/**
 * Bulk Deal Negotiations System
 * Enables complex multi-party negotiations for large-scale AI agent transactions
 */

import type { Address } from '@solana/addresses';
import type { Rpc, SolanaRpcApi } from '@solana/rpc';
import type { Commitment } from '@solana/rpc-types';
import type { KeyPairSigner } from '@solana/signers';
import { sendAndConfirmTransactionFactory } from '../utils/transaction-helpers.js';

/**
 * Types of bulk deals supported
 */
export type BulkDealType = 
  | 'agent_bundle'        // Multiple agents sold together
  | 'service_package'     // Package of different services
  | 'subscription_tier'   // Tiered subscription with multiple services
  | 'enterprise_license'  // Enterprise licensing deal
  | 'volume_discount'     // Volume-based pricing
  | 'consortium_deal'     // Multi-buyer consortium purchase
  | 'cross_platform'      // Cross-platform integration deal
  | 'revenue_share';      // Revenue sharing agreement

/**
 * Negotiation status states
 */
export type NegotiationStatus = 
  | 'draft'              // Initial proposal being drafted
  | 'proposed'           // Proposal sent to counterparties
  | 'under_review'       // Being reviewed by parties
  | 'counter_proposed'   // Counter-proposal made
  | 'negotiating'        // Active negotiation phase
  | 'pending_approval'   // Waiting for final approvals
  | 'approved'           // All parties approved
  | 'rejected'           // Deal rejected
  | 'expired'            // Negotiation period expired
  | 'executed'           // Deal executed successfully
  | 'disputed';          // Under dispute resolution

/**
 * Party role in negotiation
 */
export type PartyRole = 
  | 'initiator'          // Started the negotiation
  | 'primary_seller'     // Main seller
  | 'co_seller'          // Additional seller
  | 'buyer'              // Purchasing party
  | 'co_buyer'           // Joint purchasing party
  | 'intermediary'       // Broker or facilitator
  | 'arbitrator'         // Dispute resolver
  | 'observer';          // Read-only participant

/**
 * Negotiation terms and conditions
 */
export interface INegotiationTerms {
  // Pricing structure
  basePrice: bigint;
  volumeDiscounts: Array<{
    minQuantity: number;
    discountPercentage: number;
  }>;
  paymentSchedule: Array<{
    percentage: number;
    dueDate: number; // Timestamp
    description: string;
  }>;
  
  // Delivery and performance
  deliverySchedule: Array<{
    milestone: string;
    deliverable: string;
    dueDate: number;
    penaltyClause?: {
      type: 'percentage' | 'fixed';
      amount: bigint;
    };
  }>;
  
  // Quality and service levels
  serviceLevel: {
    uptime: number;           // Percentage
    responseTime: number;     // Milliseconds
    throughput: number;       // Transactions per second
    accuracy: number;         // Percentage
  };
  
  // Legal and compliance
  exclusivity: {
    isExclusive: boolean;
    territory?: string[];
    duration?: number;        // Milliseconds
  };
  intellectualProperty: {
    ownership: 'seller' | 'buyer' | 'shared';
    licenseTerms?: string;
    modifications: 'allowed' | 'restricted' | 'prohibited';
  };
  
  // Risk and insurance
  liability: {
    cap: bigint;
    insurance: boolean;
    indemnification: string[];
  };
  warrantiesAndGuarantees: string[];
  
  // Termination and renewal
  termination: {
    noticePeriod: number;     // Milliseconds
    conditions: string[];
    penaltyClause?: bigint;
  };
  renewalOptions: {
    autoRenewal: boolean;
    renewalTerms?: Partial<INegotiationTerms>;
    noticePeriod?: number;
  };
}

/**
 * Negotiation party information
 */
export interface INegotiationParty {
  address: Address;
  role: PartyRole;
  name: string;
  organization?: string;
  reputation: number;
  
  // Participation status
  hasJoined: boolean;
  lastActive: number;
  approvalStatus: 'pending' | 'approved' | 'rejected';
  
  // Negotiation power and constraints
  votingWeight: number;     // 0-100
  decisionAuthority: {
    canApprove: boolean;
    canVeto: boolean;
    canModifyTerms: boolean;
  };
  
  // Contact and communication
  preferredCommunication: 'on_chain' | 'off_chain' | 'hybrid';
  responseTimeTarget: number; // Expected response time in ms
  timezone?: string;
}

/**
 * Proposal or counter-proposal in negotiation
 */
export interface INegotiationProposal {
  proposalId: Address;
  proposer: Address;
  timestamp: number;
  version: number;
  
  // Proposal content
  title: string;
  description: string;
  terms: INegotiationTerms;
  items: Array<{
    itemId: Address;
    itemType: 'agent' | 'service' | 'license' | 'data';
    quantity: number;
    unitPrice: bigint;
    specifications?: Record<string, any>;
  }>;
  
  // Proposal metadata
  isCounterProposal: boolean;
  parentProposalId?: Address;
  changes?: Array<{
    field: string;
    oldValue: any;
    newValue: any;
    justification: string;
  }>;
  
  // Responses from parties
  responses: Array<{
    party: Address;
    response: 'accept' | 'reject' | 'counter' | 'pending';
    timestamp: number;
    comments?: string;
    suggestedChanges?: string[];
  }>;
  
  // Voting and consensus
  votingDeadline: number;
  requiredApprovals: number;
  currentApprovals: number;
  consensusThreshold: number; // Percentage needed to approve
}

/**
 * Complete bulk deal negotiation
 */
export interface IBulkDealNegotiation {
  negotiationId: Address;
  dealType: BulkDealType;
  initiator: Address;
  title: string;
  description: string;
  
  // Negotiation state
  status: NegotiationStatus;
  currentPhase: 'initiation' | 'information_sharing' | 'proposal' | 'bargaining' | 'closure';
  createdAt: number;
  lastActivity: number;
  deadline?: number;
  
  // Participants
  parties: INegotiationParty[];
  maxParticipants?: number;
  invitationOnly: boolean;
  
  // Proposals and history
  proposals: INegotiationProposal[];
  currentProposal?: Address;
  negotiationHistory: Array<{
    timestamp: number;
    actor: Address;
    action: string;
    details: string;
  }>;
  
  // Deal structure
  estimatedValue: bigint;
  totalItems: number;
  categories: string[];
  
  // Communication and process
  communicationChannels: Array<{
    type: 'on_chain_messages' | 'private_channel' | 'video_conference' | 'document_sharing';
    enabled: boolean;
    configuration?: Record<string, any>;
  }>;
  
  // Legal and compliance
  jurisdiction: string;
  disputeResolution: {
    mechanism: 'arbitration' | 'mediation' | 'court' | 'dao_vote';
    arbitrator?: Address;
    rules?: string;
  };
  
  // Finalization
  finalAgreement?: {
    agreementId: Address;
    signedParties: Address[];
    executionDate?: number;
    escrowAccount?: Address;
  };
}

/**
 * Negotiation analytics and insights
 */
export interface INegotiationAnalytics {
  // Progress metrics
  progressScore: number;        // 0-100
  timeToCompletion: number;     // Estimated milliseconds
  stuckPoints: string[];        // Areas of disagreement
  
  // Participant behavior
  participantEngagement: Array<{
    party: Address;
    engagementScore: number;    // 0-100
    responseTime: number;       // Average response time
    constructiveness: number;   // 0-100 based on proposal quality
  }>;
  
  // Deal dynamics
  priceMovement: Array<{
    timestamp: number;
    proposedPrice: bigint;
    proposer: Address;
  }>;
  termsEvolution: Array<{
    timestamp: number;
    changedTerms: string[];
    complexity: number;         // 0-100
  }>;
  
  // Market context
  marketComparison: {
    similarDeals: number;
    averageValue: bigint;
    averageNegotiationTime: number;
    successRate: number;        // Percentage
  };
  
  // Predictions and recommendations
  successProbability: number;   // 0-100
  recommendedActions: Array<{
    party: Address;
    action: string;
    priority: 'low' | 'medium' | 'high';
    reasoning: string;
  }>;
  riskFactors: Array<{
    type: 'timeline' | 'price' | 'terms' | 'parties';
    severity: 'low' | 'medium' | 'high';
    description: string;
    mitigation: string;
  }>;
}

/**
 * Search and filtering for bulk deals
 */
export interface IBulkDealFilters {
  // Deal characteristics
  dealTypes?: BulkDealType[];
  statuses?: NegotiationStatus[];
  valueRange?: { min: bigint; max: bigint };
  categories?: string[];
  
  // Participation
  includeParty?: Address;
  excludeParty?: Address;
  minParticipants?: number;
  maxParticipants?: number;
  roles?: PartyRole[];
  
  // Timing
  createdAfter?: number;
  createdBefore?: number;
  deadlineBefore?: number;
  isExpiringSoon?: boolean;
  
  // Complexity and scope
  minItems?: number;
  hasArbitration?: boolean;
  isInternational?: boolean;
  
  // Sorting
  sortBy?: 'created' | 'value' | 'deadline' | 'progress' | 'participants';
  sortOrder?: 'asc' | 'desc';
}

/**
 * Bulk Deal Negotiations Service
 */
export class BulkDealsService {
  constructor(
    private readonly rpc: Rpc<SolanaRpcApi>,
    private readonly _programId: Address,
    private readonly commitment: Commitment = 'confirmed'
  ) {}

  /**
   * Create a new bulk deal negotiation
   */
  async createNegotiation(
    initiator: KeyPairSigner,
    config: {
      dealType: BulkDealType;
      title: string;
      description: string;
      estimatedValue: bigint;
      invitedParties?: Address[];
      deadline?: number;
      terms: Partial<INegotiationTerms>;
      items: IBulkDealNegotiation['finalAgreement'] extends { agreementId: Address } ? 
        INegotiationProposal['items'] : INegotiationProposal['items'];
    }
  ): Promise<{
    negotiationId: Address;
    signature: string;
  }> {
    try {
      console.log(`🤝 Creating ${config.dealType} bulk deal negotiation: ${config.title}`);

      // Validate configuration
      this.validateNegotiationConfig(config);

      // Generate negotiation ID
      const negotiationId = `negotiation_${Date.now()}_${Math.random().toString(36).substr(2, 9)}` as Address;

      // In a real implementation, this would call createNegotiation smart contract instruction
      const mockInstruction = {
        programAddress: this._programId,
        accounts: [
          { address: negotiationId, role: 'writable' as const },
          { address: initiator.address, role: 'writable_signer' as const },
        ],
        data: new Uint8Array([1, 2, 3]) // Mock instruction data
      };

      const sendTransactionFactory = sendAndConfirmTransactionFactory('https://api.devnet.solana.com');
      const result = await sendTransactionFactory([mockInstruction], [initiator]);
      const signature = result.signature;

      console.log('✅ Bulk deal negotiation created:', { negotiationId, signature });
      return { negotiationId, signature };
    } catch (error) {
      throw new Error(`Negotiation creation failed: ${String(error)}`);
    }
  }

  /**
   * Join an existing negotiation
   */
  async joinNegotiation(
    participant: KeyPairSigner,
    negotiationId: Address,
    role: PartyRole,
    organizationInfo?: {
      name: string;
      organization?: string;
      credentials?: Record<string, any>;
    }
  ): Promise<{
    signature: string;
    partyId: Address;
  }> {
    try {
      console.log(`👥 Joining negotiation ${negotiationId} as ${role}`);

      // Get current negotiation state
      const negotiation = await this.getNegotiation(negotiationId);
      if (!negotiation) {
        throw new Error('Negotiation not found');
      }

      // Validate join request
      this.validateJoinRequest(negotiation, participant.address, role);

      const partyId = `party_${Date.now()}_${participant.address.slice(0, 8)}` as Address;

      // In a real implementation, this would call joinNegotiation instruction
      const mockInstruction = {
        programAddress: this._programId,
        accounts: [
          { address: negotiationId, role: 'writable' as const },
          { address: participant.address, role: 'writable_signer' as const },
        ],
        data: new Uint8Array([2, 3, 4]) // Mock instruction data
      };

      const sendTransactionFactory = sendAndConfirmTransactionFactory('https://api.devnet.solana.com');
      const result = await sendTransactionFactory([mockInstruction], [participant]);
      const signature = result.signature;

      console.log('✅ Joined negotiation:', { partyId, signature });
      return { signature, partyId };
    } catch (error) {
      throw new Error(`Failed to join negotiation: ${String(error)}`);
    }
  }

  /**
   * Submit a proposal or counter-proposal
   */
  async submitProposal(
    proposer: KeyPairSigner,
    negotiationId: Address,
    proposal: {
      title: string;
      description: string;
      terms: Partial<INegotiationTerms>;
      items: INegotiationProposal['items'];
      votingDeadline: number;
      isCounterProposal?: boolean;
      parentProposalId?: Address;
      justification?: string;
    }
  ): Promise<{
    proposalId: Address;
    signature: string;
    version: number;
  }> {
    try {
      console.log(`📝 Submitting proposal for negotiation: ${negotiationId}`);

      const negotiation = await this.getNegotiation(negotiationId);
      if (!negotiation) {
        throw new Error('Negotiation not found');
      }

      // Validate proposer has authority
      this.validateProposalAuthority(negotiation, proposer.address);

      const proposalId = `proposal_${Date.now()}_${Math.random().toString(36).substr(2, 9)}` as Address;
      const version = negotiation.proposals.length + 1;

      // In a real implementation, this would call submitProposal instruction
      const mockInstruction = {
        programAddress: this._programId,
        accounts: [
          { address: proposalId, role: 'writable' as const },
          { address: negotiationId, role: 'writable' as const },
          { address: proposer.address, role: 'writable_signer' as const },
        ],
        data: new Uint8Array([3, 4, 5]) // Mock instruction data
      };

      const sendTransactionFactory = sendAndConfirmTransactionFactory('https://api.devnet.solana.com');
      const result = await sendTransactionFactory([mockInstruction], [proposer]);
      const signature = result.signature;

      console.log('✅ Proposal submitted:', { proposalId, signature, version });
      return { proposalId, signature, version };
    } catch (error) {
      throw new Error(`Proposal submission failed: ${String(error)}`);
    }
  }

  /**
   * Vote on a proposal
   */
  async voteOnProposal(
    voter: KeyPairSigner,
    proposalId: Address,
    vote: 'accept' | 'reject' | 'abstain',
    comments?: string,
    suggestedChanges?: string[]
  ): Promise<{
    signature: string;
    votingComplete: boolean;
    consensusReached: boolean;
  }> {
    try {
      console.log(`🗳️ Voting ${vote} on proposal: ${proposalId}`);

      // In a real implementation, this would validate voting rights and record vote
      const mockInstruction = {
        programAddress: this._programId,
        accounts: [
          { address: proposalId, role: 'writable' as const },
          { address: voter.address, role: 'writable_signer' as const },
        ],
        data: new Uint8Array([4, 5, 6]) // Mock instruction data
      };

      const sendTransactionFactory = sendAndConfirmTransactionFactory('https://api.devnet.solana.com');
      const result = await sendTransactionFactory([mockInstruction], [voter]);
      const signature = result.signature;

      // Simulate voting results
      const votingComplete = Math.random() > 0.3;
      const consensusReached = votingComplete && Math.random() > 0.4;

      console.log('✅ Vote recorded:', { signature, votingComplete, consensusReached });
      return { signature, votingComplete, consensusReached };
    } catch (error) {
      throw new Error(`Voting failed: ${String(error)}`);
    }
  }

  /**
   * Finalize agreement when consensus is reached
   */
  async finalizeAgreement(
    executor: KeyPairSigner,
    negotiationId: Address,
    finalProposalId: Address,
    escrowAmount?: bigint
  ): Promise<{
    agreementId: Address;
    signature: string;
    escrowAccount?: Address;
  }> {
    try {
      console.log(`📋 Finalizing agreement for negotiation: ${negotiationId}`);

      const negotiation = await this.getNegotiation(negotiationId);
      if (!negotiation) {
        throw new Error('Negotiation not found');
      }

      if (negotiation.status !== 'approved') {
        throw new Error('Agreement not ready for finalization');
      }

      const agreementId = `agreement_${Date.now()}_${Math.random().toString(36).substr(2, 9)}` as Address;
      const escrowAccount = escrowAmount ? `escrow_${Date.now()}` as Address : undefined;

      // In a real implementation, this would call finalizeAgreement instruction
      const mockInstruction = {
        programAddress: this._programId,
        accounts: [
          { address: agreementId, role: 'writable' as const },
          { address: negotiationId, role: 'writable' as const },
          { address: executor.address, role: 'writable_signer' as const },
        ],
        data: new Uint8Array([5, 6, 7]) // Mock instruction data
      };

      const sendTransactionFactory = sendAndConfirmTransactionFactory('https://api.devnet.solana.com');
      const result = await sendTransactionFactory([mockInstruction], [executor]);
      const signature = result.signature;

      console.log('✅ Agreement finalized:', { agreementId, signature, escrowAccount });
      return { agreementId, signature, escrowAccount };
    } catch (error) {
      throw new Error(`Agreement finalization failed: ${String(error)}`);
    }
  }

  /**
   * Get detailed negotiation information
   */
  async getNegotiation(negotiationId: Address): Promise<IBulkDealNegotiation | null> {
    try {
      // In a real implementation, this would fetch from blockchain
      const accountInfo = await this.rpc
        .getAccountInfo(negotiationId, {
          commitment: this.commitment,
          encoding: 'base64',
        })
        .send();

      if (!accountInfo.value) {
        return null;
      }

      // Simulate negotiation data parsing
      return this.generateMockNegotiation(negotiationId);
    } catch (error) {
      console.error('Failed to get negotiation:', error);
      return null;
    }
  }

  /**
   * Search and filter bulk deal negotiations
   */
  async searchNegotiations(
    filters: IBulkDealFilters = {},
    limit: number = 50,
    offset: number = 0
  ): Promise<{
    negotiations: IBulkDealNegotiation[];
    totalCount: number;
    hasMore: boolean;
    searchMetadata: {
      filters: IBulkDealFilters;
      executionTime: number;
      qualityScore: number;
    };
  }> {
    const startTime = Date.now();
    
    try {
      console.log('🔍 Searching bulk deal negotiations with filters:', filters);

      // Get all negotiations (in production, this would use efficient indexing)
      const allNegotiations = await this.getAllNegotiations(1000);
      
      // Apply filters
      let filteredNegotiations = this.applyNegotiationFilters(allNegotiations, filters);
      
      // Apply sorting
      filteredNegotiations = this.sortNegotiations(filteredNegotiations, filters);
      
      // Apply pagination
      const totalCount = filteredNegotiations.length;
      const paginatedNegotiations = filteredNegotiations.slice(offset, offset + limit);
      
      const executionTime = Date.now() - startTime;
      const qualityScore = this.calculateSearchQuality(paginatedNegotiations, filters);

      return {
        negotiations: paginatedNegotiations,
        totalCount,
        hasMore: offset + limit < totalCount,
        searchMetadata: {
          filters,
          executionTime,
          qualityScore,
        },
      };
    } catch (error) {
      throw new Error(`Negotiation search failed: ${String(error)}`);
    }
  }

  /**
   * Get active negotiations for a specific party
   */
  async getPartyNegotiations(
    partyAddress: Address,
    activeOnly: boolean = true
  ): Promise<IBulkDealNegotiation[]> {
    try {
      console.log(`👤 Getting negotiations for party: ${partyAddress}`);

      const filters: IBulkDealFilters = {
        includeParty: partyAddress,
        statuses: activeOnly ? ['proposed', 'under_review', 'negotiating', 'pending_approval'] : undefined,
        sortBy: 'created',
        sortOrder: 'desc',
      };

      const result = await this.searchNegotiations(filters, 100);
      return result.negotiations;
    } catch (error) {
      throw new Error(`Failed to get party negotiations: ${String(error)}`);
    }
  }

  /**
   * Get comprehensive negotiation analytics
   */
  async getNegotiationAnalytics(negotiationId: Address): Promise<INegotiationAnalytics> {
    try {
      console.log(`📊 Generating analytics for negotiation: ${negotiationId}`);

      const negotiation = await this.getNegotiation(negotiationId);
      if (!negotiation) {
        throw new Error('Negotiation not found');
      }

      // Calculate progress metrics
      const progressScore = this.calculateProgressScore(negotiation);
      const timeToCompletion = this.estimateTimeToCompletion(negotiation);
      const stuckPoints = this.identifyStuckPoints(negotiation);

      // Analyze participant behavior
      const participantEngagement = this.analyzeParticipantEngagement(negotiation);

      // Track deal dynamics
      const priceMovement = this.analyzePriceMovement(negotiation);
      const termsEvolution = this.analyzeTermsEvolution(negotiation);

      // Generate market context
      const marketComparison = await this.getMarketComparison(negotiation);

      // Make predictions
      const successProbability = this.predictSuccessProbability(negotiation);
      const recommendedActions = this.generateActionRecommendations(negotiation);
      const riskFactors = this.assessRiskFactors(negotiation);

      return {
        progressScore,
        timeToCompletion,
        stuckPoints,
        participantEngagement,
        priceMovement,
        termsEvolution,
        marketComparison,
        successProbability,
        recommendedActions,
        riskFactors,
      };
    } catch (error) {
      throw new Error(`Analytics generation failed: ${String(error)}`);
    }
  }

  /**
   * Get trending bulk deals
   */
  async getTrendingDeals(
    category?: string,
    limit: number = 20
  ): Promise<IBulkDealNegotiation[]> {
    try {
      console.log(`🔥 Getting trending bulk deals for category: ${category || 'all'}`);

      const filters: IBulkDealFilters = {
        statuses: ['proposed', 'negotiating', 'pending_approval'],
        categories: category ? [category] : undefined,
        sortBy: 'participants',
        sortOrder: 'desc',
      };

      const result = await this.searchNegotiations(filters, limit);
      return result.negotiations.filter(negotiation => 
        this.calculateTrendingScore(negotiation) > 70
      );
    } catch (error) {
      throw new Error(`Trending deals retrieval failed: ${String(error)}`);
    }
  }

  /**
   * Private helper methods
   */

  private validateNegotiationConfig(config: any): void {
    if (!config.title || config.title.length < 5) {
      throw new Error('Negotiation title must be at least 5 characters');
    }

    if (!config.dealType) {
      throw new Error('Deal type is required');
    }

    if (config.estimatedValue <= 0n) {
      throw new Error('Estimated value must be positive');
    }

    if (config.deadline && config.deadline <= Date.now()) {
      throw new Error('Deadline must be in the future');
    }

    if (!config.items || config.items.length === 0) {
      throw new Error('At least one item must be included in the deal');
    }
  }

  private validateJoinRequest(
    negotiation: IBulkDealNegotiation,
    participantAddress: Address,
    role: PartyRole
  ): void {
    if (negotiation.status === 'executed' || negotiation.status === 'expired') {
      throw new Error('Cannot join completed or expired negotiation');
    }

    if (negotiation.invitationOnly) {
      // Check if participant is invited (simplified check)
      const isInvited = negotiation.parties.some(party => party.address === participantAddress);
      if (!isInvited) {
        throw new Error('Negotiation is invitation-only');
      }
    }

    if (negotiation.maxParticipants && negotiation.parties.length >= negotiation.maxParticipants) {
      throw new Error('Maximum participants reached');
    }

    const existingParty = negotiation.parties.find(party => party.address === participantAddress);
    if (existingParty) {
      throw new Error('Party already participating in negotiation');
    }
  }

  private validateProposalAuthority(
    negotiation: IBulkDealNegotiation,
    proposerAddress: Address
  ): void {
    const party = negotiation.parties.find(p => p.address === proposerAddress);
    if (!party) {
      throw new Error('Proposer is not a participant in this negotiation');
    }

    if (!party.decisionAuthority.canModifyTerms) {
      throw new Error('Party does not have authority to modify terms');
    }

    if (negotiation.status !== 'proposed' && negotiation.status !== 'negotiating') {
      throw new Error('Proposals cannot be submitted in current negotiation phase');
    }
  }

  private generateMockNegotiation(negotiationId: Address): IBulkDealNegotiation {
    const dealTypes: BulkDealType[] = ['agent_bundle', 'service_package', 'enterprise_license', 'volume_discount'];
    const statuses: NegotiationStatus[] = ['proposed', 'negotiating', 'pending_approval', 'under_review'];
    
    const randomDealType = dealTypes[Math.floor(Math.random() * dealTypes.length)];
    const randomStatus = statuses[Math.floor(Math.random() * statuses.length)];
    
    return {
      negotiationId,
      dealType: randomDealType,
      initiator: `initiator_${Date.now()}` as Address,
      title: `${randomDealType} Bulk Deal`,
      description: `Large-scale ${randomDealType} negotiation for enterprise clients`,
      status: randomStatus,
      currentPhase: 'bargaining',
      createdAt: Date.now() - Math.random() * 86400000 * 7, // Within last week
      lastActivity: Date.now() - Math.random() * 3600000, // Within last hour
      deadline: Date.now() + Math.random() * 86400000 * 30, // Next 30 days
      parties: this.generateMockParties(),
      maxParticipants: Math.floor(Math.random() * 10) + 3,
      invitationOnly: Math.random() > 0.6,
      proposals: [],
      negotiationHistory: [],
      estimatedValue: BigInt(Math.floor(Math.random() * 50000000000) + 1000000000), // 1-50 SOL
      totalItems: Math.floor(Math.random() * 50) + 1,
      categories: ['AI Services', 'Enterprise Software', 'Data Processing'],
      communicationChannels: [
        { type: 'on_chain_messages', enabled: true },
        { type: 'private_channel', enabled: Math.random() > 0.5 },
      ],
      jurisdiction: 'International',
      disputeResolution: {
        mechanism: 'arbitration',
        rules: 'Standard arbitration rules',
      },
    };
  }

  private generateMockParties(): INegotiationParty[] {
    const roles: PartyRole[] = ['initiator', 'primary_seller', 'buyer', 'intermediary'];
    const partyCount = Math.floor(Math.random() * 6) + 2; // 2-7 parties
    
    return Array.from({ length: partyCount }, (_, i) => ({
      address: `party_${i + 1}_${Date.now()}` as Address,
      role: roles[i % roles.length],
      name: `Party ${i + 1}`,
      organization: Math.random() > 0.5 ? `Organization ${i + 1}` : undefined,
      reputation: Math.floor(Math.random() * 100) + 1,
      hasJoined: Math.random() > 0.2,
      lastActive: Date.now() - Math.random() * 3600000,
      approvalStatus: 'pending',
      votingWeight: Math.floor(Math.random() * 100) + 1,
      decisionAuthority: {
        canApprove: Math.random() > 0.3,
        canVeto: Math.random() > 0.8,
        canModifyTerms: Math.random() > 0.5,
      },
      preferredCommunication: 'hybrid',
      responseTimeTarget: Math.floor(Math.random() * 3600000) + 300000, // 5 minutes to 1 hour
    }));
  }

  private async getAllNegotiations(limit: number): Promise<IBulkDealNegotiation[]> {
    // Simulate getting negotiations from blockchain
    return Array.from({ length: Math.min(limit, 25) }, (_, i) => 
      this.generateMockNegotiation(`negotiation_${i + 1}_${Date.now()}` as Address)
    );
  }

  private applyNegotiationFilters(
    negotiations: IBulkDealNegotiation[],
    filters: IBulkDealFilters
  ): IBulkDealNegotiation[] {
    return negotiations.filter(negotiation => {
      // Deal type filtering
      if (filters.dealTypes && !filters.dealTypes.includes(negotiation.dealType)) return false;
      
      // Status filtering
      if (filters.statuses && !filters.statuses.includes(negotiation.status)) return false;
      
      // Value range filtering
      if (filters.valueRange) {
        if (filters.valueRange.min && negotiation.estimatedValue < filters.valueRange.min) return false;
        if (filters.valueRange.max && negotiation.estimatedValue > filters.valueRange.max) return false;
      }
      
      // Category filtering
      if (filters.categories && !filters.categories.some(cat => negotiation.categories.includes(cat))) return false;
      
      // Party filtering
      if (filters.includeParty && !negotiation.parties.some(p => p.address === filters.includeParty)) return false;
      if (filters.excludeParty && negotiation.parties.some(p => p.address === filters.excludeParty)) return false;
      
      // Participant count filtering
      if (filters.minParticipants && negotiation.parties.length < filters.minParticipants) return false;
      if (filters.maxParticipants && negotiation.parties.length > filters.maxParticipants) return false;
      
      // Timing filtering
      if (filters.createdAfter && negotiation.createdAt < filters.createdAfter) return false;
      if (filters.createdBefore && negotiation.createdAt > filters.createdBefore) return false;
      if (filters.deadlineBefore && (!negotiation.deadline || negotiation.deadline > filters.deadlineBefore)) return false;
      
      // Items filtering
      if (filters.minItems && negotiation.totalItems < filters.minItems) return false;

      return true;
    });
  }

  private sortNegotiations(
    negotiations: IBulkDealNegotiation[],
    filters: IBulkDealFilters
  ): IBulkDealNegotiation[] {
    const sortedNegotiations = [...negotiations];

    switch (filters.sortBy) {
      case 'created':
        sortedNegotiations.sort((a, b) => b.createdAt - a.createdAt);
        break;
      case 'value':
        sortedNegotiations.sort((a, b) => Number(b.estimatedValue - a.estimatedValue));
        break;
      case 'deadline':
        sortedNegotiations.sort((a, b) => (a.deadline || 0) - (b.deadline || 0));
        break;
      case 'progress':
        sortedNegotiations.sort((a, b) => this.calculateProgressScore(b) - this.calculateProgressScore(a));
        break;
      case 'participants':
        sortedNegotiations.sort((a, b) => b.parties.length - a.parties.length);
        break;
      default:
        sortedNegotiations.sort((a, b) => b.lastActivity - a.lastActivity);
    }

    if (filters.sortOrder === 'asc') {
      sortedNegotiations.reverse();
    }

    return sortedNegotiations;
  }

  private calculateSearchQuality(
    negotiations: IBulkDealNegotiation[],
    filters: IBulkDealFilters
  ): number {
    if (negotiations.length === 0) return 0;
    
    const diversityScore = Math.min(negotiations.length / 15, 1) * 30;
    const relevanceScore = negotiations.length > 0 ? 70 : 0;
    
    return Math.round(diversityScore + relevanceScore);
  }

  private calculateProgressScore(negotiation: IBulkDealNegotiation): number {
    const statusScores = {
      'draft': 10,
      'proposed': 25,
      'under_review': 40,
      'counter_proposed': 45,
      'negotiating': 60,
      'pending_approval': 80,
      'approved': 95,
      'rejected': 0,
      'expired': 0,
      'executed': 100,
      'disputed': 30,
    };

    const baseScore = statusScores[negotiation.status] || 0;
    const participationBonus = Math.min((negotiation.parties.length / 5) * 10, 15);
    const activityBonus = negotiation.lastActivity > Date.now() - 86400000 ? 10 : 0; // Active in last day

    return Math.min(baseScore + participationBonus + activityBonus, 100);
  }

  private estimateTimeToCompletion(negotiation: IBulkDealNegotiation): number {
    // Simple estimation based on current phase and complexity
    const baseTime = 7 * 24 * 60 * 60 * 1000; // 7 days
    const complexityFactor = Math.min(negotiation.totalItems / 10, 2);
    const participantFactor = Math.min(negotiation.parties.length / 5, 1.5);
    
    return Math.round(baseTime * complexityFactor * participantFactor);
  }

  private identifyStuckPoints(negotiation: IBulkDealNegotiation): string[] {
    const stuckPoints: string[] = [];
    
    if (negotiation.lastActivity < Date.now() - 48 * 60 * 60 * 1000) {
      stuckPoints.push('No recent activity for over 48 hours');
    }
    
    if (negotiation.estimatedValue > BigInt(10000000000)) {
      stuckPoints.push('High deal value may require additional approvals');
    }
    
    if (negotiation.parties.length > 5) {
      stuckPoints.push('Large number of participants may slow consensus');
    }
    
    return stuckPoints;
  }

  private analyzeParticipantEngagement(negotiation: IBulkDealNegotiation): INegotiationAnalytics['participantEngagement'] {
    return negotiation.parties.map(party => ({
      party: party.address,
      engagementScore: Math.floor(Math.random() * 100) + 1,
      responseTime: Math.floor(Math.random() * 3600000) + 300000,
      constructiveness: Math.floor(Math.random() * 100) + 1,
    }));
  }

  private analyzePriceMovement(negotiation: IBulkDealNegotiation): INegotiationAnalytics['priceMovement'] {
    const movements = Math.floor(Math.random() * 5) + 1;
    return Array.from({ length: movements }, (_, i) => ({
      timestamp: negotiation.createdAt + (i * 86400000),
      proposedPrice: negotiation.estimatedValue + BigInt(Math.floor(Math.random() * 2000000000) - 1000000000),
      proposer: negotiation.parties[i % negotiation.parties.length].address,
    }));
  }

  private analyzeTermsEvolution(negotiation: IBulkDealNegotiation): INegotiationAnalytics['termsEvolution'] {
    const changes = Math.floor(Math.random() * 3) + 1;
    return Array.from({ length: changes }, (_, i) => ({
      timestamp: negotiation.createdAt + (i * 172800000), // Every 2 days
      changedTerms: ['pricing', 'delivery_schedule', 'warranty_terms'].slice(0, Math.floor(Math.random() * 3) + 1),
      complexity: Math.floor(Math.random() * 100) + 1,
    }));
  }

  private async getMarketComparison(negotiation: IBulkDealNegotiation): Promise<INegotiationAnalytics['marketComparison']> {
    // Simulate market comparison
    return {
      similarDeals: Math.floor(Math.random() * 20) + 5,
      averageValue: BigInt(Math.floor(Math.random() * 20000000000) + 5000000000),
      averageNegotiationTime: Math.floor(Math.random() * 30) + 7, // 7-37 days
      successRate: Math.floor(Math.random() * 40) + 60, // 60-100%
    };
  }

  private predictSuccessProbability(negotiation: IBulkDealNegotiation): number {
    const progressScore = this.calculateProgressScore(negotiation);
    const participationFactor = Math.min(negotiation.parties.filter(p => p.hasJoined).length / negotiation.parties.length, 1) * 20;
    const timelineFactor = negotiation.deadline && negotiation.deadline > Date.now() ? 20 : 10;
    
    return Math.min(Math.round((progressScore * 0.6) + participationFactor + timelineFactor), 100);
  }

  private generateActionRecommendations(negotiation: IBulkDealNegotiation): INegotiationAnalytics['recommendedActions'] {
    const recommendations: INegotiationAnalytics['recommendedActions'] = [];
    
    negotiation.parties.forEach(party => {
      if (!party.hasJoined) {
        recommendations.push({
          party: party.address,
          action: 'Join the negotiation to participate in decision making',
          priority: 'high',
          reasoning: 'Your participation is required for the negotiation to proceed',
        });
      }
      
      if (party.lastActive < Date.now() - 24 * 60 * 60 * 1000) {
        recommendations.push({
          party: party.address,
          action: 'Respond to latest proposals',
          priority: 'medium',
          reasoning: 'Lack of response may delay the negotiation process',
        });
      }
    });
    
    return recommendations;
  }

  private assessRiskFactors(negotiation: IBulkDealNegotiation): INegotiationAnalytics['riskFactors'] {
    const risks: INegotiationAnalytics['riskFactors'] = [];
    
    if (negotiation.deadline && negotiation.deadline - Date.now() < 7 * 24 * 60 * 60 * 1000) {
      risks.push({
        type: 'timeline',
        severity: 'high',
        description: 'Negotiation deadline approaching within 7 days',
        mitigation: 'Expedite decision making and reduce scope if necessary',
      });
    }
    
    if (negotiation.estimatedValue > BigInt(25000000000)) {
      risks.push({
        type: 'price',
        severity: 'medium',
        description: 'High-value deal may require additional due diligence',
        mitigation: 'Ensure proper legal review and escrow arrangements',
      });
    }
    
    if (negotiation.parties.length > 7) {
      risks.push({
        type: 'parties',
        severity: 'medium',
        description: 'Large number of parties may complicate consensus',
        mitigation: 'Consider forming smaller decision-making committees',
      });
    }
    
    return risks;
  }

  private calculateTrendingScore(negotiation: IBulkDealNegotiation): number {
    const valueFactor = Math.min(Number(negotiation.estimatedValue) / 10000000000, 1) * 30; // Up to 30 points for high value
    const participantFactor = Math.min(negotiation.parties.length / 8, 1) * 25; // Up to 25 points for many participants
    const activityFactor = negotiation.lastActivity > Date.now() - 24 * 60 * 60 * 1000 ? 25 : 0; // 25 points for recent activity
    const progressFactor = Math.min(this.calculateProgressScore(negotiation) / 2, 20); // Up to 20 points for progress
    
    return valueFactor + participantFactor + activityFactor + progressFactor;
  }
}