/**
 * Slack Service — 3-Layer Data Delivery
 * 
 * Layer 1: Daily Digest (1 rich message per day — summary table)
 * Layer 2: Real-time Alerts (only HOT leads 85+ — immediate)
 * Layer 3: Commands (/leads, /discover, /status, /pause, /quota)
 * 
 * NOT Slack blast — organized, formatted, actionable.
 */

import axios from "axios";
import { getEnv } from "../shared/config/env";
import { getSupabaseClient } from "../shared/supabase/client";
import { logger } from "../shared/utils/logger";

// ─── Slack API helper ────────────────────────────────────────

async function postMessage(channelId: string, blocks: unknown[], text: string): Promise<void> {
  const env = getEnv();
  try {
    await axios.post("https://slack.com/api/chat.postMessage", {
      channel: channelId,
      text,
      blocks,
    }, {
      headers: { Authorization: `Bearer ${env.SLACK_BOT_TOKEN}` },
      timeout: 5_000,
    });
  } catch (err) {
    logger.warn({ err }, "Slack post failed — non-critical");
  }
}

// ─── LAYER 1: Daily Digest ───────────────────────────────────

export async function sendDailyDigest(runSummary: {
  territory: string;
  industry: string;
  companiesSearched: number;
  leadsQualified: number;
  hotLeads: number;
  warmLeads: number;
  nurtureLeads: number;
  tokensUsed: number;
  durationMinutes: number;
}): Promise<void> {
  const env = getEnv();
  const db = getSupabaseClient();

  // Fetch today's qualified leads
  const today = new Date();
  today.setHours(0, 0, 0, 0);

  const { data: leads } = await db
    .from("lead_scores")
    .select(`
      total_score, tier,
      companies (name, domain, industry, employee_count, city, service_match),
      contacts (full_name, title, email, email_verified, linkedin_personal_url)
    `)
    .gte("created_at", today.toISOString())
    .order("total_score", { ascending: false })
    .limit(20);

  // Build lead table
  const leadRows = (leads ?? []).map((lead: any, i: number) => {
    const emoji = lead.tier === "hot" ? "🔥" : lead.tier === "warm" ? "✅" : "📋";
    const company = lead.companies;
    const contact = lead.contacts;
    const emailIcon = contact?.email_verified ? "📧✓" : contact?.email ? "📧" : "—";
    const linkedinIcon = contact?.linkedin_personal_url ? "💼✓" : "—";

    return `${emoji} *${company?.name ?? "Unknown"}* — ${lead.total_score}/100 ${lead.tier.toUpperCase()}\n` +
      `    ${company?.industry ?? "?"} · ${company?.employee_count ?? "?"} emp · ${company?.city ?? "?"}\n` +
      `    ${contact?.full_name ?? "?"} (${contact?.title ?? "?"})\n` +
      `    ${emailIcon} ${linkedinIcon} · Match: ${company?.service_match ?? "—"}`;
  }).join("\n\n");

  const blocks = [
    // Header
    {
      type: "header",
      text: { type: "plain_text", text: `📊 Daily Lead Report — ${formatDate(new Date())}` },
    },
    // Summary stats
    {
      type: "section",
      text: {
        type: "mrkdwn",
        text: `*Territory:* ${runSummary.territory} → ${runSummary.industry}\n` +
          `*Searched:* ${runSummary.companiesSearched} companies\n` +
          `*Qualified:* ${runSummary.leadsQualified} leads ` +
          `(🔥 ${runSummary.hotLeads} hot · ✅ ${runSummary.warmLeads} warm · 📋 ${runSummary.nurtureLeads} nurture)\n` +
          `*Duration:* ${runSummary.durationMinutes} min · *Tokens:* ${runSummary.tokensUsed.toLocaleString()}`,
      },
    },
    { type: "divider" },
    // Lead list
    {
      type: "section",
      text: {
        type: "mrkdwn",
        text: leadRows || "_No qualified leads found today_",
      },
    },
    { type: "divider" },
    // Actions
    {
      type: "context",
      elements: [
        {
          type: "mrkdwn",
          text: "Type `/leads` for full details · `/discover region:UK` for manual run · `/status` for system status",
        },
      ],
    },
  ];

  await postMessage(env.SLACK_ALERT_CHANNEL_ID, blocks,
    `Daily Report: ${runSummary.leadsQualified} leads found`);
}

// ─── LAYER 2: Hot Lead Alert (85+ only) ──────────────────────

export async function sendHotLeadAlert(lead: {
  companyName: string;
  domain: string;
  industry: string;
  employeeCount: number | null;
  city: string | null;
  score: number;
  tier: string;
  contactName: string;
  contactTitle: string;
  email: string | null;
  emailVerified: boolean;
  linkedinPersonal: string | null;
  linkedinCompany: string | null;
  serviceMatch: string | null;
  outreachAngle: string;
  painPoints: string[];
  socialProfiles: Record<string, string | null>;
}): Promise<void> {
  const env = getEnv();
  const emoji = lead.score >= 90 ? "🔥🔥🔥" : lead.score >= 85 ? "🔥🔥" : "🔥";

  // Contact channels summary
  const channels: string[] = [];
  if (lead.email && lead.emailVerified) channels.push(`📧 ${lead.email} ✓`);
  else if (lead.email) channels.push(`📧 ${lead.email} (unverified)`);
  if (lead.linkedinPersonal) channels.push(`💼 <${lead.linkedinPersonal}|LinkedIn>`);
  if (lead.linkedinCompany) channels.push(`🏢 <${lead.linkedinCompany}|Company LI>`);
  if (lead.socialProfiles?.instagram) channels.push(`📷 <${lead.socialProfiles.instagram}|Instagram>`);
  if (lead.socialProfiles?.facebook) channels.push(`👥 <${lead.socialProfiles.facebook}|Facebook>`);

  const blocks = [
    {
      type: "header",
      text: { type: "plain_text", text: `${emoji} HOT LEAD — ${lead.companyName}` },
    },
    {
      type: "section",
      fields: [
        { type: "mrkdwn", text: `*Score:*\n${lead.score}/100 — ${lead.tier.toUpperCase()}` },
        { type: "mrkdwn", text: `*Industry:*\n${lead.industry}` },
        { type: "mrkdwn", text: `*Employees:*\n${lead.employeeCount ?? "Unknown"}` },
        { type: "mrkdwn", text: `*Location:*\n${lead.city ?? "Unknown"}` },
        { type: "mrkdwn", text: `*Service Match:*\n${lead.serviceMatch ?? "General"}` },
        { type: "mrkdwn", text: `*Domain:*\n${lead.domain}` },
      ],
    },
    { type: "divider" },
    {
      type: "section",
      text: {
        type: "mrkdwn",
        text: `*👤 Decision Maker:*\n${lead.contactName} — ${lead.contactTitle}\n\n` +
          `*📱 Channels:*\n${channels.join("\n") || "None found"}\n\n` +
          `*🎯 Outreach Angle:*\n_"${lead.outreachAngle}"_\n\n` +
          `*💢 Pain Points:*\n${lead.painPoints.map(p => `• ${p}`).join("\n")}`,
      },
    },
  ];

  await postMessage(env.SLACK_ALERT_CHANNEL_ID, blocks,
    `🔥 HOT LEAD: ${lead.companyName} — Score ${lead.score}`);
}

// ─── LAYER 2: Run Progress Updates ──────────────────────────

export async function sendRunStarted(territory: string, industry: string, quota: number): Promise<void> {
  const env = getEnv();
  await postMessage(env.SLACK_ALERT_CHANNEL_ID, [
    {
      type: "section",
      text: {
        type: "mrkdwn",
        text: `🚀 *Daily run started*\n` +
          `Territory: ${territory} → ${industry}\n` +
          `Quota: ${quota} leads\n` +
          `Estimated: ~90 min`,
      },
    },
  ], `Run started: ${territory} ${industry}`);
}

export async function sendRunProgress(qualified: number, quota: number, searched: number): Promise<void> {
  const env = getEnv();
  const progress = Math.round((qualified / quota) * 100);
  const bar = "█".repeat(Math.round(progress / 10)) + "░".repeat(10 - Math.round(progress / 10));

  await postMessage(env.SLACK_ALERT_CHANNEL_ID, [
    {
      type: "section",
      text: {
        type: "mrkdwn",
        text: `📊 *Progress:* ${qualified}/${quota} qualified [${bar}] ${progress}%\n` +
          `Searched: ${searched} companies`,
      },
    },
  ], `Progress: ${qualified}/${quota}`);
}

// ─── LAYER 3: Clarifying Questions ──────────────────────────

export async function sendClarifyingQuestions(
  userMessage: string,
  questions: { question: string; options: string[] }[]
): Promise<void> {
  const env = getEnv();

  const blocks: unknown[] = [
    {
      type: "section",
      text: {
        type: "mrkdwn",
        text: `🤔 *Got it: "${userMessage}"*\nMujhe kuch clarify karna hai:`,
      },
    },
  ];

  for (const q of questions) {
    blocks.push({
      type: "section",
      text: {
        type: "mrkdwn",
        text: `*${q.question}*\n${q.options.map((o, i) => `${i + 1}. ${o}`).join("\n")}`,
      },
    });
  }

  blocks.push({
    type: "context",
    elements: [{
      type: "mrkdwn",
      text: "Just reply with numbers (e.g., `1 2 3`) or type your own answer",
    }],
  });

  await postMessage(env.SLACK_ALERT_CHANNEL_ID, blocks,
    "Clarifying questions for manual discovery");
}

// ─── Helpers ─────────────────────────────────────────────────

function formatDate(date: Date): string {
  return date.toLocaleDateString("en-US", {
    weekday: "long",
    year: "numeric",
    month: "long",
    day: "numeric",
  });
}