import React, { useState, useEffect } from 'react';
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';
import { Progress } from '@/components/ui/progress';
import { Plus, Play, Pause, Download, Trash2, Eye } from 'lucide-react';
import '../App.css';

const Dashboard = ({ onCreateProject, onViewProject }) => {
  const [projects, setProjects] = useState([]);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    fetchProjects();
  }, []);

  const fetchProjects = async () => {
    try {
      const response = await fetch('/api/projects');
      const data = await response.json();
      setProjects(data);
    } catch (error) {
      console.error('Erro ao buscar projetos:', error);
    } finally {
      setLoading(false);
    }
  };

  const getStatusColor = (status) => {
    switch (status) {
      case 'completed':
        return 'bg-green-500';
      case 'running':
        return 'bg-blue-500';
      case 'failed':
        return 'bg-red-500';
      case 'pending':
        return 'bg-yellow-500';
      default:
        return 'bg-gray-500';
    }
  };

  const getStatusText = (status) => {
    switch (status) {
      case 'completed':
        return 'Concluído';
      case 'running':
        return 'Treinando';
      case 'failed':
        return 'Falhou';
      case 'pending':
        return 'Pendente';
      case 'cancelled':
        return 'Cancelado';
      default:
        return 'Desconhecido';
    }
  };

  const handleStartTraining = async (projectId) => {
    try {
      await fetch(`/api/projects/${projectId}/start-training`, {
        method: 'POST',
      });
      fetchProjects(); // Refresh projects
    } catch (error) {
      console.error('Erro ao iniciar treinamento:', error);
    }
  };

  const handleStopTraining = async (projectId) => {
    try {
      await fetch(`/api/projects/${projectId}/stop-training`, {
        method: 'POST',
      });
      fetchProjects(); // Refresh projects
    } catch (error) {
      console.error('Erro ao parar treinamento:', error);
    }
  };

  const handleDeleteProject = async (projectId) => {
    if (window.confirm('Tem certeza que deseja excluir este projeto?')) {
      try {
        await fetch(`/api/projects/${projectId}`, {
          method: 'DELETE',
        });
        fetchProjects(); // Refresh projects
      } catch (error) {
        console.error('Erro ao excluir projeto:', error);
      }
    }
  };

  if (loading) {
    return (
      <div className="flex items-center justify-center h-64">
        <div className="text-lg">Carregando projetos...</div>
      </div>
    );
  }

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex justify-between items-center">
        <div>
          <h1 className="text-3xl font-bold">Dashboard LoRA</h1>
          <p className="text-gray-600 mt-2">
            Gerencie seus projetos de treinamento LoRA
          </p>
        </div>
        <Button onClick={onCreateProject} className="flex items-center gap-2">
          <Plus className="w-4 h-4" />
          Novo Projeto
        </Button>
      </div>

      {/* Stats Cards */}
      <div className="grid grid-cols-1 md:grid-cols-4 gap-4">
        <Card>
          <CardHeader className="pb-2">
            <CardTitle className="text-sm font-medium">Total de Projetos</CardTitle>
          </CardHeader>
          <CardContent>
            <div className="text-2xl font-bold">{projects.length}</div>
          </CardContent>
        </Card>
        <Card>
          <CardHeader className="pb-2">
            <CardTitle className="text-sm font-medium">Em Treinamento</CardTitle>
          </CardHeader>
          <CardContent>
            <div className="text-2xl font-bold">
              {projects.filter(p => p.status === 'running').length}
            </div>
          </CardContent>
        </Card>
        <Card>
          <CardHeader className="pb-2">
            <CardTitle className="text-sm font-medium">Concluídos</CardTitle>
          </CardHeader>
          <CardContent>
            <div className="text-2xl font-bold">
              {projects.filter(p => p.status === 'completed').length}
            </div>
          </CardContent>
        </Card>
        <Card>
          <CardHeader className="pb-2">
            <CardTitle className="text-sm font-medium">Falharam</CardTitle>
          </CardHeader>
          <CardContent>
            <div className="text-2xl font-bold">
              {projects.filter(p => p.status === 'failed').length}
            </div>
          </CardContent>
        </Card>
      </div>

      {/* Projects List */}
      <div className="space-y-4">
        <h2 className="text-xl font-semibold">Projetos Recentes</h2>
        
        {projects.length === 0 ? (
          <Card>
            <CardContent className="flex flex-col items-center justify-center py-12">
              <div className="text-gray-500 text-center">
                <h3 className="text-lg font-medium mb-2">Nenhum projeto encontrado</h3>
                <p className="mb-4">Crie seu primeiro projeto LoRA para começar</p>
                <Button onClick={onCreateProject} className="flex items-center gap-2">
                  <Plus className="w-4 h-4" />
                  Criar Primeiro Projeto
                </Button>
              </div>
            </CardContent>
          </Card>
        ) : (
          <div className="grid grid-cols-1 lg:grid-cols-2 gap-4">
            {projects.map((project) => (
              <Card key={project.id} className="hover:shadow-lg transition-shadow">
                <CardHeader>
                  <div className="flex justify-between items-start">
                    <div>
                      <CardTitle className="text-lg">{project.name}</CardTitle>
                      <CardDescription className="mt-1">
                        {project.description || 'Sem descrição'}
                      </CardDescription>
                    </div>
                    <Badge className={getStatusColor(project.status)}>
                      {getStatusText(project.status)}
                    </Badge>
                  </div>
                </CardHeader>
                <CardContent className="space-y-4">
                  <div className="text-sm text-gray-600">
                    <div>Modelo Base: {project.base_model}</div>
                    <div>Rank: {project.rank} | Alpha: {project.alpha}</div>
                    <div>Épocas: {project.current_epoch || 0}/{project.num_epochs}</div>
                  </div>

                  {project.status === 'running' && (
                    <div className="space-y-2">
                      <div className="flex justify-between text-sm">
                        <span>Progresso</span>
                        <span>{Math.round((project.progress || 0) * 100)}%</span>
                      </div>
                      <Progress value={(project.progress || 0) * 100} />
                      {project.current_loss && (
                        <div className="text-sm text-gray-600">
                          Loss atual: {project.current_loss.toFixed(4)}
                        </div>
                      )}
                    </div>
                  )}

                  <div className="flex gap-2 flex-wrap">
                    <Button
                      variant="outline"
                      size="sm"
                      onClick={() => onViewProject(project.id)}
                      className="flex items-center gap-1"
                    >
                      <Eye className="w-3 h-3" />
                      Ver
                    </Button>

                    {project.status === 'pending' || project.status === 'failed' ? (
                      <Button
                        size="sm"
                        onClick={() => handleStartTraining(project.id)}
                        className="flex items-center gap-1"
                      >
                        <Play className="w-3 h-3" />
                        Iniciar
                      </Button>
                    ) : project.status === 'running' ? (
                      <Button
                        variant="destructive"
                        size="sm"
                        onClick={() => handleStopTraining(project.id)}
                        className="flex items-center gap-1"
                      >
                        <Pause className="w-3 h-3" />
                        Parar
                      </Button>
                    ) : project.status === 'completed' ? (
                      <Button
                        variant="outline"
                        size="sm"
                        className="flex items-center gap-1"
                      >
                        <Download className="w-3 h-3" />
                        Download
                      </Button>
                    ) : null}

                    {project.status !== 'running' && (
                      <Button
                        variant="outline"
                        size="sm"
                        onClick={() => handleDeleteProject(project.id)}
                        className="flex items-center gap-1 text-red-600 hover:text-red-700"
                      >
                        <Trash2 className="w-3 h-3" />
                        Excluir
                      </Button>
                    )}
                  </div>
                </CardContent>
              </Card>
            ))}
          </div>
        )}
      </div>
    </div>
  );
};

export default Dashboard;