/**
 * Trigger.dev Task Definitions — Phase 1 Pipeline
 * 
 * 5 chained tasks instead of 1 monolithic function:
 * 
 * Task 1: daily-scheduler    → CRON 4 AM UTC → picks territory → triggers process-company
 * Task 2: process-company    → scrape + pain detect + gate 2 → triggers enrich-contacts
 * Task 3: enrich-contacts    → emails + classify + verify + LinkedIn + social → triggers ai-profile
 * Task 4: ai-profile-score   → Python service → save → triggers hot-alert if needed
 * Task 5: daily-digest       → CRON 6:30 AM UTC → collects today's results → Slack digest
 * 
 * Benefits:
 *   - Company #3 fails → only #3 retries, rest continue
 *   - 3 companies process in parallel (concurrency limit)
 *   - Each task has its own retry policy
 *   - Dashboard shows exact failure point
 */

import { task, schedules, queue } from "@trigger.dev/sdk/v3";
import { getSupabaseClient } from "../../shared/supabase/client";
import { startTrace, recordOperation, endTrace } from "../../shared/observability/tracer";
import { saveCheckpoint, isAlreadyProcessed } from "../../shared/pipeline/checkpoint";
import { getNextTerritory, getDailyQuota, markTerritorySearched, isSystemPaused, buildTerritoryQueries } from "../lib/territory-manager";
import { scrapeCompanyWebsite } from "../lib/web-scraper";
import { detectPainSignals } from "../lib/pain-signal-detector";
import { enrichContacts } from "../lib/contact-enricher";
import { sendRunStarted, sendRunProgress, sendDailyDigest, sendHotLeadAlert } from "../../slack/slack-service";
import { logger } from "../../shared/utils/logger";
import { randomUUID } from "crypto";
import axios from "axios";
import { getEnv } from "../../shared/config/env";

// ─── Queue: max 3 companies processing simultaneously ────────
const companyQueue = queue({
  name: "company-processing",
  concurrencyLimit: 3,
});


// ═══════════════════════════════════════════════════════════════
// TASK 1: Daily Scheduler (CRON — runs every day at 4 AM UTC)
// ═══════════════════════════════════════════════════════════════

export const dailyScheduler = schedules.task({
  id: "daily-lead-discovery",
  // Cron configured in Trigger.dev dashboard: 0 4 * * * (4 AM UTC = 9 AM PKT)
  maxDuration: 300, // 5 minutes for setup
  run: async () => {
    // Pre-flight
    if (await isSystemPaused()) {
      logger.info("⏸️ System paused — skipping today");
      return { status: "paused" };
    }

    const quota = await getDailyQuota();
    const territories = await getNextTerritory(quota);

    if (territories.length === 0) {
      logger.warn("No fresh territory — all cooling down");
      return { status: "no_territory" };
    }

    // Create run record
    const db = getSupabaseClient();
    const runId = randomUUID();
    const traceId = startTrace(runId);
    const unit = territories[0];

    await db.from("discovery_runs").insert({
      id: runId,
      run_type: "auto",
      territory_id: unit.territoryId,
      country_code: unit.countryCode,
      city: unit.city,
      industry: unit.industry,
      quota_target: quota,
      status: "running",
      triggered_by: "system",
    });

    // Slack: run started
    await sendRunStarted(`${unit.city}, ${unit.country}`, unit.industry, quota);

    // Search Google for companies
    const env = getEnv();
    const allDomains: string[] = [];

    for (const territory of territories) {
      const queries = buildTerritoryQueries(territory, []);
      
      for (const query of queries) {
        try {
          const response = await axios.post(
            "https://google.serper.dev/search",
            { q: query, num: 10 },
            {
              headers: { "X-API-KEY": env.SERPER_API_KEY, "Content-Type": "application/json" },
              timeout: 8_000,
            }
          );

          const organic = response.data?.organic ?? [];
          for (const result of organic) {
            try {
              const hostname = new URL(result.link).hostname.replace(/^www\./, "");
              const skip = ["facebook.com", "linkedin.com", "twitter.com", "instagram.com",
                "youtube.com", "yelp.com", "yellowpages.com", "bbb.org", "wikipedia.org",
                "reddit.com", "crunchbase.com", "glassdoor.com"];
              if (!skip.some(s => hostname.includes(s)) && !allDomains.includes(hostname)) {
                allDomains.push(hostname);
              }
            } catch { /* invalid URL */ }
          }
        } catch (err) {
          logger.warn({ query, err }, "Serper search failed — continuing");
        }
      }
    }

    logger.info({ domains: allDomains.length, territory: unit.city }, "Domains found — triggering company tasks");

    // Trigger Task 2 for each domain (queued, max 3 concurrent)
    const companyTasks = [];
    for (const domain of allDomains) {
      // Skip already processed
      if (await isAlreadyProcessed(domain, 30)) continue;

      companyTasks.push(
        processCompany.trigger({
          domain,
          runId,
          traceId,
          industry: unit.industry,
          city: unit.city,
          country: unit.country,
          countryCode: unit.countryCode,
          territoryId: unit.territoryId,
          quota,
          linkedInUrl: null,
        })
      );
    }

    // Wait for all company tasks
    const results = await Promise.allSettled(companyTasks);
    const succeeded = results.filter(r => r.status === "fulfilled").length;

    // Mark territory searched
    await markTerritorySearched(unit.territoryId, unit.industry, succeeded);

    // Update run
    await db.from("discovery_runs").update({
      status: "completed",
      companies_found: allDomains.length,
      completed_at: new Date().toISOString(),
      search_queries: buildTerritoryQueries(unit, []),
    }).eq("id", runId);

    await endTrace(traceId);

    return {
      status: "completed",
      domainsFound: allDomains.length,
      tasksTriggered: companyTasks.length,
      succeeded,
    };
  },
});


// ═══════════════════════════════════════════════════════════════
// TASK 2: Process Company (per company, queued)
// ═══════════════════════════════════════════════════════════════

export const processCompany = task({
  id: "process-company",
  queue: companyQueue,
  retry: {
    maxAttempts: 2,
    minTimeoutInMs: 5_000,
    maxTimeoutInMs: 30_000,
    factor: 2,
  },
  maxDuration: 120, // 2 minutes per company
  run: async (payload: {
    domain: string;
    runId: string;
    traceId: string;
    industry: string;
    city: string;
    country: string;
    countryCode: string;
    territoryId: string;
    quota: number;
    linkedInUrl: string | null;
  }) => {
    const { domain, runId, traceId, industry, city, country } = payload;

    logger.info({ domain }, "Processing company");

    // ── Stage 1: Scrape website ────────────────────────────────
    const websiteData = await scrapeCompanyWebsite(domain);
    if (!websiteData?.text) {
      await saveCheckpoint(runId, domain, "completed", { reason: "no_website" });
      return { status: "skipped", reason: "no_website_data" };
    }

    await saveCheckpoint(runId, domain, "scraped");

    // ── Stage 2: Pain signal detection + Gate 2 ────────────────
    const painResult = await detectPainSignals(
      websiteData.name ?? domain,
      industry,
      websiteData.employeeCount ?? null,
      websiteData.text ?? "",
      websiteData.html ?? "",
      traceId
    );

    // Gate 2: minimum 2 pain signals OR service match
    if (painResult.painSignals.length < 2 && !painResult.serviceMatch) {
      await saveCheckpoint(runId, domain, "completed", { reason: "gate2_failed" });
      return { status: "skipped", reason: "gate2_failed" };
    }

    await saveCheckpoint(runId, domain, "filtered");

    // ── Trigger Task 3: Enrich contacts ────────────────────────
    const enrichResult = await enrichAndProfile.trigger({
      domain,
      runId,
      traceId,
      industry,
      city,
      country,
      companyName: websiteData.name ?? domain,
      employeeCount: websiteData.employeeCount ?? null,
      description: websiteData.description ?? "",
      websiteText: (websiteData.text ?? "").slice(0, 800),
      websiteHtml: (websiteData.html ?? "").slice(0, 5000),
      techStack: websiteData.techStack ?? [],
      aiJobCount: websiteData.aiJobCount ?? 0,
      linkedInUrl: websiteData.linkedinUrl ?? null,
      painSignals: painResult.painSignals.map(p => p.signal),
      serviceMatch: painResult.serviceMatch,
      matchConfidence: painResult.matchConfidence,
    });

    return { status: "passed_to_enrichment", domain };
  },
});


// ═══════════════════════════════════════════════════════════════
// TASK 3: Enrich Contacts + AI Profile + Score (combined)
// ═══════════════════════════════════════════════════════════════

export const enrichAndProfile = task({
  id: "enrich-and-profile",
  retry: {
    maxAttempts: 2,
    minTimeoutInMs: 3_000,
    maxTimeoutInMs: 20_000,
    factor: 2,
  },
  maxDuration: 180, // 3 minutes (email verification can be slow)
  run: async (payload: {
    domain: string;
    runId: string;
    traceId: string;
    industry: string;
    city: string;
    country: string;
    companyName: string;
    employeeCount: number | null;
    description: string;
    websiteText: string;
    websiteHtml: string;
    techStack: string[];
    aiJobCount: number;
    linkedInUrl: string | null;
    painSignals: string[];
    serviceMatch: string | null;
    matchConfidence: number;
  }) => {
    const db = getSupabaseClient();
    const env = getEnv();

    // ── Step 1: Enrich contacts ──────────────────────────────
    const contacts = await enrichContacts(
      "",
      payload.domain,
      payload.companyName,
      payload.employeeCount,
      payload.industry,
      payload.websiteText.slice(0, 300),
      payload.websiteHtml,
      payload.linkedInUrl,
      payload.traceId
    );

    if (contacts.length === 0) {
      await saveCheckpoint(payload.runId, payload.domain, "completed", { reason: "no_contacts" });
      return { status: "skipped", reason: "no_contacts" };
    }

    // Must have authority-confirmed contact
    const authorityContacts = contacts.filter(c => c.authorityConfirmed);
    if (authorityContacts.length === 0) {
      await saveCheckpoint(payload.runId, payload.domain, "completed", { reason: "no_authority" });
      return { status: "skipped", reason: "no_authority_contacts" };
    }

    await saveCheckpoint(payload.runId, payload.domain, "emails_verified");

    // ── Step 2: Save company ─────────────────────────────────
    const companyId = randomUUID();
    await db.from("companies").upsert({
      id: companyId,
      domain: payload.domain,
      name: payload.companyName,
      industry: payload.industry,
      employee_count: payload.employeeCount,
      description: payload.description,
      website_status: "active",
      linkedin_url: payload.linkedInUrl,
      tech_stack: payload.techStack,
      country: payload.country,
      city: payload.city,
      service_match: payload.serviceMatch,
      service_match_score: Math.round(payload.matchConfidence * 100),
      pain_signals: payload.painSignals,
      trace_id: payload.traceId,
    }, { onConflict: "domain" });

    // Update contacts with company_id
    for (const contact of contacts) {
      await db.from("contacts").update({ company_id: companyId }).eq("id", contact.id);
    }

    // ── Step 3: AI Profile + Score (Python service) ──────────
    const profileResponse = await axios.post(
      `${env.PYTHON_AI_SERVICE_URL}/profile`,
      {
        company: {
          id: companyId,
          name: payload.companyName,
          industry: payload.industry,
          employee_count: payload.employeeCount,
          description: payload.description,
          website_text: payload.websiteText,
          linkedin_description: "",
          tech_stack: payload.techStack,
          ai_job_count: payload.aiJobCount,
          pain_signals: payload.painSignals,
          service_match: payload.serviceMatch,
        },
        contacts: contacts.map(c => ({
          full_name: c.fullName,
          email: c.email,
          email_verified: c.emailVerification?.status === "verified_deliverable",
          linkedin_personal_url: c.linkedinPersonalUrl,
          social_profiles: c.socialProfiles ?? {},
        })),
        trace_id: payload.traceId,
      },
      {
        headers: { Authorization: `Bearer ${env.PYTHON_AI_SERVICE_SECRET}` },
        timeout: 45_000,
      }
    );

    const profile = profileResponse.data?.profile;
    const score = profileResponse.data?.score;
    const totalScore = score?.total_score ?? 0;
    const tier = score?.tier ?? "archive";

    // Save profile and score
    await db.from("lead_profiles").upsert({
      company_id: companyId,
      ...profile,
    }, { onConflict: "company_id" });

    await db.from("lead_scores").upsert({
      company_id: companyId,
      ...score,
    }, { onConflict: "company_id" });

    // Update run stats
    if (totalScore >= 70) {
      await db.rpc("increment_run_leads", { run_id: payload.runId });
    }

    await saveCheckpoint(payload.runId, payload.domain, "completed");

    // ── Step 4: Hot lead alert (85+) ─────────────────────────
    if (totalScore >= 85) {
      const best = authorityContacts[0];
      await sendHotLeadAlert({
        companyName: payload.companyName,
        domain: payload.domain,
        industry: payload.industry,
        employeeCount: payload.employeeCount,
        city: payload.city,
        score: totalScore,
        tier,
        contactName: best.fullName,
        contactTitle: best.title ?? "",
        email: best.email,
        emailVerified: best.emailVerification?.status === "verified_deliverable",
        linkedinPersonal: best.linkedinPersonalUrl,
        linkedinCompany: payload.linkedInUrl,
        serviceMatch: payload.serviceMatch,
        outreachAngle: profile?.outreach_angle ?? "",
        painPoints: (profile?.pain_points ?? []).slice(0, 3),
        socialProfiles: best.socialProfiles ?? {},
      });
    }

    recordOperation(payload.traceId, "enrich_and_profile", score?.tokens_used ?? 0, 0, true);

    return {
      status: "completed",
      domain: payload.domain,
      score: totalScore,
      tier,
      contactsFound: contacts.length,
      authorityConfirmed: authorityContacts.length,
      hasLinkedIn: contacts.some(c => c.linkedinPersonalUrl),
    };
  },
});


// ═══════════════════════════════════════════════════════════════
// TASK 4: Daily Digest (CRON — runs at 6:30 AM UTC = 11:30 AM PKT)
// ═══════════════════════════════════════════════════════════════

export const dailyDigestTask = schedules.task({
  id: "daily-digest",
  // Cron configured in Trigger.dev dashboard: 30 6 * * * (6:30 AM UTC)
  maxDuration: 60,
  run: async () => {
    const db = getSupabaseClient();
    const today = new Date();
    today.setHours(0, 0, 0, 0);

    // Get today's run stats
    const { data: runs } = await db
      .from("discovery_runs")
      .select("*")
      .gte("ran_at", today.toISOString());

    const latestRun = runs?.[0];
    if (!latestRun) {
      logger.info("No runs today — skipping digest");
      return;
    }

    // Count today's leads by tier
    const { data: scores } = await db
      .from("lead_scores")
      .select("total_score, tier")
      .gte("created_at", today.toISOString());

    const hotLeads = scores?.filter(s => s.tier === "hot").length ?? 0;
    const warmLeads = scores?.filter(s => s.tier === "warm").length ?? 0;
    const nurtureLeads = scores?.filter(s => s.tier === "nurture").length ?? 0;

    // Get token usage
    const { data: traces } = await db
      .from("llm_traces")
      .select("total_tokens")
      .gte("created_at", today.toISOString());

    const totalTokens = traces?.reduce((sum, t) => sum + (t.total_tokens ?? 0), 0) ?? 0;

    await sendDailyDigest({
      territory: `${latestRun.city}, ${latestRun.country_code}`,
      industry: latestRun.industry,
      companiesSearched: latestRun.companies_found ?? 0,
      leadsQualified: (scores?.length ?? 0),
      hotLeads,
      warmLeads,
      nurtureLeads,
      tokensUsed: totalTokens,
      durationMinutes: latestRun.completed_at
        ? Math.round((new Date(latestRun.completed_at).getTime() - new Date(latestRun.ran_at).getTime()) / 60_000)
        : 0,
    });

    return { sent: true, leads: scores?.length ?? 0 };
  },
});


// ═══════════════════════════════════════════════════════════════
// TASK 5: Manual Discovery (triggered from Slack)
// ═══════════════════════════════════════════════════════════════

export const manualDiscoveryTask = task({
  id: "manual-discovery",
  maxDuration: 300,
  run: async (payload: {
    region: string;
    industry: string;
    maxCompanies: number;
    triggeredBy: string;
  }) => {
    // Reuse the daily scheduler logic but with custom territory
    logger.info({ payload }, "Manual discovery triggered from Slack");

    // TODO: Build custom territory from region param
    // For now, trigger the same pipeline
    return { status: "manual_run_started", ...payload };
  },
});