/**
 * Content Director Engine v2
 *
 * Deterministic content planning agent that generates a 4-week editorial
 * calendar by combining channel strategies, content pillars, clinic services,
 * and existing assets. No AI API calls — all logic is data-driven.
 *
 * v2 changes (Audit-driven):
 * - Added 강남언니, TikTok, YouTube Live/Community slots
 * - Added Instagram Feed slot, Naver column format
 * - Split Facebook into organic/ad
 * - 5th Pillar: 안전·케어
 * - Customer journey-based week themes
 * - Channel-specific tone matrix
 * - Keyword-driven topic generation
 */

import type {
  ChannelStrategyCard,
  ContentPillar,
  CalendarWeek,
  CalendarEntry,
  ContentCountSummary,
  ContentCategory,
} from '../types/plan';

// ─── Input / Output Types ───

export interface ContentDirectorInput {
  channels: ChannelStrategyCard[];
  pillars: ContentPillar[];
  services: string[];
  youtubeVideos?: { title: string; views: number; type: 'Short' | 'Long' }[];
  clinicName: string;
  keywords?: { keyword: string; monthlySearches?: number }[];
  gangnamUnniData?: { rating?: number; reviews?: number; doctors?: number };
}

export interface ContentDirectorOutput {
  weeks: CalendarWeek[];
  monthlySummary: ContentCountSummary[];
}

// ─── Channel-Format Slot Definitions ───

interface FormatSlot {
  channel: string;
  channelIcon: string;
  format: string;
  contentType: ContentCategory;
  preferredDays: number[];  // 0=월 ~ 6=일
  perWeek: number;
  titleTemplate: (topic: string, idx: number) => string;
  tone: string;
  journeyStage: 'awareness' | 'interest' | 'consideration' | 'conversion' | 'loyalty';
}

// ─── YouTube: 4 formats ───
const YOUTUBE_SLOTS: FormatSlot[] = [
  {
    channel: 'YouTube', channelIcon: 'youtube', format: 'Shorts',
    contentType: 'video', preferredDays: [0, 2, 4], perWeek: 3,
    titleTemplate: (t, i) => `Shorts: ${t} #${i + 1}`,
    tone: '캐주얼·후킹', journeyStage: 'awareness',
  },
  {
    channel: 'YouTube', channelIcon: 'youtube', format: 'Long-form',
    contentType: 'video', preferredDays: [3], perWeek: 1,
    titleTemplate: (t) => `${t} 상세 설명`,
    tone: '교육적·권위', journeyStage: 'interest',
  },
  {
    channel: 'YouTube', channelIcon: 'youtube', format: 'Live Q&A',
    contentType: 'video', preferredDays: [5], perWeek: 1,
    titleTemplate: (t) => `Live: ${t} 실시간 Q&A`,
    tone: '친근·대화', journeyStage: 'consideration',
  },
  {
    channel: 'YouTube', channelIcon: 'youtube', format: 'Community',
    contentType: 'social', preferredDays: [1, 4], perWeek: 2,
    titleTemplate: (t) => `[커뮤니티] ${t} 투표/질문`,
    tone: '친근·참여유도', journeyStage: 'loyalty',
  },
];

// ─── Instagram: 4 formats ───
const INSTAGRAM_SLOTS: FormatSlot[] = [
  {
    channel: 'Instagram', channelIcon: 'instagram', format: 'Reel',
    contentType: 'video', preferredDays: [0, 2, 4], perWeek: 3,
    titleTemplate: (t, i) => `Reel: ${t} #${i + 1}`,
    tone: '트렌디·공감', journeyStage: 'awareness',
  },
  {
    channel: 'Instagram', channelIcon: 'instagram', format: 'Carousel',
    contentType: 'social', preferredDays: [1, 4], perWeek: 2,
    titleTemplate: (t) => `Carousel: ${t}`,
    tone: '정보성·교육', journeyStage: 'interest',
  },
  {
    channel: 'Instagram', channelIcon: 'instagram', format: 'Feed',
    contentType: 'social', preferredDays: [3], perWeek: 1,
    titleTemplate: (t) => `Feed: ${t} 포트폴리오`,
    tone: '감성적·프리미엄', journeyStage: 'consideration',
  },
  {
    channel: 'Instagram', channelIcon: 'instagram', format: 'Stories',
    contentType: 'social', preferredDays: [2, 5], perWeek: 2,
    titleTemplate: (t) => `Stories: ${t}`,
    tone: '친근·일상', journeyStage: 'loyalty',
  },
];

// ─── 강남언니: 3 formats (Audit C1) ───
const GANGNAMUNNI_SLOTS: FormatSlot[] = [
  {
    channel: '강남언니', channelIcon: 'star', format: '리뷰관리',
    contentType: 'social', preferredDays: [1, 4], perWeek: 2,
    titleTemplate: (t) => `리뷰 응대: ${t}`,
    tone: '전문·응대', journeyStage: 'consideration',
  },
  {
    channel: '강남언니', channelIcon: 'star', format: '프로필최적화',
    contentType: 'social', preferredDays: [0], perWeek: 1,
    titleTemplate: (t) => `프로필 업데이트: ${t}`,
    tone: '전문·신뢰', journeyStage: 'consideration',
  },
  {
    channel: '강남언니', channelIcon: 'star', format: '이벤트/가격',
    contentType: 'ad', preferredDays: [3], perWeek: 1,
    titleTemplate: (t) => `이벤트: ${t}`,
    tone: '프로모션·CTA', journeyStage: 'conversion',
  },
];

// ─── TikTok: 1 format (Audit C2) ───
const TIKTOK_SLOTS: FormatSlot[] = [
  {
    channel: 'TikTok', channelIcon: 'video', format: '숏폼',
    contentType: 'video', preferredDays: [0, 2, 4], perWeek: 3,
    titleTemplate: (t, i) => `TikTok: ${t} #${i + 1}`,
    tone: '밈·교육', journeyStage: 'awareness',
  },
];

// ─── 네이버 블로그: 2 formats (Audit H3) ───
const NAVER_SLOTS: FormatSlot[] = [
  {
    channel: '네이버 블로그', channelIcon: 'blog', format: 'SEO글',
    contentType: 'blog', preferredDays: [1, 3], perWeek: 2,
    titleTemplate: (t) => `${t}`,
    tone: '정보성·SEO', journeyStage: 'interest',
  },
  {
    channel: '네이버 블로그', channelIcon: 'blog', format: '의사칼럼',
    contentType: 'blog', preferredDays: [5], perWeek: 1,
    titleTemplate: (t) => `[칼럼] ${t}`,
    tone: '전문·교육', journeyStage: 'consideration',
  },
];

// ─── Facebook: organic + ad (Audit H4) ───
const FACEBOOK_SLOTS: FormatSlot[] = [
  {
    channel: 'Facebook', channelIcon: 'facebook', format: '오가닉',
    contentType: 'social', preferredDays: [2], perWeek: 1,
    titleTemplate: (t) => `${t}`,
    tone: '커뮤니티·공유', journeyStage: 'interest',
  },
  {
    channel: 'Facebook', channelIcon: 'facebook', format: '광고',
    contentType: 'ad', preferredDays: [4, 6], perWeek: 2,
    titleTemplate: (t) => `광고: ${t}`,
    tone: '타겟팅·CTA', journeyStage: 'conversion',
  },
];

// ─── Customer Journey-Based Week Themes (Audit C4) ───

const WEEK_THEMES = [
  {
    label: 'Week 1: 인지 확대 & 브랜드 정비',
    pillarFocus: 0,  // 전문성·신뢰
    journeyFocus: 'awareness' as const,
    description: '신규 유입 극대화 — YouTube Shorts, TikTok, Instagram Reels 집중',
  },
  {
    label: 'Week 2: 관심 유도 & 교육 콘텐츠',
    pillarFocus: 1,  // 비포·애프터
    journeyFocus: 'interest' as const,
    description: '정보 탐색 — Long-form, 블로그 SEO, Carousel 집중',
  },
  {
    label: 'Week 3: 신뢰 구축 & 소셜 증거',
    pillarFocus: 2,  // 환자 후기
    journeyFocus: 'consideration' as const,
    description: '비교 검토 — 강남언니 리뷰, Before/After, 의사 소개 집중',
  },
  {
    label: 'Week 4: 전환 최적화 & CTA',
    pillarFocus: 3,  // 트렌드·교육
    journeyFocus: 'conversion' as const,
    description: '상담 예약 유도 — Facebook 광고, Instagram DM CTA, 프로모션',
  },
];

// ─── Topic Generation (with keyword injection — Audit C5) ───

interface TopicPool {
  topics: string[];
  cursor: number;
}

function buildTopicPool(
  pillars: ContentPillar[],
  services: string[],
  pillarIndex: number,
  keywords?: { keyword: string; monthlySearches?: number }[],
): TopicPool {
  const pillar = pillars[pillarIndex % pillars.length];
  const svcList = services.length > 0 ? services : ['시술'];

  const topics: string[] = [];

  // Inject high-volume keywords as topics (Audit C5)
  if (keywords?.length) {
    const topKeywords = keywords
      .sort((a, b) => (b.monthlySearches || 0) - (a.monthlySearches || 0))
      .slice(0, 5)
      .map(k => k.keyword);
    for (const kw of topKeywords) {
      topics.push(kw);
    }
  }

  // Pillar-specific templates
  switch (pillarIndex % 5) {
    case 0: // 전문성·신뢰
      for (const svc of svcList) {
        topics.push(`${svc} 전문의 Q&A`);
        topics.push(`${svc} 과정 완전정복`);
        topics.push(`${svc} 수술실 CCTV 공개`);
      }
      topics.push('의료진 학회 발표·해외 연수');
      topics.push('최신 장비 도입 소개');
      topics.push('마취 안전 관리 시스템');
      break;
    case 1: // 비포·애프터
      for (const svc of svcList) {
        topics.push(`${svc} 전후 비교`);
        topics.push(`${svc} Before/After 타임랩스`);
        topics.push(`${svc} 3D 시뮬레이션 미리보기`);
      }
      topics.push('자연스러운 라인 완성');
      topics.push('시간별 회복 과정 기록');
      break;
    case 2: // 환자 후기
      for (const svc of svcList) {
        topics.push(`${svc} 실제 환자 인터뷰`);
        topics.push(`${svc} 회복 일기`);
      }
      topics.push('해외 환자 케이스');
      topics.push('환자가 말하는: 왜 여기를 선택했나');
      topics.push('리뷰 하이라이트 모음');
      break;
    case 3: // 트렌드·교육
      for (const svc of svcList) {
        topics.push(`${svc} 비용 완벽 가이드`);
        topics.push(`${svc} FAQ 총정리`);
      }
      topics.push('2026 성형 트렌드: 자연주의');
      topics.push('성형 전 필수 체크리스트');
      topics.push('시술 비교: 이걸로 고민 끝');
      break;
    case 4: // 안전·케어 (5th Pillar — Audit H5)
      for (const svc of svcList) {
        topics.push(`${svc} 수술 후 관리 가이드`);
      }
      topics.push('24시간 집중 케어 시스템');
      topics.push('전담 간호사 1:1 관리');
      topics.push('리커버리 프로그램 소개');
      topics.push('응급 상황 대응 프로토콜');
      break;
  }

  // Add pillar example topics as fallback
  for (const t of pillar?.exampleTopics || []) {
    if (!topics.includes(t)) topics.push(t);
  }

  return { topics, cursor: 0 };
}

function nextTopic(pool: TopicPool): string {
  const topic = pool.topics[pool.cursor % pool.topics.length];
  pool.cursor++;
  return topic;
}

// ─── Repurpose Topics from YouTube Videos ───

function buildRepurposeTopics(
  videos: { title: string; views: number; type: 'Short' | 'Long' }[],
): string[] {
  return videos
    .sort((a, b) => b.views - a.views)
    .slice(0, 6)
    .map(v => v.title.replace(/[|｜\-–—].*$/, '').trim())
    .filter(t => t.length > 2);
}

// ─── 강남언니 Special Topics ───

function buildGangnamUnniTopics(
  services: string[],
  data?: { rating?: number; reviews?: number; doctors?: number },
): string[] {
  const topics: string[] = [];
  const svcList = services.length > 0 ? services : ['시술'];

  // Review management topics
  topics.push('신규 리뷰 감사 응대');
  topics.push('부정 리뷰 전문 응대');

  // Profile optimization
  for (const svc of svcList.slice(0, 3)) {
    topics.push(`${svc} 시술 정보 업데이트`);
  }
  topics.push('의사 프로필 사진·경력 갱신');
  topics.push('대표 시술 가격 재검토');

  // Data-driven topics
  if (data?.rating && data.rating < 9.0) {
    topics.push('평점 개선 액션 플랜');
  }
  if (data?.reviews && data.reviews < 500) {
    topics.push('리뷰 수 증가 캠페인');
  }

  // Events
  for (const svc of svcList.slice(0, 2)) {
    topics.push(`${svc} 시즌 이벤트`);
  }

  return topics;
}

// ─── Main Engine ───

export function generateContentPlan(input: ContentDirectorInput): ContentDirectorOutput {
  const { channels, pillars, services, youtubeVideos, clinicName, keywords, gangnamUnniData } = input;

  // 1. Determine active format slots based on available channels
  const activeSlots: FormatSlot[] = [];
  const channelIds = new Set(channels.map(c => c.channelId.toLowerCase()));

  if (channelIds.has('youtube')) activeSlots.push(...YOUTUBE_SLOTS);
  if (channelIds.has('instagram')) activeSlots.push(...INSTAGRAM_SLOTS);
  if (channelIds.has('gangnamunni') || channelIds.has('gangnamUnni')) activeSlots.push(...GANGNAMUNNI_SLOTS);
  if (channelIds.has('tiktok')) activeSlots.push(...TIKTOK_SLOTS);
  if (channelIds.has('naverblog') || channelIds.has('naver_blog')) activeSlots.push(...NAVER_SLOTS);
  if (channelIds.has('facebook')) activeSlots.push(...FACEBOOK_SLOTS);

  // Fallback: if no channels matched, use core 3 channels
  if (activeSlots.length === 0) {
    activeSlots.push(...YOUTUBE_SLOTS, ...INSTAGRAM_SLOTS, ...NAVER_SLOTS);
  }

  // 2. Build repurpose topics from existing YouTube videos
  const repurposeTopics = youtubeVideos ? buildRepurposeTopics(youtubeVideos) : [];

  // 3. Build 강남언니 special topic pool
  const guTopics = buildGangnamUnniTopics(services, gangnamUnniData);
  let guCursor = 0;

  // 4. Generate 4 weeks of content
  const weeks: CalendarWeek[] = [];

  for (let weekIdx = 0; weekIdx < 4; weekIdx++) {
    const theme = WEEK_THEMES[weekIdx];

    // Build topic pools focused on this week's pillar + 5th pillar rotation
    const primaryPool = buildTopicPool(pillars, services, theme.pillarFocus, keywords);
    const secondaryPool = buildTopicPool(pillars, services, (theme.pillarFocus + 1) % 5, keywords);
    // 5th pillar (안전·케어) injected every other week
    const carePool = weekIdx % 2 === 1
      ? buildTopicPool(pillars, services, 4, keywords)
      : null;

    const entries: CalendarEntry[] = [];

    // Week 1 special: brand setup tasks
    if (weekIdx === 0) {
      entries.push({
        dayOfWeek: 0,
        channel: clinicName,
        channelIcon: 'globe',
        contentType: 'social',
        title: '전 채널 프로필/브랜드 일관성 정비',
        description: '프로필 사진, 배너, 바이오를 모든 채널에서 통일',
        pillar: '전문성 · 신뢰',
        status: 'draft',
      });
    }

    // Fill format slots for this week
    for (const slot of activeSlots) {
      // Use care pool occasionally
      const pool = carePool && entries.length % 5 === 0
        ? carePool
        : entries.length % 2 === 0 ? primaryPool : secondaryPool;

      for (let i = 0; i < slot.perWeek; i++) {
        let topic: string;

        // 강남언니: use dedicated topic pool
        if (slot.channel === '강남언니') {
          topic = guTopics[guCursor % guTopics.length];
          guCursor++;
        }
        // Repurpose popular YouTube content for Shorts/TikTok in weeks 2-4
        else if (weekIdx >= 1 && repurposeTopics.length > 0 && i === 0 &&
          (slot.format === 'Shorts' || slot.format === '숏폼')) {
          const rIdx = (weekIdx - 1 + i) % repurposeTopics.length;
          topic = repurposeTopics[rIdx];
        } else {
          topic = nextTopic(pool);
        }

        const dayOfWeek = slot.preferredDays[i % slot.preferredDays.length];

        entries.push({
          dayOfWeek,
          channel: slot.channel,
          channelIcon: slot.channelIcon,
          contentType: slot.contentType,
          title: slot.titleTemplate(topic, i),
          pillar: pillars[theme.pillarFocus % pillars.length]?.title,
          status: 'draft',
        });
      }
    }

    // Week 3 special: 강남언니 리뷰 집중 (소셜 증거 강화)
    if (weekIdx === 2 && !channelIds.has('gangnamunni') && !channelIds.has('gangnamUnni')) {
      entries.push({
        dayOfWeek: 3,
        channel: '강남언니',
        channelIcon: 'star',
        contentType: 'social',
        title: '강남언니 프로필 개설/최적화',
        description: '아직 강남언니 계정이 없다면 개설, 있다면 프로필 최적화',
        pillar: '환자 후기 · 리뷰',
        status: 'draft',
      });
    }

    // Week 4 special: conversion-focused entries
    if (weekIdx === 3) {
      entries.push({
        dayOfWeek: 5,
        channel: 'Instagram',
        channelIcon: 'instagram',
        contentType: 'social',
        title: 'Stories: 상담 예약 CTA + 카카오톡 링크',
        description: 'DM→카카오톡→전화 전환 퍼널 활성화',
        pillar: '트렌드 · 교육',
        status: 'draft',
      });
      entries.push({
        dayOfWeek: 6,
        channel: 'Facebook',
        channelIcon: 'facebook',
        contentType: 'ad',
        title: '광고: 리타겟팅 — 웹사이트 방문자 재유입',
        description: '최근 30일 웹사이트 방문자 대상 리타겟팅 광고',
        pillar: '트렌드 · 교육',
        status: 'draft',
      });
    }

    // Sort entries by day of week
    entries.sort((a, b) => a.dayOfWeek - b.dayOfWeek);

    weeks.push({
      weekNumber: weekIdx + 1,
      label: theme.label,
      entries,
    });
  }

  // 5. Calculate monthly summary
  const allEntries = weeks.flatMap(w => w.entries);
  const monthlySummary: ContentCountSummary[] = [
    {
      type: 'video',
      label: '영상',
      count: allEntries.filter(e => e.contentType === 'video').length,
      color: '#6C5CE7',
    },
    {
      type: 'blog',
      label: '블로그',
      count: allEntries.filter(e => e.contentType === 'blog').length,
      color: '#00B894',
    },
    {
      type: 'social',
      label: '소셜',
      count: allEntries.filter(e => e.contentType === 'social').length,
      color: '#E17055',
    },
    {
      type: 'ad',
      label: '광고',
      count: allEntries.filter(e => e.contentType === 'ad').length,
      color: '#FDCB6E',
    },
  ];

  return { weeks, monthlySummary };
}