-- 论坛第三阶段增强：通知/收藏/举报/嵌套回复
-- 2026-06-04

-- AlterTable: forum_topics 加 is_hidden 字段
ALTER TABLE `forum_topics` ADD COLUMN `is_hidden` BOOLEAN NOT NULL DEFAULT false;
ALTER TABLE `forum_topics` ADD INDEX `forum_topics_is_hidden_idx`(`is_hidden`);

-- AlterTable: forum_posts 加 reply_to_id / reply_to_snapshot
ALTER TABLE `forum_posts` ADD COLUMN `reply_to_id` INTEGER NULL;
ALTER TABLE `forum_posts` ADD COLUMN `reply_to_snapshot` VARCHAR(300) NULL;
ALTER TABLE `forum_posts` ADD CONSTRAINT `forum_posts_reply_to_id_fkey` FOREIGN KEY (`reply_to_id`) REFERENCES `forum_posts`(`id`) ON DELETE SET NULL ON UPDATE CASCADE;
ALTER TABLE `forum_posts` ADD INDEX `forum_posts_reply_to_id_idx`(`reply_to_id`);

-- AlterTable: forum_topics 加联合全文索引
ALTER TABLE `forum_topics` ADD FULLTEXT INDEX `forum_topics_title_content_idx`(`title`, `content`);

-- CreateTable: 收藏
CREATE TABLE `forum_topic_bookmarks` (
    `id` INTEGER NOT NULL AUTO_INCREMENT,
    `topic_id` INTEGER NOT NULL,
    `user_id` INTEGER NOT NULL,
    `created_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    PRIMARY KEY (`id`),
    UNIQUE INDEX `forum_topic_bookmarks_topic_id_user_id_key`(`topic_id`, `user_id`),
    INDEX `forum_topic_bookmarks_user_id_created_at_idx`(`user_id`, `created_at`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

ALTER TABLE `forum_topic_bookmarks` ADD CONSTRAINT `forum_topic_bookmarks_topic_id_fkey` FOREIGN KEY (`topic_id`) REFERENCES `forum_topics`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE `forum_topic_bookmarks` ADD CONSTRAINT `forum_topic_bookmarks_user_id_fkey` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- CreateTable: 举报
CREATE TABLE `forum_reports` (
    `id` INTEGER NOT NULL AUTO_INCREMENT,
    `reporter_id` INTEGER NOT NULL,
    `topic_id` INTEGER NULL,
    `post_id` INTEGER NULL,
    `reason` VARCHAR(50) NOT NULL,
    `detail` VARCHAR(500) NULL,
    `status` VARCHAR(20) NOT NULL DEFAULT 'pending',
    `created_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    `resolved_at` DATETIME(3) NULL,
    PRIMARY KEY (`id`),
    INDEX `forum_reports_status_created_at_idx`(`status`, `created_at`),
    INDEX `forum_reports_reporter_id_idx`(`reporter_id`),
    INDEX `forum_reports_topic_id_idx`(`topic_id`),
    INDEX `forum_reports_post_id_idx`(`post_id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

ALTER TABLE `forum_reports` ADD CONSTRAINT `forum_reports_reporter_id_fkey` FOREIGN KEY (`reporter_id`) REFERENCES `users`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE `forum_reports` ADD CONSTRAINT `forum_reports_topic_id_fkey` FOREIGN KEY (`topic_id`) REFERENCES `forum_topics`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AlterTable: notifications 增加新枚举值
ALTER TABLE `notifications` MODIFY COLUMN `type` ENUM('COMMENT_REPLY','COMMENT_LIKE','TOPIC_REPLY','MENTION','BEST_ANSWER','POST_LIKE','TOPIC_LIKE','SYSTEM') NOT NULL;