import lettaApi from '../api/lettaApi';
import type { LettaAgent } from '../types/letta';
import { getDefaultMemoryBlocks } from '../constants/memoryBlocks';
import { CO_SYSTEM_PROMPT } from '../constants/systemPrompt';
import { Letta } from "@letta-ai/letta-client";

const CO_TAG = 'co-app';

/**
 * Create Co - a comprehensive knowledge management assistant
 */
export async function createCoAgent(userName: string): Promise<LettaAgent> {
  try {
    const agent = await lettaApi.createAgent({
      name: 'Co',
      description: 'Co - A comprehensive knowledge management assistant designed to learn, adapt, and think alongside the user',
      // agentType: Letta.AgentType.LettaV1Agent, // currently pending sleeptime fixes
      // agentType: Letta.AgentType.MemgptV2Agent,
      model: 'anthropic/claude-haiku-4-5-20251001',
      system: CO_SYSTEM_PROMPT,
      tags: [CO_TAG],
      memoryBlocks: getDefaultMemoryBlocks(),
      // includeBaseTools: false,
      tools: [
        'conversation_search',
        'web_search',
        'fetch_webpage',
        'memory',
      ],
      toolRules: [], // No tool rules
      enableSleeptime: true,
    });

    console.log('Agent created, finding sleeptime agent via shared memory blocks...');

    // Get the first memory block ID - both primary and sleeptime agents share the same blocks
    const blockId = agent.memory?.blocks?.[0]?.id;

    if (!blockId) {
      console.warn('No memory blocks found on agent. Cannot find sleeptime agent.');
      return agent;
    }

    console.log('Using block ID to find agents:', blockId);

    // Get all agents that share this memory block (should be primary + sleeptime)
    const agentsForBlock = await lettaApi.listAgentsForBlock(blockId);
    console.log('Agents sharing this block:', agentsForBlock.map(a => ({ id: a.id, name: a.name })));

    // Find the sleeptime agent (the one that's NOT the primary agent)
    const sleeptimeAgent = agentsForBlock.find(a => a.id !== agent.id);

    if (sleeptimeAgent) {
      console.log('Found sleeptime agent:', sleeptimeAgent.id, sleeptimeAgent.name);

      // Retrieve full primary agent details and store sleeptime agent ID
      const fullAgent = await lettaApi.getAgent(agent.id);
      fullAgent.sleeptime_agent_id = sleeptimeAgent.id;

      // Attach archival memory tools to sleeptime agent
      await ensureSleeptimeTools(fullAgent);

      return fullAgent;
    } else {
      console.warn('No sleeptime agent found sharing memory blocks. Only found:', agentsForBlock.length, 'agent(s)');
      return agent;
    }
  } catch (error) {
    console.error('Error creating Co agent:', error);
    throw error;
  }
}

/**
 * Ensure sleeptime agent has required archival memory tools and co_memory block
 */
export async function ensureSleeptimeTools(agent: LettaAgent): Promise<void> {
  try {
    // Try to get sleeptime agent ID from either the custom property or multi_agent_group
    const sleeptimeAgentId = agent.sleeptime_agent_id || agent.multi_agent_group?.agent_ids?.[0];

    if (!sleeptimeAgentId) {
      console.log('No sleeptime agent found for agent:', agent.id);
      return;
    }

    console.log('Ensuring sleeptime agent has archival tools and co_memory block:', sleeptimeAgentId);

    // Get the sleeptime agent to check its current tools and blocks
    const sleeptimeAgent = await lettaApi.getAgent(sleeptimeAgentId);
    const sleeptimeToolNames = sleeptimeAgent.tools?.map(t => t.name) || [];
    const sleeptimeBlockLabels = sleeptimeAgent.memory?.blocks?.map(b => b.label) || [];

    console.log('Current sleeptime tools:', sleeptimeToolNames);
    console.log('Current sleeptime blocks:', sleeptimeBlockLabels);

    // Attach missing tools
    const requiredTools = ['archival_memory_search', 'archival_memory_insert'];
    for (const toolName of requiredTools) {
      if (!sleeptimeToolNames.includes(toolName)) {
        console.log(`Attaching ${toolName} to sleeptime agent`);
        try {
          await lettaApi.attachToolToAgentByName(sleeptimeAgentId, toolName);
          console.log(`✓ Successfully attached ${toolName}`);
        } catch (error) {
          console.error(`✗ Failed to attach ${toolName}:`, error);
          throw error;
        }
      } else {
        console.log(`✓ ${toolName} already attached`);
      }
    }

    // Ensure co_memory block exists
    if (!sleeptimeBlockLabels.includes('co_memory')) {
      console.log('Creating co_memory block for sleeptime agent');
      try {
        const { CO_MEMORY_BLOCK } = await import('../constants/memoryBlocks');

        // Two-step process: create block, then attach to agent
        const createdBlock = await lettaApi.createBlock({
          label: CO_MEMORY_BLOCK.label,
          value: CO_MEMORY_BLOCK.value,
          description: CO_MEMORY_BLOCK.description,
          limit: CO_MEMORY_BLOCK.limit,
        });

        console.log('✓ Created co_memory block:', createdBlock.id);

        await lettaApi.attachBlockToAgent(sleeptimeAgentId, createdBlock.id!);
        console.log('✓ Successfully attached co_memory block to sleeptime agent');
      } catch (error) {
        console.error('✗ Failed to create/attach co_memory block:', error);
        throw error;
      }
    } else {
      console.log('✓ co_memory block already exists');
    }
  } catch (error) {
    console.error('Error in ensureSleeptimeTools:', error);
    throw error;
  }
}

/**
 * Find or create the Co agent for the logged-in user
 */
export async function findOrCreateCo(userName: string): Promise<LettaAgent> {
  try {
    // Try to find existing Co agent
    const existingAgent = await lettaApi.findAgentByTags([CO_TAG]);

    if (existingAgent) {
      console.log('Found existing Co agent:', existingAgent.id);

      // Retrieve full agent details
      const fullAgent = await lettaApi.getAgent(existingAgent.id);

      // Find sleeptime agent using shared memory blocks (same approach as createCoAgent)
      const blockId = fullAgent.memory?.blocks?.[0]?.id;

      if (blockId) {
        console.log('Using block ID to find sleeptime agent:', blockId);
        const agentsForBlock = await lettaApi.listAgentsForBlock(blockId);
        console.log('Agents sharing this block:', agentsForBlock.map(a => ({ id: a.id, name: a.name })));

        // Find the sleeptime agent (the one that's NOT the primary agent)
        const sleeptimeAgent = agentsForBlock.find(a => a.id !== fullAgent.id);

        if (sleeptimeAgent) {
          fullAgent.sleeptime_agent_id = sleeptimeAgent.id;
          console.log('Found sleeptime agent for existing Co:', sleeptimeAgent.id);
        } else {
          console.warn('No sleeptime agent found sharing memory blocks for existing agent');
        }
      } else {
        console.warn('No memory blocks found on existing agent. Cannot find sleeptime agent.');
      }

      // Ensure sleeptime agent has required tools
      await ensureSleeptimeTools(fullAgent);

      return fullAgent;
    }

    // Create new Co agent
    console.log('Creating new Co agent for user:', userName);
    return await createCoAgent(userName);
  } catch (error) {
    console.error('Error in findOrCreateCo:', error);
    throw error;
  }
}