-- ================================================================================
-- Script de migration SÉCURISÉ : Correction des contraintes FK pour isolation par opération
-- ================================================================================
--
-- Ce script modifie les contraintes de clés étrangères pour que :
-- - ope_users_sectors.fk_user → pointe vers ope_users.id (au lieu de users.id)
-- - ope_pass.fk_user → pointe vers ope_users.id (au lieu de users.id)
--
-- Version SÉCURISÉE : Vérifie l'existence des contraintes avant de les supprimer
--
-- ================================================================================

USE dva_geo;

-- ================================================================================
-- Afficher les contraintes FK actuelles
-- ================================================================================

SELECT
    TABLE_NAME,
    COLUMN_NAME,
    CONSTRAINT_NAME,
    REFERENCED_TABLE_NAME,
    REFERENCED_COLUMN_NAME
FROM information_schema.KEY_COLUMN_USAGE
WHERE TABLE_SCHEMA = 'dva_geo'
AND TABLE_NAME IN ('ope_users_sectors', 'ope_pass')
AND COLUMN_NAME = 'fk_user'
ORDER BY TABLE_NAME;

-- ================================================================================
-- 1. Modification de ope_users_sectors.fk_user
-- ================================================================================

-- Supprimer l'ancienne contrainte FK si elle existe
SET @constraint_exists = (
    SELECT COUNT(*)
    FROM information_schema.KEY_COLUMN_USAGE
    WHERE TABLE_SCHEMA = 'dva_geo'
    AND TABLE_NAME = 'ope_users_sectors'
    AND COLUMN_NAME = 'fk_user'
    AND CONSTRAINT_NAME LIKE '%ibfk%'
);

SET @sql = IF(@constraint_exists > 0,
    CONCAT('ALTER TABLE ope_users_sectors DROP FOREIGN KEY ',
           (SELECT CONSTRAINT_NAME
            FROM information_schema.KEY_COLUMN_USAGE
            WHERE TABLE_SCHEMA = 'dva_geo'
            AND TABLE_NAME = 'ope_users_sectors'
            AND COLUMN_NAME = 'fk_user'
            AND CONSTRAINT_NAME LIKE '%ibfk%'
            LIMIT 1)),
    'SELECT "Aucune contrainte FK à supprimer sur ope_users_sectors" AS message'
);

PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

-- Recréer la contrainte FK vers ope_users.id
ALTER TABLE ope_users_sectors
ADD CONSTRAINT ope_users_sectors_ibfk_2
FOREIGN KEY (fk_user) REFERENCES ope_users (id) ON DELETE CASCADE ON UPDATE CASCADE;

-- ================================================================================
-- 2. Modification de ope_pass.fk_user
-- ================================================================================

-- Supprimer l'ancienne contrainte FK si elle existe
SET @constraint_exists = (
    SELECT COUNT(*)
    FROM information_schema.KEY_COLUMN_USAGE
    WHERE TABLE_SCHEMA = 'dva_geo'
    AND TABLE_NAME = 'ope_pass'
    AND COLUMN_NAME = 'fk_user'
    AND CONSTRAINT_NAME LIKE '%ibfk%'
);

SET @sql = IF(@constraint_exists > 0,
    CONCAT('ALTER TABLE ope_pass DROP FOREIGN KEY ',
           (SELECT CONSTRAINT_NAME
            FROM information_schema.KEY_COLUMN_USAGE
            WHERE TABLE_SCHEMA = 'dva_geo'
            AND TABLE_NAME = 'ope_pass'
            AND COLUMN_NAME = 'fk_user'
            AND CONSTRAINT_NAME LIKE '%ibfk%'
            LIMIT 1)),
    'SELECT "Aucune contrainte FK à supprimer sur ope_pass" AS message'
);

PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

-- Recréer la contrainte FK vers ope_users.id
ALTER TABLE ope_pass
ADD CONSTRAINT ope_pass_ibfk_3
FOREIGN KEY (fk_user) REFERENCES ope_users (id) ON DELETE CASCADE ON UPDATE CASCADE;

-- ================================================================================
-- Vérification finale
-- ================================================================================

SELECT
    TABLE_NAME,
    COLUMN_NAME,
    CONSTRAINT_NAME,
    REFERENCED_TABLE_NAME,
    REFERENCED_COLUMN_NAME
FROM information_schema.KEY_COLUMN_USAGE
WHERE TABLE_SCHEMA = 'dva_geo'
AND TABLE_NAME IN ('ope_users_sectors', 'ope_pass')
AND COLUMN_NAME = 'fk_user'
ORDER BY TABLE_NAME;

-- Résultat attendu :
-- ope_pass          | fk_user | ope_pass_ibfk_3           | ope_users | id
-- ope_users_sectors | fk_user | ope_users_sectors_ibfk_2  | ope_users | id

SELECT '✓ Contraintes FK modifiées avec succès !' AS status;