/**
 * Modern Agent Replication Service for Web3.js v2 (2025)
 * Follows Rust SDK architecture patterns
 */

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';

/**
 * Agent customization options
 */
export interface IAgentCustomization {
  name?: string;
  description?: string;
  capabilities?: number[];
  metadata?: Record<string, unknown>;
}

/**
 * Replication configuration
 */
export interface IReplicationConfig {
  commitment?: Commitment;
  skipPreflight?: boolean;
  maxRetries?: number;
}

/**
 * Replication template data
 */
export interface IReplicationTemplate {
  id: string;
  sourceAgent: Address;
  creator: Address;
  genomeHash: string;
  baseCapabilities: number[];
  replicationFee: bigint;
  maxReplications: number;
  currentReplications: number;
  isActive: boolean;
  createdAt: number;
}

/**
 * Replication template result
 */
export interface IReplicationTemplateResult {
  signature: string;
  templatePda: Address;
  templateId: string;
}

/**
 * Agent replication result
 */
export interface IAgentReplicationResult {
  signature: string;
  replicatedAgent: Address;
  agentId: string;
}

/**
 * Replication record
 */
export interface IReplicationRecord {
  id: string;
  templateId: string;
  originalAgent: Address;
  replicatedAgent: Address;
  buyer: Address;
  customizations: IAgentCustomization;
  replicationFee: bigint;
  timestamp: number;
}

/**
 * Modern Agent Replication Service using Web3.js v2 patterns
 */
export class AgentReplicationService {
  constructor(
    private readonly rpc: Rpc<SolanaRpcApi>,
    private readonly programId: Address,
    private readonly commitment: Commitment = 'confirmed'
  ) {}

  /**
   * Create agent replication template on-chain
   */
  async createReplicationTemplate(
    _creator: KeyPairSigner,
    templateData: {
      sourceAgent: Address;
      genomeHash: string;
      baseCapabilities: number[];
      replicationFee: bigint;
      maxReplications: number;
    },
    _config: IReplicationConfig = {}
  ): Promise<IReplicationTemplateResult> {
    console.log(
      'Creating replication template for agent:',
      templateData.sourceAgent
    );
    
    try {
      const templatePda = await this.getReplicationTemplatePda(
        templateData.sourceAgent,
        templateData.genomeHash
      );

      const templateId = `template_${Date.now()}_${Math.random().toString(36).substr(2, 8)}`;

      // Simulate transaction
      await new Promise(resolve => setTimeout(resolve, 1000));

      const signature = `sig_template_${Date.now()}`;

      console.log('✅ Replication template created:', signature);

      return {
        signature,
        templatePda,
        templateId,
      };
    } catch (error) {
      console.error('❌ Failed to create replication template:', error);
      throw new Error(
        `Template creation failed: ${error instanceof Error ? error.message : 'Unknown error'}`
      );
    }
  }

  /**
   * Replicate agent from template with customizations
   */
  async replicateAgent(
    buyer: KeyPairSigner,
    templatePda: Address,
    customizations: IAgentCustomization = {},
    _config: IReplicationConfig = {}
  ): Promise<IAgentReplicationResult> {
    console.log('Replicating agent from template:', templatePda);
    if (customizations && Object.keys(customizations).length > 0) {
      console.log('Customizations:', customizations);
    }
    
    try {
      const template = await this.getReplicationTemplate(templatePda);
      if (!template) {
        throw new Error('Replication template not found');
      }

      if (!template.isActive) {
        throw new Error('Replication template is not active');
      }

      if (template.currentReplications >= template.maxReplications) {
        throw new Error('Maximum replications reached for this template');
      }

      const agentId = `replicated_${Date.now()}_${Math.random().toString(36).substr(2, 8)}`;
      const replicatedAgent = await this.getReplicatedAgentPda(
        buyer.address,
        agentId
      );

      // Simulate transaction
      await new Promise(resolve => setTimeout(resolve, 1500));

      const signature = `sig_replicate_${Date.now()}`;

      console.log('✅ Agent replicated successfully:', signature);

      return {
        signature,
        replicatedAgent,
        agentId,
      };
    } catch (error) {
      console.error('❌ Failed to replicate agent:', error);
      throw new Error(
        `Agent replication failed: ${error instanceof Error ? error.message : 'Unknown error'}`
      );
    }
  }

  /**
   * Get replication template by PDA
   */
  async getReplicationTemplate(
    templatePda: Address
  ): Promise<IReplicationTemplate | null> {
    try {
      const accountInfo = await this.rpc
        .getAccountInfo(templatePda, {
          commitment: this.commitment,
          encoding: 'base64',
        })
        .send();

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

      let data: string | Uint8Array;
      if (
        Array.isArray(accountInfo.value.data) &&
        accountInfo.value.data[1] === 'base64'
      ) {
        data = Buffer.from(accountInfo.value.data[0], 'base64');
      } else if (
        typeof accountInfo.value.data === 'string' ||
        accountInfo.value.data instanceof Uint8Array
      ) {
        data = accountInfo.value.data;
      } else {
        throw new Error('Unknown account data format');
      }
      return this.parseReplicationTemplate(data);
    } catch (error) {
      console.error('❌ Failed to get replication template:', error);
      return null;
    }
  }

  /**
   * List replication templates by creator
   */
  async listCreatorTemplates(
    creator: Address
  ): Promise<IReplicationTemplate[]> {
    try {
      const accountsResult = await this.rpc
        .getProgramAccounts(this.programId, {
          commitment: this.commitment,
          filters: [
            {
              memcmp: {
                offset: BigInt(8),
                bytes: creator as any, // TODO: Use correct branded type
                encoding: 'base58',
              },
            },
          ],
        })
        .send();

      // Type for accountsResult.value is unknown, so use type guard
      const accounts = (
        accountsResult as {
          value?: Array<{ account: { data: string | Uint8Array } }>;
        }
      ).value ?? [];
      return accounts.map((account) => this.parseReplicationTemplate(account.account.data));
    } catch (error) {
      console.error('❌ Failed to list creator templates:', error);
      return [];
    }
  }

  /**
   * Get replication history for an agent
   */
  async getReplicationHistory(agentPda: Address): Promise<IReplicationRecord[]> {
    try {
      // This would query for replication records
      // For now, return mock data
      return [
        {
          id: 'record_1',
          templateId: 'template_1',
          originalAgent: agentPda,
          replicatedAgent: 'replicated_agent_1' as Address,
          buyer: 'buyer_address' as Address,
          customizations: { name: 'Replicated Agent' },
          replicationFee: BigInt(1000000),
          timestamp: Date.now() - 86400000, // 24 hours ago
        },
      ];
    } catch (error) {
      console.error('❌ Failed to get replication history:', error);
      return [];
    }
  }

  /**
   * Calculate replication template PDA
   */
  private async getReplicationTemplatePda(
    sourceAgent: Address,
    genomeHash: string
  ): Promise<Address> {
    return `${sourceAgent}_${genomeHash}_template_pda` as Address;
  }

  /**
   * Calculate replicated agent PDA
   */
  private async getReplicatedAgentPda(buyer: Address, agentId: string): Promise<Address> {
    return `${buyer}_${agentId}_replicated_pda` as Address;
  }

  /**
   * Parse replication template account data
   */
  private parseReplicationTemplate(_data: string | Uint8Array): IReplicationTemplate {
    return {
      id: 'mock_template_id',
      sourceAgent: 'mock_source_agent' as Address,
      creator: 'mock_creator' as Address,
      genomeHash: 'mock_genome_hash',
      baseCapabilities: [1, 2, 3],
      replicationFee: BigInt(1000000),
      maxReplications: 10,
      currentReplications: 2,
      isActive: true,
      createdAt: Date.now(),
    };
  }
}