import type { Kysely } from "kysely";
import { dropTables, entityTable, execDdl, oneOf } from "../src/migration-helpers.ts";

// W2-B 字段级元数据协调(REQ §7.3):
// - metadata_field:各来源的候选字段值(来源/语言/时间/来源修订),刷新只写这里;
// - field_override:用户(或 Agent 生成并确认)的字段覆盖与锁定,优先于任何自动来源;
// 最终展示值投影到 media_entity.metadata / content_unit.metadata。路径绑定不受元数据刷新影响。

const SOURCE = ["tmdb", "user", "agent", "nfo", "site", "import"] as const;
const target = "constraint {t}_target_check check (num_nonnulls(media_entity_id, content_unit_id) = 1)";

// biome-ignore lint/suspicious/noExplicitAny: 迁移不依赖应用表类型
export async function up(db: Kysely<any>): Promise<void> {
  await execDdl(
    db,
    `
${entityTable(
  "metadata_field",
  `
  media_entity_id uuid references media_entity (id) on delete cascade,
  content_unit_id uuid references content_unit (id) on delete cascade,
  field text not null,
  value jsonb,
  language text,
  source text not null ${oneOf("source", SOURCE)},
  source_revision text,
  fetched_at timestamptz not null default now(),
  ${target.replace("{t}", "metadata_field")}`,
)}
create unique index metadata_field_key on metadata_field (media_entity_id, content_unit_id, field, source, language) nulls not distinct;

${entityTable(
  "field_override",
  `
  media_entity_id uuid references media_entity (id) on delete cascade,
  content_unit_id uuid references content_unit (id) on delete cascade,
  field text not null,
  value jsonb,
  locked boolean not null default true,
  source text not null default 'user' ${oneOf("source", SOURCE)},
  reason text,
  actor_type text not null ${oneOf("actor_type", ["user", "agent", "system", "api_key"])},
  actor_id text,
  ${target.replace("{t}", "field_override")}`,
)}
create unique index field_override_key on field_override (media_entity_id, content_unit_id, field) nulls not distinct;
`,
  );
}

// biome-ignore lint/suspicious/noExplicitAny: 同上
export async function down(db: Kysely<any>): Promise<void> {
  await execDdl(db, dropTables(["field_override", "metadata_field"]));
}