-- Replace user_saved_filters with global bookmark system.
-- Hard cut: existing saved filters are removed and not migrated.
-- Hard cut: bookmark-level icons are removed; icons live on groups only.
-- Idempotent: safe to run multiple times.

DROP TABLE IF EXISTS `user_saved_filters`;

CREATE TABLE IF NOT EXISTS `user_bookmark_groups` (
  `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `user_id` INT UNSIGNED NOT NULL,
  `name` VARCHAR(100) NOT NULL,
  `icon` VARCHAR(40) NOT NULL DEFAULT 'bi-folder',
  `sort_order` SMALLINT UNSIGNED NOT NULL DEFAULT 0,
  `created` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `modified` DATETIME NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_ubg_user_sort` (`user_id`, `sort_order`),
  CONSTRAINT `fk_ubg_user` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `user_bookmarks` (
  `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `user_id` INT UNSIGNED NOT NULL,
  `group_id` INT UNSIGNED NULL,
  `name` VARCHAR(120) NOT NULL,
  `url` VARCHAR(500) NOT NULL,
  `sort_order` SMALLINT UNSIGNED NOT NULL DEFAULT 0,
  `created` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `modified` DATETIME NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `uniq_ub_user_url` (`user_id`, `url`),
  KEY `idx_ub_user_sort` (`user_id`, `sort_order`),
  KEY `idx_ub_group` (`group_id`),
  CONSTRAINT `fk_ub_user` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE,
  CONSTRAINT `fk_ub_group` FOREIGN KEY (`group_id`) REFERENCES `user_bookmark_groups` (`id`) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

SET @ubg_icon_exists = (
  SELECT COUNT(*)
  FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'user_bookmark_groups'
    AND COLUMN_NAME = 'icon'
);
SET @sql = IF(@ubg_icon_exists = 0,
  'ALTER TABLE `user_bookmark_groups` ADD COLUMN `icon` VARCHAR(40) NOT NULL DEFAULT ''bi-folder'' AFTER `name`',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

UPDATE `user_bookmark_groups`
SET `icon` = 'bi-folder'
WHERE `icon` IS NULL OR TRIM(`icon`) = '';

SET @ub_icon_exists = (
  SELECT COUNT(*)
  FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'user_bookmarks'
    AND COLUMN_NAME = 'icon'
);
SET @sql = IF(@ub_icon_exists > 0,
  'ALTER TABLE `user_bookmarks` DROP COLUMN `icon`',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

-- Keep the newest row for exact duplicate user+url pairs before adding unique key.
DELETE ub1
FROM user_bookmarks ub1
JOIN user_bookmarks ub2
  ON ub1.user_id = ub2.user_id
  AND ub1.url = ub2.url
  AND ub1.id < ub2.id;

SET @idx_exists = (
  SELECT COUNT(*)
  FROM information_schema.STATISTICS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'user_bookmarks'
    AND INDEX_NAME = 'uniq_ub_user_url'
);
SET @sql = IF(@idx_exists = 0,
  'ALTER TABLE `user_bookmarks` ADD UNIQUE KEY `uniq_ub_user_url` (`user_id`, `url`)',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @idx_group_sort_exists = (
  SELECT COUNT(*)
  FROM information_schema.STATISTICS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'user_bookmarks'
    AND INDEX_NAME = 'idx_ub_user_group_sort'
);
SET @sql = IF(@idx_group_sort_exists = 0,
  'ALTER TABLE `user_bookmarks` ADD KEY `idx_ub_user_group_sort` (`user_id`, `group_id`, `sort_order`)',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;