// Command migrate_refresh 一次性建表脚本（与 scripts/sql/*.sql 同源，手写 DDL 以保持与项目"SQL 托管表结构"约定一致）。
//
// 运行：go run ./scripts/migrate_refresh
// 可用环境变量 DB_DSN 覆盖连接串（默认 root:root@127.0.0.1:3306/db_dev）。
package main

import (
	"log"
	"os"

	"gorm.io/driver/mysql"
	"gorm.io/gorm"
)

func main() {
	dsn := os.Getenv("DB_DSN")
	if dsn == "" {
		dsn = "root:root@tcp(127.0.0.1:3306)/db_dev?charset=utf8mb4&parseTime=True&loc=Local"
	}
	db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
	if err != nil {
		log.Fatalf("open db: %v", err)
	}
	stmt := `CREATE TABLE IF NOT EXISTS refresh_tokens (
		id          BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
		user_id     INT UNSIGNED NOT NULL,
		token_hash  VARCHAR(64)  NOT NULL,
		expires_at  INT UNSIGNED NOT NULL DEFAULT 0,
		revoked     TINYINT UNSIGNED NOT NULL DEFAULT 0,
		user_agent  VARCHAR(255) NOT NULL DEFAULT '',
		ip          VARCHAR(64)  NOT NULL DEFAULT '',
		created_at  INT UNSIGNED NOT NULL DEFAULT 0,
		PRIMARY KEY (id),
		UNIQUE KEY uk_token_hash (token_hash),
		KEY idx_user_id (user_id)
	) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;`
	if err := db.Exec(stmt).Error; err != nil {
		log.Fatalf("create refresh_tokens: %v", err)
	}
	log.Println("✓ refresh_tokens ready")

	stmtFav := `CREATE TABLE IF NOT EXISTS favorites (
		id           INT UNSIGNED NOT NULL AUTO_INCREMENT,
		created_at   INT UNSIGNED NOT NULL DEFAULT 0,
		user_id      INT UNSIGNED NOT NULL,
		target_type  VARCHAR(16) NOT NULL DEFAULT '',
		target_uid   VARCHAR(64) NOT NULL DEFAULT '',
		title        VARCHAR(255) NOT NULL DEFAULT '',
		cover        VARCHAR(512) NOT NULL DEFAULT '',
		brand        VARCHAR(255) NOT NULL DEFAULT '',
		PRIMARY KEY (id),
		UNIQUE KEY uniq_user_target (user_id, target_uid),
		KEY idx_user (user_id),
		KEY idx_user_created (user_id, created_at)
	) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;`
	if err := db.Exec(stmtFav).Error; err != nil {
		log.Fatalf("create favorites: %v", err)
	}
	// 复合索引（user_id, created_at）：优化收藏分页深翻页（10万收藏场景）；已存在则忽略报错
	if err := db.Exec("ALTER TABLE favorites ADD INDEX idx_user_created (user_id, created_at)").Error; err != nil {
		log.Printf("ℹ favorites idx_user_created 已存在，可忽略: %v", err)
	}
	log.Println("✓ favorites ready")

	// histories：文章级浏览历史（2026-09-02 收敛）。
	// 仅存 user_id + target_uid（带 r=/s= 前缀的对外编码串，前缀即类型）+ viewed_at；
	// kind/target_type/title/cover/brand 快照已弃用（账户页展示时回查公开详情接口）。
	stmtHist := `CREATE TABLE IF NOT EXISTS histories (
		id           INT UNSIGNED NOT NULL AUTO_INCREMENT,
		viewed_at    INT UNSIGNED NOT NULL DEFAULT 0,
		user_id      INT UNSIGNED NOT NULL,
		target_uid   VARCHAR(64) NOT NULL DEFAULT '',
		PRIMARY KEY (id),
		UNIQUE KEY uniq_user_target (user_id, target_uid),
		KEY idx_user_viewed (user_id, viewed_at)
	) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;`
	if err := db.Exec(stmtHist).Error; err != nil {
		log.Fatalf("create histories: %v", err)
	}
	// —— 存量库收敛（幂等）：清掉旧固定串行（runway-looks/street-snaps），卸掉旧列与旧唯一键，换上新的 ——
	// 旧结构列/键可能不存在（新库）或已收敛（二次执行），每条失败仅提示、不中断。
	trimHist := []string{
		"DELETE FROM histories WHERE target_uid NOT LIKE 'r=%' AND target_uid NOT LIKE 's=%'",
		"ALTER TABLE histories DROP KEY uniq_user_kind_target",
		"ALTER TABLE histories DROP COLUMN kind",
		"ALTER TABLE histories DROP COLUMN target_type",
		"ALTER TABLE histories DROP COLUMN title",
		"ALTER TABLE histories DROP COLUMN cover",
		"ALTER TABLE histories DROP COLUMN brand",
		"ALTER TABLE histories ADD UNIQUE KEY uniq_user_target (user_id, target_uid)",
	}
	for _, stmt := range trimHist {
		if err := db.Exec(stmt).Error; err != nil {
			log.Printf("ℹ histories 收敛步骤可忽略（可能已收敛/新库）: %v", err)
		}
	}
	log.Println("✓ histories ready (article-level: user_id+target_uid+viewed_at)")
}