setDate(date.getDate() - daysAgo);
        datePosted = date.toISOString().split("T")[0];
      }
    }

    return {
      jobId,
      title,
      company,
      location,
      jobUrl,
      datePosted,
      dateText,
      daysAgo,
      description,
      isFeatured,
      keyword,
      extractedAt: new Date().toISOString(),
      source: "skipthedrive",
    };
  } catch (error) {
    logger.warning(`Error extracting job data: ${error.message}`);
    return null;
  }
}

/**
 * Check if next page is available
 */
async function hasNextPageAvailable(page) {
  try {
    const nextButton = await page.$(".next-page");
    return nextButton !== null;
  } catch {
    return false;
  }
}

/**
 * Navigate to next page
 */
async function navigateToNextPage(page, pageNumber) {
  try {
    const nextButton = await page.$(".next-page");
    if (nextButton) {
      await nextButton.click();
    }
  } catch (error) {
    logger.warning(
      `Failed to navigate to page ${pageNumber}: ${error.message}`
    );
  }
}

module.exports = {
  skipthedriveStrategy,
  buildSearchUrl,
  extractJobsFromPage,
  extractJobData,
};