import { useState, useEffect } from 'react';
import { useLocation } from 'react-router';
import type { MarketingPlan, ChannelStrategyCard, CalendarData, ContentStrategyData } from '../types/plan';
import { fetchReportById, fetchActiveContentPlan, supabase } from '../lib/supabase';
import { transformReportToPlan } from '../lib/transformPlan';
import { mockPlan } from '../data/mockPlan';

interface UseMarketingPlanResult {
  data: MarketingPlan | null;
  isLoading: boolean;
  error: string | null;
}

interface LocationState {
  report?: Record<string, unknown>;
  metadata?: Record<string, unknown>;
  reportId?: string;
  clinicId?: string;
}

/**
 * Build a MarketingPlan from content_plans DB row.
 * content_plans stores AI-generated strategy in JSONB columns.
 */
function buildPlanFromContentPlans(
  row: Record<string, unknown>,
  clinicName: string,
  clinicNameEn: string,
  targetUrl: string,
): MarketingPlan {
  const channelStrategies = (row.channel_strategies || []) as ChannelStrategyCard[];
  const contentStrategy = (row.content_strategy || {}) as ContentStrategyData;
  const calendar = (row.calendar || { weeks: [], monthlySummary: [] }) as CalendarData;

  return {
    id: row.id as string,
    reportId: (row.run_id as string) || (row.id as string),
    clinicName,
    clinicNameEn,
    createdAt: (row.created_at as string) || new Date().toISOString(),
    targetUrl,
    brandGuide: (row.brand_guide as MarketingPlan['brandGuide']) || {
      colors: [],
      fonts: [],
      logoRules: [],
      toneOfVoice: {
        personality: ['전문적', '친근한', '신뢰할 수 있는'],
        communicationStyle: '의료 전문 지식을 쉽고 친근하게 전달',
        doExamples: [],
        dontExamples: [],
      },
      channelBranding: [],
      brandInconsistencies: [],
    },
    channelStrategies,
    contentStrategy: {
      pillars: contentStrategy.pillars || [],
      typeMatrix: contentStrategy.typeMatrix || [],
      workflow: contentStrategy.workflow || [
        { step: 1, name: '기획', description: 'AI 콘텐츠 주제 선정', owner: 'INFINITH AI', duration: '자동' },
        { step: 2, name: '제작', description: 'AI 초안 생성 + 의료진 감수', owner: 'INFINITH AI', duration: '1시간' },
        { step: 3, name: '편집', description: '영상/이미지 편집', owner: 'INFINITH Studio', duration: '30분' },
        { step: 4, name: '배포', description: '채널별 최적화 배포', owner: 'INFINITH Distribution', duration: '자동' },
        { step: 5, name: '분석', description: '성과 데이터 수집 + 전략 조정', owner: 'INFINITH Analytics', duration: '자동' },
      ],
      repurposingSource: contentStrategy.repurposingSource || '1개 롱폼 영상',
      repurposingOutputs: contentStrategy.repurposingOutputs || [],
    },
    calendar,
    assetCollection: { assets: [], youtubeRepurpose: [] },
  };
}

export function useMarketingPlan(id: string | undefined): UseMarketingPlanResult {
  const [data, setData] = useState<MarketingPlan | null>(null);
  const [isLoading, setIsLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const location = useLocation();

  useEffect(() => {
    if (!id) {
      setError('No plan ID provided');
      setIsLoading(false);
      return;
    }

    const state = location.state as LocationState | undefined;

    async function loadPlan() {
      try {
        // ─── Dev / Demo: return mock data immediately ───
        if (id === 'demo' || id === 'view-clinic') {
          setData(mockPlan);
          setIsLoading(false);
          return;
        }

        // ─── Source 1: Try content_plans table (AI-generated strategy) ───
        // First, resolve clinicId from navigation state or analysis_runs
        let clinicId = state?.clinicId || null;
        let clinicName = '';
        let clinicNameEn = '';
        let targetUrl = '';

        if (!clinicId) {
          // Try to find clinicId from analysis_runs by run/report ID
          const { data: run } = await supabase
            .from('analysis_runs')
            .select('clinic_id')
            .eq('id', id)
            .single();
          if (run) clinicId = run.clinic_id;
        }

        if (clinicId) {
          // Fetch clinic info for plan metadata
          const { data: clinic } = await supabase
            .from('clinics')
            .select('name, name_en, url')
            .eq('id', clinicId)
            .single();
          if (clinic) {
            clinicName = clinic.name || '';
            clinicNameEn = clinic.name_en || '';
            targetUrl = clinic.url || '';
          }

          // Try fetching active content plan
          const contentPlan = await fetchActiveContentPlan(clinicId);
          if (contentPlan) {
            const plan = buildPlanFromContentPlans(
              contentPlan,
              clinicName,
              clinicNameEn,
              targetUrl,
            );
            setData(plan);
            setIsLoading(false);
            return;
          }
        }

        // ─── Source 2: Report data from navigation state (fallback) ───
        if (state?.report && state?.metadata) {
          const plan = transformReportToPlan({
            id: (state.reportId || id),
            url: (state.metadata.url as string) || '',
            clinic_name: (state.metadata.clinicName as string) || '',
            report: state.report,
            created_at: (state.metadata.generatedAt as string) || new Date().toISOString(),
          });
          setData(plan);
          setIsLoading(false);
          return;
        }

        // ─── Source 3: Fetch report from Supabase and transform (fallback) ───
        const row = await fetchReportById(id);
        const plan = transformReportToPlan(row);
        setData(plan);
      } catch (err) {
        setError(err instanceof Error ? err.message : 'Failed to fetch marketing plan');
      } finally {
        setIsLoading(false);
      }
    }

    loadPlan();
  }, [id, location.state]);

  return { data, isLoading, error };
}