-- Pair-shaped friend_relations (user_small, user_big) → two directed rows.
-- Skipped by cmd/migrate when friend_relations.user_id already exists.

CREATE TABLE IF NOT EXISTS friend_relations_new (
    id          BIGINT NOT NULL AUTO_INCREMENT COMMENT '行 id，表内自增',
    user_id     BIGINT NOT NULL COMMENT '关系所属用户',
    friend_id   BIGINT NOT NULL COMMENT '对方 user_id',
    status      TINYINT NOT NULL DEFAULT 1 COMMENT '1=好友 0=非好友（仅用于单向拉黑占位）',
    remark      VARCHAR(64) NOT NULL DEFAULT '' COMMENT '备注，仅自己可见',
    is_blocked  TINYINT NOT NULL DEFAULT 0 COMMENT '是否拉黑对方',
    is_pinned   TINYINT NOT NULL DEFAULT 0 COMMENT '会话消息置顶',
    source      TINYINT NOT NULL DEFAULT 0 COMMENT '添加来源：0=未知 1=二维码 2=邮箱 3=spark_id',
    created_at  DATETIME(3) NOT NULL COMMENT '成为好友或建边时间',
    updated_at  DATETIME(3) NOT NULL COMMENT '最近更新时间',
    PRIMARY KEY (id),
    UNIQUE KEY uk_user_friend (user_id, friend_id),
    KEY idx_user_status (user_id, status)
) COMMENT='单向好友边。A 与 B 互为好友时存两行，各自维护备注、拉黑、置顶';

INSERT IGNORE INTO friend_relations_new (user_id, friend_id, status, remark, is_blocked, is_pinned, source, created_at, updated_at)
SELECT r.user_small, r.user_big, 1, IFNULL(n.remark, ''), 0, 0, 0, r.created_at, r.created_at
FROM friend_relations r
LEFT JOIN friend_remarks n ON n.user_id = r.user_small AND n.friend_id = r.user_big;

INSERT IGNORE INTO friend_relations_new (user_id, friend_id, status, remark, is_blocked, is_pinned, source, created_at, updated_at)
SELECT r.user_big, r.user_small, 1, IFNULL(n.remark, ''), 0, 0, 0, r.created_at, r.created_at
FROM friend_relations r
LEFT JOIN friend_remarks n ON n.user_id = r.user_big AND n.friend_id = r.user_small;

INSERT INTO friend_relations_new (user_id, friend_id, status, remark, is_blocked, is_pinned, source, created_at, updated_at)
SELECT b.user_id, b.blocked_id, 0, '', 1, 0, 0, b.created_at, b.created_at
FROM user_blocks b
ON DUPLICATE KEY UPDATE is_blocked = 1, updated_at = VALUES(updated_at);

DROP TABLE IF EXISTS friend_remarks;
DROP TABLE IF EXISTS user_blocks;
DROP TABLE IF EXISTS friend_relations;
RENAME TABLE friend_relations_new TO friend_relations;