-- Script de vérification de l'état de la base de données
-- À exécuter AVANT la migration pour diagnostiquer l'état actuel

-- ========================================
-- VÉRIFICATION DES COLONNES
-- ========================================

-- Vérifier si les colonnes de liens courts existent
SELECT 
    'campaigns.slug' as column_name,
    CASE 
        WHEN EXISTS (
            SELECT 1 FROM information_schema.columns 
            WHERE table_name = 'campaigns' AND column_name = 'slug'
        ) THEN '✅ Existe'
        ELSE '❌ Manquante'
    END as status
UNION ALL
SELECT 
    'participants.short_id' as column_name,
    CASE 
        WHEN EXISTS (
            SELECT 1 FROM information_schema.columns 
            WHERE table_name = 'participants' AND column_name = 'short_id'
        ) THEN '✅ Existe'
        ELSE '❌ Manquante'
    END as status;

-- ========================================
-- VÉRIFICATION DES FONCTIONS
-- ========================================

-- Vérifier si les fonctions utilitaires existent
SELECT 
    'generate_slug' as function_name,
    CASE 
        WHEN EXISTS (
            SELECT 1 FROM pg_proc p 
            JOIN pg_namespace n ON p.pronamespace = n.oid 
            WHERE p.proname = 'generate_slug' AND n.nspname = 'public'
        ) THEN '✅ Existe'
        ELSE '❌ Manquante'
    END as status
UNION ALL
SELECT 
    'generate_short_id' as function_name,
    CASE 
        WHEN EXISTS (
            SELECT 1 FROM pg_proc p 
            JOIN pg_namespace n ON p.pronamespace = n.oid 
            WHERE p.proname = 'generate_short_id' AND n.nspname = 'public'
        ) THEN '✅ Existe'
        ELSE '❌ Manquante'
    END as status
UNION ALL
SELECT 
    'replace_participant_votes' as function_name,
    CASE 
        WHEN EXISTS (
            SELECT 1 FROM pg_proc p 
            JOIN pg_namespace n ON p.pronamespace = n.oid 
            WHERE p.proname = 'replace_participant_votes' AND n.nspname = 'public'
        ) THEN '✅ Existe'
        ELSE '❌ Manquante'
    END as status;

-- ========================================
-- VÉRIFICATION DES INDEX
-- ========================================

-- Vérifier si les index de performance existent
SELECT 
    'idx_campaigns_slug' as index_name,
    CASE 
        WHEN EXISTS (
            SELECT 1 FROM pg_indexes 
            WHERE indexname = 'idx_campaigns_slug'
        ) THEN '✅ Existe'
        ELSE '❌ Manquant'
    END as status
UNION ALL
SELECT 
    'idx_participants_short_id' as index_name,
    CASE 
        WHEN EXISTS (
            SELECT 1 FROM pg_indexes 
            WHERE indexname = 'idx_participants_short_id'
        ) THEN '✅ Existe'
        ELSE '❌ Manquant'
    END as status;

-- ========================================
-- ANALYSE DES DONNÉES EXISTANTES
-- ========================================

-- Compter les campagnes et leur état (version sécurisée)
DO $$
DECLARE
    campaigns_total INTEGER;
    campaigns_with_slug INTEGER := 0;
    participants_total INTEGER;
    participants_with_short_id INTEGER := 0;
    slug_exists BOOLEAN;
    short_id_exists BOOLEAN;
BEGIN
    -- Vérifier si les colonnes existent
    SELECT EXISTS (
        SELECT 1 FROM information_schema.columns 
        WHERE table_name = 'campaigns' AND column_name = 'slug'
    ) INTO slug_exists;
    
    SELECT EXISTS (
        SELECT 1 FROM information_schema.columns 
        WHERE table_name = 'participants' AND column_name = 'short_id'
    ) INTO short_id_exists;
    
    -- Compter les campagnes
    SELECT COUNT(*) INTO campaigns_total FROM campaigns;
    
    -- Compter les participants
    SELECT COUNT(*) INTO participants_total FROM participants;
    
    -- Compter les campagnes avec slug si la colonne existe
    IF slug_exists THEN
        SELECT COUNT(*) INTO campaigns_with_slug FROM campaigns WHERE slug IS NOT NULL;
    END IF;
    
    -- Compter les participants avec short_id si la colonne existe
    IF short_id_exists THEN
        SELECT COUNT(*) INTO participants_with_short_id FROM participants WHERE short_id IS NOT NULL;
    END IF;
    
    -- Afficher les résultats
    RAISE NOTICE '=== ANALYSE DES DONNÉES ===';
    RAISE NOTICE 'Campagnes totales: %', campaigns_total;
    IF slug_exists THEN
        RAISE NOTICE 'Campagnes avec slug: %', campaigns_with_slug;
        RAISE NOTICE 'Campagnes sans slug: %', campaigns_total - campaigns_with_slug;
    ELSE
        RAISE NOTICE 'Colonne slug: ❌ N''existe pas encore';
    END IF;
    
    RAISE NOTICE 'Participants totaux: %', participants_total;
    IF short_id_exists THEN
        RAISE NOTICE 'Participants avec short_id: %', participants_with_short_id;
        RAISE NOTICE 'Participants sans short_id: %', participants_total - participants_with_short_id;
    ELSE
        RAISE NOTICE 'Colonne short_id: ❌ N''existe pas encore';
    END IF;
END $$;

-- ========================================
-- EXEMPLES DE DONNÉES EXISTANTES
-- ========================================

-- Afficher quelques exemples de campagnes (version sécurisée)
DO $$
DECLARE
    slug_exists BOOLEAN;
    r RECORD;
BEGIN
    -- Vérifier si la colonne slug existe
    SELECT EXISTS (
        SELECT 1 FROM information_schema.columns 
        WHERE table_name = 'campaigns' AND column_name = 'slug'
    ) INTO slug_exists;
    
    IF slug_exists THEN
        RAISE NOTICE '=== EXEMPLES DE CAMPAGNES ===';
        FOR r IN 
            SELECT 
                id,
                title,
                slug,
                CASE 
                    WHEN slug IS NULL THEN '❌ Besoin de migration'
                    ELSE '✅ OK'
                END as status
            FROM campaigns 
            ORDER BY created_at DESC 
            LIMIT 5
        LOOP
            RAISE NOTICE 'ID: %, Titre: %, Slug: %, Status: %', r.id, r.title, r.slug, r.status;
        END LOOP;
    ELSE
        RAISE NOTICE '=== EXEMPLES DE CAMPAGNES ===';
        FOR r IN 
            SELECT 
                id,
                title
            FROM campaigns 
            ORDER BY created_at DESC 
            LIMIT 5
        LOOP
            RAISE NOTICE 'ID: %, Titre: %, Slug: ❌ Colonne inexistante', r.id, r.title;
        END LOOP;
    END IF;
END $$;

-- Afficher quelques exemples de participants (version sécurisée)
DO $$
DECLARE
    short_id_exists BOOLEAN;
    r RECORD;
BEGIN
    -- Vérifier si la colonne short_id existe
    SELECT EXISTS (
        SELECT 1 FROM information_schema.columns 
        WHERE table_name = 'participants' AND column_name = 'short_id'
    ) INTO short_id_exists;
    
    IF short_id_exists THEN
        RAISE NOTICE '=== EXEMPLES DE PARTICIPANTS ===';
        FOR r IN 
            SELECT 
                id,
                first_name,
                last_name,
                short_id,
                CASE 
                    WHEN short_id IS NULL THEN '❌ Besoin de migration'
                    ELSE '✅ OK'
                END as status
            FROM participants 
            ORDER BY created_at DESC 
            LIMIT 5
        LOOP
            RAISE NOTICE 'ID: %, Nom: % %, Short ID: %, Status: %', r.id, r.first_name, r.last_name, r.short_id, r.status;
        END LOOP;
    ELSE
        RAISE NOTICE '=== EXEMPLES DE PARTICIPANTS ===';
        FOR r IN 
            SELECT 
                id,
                first_name,
                last_name
            FROM participants 
            ORDER BY created_at DESC 
            LIMIT 5
        LOOP
            RAISE NOTICE 'ID: %, Nom: % %, Short ID: ❌ Colonne inexistante', r.id, r.first_name, r.last_name;
        END LOOP;
    END IF;
END $$;

-- ========================================
-- RECOMMANDATIONS
-- ========================================

DO $$
DECLARE
    missing_slug_count INTEGER := 0;
    missing_short_id_count INTEGER := 0;
    missing_functions INTEGER;
    missing_indexes INTEGER;
    slug_exists BOOLEAN;
    short_id_exists BOOLEAN;
BEGIN
    -- Vérifier si les colonnes existent
    SELECT EXISTS (
        SELECT 1 FROM information_schema.columns 
        WHERE table_name = 'campaigns' AND column_name = 'slug'
    ) INTO slug_exists;
    
    SELECT EXISTS (
        SELECT 1 FROM information_schema.columns 
        WHERE table_name = 'participants' AND column_name = 'short_id'
    ) INTO short_id_exists;
    
    -- Compter les éléments manquants seulement si les colonnes existent
    IF slug_exists THEN
        SELECT COUNT(*) INTO missing_slug_count FROM campaigns WHERE slug IS NULL;
    ELSE
        SELECT COUNT(*) INTO missing_slug_count FROM campaigns;
    END IF;
    
    IF short_id_exists THEN
        SELECT COUNT(*) INTO missing_short_id_count FROM participants WHERE short_id IS NULL;
    ELSE
        SELECT COUNT(*) INTO missing_short_id_count FROM participants;
    END IF;
    
    SELECT COUNT(*) INTO missing_functions 
    FROM (
        SELECT 'generate_slug' as func UNION ALL SELECT 'generate_short_id' UNION ALL SELECT 'replace_participant_votes'
    ) f
    WHERE NOT EXISTS (
        SELECT 1 FROM pg_proc p 
        JOIN pg_namespace n ON p.pronamespace = n.oid 
        WHERE p.proname = f.func AND n.nspname = 'public'
    );
    
    SELECT COUNT(*) INTO missing_indexes 
    FROM (
        SELECT 'idx_campaigns_slug' as idx UNION ALL SELECT 'idx_participants_short_id'
    ) i
    WHERE NOT EXISTS (
        SELECT 1 FROM pg_indexes WHERE indexname = i.idx
    );
    
    RAISE NOTICE '=== RECOMMANDATIONS ===';
    
    IF missing_slug_count > 0 OR missing_short_id_count > 0 OR missing_functions > 0 OR missing_indexes > 0 THEN
        RAISE NOTICE '🔄 Migration nécessaire !';
        IF missing_slug_count > 0 THEN
            IF slug_exists THEN
                RAISE NOTICE '   - % campagnes ont besoin d''un slug', missing_slug_count;
            ELSE
                RAISE NOTICE '   - % campagnes ont besoin de la colonne slug + génération', missing_slug_count;
            END IF;
        END IF;
        IF missing_short_id_count > 0 THEN
            IF short_id_exists THEN
                RAISE NOTICE '   - % participants ont besoin d''un short_id', missing_short_id_count;
            ELSE
                RAISE NOTICE '   - % participants ont besoin de la colonne short_id + génération', missing_short_id_count;
            END IF;
        END IF;
        IF missing_functions > 0 THEN
            RAISE NOTICE '   - % fonctions utilitaires manquantes', missing_functions;
        END IF;
        IF missing_indexes > 0 THEN
            RAISE NOTICE '   - % index de performance manquants', missing_indexes;
        END IF;
        RAISE NOTICE '   → Exécutez le script migration-to-latest-schema.sql';
    ELSE
        RAISE NOTICE '✅ Base de données à jour ! Aucune migration nécessaire.';
    END IF;
END $$;