from tortoise import BaseDBAsyncClient

RUN_IN_TRANSACTION = True


async def upgrade(db: BaseDBAsyncClient) -> str:
    return """
        -- SQLite doesn't support ADD CONSTRAINT, so we need to recreate the table
        CREATE TABLE "conversations_new" (
            "id" CHAR(36) NOT NULL PRIMARY KEY,
            "name" VARCHAR(255) NOT NULL,
            "created_at" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
            "updated_at" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
            "user_id" CHAR(36),
            FOREIGN KEY ("user_id") REFERENCES "users" ("id") ON DELETE CASCADE
        );
        INSERT INTO "conversations_new" ("id", "name", "created_at", "updated_at")
        SELECT "id", "name", "created_at", "updated_at" FROM "conversations";
        DROP TABLE "conversations";
        ALTER TABLE "conversations_new" RENAME TO "conversations";"""


async def downgrade(db: BaseDBAsyncClient) -> str:
    return """
        -- Recreate table without user_id column
        CREATE TABLE "conversations_new" (
            "id" CHAR(36) NOT NULL PRIMARY KEY,
            "name" VARCHAR(255) NOT NULL,
            "created_at" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
            "updated_at" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
        );
        INSERT INTO "conversations_new" ("id", "name", "created_at", "updated_at")
        SELECT "id", "name", "created_at", "updated_at" FROM "conversations";
        DROP TABLE "conversations";
        ALTER TABLE "conversations_new" RENAME TO "conversations";"""


MODELS_STATE = (
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)