import { MigrationInterface, QueryRunner } from 'typeorm';

const newPermissions = [
  'inspection_acts.read',
  'inspection_acts.create',
  'inspection_acts.update',
  'inspection_acts.cancel',
] as const;

const rolePermissionValues = `
  ('admin', 'inspection_acts.read'),
  ('admin', 'inspection_acts.create'),
  ('admin', 'inspection_acts.update'),
  ('admin', 'inspection_acts.cancel'),
  ('director', 'inspection_acts.read'),
  ('supervisor', 'inspection_acts.read'),
  ('supervisor', 'inspection_acts.create'),
  ('supervisor', 'inspection_acts.update'),
  ('supervisor', 'inspection_acts.cancel'),
  ('inspector', 'inspection_acts.read'),
  ('inspector', 'inspection_acts.create'),
  ('inspector', 'inspection_acts.update'),
  ('auditor', 'inspection_acts.read')
`;

function quoteIdentifier(identifier: string): string {
  return `"${identifier.replaceAll('"', '""')}"`;
}

export class PhaseD2InspectionActs1787068800000 implements MigrationInterface {
  name = 'PhaseD2InspectionActs1787068800000';

  public async up(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`
      CREATE TABLE document_annual_sequences (
        document_type varchar(20) NOT NULL,
        year integer NOT NULL,
        last_number integer NOT NULL DEFAULT 0,
        updated_at timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
        PRIMARY KEY (document_type, year),
        CONSTRAINT chk_document_annual_sequences_type CHECK (
          document_type IN ('ACT', 'REPORT')
        ),
        CONSTRAINT chk_document_annual_sequences_year CHECK (
          year BETWEEN 2000 AND 9999
        ),
        CONSTRAINT chk_document_annual_sequences_number CHECK (
          last_number >= 0
        )
      )
    `);

    await queryRunner.query(`
      CREATE TABLE inspection_acts (
        id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
        visit_id uuid NOT NULL,
        act_year integer NOT NULL,
        act_number integer NOT NULL,
        code varchar(24) NOT NULL,
        status varchar(24) NOT NULL DEFAULT 'DRAFT',
        occurred_at timestamptz NOT NULL,
        title varchar(200) NOT NULL,
        summary text NOT NULL,
        observations text,
        current_version integer NOT NULL DEFAULT 0,
        cancellation_reason text,
        created_by uuid,
        updated_by uuid,
        created_at timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
        updated_at timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
        CONSTRAINT uq_inspection_acts_year_number UNIQUE (act_year, act_number),
        CONSTRAINT uq_inspection_acts_code UNIQUE (code),
        CONSTRAINT chk_inspection_acts_year CHECK (act_year BETWEEN 2000 AND 9999),
        CONSTRAINT chk_inspection_acts_number CHECK (act_number > 0),
        CONSTRAINT chk_inspection_acts_code CHECK (
          code ~ '^ACTA-[0-9]{4}-[0-9]{6}$'
        ),
        CONSTRAINT chk_inspection_acts_status CHECK (
          status IN ('DRAFT', 'READY', 'CLOSED', 'CANCELLED', 'RECTIFIED')
        ),
        CONSTRAINT chk_inspection_acts_current_version CHECK (current_version >= 0),
        CONSTRAINT chk_inspection_acts_cancellation CHECK (
          status <> 'CANCELLED' OR LENGTH(TRIM(COALESCE(cancellation_reason, ''))) >= 10
        ),
        CONSTRAINT fk_inspection_acts_visit FOREIGN KEY (visit_id)
          REFERENCES inspection_visits(id) ON DELETE RESTRICT,
        CONSTRAINT fk_inspection_acts_created_by FOREIGN KEY (created_by)
          REFERENCES users(id) ON DELETE SET NULL,
        CONSTRAINT fk_inspection_acts_updated_by FOREIGN KEY (updated_by)
          REFERENCES users(id) ON DELETE SET NULL
      )
    `);
    await queryRunner.query(`CREATE INDEX idx_inspection_acts_visit_status ON inspection_acts (visit_id, status)`);
    await queryRunner.query(`CREATE INDEX idx_inspection_acts_occurred_at ON inspection_acts (occurred_at)`);
    await queryRunner.query(`CREATE INDEX idx_inspection_acts_created_by ON inspection_acts (created_by)`);

    await queryRunner.query(`
      CREATE TABLE inspection_act_assets (
        act_id uuid NOT NULL,
        asset_id uuid NOT NULL,
        included boolean NOT NULL DEFAULT true,
        added_by uuid,
        created_at timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
        updated_at timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
        PRIMARY KEY (act_id, asset_id),
        CONSTRAINT fk_inspection_act_assets_act FOREIGN KEY (act_id)
          REFERENCES inspection_acts(id) ON DELETE RESTRICT,
        CONSTRAINT fk_inspection_act_assets_asset FOREIGN KEY (asset_id)
          REFERENCES assets(id) ON DELETE RESTRICT,
        CONSTRAINT fk_inspection_act_assets_added_by FOREIGN KEY (added_by)
          REFERENCES users(id) ON DELETE SET NULL
      )
    `);
    await queryRunner.query(`CREATE INDEX idx_inspection_act_assets_asset_id ON inspection_act_assets (asset_id)`);
    await queryRunner.query(`CREATE INDEX idx_inspection_act_assets_included ON inspection_act_assets (act_id, included)`);

    await queryRunner.query(`
      CREATE TABLE inspection_act_versions (
        id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
        act_id uuid NOT NULL,
        version_number integer NOT NULL,
        event varchar(24) NOT NULL,
        snapshot jsonb NOT NULL,
        actor_user_id uuid,
        actor_username varchar(80),
        created_at timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
        CONSTRAINT uq_inspection_act_versions_number UNIQUE (act_id, version_number),
        CONSTRAINT chk_inspection_act_versions_number CHECK (version_number > 0),
        CONSTRAINT chk_inspection_act_versions_event CHECK (
          event IN ('CREATED', 'UPDATED', 'CANCELLED')
        ),
        CONSTRAINT fk_inspection_act_versions_act FOREIGN KEY (act_id)
          REFERENCES inspection_acts(id) ON DELETE RESTRICT,
        CONSTRAINT fk_inspection_act_versions_actor FOREIGN KEY (actor_user_id)
          REFERENCES users(id) ON DELETE SET NULL
      )
    `);
    await queryRunner.query(`CREATE INDEX idx_inspection_act_versions_created_at ON inspection_act_versions (created_at)`);

    await queryRunner.query(`
      INSERT INTO permissions (code, description)
      VALUES
        ('inspection_acts.read', 'Consultar actas y sus versiones'),
        ('inspection_acts.create', 'Crear actas dentro de visitas asignadas'),
        ('inspection_acts.update', 'Actualizar actas en borrador'),
        ('inspection_acts.cancel', 'Cancelar actas en borrador')
      ON CONFLICT (code) DO UPDATE SET description = EXCLUDED.description
    `);
    await queryRunner.query(`
      WITH mapping(role_code, permission_code) AS (VALUES ${rolePermissionValues})
      INSERT INTO role_permissions (role_id, permission_id)
      SELECT role.id, permission.id
      FROM mapping
      INNER JOIN roles role ON role.code = mapping.role_code
      INNER JOIN permissions permission ON permission.code = mapping.permission_code
      ON CONFLICT (role_id, permission_id) DO NOTHING
    `);

    const appRole = process.env.DB_APP_USER;
    if (!appRole) throw new Error('Missing required environment variable: DB_APP_USER');
    const applicationRole = quoteIdentifier(appRole);
    await queryRunner.query(`
      GRANT SELECT, INSERT, UPDATE ON TABLE
        document_annual_sequences, inspection_acts, inspection_act_assets
      TO ${applicationRole}
    `);
    await queryRunner.query(`
      GRANT SELECT, INSERT ON TABLE inspection_act_versions
      TO ${applicationRole}
    `);
    await queryRunner.query(`
      REVOKE DELETE ON TABLE
        document_annual_sequences, inspection_acts,
        inspection_act_assets, inspection_act_versions
      FROM ${applicationRole}
    `);
    await queryRunner.query(`
      REVOKE UPDATE ON TABLE inspection_act_versions
      FROM ${applicationRole}
    `);
  }

  public async down(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`
      WITH mapping(role_code, permission_code) AS (VALUES ${rolePermissionValues})
      DELETE FROM role_permissions role_permission
      USING roles role, permissions permission, mapping
      WHERE role_permission.role_id = role.id
        AND role_permission.permission_id = permission.id
        AND role.code = mapping.role_code
        AND permission.code = mapping.permission_code
    `);
    await queryRunner.query(
      `DELETE FROM permissions WHERE code = ANY($1::varchar[])
       AND NOT EXISTS (
         SELECT 1 FROM role_permissions WHERE permission_id = permissions.id
       )`,
      [newPermissions],
    );
    await queryRunner.query(`DROP TABLE inspection_act_versions`);
    await queryRunner.query(`DROP TABLE inspection_act_assets`);
    await queryRunner.query(`DROP TABLE inspection_acts`);
    await queryRunner.query(`DROP TABLE document_annual_sequences`);
  }
}