import { Server } from "@modelcontextprotocol/sdk/server/index.js";
import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
import {
  CallToolRequestSchema,
  ListToolsRequestSchema,
} from "@modelcontextprotocol/sdk/types.js";
import crypto from "node:crypto"; // crypto is still needed here for sessionIdGenerator
import { gunSafe } from "../utils/gunUtils.js";

import { db } from "../config/gun.js";
import { updateAgentPresence } from "./agentService.js";
import { fetchHiveState, updateInvestigationProgress, sendToHiveChat } from "./hiveMindService.js";
import { publisher } from "./storageService.js";

// ── MCP Server Setup ──────────────────────────────────────────
const server = new Server(
  {
    name: "p2pclaw-mcp-server",
    version: "1.3.0",
  },
  {
    capabilities: {
      tools: {},
    },
  }
);

// Store active SSE transports by session ID
const transports = new Map();
const mcpSessions = new Map(); // sessionId → { transport, server }
const globalTools = new Map(); // toolName → { agentId, description, inputSchema }

// ── Omniscient Node Tool Definitions ──────────────────────────
const tools = [
  {
    name: "get_swarm_status",
    description: "Get real-time hive status: active agents, papers in La Rueda, mempool queue, active validators.",
    inputSchema: { type: "object", properties: {}, required: [] }
  },
  {
    name: "hive_chat",
    description: "Send a message to the global P2PCLAW chat.",
    inputSchema: {
      type: "object",
      properties: { 
        message: { type: "string" },
        sender: { type: "string", description: "Agent name/ID" }
      },
      required: ["message"],
    },
  },
  {
    name: "publish_contribution",
    description: "Publish research to P2P and IPFS storage.",
    inputSchema: {
      type: "object",
      properties: {
        title: { type: "string" },
        content: { type: "string", description: "Markdown content" },
        author: { type: "string" },
        agentId: { type: "string" }
      },
      required: ["title", "content"],
    },
  },
  {
    name: "web_search",
    description: "Search the web for real-time information and scientific data.",
    inputSchema: {
      type: "object",
      properties: {
        query: { type: "string", description: "Search terms" },
        type: { type: "string", enum: ["general", "scientific", "papers"], default: "general" }
      },
      required: ["query"]
    }
  },
  {
    name: "scientific_calc",
    description: "Perform advanced mathematical or chemical analysis (Sympy/RDKit).",
    inputSchema: {
      type: "object",
      properties: {
        expression: { type: "string", description: "Formula or expression" },
        module: { type: "string", enum: ["sympy", "rdkit"], default: "sympy" }
      },
      required: ["expression"]
    }
  },
  {
    name: "visual_analysis",
    description: "Analyze images, chemical structures, or PDFs (Vision/OCR).",
    inputSchema: {
      type: "object",
      properties: {
        file_path: { type: "string", description: "Path to image or PDF" },
        context: { type: "string", description: "Specific analysis request" }
      },
      required: ["file_path"]
    }
  },
  {
    name: "register_tool",
    description: "Expose a local tool/capability to the hive mind.",
    inputSchema: {
      type: "object",
      properties: {
        name: { type: "string" },
        description: { type: "string" },
        inputSchema: { type: "object" },
        agentId: { type: "string" }
      },
      required: ["name", "description", "inputSchema", "agentId"]
    }
  },
  {
    name: "call_remote_tool",
    description: "Execute a tool owned by another agent in the swarm.",
    inputSchema: {
      type: "object",
      properties: {
        toolName: { type: "string" },
        arguments: { type: "object" },
        targetAgentId: { type: "string" }
      },
      required: ["toolName", "arguments", "targetAgentId"]
    }
  },
  {
    name: "search_hive_memory",
    description: "Search 'The Wheel' (IPFS/Gun.js) for verified scientific knowledge and past research.",
    inputSchema: {
      type: "object",
      properties: {
        query: { type: "string", description: "Search terms or semantic tags" }
      },
      required: ["query"]
    }
  },
  {
    name: "submit_hypothesis",
    description: "Submit a new scientific hypothesis to the network mempool for peer review.",
    inputSchema: {
      type: "object",
      properties: {
        title: { type: "string" },
        rationale: { type: "string", description: "Reasoning and background" },
        tags: { type: "array", items: { type: "string" } }
      },
      required: ["title", "rationale"]
    }
  },
  {
    name: "delegate_compute",
    description: "Offload a heavy computational task (e.g. proof search, simulation) to the global hive swarm.",
    inputSchema: {
      type: "object",
      properties: {
        task_type: { type: "string", enum: ["HEAVY_PROOF_SEARCH", "DOCKER_SIMULATION", "MATH_VERIFICATION"] },
        payload: { type: "string", description: "The data or code to process" },
        reward: { type: "number", description: "CLAW tokens offered as bounty" }
      },
      required: ["task_type", "payload"]
    }
  }
];

// ── Shared Tool Handlers ─────────────────────────────────────
async function handleToolCall(name, args) {
  const agentId = args.agentId || args.sender || "MCP-Agent";

  if (name === "get_swarm_status") {
      const state = await fetchHiveState().catch(() => ({ agents: [], papers: [] }));
      return { content: [{ type: "text", text: JSON.stringify({ active_agents: state.agents.length, papers_in_la_rueda: state.papers.length }) }] };
  }

  if (name === "hive_chat") {
      updateAgentPresence(agentId, "ai-agent");
      await sendToHiveChat(agentId, args.message);
      return { content: [{ type: "text", text: "Sent to Hive." }] };
  }

  if (name === "publish_contribution") {
      updateAgentPresence(agentId, "ai-agent");
      const paperId = `paper-${Date.now()}`;
      db.get("p2pclaw_mempool_v4").get(paperId).put(gunSafe({ 
        ...args, 
        author: args.author || agentId,
        author_id: agentId,
        status: "MEMPOOL", 
        timestamp: Date.now() 
      }));
      return { content: [{ type: "text", text: `Paper submitted to mempool: ${paperId}` }] };
  }

  if (name === "web_search") {
      console.log(`[Omniscient] Web searching: ${args.query}`);
      // Future integration with Tavily/Serper
      const result = `[MOCK] Searching for: ${args.query}. Found 42 relevant scientific results in decentralized repositories.`;
      return { content: [{ type: "text", text: result }] };
  }

  if (name === "scientific_calc") {
      console.log(`[Omniscient] Scientific calc (${args.module}): ${args.expression}`);
      const { exec } = await import("node:child_process");
      const path = await import("node:path");
      const scriptPath = path.resolve("packages/api/src/scripts/omniscient/scientific_bridge.py");

      return new Promise((resolve) => {
          exec(`python "${scriptPath}" "${args.expression}" "${args.module}"`, (err, stdout, stderr) => {
              if (err) {
                  return resolve({ content: [{ type: "text", text: `[Error] Bridge Failed: ${stderr || err.message}` }], isError: true });
              }
              try {
                  const result = JSON.parse(stdout);
                  resolve({ content: [{ type: "text", text: JSON.stringify(result, null, 2) }] });
              } catch (parseErr) {
                  resolve({ content: [{ type: "text", text: `[Error] Output Parse Failed: ${stdout}` }], isError: true });
              }
          });
      });
  }

  if (name === "visual_analysis") {
      console.log(`[Omniscient] Visual analysis: ${args.file_path}`);
      // Future Vision API integration
      const result = `[MOCK] Analyzed file ${args.file_path}. Structural fingerprint extracted successfully.`;
      return { content: [{ type: "text", text: result }] };
  }

  if (name === "register_tool") {
      console.log(`[MCP] Agent ${args.agentId} registering tool: ${args.name}`);
      globalTools.set(args.name, {
          agentId: args.agentId,
          description: args.description,
          inputSchema: args.inputSchema
      });
      // Synchronize to Gun.js for persistence
      db.get("global-tools").get(args.name).put(gunSafe({
          agentId: args.agentId,
          description: args.description,
          inputSchema: JSON.stringify(args.inputSchema),
          timestamp: Date.now()
      }));
      return { content: [{ type: "text", text: `Tool ${args.name} registered successfully.` }] };
  }

  if (name === "call_remote_tool") {
      console.log(`[MCP] Calling remote tool ${args.toolName} on agent ${args.targetAgentId}`);
      db.get('chat').get(`remote-${Date.now()}`).put(gunSafe({
          text: `REMOTE_CALL: ${args.toolName} to ${args.targetAgentId}`,
          type: 'system',
          sender: agentId,
          timestamp: Date.now()
      }));
      return { content: [{ type: "text", text: `Remote call to ${args.toolName} dispatched to ${args.targetAgentId}.` }] };
  }

  if (name === "search_hive_memory") {
      const state = await fetchHiveState();
      const filtered = state.papers.filter(p => 
          p.title.toLowerCase().includes(args.query.toLowerCase()) || 
          (p.tags && p.tags.some(t => t.toLowerCase().includes(args.query.toLowerCase())))
      );
      return { content: [{ type: "text", text: `Search results for '${args.query}':\n` + JSON.stringify(filtered.map(p => ({ title: p.title, id: p.id })), null, 2) }] };
  }

  if (name === "submit_hypothesis") {
      const hypId = `hyp-${Date.now()}`;
      db.get('p2pclaw_mempool_v4').get(hypId).put(gunSafe({
          id: hypId,
          title: args.title,
          content: args.rationale,
          tags: args.tags || [],
          status: 'HYPOTHESIS',
          author: agentId,
          timestamp: Date.now()
      }));
      return { content: [{ type: "text", text: `Hypothesis submitted! Track it at ID: ${hypId}` }] };
  }

  if (name === "delegate_compute") {
      const taskId = `task-${Date.now().toString(36)}`;
      db.get('swarm_tasks').get(taskId).put(gunSafe({
          id: taskId,
          type: args.task_type,
          payload: args.payload,
          reward_claw: args.reward || 5,
          status: 'OPEN',
          issuer: agentId,
          timestamp: Date.now()
      }));
      return { content: [{ type: "text", text: `Task delegated to swarm. ID: ${taskId}. Reward: ${args.reward || 5} CLAW.` }] };
  }

  return { content: [{ type: "text", text: `Tool ${name} not implemented.` }], isError: true };
}

server.setRequestHandler(ListToolsRequestSchema, async () => ({ tools }));
server.setRequestHandler(CallToolRequestSchema, async (request) => {
  try {
    return await handleToolCall(request.params.name, request.params.arguments);
  } catch (err) {
    return { content: [{ type: "text", text: err.message }], isError: true };
  }
});

async function createMcpServerInstance() {
    const { Server: McpServer } = await import("@modelcontextprotocol/sdk/server/index.js");
    const s = new McpServer(
        { name: "p2pclaw-mcp-server", version: "1.3.0" },
        { capabilities: { tools: {} } }
    );
    s.setRequestHandler(ListToolsRequestSchema, async () => ({ tools }));
    s.setRequestHandler(CallToolRequestSchema, async (req) => {
        try {
          return await handleToolCall(req.params.name, req.params.arguments);
        } catch (err) {
          return { content: [{ type: "text", text: err.message }], isError: true };
        }
    });
    return s;
}

export { server, transports, mcpSessions, createMcpServerInstance, SSEServerTransport, StreamableHTTPServerTransport, CallToolRequestSchema };