import { MigrationInterface, QueryRunner } from 'typeorm';

export class AddDeviceLogs1744540100000 implements MigrationInterface {
  name = 'AddDeviceLogs1744540100000';

  public async up(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`
      CREATE TABLE "device_logs" (
        "id"          UUID DEFAULT uuid_generate_v4() NOT NULL,
        "device_id"   UUID NOT NULL,
        "level"       SMALLINT NOT NULL,
        "msg"         TEXT NOT NULL,
        "logger_name" VARCHAR(64),
        "context"     JSONB,
        "logged_at"   TIMESTAMPTZ NOT NULL,
        "created_at"  TIMESTAMPTZ NOT NULL DEFAULT NOW(),

        CONSTRAINT "PK_device_logs" PRIMARY KEY ("id"),
        CONSTRAINT "FK_device_logs_device"
          FOREIGN KEY ("device_id") REFERENCES "devices"("id") ON DELETE CASCADE
      );

      -- Primary query pattern: recent logs for a device
      CREATE INDEX "IDX_device_logs_device_logged"
        ON "device_logs" ("device_id", "logged_at" DESC);

      -- Filter by level (e.g. show only errors)
      CREATE INDEX "IDX_device_logs_device_level"
        ON "device_logs" ("device_id", "level");

      -- Purge old logs
      CREATE INDEX "IDX_device_logs_logged"
        ON "device_logs" ("logged_at");
    `);
  }

  public async down(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`DROP TABLE IF EXISTS "device_logs";`);
  }
}