import type { CodingPluginToolDefinition } from '../../shared/coding-plugins';
import type {
  DevicePackageIndexV1,
  DevicePackageToolDetailsV1,
  DevicePackageToolOperation,
  InstallPreviewV1,
} from '../../shared/device-packages';
import type { DevicePackageToolName } from '../../shared/device-packages';
import type { PiProductToolResult } from '../coding-runtime/pi/product-tools';
import type { DevicePackageManager } from './device-package-manager';

export { DEVICE_PACKAGE_TOOL_NAMES } from '../../shared/device-packages';

const EMPTY_OBJECT_SCHEMA = Object.freeze({
  type: 'object', additionalProperties: false, properties: {},
});

function tool(
  name: DevicePackageToolName,
  label: string,
  description: string,
  operation: DevicePackageToolOperation,
  mutation: 'read' | 'write' | 'destructive',
  inputSchema: Readonly<Record<string, unknown>>,
): CodingPluginToolDefinition {
  return Object.freeze({
    name,
    label,
    description,
    capabilityId: 'makelore.device-packages',
    operation,
    roles: ['parent'],
    mutation,
    projectWriteLease: false,
    permissions: ['device-packages'],
    inputSchema,
  });
}

export const DEVICE_PACKAGE_TOOL_DEFINITIONS = Object.freeze([
  tool(
    'local_package_prepare',
    'Prepare local package',
    'Resolve an npm, Git, or absolute local Pi package/Skill and show an exact installation preview. This does not install it.',
    'prepare',
    'read',
    {
      type: 'object', additionalProperties: false, required: ['source'],
      properties: { source: { type: 'string', minLength: 1, maxLength: 2048 } },
    },
  ),
  tool(
    'local_package_commit',
    'Install local package',
    'Install a prepared device package only after the user confirms in a later message.',
    'commit',
    'write',
    {
      type: 'object', additionalProperties: false, required: ['planId', 'confirmed'],
      properties: {
        planId: { type: 'string', minLength: 1, maxLength: 128 },
        confirmed: { const: true },
      },
    },
  ),
  tool('local_package_list', 'List local packages', 'List packages installed on this device.', 'list', 'read', EMPTY_OBJECT_SCHEMA),
  tool(
    'local_package_set_enabled',
    'Enable or disable local package',
    'Enable or disable an installed device package for future parent workers.',
    'set_enabled',
    'write',
    {
      type: 'object', additionalProperties: false, required: ['packageId', 'enabled'],
      properties: {
        packageId: { type: 'string', minLength: 1, maxLength: 128 },
        enabled: { type: 'boolean' },
      },
    },
  ),
  tool(
    'local_package_uninstall',
    'Remove local package',
    'Remove an installed package from this device after explicit confirmation.',
    'uninstall',
    'destructive',
    {
      type: 'object', additionalProperties: false, required: ['packageId', 'confirmed'],
      properties: {
        packageId: { type: 'string', minLength: 1, maxLength: 128 },
        confirmed: { const: true },
      },
    },
  ),
]);

function record(value: unknown): Record<string, unknown> {
  if (!value || typeof value !== 'object' || Array.isArray(value)) throw new Error('Local package tool input is invalid');
  return value as Record<string, unknown>;
}

function exact(input: Record<string, unknown>, keys: readonly string[]): void {
  const actual = Object.keys(input).sort();
  const expected = [...keys].sort();
  if (actual.length !== expected.length || actual.some((key, index) => key !== expected[index])) {
    throw new Error('Local package tool input has unexpected fields');
  }
}

function boundedString(value: unknown, name: string, maximum: number): string {
  if (typeof value !== 'string' || !value.trim() || value.length > maximum) throw new Error(`${name} is invalid`);
  return value.trim();
}

function result(
  operation: DevicePackageToolOperation,
  value: { preview?: InstallPreviewV1; index?: DevicePackageIndexV1 },
): PiProductToolResult {
  const details: DevicePackageToolDetailsV1 = {
    schema: 'makelore-device-package.v1', operation, success: true, ...value,
  };
  return { content: [{ type: 'text', text: JSON.stringify(details) }], details };
}

export class DevicePackageTools {
  readonly tools = DEVICE_PACKAGE_TOOL_DEFINITIONS;

  constructor(private readonly manager: DevicePackageManager) {}

  async invoke(toolName: string, turnId: string, value: unknown): Promise<PiProductToolResult> {
    const input = record(value);
    switch (toolName) {
      case 'local_package_prepare': {
        exact(input, ['source']);
        return result('prepare', {
          preview: await this.manager.prepare(boundedString(input.source, 'source', 2048), turnId),
        });
      }
      case 'local_package_commit': {
        exact(input, ['planId', 'confirmed']);
        return result('commit', {
          index: await this.manager.commit(
            boundedString(input.planId, 'planId', 128),
            input.confirmed as true,
            turnId,
          ),
        });
      }
      case 'local_package_list':
        exact(input, []);
        return result('list', { index: await this.manager.list() });
      case 'local_package_set_enabled': {
        exact(input, ['packageId', 'enabled']);
        if (typeof input.enabled !== 'boolean') throw new Error('enabled is invalid');
        return result('set_enabled', {
          index: await this.manager.setEnabled(
            boundedString(input.packageId, 'packageId', 128),
            input.enabled,
          ),
        });
      }
      case 'local_package_uninstall': {
        exact(input, ['packageId', 'confirmed']);
        if (input.confirmed !== true) throw new Error('Literal confirmation is required');
        return result('uninstall', {
          index: await this.manager.uninstall(boundedString(input.packageId, 'packageId', 128)),
        });
      }
      default:
        throw new Error('Local package tool is unavailable');
    }
  }
}