from typing import Dict, Any, Union
import json
import os
from huggingface_hub import hf_hub_download, HfApi
from huggingface_hub.utils import EntryNotFoundError, RepositoryNotFoundError

from src.core.state.session_manager import SessionManager
from src.core.builder.code_generator import CodeGenerator
from src.core.deployer.huggingface import HFDeployer
from src.core.builder.proposal_generator import proposal_generator

# Initialisation des singletons
session_manager = SessionManager()
# Note: HFDeployer est instancié à la demande pour avoir le token le plus à jour ou géré par contexte si besoin
# Pour l'instant on l'instancie à chaque déploiement.

def init_project(project_name: str, description: str, type: str = "adhoc") -> Dict[str, Any]:
    """
    Creates a new empty project.
    Args:
        project_name: Technical name (e.g. strawberry-counter, ratp-api).
        description: Tool description, or complete Technical Specification (e.g. content of a Swagger/OpenAPI JSON).
        type: 'adhoc' (pure code), 'api_wrapper' (REST).
    Returns:
        A dictionary containing the 'draft_id' required for next steps.
    """
    print(f"DEBUG [init_project]: project_name={project_name}, type={type}")
    draft = session_manager.create_draft(project_name, description, type)
    result = {
        "draft_id": draft.draft_id,
        "config": {
            "name": draft.name,
            "description": draft.description,
            "files": list(draft.code_files.keys())
        },
        "message": f"Project '{project_name}' initialized. Draft ID: {draft.draft_id}"
    }
    print(f"DEBUG [init_project]: result={result}")
    return result

def propose_implementation(project_name: str, description: str) -> Dict[str, Any]:
    """
    Uses internal AI to propose a complete implementation from a description or Swagger.
    Args:
        project_name: The project name.
        description: The description or Swagger/OpenAPI JSON.
    Returns:
        A dictionary containing the proposed Python code, detected inputs, and requirements.
        The calling agent can then validate or modify this code before calling define_logic.
    """
    print(f"DEBUG [propose_implementation]: project_name={project_name}")
    try:
        proposal = proposal_generator.generate_from_description(project_name, description)
        result = {
            "status": "success",
            "proposal": proposal,
            "message": "Implementation proposed. Please review 'python_code' and 'requirements' before calling define_logic."
        }
        print(f"DEBUG [propose_implementation]: result={result.keys()}")
        return result
    except Exception as e:
        print(f"DEBUG [propose_implementation]: error={str(e)}")
        return {"error": f"Error during generation: {str(e)}"}

def define_logic(draft_id: str, python_code: str, inputs: Union[Dict[str, str], str], output_desc: str, requirements: str = "", output_component: str = "text") -> Dict[str, Any]:
    """
    Defines the internal logic of the tool.
    Args:
        inputs: Dictionary of inputs (e.g. {"word": "text"}). Can be a JSON string.
        output_component: Output Gradio component type (text, image, audio, video, html, json, file).
    """
    print(f"DEBUG [define_logic]: draft_id={draft_id}, output_component={output_component}")
    draft = session_manager.get_draft(draft_id)
    if not draft:
        print(f"DEBUG [define_logic]: Draft not found")
        return {"error": f"Draft {draft_id} not found."}

    # Gestion des inputs (Dict ou JSON String)
    if isinstance(inputs, str):
        try:
            inputs_dict = json.loads(inputs)
        except json.JSONDecodeError:
            print(f"DEBUG [define_logic]: Invalid JSON inputs: {inputs}")
            return {"error": "inputs must be a valid JSON string or dictionary"}
    else:
        inputs_dict = inputs

    # 1. Génération du module de l'outil (ex: tools/strawberry_counter.py)
    # On utilise le nom du projet comme nom de fichier (nettoyé)
    tool_filename = draft.name.replace("-", "_").lower()
    tool_module_code = CodeGenerator.generate_tool_module(python_code, inputs_dict, output_desc, draft.name, output_component)
    
    
    # 2. Génération de l'application maître (app.py)
    master_app_code = CodeGenerator.generate_master_app()
    
    # Sauvegarde dans le draft
    # On place l'outil dans un sous-dossier 'tools'
    session_manager.update_code(draft_id, f"tools/{tool_filename}.py", tool_module_code)
    session_manager.update_code(draft_id, "tools/__init__.py", "") # Package marker
    session_manager.update_code(draft_id, "app.py", master_app_code)
    
    # Mise à jour des requirements
    current_reqs = draft.code_files.get("requirements.txt", "")
    new_reqs = current_reqs
    
    # Ajout de gradio si manquant
    if "gradio" not in new_reqs:
        new_reqs += "\ngradio"
        
    # Ajout des requirements spécifiques demandés par le LLM
    if requirements:
        # requirements peut être une liste ou une chaine (si via UI Textbox)
        if isinstance(requirements, list):
            req_list = requirements
        elif isinstance(requirements, str):
            requirements = requirements.strip()
            # Tentative de parsing JSON (cas où ça vient de gr.Code/JSON)
            try:
                parsed = json.loads(requirements)
                if isinstance(parsed, list):
                    req_list = parsed
                else:
                    # Si c'est un JSON valide mais pas une liste, on considère comme string unique
                    req_list = [str(parsed)]
            except json.JSONDecodeError:
                # Fallback: format CSV classique "req1, req2"
                req_list = [r.strip() for r in requirements.split(",") if r.strip()]
        else:
            req_list = []
            
        for req in req_list:
            req_clean = str(req).strip()
            if req_clean and req_clean not in new_reqs:
                new_reqs += f"\n{req_clean}"
    
    draft.code_files["requirements.txt"] = new_reqs.strip()

    return {
        "status": "success",
        "message": f"Logic generated for '{draft.name}'. Ready to deploy.",
        "preview": tool_module_code[:200] + "..." 
    }


def deploy_to_space(draft_id: str, visibility: str = "public", space_target: str = "new", target_space_name: str = "") -> Dict[str, Any]:
    """
    Deploys the project to Hugging Face Spaces.
    """
    print(f"DEBUG [deploy_to_space]: draft_id={draft_id}, target={space_target}, name={target_space_name}")
    draft = session_manager.get_draft(draft_id)
    if not draft:
        return {"error": f"Draft {draft_id} not found."}

    deployer = HFDeployer()
    
    # Logique de détermination de la cible (Toolbox Centralisée vs Nouveau Space)
    
    default_space_env = os.environ.get("DEFAULT_SPACE")
    
    if target_space_name:
        final_space_name = target_space_name
    elif default_space_env:
        final_space_name = default_space_env
        print(f"DEBUG: Using DEFAULT_SPACE env var: {final_space_name}")
        space_target = "existing" 
    else:
        final_space_name = draft.name
        
    # Filtrage des fichiers à déployer
    files_to_deploy = draft.code_files.copy()
    
    # Si on ajoute à un space existant, on n'écrase pas le loader principal (app.py)
    if space_target == "existing":
        #if "app.py" in files_to_deploy:
        #    del files_to_deploy["app.py"]
            
        # Fusion intelligente des requirements
        if "requirements.txt" in files_to_deploy:
            new_reqs = set(files_to_deploy["requirements.txt"].splitlines())
            
            # Reconstruction du repo_id complet si nécessaire
            repo_id_to_fetch = final_space_name
            if "/" not in repo_id_to_fetch:
                 hf_user = os.environ.get("HF_USER")
                 if not hf_user:
                     # Tentative de récupération du user via l'API si non configuré
                     try:
                         user_info = deployer.api.whoami()
                         if user_info and "name" in user_info:
                             hf_user = user_info["name"]
                     except:
                         pass

                 if hf_user:
                     repo_id_to_fetch = f"{hf_user}/{final_space_name}"
            
            import requests
            existing_reqs = set()
            fetch_success = False

            # Méthode 1: Via API HuggingFace (hf_hub_download)
            try:
                print(f"DEBUG: Tentative de récupération des requirements via API sur {repo_id_to_fetch}...")
                cached_path = hf_hub_download(
                    repo_id=repo_id_to_fetch,
                    filename="requirements.txt",
                    repo_type="space",
                    token=deployer.token
                )
                with open(cached_path, 'r') as f:
                    existing_reqs = set(f.read().splitlines())
                fetch_success = True
                print(f"DEBUG: Requirements récupérés via API ({len(existing_reqs)} items).")
            except (EntryNotFoundError, RepositoryNotFoundError):
                print("DEBUG: Pas de requirements.txt via API (404/Not Found).")
            except Exception as e:
                print(f"DEBUG: Erreur API lors de la récupération requirements: {e}")

            # Méthode 2: Via URL directe (Fallback "Raw")
            # Utile si l'API échoue ou si le cache local est incohérent
            if not fetch_success and "/" in repo_id_to_fetch:
                try:
                    raw_url = f"https://huggingface.co/spaces/{repo_id_to_fetch}/resolve/main/requirements.txt"
                    print(f"DEBUG: Tentative de récupération via URL Raw: {raw_url}")
                    headers = {}
                    if deployer.token:
                        headers["Authorization"] = f"Bearer {deployer.token}"
                    
                    resp = requests.get(raw_url, headers=headers)
                    if resp.status_code == 200:
                        existing_reqs = set(resp.text.splitlines())
                        fetch_success = True
                        print(f"DEBUG: Requirements récupérés via URL Raw ({len(existing_reqs)} items).")
                    elif resp.status_code == 404:
                         print("DEBUG: requirements.txt non trouvé via URL Raw (404).")
                    else:
                         print(f"DEBUG: Erreur HTTP {resp.status_code} lors de la récupération via URL Raw.")
                except Exception as e:
                    print(f"DEBUG: Exception lors de la récupération via URL Raw: {e}")

            # Fusion finale
            if fetch_success or existing_reqs:
                merged_reqs = existing_reqs.union(new_reqs)
                # Nettoyage
                cleaned_reqs = sorted([r.strip() for r in merged_reqs if r.strip()])
                files_to_deploy["requirements.txt"] = "\n".join(cleaned_reqs)
                print(f"DEBUG: Fusion terminée. Total requirements: {len(cleaned_reqs)}")
            else:
                print("DEBUG: Aucun requirements existant trouvé, déploiement des nouveaux uniquement.")
            
    try:
        url = deployer.deploy_space(
            space_name=final_space_name,
            files=files_to_deploy,
            sdk="gradio",
            private=(visibility == "private")
        )
        
        mode_msg = "added to toolbox" if space_target == "existing" else "deployed (new space)"
        
        # Standard MCP URL for Gradio
        mcp_endpoint = url.rstrip("/") + "/gradio_api/mcp/"
        
        # Nom du serveur pour la config Claude (nom du Space sans le username)
        # Ex: alihmaou/mymcpserver -> mymcpserver
        if "/" in final_space_name:
             server_name = final_space_name.split("/")[-1]
        else:
             server_name = final_space_name

        # Configuration pour Claude Desktop utilisant mcp-remote (via npx)
        claude_config = f"""
        {{
          "mcpServers": {{
            "{server_name}": {{
              "command": "npx",
              "args": [
                "mcp-remote",
                "{mcp_endpoint}",
                "--transport",
                "streamable-http"
              ]
            }}
          }}
        }}
        """
        
        return {
            "status": "success",
            "url": url,
            "instructions": f"Tool '{draft.name}' {mode_msg} !",
            "claude_config": claude_config
        }
    except Exception as e:
        return {"error": f"Deployment error: {str(e)}"}

def delete_tool(space_name: str, tool_name: str) -> Dict[str, Any]:
    """
    Deletes a tool from an existing Space.
    Args:
        space_name: Full Space name (e.g. user/space) or short name (if HF_USER configured).
        tool_name: Tool name (e.g. strawberry_counter).
    """
    deployer = HFDeployer()
    api = HfApi(token=deployer.token)
    
    # Repo name resolution
    repo_id = space_name
    if "/" not in repo_id:
        hf_user = os.environ.get("HF_USER")
        if hf_user:
            repo_id = f"{hf_user}/{space_name}"
            
    file_path = f"tools/{tool_name}.py"
    
    try:
        print(f"DEBUG [delete_tool]: Deleting {file_path} from {repo_id}")
        api.delete_file(
            path_in_repo=file_path,
            repo_id=repo_id,
            repo_type="space",
            commit_message=f"Delete tool {tool_name} via Meta-MCP"
        )
        return {"status": "success", "message": f"Tool '{tool_name}' deleted from '{repo_id}'."}
    except Exception as e:
        print(f"DEBUG [delete_tool]: Error: {e}")
        return {"error": f"Error during deletion: {str(e)}"}

def get_tool_code(space_name: str, tool_name: str) -> Dict[str, Any]:
    """
    Retrieves the source code of an existing tool.
    Args:
        space_name: Full Space name (e.g. user/space).
        tool_name: Tool name.
    """
    deployer = HFDeployer()
    
    repo_id = space_name
    if "/" not in repo_id:
        hf_user = os.environ.get("HF_USER")
        if hf_user:
            repo_id = f"{hf_user}/{space_name}"
            
    filename = f"tools/{tool_name}.py"
    
    try:
        print(f"DEBUG [get_tool_code]: Fetching {filename} from {repo_id}")
        path = hf_hub_download(
            repo_id=repo_id,
            filename=filename,
            repo_type="space",
            token=deployer.token
        )
        with open(path, "r") as f:
            code = f.read()
            
        return {"status": "success", "code": code}
    except Exception as e:
        print(f"DEBUG [get_tool_code]: Error: {e}")
        return {"error": f"Error reading code: {str(e)}"}