<?php

require_once __DIR__ . '/config.php';

function scitemcustom_column_exists(PDO $db, string $table, string $column): bool
{
    $stmt = $db->query("SHOW COLUMNS FROM `{$table}` LIKE " . $db->quote($column));

    return (bool) $stmt->fetch();
}

function scitemcustom_column_definition(PDO $db, string $table, string $column): ?array
{
    $stmt = $db->query("SHOW COLUMNS FROM `{$table}` LIKE " . $db->quote($column));
    $column_definition = $stmt->fetch(PDO::FETCH_ASSOC);

    return $column_definition ?: null;
}

function scitemcustom_index_exists(PDO $db, string $table, string $index): bool
{
    $stmt = $db->query("SHOW INDEX FROM `{$table}` WHERE Key_name = " . $db->quote($index));

    return (bool) $stmt->fetch();
}

function scitemcustom_foreign_key_exists(PDO $db, string $table, string $constraint): bool
{
    $stmt = $db->prepare(
        "SELECT COUNT(*)
         FROM information_schema.TABLE_CONSTRAINTS
         WHERE TABLE_SCHEMA = DATABASE()
           AND TABLE_NAME = :table_name
           AND CONSTRAINT_NAME = :constraint_name
           AND CONSTRAINT_TYPE = 'FOREIGN KEY'"
    );
    $stmt->execute([
        'table_name' => $table,
        'constraint_name' => $constraint,
    ]);

    return (int) $stmt->fetchColumn() > 0;
}

function scitemcustom_bootstrap(): void
{
    static $scitemcustom_bootstrap_done = false;

    if ($scitemcustom_bootstrap_done) {
        return;
    }

    $db = db();

    $db->exec(
        "CREATE TABLE IF NOT EXISTS tbl_scitemcustom (
            cl_scitemcustom_id INT(11) NOT NULL AUTO_INCREMENT,
            cl_scitemcustom_owner_auth_id INT UNSIGNED NOT NULL,
            cl_scitemcustom_obj_id INT(10) UNSIGNED NOT NULL,
            cl_scitemcustom_created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
            PRIMARY KEY (cl_scitemcustom_id),
            UNIQUE KEY uq_scitemcustom_owner_obj (cl_scitemcustom_owner_auth_id, cl_scitemcustom_obj_id),
            KEY idx_scitemcustom_owner (cl_scitemcustom_owner_auth_id),
            KEY idx_scitemcustom_obj (cl_scitemcustom_obj_id),
            CONSTRAINT fk_scitemcustom_owner_auth FOREIGN KEY (cl_scitemcustom_owner_auth_id)
                REFERENCES tbl_auth (cl_auth_id)
                ON DELETE CASCADE
                ON UPDATE CASCADE,
            CONSTRAINT fk_scitemcustom_obj FOREIGN KEY (cl_scitemcustom_obj_id)
                REFERENCES tbl_scobjs (cl_scobjs_id)
                ON DELETE CASCADE
                ON UPDATE CASCADE
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci"
    );

    if (!scitemcustom_column_exists($db, 'tbl_scitemcustom', 'cl_scitemcustom_owner_auth_id')) {
        $db->exec(
            'ALTER TABLE tbl_scitemcustom
             ADD COLUMN cl_scitemcustom_owner_auth_id INT UNSIGNED NULL AFTER cl_scitemcustom_id'
        );
    }

    if (scitemcustom_index_exists($db, 'tbl_scitemcustom', 'uq_scitemcustom_obj')) {
        $db->exec('ALTER TABLE tbl_scitemcustom DROP INDEX uq_scitemcustom_obj');
    }

    if (!scitemcustom_index_exists($db, 'tbl_scitemcustom', 'idx_scitemcustom_owner')) {
        $db->exec(
            'ALTER TABLE tbl_scitemcustom
             ADD INDEX idx_scitemcustom_owner (cl_scitemcustom_owner_auth_id)'
        );
    }

    if (!scitemcustom_index_exists($db, 'tbl_scitemcustom', 'uq_scitemcustom_owner_obj')) {
        $db->exec(
            'ALTER TABLE tbl_scitemcustom
             ADD UNIQUE KEY uq_scitemcustom_owner_obj (cl_scitemcustom_owner_auth_id, cl_scitemcustom_obj_id)'
        );
    }

    if (!scitemcustom_foreign_key_exists($db, 'tbl_scitemcustom', 'fk_scitemcustom_owner_auth')) {
        $db->exec(
            'ALTER TABLE tbl_scitemcustom
             ADD CONSTRAINT fk_scitemcustom_owner_auth FOREIGN KEY (cl_scitemcustom_owner_auth_id)
                 REFERENCES tbl_auth (cl_auth_id)
                 ON DELETE CASCADE
                 ON UPDATE CASCADE'
        );
    }

    $db->exec(
        "CREATE TABLE IF NOT EXISTS tbl_scitemcustomstat (
            cl_scitemcustomstat_id INT(11) NOT NULL AUTO_INCREMENT,
            cl_scitemcustomstat_itemcustom_id INT(11) NOT NULL,
            cl_scitemcustomstat_stat_id INT(11) NOT NULL,
            cl_scitemcustomstat_sign ENUM('+', '', '-') NOT NULL DEFAULT '+',
            cl_scitemcustomstat_value DECIMAL(10,2) NOT NULL DEFAULT 0.00,
            cl_scitemcustomstat_created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
            PRIMARY KEY (cl_scitemcustomstat_id),
            UNIQUE KEY uq_scitemcustomstat_item_stat (cl_scitemcustomstat_itemcustom_id, cl_scitemcustomstat_stat_id),
            KEY idx_scitemcustomstat_item (cl_scitemcustomstat_itemcustom_id),
            KEY idx_scitemcustomstat_stat (cl_scitemcustomstat_stat_id),
            CONSTRAINT fk_scitemcustomstat_item FOREIGN KEY (cl_scitemcustomstat_itemcustom_id)
                REFERENCES tbl_scitemcustom (cl_scitemcustom_id)
                ON DELETE CASCADE
                ON UPDATE CASCADE,
            CONSTRAINT fk_scitemcustomstat_stat FOREIGN KEY (cl_scitemcustomstat_stat_id)
                REFERENCES tbl_scstatsitem (cl_scstatsitem_id)
                ON DELETE CASCADE
                ON UPDATE CASCADE
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci"
    );

    $sign_column = scitemcustom_column_definition($db, 'tbl_scitemcustomstat', 'cl_scitemcustomstat_sign');
    if ($sign_column && ($sign_column['Type'] ?? '') !== "enum('+','','-')") {
        $db->exec(
            "ALTER TABLE tbl_scitemcustomstat
             MODIFY COLUMN cl_scitemcustomstat_sign ENUM('+', '', '-') NOT NULL DEFAULT '+'"
        );
    }

    $scitemcustom_bootstrap_done = true;
}