import os
import json
import time
import uuid
import logging
import hashlib
from typing import List, Dict, Optional, Any
from pydantic import BaseModel, Field
from pathlib import Path
from fastapi import APIRouter, Depends
from .auth_guard import require_role, AuthRole

_logger = logging.getLogger("api.plugins")

router = APIRouter(prefix="/api/plugins", tags=["plugins"], dependencies=[Depends(require_role(AuthRole.MACHINE))])

class PluginPermission(str):
    FS_READ = "fs:read"
    FS_WRITE = "fs:write"
    NET_API = "net:api"
    SHELL_LIMITED = "shell:limited"

class PluginManifest(BaseModel):
    id: str
    name: str
    version: str
    description: Optional[str] = None
    author: Optional[str] = None
    permissions: List[str] = []
    dependencies: Dict[str, str] = {}
    entry_point: str = "main.py"
    signature: Optional[str] = None

class Plugin(BaseModel):
    manifest: PluginManifest
    code: str
    registered_at: int = Field(default_factory=lambda: int(time.time()))
    status: str = "active" # active, disabled, error

PLUGINS_REGISTRY: Dict[str, Plugin] = {}

class PluginManager:
    """
    ARCH-E3.3: Plugin System sandboxato
    Gestisce il ciclo di vita dei plugin e la loro esecuzione sicura.
    """
    
    @staticmethod
    def _verify_signature(manifest: PluginManifest, code: str) -> bool:
        """Verifica l'integrità del plugin tramite hash del codice."""
        if not manifest.signature:
            return True # In dev mode accettiamo senza firma
        actual_hash = hashlib.sha256(code.encode()).hexdigest()
        return actual_hash == manifest.signature

    @staticmethod
    async def register(manifest_dict: dict, code: str) -> Dict[str, Any]:
        """Registra un nuovo plugin nel sistema."""
        try:
            manifest = PluginManifest(**manifest_dict)
            
            if not PluginManager._verify_signature(manifest, code):
                return {"status": "error", "message": "Firma del plugin non valida o codice corrotto"}
            
            plugin = Plugin(manifest=manifest, code=code)
            PLUGINS_REGISTRY[manifest.id] = plugin
            
            _logger.info(f"Plugin registrato: {manifest.id} v{manifest.version}")
            return {"status": "registered", "id": manifest.id, "version": manifest.version}
        except Exception as e:
            _logger.error(f"Errore registrazione plugin: {e}")
            return {"status": "error", "message": str(e)}

    @staticmethod
    async def list_plugins() -> List[Dict[str, Any]]:
        """Elenca tutti i plugin registrati e il loro stato."""
        return [
            {
                "id": p.manifest.id,
                "name": p.manifest.name,
                "version": p.manifest.version,
                "status": p.status,
                "permissions": p.manifest.permissions
            } for p in PLUGINS_REGISTRY.values()
        ]

    @staticmethod
    async def execute(plugin_id: str, input_data: Any, session_id: str = "default") -> Dict[str, Any]:
        """
        Esegue un plugin in una sandbox sicura.
        Applica restrizioni basate sui permessi del manifest.
        """
        if plugin_id not in PLUGINS_REGISTRY:
            return {"status": "error", "message": f"Plugin {plugin_id} non trovato"}
        
        plugin = PLUGINS_REGISTRY[plugin_id]
        if plugin.status != "active":
            return {"status": "error", "message": f"Plugin {plugin_id} è in stato: {plugin.status}"}

        # Preparazione dell'ambiente di esecuzione (Sandbox)
        # Sfrutta backend/api/exec_sandbox.py
        try:
            from .exec_sandbox import run_in_sandbox_session
            
            # Wrapper del codice per iniettare input e catturare output
            # Il plugin deve definire una funzione 'main(input_data)'
            execution_wrapper = f"""
import json
import sys

# Input data iniettato
input_data = {json.dumps(input_data)}

# Codice del plugin
{plugin.code}

# Esecuzione
try:
    if 'main' in globals():
        result = main(input_data)
        print("---PLUGIN_RESULT_START---")
        print(json.dumps(result))
        print("---PLUGIN_RESULT_END---")
    else:
        print("Error: La funzione 'main(input_data)' non è definita nel plugin.", file=sys.stderr)
except Exception as e:
    print(f"Plugin Execution Error: {{e}}", file=sys.stderr)
    sys.exit(1)
"""
            
            # TODO: In futuro, iniettare proxy limitati per FS/NET in base ai permessi
            # Per ora usiamo la sandbox standard che è già isolata
            
            res = await run_in_sandbox_session(
                code=execution_wrapper,
                lang="python",
                session_id=f"plugin_{plugin_id}_{session_id}",
                timeout=60.0
            )
            
            # Parsing del risultato dall'output standard
            stdout = res.get("stdout", "")
            if "---PLUGIN_RESULT_START---" in stdout:
                try:
                    parts = stdout.split("---PLUGIN_RESULT_START---")[1].split("---PLUGIN_RESULT_END---")
                    plugin_output = json.loads(parts[0].strip())
                    return {
                        "status": "success",
                        "plugin_id": plugin_id,
                        "output": plugin_output,
                        "logs": stdout.split("---PLUGIN_RESULT_START---")[0]
                    }
                except Exception as e:
                    return {"status": "error", "message": f"Errore parsing output plugin: {e}", "raw_stdout": stdout}
            
            return {
                "status": "error" if res.get("returncode") != 0 else "completed_no_output",
                "plugin_id": plugin_id,
                "returncode": res.get("returncode"),
                "stderr": res.get("stderr"),
                "stdout": stdout
            }
            
        except Exception as e:
            _logger.error(f"Errore esecuzione plugin {plugin_id}: {e}")
            return {"status": "error", "message": str(e)}

# Singleton
plugin_manager = PluginManager()

# ── HTTP Endpoints ─────────────────────────────────────────────────────────────

class RegisterPluginRequest(BaseModel):
    manifest: dict
    code: str

class ExecutePluginRequest(BaseModel):
    plugin_id: str
    input_data: Any
    session_id: Optional[str] = "default"

@router.post("/register")
async def http_register_plugin(req: RegisterPluginRequest):
    return await plugin_manager.register(req.manifest, req.code)

@router.get("/list")
async def http_list_plugins():
    return await plugin_manager.list_plugins()

@router.post("/execute")
async def http_execute_plugin(req: ExecutePluginRequest):
    return await plugin_manager.execute(req.plugin_id, req.input_data, req.session_id)

@router.get("/health/{plugin_id}")
async def http_plugin_health(plugin_id: str):
    if plugin_id not in PLUGINS_REGISTRY:
        return {"status": "not_found"}
    p = PLUGINS_REGISTRY[plugin_id]
    return {
        "status": p.status,
        "id": p.manifest.id,
        "version": p.manifest.version,
        "uptime": int(time.time()) - p.registered_at
    }