<?php
// app/Database/Migrations/2025-09-10-031050_CreateFamilyGuardians.php
namespace App\Database\Migrations;

use CodeIgniter\Database\Migration;

class CreateFamilyGuardians extends Migration
{
    protected $DBGroup = 'default';

    public function up()
    {
        $dbName = $this->db->getDatabase();

        // Find exact table names (handles Users/Families casing)
        $usersRow = $this->db->query(
            "SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES
             WHERE TABLE_SCHEMA = ? AND LOWER(TABLE_NAME) = 'users' LIMIT 1",
            [$dbName]
        )->getFirstRow();
        $familiesRow = $this->db->query(
            "SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES
             WHERE TABLE_SCHEMA = ? AND LOWER(TABLE_NAME) = 'families' LIMIT 1",
            [$dbName]
        )->getFirstRow();

        if (!$usersRow || !$familiesRow) {
            throw new \RuntimeException("Required tables not found: users or families in {$dbName}.");
        }
        $usersTable    = $usersRow->TABLE_NAME;
        $familiesTable = $familiesRow->TABLE_NAME;

        // Make sure parents are InnoDB (required for FKs)
        foreach ([$usersTable, $familiesTable] as $t) {
            $eng = $this->db->query(
                "SELECT ENGINE FROM INFORMATION_SCHEMA.TABLES
                 WHERE TABLE_SCHEMA=? AND TABLE_NAME=?",
                [$dbName, $t]
            )->getFirstRow();
            if (!$eng || strcasecmp($eng->ENGINE ?? '', 'InnoDB') !== 0) {
                $this->db->query("ALTER TABLE `{$t}` ENGINE=InnoDB");
            }
        }

        // Match child column types to parent id types exactly
        $usersIdType = $this->db->query(
            "SELECT COLUMN_TYPE FROM INFORMATION_SCHEMA.COLUMNS
             WHERE TABLE_SCHEMA=? AND TABLE_NAME=? AND COLUMN_NAME='id' LIMIT 1",
            [$dbName, $usersTable]
        )->getFirstRow()->COLUMN_TYPE ?? null;

        $familiesIdType = $this->db->query(
            "SELECT COLUMN_TYPE FROM INFORMATION_SCHEMA.COLUMNS
             WHERE TABLE_SCHEMA=? AND TABLE_NAME=? AND COLUMN_NAME='id' LIMIT 1",
            [$dbName, $familiesTable]
        )->getFirstRow()->COLUMN_TYPE ?? null;

        if (!$usersIdType || !$familiesIdType) {
            throw new \RuntimeException("Could not read id types from {$usersTable} / {$familiesTable}.");
        }

        // Clean slate in case a broken table exists
        $this->db->query("DROP TABLE IF EXISTS `family_guardians`");

        // Create with perfectly matching FK column types
        $sql = "
            CREATE TABLE `family_guardians` (
              `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
              `family_id` {$familiesIdType} NOT NULL,
              `user_id`   {$usersIdType}    NOT NULL,
              `relation` VARCHAR(32) DEFAULT NULL,
              `is_primary` TINYINT(1) DEFAULT 0,
              `receive_emails` TINYINT(1) DEFAULT 1,
              `receive_sms` TINYINT(1) DEFAULT 0,
              `custody_notes` VARCHAR(255) DEFAULT NULL,
              PRIMARY KEY (`id`),
              UNIQUE KEY `uq_family_user` (`family_id`,`user_id`),
              KEY `idx_fg_family` (`family_id`),
              KEY `idx_fg_user`   (`user_id`),
              CONSTRAINT `fk_fg_family`
                FOREIGN KEY (`family_id`) REFERENCES `{$familiesTable}` (`id`)
                ON DELETE CASCADE ON UPDATE CASCADE,
              CONSTRAINT `fk_fg_user`
                FOREIGN KEY (`user_id`)   REFERENCES `{$usersTable}` (`id`)
                ON DELETE CASCADE ON UPDATE CASCADE
            ) ENGINE=InnoDB
              DEFAULT CHARSET=utf8mb4
              COLLATE=utf8mb4_unicode_ci;
        ";
        $this->db->query($sql);
    }

    public function down()
    {
        $this->db->query("DROP TABLE IF EXISTS `family_guardians`");
    }
}