-- ============================================================
-- 05_media.sql
-- 素材库：媒体资源、标签
-- 对应 proposal.md 第 6 节
-- ============================================================

-- -----------------------------------------------------------
-- 6.2 素材库
-- -----------------------------------------------------------
CREATE TABLE IF NOT EXISTS `www_media` (
  `id`              BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `filename`        VARCHAR(255)  NOT NULL COMMENT '原始文件名',
  `file_path`       VARCHAR(500)  NOT NULL COMMENT '存储路径（相对 uploads/）',
  `file_type`       VARCHAR(10)   NOT NULL COMMENT '类型: image / video / file',
  `mime_type`       VARCHAR(50)   NOT NULL DEFAULT '' COMMENT 'MIME 类型',
  `file_size`       BIGINT UNSIGNED NOT NULL DEFAULT 0 COMMENT '文件大小（字节）',
  `width`           INT           DEFAULT NULL COMMENT '图片/视频宽度（px）',
  `height`          INT           DEFAULT NULL COMMENT '图片/视频高度（px）',
  `category`        VARCHAR(20)   NOT NULL DEFAULT 'other' COMMENT '分类: product / banner / news / brand / video / document / other',
  `thumbnail_url`   VARCHAR(500)  NOT NULL DEFAULT '' COMMENT '缩略图路径（300px 宽）',
  `webp_url`        VARCHAR(500)  NOT NULL DEFAULT '' COMMENT 'WebP 版本路径（图片自动生成）',
  `ref_count`       INT           NOT NULL DEFAULT 0 COMMENT '引用计数',
  `created_at`      DATETIME      NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `deleted_at`      DATETIME      DEFAULT NULL COMMENT '软删除时间',
  PRIMARY KEY (`id`),
  KEY `idx_category` (`category`),
  KEY `idx_filename` (`filename`),
  KEY `idx_created` (`created_at`),
  KEY `idx_deleted` (`deleted_at`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
  COMMENT='素材库';

-- -----------------------------------------------------------
-- 素材标签
-- -----------------------------------------------------------
CREATE TABLE IF NOT EXISTS `www_media_tags` (
  `id`              BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `tag_name`        VARCHAR(50)   NOT NULL COMMENT '标签名',
  PRIMARY KEY (`id`),
  UNIQUE KEY `uk_tag_name` (`tag_name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
  COMMENT='素材标签';

-- -----------------------------------------------------------
-- 素材-标签多对多关联
-- -----------------------------------------------------------
CREATE TABLE IF NOT EXISTS `www_media_tag_map` (
  `media_id`        BIGINT UNSIGNED NOT NULL,
  `tag_id`          BIGINT UNSIGNED NOT NULL,
  PRIMARY KEY (`media_id`, `tag_id`),
  KEY `idx_tag` (`tag_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
  COMMENT='素材-标签关联';