"""Admin API endpoints for Flare (Refactored)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Provides authentication, project, version, and API management endpoints with provider support.
"""

import os
import time
import threading
import hashlib
import bcrypt
from typing import Optional, Dict, List, Any
from datetime import datetime, timedelta, timezone
from fastapi import APIRouter, HTTPException, Depends, Query, Response, Body
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from pydantic import BaseModel, Field
import httpx
from functools import wraps

from utils.utils import verify_token, create_token, get_current_timestamp
from config.config_provider import ConfigProvider
from utils.logger import log_info, log_error, log_warning, log_debug
from utils.exceptions import (
    FlareException,
    RaceConditionError,
    ValidationError,
    ResourceNotFoundError,
    AuthenticationError,
    AuthorizationError,
    DuplicateResourceError
)
from config.config_models import VersionConfig, IntentConfig, LLMConfiguration

# ===================== Constants & Config =====================
security = HTTPBearer()
router = APIRouter(tags=["admin"])

# ===================== Decorators =====================
def handle_exceptions(func):
    """Decorator to handle exceptions consistently"""
    @wraps(func)
    async def wrapper(*args, **kwargs):
        try:
            return await func(*args, **kwargs)
        except HTTPException:
            # HTTPException'ları olduğu gibi geçir
            raise
        except FlareException:
            # Let global handlers deal with our custom exceptions
            raise
        except Exception as e:
            # Log and convert unexpected exceptions to HTTP 500
            log_error(f"❌ Unexpected error in {func.__name__}", e)
            raise HTTPException(status_code=500, detail=str(e))
    return wrapper

# ===================== Models =====================
class LoginRequest(BaseModel):
    username: str
    password: str

class LoginResponse(BaseModel):
    token: str
    username: str

class ChangePasswordRequest(BaseModel):
    current_password: str
    new_password: str

class ProviderSettingsUpdate(BaseModel):
    name: str
    api_key: Optional[str] = None
    endpoint: Optional[str] = None
    settings: Dict[str, Any] = Field(default_factory=dict)

class EnvironmentUpdate(BaseModel):
    llm_provider: ProviderSettingsUpdate
    tts_provider: ProviderSettingsUpdate
    stt_provider: ProviderSettingsUpdate
    parameter_collection_config: Optional[Dict[str, Any]] = None

class ProjectCreate(BaseModel):
    name: str
    caption: Optional[str] = ""
    icon: Optional[str] = "folder"
    description: Optional[str] = ""
    default_locale: str = "tr"
    supported_locales: List[str] = Field(default_factory=lambda: ["tr"])
    timezone: str = "Europe/Istanbul"
    region: str = "tr-TR"

class ProjectUpdate(BaseModel):
    caption: str
    icon: Optional[str] = "folder"
    description: Optional[str] = ""
    default_locale: str = "tr"
    supported_locales: List[str] = Field(default_factory=lambda: ["tr"])
    timezone: str = "Europe/Istanbul"
    region: str = "tr-TR"
    last_update_date: str

class VersionCreate(BaseModel):
    caption: str
    source_version_no: int | None = None

class IntentModel(BaseModel):
    name: str
    caption: Optional[str] = ""
    detection_prompt: str
    examples: List[Dict[str, str]] = []  # LocalizedExample format
    parameters: List[Dict[str, Any]] = []
    action: str
    fallback_timeout_prompt: Optional[str] = None
    fallback_error_prompt: Optional[str] = None

class VersionUpdate(BaseModel):
    caption: str
    general_prompt: str
    llm: Dict[str, Any]
    intents: List[IntentModel]
    last_update_date: str

class APICreate(BaseModel):
    name: str
    url: str
    method: str = "POST"
    headers: Dict[str, str] = {}
    body_template: Dict[str, Any] = {}
    timeout_seconds: int = 10
    retry: Dict[str, Any] = Field(default_factory=lambda: {"retry_count": 3, "backoff_seconds": 2, "strategy": "static"})
    proxy: Optional[str] = None
    auth: Optional[Dict[str, Any]] = None
    response_prompt: Optional[str] = None
    response_mappings: List[Dict[str, Any]] = []

class APIUpdate(BaseModel):
    url: str
    method: str
    headers: Dict[str, str]
    body_template: Dict[str, Any]
    timeout_seconds: int
    retry: Dict[str, Any]
    proxy: Optional[str]
    auth: Optional[Dict[str, Any]]
    response_prompt: Optional[str]
    response_mappings: List[Dict[str, Any]] = []
    last_update_date: str

class TestRequest(BaseModel):
    test_type: str  # "all", "ui", "backend", "integration", "spark"

# ===================== Auth Endpoints =====================
@router.post("/login", response_model=LoginResponse)
@handle_exceptions
async def login(request: LoginRequest):
    """User login endpoint"""
    cfg = ConfigProvider.get()

    # Find user
    user = next((u for u in cfg.global_config.users if u.username == request.username), None)
    if not user:
        raise HTTPException(status_code=401, detail="Invalid credentials")

    # Verify password - Try both bcrypt and SHA256 for backward compatibility
    password_valid = False

    # First try bcrypt (new format)
    try:
        if user.password_hash.startswith("$2b$") or user.password_hash.startswith("$2a$"):
            password_valid = bcrypt.checkpw(request.password.encode('utf-8'), user.password_hash.encode('utf-8'))
    except:
        pass

    # If not valid, try SHA256 (old format)
    if not password_valid:
        sha256_hash = hashlib.sha256(request.password.encode('utf-8')).hexdigest()
        password_valid = (user.password_hash == sha256_hash)

    if not password_valid:
        raise HTTPException(status_code=401, detail="Invalid credentials")

    # Create token
    token = create_token(request.username)

    log_info(f"✅ User '{request.username}' logged in successfully")
    return LoginResponse(token=token, username=request.username)

@router.post("/change-password")
@handle_exceptions
async def change_password(
    request: ChangePasswordRequest,
    username: str = Depends(verify_token)
):
    """Change user password"""
    cfg = ConfigProvider.get()

    # Find user
    user = next((u for u in cfg.global_config.users if u.username == username), None)
    if not user:
        raise HTTPException(status_code=404, detail="User not found")

    # Verify current password - Try both bcrypt and SHA256 for backward compatibility
    password_valid = False

    # First try bcrypt (new format)
    try:
        if user.password_hash.startswith("$2b$") or user.password_hash.startswith("$2a$"):
            password_valid = bcrypt.checkpw(request.current_password.encode('utf-8'), user.password_hash.encode('utf-8'))
    except:
        pass

    # If not valid, try SHA256 (old format)
    if not password_valid:
        sha256_hash = hashlib.sha256(request.current_password.encode('utf-8')).hexdigest()
        password_valid = (user.password_hash == sha256_hash)

    if not password_valid:
        raise HTTPException(status_code=401, detail="Current password is incorrect")

    # Generate new password hash (always use bcrypt for new passwords)
    salt = bcrypt.gensalt()
    new_hash = bcrypt.hashpw(request.new_password.encode('utf-8'), salt)

    # Update user
    user.password_hash = new_hash.decode('utf-8')
    user.salt = salt.decode('utf-8')

    # Save configuration via ConfigProvider
    ConfigProvider.save(cfg, username)

    log_info(f"✅ Password changed for user '{username}'")
    return {"success": True}

# ===================== Locales Endpoints =====================
@router.get("/locales")
@handle_exceptions
async def get_available_locales(username: str = Depends(verify_token)):
    """Get all system-supported locales"""
    from config.locale_manager import LocaleManager

    locales = LocaleManager.get_available_locales_with_names()

    return {
        "locales": locales,
        "default": LocaleManager.get_default_locale()
    }

@router.get("/locales/{locale_code}")
@handle_exceptions
async def get_locale_details(
    locale_code: str,
    username: str = Depends(verify_token)
):
    """Get detailed information for a specific locale"""
    from config.locale_manager import LocaleManager

    locale_info = LocaleManager.get_locale_details(locale_code)

    if not locale_info:
        raise HTTPException(status_code=404, detail=f"Locale '{locale_code}' not found")

    return locale_info

# ===================== Environment Endpoints =====================
@router.get("/environment")
@handle_exceptions
async def get_environment(username: str = Depends(verify_token)):
    """Get environment configuration with provider info"""
    cfg = ConfigProvider.get()
    env_config = cfg.global_config

    # Provider tabanlı yeni yapıyı destekle
    response = {}

    # LLM Provider
    if hasattr(env_config, 'llm_provider'):
        response["llm_provider"] = env_config.llm_provider

    # TTS Provider
    if hasattr(env_config, 'tts_provider'):
        response["tts_provider"] = env_config.tts_provider

    # STT Provider
    if hasattr(env_config, 'stt_provider'):
        response["stt_provider"] = env_config.stt_provider
    else:
        response["stt_provider"] = {
            "name": getattr(env_config, 'stt_engine', 'no_stt'),
            "api_key": getattr(env_config, 'stt_engine_api_key', None) or "",
            "endpoint": None,
            "settings": getattr(env_config, 'stt_settings', {})
        }

    # Provider listesi
    if hasattr(env_config, 'providers'):
        providers_list = []
        for provider in env_config.providers:
            providers_list.append(provider)
        response["providers"] = providers_list
    else:
        # Varsayılan provider listesi
        response["providers"] = [
            {
                "type": "llm",
                "name": "spark_cloud",
                "display_name": "Spark LLM (Cloud)",
                "requires_endpoint": True,
                "requires_api_key": True,
                "requires_repo_info": False
            },
            {
                "type": "llm",
                "name": "gpt-4o",
                "display_name": "GPT-4o",
                "requires_endpoint": True,
                "requires_api_key": True,
                "requires_repo_info": False
            },
            {
                "type": "llm",
                "name": "gpt-4o-mini",
                "display_name": "GPT-4o Mini",
                "requires_endpoint": True,
                "requires_api_key": True,
                "requires_repo_info": False
            },
            {
                "type": "tts",
                "name": "no_tts",
                "display_name": "No TTS",
                "requires_endpoint": False,
                "requires_api_key": False,
                "requires_repo_info": False
            },
            {
                "type": "tts",
                "name": "elevenlabs",
                "display_name": "ElevenLabs",
                "requires_endpoint": False,
                "requires_api_key": True,
                "requires_repo_info": False
            },
            {
                "type": "stt",
                "name": "no_stt",
                "display_name": "No STT",
                "requires_endpoint": False,
                "requires_api_key": False,
                "requires_repo_info": False
            },
            {
                "type": "stt",
                "name": "google",
                "display_name": "Google Cloud STT",
                "requires_endpoint": False,
                "requires_api_key": True,
                "requires_repo_info": False
            }
        ]

    # Parameter collection config
    if hasattr(env_config, 'parameter_collection_config'):
        response["parameter_collection_config"] = env_config.parameter_collection_config
    else:
        # Varsayılan değerler
        response["parameter_collection_config"] = {
            "max_params_per_question": 2,
            "retry_unanswered": True,
            "smart_grouping": True,
            "collection_prompt": "You are a helpful assistant collecting information from the user..."
        }

    return response

@router.put("/environment")
@handle_exceptions
async def update_environment(
    update: EnvironmentUpdate,
    username: str = Depends(verify_token)
):
    """Update environment configuration with provider validation"""
    log_info(f"📝 Updating environment config by {username}")

    cfg = ConfigProvider.get()

    # Validate LLM provider
    llm_provider_def = cfg.global_config.get_provider_config("llm", update.llm_provider.name)
    if not llm_provider_def:
        raise HTTPException(status_code=400, detail=f"Unknown LLM provider: {update.llm_provider.name}")

    if llm_provider_def.requires_api_key and not update.llm_provider.api_key:
        raise HTTPException(status_code=400, detail=f"{llm_provider_def.display_name} requires API key")

    if llm_provider_def.requires_endpoint and not update.llm_provider.endpoint:
        raise HTTPException(status_code=400, detail=f"{llm_provider_def.display_name} requires endpoint")

    # Validate TTS provider
    tts_provider_def = cfg.global_config.get_provider_config("tts", update.tts_provider.name)
    if not tts_provider_def:
        raise HTTPException(status_code=400, detail=f"Unknown TTS provider: {update.tts_provider.name}")

    if tts_provider_def.requires_api_key and not update.tts_provider.api_key:
        raise HTTPException(status_code=400, detail=f"{tts_provider_def.display_name} requires API key")

    # Validate STT provider
    stt_provider_def = cfg.global_config.get_provider_config("stt", update.stt_provider.name)
    if not stt_provider_def:
        raise HTTPException(status_code=400, detail=f"Unknown STT provider: {update.stt_provider.name}")

    if stt_provider_def.requires_api_key and not update.stt_provider.api_key:
        raise HTTPException(status_code=400, detail=f"{stt_provider_def.display_name} requires API key")

    # Update via ConfigProvider
    ConfigProvider.update_environment(update.model_dump(), username)

    log_info(f"✅ Environment updated to LLM: {update.llm_provider.name}, TTS: {update.tts_provider.name}, STT: {update.stt_provider.name} by {username}")
    return {"success": True}

# ===================== Project Endpoints =====================
@router.get("/projects/names")
@handle_exceptions
async def list_enabled_projects():
    """Get list of enabled project names for chat"""
    cfg = ConfigProvider.get()
    return [p.name for p in cfg.projects if p.enabled and not getattr(p, 'deleted', False)]

@router.get("/projects")
@handle_exceptions
async def list_projects(
    include_deleted: bool = False,
    username: str = Depends(verify_token)
):
    """List all projects"""
    cfg = ConfigProvider.get()
    projects = cfg.projects

    # Filter deleted if needed
    if not include_deleted:
        projects = [p for p in projects if not getattr(p, 'deleted', False)]

    return [p.model_dump() for p in projects]

@router.get("/projects/{project_id}")
@handle_exceptions
async def get_project(
    project_id: int,
    username: str = Depends(verify_token)
):
    """Get single project by ID"""
    project = ConfigProvider.get_project(project_id)
    if not project or getattr(project, 'deleted', False):
        raise HTTPException(status_code=404, detail="Project not found")

    return project.model_dump()

@router.post("/projects")
@handle_exceptions
async def create_project(
    project: ProjectCreate,
    username: str = Depends(verify_token)
):
    """Create new project with initial version"""
    # Validate supported locales
    from config.locale_manager import LocaleManager

    invalid_locales = LocaleManager.validate_project_languages(project.supported_locales)
    if invalid_locales:
        available_locales = LocaleManager.get_available_locales_with_names()
        available_codes = [locale['code'] for locale in available_locales]
        raise HTTPException(
            status_code=400,
            detail=f"Unsupported locales: {', '.join(invalid_locales)}. Available locales: {', '.join(available_codes)}"
        )

    # Check if default locale is in supported locales
    if project.default_locale not in project.supported_locales:
        raise HTTPException(
            status_code=400,
            detail="Default locale must be one of the supported locales"
        )

    # Debug log for project creation
    log_debug(f"🔍 Creating project '{project.name}' with default_locale: {project.default_locale}")

    new_project = ConfigProvider.create_project(project.model_dump(), username)

    # Debug log for initial version
    if new_project.versions:
        initial_version = new_project.versions[0]
        log_debug(f"🔍 Initial version created - no: {initial_version.no}, published: {initial_version.published}, type: {type(initial_version.published)}")

    log_info(f"✅ Project '{project.name}' created by {username}")
    return new_project.model_dump()

@router.put("/projects/{project_id}")
@handle_exceptions
async def update_project(
    project_id: int,
    update: ProjectUpdate,
    username: str = Depends(verify_token)
):
    """Update existing project with race condition handling"""
    log_info(f"🔍 Update request for project {project_id} by {username}")
    log_info(f"🔍 Received last_update_date: {update.last_update_date}")

    # Mevcut project'i al ve durumunu logla
    current_project = ConfigProvider.get_project(project_id)
    if current_project:
        log_info(f"🔍 Current project last_update_date: {current_project.last_update_date}")
        log_info(f"🔍 Current project last_update_user: {current_project.last_update_user}")

    # Optimistic locking kontrolü
    result = ConfigProvider.update_project(
        project_id,
        update.model_dump(),
        username,
        expected_last_update=update.last_update_date
    )

    log_info(f"✅ Project {project_id} updated by {username}")
    return result

@router.delete("/projects/{project_id}")
@handle_exceptions
async def delete_project(project_id: int, username: str = Depends(verify_token)):
    """Delete project (soft delete)"""
    ConfigProvider.delete_project(project_id, username)

    log_info(f"✅ Project deleted by {username}")
    return {"success": True}

@router.patch("/projects/{project_id}/toggle")
async def toggle_project(project_id: int, username: str = Depends(verify_token)):
    """Toggle project enabled status"""
    enabled = ConfigProvider.toggle_project(project_id, username)

    log_info(f"✅ Project {'enabled' if enabled else 'disabled'} by {username}")
    return {"enabled": enabled}

# ===================== Import/Export Endpoints =====================
@router.get("/projects/{project_id}/export")
@handle_exceptions
async def export_project(
    project_id: int,
    username: str = Depends(verify_token)
):
    """Export project as JSON"""
    project = ConfigProvider.get_project(project_id)
    if not project:
        raise HTTPException(status_code=404, detail="Project not found")

    # Prepare export data
    export_data = {
        "name": project.name,
        "caption": project.caption,
        "icon": project.icon,
        "description": project.description,
        "default_locale": project.default_locale,
        "supported_locales": project.supported_locales,
        "timezone": project.timezone,
        "region": project.region,
        "versions": []
    }

    # Add versions (only non-deleted)
    for version in project.versions:
        if not getattr(version, 'deleted', False):
            version_data = {
                "caption": version.caption,
                "description": getattr(version, 'description', ''),
                "general_prompt": version.general_prompt,
                "welcome_prompt": getattr(version, 'welcome_prompt', None),
                "llm": version.llm.model_dump() if version.llm else {},
                "intents": [intent.model_dump() for intent in version.intents]
            }
            export_data["versions"].append(version_data)

    log_info(f"✅ Project '{project.name}' exported by {username}")

    return export_data

@router.post("/projects/import")
@handle_exceptions
async def import_project(
    project_data: dict = Body(...),
    username: str = Depends(verify_token)
):
    """Import project from JSON"""
    # Validate required fields
    if not project_data.get('name'):
        raise HTTPException(status_code=400, detail="Project name is required")

    # Check for duplicate name
    cfg = ConfigProvider.get()
    if any(p.name == project_data['name'] for p in cfg.projects if not p.deleted):
        raise HTTPException(
            status_code=409,
            detail=f"Project with name '{project_data['name']}' already exists"
        )

    # Create project
    new_project_data = {
        "name": project_data['name'],
        "caption": project_data.get('caption', project_data['name']),
        "icon": project_data.get('icon', 'folder'),
        "description": project_data.get('description', ''),
        "default_locale": project_data.get('default_locale', 'tr'),
        "supported_locales": project_data.get('supported_locales', ['tr']),
        "timezone": project_data.get('timezone', 'Europe/Istanbul'),
        "region": project_data.get('region', 'tr-TR')
    }

    # Create project
    new_project = ConfigProvider.create_project(new_project_data, username)

    # Import versions
    if 'versions' in project_data and project_data['versions']:
        # Remove the initial version that was auto-created
        if new_project.versions:
            new_project.versions.clear()

        # Add imported versions
        for idx, version_data in enumerate(project_data['versions']):
            version = VersionConfig(
                no=idx + 1,
                caption=version_data.get('caption', f'Version {idx + 1}'),
                description=version_data.get('description', ''),
                published=False,  # Imported versions are unpublished
                deleted=False,
                general_prompt=version_data.get('general_prompt', ''),
                welcome_prompt=version_data.get('welcome_prompt'),
                llm=LLMConfiguration(**version_data.get('llm', {
                    'repo_id': '',
                    'generation_config': {
                        'max_new_tokens': 512,
                        'temperature': 0.7,
                        'top_p': 0.9
                    },
                    'use_fine_tune': False,
                    'fine_tune_zip': ''
                })),
                intents=[IntentConfig(**intent) for intent in version_data.get('intents', [])],
                created_date=get_current_timestamp(),
                created_by=username
            )
            new_project.versions.append(version)

        # Update version counter
        new_project.version_id_counter = len(new_project.versions) + 1

        # Save updated project
        ConfigProvider.save(cfg, username)

    log_info(f"✅ Project '{new_project.name}' imported by {username}")

    return {"success": True, "project_id": new_project.id, "project_name": new_project.name}

# ===================== Version Endpoints =====================
@router.get("/projects/{project_id}/versions")
@handle_exceptions
async def list_versions(
    project_id: int,
    include_deleted: bool = False,
    username: str = Depends(verify_token)
):
    """List project versions"""
    project = ConfigProvider.get_project(project_id)
    if not project:
        raise HTTPException(status_code=404, detail="Project not found")

    versions = project.versions

    # Filter deleted if needed
    if not include_deleted:
        versions = [v for v in versions if not getattr(v, 'deleted', False)]

    return [v.model_dump() for v in versions]

@router.post("/projects/{project_id}/versions")
@handle_exceptions
async def create_version(
    project_id: int,
    version_data: VersionCreate,
    username: str = Depends(verify_token)
):
    """Create new version"""
    new_version = ConfigProvider.create_version(project_id, version_data.model_dump(), username)

    log_info(f"✅ Version created for project {project_id} by {username}")
    return new_version.model_dump()

@router.put("/projects/{project_id}/versions/{version_no}")
@handle_exceptions
async def update_version(
    project_id: int,
    version_no: int,
    update: VersionUpdate,
    force: bool = Query(default=False, description="Force update despite conflicts"),
    username: str = Depends(verify_token)
):
    """Update version with race condition handling"""
    log_debug(f"🔍 Version update request - project: {project_id}, version: {version_no}, user: {username}")

    # Force parametresi kontrolü
    if force:
        log_warning(f"⚠️ Force update requested for version {version_no} by {username}")

    result = ConfigProvider.update_version(
        project_id,
        version_no,
        update.model_dump(),
        username,
        expected_last_update=update.last_update_date if not force else None
    )

    log_info(f"✅ Version {version_no} updated by {username}")
    return result

@router.post("/projects/{project_id}/versions/{version_no}/publish")
@handle_exceptions
async def publish_version(
    project_id: int,
    version_no: int,
    username: str = Depends(verify_token)
):
    """Publish version"""
    project, version = ConfigProvider.publish_version(project_id, version_no, username)

    log_info(f"✅ Version {version_no} published for project '{project.name}' by {username}")

    # Notify LLM provider if project is enabled and provider requires repo info
    cfg = ConfigProvider.get()
    llm_provider_def = cfg.global_config.get_provider_config("llm", cfg.global_config.llm_provider.name)

    if project.enabled and llm_provider_def and llm_provider_def.requires_repo_info:
        try:
            await notify_llm_startup(project, version)
        except Exception as e:
            log_error(f"⚠️ Failed to notify LLM provider", e)
            # Don't fail the publish

    return {"success": True}

@router.delete("/projects/{project_id}/versions/{version_no}")
@handle_exceptions
async def delete_version(
    project_id: int,
    version_no: int,
    username: str = Depends(verify_token)
):
    """Delete version (soft delete)"""
    ConfigProvider.delete_version(project_id, version_no, username)

    log_info(f"✅ Version {version_no} deleted for project {project_id} by {username}")
    return {"success": True}

@router.get("/projects/{project_name}/versions")
@handle_exceptions
async def get_project_versions(
    project_name: str,
    username: str = Depends(verify_token)
):
    """Get all versions of a project for testing"""
    cfg = ConfigProvider.get()

    # Find project
    project = next((p for p in cfg.projects if p.name == project_name), None)
    if not project:
        raise HTTPException(status_code=404, detail=f"Project '{project_name}' not found")

    # Return versions with their status
    versions = []
    for v in project.versions:
        if not getattr(v, 'deleted', False):
            versions.append({
                "version_number": v.no,
                "caption": v.caption,
                "published": v.published,
                "description": getattr(v, 'description', ''),
                "intent_count": len(v.intents),
                "created_date": getattr(v, 'created_date', None),
                "is_current": v.published  # Published version is current
            })

    return {
        "project_name": project_name,
        "project_caption": project.caption,
        "versions": versions
    }

@router.get("/projects/{project_id}/versions/{version1_id}/compare/{version2_id}")
@handle_exceptions
async def compare_versions(
    project_id: int,
    version1_no: int,
    version2_no: int,
    username: str = Depends(verify_token)
):
    """Compare two versions and return differences"""
    project = ConfigProvider.get_project(project_id)
    if not project:
        raise HTTPException(status_code=404, detail="Project not found")

    v1 = next((v for v in project.versions if v.no == version1_no), None)
    v2 = next((v for v in project.versions if v.no == version2_no), None)

    if not v1 or not v2:
        raise HTTPException(status_code=404, detail="Version not found")

    # Deep comparison
    differences = {
        'general_prompt': {
            'changed': v1.general_prompt != v2.general_prompt,
            'v1': v1.general_prompt,
            'v2': v2.general_prompt
        },
        'intents': {
            'added': [],
            'removed': [],
            'modified': []
        }
    }

    # Compare intents
    v1_intents = {i.name: i for i in v1.intents}
    v2_intents = {i.name: i for i in v2.intents}

    # Find added/removed
    differences['intents']['added'] = list(set(v2_intents.keys()) - set(v1_intents.keys()))
    differences['intents']['removed'] = list(set(v1_intents.keys()) - set(v2_intents.keys()))

    # Find modified
    for intent_name in set(v1_intents.keys()) & set(v2_intents.keys()):
        i1, i2 = v1_intents[intent_name], v2_intents[intent_name]
        if i1.model_dump() != i2.model_dump():
            differences['intents']['modified'].append({
                'name': intent_name,
                'differences': compare_intent_details(i1, i2)
            })

    log_info(
        f"Version comparison performed",
        user=username,
        project_id=project_id,
        version1_id=version1_id,
        version2_id=version2_id
    )

    return differences

# ===================== API Endpoints =====================
@router.get("/apis")
@handle_exceptions
async def list_apis(
    include_deleted: bool = False,
    username: str = Depends(verify_token)
):
    """List all APIs"""
    cfg = ConfigProvider.get()
    apis = cfg.apis

    # Filter deleted if needed
    if not include_deleted:
        apis = [a for a in apis if not getattr(a, 'deleted', False)]

    return [a.model_dump() for a in apis]

@router.post("/apis")
@handle_exceptions
async def create_api(api: APICreate, username: str = Depends(verify_token)):
    """Create new API"""
    try:
        new_api = ConfigProvider.create_api(api.model_dump(), username)

        log_info(f"✅ API '{api.name}' created by {username}")
        return new_api.model_dump()
    except DuplicateResourceError as e:
        # DuplicateResourceError'ı handle et
        raise HTTPException(status_code=409, detail=str(e))

@router.put("/apis/{api_name}")
@handle_exceptions
async def update_api(
    api_name: str,
    update: APIUpdate,
    username: str = Depends(verify_token)
):
    """Update API configuration with race condition handling"""
    result = ConfigProvider.update_api(
        api_name,
        update.model_dump(),
        username,
        expected_last_update=update.last_update_date
    )

    log_info(f"✅ API '{api_name}' updated by {username}")
    return result

@router.delete("/apis/{api_name}")
@handle_exceptions
async def delete_api(api_name: str, username: str = Depends(verify_token)):
    """Delete API (soft delete)"""
    ConfigProvider.delete_api(api_name, username)

    log_info(f"✅ API '{api_name}' deleted by {username}")
    return {"success": True}

@router.post("/validate/regex")
@handle_exceptions
async def validate_regex(
    request: dict = Body(...),
    username: str = Depends(verify_token)
):
    """Validate regex pattern"""
    pattern = request.get("pattern", "")
    test_value = request.get("test_value", "")

    import re
    compiled_regex = re.compile(pattern)
    matches = bool(compiled_regex.match(test_value))

    return {
        "valid": True,
        "matches": matches,
        "pattern": pattern,
        "test_value": test_value
    }

# ===================== Test Endpoints =====================
@router.post("/test/run-all")
@handle_exceptions
async def run_all_tests(
    request: TestRequest,
    username: str = Depends(verify_token)
):
    """Run all tests"""
    log_info(f"🧪 Running {request.test_type} tests requested by {username}")

    # TODO: Implement test runner
    # For now, return mock results
    return {
        "test_run_id": "test_" + datetime.now().isoformat(),
        "status": "running",
        "total_tests": 60,
        "completed": 0,
        "passed": 0,
        "failed": 0,
        "message": "Test run started"
    }

@router.get("/test/status/{test_run_id}")
@handle_exceptions
async def get_test_status(
    test_run_id: str,
    username: str = Depends(verify_token)
):
    """Get test run status"""
    # TODO: Implement test status tracking
    return {
        "test_run_id": test_run_id,
        "status": "completed",
        "total_tests": 60,
        "completed": 60,
        "passed": 57,
        "failed": 3,
        "duration": 340.5,
        "details": []
    }

# ===================== Activity Log =====================
@router.get("/activity-log")
@handle_exceptions
async def get_activity_log(
    limit: int = Query(100, ge=1, le=1000),
    entity_type: Optional[str] = None,
    username: str = Depends(verify_token)
):
    """Get activity log"""
    cfg = ConfigProvider.get()
    logs = cfg.activity_log

    # Filter by entity type if specified
    if entity_type:
        logs = [l for l in logs if l.entity_type == entity_type]

    # Return most recent entries
    return logs[-limit:]

# ===================== Helper Functions =====================
async def notify_llm_startup(project, version):
    """Notify LLM provider about project startup"""
    from llm.llm_factory import LLMFactory

    try:
        llm_provider = LLMFactory.create_provider()

        # Build project config for startup
        project_config = {
            "name": project.name,
            "version_no": version.no,
            "repo_id": version.llm.repo_id,
            "generation_config": version.llm.generation_config,
            "use_fine_tune": version.llm.use_fine_tune,
            "fine_tune_zip": version.llm.fine_tune_zip
        }

        success = await llm_provider.startup(project_config)
        if success:
            log_info(f"✅ LLM provider notified for project '{project.name}'")
        else:
            log_info(f"⚠️ LLM provider notification failed for project '{project.name}'")

    except Exception as e:
        log_error("❌ Error notifying LLM provider", e)
        raise

# ===================== Cleanup Task =====================
def cleanup_activity_log():
    """Cleanup old activity log entries"""
    while True:
        try:
            cfg = ConfigProvider.get()

            # Keep only last 30 days
            cutoff = datetime.now() - timedelta(days=30)
            cutoff_str = cutoff.isoformat()

            original_count = len(cfg.activity_log)
            cfg.activity_log = [
                log for log in cfg.activity_log
                if hasattr(log, 'timestamp') and str(log.timestamp) >= cutoff_str
            ]

            if len(cfg.activity_log) < original_count:
                removed = original_count - len(cfg.activity_log)
                log_info(f"🧹 Cleaned up {removed} old activity log entries")
                # ConfigProvider.save(cfg, "system") kullanmalıyız
                ConfigProvider.save(cfg, "system")

        except Exception as e:
            log_error("❌ Activity log cleanup error", e)

        # Run every hour
        time.sleep(3600)

def start_cleanup_task():
    """Start the cleanup task in background"""
    thread = threading.Thread(target=cleanup_activity_log, daemon=True)
    thread.start()
    log_info("🧹 Activity log cleanup task started")