#!/usr/bin/env tsx
/**
 * Import Catholic churches and mass schedules from discovermass.com (USA)
 *
 * discovermass.com is a US Catholic church directory with 20,284 churches.
 * Data includes name, address, phone, website, coordinates, mass times,
 * confessions, and adoration schedules.
 *
 * robots.txt specifies Crawl-delay: 10 — this importer follows that rule.
 *
 * Usage:
 *   npx tsx scripts/import-discovermass.ts --all
 *   npx tsx scripts/import-discovermass.ts --all --dry-run
 *   npx tsx scripts/import-discovermass.ts --all --resume-from 5000
 *   npx tsx scripts/import-discovermass.ts --all --job-id {uuid}
 */

import dotenv from 'dotenv';
import path from 'path';

dotenv.config({ path: path.resolve(process.cwd(), '.env.local') });
dotenv.config({ path: path.resolve(process.cwd(), '.env') });

import { Pool } from 'pg';
import { PrismaPg } from '@prisma/adapter-pg';
import { PrismaClient } from '@prisma/client';

const dbUrl = process.env.DATABASE_URL || 'postgresql://postgres:postgres@localhost:5432/nearestmass';
console.log(`Connecting to database: ${dbUrl.replace(/:[^:@]+@/, ':***@')}`);
const pool = new Pool({
  connectionString: dbUrl,
  ssl: dbUrl.includes('neon') ? { rejectUnauthorized: false } : undefined,
});
const adapter = new PrismaPg(pool);
const prisma = new PrismaClient({ adapter });

import { findDuplicateChurch } from '../src/lib/church-matcher';
import type { ExistingChurch } from '../src/lib/church-matcher';

// ─── Constants ───────────────────────────────────────────────────────────────

const SITE_BASE = 'https://discovermass.com';
const SITEMAP_COUNT = 11;
const USER_AGENT = 'NearestMass-Importer/1.0 (parish data aggregator; contact: privacy@nearestmass.com)';
const REQUEST_DELAY_MS = 10_000; // Crawl-delay: 10 from robots.txt

// ─── Types ───────────────────────────────────────────────────────────────────

interface ParsedChurch {
  name: string;
  address: string | null;
  city: string | null;
  state: string | null;
  zip: string | null;
  phone: string | null;
  website: string | null;
  lat: number;
  lng: number;
}

interface ParsedMass {
  dayOfWeek: number; // 0=Sun, 1=Mon, ..., 6=Sat
  time: string;      // HH:MM 24-hour
  language: string;
  notes?: string;
}

interface ParsedConf {
  dayOfWeek: number;
  startTime: string; // HH:MM 24-hour
  endTime: string;   // HH:MM 24-hour
  notes?: string;
}

interface ParsedAdoration {
  dayOfWeek: number;
  startTime: string; // HH:MM 24-hour
  endTime: string;   // HH:MM 24-hour
  notes?: string;
}

interface ImportStats {
  total: number;
  created: number;
  updated: number;
  skipped: number;
  errors: number;
  massSchedulesCreated: number;
  confessionSchedulesCreated: number;
  adorationSchedulesCreated: number;
}

interface CLIArgs {
  all: boolean;
  dryRun: boolean;
  resumeFrom?: number;
  jobId?: string;
}

// ─── Day Mappings ─────────────────────────────────────────────────────────────

// Full day names used in mass schedule <li> labels
const FULL_DAY_NAMES: Record<string, number> = {
  Sunday: 0, Monday: 1, Tuesday: 2, Wednesday: 3,
  Thursday: 4, Friday: 5, Saturday: 6,
};

// Abbreviated day prefixes used in confession/adoration serviceTime text
const ABBREV_DAY_NAMES: Record<string, number[]> = {
  Sun: [0], Mon: [1], Tue: [2], Wed: [3],
  Thr: [4], Thu: [4], Fri: [5], Sat: [6],
  Weekdays: [1, 2, 3, 4, 5],
  Daily: [0, 1, 2, 3, 4, 5, 6],
};

// ─── Time Utilities ───────────────────────────────────────────────────────────

/**
 * Convert "5:00pm", "11:00am", "12:00pm", "12:00am" to "HH:MM" 24-hour format.
 * Returns the original string unchanged if it doesn't match expected format.
 */
function convertTo24h(timeStr: string): string {
  const cleaned = timeStr.trim().toLowerCase();
  const m = cleaned.match(/^(\d{1,2}):(\d{2})(am|pm)$/);
  if (!m) return cleaned;
  let hours = parseInt(m[1], 10);
  const mins = m[2];
  const meridiem = m[3];
  if (meridiem === 'pm' && hours !== 12) hours += 12;
  if (meridiem === 'am' && hours === 12) hours = 0;
  return `${String(hours).padStart(2, '0')}:${mins}`;
}

/**
 * Parse "8:30am-9:00am" → ["08:30", "09:00"].
 */
function parseTimeRange(rangeStr: string): [string, string] {
  const hyphenIdx = rangeStr.indexOf('-', rangeStr.indexOf(':') + 1);
  if (hyphenIdx === -1) {
    const t = convertTo24h(rangeStr.trim());
    return [t, t];
  }
  const start = convertTo24h(rangeStr.slice(0, hyphenIdx).trim());
  const end = convertTo24h(rangeStr.slice(hyphenIdx + 1).trim());
  return [start, end];
}

/**
 * Expand abbreviated day prefix to array of dayOfWeek integers.
 */
function expandDayAbbrev(prefix: string): number[] {
  return ABBREV_DAY_NAMES[prefix] ?? [];
}

// ─── Address Parsing ──────────────────────────────────────────────────────────

/**
 * Parse "14085 Peyton Drive, Chino Hills, CA 91709" into components.
 */
function parseAddress(raw: string): { address: string | null; city: string | null; state: string | null; zip: string | null } {
  const parts = raw.split(', ');
  if (parts.length < 3) return { address: raw, city: null, state: null, zip: null };
  const last = parts[parts.length - 1].trim();
  const stateZipMatch = last.match(/^([A-Z]{2})\s+(\d{5}(?:-\d{4})?)$/);
  if (!stateZipMatch) return { address: raw, city: null, state: null, zip: null };
  return {
    address: parts.slice(0, parts.length - 2).join(', ').trim(),
    city: parts[parts.length - 2].trim(),
    state: stateZipMatch[1],
    zip: stateZipMatch[2],
  };
}

// ─── HTML Parsing ─────────────────────────────────────────────────────────────

/**
 * Parse church metadata from page HTML.
 * Returns null if the page doesn't look like a valid church listing.
 */
function parseChurch(html: string): ParsedChurch | null {
  const nameMatch = html.match(/<meta property="og:title" content="([^"]+)"/);
  if (!nameMatch) return null;
  const name = nameMatch[1].trim();
  if (!name || name === 'Discover Mass') return null;

  let address: string | null = null;
  let city: string | null = null;
  let state: string | null = null;
  let zip: string | null = null;
  // Try structured <h2 id="theaddress"> element first (most reliable)
  const addrElemMatch = html.match(/id="theaddress"[^>]*>([^<]+)<\/h2>/);
  if (addrElemMatch) {
    const parsed = parseAddress(addrElemMatch[1].trim());
    address = parsed.address;
    city = parsed.city;
    state = parsed.state;
    zip = parsed.zip;
  } else {
    // Fallback: scan for street address pattern in text
    const addrMatch = html.match(/>\s*(\d+\s[^<\n,]{5,}),\s*([^<,\n]+),\s*([A-Z]{2})\s+(\d{5}(?:-\d{4})?)\s*</);
    if (addrMatch) {
      const raw = `${addrMatch[1].trim()}, ${addrMatch[2].trim()}, ${addrMatch[3]} ${addrMatch[4]}`;
      const parsed = parseAddress(raw);
      address = parsed.address;
      city = parsed.city;
      state = parsed.state;
      zip = parsed.zip;
    }
  }

  const phoneMatch = html.match(/<span class='side-phone attribute'>([^<]+)<\/span>/);
  const phone = phoneMatch ? phoneMatch[1].trim() : null;

  const websiteMatch = html.match(/<span class='side-website attribute'><a href='([^']+)'/);
  const website = websiteMatch ? websiteMatch[1].trim() : null;

  let lat = 0;
  let lng = 0;
  const coordMatch = html.match(/daddr=([-\d.]+),([-\d.]+)/);
  if (coordMatch) {
    const rawLat = parseFloat(coordMatch[1]);
    const rawLng = parseFloat(coordMatch[2]);
    if (isFinite(rawLat) && isFinite(rawLng) && Math.abs(rawLat) <= 90 && Math.abs(rawLng) <= 180) {
      lat = rawLat;
      lng = rawLng;
    }
  }

  return { name, address, city, state, zip, phone, website, lat, lng };
}

/**
 * Parse mass schedule from the "Mass Times" <ul> block.
 */
function parseMassTimes(html: string): ParsedMass[] {
  const safeHtml = html.length > 100_000 ? html.slice(0, 100_000) : html;
  const massUlMatch = safeHtml.match(/<ul>\s*<li>\s*<h5>Mass Times<\/h5>[\s\S]*?<\/ul>/);
  if (!massUlMatch) return [];
  const massUl = massUlMatch[0];

  const results: ParsedMass[] = [];
  const liParts = massUl.split(/<li[^>]*>/);
  for (let i = 1; i < liParts.length; i++) {
    const li = liParts[i];
    const labelMatch = li.match(/<span class="label">([^<]+)<\/span>/);
    if (!labelMatch) continue;
    const dayLabel = labelMatch[1].trim();
    const dayOfWeek = FULL_DAY_NAMES[dayLabel];
    if (dayOfWeek === undefined) continue;

    const serviceTimeParts = li.split("<span class='serviceTime'>");
    for (let j = 1; j < serviceTimeParts.length; j++) {
      const st = serviceTimeParts[j];
      const timeMatch = st.match(/<span class='time'>([^<]+)<\/span>/);
      if (!timeMatch) continue;
      const time = convertTo24h(timeMatch[1].trim());
      const langMatch = st.match(/<span class='language'>\(([^)]+)\)<\/span>/);
      const language = langMatch ? langMatch[1].trim() : 'English';
      const commentMatch = st.match(/<span class='comment'>([^<]+)<\/span>/);
      const notes = commentMatch ? commentMatch[1].trim() : undefined;
      results.push({ dayOfWeek, time, language, notes });
    }
  }
  return results;
}

/**
 * Parse confessions and adoration from the "Other Services" <ul> block.
 */
function parseOtherServices(html: string): { confessions: ParsedConf[]; adorations: ParsedAdoration[] } {
  const safeHtml = html.length > 100_000 ? html.slice(0, 100_000) : html;
  const otherUlMatch = safeHtml.match(/<ul>\s*<li>\s*<h5>Other Services<\/h5>[\s\S]*?<\/ul>/);
  if (!otherUlMatch) return { confessions: [], adorations: [] };
  const otherUl = otherUlMatch[0];

  function parseServiceItems(liHtml: string): Array<{ dayOfWeek: number; startTime: string; endTime: string; notes?: string }> {
    const items: Array<{ dayOfWeek: number; startTime: string; endTime: string; notes?: string }> = [];
    const stParts = liHtml.split("<span class='serviceTime'>");
    for (let i = 1; i < stParts.length; i++) {
      const st = stParts[i];
      const dayTimeMatch = st.match(/^([A-Za-z]+):\s*<span class='time'>([^<]+)<\/span>/);
      if (!dayTimeMatch) continue;
      const days = expandDayAbbrev(dayTimeMatch[1].trim());
      if (days.length === 0) continue;
      const [startTime, endTime] = parseTimeRange(dayTimeMatch[2]);
      const commentMatch = st.match(/<span class='comment'>([^<]+)<\/span>/);
      const notes = commentMatch ? commentMatch[1].trim() : undefined;
      for (const dayOfWeek of days) {
        items.push({ dayOfWeek, startTime, endTime, notes });
      }
    }
    return items;
  }

  const confessions: ParsedConf[] = [];
  const adorations: ParsedAdoration[] = [];
  const confMatch = otherUl.match(/<li class="Confessions">[\s\S]*?<\/li>/);
  if (confMatch) confessions.push(...parseServiceItems(confMatch[0]));
  const adorMatch = otherUl.match(/<li class="Adoration">[\s\S]*?<\/li>/);
  if (adorMatch) adorations.push(...parseServiceItems(adorMatch[0]));
  return { confessions, adorations };
}

// ─── HTTP Helpers ─────────────────────────────────────────────────────────────

async function fetchHtml(url: string): Promise<string> {
  const res = await fetch(url, { headers: { 'User-Agent': USER_AGENT } });
  if (!res.ok) throw new Error(`HTTP ${res.status} for ${url}`);
  return res.text();
}

function sleep(ms: number): Promise<void> {
  return new Promise(resolve => setTimeout(resolve, ms));
}

// ─── Sitemap Enumeration ──────────────────────────────────────────────────────

async function getAllChurchUrls(): Promise<string[]> {
  const urls: string[] = [];
  for (let i = 1; i <= SITEMAP_COUNT; i++) {
    const sitemapUrl = `${SITE_BASE}/wp-sitemap-posts-item-${i}.xml`;
    console.log(`Fetching sitemap ${i}/${SITEMAP_COUNT}...`);
    const xml = await fetchHtml(sitemapUrl);
    const matches = xml.matchAll(/<loc>(https:\/\/discovermass\.com\/church\/[^<]+)<\/loc>/g);
    for (const match of matches) {
      urls.push(match[1]);
    }
  }
  console.log(`Total church URLs: ${urls.length}`);
  return urls;
}

// ─── DB Helpers ───────────────────────────────────────────────────────────────

async function loadExistingChurches(): Promise<ExistingChurch[]> {
  console.log('Loading existing US churches from DB...');
  const churches = await prisma.church.findMany({
    where: { country: 'US' },
    select: {
      id: true, name: true, latitude: true, longitude: true,
      osmId: true, baiduId: true, masstimesId: true,
      orarimesseId: true, massSchedulesPhId: true, philmassId: true,
      horariosMisasId: true, mszeInfoId: true, weekdayMassesId: true,
      messesInfoId: true, bohosluzbyId: true, miserendId: true,
      kerknetId: true, gottesdienstzeitenId: true, discovermassId: true,
      source: true, website: true, phone: true, address: true, country: true,
    },
  });
  console.log(`Loaded ${churches.length} existing US churches`);
  return churches as ExistingChurch[];
}

// ─── Church Processing ────────────────────────────────────────────────────────

async function processChurch(
  url: string,
  existingChurches: ExistingChurch[],
  args: CLIArgs,
  stats: ImportStats,
): Promise<void> {
  const slug = url.replace('https://discovermass.com/church/', '').replace(/\/$/, '');
  stats.total++;

  try {
    const html = await fetchHtml(url);
    const parsed = parseChurch(html);
    if (!parsed) {
      console.log(`  [skip] Could not parse: ${slug}`);
      stats.skipped++;
      return;
    }

    const masses = parseMassTimes(html);
    const { confessions, adorations } = parseOtherServices(html);

    if (args.dryRun) {
      console.log(`  [dry-run] ${parsed.name} — ${masses.length} masses, ${confessions.length} confessions, ${adorations.length} adorations`);
      return;
    }

    const candidate = { name: parsed.name, lat: parsed.lat, lng: parsed.lng, discovermassId: slug };
    const duplicate = findDuplicateChurch(candidate, existingChurches);

    if (duplicate) {
      const updateData: Record<string, unknown> = { discovermassId: slug };
      if (!duplicate.phone && parsed.phone) updateData.phone = parsed.phone;
      if (!duplicate.website && parsed.website) {
        updateData.website = parsed.website;
        updateData.hasWebsite = true;
      }
      if (parsed.lat !== 0 && duplicate.latitude === 0) {
        updateData.latitude = parsed.lat;
        updateData.longitude = parsed.lng;
      }

      try {
        await prisma.$transaction(async (tx) => {
          await tx.church.update({ where: { id: duplicate.id }, data: updateData });
          if (masses.length > 0) {
            await tx.massSchedule.deleteMany({ where: { churchId: duplicate.id } });
            await tx.massSchedule.createMany({
              data: masses.map(m => ({ churchId: duplicate.id, dayOfWeek: m.dayOfWeek, time: m.time, language: m.language, notes: m.notes ?? null })),
            });
          }
          if (confessions.length > 0) {
            await tx.confessionSchedule.deleteMany({ where: { churchId: duplicate.id } });
            await tx.confessionSchedule.createMany({
              data: confessions.map(c => ({ churchId: duplicate.id, dayOfWeek: c.dayOfWeek, startTime: c.startTime, endTime: c.endTime, notes: c.notes ?? null })),
            });
          }
          if (adorations.length > 0) {
            await tx.adorationSchedule.deleteMany({ where: { churchId: duplicate.id } });
            await tx.adorationSchedule.createMany({
              data: adorations.map(a => ({ churchId: duplicate.id, dayOfWeek: a.dayOfWeek, startTime: a.startTime, endTime: a.endTime, notes: a.notes ?? null })),
            });
          }
          await tx.church.update({ where: { id: duplicate.id }, data: { lastScrapedAt: new Date() } });
        });
        duplicate.discovermassId = slug;
        stats.updated++;
      } catch (err) {
        if (err instanceof Error && err.message.includes('Unique constraint')) {
          stats.skipped++;
          return;
        }
        throw err;
      }
    } else {
      try {
        const church = await prisma.church.create({
          data: {
            name: parsed.name,
            address: parsed.address,
            city: parsed.city,
            state: parsed.state,
            zip: parsed.zip,
            country: 'US',
            phone: parsed.phone,
            website: parsed.website,
            hasWebsite: !!parsed.website,
            latitude: parsed.lat,
            longitude: parsed.lng,
            discovermassId: slug,
            source: 'discovermass',
          },
        });

        existingChurches.push({
          id: church.id, name: parsed.name, latitude: parsed.lat, longitude: parsed.lng,
          osmId: null, baiduId: null, masstimesId: null, orarimesseId: null,
          massSchedulesPhId: null, philmassId: null, horariosMisasId: null,
          mszeInfoId: null, weekdayMassesId: null, messesInfoId: null,
          bohosluzbyId: null, miserendId: null, kerknetId: null,
          gottesdienstzeitenId: null, discovermassId: slug,
          source: 'discovermass', website: parsed.website, phone: parsed.phone,
          address: parsed.address, country: 'US',
        });

        if (masses.length > 0) {
          await prisma.massSchedule.createMany({
            data: masses.map(m => ({ churchId: church.id, dayOfWeek: m.dayOfWeek, time: m.time, language: m.language, notes: m.notes ?? null })),
          });
        }
        if (confessions.length > 0) {
          await prisma.confessionSchedule.createMany({
            data: confessions.map(c => ({ churchId: church.id, dayOfWeek: c.dayOfWeek, startTime: c.startTime, endTime: c.endTime, notes: c.notes ?? null })),
          });
        }
        if (adorations.length > 0) {
          await prisma.adorationSchedule.createMany({
            data: adorations.map(a => ({ churchId: church.id, dayOfWeek: a.dayOfWeek, startTime: a.startTime, endTime: a.endTime, notes: a.notes ?? null })),
          });
        }
        await prisma.church.update({ where: { id: church.id }, data: { lastScrapedAt: new Date() } });
        stats.created++;
      } catch (err) {
        if (err instanceof Error && err.message.includes('Unique constraint')) {
          stats.skipped++;
          return;
        }
        throw err;
      }
    }

    stats.massSchedulesCreated += masses.length;
    stats.confessionSchedulesCreated += confessions.length;
    stats.adorationSchedulesCreated += adorations.length;

    console.log(
      `  [${duplicate ? 'update' : 'create'}] ${parsed.name} — ` +
      `${masses.length}M ${confessions.length}C ${adorations.length}A — ` +
      `${stats.total} total (${stats.created} new, ${stats.updated} upd, ${stats.errors} err)`
    );
  } catch (err) {
    stats.errors++;
    console.error(`  [error] ${slug}: ${err instanceof Error ? err.message : err}`);
  }
}

// ─── CLI Parsing ──────────────────────────────────────────────────────────────

function parseCLIArgs(): CLIArgs {
  const args = process.argv.slice(2);
  const result: CLIArgs = { all: false, dryRun: false };
  for (let i = 0; i < args.length; i++) {
    switch (args[i]) {
      case '--all': result.all = true; break;
      case '--dry-run': result.dryRun = true; break;
      case '--resume-from': result.resumeFrom = parseInt(args[++i], 10); break;
      case '--job-id': result.jobId = args[++i]; break;
    }
  }
  return result;
}

// ─── Main ─────────────────────────────────────────────────────────────────────

async function main() {
  const args = parseCLIArgs();

  if (!args.all) {
    console.error('Usage: npx tsx scripts/import-discovermass.ts --all [--dry-run] [--resume-from N] [--job-id UUID]');
    process.exit(1);
  }

  if (args.jobId) {
    try {
      await prisma.backgroundJob.update({
        where: { id: args.jobId },
        data: { status: 'running', startedAt: new Date() },
      });
    } catch { /* Job might not exist yet */ }
  }

  const stats: ImportStats = {
    total: 0, created: 0, updated: 0, skipped: 0, errors: 0,
    massSchedulesCreated: 0, confessionSchedulesCreated: 0, adorationSchedulesCreated: 0,
  };

  try {
    const urls = await getAllChurchUrls();
    const existingChurches = await loadExistingChurches();
    const startIdx = args.resumeFrom ?? 0;
    const churchUrls = urls.slice(startIdx);
    console.log(`\nProcessing ${churchUrls.length} churches (starting from index ${startIdx})...\n`);

    for (let i = 0; i < churchUrls.length; i++) {
      const url = churchUrls[i];
      const overallIdx = startIdx + i;
      console.log(`[${overallIdx + 1}/${urls.length}] ${url}`);
      await processChurch(url, existingChurches, args, stats);
      if (i < churchUrls.length - 1) {
        await sleep(REQUEST_DELAY_MS);
      }
    }
  } finally {
    console.log('\n─── Import Complete ───────────────────────────────────────');
    console.log(`Total processed:    ${stats.total}`);
    console.log(`Created:            ${stats.created}`);
    console.log(`Updated:            ${stats.updated}`);
    console.log(`Skipped:            ${stats.skipped}`);
    console.log(`Errors:             ${stats.errors}`);
    console.log(`Mass schedules:     ${stats.massSchedulesCreated}`);
    console.log(`Confession sched:   ${stats.confessionSchedulesCreated}`);
    console.log(`Adoration sched:    ${stats.adorationSchedulesCreated}`);

    if (args.jobId) {
      const status = stats.errors > stats.total * 0.1 ? 'failed' : 'completed';
      try {
        await prisma.backgroundJob.update({
          where: { id: args.jobId },
          data: {
            status,
            completedAt: new Date(),
            processed: stats.total,
            succeeded: stats.created + stats.updated,
            failed: stats.errors,
            itemsFound: stats.massSchedulesCreated,
          },
        });
      } catch { /* Ignore */ }
    }

    await prisma.$disconnect();
    await pool.end();
  }
}

main().catch((err) => {
  console.error('Fatal error:', err);
  process.exit(1);
});