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import { useState, useEffect } from 'react';
import { useUser } from '../context/UserContext';
import { useProject } from '../context/ProjectContext';
import { api } from '../api/client';
import type { Project } from '../types';

type Mode = 'select' | 'create' | 'join';

export function ProjectSelectionPage() {
  const { user, logout } = useUser();
  const { setCurrentProject } = useProject();

  const [mode, setMode] = useState<Mode>('select');
  const [existingProjects, setExistingProjects] = useState<Project[]>([]);
  const [isLoading, setIsLoading] = useState(true);
  const [error, setError] = useState('');

  // Create form state
  const [projectName, setProjectName] = useState('');
  const [projectDescription, setProjectDescription] = useState('');

  // Join form state
  const [joinProjectId, setJoinProjectId] = useState('');

  const [isSubmitting, setIsSubmitting] = useState(false);

  // Fetch existing projects on mount
  useEffect(() => {
    if (!user) return;

    const fetchProjects = async () => {
      try {
        const response = await api.listProjects(user.id);
        setExistingProjects(response.projects || []);
      } catch (err) {
        console.error('Failed to fetch projects:', err);
      } finally {
        setIsLoading(false);
      }
    };

    fetchProjects();
  }, [user]);

  const handleSelectProject = (project: Project) => {
    setCurrentProject(project);
  };

  const handleCreateProject = async (e: React.FormEvent) => {
    e.preventDefault();
    setError('');

    if (!projectName.trim()) {
      setError('Project name is required');
      return;
    }

    if (!user) return;

    setIsSubmitting(true);
    try {
      // Check if project name is available (since name = id)
      const availability = await api.checkProjectAvailability(projectName.trim());
      if (!availability.available) {
        setError('Project name already taken. Try a different name.');
        setIsSubmitting(false);
        return;
      }

      const project = await api.createProject({
        name: projectName.trim(),
        description: projectDescription.trim(),
        userId: user.id,
      });

      setCurrentProject({ ...project, role: 'owner' });
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to create project');
    } finally {
      setIsSubmitting(false);
    }
  };

  const handleJoinProject = async (e: React.FormEvent) => {
    e.preventDefault();
    setError('');

    if (!joinProjectId.trim()) {
      setError('Project ID is required');
      return;
    }

    if (!user) return;

    setIsSubmitting(true);
    try {
      const result = await api.joinProject(joinProjectId.trim(), user.id);

      // Fetch the full project details
      const projects = await api.listProjects(user.id);
      const joinedProject = projects.projects?.find(p => p.id === result.project_id);

      if (joinedProject) {
        setCurrentProject(joinedProject);
      } else {
        // Fallback if project not found in list
        setCurrentProject({
          id: result.project_id,
          name: result.project_id,
          description: '',
          created_at: new Date().toISOString(),
          role: result.role,
        });
      }
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to join project');
    } finally {
      setIsSubmitting(false);
    }
  };

  if (!user) return null;

  return (
    <div className="min-h-screen bg-gradient-to-br from-slate-900 via-purple-900 to-slate-900">
      {/* Header */}
      <header className="bg-white/5 backdrop-blur-lg border-b border-white/10">
        <div className="max-w-4xl mx-auto px-4 py-4 flex items-center justify-between">
          <h1 className="text-xl font-bold text-white">Project Memory</h1>
          <div className="flex items-center gap-4">
            <span className="text-purple-300 text-sm">{user.firstName} ({user.id})</span>
            <button
              onClick={logout}
              className="px-3 py-1.5 bg-white/10 hover:bg-white/20 text-white rounded-lg transition-all text-sm"
            >
              Logout
            </button>
          </div>
        </div>
      </header>

      {/* Main Content */}
      <main className="max-w-4xl mx-auto px-4 py-8">
        <div className="text-center mb-8">
          <h2 className="text-3xl font-bold text-white mb-2">Select a Project</h2>
          <p className="text-purple-300">Choose an existing project or start fresh</p>
        </div>

        {/* Error Display */}
        {error && (
          <div className="mb-6 p-4 bg-red-500/20 border border-red-500/50 rounded-lg text-red-200 text-center">
            {error}
          </div>
        )}

        {/* Loading State */}
        {isLoading ? (
          <div className="text-center text-purple-300 py-12">Loading projects...</div>
        ) : (
          <>
            {/* Existing Projects */}
            {existingProjects.length > 0 && mode === 'select' && (
              <div className="mb-8">
                <h3 className="text-lg font-semibold text-white mb-4">Your Projects</h3>
                <div className="grid gap-4 md:grid-cols-2">
                  {existingProjects.map((project) => (
                    <button
                      key={project.id}
                      onClick={() => handleSelectProject(project)}
                      className="text-left p-4 bg-white/10 hover:bg-white/20 border border-white/20 hover:border-purple-500/50 rounded-xl transition-all group"
                    >
                      <div className="flex items-start justify-between">
                        <div>
                          <h4 className="text-white font-medium group-hover:text-purple-300 transition-colors">
                            {project.name}
                          </h4>
                          <p className="text-purple-300/70 text-sm mt-1 line-clamp-2">
                            {project.description || 'No description'}
                          </p>
                        </div>
                        <span className="text-xs px-2 py-1 bg-purple-500/20 text-purple-300 rounded">
                          {project.role}
                        </span>
                      </div>
                    </button>
                  ))}
                </div>
              </div>
            )}

            {/* Action Buttons (when in select mode) */}
            {mode === 'select' && (
              <div className="grid gap-4 md:grid-cols-2">
                <button
                  onClick={() => setMode('create')}
                  className="p-6 bg-purple-600/20 hover:bg-purple-600/30 border-2 border-dashed border-purple-500/50 hover:border-purple-500 rounded-xl transition-all text-center"
                >
                  <div className="text-4xl mb-2">+</div>
                  <h4 className="text-white font-medium">Create New Project</h4>
                  <p className="text-purple-300/70 text-sm mt-1">Start a new team project</p>
                </button>

                <button
                  onClick={() => setMode('join')}
                  className="p-6 bg-white/5 hover:bg-white/10 border-2 border-dashed border-white/20 hover:border-white/40 rounded-xl transition-all text-center"
                >
                  <div className="text-4xl mb-2"></div>
                  <h4 className="text-white font-medium">Join Existing Project</h4>
                  <p className="text-purple-300/70 text-sm mt-1">Enter a project ID to join</p>
                </button>
              </div>
            )}

            {/* Create Project Form */}
            {mode === 'create' && (
              <div className="bg-white/10 backdrop-blur-lg rounded-2xl p-8 border border-white/20">
                <div className="flex items-center justify-between mb-6">
                  <h3 className="text-xl font-semibold text-white">Create New Project</h3>
                  <button
                    onClick={() => { setMode('select'); setError(''); }}
                    className="text-purple-300 hover:text-white text-sm"
                  >
                    ← Back
                  </button>
                </div>

                <form onSubmit={handleCreateProject} className="space-y-4">
                  <div>
                    <label htmlFor="projectName" className="block text-sm font-medium text-purple-200 mb-1">
                      Project Name (also used as ID)
                    </label>
                    <input
                      id="projectName"
                      type="text"
                      value={projectName}
                      onChange={(e) => setProjectName(e.target.value)}
                      placeholder="e.g., fastgate"
                      className="w-full px-4 py-3 bg-white/5 border border-white/10 rounded-lg text-white placeholder-white/40 focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent"
                      disabled={isSubmitting}
                    />
                    <p className="text-purple-300/50 text-xs mt-1">Must be unique. This will be the project ID.</p>
                  </div>

                  <div>
                    <label htmlFor="projectDescription" className="block text-sm font-medium text-purple-200 mb-1">
                      Description
                    </label>
                    <textarea
                      id="projectDescription"
                      value={projectDescription}
                      onChange={(e) => setProjectDescription(e.target.value)}
                      placeholder="What is this project about?"
                      rows={3}
                      className="w-full px-4 py-3 bg-white/5 border border-white/10 rounded-lg text-white placeholder-white/40 focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent resize-none"
                      disabled={isSubmitting}
                    />
                  </div>

                  <button
                    type="submit"
                    disabled={isSubmitting}
                    className="w-full py-3 px-4 bg-purple-600 hover:bg-purple-700 disabled:bg-purple-800 disabled:cursor-not-allowed text-white font-medium rounded-lg transition-all"
                  >
                    {isSubmitting ? 'Creating...' : 'Create Project'}
                  </button>
                </form>
              </div>
            )}

            {/* Join Project Form */}
            {mode === 'join' && (
              <div className="bg-white/10 backdrop-blur-lg rounded-2xl p-8 border border-white/20">
                <div className="flex items-center justify-between mb-6">
                  <h3 className="text-xl font-semibold text-white">Join Existing Project</h3>
                  <button
                    onClick={() => { setMode('select'); setError(''); }}
                    className="text-purple-300 hover:text-white text-sm"
                  >
                    ← Back
                  </button>
                </div>

                <form onSubmit={handleJoinProject} className="space-y-4">
                  <div>
                    <label htmlFor="joinProjectId" className="block text-sm font-medium text-purple-200 mb-1">
                      Project ID
                    </label>
                    <input
                      id="joinProjectId"
                      type="text"
                      value={joinProjectId}
                      onChange={(e) => setJoinProjectId(e.target.value)}
                      placeholder="Enter the project ID"
                      className="w-full px-4 py-3 bg-white/5 border border-white/10 rounded-lg text-white placeholder-white/40 focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent"
                      disabled={isSubmitting}
                    />
                    <p className="text-purple-300/50 text-xs mt-1">Ask your team lead for the project ID</p>
                  </div>

                  <button
                    type="submit"
                    disabled={isSubmitting}
                    className="w-full py-3 px-4 bg-purple-600 hover:bg-purple-700 disabled:bg-purple-800 disabled:cursor-not-allowed text-white font-medium rounded-lg transition-all"
                  >
                    {isSubmitting ? 'Joining...' : 'Join Project'}
                  </button>
                </form>
              </div>
            )}
          </>
        )}
      </main>
    </div>
  );
}