# All files / src/tools analyzeCountryDelegation.ts

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     /**
     * MCP Tool: analyze_country_delegation
     *
     * Analyze how a country's MEP delegation votes, collaborates, and
     * distributes across political groups—revealing national voting patterns
     * and cross-group alignment within a member state's EP representation.
     *
     * **Intelligence Perspective:** Country delegation analysis uncovers national
     * interest patterns that cut across political group lines—essential for
     * identifying when national priorities override party discipline.
     *
     * **Business Perspective:** Enables government affairs teams to understand
     * a country's collective position on policy domains for targeted advocacy.
     *
     * ISMS Policy: SC-002 (Input Validation), AC-003 (Least Privilege)
     */

    import { z } from 'zod';
    import { epClient } from '../clients/europeanParliamentClient.js';
    import type { MEPDetails } from '../types/europeanParliament.js';
    import type { ToolResult } from './shared/types.js';

    /**
     * Schema for analyze_country_delegation tool input
     */
    export const AnalyzeCountryDelegationSchema = z.object({
      country: z.string()
        .length(2)
        .regex(/^[A-Z]{2}$/, 'Country code must be 2 uppercase letters')
        .describe('ISO 3166-1 alpha-2 country code (e.g., "SE", "DE", "FR")'),
      dateFrom: z.string()
        .regex(/^\d{4}-\d{2}-\d{2}$/, 'Date must be in YYYY-MM-DD format')
        .optional()
        .describe('Start date for analysis period'),
      dateTo: z.string()
        .regex(/^\d{4}-\d{2}-\d{2}$/, 'Date must be in YYYY-MM-DD format')
        .optional()
        .describe('End date for analysis period')
    });

    /**
     * Political group distribution entry
     */
    interface GroupDistribution {
      group: string;
      count: number;
      percentage: number;
    }

    /**
     * Country delegation analysis result
     */
    interface CountryDelegationAnalysis {
      country: string;
      period: { from: string; to: string };
      delegation: {
        totalMEPs: number;
        activeMEPs: number;
        groupDistribution: GroupDistribution[];
      };
      votingBehavior: {
        averageAttendance: number;
        averageLoyalty: number;
        nationalCohesion: number;
      };
      committeePresence: {
        committeesRepresented: number;
        leadershipRoles: number;
      };
      computedAttributes: {
        delegationInfluence: string;
        nationalCohesionLevel: string;
        groupFragmentation: string;
        engagementLevel: string;
      };
      confidenceLevel: 'HIGH' | 'MEDIUM' | 'LOW';
      dataFreshness: string;
      sourceAttribution: string;
      methodology: string;
      dataQualityWarnings: string[];
    }

    /**
     * Compute group distribution from MEP list
     */
    function computeGroupDistribution(
      meps: { politicalGroup: string }[]
    ): GroupDistribution[] {
      const counts = new Map<string, number>();
      for (const mep of meps) {
        const group = mep.politicalGroup;
        counts.set(group, (counts.get(group) ?? 0) + 1);
      }

      const total = meps.length;
      return Array.from(counts.entries())
        .map(([group, count]) => ({
          group,
          count,
          percentage: Math.round((count / Math.max(1, total)) * 10000) / 100
        }))
        .sort((a, b) => b.count - a.count);
    }

    /**
     * Compute group fragmentation index (Simpson's diversity)
     */
    function computeFragmentation(distribution: GroupDistribution[]): string {
      const total = distribution.reduce((s, d) => s + d.count, 0);
      if (total === 0) return 'UNKNOWN';

      let sumSquares = 0;
      for (const d of distribution) {
        const p = d.count / total;
        sumSquares += p * p;
      }
      const diversity = 1 - sumSquares;

      if (diversity > 0.7) return 'HIGH';
      if (diversity > 0.4) return 'MODERATE';
      return 'LOW';
    }

    /**
     * Compute delegation influence level
     */
    function computeInfluence(totalMEPs: number, leadershipRoles: number): string {
      const score = totalMEPs * 0.3 + leadershipRoles * 5;
      if (score > 30) return 'HIGH';
      Iif (score > 15) return 'MODERATE';
      return 'LOW';
    }

    /**
     * Compute confidence level from data coverage ratio
     */
    function computeDataConfidence(dataCoverage: number): 'HIGH' | 'MEDIUM' | 'LOW' {
      if (dataCoverage > 0.8) return 'HIGH';
      if (dataCoverage > 0.4) return 'MEDIUM';
      return 'LOW';
    }

    /**
     * Compute engagement level from attendance
     */
    function computeEngagement(avgAttendance: number): string {
      if (avgAttendance >= 80) return 'HIGH';
      Iif (avgAttendance >= 60) return 'MODERATE';
      return 'LOW';
    }

    /**
     * Compute national cohesion level
     */
    function computeCohesionLevel(cohesion: number): string {
      if (cohesion >= 70) return 'HIGH';
      Iif (cohesion >= 50) return 'MODERATE';
      return 'LOW';
    }

    /**
     * Fetch MEP details, collecting fulfilled results
     */
    async function fetchMepDetails(
      meps: { id: string }[]
    ): Promise<MEPDetails[]> {
      const details: MEPDetails[] = [];
      const batch = meps.slice(0, 50);
      const batchSize = 5;

      for (let i = 0; i < batch.length; i += batchSize) {
        const chunk = batch.slice(i, i + batchSize);
        const results = await Promise.allSettled(
          chunk.map((mep: { id: string }) => epClient.getMEPDetails(mep.id))
        );
        for (const r of results) {
          if (r.status === 'fulfilled') {
            details.push(r.value);
          }
        }
      }
      return details;
    }

    /**
     * Compute committee presence from MEP details
     */
    function computeCommitteePresence(
      details: MEPDetails[]
    ): { committeesRepresented: number; leadershipRoles: number } {
      const allCommittees = new Set<string>();
      let leadershipRoles = 0;
      for (const mep of details) {
        for (const c of mep.committees) {
          allCommittees.add(c);
        }
        if (Array.isArray(mep.roles)) {
          leadershipRoles += mep.roles.length;
        }
      }
      return { committeesRepresented: allCommittees.size, leadershipRoles };
    }

    /**
     * Build delegation analysis from MEP details
     */
    async function buildDelegationAnalysis(
      country: string,
      dateFrom: string,
      dateTo: string
    ): Promise<CountryDelegationAnalysis> {
      const mepResult = await epClient.getCurrentMEPs({
        country,
        limit: 100
      });

      const meps = Array.isArray(mepResult.data) ? mepResult.data : [];
      const totalMEPs = meps.length;

      const details = await fetchMepDetails(meps);

      const distribution = computeGroupDistribution(
        meps
      );

      const attendances = details
        .map(d => d.votingStatistics?.attendanceRate)
        .filter((a): a is number => a !== undefined);

      const avgAttendance = attendances.length > 0
        ? Math.round(attendances.reduce((s, a) => s + a, 0) / attendances.length * 100) / 100
        : 0;

      const committeePresence = computeCommitteePresence(details);

      const topGroupShare = distribution[0]?.percentage ?? 0;
      const nationalCohesion = Math.min(100, topGroupShare + 10);

      const dataCoverage = totalMEPs > 0 ? attendances.length / totalMEPs : 0;

      return {
        country,
        period: { from: dateFrom, to: dateTo },
        delegation: {
          totalMEPs,
          activeMEPs: totalMEPs,
          groupDistribution: distribution
        },
        votingBehavior: {
          averageAttendance: avgAttendance,
          averageLoyalty: Math.round(Math.max(60, 95 - distribution.length * 5) * 100) / 100,
          nationalCohesion: Math.round(nationalCohesion * 100) / 100
        },
        committeePresence,
        computedAttributes: {
          delegationInfluence: computeInfluence(totalMEPs, committeePresence.leadershipRoles),
          nationalCohesionLevel: computeCohesionLevel(nationalCohesion),
          groupFragmentation: computeFragmentation(distribution),
          engagementLevel: computeEngagement(avgAttendance)
        },
        confidenceLevel: computeDataConfidence(dataCoverage),
        dataFreshness: 'Real-time EP API data — country delegation composition from current MEP records',
        sourceAttribution: 'European Parliament Open Data Portal - data.europarl.europa.eu',
        methodology: 'Country delegation analysis using EP Open Data: political group distribution, '
          + 'voting behavior aggregation, committee representation mapping, and national cohesion scoring. '
          + 'Data source: European Parliament Open Data Portal.',
        dataQualityWarnings: [
          ...(dataCoverage < 1 ? [`Voting statistics available for ${String(Math.round(dataCoverage * 100))}% of delegation MEPs`] : []),
          'National cohesion includes +10 baseline offset (proxy for national-interest voting beyond group lines)',
          ...(attendances.length === 0 ? ['No MEP voting statistics available — attendance is unavailable and loyalty is a proxy-derived estimate based on group fragmentation'] : []),
        ],
      };
    }

    /**
     * Handles the analyze_country_delegation MCP tool request.
     *
     * Analyses an EU member state's MEP delegation in the European Parliament, covering
     * political group distribution, aggregate voting behaviour, committee presence, and a
     * national cohesion score. Reveals national interest patterns that can cut across
     * political group lines, supporting targeted government-affairs advocacy.
     *
     * @param args - Raw tool arguments, validated against {@link AnalyzeCountryDelegationSchema}
     * @returns MCP tool result containing a {@link CountryDelegationAnalysis} object with
     *   delegation breakdown, computed attributes, confidence level, and methodology note
     * @throws - If `args` fails schema validation (e.g., missing required `country`, non-uppercase code)
     * - If the European Parliament API is unreachable or returns an error response
     *
     * @example
     * ```typescript
     * const result = await handleAnalyzeCountryDelegation({
     *   country: 'SE',
     *   dateFrom: '2024-01-01',
     *   dateTo: '2024-12-31'
     * });
     * // Returns political group distribution, voting behaviour, and cohesion score for Sweden's MEPs
     * ```
     *
     * @security Input is validated with Zod before any API call.
     *   Country code is validated against a strict regex to prevent injection.
     *   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 analyzeCountryDelegationToolMetadata} for MCP schema registration
     * @see {@link handleAnalyzeCommitteeActivity} for per-committee workload analysis
     */
    export async function handleAnalyzeCountryDelegation(
      args: unknown
    ): Promise<ToolResult> {
      const params = AnalyzeCountryDelegationSchema.parse(args);

      const now = new Date();
      const dateFrom = params.dateFrom ?? new Date(
        now.getFullYear() - 1,
        now.getMonth(),
        now.getDate()
      ).toISOString().split('T')[0] ?? '';
      const dateTo = params.dateTo ?? now.toISOString().split('T')[0] ?? '';

      const analysis = await buildDelegationAnalysis(
        params.country,
        dateFrom,
        dateTo
      );

      return {
        content: [
          {
            type: 'text',
            text: JSON.stringify(analysis, null, 2)
          }
        ]
      };
    }

    /**
     * Tool metadata for MCP listing
     */
    export const analyzeCountryDelegationToolMetadata = {
      name: 'analyze_country_delegation',
      description: 'Analyze a country\'s MEP delegation in the European Parliament — political group distribution, voting behavior, committee presence, and national cohesion. Reveals national interest patterns that cut across party lines.',
      inputSchema: {
        type: 'object' as const,
        properties: {
          country: {
            type: 'string',
            description: 'ISO 3166-1 alpha-2 country code (e.g., "SE", "DE", "FR")'
          },
          dateFrom: {
            type: 'string',
            description: 'Start date (YYYY-MM-DD)'
          },
          dateTo: {
            type: 'string',
            description: 'End date (YYYY-MM-DD)'
          }
        },
        required: ['country']
      }
    };