import React, { useState, useEffect } from 'react';
import DashboardPage from './pages/dashboard/DashboardPage';
import { UserMenu, ErrorBoundary } from './components/common';
import BOMManagementPage from './pages/BOMManagementPage';
import UnifiedBOMPage from './pages/UnifiedBOMPage';
import SystemSettingsPage from './pages/SystemSettingsPage';
import PurchaseBatchPage from './pages/PurchaseBatchPage';
import PurchaseRequestPage from './pages/PurchaseRequestPage';
import SystemLogsPage from './pages/SystemLogsPage';
import LogMonitoringPage from './pages/LogMonitoringPage';
import InactiveProjectsPage from './pages/InactiveProjectsPage';
import api from './api';
import { config } from './config';
import './App.css';

function getSSOToken() {
  const match = document.cookie.match(/sso_token=([^;]*)/);
  return match ? match[1] : null;
}

function parseJwt(token) {
  try {
    const base64Url = token.split('.')[1];
    const base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/');
    const jsonPayload = decodeURIComponent(
      atob(base64).split('').map(c =>
        '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2)
      ).join('')
    );
    return JSON.parse(jsonPayload);
  } catch { return null; }
}

function App() {
  const [isAuthenticated, setIsAuthenticated] = useState(false);
  const [isLoading, setIsLoading] = useState(true);
  const [user, setUser] = useState(null);
  const [currentPage, setCurrentPage] = useState('dashboard');
  const [pageParams, setPageParams] = useState({});
  const [projects, setProjects] = useState([]);
  const [editingProject, setEditingProject] = useState(null);
  const [editedProjectName, setEditedProjectName] = useState('');
  const [showCreateProject, setShowCreateProject] = useState(false);
  const [newProjectCode, setNewProjectCode] = useState('');
  const [newProjectName, setNewProjectName] = useState('');
  const [newClientName, setNewClientName] = useState('');
  const [inactiveProjects, setInactiveProjects] = useState(() => {
    try {
      const saved = localStorage.getItem('tkeg_inactiveProjects');
      return saved ? new Set(JSON.parse(saved)) : new Set();
    } catch { return new Set(); }
  });

  useEffect(() => {
    try {
      localStorage.setItem('tkeg_inactiveProjects', JSON.stringify(Array.from(inactiveProjects)));
    } catch {}
  }, [inactiveProjects]);

  const loadProjects = async () => {
    try {
      const response = await api.get('/jobs/');
      if (response.data?.jobs) {
        setProjects(response.data.jobs);
      }
    } catch (error) {
      console.error('프로젝트 목록 로드 실패:', error);
    }
  };

  const handleActivateProject = (project) => {
    const projectId = project.job_no || project.id;
    setInactiveProjects(prev => {
      const newSet = new Set(prev);
      newSet.delete(projectId);
      return newSet;
    });
  };

  // SSO 인증 확인
  useEffect(() => {
    const token = getSSOToken();
    if (!token) {
      window.location.href = config.ssoLoginUrl(window.location.href);
      return;
    }
    const payload = parseJwt(token);
    if (!payload) {
      window.location.href = config.ssoLoginUrl();
      return;
    }
    setUser({
      user_id: payload.user_id,
      username: payload.sub || payload.username,
      name: payload.name || payload.username || payload.sub,
      role: payload.role || 'user',
      department: payload.department,
    });
    setIsAuthenticated(true);
    setIsLoading(false);
    loadProjects();
  }, []);

  const navigateToPage = (page, params = {}) => {
    setCurrentPage(page);
    setPageParams(params);
  };

  const handleLogout = () => {
    document.cookie = `sso_token=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/${config.cookieDomain}`;
    window.location.href = config.ssoLoginUrl();
  };

  const renderCurrentPage = () => {
    switch (currentPage) {
      case 'dashboard':
        return (
          <DashboardPage
            user={user}
            projects={projects}
            pendingSignupCount={0}
            navigateToPage={navigateToPage}
            loadProjects={loadProjects}
            createProject={() => {}}
            updateProjectName={() => {}}
            deleteProject={() => {}}
            editingProject={editingProject}
            setEditingProject={setEditingProject}
            editedProjectName={editedProjectName}
            setEditedProjectName={setEditedProjectName}
            showCreateProject={showCreateProject}
            setShowCreateProject={setShowCreateProject}
            newProjectCode={newProjectCode}
            setNewProjectCode={setNewProjectCode}
            newProjectName={newProjectName}
            setNewProjectName={setNewProjectName}
            newClientName={newClientName}
            setNewClientName={setNewClientName}
            inactiveProjects={inactiveProjects}
            setInactiveProjects={setInactiveProjects}
          />
        );
      case 'unified-bom':
        return <UnifiedBOMPage onNavigate={navigateToPage} selectedProject={pageParams.selectedProject} user={user} />;
      case 'materials':
        return (
          <BOMManagementPage
            onNavigate={navigateToPage}
            user={user}
            selectedProject={pageParams.selectedProject}
            fileId={pageParams.file_id}
            jobNo={pageParams.jobNo}
            bomName={pageParams.bomName}
            revision={pageParams.revision}
            filename={pageParams.filename}
          />
        );
      case 'purchase-batch':
        return <PurchaseBatchPage onNavigate={navigateToPage} user={user} selectedProject={pageParams.selectedProject} />;
      case 'purchase-request':
        return <PurchaseRequestPage onNavigate={navigateToPage} user={user} selectedProject={pageParams.selectedProject} />;
      case 'system-settings':
        return <SystemSettingsPage onNavigate={navigateToPage} user={user} />;
      case 'system-logs':
        return <SystemLogsPage onNavigate={navigateToPage} user={user} />;
      case 'log-monitoring':
        return <LogMonitoringPage onNavigate={navigateToPage} user={user} />;
      case 'inactive-projects':
        return (
          <InactiveProjectsPage
            onNavigate={navigateToPage}
            user={user}
            projects={projects}
            inactiveProjects={inactiveProjects}
            onActivateProject={handleActivateProject}
            onDeleteProject={() => {}}
          />
        );
      default:
        return (
          <div style={{ display: 'flex', justifyContent: 'center', alignItems: 'center', height: '100vh', background: '#f7fafc' }}>
            <div style={{ textAlign: 'center' }}>
              <div style={{ fontSize: '16px', color: '#718096' }}>알 수 없는 페이지입니다.</div>
              <button onClick={() => navigateToPage('dashboard')} style={{ background: '#4299e1', color: 'white', border: 'none', borderRadius: '6px', padding: '12px 24px', cursor: 'pointer', marginTop: '16px' }}>
                대시보드로 돌아가기
              </button>
            </div>
          </div>
        );
    }
  };

  if (isLoading) {
    return (
      <div style={{ display: 'flex', justifyContent: 'center', alignItems: 'center', height: '100vh', background: '#f7fafc' }}>
        <div style={{ textAlign: 'center' }}>
          <div style={{ fontSize: '16px', color: '#718096' }}>로딩 중...</div>
        </div>
      </div>
    );
  }

  if (!isAuthenticated) return null;

  return (
    <ErrorBoundary errorContext={{ user, currentPage, pageParams }}>
      <div style={{ minHeight: '100vh', background: '#f7fafc' }}>
        <div style={{
          background: 'white', borderBottom: '1px solid #e2e8f0',
          padding: '16px 32px', display: 'flex', justifyContent: 'space-between', alignItems: 'center'
        }}>
          <div>
            <h1 style={{ fontSize: '24px', fontWeight: '700', color: '#2d3748', margin: 0 }}>
              TK-EG BOM Management System
            </h1>
            <p style={{ color: '#718096', fontSize: '14px', margin: '4px 0 0 0' }}>
              {user?.name || user?.username}님 환영합니다
            </p>
          </div>
          <UserMenu user={user} onNavigate={navigateToPage} onLogout={handleLogout} />
        </div>
        {renderCurrentPage()}
      </div>
    </ErrorBoundary>
  );
}

export default App;