'use client';

import React, { useCallback, useEffect, useState } from 'react';
import { ReactFlowProvider } from '@xyflow/react';
import {
  Sparkles,
  FlaskConical,
  Rocket,
  Plus,
} from 'lucide-react';

import { ToolCanvas } from '../../../../components/canvas/ToolCanvas';
import { ToolInspector } from '../../../../components/inspector/ToolInspector';
import { useCanvasState } from '../../../../hooks/useCanvasState';

import type { ToolDefinition } from '@mcpengine/ai-pipeline/types';
import type { ToolNodeData } from '../../../../components/canvas/ToolNode';

// Mock data for development — replaced by API calls in production
const MOCK_TOOLS: ToolDefinition[] = [
  {
    name: 'list_contacts',
    description: 'Retrieve a paginated list of contacts with optional filtering by tags, dates, and custom fields.',
    method: 'GET',
    endpoint: '/contacts',
    inputSchema: {
      type: 'object',
      properties: {
        limit: { type: 'number', description: 'Max results to return' },
        offset: { type: 'number', description: 'Pagination offset' },
        tag: { type: 'string', description: 'Filter by tag' },
      },
      required: [],
    },
    annotations: { readOnlyHint: true, idempotentHint: true },
  },
  {
    name: 'create_contact',
    description: 'Create a new contact with the provided information.',
    method: 'POST',
    endpoint: '/contacts',
    inputSchema: {
      type: 'object',
      properties: {
        email: { type: 'string', description: 'Contact email address' },
        name: { type: 'string', description: 'Full name' },
        phone: { type: 'string', description: 'Phone number' },
      },
      required: ['email', 'name'],
    },
  },
  {
    name: 'delete_contact',
    description: 'Permanently delete a contact by their ID. This action cannot be undone.',
    method: 'DELETE',
    endpoint: '/contacts/{id}',
    inputSchema: {
      type: 'object',
      properties: {
        id: { type: 'string', description: 'Contact ID' },
      },
      required: ['id'],
    },
    annotations: { destructiveHint: true },
  },
  {
    name: 'update_contact',
    description: 'Update an existing contact\'s information.',
    method: 'PUT',
    endpoint: '/contacts/{id}',
    inputSchema: {
      type: 'object',
      properties: {
        id: { type: 'string', description: 'Contact ID' },
        email: { type: 'string', description: 'Updated email' },
        name: { type: 'string', description: 'Updated name' },
      },
      required: ['id'],
    },
    annotations: { idempotentHint: true },
  },
];

export default function ProjectEditorPage() {
  const [tools, setTools] = useState<ToolDefinition[]>(MOCK_TOOLS);
  const {
    selectedNodeId,
    inspectorOpen,
    nodes,
    initializeFromTools,
    selectNode,
    updateTool,
    removeTool,
  } = useCanvasState();

  // Initialize canvas from tools
  useEffect(() => {
    initializeFromTools(tools);
  }, []); // eslint-disable-line react-hooks/exhaustive-deps

  // Get selected tool
  const selectedTool = selectedNodeId
    ? (nodes.find((n) => n.id === selectedNodeId)?.data as ToolNodeData | undefined)?.tool
    : null;

  const handleToolSelect = useCallback(
    (toolName: string | null) => {
      selectNode(toolName);
    },
    [selectNode]
  );

  const handleToolsChange = useCallback((updated: ToolDefinition[]) => {
    setTools(updated);
  }, []);

  const handleToolChange = useCallback(
    (updatedTool: ToolDefinition) => {
      if (!selectedNodeId) return;
      updateTool(selectedNodeId, updatedTool);
      setTools((prev) =>
        prev.map((t) => (t.name === selectedNodeId ? updatedTool : t))
      );
    },
    [selectedNodeId, updateTool]
  );

  const handleToolDelete = useCallback(
    (toolName: string) => {
      removeTool(toolName);
      setTools((prev) => prev.filter((t) => t.name !== toolName));
    },
    [removeTool]
  );

  const handleCloseInspector = useCallback(() => {
    selectNode(null);
  }, [selectNode]);

  return (
    <div className="flex flex-col h-screen bg-[#0A0F1E]">
      {/* Top Bar */}
      <header className="flex items-center justify-between px-6 py-3 border-b border-gray-800 bg-gray-900/80 backdrop-blur-sm z-10">
        <div className="flex items-center gap-3">
          <div className="w-2 h-2 rounded-full bg-emerald-400 animate-pulse" />
          <h1 className="text-sm font-semibold text-gray-100">
            Project Editor
          </h1>
          <span className="text-xs text-gray-500">
            {tools.length} tools
          </span>
        </div>

        <div className="flex items-center gap-2">
          <button className="flex items-center gap-1.5 px-3 py-1.5 bg-gray-800 border border-gray-700 rounded-lg text-xs text-gray-300 hover:border-gray-600 transition-colors">
            <Plus className="w-3.5 h-3.5" />
            Add Tool
          </button>
          <div className="w-px h-6 bg-gray-800" />
          <button className="flex items-center gap-1.5 px-3 py-1.5 bg-gray-800 border border-gray-700 rounded-lg text-xs text-gray-300 hover:border-gray-600 transition-colors">
            <Sparkles className="w-3.5 h-3.5 text-amber-400" />
            Analyze
          </button>
          <button className="flex items-center gap-1.5 px-3 py-1.5 bg-gray-800 border border-gray-700 rounded-lg text-xs text-gray-300 hover:border-gray-600 transition-colors">
            <FlaskConical className="w-3.5 h-3.5 text-blue-400" />
            Test
          </button>
          <button className="flex items-center gap-1.5 px-3 py-1.5 bg-indigo-600 hover:bg-indigo-500 rounded-lg text-xs text-white transition-colors">
            <Rocket className="w-3.5 h-3.5" />
            Deploy
          </button>
        </div>
      </header>

      {/* Main Content */}
      <div className="flex flex-1 overflow-hidden">
        {/* Canvas */}
        <ReactFlowProvider>
          <div className="flex-1 relative">
            <ToolCanvas
              tools={tools}
              onToolSelect={handleToolSelect}
              onToolsChange={handleToolsChange}
            />
          </div>
        </ReactFlowProvider>

        {/* Inspector Panel — slides in from right */}
        <div
          className={`
            transition-all duration-300 ease-in-out overflow-hidden
            ${inspectorOpen && selectedTool ? 'w-[380px]' : 'w-0'}
          `}
        >
          {selectedTool && (
            <ToolInspector
              tool={selectedTool}
              onChange={handleToolChange}
              onDelete={handleToolDelete}
              onClose={handleCloseInspector}
            />
          )}
        </div>
      </div>
    </div>
  );
}