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 { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs';
import { ArrowLeft, Play, Pause, Download, RefreshCw } from 'lucide-react';
import { LineChart, Line, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer } from 'recharts';
import '../App.css';

const ProjectView = ({ projectId, onBack }) => {
  const [project, setProject] = useState(null);
  const [logs, setLogs] = useState([]);
  const [loading, setLoading] = useState(true);
  const [refreshing, setRefreshing] = useState(false);

  useEffect(() => {
    fetchProject();
    fetchLogs();
    
    // Auto-refresh if project is running
    const interval = setInterval(() => {
      if (project?.status === 'running') {
        fetchProject();
        fetchLogs();
      }
    }, 5000);

    return () => clearInterval(interval);
  }, [projectId, project?.status]);

  const fetchProject = async () => {
    try {
      const response = await fetch(`/api/projects/${projectId}`);
      const data = await response.json();
      setProject(data);
    } catch (error) {
      console.error('Erro ao buscar projeto:', error);
    } finally {
      setLoading(false);
    }
  };

  const fetchLogs = async () => {
    try {
      const response = await fetch(`/api/projects/${projectId}/logs`);
      const data = await response.json();
      setLogs(data.logs || []);
    } catch (error) {
      console.error('Erro ao buscar logs:', error);
    }
  };

  const handleRefresh = async () => {
    setRefreshing(true);
    await fetchProject();
    await fetchLogs();
    setRefreshing(false);
  };

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

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

  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';
    }
  };

  // Generate mock training data for chart
  const generateTrainingData = () => {
    if (!project || !project.current_epoch) return [];
    
    const data = [];
    for (let i = 1; i <= project.current_epoch; i++) {
      data.push({
        epoch: i,
        loss: Math.max(0.1, 1.0 - (i / project.num_epochs) * 0.8 + (Math.random() - 0.5) * 0.1)
      });
    }
    return data;
  };

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

  if (!project) {
    return (
      <div className="flex items-center justify-center h-64">
        <div className="text-lg text-red-600">Projeto não encontrado</div>
      </div>
    );
  }

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex items-center justify-between">
        <div className="flex items-center gap-4">
          <Button variant="outline" onClick={onBack} className="flex items-center gap-2">
            <ArrowLeft className="w-4 h-4" />
            Voltar
          </Button>
          <div>
            <h1 className="text-3xl font-bold">{project.name}</h1>
            <p className="text-gray-600 mt-2">
              {project.description || 'Sem descrição'}
            </p>
          </div>
        </div>
        
        <div className="flex items-center gap-2">
          <Button
            variant="outline"
            onClick={handleRefresh}
            disabled={refreshing}
            className="flex items-center gap-2"
          >
            <RefreshCw className={`w-4 h-4 ${refreshing ? 'animate-spin' : ''}`} />
            Atualizar
          </Button>
          
          {project.status === 'pending' || project.status === 'failed' ? (
            <Button onClick={handleStartTraining} className="flex items-center gap-2">
              <Play className="w-4 h-4" />
              Iniciar Treinamento
            </Button>
          ) : project.status === 'running' ? (
            <Button
              variant="destructive"
              onClick={handleStopTraining}
              className="flex items-center gap-2"
            >
              <Pause className="w-4 h-4" />
              Parar Treinamento
            </Button>
          ) : project.status === 'completed' ? (
            <Button variant="outline" className="flex items-center gap-2">
              <Download className="w-4 h-4" />
              Download Modelo
            </Button>
          ) : null}
        </div>
      </div>

      {/* Status Card */}
      <Card>
        <CardHeader>
          <div className="flex justify-between items-center">
            <CardTitle>Status do Projeto</CardTitle>
            <Badge className={getStatusColor(project.status)}>
              {getStatusText(project.status)}
            </Badge>
          </div>
        </CardHeader>
        <CardContent>
          <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
            <div>
              <div className="text-sm text-gray-600">Modelo Base</div>
              <div className="font-medium">{project.base_model}</div>
            </div>
            <div>
              <div className="text-sm text-gray-600">Progresso</div>
              <div className="font-medium">
                Época {project.current_epoch || 0} de {project.num_epochs}
              </div>
            </div>
            <div>
              <div className="text-sm text-gray-600">Criado em</div>
              <div className="font-medium">
                {new Date(project.created_at).toLocaleDateString('pt-BR')}
              </div>
            </div>
          </div>

          {project.status === 'running' && (
            <div className="mt-4 space-y-2">
              <div className="flex justify-between text-sm">
                <span>Progresso do Treinamento</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>
          )}

          {project.error_message && (
            <div className="mt-4 p-3 bg-red-50 border border-red-200 rounded-md">
              <div className="text-sm text-red-800">
                <strong>Erro:</strong> {project.error_message}
              </div>
            </div>
          )}
        </CardContent>
      </Card>

      {/* Tabs */}
      <Tabs defaultValue="config" className="space-y-4">
        <TabsList>
          <TabsTrigger value="config">Configuração</TabsTrigger>
          <TabsTrigger value="training">Treinamento</TabsTrigger>
          <TabsTrigger value="logs">Logs</TabsTrigger>
        </TabsList>

        <TabsContent value="config" className="space-y-4">
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            <Card>
              <CardHeader>
                <CardTitle>Parâmetros LoRA</CardTitle>
              </CardHeader>
              <CardContent className="space-y-2">
                <div className="flex justify-between">
                  <span className="text-gray-600">Rank:</span>
                  <span>{project.rank}</span>
                </div>
                <div className="flex justify-between">
                  <span className="text-gray-600">Alpha:</span>
                  <span>{project.alpha}</span>
                </div>
                <div className="flex justify-between">
                  <span className="text-gray-600">Dropout:</span>
                  <span>{project.dropout}</span>
                </div>
              </CardContent>
            </Card>

            <Card>
              <CardHeader>
                <CardTitle>Parâmetros de Treinamento</CardTitle>
              </CardHeader>
              <CardContent className="space-y-2">
                <div className="flex justify-between">
                  <span className="text-gray-600">Taxa de Aprendizado:</span>
                  <span>{project.learning_rate}</span>
                </div>
                <div className="flex justify-between">
                  <span className="text-gray-600">Batch Size:</span>
                  <span>{project.batch_size}</span>
                </div>
                <div className="flex justify-between">
                  <span className="text-gray-600">Épocas:</span>
                  <span>{project.num_epochs}</span>
                </div>
              </CardContent>
            </Card>

            <Card>
              <CardHeader>
                <CardTitle>Otimizações</CardTitle>
              </CardHeader>
              <CardContent className="space-y-2">
                <div className="flex justify-between">
                  <span className="text-gray-600">Otimizador 8-bit:</span>
                  <span>{project.use_8bit_optimizer ? 'Sim' : 'Não'}</span>
                </div>
                <div className="flex justify-between">
                  <span className="text-gray-600">Gradient Checkpointing:</span>
                  <span>{project.use_gradient_checkpointing ? 'Sim' : 'Não'}</span>
                </div>
                <div className="flex justify-between">
                  <span className="text-gray-600">Precisão Mista:</span>
                  <span>{project.mixed_precision}</span>
                </div>
              </CardContent>
            </Card>

            <Card>
              <CardHeader>
                <CardTitle>Dataset</CardTitle>
              </CardHeader>
              <CardContent className="space-y-2">
                <div className="flex justify-between">
                  <span className="text-gray-600">Caminho:</span>
                  <span className="text-sm truncate">
                    {project.dataset_path || 'Não carregado'}
                  </span>
                </div>
                <div className="flex justify-between">
                  <span className="text-gray-600">Número de Imagens:</span>
                  <span>{project.num_images || 'N/A'}</span>
                </div>
              </CardContent>
            </Card>
          </div>
        </TabsContent>

        <TabsContent value="training" className="space-y-4">
          <Card>
            <CardHeader>
              <CardTitle>Gráfico de Loss</CardTitle>
              <CardDescription>
                Acompanhe a evolução da loss durante o treinamento
              </CardDescription>
            </CardHeader>
            <CardContent>
              <div className="h-64">
                <ResponsiveContainer width="100%" height="100%">
                  <LineChart data={generateTrainingData()}>
                    <CartesianGrid strokeDasharray="3 3" />
                    <XAxis dataKey="epoch" />
                    <YAxis />
                    <Tooltip />
                    <Line 
                      type="monotone" 
                      dataKey="loss" 
                      stroke="#3b82f6" 
                      strokeWidth={2}
                      dot={{ fill: '#3b82f6' }}
                    />
                  </LineChart>
                </ResponsiveContainer>
              </div>
            </CardContent>
          </Card>
        </TabsContent>

        <TabsContent value="logs" className="space-y-4">
          <Card>
            <CardHeader>
              <CardTitle>Logs de Treinamento</CardTitle>
              <CardDescription>
                Logs em tempo real do processo de treinamento
              </CardDescription>
            </CardHeader>
            <CardContent>
              <div className="bg-gray-900 text-green-400 p-4 rounded-md font-mono text-sm h-64 overflow-y-auto">
                {logs.length === 0 ? (
                  <div className="text-gray-500">Nenhum log disponível</div>
                ) : (
                  logs.map((log, index) => (
                    <div key={index} className="mb-1">
                      {log}
                    </div>
                  ))
                )}
              </div>
            </CardContent>
          </Card>
        </TabsContent>
      </Tabs>
    </div>
  );
};

export default ProjectView;