"""
Interface Gradio moderna para o AgentPDF com tema escuro.

Esta interface replica o design moderno da imagem fornecida.
"""

import os
import shutil
import gradio as gr
from typing import List, Tuple, Optional

from main_graph import get_agent_graph, process_pdf_file, ask_pdf_question
from utils.config import Config
from utils.logger import main_logger


class ModernAgentPDFInterface:
    """Interface moderna para o AgentPDF."""
    
    def __init__(self):
        """Inicializa a interface."""
        self.current_state = None
        self.chat_history = []
        self.pdf_processed = False
        self.current_pdf_name = None
        
    def upload_pdf(self, file) -> Tuple[str, str, List[List[str]]]:
        """Processa o upload de um arquivo PDF."""
        try:
            if file is None:
                return "❌ Erro: Nenhum arquivo selecionado", "Selecione um arquivo PDF", []
            
            if not file.name.lower().endswith('.pdf'):
                return "❌ Erro: Formato inválido", "Apenas arquivos PDF são aceitos", []
            
            # Processa o arquivo
            upload_dir = Config.UPLOAD_DIR
            os.makedirs(upload_dir, exist_ok=True)
            
            filename = f"uploaded_{os.path.basename(file.name)}"
            pdf_path = os.path.join(upload_dir, filename)
            shutil.copy2(file.name, pdf_path)
            
            # Processa o PDF
            result = process_pdf_file(pdf_path)
            
            if result["success"]:
                self.current_state = result["result"]
                self.pdf_processed = True
                self.current_pdf_name = os.path.basename(file.name)
                self.chat_history = []
                
                welcome_message = [
                    ["Sistema", f"✅ PDF '{self.current_pdf_name}' processado com sucesso!"]
                ]
                
                return (
                    "✅ Documento processado",
                    f"PDF: {self.current_pdf_name}\nStatus: Pronto para perguntas",
                    welcome_message
                )
            else:
                self.pdf_processed = False
                return "❌ Erro no processamento", f"Erro: {result['error']}", []
                
        except Exception as e:
            main_logger.error(f"Erro no upload: {e}")
            return "❌ Erro inesperado", f"Erro: {str(e)}", []
    
    def chat_with_pdf(self, message: str, history: List[List[str]]) -> Tuple[List[List[str]], str]:
        """Processa uma mensagem do chat."""
        try:
            if not self.pdf_processed or not self.current_state:
                error_msg = "❌ Faça upload de um PDF primeiro"
                history.append([message, error_msg])
                return history, ""
            
            if not message.strip():
                return history, ""
            
            # Processa a pergunta
            result = ask_pdf_question(message, self.current_state)
            
            if result["success"]:
                answer = result["answer"]
                if result.get("result"):
                    self.current_state = result["result"]
            else:
                answer = f"❌ Erro: {result['error']}"
            
            history.append([message, answer])
            return history, ""
            
        except Exception as e:
            main_logger.error(f"Erro no chat: {e}")
            error_msg = f"❌ Erro inesperado: {str(e)}"
            history.append([message, error_msg])
            return history, ""
    
    def clear_chat(self) -> Tuple[List, str]:
        """Limpa o histórico do chat."""
        self.chat_history = []
        return [], ""
    
    def get_pdf_info(self) -> str:
        """Retorna informações sobre o PDF atual."""
        if not self.pdf_processed or not self.current_pdf_name:
            return "Nenhum documento carregado"
        
        info = f"📄 {self.current_pdf_name}\n"
        info += f"✅ Processado e indexado\n"
        
        if self.current_state:
            chunks = self.current_state.get("pdf_chunks", [])
            if chunks:
                info += f"📊 {len(chunks)} seções"
        
        return info
    
    def create_interface(self) -> gr.Blocks:
        """Cria a interface moderna usando templates nativos do Gradio."""

        # CSS simples e limpo
        css = """
        .chat-container {
            height: 70vh !important;
        }

        .send-button {
            height: 56px !important;
            min-height: 56px !important;
        }

        .sidebar-config {
            max-width: 320px !important;
            min-width: 320px !important;
            width: 320px !important;
        }
        """

        with gr.Blocks(
            title="AgentPDF",
            theme=gr.themes.Soft(
                primary_hue="blue",
                secondary_hue="slate",
                neutral_hue="slate"
            ),
            css=css
        ) as interface:

            with gr.Row():
                # SIDEBAR - Configurações
                with gr.Column(scale=1, elem_classes=["sidebar-config"]):
                    gr.Markdown("## ⚙️ Configurações")

                    with gr.Group():
                        file_upload = gr.File(
                            label="Selecione um PDF",
                            file_types=[".pdf"],
                            type="filepath"
                        )

                        upload_btn = gr.Button(
                            "🚀 Processar PDF",
                            variant="primary",
                            size="lg"
                        )

                    with gr.Group():
                        upload_status = gr.Textbox(
                            label="📊 Status",
                            interactive=False,
                            placeholder="Aguardando upload...",
                            lines=1
                        )

                        pdf_info = gr.Textbox(
                            label="📄 Informações",
                            interactive=False,
                            value="Nenhum documento carregado",
                            lines=2
                        )


                # ÁREA PRINCIPAL - Chat
                with gr.Column(scale=3):
                    gr.Markdown("## 💬 Conversa")

                    chatbot = gr.Chatbot(
                        elem_classes=["chat-container"],
                        show_copy_button=True,
                        bubble_full_width=False
                    )

                    with gr.Row():
                        msg_input = gr.Textbox(
                            placeholder="Digite sua pergunta sobre o PDF...",
                            show_label=False,
                            scale=5,
                            lines=1
                        )

                        send_btn = gr.Button(
                            "📤",
                            variant="primary",
                            scale=1,
                            elem_classes=["send-button"]
                        )

            # Eventos da interface
            upload_btn.click(
                fn=self.upload_pdf,
                inputs=[file_upload],
                outputs=[upload_status, pdf_info, chatbot],
                show_progress=True
            )

            send_btn.click(
                fn=self.chat_with_pdf,
                inputs=[msg_input, chatbot],
                outputs=[chatbot, msg_input],
                show_progress=True
            )

            msg_input.submit(
                fn=self.chat_with_pdf,
                inputs=[msg_input, chatbot],
                outputs=[chatbot, msg_input],
                show_progress=True
            )

        return interface


def create_modern_gradio_app() -> gr.Blocks:
    """Cria a aplicação Gradio moderna."""
    interface = ModernAgentPDFInterface()
    return interface.create_interface()


if __name__ == "__main__":
    app = create_modern_gradio_app()
    app.launch(
        server_name="0.0.0.0",
        server_port=Config.GRADIO_PORT,
        share=Config.GRADIO_SHARE,
        show_error=True
    )