import { MigrationInterface, QueryRunner } from 'typeorm';

const newPermissions = [
  'inspections.read',
  'inspections.manage',
  'inspections.assign',
  'inspections.execute',
] as const;

const rolePermissionValues = `
  ('admin', 'inspections.read'),
  ('admin', 'inspections.manage'),
  ('admin', 'inspections.assign'),
  ('admin', 'inspections.execute'),
  ('director', 'inspections.read'),
  ('supervisor', 'inspections.read'),
  ('supervisor', 'inspections.manage'),
  ('supervisor', 'inspections.assign'),
  ('supervisor', 'inspections.execute'),
  ('inspector', 'inspections.read'),
  ('inspector', 'inspections.execute'),
  ('auditor', 'inspections.read')
`;

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

export class PhaseD1InspectionVisits1786982400000 implements MigrationInterface {
  name = 'PhaseD1InspectionVisits1786982400000';

  public async up(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`
      CREATE TABLE inspection_visits (
        id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
        code varchar(80) NOT NULL,
        title varchar(200) NOT NULL,
        objective text,
        status varchar(24) NOT NULL DEFAULT 'DRAFT',
        scope_asset_id uuid,
        lead_inspector_user_id uuid,
        planned_start_at timestamptz,
        planned_end_at timestamptz,
        actual_started_at timestamptz,
        actual_closed_at timestamptz,
        instructions text,
        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_visits_code UNIQUE (code),
        CONSTRAINT chk_inspection_visits_code CHECK (
          code = UPPER(code) AND code ~ '^[A-Z0-9][A-Z0-9._/-]*$'
        ),
        CONSTRAINT chk_inspection_visits_status CHECK (
          status IN ('DRAFT', 'PLANNED', 'IN_PROGRESS', 'CLOSED', 'CANCELLED')
        ),
        CONSTRAINT chk_inspection_visits_planned_dates CHECK (
          planned_start_at IS NULL OR planned_end_at IS NULL OR planned_end_at >= planned_start_at
        ),
        CONSTRAINT chk_inspection_visits_actual_dates CHECK (
          actual_started_at IS NULL OR actual_closed_at IS NULL OR actual_closed_at >= actual_started_at
        ),
        CONSTRAINT chk_inspection_visits_cancellation CHECK (
          status <> 'CANCELLED' OR LENGTH(TRIM(COALESCE(cancellation_reason, ''))) >= 10
        ),
        CONSTRAINT fk_inspection_visits_scope_asset FOREIGN KEY (scope_asset_id)
          REFERENCES assets(id) ON DELETE RESTRICT,
        CONSTRAINT fk_inspection_visits_lead_inspector FOREIGN KEY (lead_inspector_user_id)
          REFERENCES users(id) ON DELETE SET NULL,
        CONSTRAINT fk_inspection_visits_created_by FOREIGN KEY (created_by)
          REFERENCES users(id) ON DELETE SET NULL,
        CONSTRAINT fk_inspection_visits_updated_by FOREIGN KEY (updated_by)
          REFERENCES users(id) ON DELETE SET NULL
      )
    `);
    await queryRunner.query(`CREATE INDEX idx_inspection_visits_status ON inspection_visits (status)`);
    await queryRunner.query(`CREATE INDEX idx_inspection_visits_scope_asset_id ON inspection_visits (scope_asset_id)`);
    await queryRunner.query(`CREATE INDEX idx_inspection_visits_lead_inspector_user_id ON inspection_visits (lead_inspector_user_id)`);
    await queryRunner.query(`CREATE INDEX idx_inspection_visits_planned_dates ON inspection_visits (planned_start_at, planned_end_at)`);

    await queryRunner.query(`
      CREATE TABLE inspection_visit_assets (
        visit_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 (visit_id, asset_id),
        CONSTRAINT fk_inspection_visit_assets_visit FOREIGN KEY (visit_id)
          REFERENCES inspection_visits(id) ON DELETE RESTRICT,
        CONSTRAINT fk_inspection_visit_assets_asset FOREIGN KEY (asset_id)
          REFERENCES assets(id) ON DELETE RESTRICT,
        CONSTRAINT fk_inspection_visit_assets_added_by FOREIGN KEY (added_by)
          REFERENCES users(id) ON DELETE SET NULL
      )
    `);
    await queryRunner.query(`CREATE INDEX idx_inspection_visit_assets_asset_id ON inspection_visit_assets (asset_id)`);
    await queryRunner.query(`CREATE INDEX idx_inspection_visit_assets_included ON inspection_visit_assets (visit_id, included)`);

    await queryRunner.query(`
      CREATE TABLE inspection_visit_members (
        visit_id uuid NOT NULL,
        user_id uuid NOT NULL,
        included boolean NOT NULL DEFAULT true,
        assigned_by uuid,
        created_at timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
        updated_at timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
        PRIMARY KEY (visit_id, user_id),
        CONSTRAINT fk_inspection_visit_members_visit FOREIGN KEY (visit_id)
          REFERENCES inspection_visits(id) ON DELETE RESTRICT,
        CONSTRAINT fk_inspection_visit_members_user FOREIGN KEY (user_id)
          REFERENCES users(id) ON DELETE RESTRICT,
        CONSTRAINT fk_inspection_visit_members_assigned_by FOREIGN KEY (assigned_by)
          REFERENCES users(id) ON DELETE SET NULL
      )
    `);
    await queryRunner.query(`CREATE INDEX idx_inspection_visit_members_user_id ON inspection_visit_members (user_id)`);
    await queryRunner.query(`CREATE INDEX idx_inspection_visit_members_included ON inspection_visit_members (visit_id, included)`);

    await queryRunner.query(`
      INSERT INTO permissions (code, description)
      VALUES
        ('inspections.read', 'Consultar visitas de inspección'),
        ('inspections.manage', 'Crear y planificar visitas de inspección'),
        ('inspections.assign', 'Asignar equipos de inspección'),
        ('inspections.execute', 'Iniciar y ejecutar visitas asignadas')
      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
        inspection_visits, inspection_visit_assets, inspection_visit_members
      TO ${applicationRole}
    `);
    await queryRunner.query(`
      REVOKE DELETE ON TABLE
        inspection_visits, inspection_visit_assets, inspection_visit_members
      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_visit_members`);
    await queryRunner.query(`DROP TABLE inspection_visit_assets`);
    await queryRunner.query(`DROP TABLE inspection_visits`);
  }
}