import { useState, useEffect, useCallback } from 'react';
import { useBrotherMachine } from './hooks/useBrotherMachine';
import { FileUpload } from './components/FileUpload';
import { PatternCanvas } from './components/PatternCanvas';
import { ProgressMonitor } from './components/ProgressMonitor';
import { WorkflowStepper } from './components/WorkflowStepper';
import { NextStepGuide } from './components/NextStepGuide';
import { PatternSummaryCard } from './components/PatternSummaryCard';
import type { PesPatternData } from './utils/pystitchConverter';
import { pyodideLoader } from './utils/pyodideLoader';
import { hasError } from './utils/errorCodeHelpers';
import { canDeletePattern, getStateVisualInfo } from './utils/machineStateHelpers';
import { CheckCircleIcon, BoltIcon, PauseCircleIcon, ExclamationTriangleIcon, ArrowPathIcon, XMarkIcon } from '@heroicons/react/24/solid';
import './App.css';

function App() {
  const machine = useBrotherMachine();
  const [pesData, setPesData] = useState<PesPatternData | null>(null);
  const [pyodideReady, setPyodideReady] = useState(false);
  const [pyodideError, setPyodideError] = useState<string | null>(null);
  const [patternOffset, setPatternOffset] = useState<{ x: number; y: number }>({ x: 0, y: 0 });
  const [patternUploaded, setPatternUploaded] = useState(false);
  const [currentFileName, setCurrentFileName] = useState<string>(''); // Track current pattern filename

  // Initialize Pyodide on mount
  useEffect(() => {
    pyodideLoader
      .initialize()
      .then(() => {
        setPyodideReady(true);
        console.log('[App] Pyodide initialized successfully');
      })
      .catch((err) => {
        setPyodideError(err instanceof Error ? err.message : 'Failed to initialize Python environment');
        console.error('[App] Failed to initialize Pyodide:', err);
      });
  }, []);

  // Auto-load cached pattern when available
  const resumedPattern = machine.resumedPattern;
  const resumeFileName = machine.resumeFileName;

  if (resumedPattern && !pesData) {
    console.log('[App] Loading resumed pattern:', resumeFileName, 'Offset:', resumedPattern.patternOffset);
    setPesData(resumedPattern.pesData);
    // Restore the cached pattern offset
    if (resumedPattern.patternOffset) {
      setPatternOffset(resumedPattern.patternOffset);
    }
    // Preserve the filename from cache
    if (resumeFileName) {
      setCurrentFileName(resumeFileName);
    }
  }

  const handlePatternLoaded = useCallback((data: PesPatternData, fileName: string) => {
    setPesData(data);
    setCurrentFileName(fileName);
    // Reset pattern offset when new pattern is loaded
    setPatternOffset({ x: 0, y: 0 });
    setPatternUploaded(false);
  }, []);

  const handlePatternOffsetChange = useCallback((offsetX: number, offsetY: number) => {
    setPatternOffset({ x: offsetX, y: offsetY });
    console.log('[App] Pattern offset changed:', { x: offsetX, y: offsetY });
  }, []);

  const handleUpload = useCallback(async (penData: Uint8Array, pesData: PesPatternData, fileName: string, patternOffset?: { x: number; y: number }) => {
    await machine.uploadPattern(penData, pesData, fileName, patternOffset);
    setPatternUploaded(true);
  }, [machine]);

  const handleDeletePattern = useCallback(async () => {
    await machine.deletePattern();
    setPatternUploaded(false);
    // NOTE: We intentionally DON'T clear setPesData(null) here
    // so the pattern remains visible in the canvas for re-editing and re-uploading
  }, [machine]);

  // Track pattern uploaded state based on machine status
  const isConnected = machine.isConnected;
  const patternInfo = machine.patternInfo;

  if (!isConnected) {
    if (patternUploaded) {
      setPatternUploaded(false);
    }
  } else {
    // Pattern is uploaded if machine has pattern info
    const shouldBeUploaded = patternInfo !== null;
    if (patternUploaded !== shouldBeUploaded) {
      setPatternUploaded(shouldBeUploaded);
    }
  }

  // Get state visual info for header status badge
  const stateVisual = getStateVisualInfo(machine.machineStatus);
  const stateIcons = {
    ready: CheckCircleIcon,
    active: BoltIcon,
    waiting: PauseCircleIcon,
    complete: CheckCircleIcon,
    interrupted: PauseCircleIcon,
    error: ExclamationTriangleIcon,
  };
  const StatusIcon = stateIcons[stateVisual.iconName];

  return (
    <div className="min-h-screen flex flex-col bg-gray-50 dark:bg-gray-900">
      <header className="bg-gradient-to-r from-blue-600 via-blue-700 to-blue-800 dark:from-blue-700 dark:via-blue-800 dark:to-blue-900 px-8 py-3 shadow-lg border-b-2 border-blue-900/20 dark:border-blue-800/30">
        <div className="max-w-[1600px] mx-auto grid grid-cols-[300px_1fr] gap-8 items-center">
          {/* Machine Connection Status - Fixed width column */}
          <div className="flex items-center gap-3 w-[300px]">
            <div className="w-2.5 h-2.5 bg-green-400 rounded-full animate-pulse shadow-lg shadow-green-400/50" style={{ visibility: machine.isConnected ? 'visible' : 'hidden' }}></div>
            <div className="w-2.5 h-2.5 bg-gray-400 rounded-full -ml-2.5" style={{ visibility: !machine.isConnected ? 'visible' : 'hidden' }}></div>
            <div className="flex-1 min-w-0">
              <div className="flex items-center gap-2">
                <h1 className="text-lg font-bold text-white leading-tight">SKiTCH Controller</h1>
                {machine.isConnected && machine.machineInfo?.serialNumber && (
                  <span
                    className="text-sm text-blue-200 cursor-help"
                    title={`Serial: ${machine.machineInfo.serialNumber}${
                      machine.machineInfo.macAddress
                        ? `\nMAC: ${machine.machineInfo.macAddress}`
                        : ''
                    }${
                      machine.machineInfo.totalCount !== undefined
                        ? `\nTotal stitches: ${machine.machineInfo.totalCount.toLocaleString()}`
                        : ''
                    }${
                      machine.machineInfo.serviceCount !== undefined
                        ? `\nStitches since service: ${machine.machineInfo.serviceCount.toLocaleString()}`
                        : ''
                    }`}
                  >
                    • {machine.machineInfo.serialNumber}
                  </span>
                )}
                {machine.isPolling && (
                  <ArrowPathIcon className="w-3.5 h-3.5 text-blue-200 animate-spin" title="Auto-refreshing status" />
                )}
              </div>
              <div className="flex items-center gap-2 mt-1">
                {machine.isConnected ? (
                  <>
                    <button
                      onClick={machine.disconnect}
                      className="inline-flex items-center gap-1.5 px-2.5 py-1 rounded text-xs font-medium bg-white/10 hover:bg-white/20 text-blue-100 hover:text-white border border-white/20 hover:border-white/30 cursor-pointer transition-all flex-shrink-0"
                      title="Disconnect from machine"
                      aria-label="Disconnect from machine"
                    >
                      <XMarkIcon className="w-3 h-3" />
                      Disconnect
                    </button>
                    <span className="inline-flex items-center gap-1.5 px-2.5 py-1 rounded text-xs font-semibold bg-white/20 text-white border border-white/30 flex-shrink-0">
                      <StatusIcon className="w-3 h-3" />
                      {machine.machineStatusName}
                    </span>
                  </>
                ) : (
                  <p className="text-sm text-blue-200">Not Connected</p>
                )}
              </div>
            </div>
          </div>

          {/* Workflow Stepper - Flexible width column */}
          <div>
            <WorkflowStepper
              machineStatus={machine.machineStatus}
              isConnected={machine.isConnected}
              hasPattern={pesData !== null}
              patternUploaded={patternUploaded}
            />
          </div>
        </div>
      </header>

      <div className="flex-1 p-6 max-w-[1600px] w-full mx-auto">
        {/* Global errors */}
        {machine.error && (
          <div className="bg-red-50 dark:bg-red-900/20 text-red-900 dark:text-red-200 px-6 py-4 rounded-lg border-l-4 border-red-600 dark:border-red-500 mb-6 shadow-md hover:shadow-lg transition-shadow animate-fadeIn">
            <div className="flex items-center gap-2">
              <svg className="w-5 h-5 text-red-600 dark:text-red-400 flex-shrink-0" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z" />
              </svg>
              <div>
                <strong className="font-semibold">Error:</strong> {machine.error}
              </div>
            </div>
          </div>
        )}
        {pyodideError && (
          <div className="bg-red-50 dark:bg-red-900/20 text-red-900 dark:text-red-200 px-6 py-4 rounded-lg border-l-4 border-red-600 dark:border-red-500 mb-6 shadow-md hover:shadow-lg transition-shadow animate-fadeIn">
            <div className="flex items-center gap-2">
              <svg className="w-5 h-5 text-red-600 dark:text-red-400 flex-shrink-0" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 8v4m0 4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z" />
              </svg>
              <div>
                <strong className="font-semibold">Python Error:</strong> {pyodideError}
              </div>
            </div>
          </div>
        )}
        {!pyodideReady && !pyodideError && (
          <div className="bg-blue-50 dark:bg-blue-900/20 text-blue-900 dark:text-blue-200 px-6 py-4 rounded-lg border-l-4 border-blue-600 dark:border-blue-500 mb-6 shadow-md animate-fadeIn">
            <div className="flex items-center gap-3">
              <svg className="w-5 h-5 animate-spin text-blue-600 dark:text-blue-400" fill="none" viewBox="0 0 24 24">
                <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4"></circle>
                <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
              </svg>
              <span className="font-medium">Initializing Python environment...</span>
            </div>
          </div>
        )}

        <div className="grid grid-cols-1 lg:grid-cols-[400px_1fr] gap-6">
          {/* Left Column - Controls */}
          <div className="flex flex-col gap-6">
            {/* Connect Button - Show when disconnected */}
            {!machine.isConnected && (
              <div className="bg-white dark:bg-gray-800 p-4 rounded-lg shadow-md border-l-4 border-gray-400 dark:border-gray-600">
                <div className="flex items-start gap-3 mb-3">
                  <div className="w-6 h-6 text-gray-600 dark:text-gray-400 flex-shrink-0 mt-0.5">
                    <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M8.111 16.404a5.5 5.5 0 017.778 0M12 20h.01m-7.08-7.071c3.904-3.905 10.236-3.905 14.141 0M1.394 9.393c5.857-5.857 15.355-5.857 21.213 0" />
                    </svg>
                  </div>
                  <div className="flex-1 min-w-0">
                    <h3 className="text-sm font-semibold text-gray-900 dark:text-white mb-1">Get Started</h3>
                    <p className="text-xs text-gray-600 dark:text-gray-400">Connect to your embroidery machine</p>
                  </div>
                </div>
                <button
                  onClick={machine.connect}
                  className="w-full flex items-center justify-center gap-2 px-3 py-2 bg-blue-600 dark:bg-blue-700 text-white rounded font-semibold text-xs hover:bg-blue-700 dark:hover:bg-blue-600 active:bg-blue-800 dark:active:bg-blue-500 transition-colors cursor-pointer"
                >
                  Connect to Machine
                </button>
              </div>
            )}

            {/* Pattern File - Show during upload stage (before pattern is uploaded) */}
            {machine.isConnected && !patternUploaded && (
              <FileUpload
                isConnected={machine.isConnected}
                machineStatus={machine.machineStatus}
                uploadProgress={machine.uploadProgress}
                onPatternLoaded={handlePatternLoaded}
                onUpload={handleUpload}
                pyodideReady={pyodideReady}
                patternOffset={patternOffset}
                patternUploaded={patternUploaded}
                resumeAvailable={machine.resumeAvailable}
                resumeFileName={machine.resumeFileName}
                pesData={pesData}
                currentFileName={currentFileName}
                isUploading={machine.isUploading}
              />
            )}

            {/* Compact Pattern Summary - Show after upload (during sewing stages) */}
            {machine.isConnected && patternUploaded && pesData && (
              <PatternSummaryCard
                pesData={pesData}
                fileName={currentFileName}
                onDeletePattern={handleDeletePattern}
                canDelete={canDeletePattern(machine.machineStatus)}
                isDeleting={machine.isDeleting}
              />
            )}

            {/* Progress Monitor - Show when pattern is uploaded */}
            {machine.isConnected && patternUploaded && (
              <ProgressMonitor
                machineStatus={machine.machineStatus}
                patternInfo={machine.patternInfo}
                sewingProgress={machine.sewingProgress}
                pesData={pesData}
                onStartMaskTrace={machine.startMaskTrace}
                onStartSewing={machine.startSewing}
                onResumeSewing={machine.resumeSewing}
                onDeletePattern={handleDeletePattern}
                isDeleting={machine.isDeleting}
              />
            )}
          </div>

          {/* Right Column - Pattern Preview */}
          <div className="flex flex-col gap-6">
            {pesData ? (
              <PatternCanvas
                pesData={pesData}
                sewingProgress={machine.sewingProgress}
                machineInfo={machine.machineInfo}
                initialPatternOffset={patternOffset}
                onPatternOffsetChange={handlePatternOffsetChange}
                patternUploaded={patternUploaded}
                isUploading={machine.uploadProgress > 0 && machine.uploadProgress < 100}
              />
            ) : (
              <div className="bg-white dark:bg-gray-800 p-6 rounded-lg shadow-md animate-fadeIn">
                <h2 className="text-xl font-semibold mb-4 pb-2 border-b-2 border-gray-300 dark:border-gray-600 dark:text-white">Pattern Preview</h2>
                <div className="flex items-center justify-center h-[600px] bg-gradient-to-br from-gray-50 to-gray-100 dark:from-gray-700 dark:to-gray-800 rounded-lg border-2 border-dashed border-gray-300 dark:border-gray-600 relative overflow-hidden">
                  {/* Decorative background pattern */}
                  <div className="absolute inset-0 opacity-5 dark:opacity-10">
                    <div className="absolute top-10 left-10 w-32 h-32 border-4 border-gray-400 dark:border-gray-500 rounded-full"></div>
                    <div className="absolute bottom-10 right-10 w-40 h-40 border-4 border-gray-400 dark:border-gray-500 rounded-full"></div>
                    <div className="absolute top-1/2 left-1/2 transform -translate-x-1/2 -translate-y-1/2 w-48 h-48 border-4 border-gray-400 dark:border-gray-500 rounded-full"></div>
                  </div>

                  <div className="text-center relative z-10">
                    <div className="relative inline-block mb-6">
                      <svg className="w-28 h-28 mx-auto text-gray-300 dark:text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M7 21h10a2 2 0 002-2V9.414a1 1 0 00-.293-.707l-5.414-5.414A1 1 0 0012.586 3H7a2 2 0 00-2 2v14a2 2 0 002 2z" />
                      </svg>
                      <div className="absolute -top-2 -right-2 w-8 h-8 bg-blue-100 dark:bg-blue-900 rounded-full flex items-center justify-center">
                        <svg className="w-5 h-5 text-blue-600 dark:text-blue-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 4v16m8-8H4" />
                        </svg>
                      </div>
                    </div>
                    <h3 className="text-gray-700 dark:text-gray-200 text-xl font-semibold mb-2">No Pattern Loaded</h3>
                    <p className="text-gray-500 dark:text-gray-400 text-sm mb-4 max-w-sm mx-auto">
                      Connect to your machine and choose a PES embroidery file to see your design preview
                    </p>
                    <div className="flex items-center justify-center gap-6 text-xs text-gray-400 dark:text-gray-500">
                      <div className="flex items-center gap-1">
                        <div className="w-2 h-2 bg-blue-400 dark:bg-blue-500 rounded-full"></div>
                        <span>Drag to Position</span>
                      </div>
                      <div className="flex items-center gap-1">
                        <div className="w-2 h-2 bg-green-400 dark:bg-green-500 rounded-full"></div>
                        <span>Zoom & Pan</span>
                      </div>
                      <div className="flex items-center gap-1">
                        <div className="w-2 h-2 bg-purple-400 dark:bg-purple-500 rounded-full"></div>
                        <span>Real-time Preview</span>
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            )}

            {/* Next Step Guide - Below pattern preview */}
            <NextStepGuide
              machineStatus={machine.machineStatus}
              isConnected={machine.isConnected}
              hasPattern={pesData !== null}
              patternUploaded={patternUploaded}
              hasError={hasError(machine.machineError)}
              errorMessage={machine.error || undefined}
              errorCode={machine.machineError}
            />
          </div>
        </div>
      </div>
    </div>
  );
}

export default App;