/**
 * MCP Tool: get_speeches
 *
 * Retrieve European Parliament plenary speeches and speech-related activities.
 * Supports single speech lookup by speechId or list with date range filtering.
 *
 * **Intelligence Perspective:** Speech data enables content analysis of MEP positions,
 * rhetorical patterns, and policy priorities across plenary debates.
 *
 * **Business Perspective:** Speech transcripts power NLP-based products, sentiment
 * analysis dashboards, and topic monitoring services.
 *
 * **EP API Endpoints:**
 * - `GET /speeches` (list)
 * - `GET /speeches/{speech-id}` (single)
 *
 * ISMS Policy: SC-002 (Input Validation), AC-003 (Least Privilege)
 */

import { GetSpeechesSchema } from '../schemas/europeanParliament.js';
import { epClient } from '../clients/europeanParliamentClient.js';
import { buildToolResponse } from './shared/responseBuilder.js';
import { buildApiParams } from './shared/paramBuilder.js';
import { ToolError } from './shared/errors.js';
import { z } from 'zod';
import type { ToolResult } from './shared/types.js';

/**
 * Handles the get_speeches MCP tool request.
 *
 * Retrieves European Parliament plenary speeches and debate contributions.
 * Supports single speech lookup by speechId or a filtered list by date range.
 *
 * @param args - Raw tool arguments, validated against {@link GetSpeechesSchema}
 * @returns MCP tool result containing either a single speech record or a paginated list of speeches
 * @throws - If `args` fails schema validation (e.g., missing required fields or invalid format)
 * - If the European Parliament API is unreachable or returns an error response
 *
 * @example
 * ```typescript
 * // Single speech lookup
 * const result = await handleGetSpeeches({ speechId: 'SPEECH-2024-001' });
 * // Returns the full record for the specified speech
 *
 * // List speeches with date filter
 * const list = await handleGetSpeeches({ dateFrom: '2024-01-01', dateTo: '2024-03-31', limit: 50 });
 * // Returns up to 50 speeches from Q1 2024
 * ```
 *
 * @security - Input is validated with Zod before any API call.
 * - Personal data in responses is minimised per GDPR Article 5(1)(c).
 * - All requests are rate-limited and audit-logged per ISMS Policy AU-002.
 * @since 0.8.0
 * @see {@link getSpeechesToolMetadata} for MCP schema registration
 * @see {@link handleGetMeetingActivities} for retrieving broader meeting-level activities
 */
export async function handleGetSpeeches(args: unknown): Promise<ToolResult> {
  let params: ReturnType<typeof GetSpeechesSchema.parse>;
  try {
    params = GetSpeechesSchema.parse(args);
  } catch (error: unknown) {
    if (error instanceof z.ZodError) {
      const fieldErrors = error.issues.map((e) => `${e.path.join('.')}: ${e.message}`).join('; ');
      throw new ToolError({
        toolName: 'get_speeches',
        operation: 'validateInput',
        message: `Invalid parameters: ${fieldErrors}`,
        isRetryable: false,
        cause: error,
      });
    }
    throw error;
  }

  try {
    if (params.speechId !== undefined) {
      const result = await epClient.getSpeechById(params.speechId);
      return buildToolResponse(result);
    }

    const apiParams = {
      limit: params.limit,
      offset: params.offset,
      ...buildApiParams(params, [
        { from: 'dateFrom', to: 'dateFrom' },
        { from: 'dateTo', to: 'dateTo' },
      ]),
    };

    const result = await epClient.getSpeeches(
      apiParams
    );

    return buildToolResponse(result);
  } catch (error: unknown) {
    throw new ToolError({
      toolName: 'get_speeches',
      operation: 'fetchData',
      message: 'Failed to retrieve speeches',
      isRetryable: true,
      cause: error,
    });
  }
}
/** Tool metadata for get_speeches */
export const getSpeechesToolMetadata = {
  name: 'get_speeches',
  description:
    'Get European Parliament plenary speeches and debate contributions. Supports single speech lookup by speechId or list with date range filtering (dateFrom/dateTo mapped to EP API sitting-date/sitting-date-end). Data source: European Parliament Open Data Portal.',
  inputSchema: {
    type: 'object' as const,
    properties: {
      speechId: { type: 'string', description: 'Speech ID for single speech lookup' },
      dateFrom: { type: 'string', description: 'Start date (YYYY-MM-DD). Mapped to EP API sitting-date parameter.' },
      dateTo: { type: 'string', description: 'End date (YYYY-MM-DD). Mapped to EP API sitting-date-end parameter.' },
      limit: { type: 'number', description: 'Maximum results to return (1-100)', default: 50 },
      offset: { type: 'number', description: 'Pagination offset', default: 0 },
    },
  },
};
