"""
Flare – ConfigProvider
"""

from __future__ import annotations
import json, os, threading
from pathlib import Path
from typing import Any, Dict, List, Optional
import commentjson
from datetime import datetime, timezone

from pydantic import BaseModel, Field, HttpUrl, ValidationError
from utils import log
from encryption_utils import decrypt

# ============== Provider Configs ==============
class ProviderConfig(BaseModel):
    """Configuration for available providers (LLM, TTS, STT)"""
    type: str = Field(..., pattern=r"^(llm|tts|stt)$")
    name: str
    display_name: str
    requires_endpoint: bool = False
    requires_api_key: bool = True
    requires_repo_info: bool = False
    description: Optional[str] = None

class ProviderSettings(BaseModel):
    """Provider-specific settings"""
    name: str
    api_key: Optional[str] = None
    endpoint: Optional[str] = None
    settings: Dict[str, Any] = Field(default_factory=dict)

# ============== Parameter Collection ==============
class ParameterCollectionConfig(BaseModel):
    """Configuration for parameter collection behavior"""
    max_params_per_question: int = Field(2, ge=1, le=5)
    retry_unanswered: bool = True
    collection_prompt: str = ""
    
    class Config:
        extra = "allow"

# ============== Global Config ==============
class GlobalConfig(BaseModel):
    # Provider configurations
    llm_provider: ProviderSettings
    tts_provider: ProviderSettings
    stt_provider: ProviderSettings
    
    # Available providers
    providers: List[ProviderConfig] = Field(default_factory=list)
    
    # Users
    users: List["UserConfig"] = []
    
    def get_provider_config(self, provider_type: str, provider_name: str) -> Optional[ProviderConfig]:
        """Get configuration for a specific provider"""
        return next((p for p in self.providers if p.type == provider_type and p.name == provider_name), None)
    
    def get_providers_by_type(self, provider_type: str) -> List[ProviderConfig]:
        """Get all providers of a specific type"""
        return [p for p in self.providers if p.type == provider_type]
    
    def get_plain_api_key(self, provider_type: str) -> Optional[str]:
        """Get decrypted API key for a provider type"""
        provider = getattr(self, f"{provider_type}_provider", None)
        if not provider or not provider.api_key:
            return None
            
        raw_key = provider.api_key
        # If it starts with enc:, decrypt it
        if raw_key.startswith("enc:"):
            log(f"🔓 Decrypting {provider_type} API key...")
            decrypted = decrypt(raw_key)
            log(f"🔓 {provider_type} key decrypted: {'***' + decrypted[-4:] if decrypted else 'None'}")
            return decrypted
        
        log(f"🔑 {provider_type} key/path: {'***' + raw_key[-4:] if raw_key else 'None'}")
        return raw_key
    
    class Config:
        extra = "allow"

# ============== User Config ==============
class UserConfig(BaseModel):
    username: str
    password_hash: str
    salt: str

# ============== Retry / Proxy ==============
class RetryConfig(BaseModel):
    retry_count: int = Field(3, alias="max_attempts")
    backoff_seconds: int = 2
    strategy: str = Field("static", pattern=r"^(static|exponential)$")

class ProxyConfig(BaseModel):
    enabled: bool = True
    url: HttpUrl

# ============== API & Auth ==============
class APIAuthConfig(BaseModel):
    enabled: bool = False
    token_endpoint: Optional[HttpUrl] = None
    response_token_path: str = "access_token"
    token_request_body: Dict[str, Any] = Field({}, alias="body_template")
    token_refresh_endpoint: Optional[HttpUrl] = None
    token_refresh_body: Dict[str, Any] = {}

    class Config:
        extra = "allow"
        populate_by_name = True

class APIConfig(BaseModel):
    name: str
    url: HttpUrl
    method: str = Field("GET", pattern=r"^(GET|POST|PUT|PATCH|DELETE)$")
    headers: Dict[str, Any] = {}
    body_template: Dict[str, Any] = {}
    timeout_seconds: int = 10
    retry: RetryConfig = RetryConfig()
    proxy: Optional[str | ProxyConfig] = None
    auth: Optional[APIAuthConfig] = None
    response_prompt: Optional[str] = None

    class Config:
        extra = "allow"
        populate_by_name = True

# ============== Localized Content ==============
class LocalizedCaption(BaseModel):
    locale_code: str
    caption: str

class LocalizedExample(BaseModel):
    locale_code: str
    example: str

# ============== Intent / Param ==============
class ParameterConfig(BaseModel):
    name: str
    caption: List[LocalizedCaption]  # Multi-language captions
    type: str = Field(..., pattern=r"^(int|float|bool|str|string|date)$")
    required: bool = True
    variable_name: str
    extraction_prompt: Optional[str] = None
    validation_regex: Optional[str] = None
    invalid_prompt: Optional[str] = None
    type_error_prompt: Optional[str] = None
    
    def get_caption_for_locale(self, locale_code: str, default_locale: str = "tr") -> str:
        """Get caption for specific locale with fallback"""
        # Try exact match
        caption = next((c.caption for c in self.caption if c.locale_code == locale_code), None)
        if caption:
            return caption
        
        # Try default locale
        caption = next((c.caption for c in self.caption if c.locale_code == default_locale), None)
        if caption:
            return caption
        
        # Return first available or parameter name
        return self.caption[0].caption if self.caption else self.name

    def canonical_type(self) -> str:
        if self.type == "string":
            return "str"
        elif self.type == "date":
            return "str"  # Store dates as strings in ISO format
        return self.type

class IntentConfig(BaseModel):
    name: str
    caption: Optional[str] = ""
    dependencies: List[str] = []
    examples: List[LocalizedExample] = []  # Multi-language examples
    detection_prompt: Optional[str] = None
    parameters: List[ParameterConfig] = []
    action: str
    fallback_timeout_prompt: Optional[str] = None
    fallback_error_prompt: Optional[str] = None
    
    def get_examples_for_locale(self, locale_code: str) -> List[str]:
        """Get examples for specific locale"""
        return [ex.example for ex in self.examples if ex.locale_code == locale_code]

    class Config:
        extra = "allow"

# ============== Version / Project ==============
class LLMConfig(BaseModel):
    repo_id: str
    generation_config: Dict[str, Any] = {}
    use_fine_tune: bool = False
    fine_tune_zip: str = ""

class VersionConfig(BaseModel):
    id: int = Field(..., alias="version_number")
    caption: Optional[str] = ""
    published: bool = False
    general_prompt: str
    llm: Optional["LLMConfig"] = None  # Optional based on provider
    intents: List["IntentConfig"]

    class Config:
        extra = "allow"
        populate_by_name = True

class ProjectConfig(BaseModel):
    id: Optional[int] = None
    name: str
    caption: Optional[str] = ""
    enabled: bool = True
    default_locale: str = "tr"  # Changed from default_language
    supported_locales: List[str] = ["tr"]  # Changed from supported_languages
    last_version_number: Optional[int] = None
    versions: List[VersionConfig]

    class Config:
        extra = "allow"

# ============== Service Config ==============
class ServiceConfig(BaseModel):
    global_config: GlobalConfig = Field(..., alias="config")
    projects: List[ProjectConfig]
    apis: List[APIConfig]

    # runtime helpers (skip validation)
    _api_by_name: Dict[str, APIConfig] = {}

    def build_index(self):
        self._api_by_name = {a.name: a for a in self.apis}

    def get_api(self, name: str) -> APIConfig | None:
        return self._api_by_name.get(name)

# ============== Provider Singleton ==============
class ConfigProvider:
    _instance: Optional[ServiceConfig] = None
    _CONFIG_PATH = Path(__file__).parent / "service_config.jsonc"
    _lock = threading.Lock()

    @classmethod
    def get(cls) -> ServiceConfig:
        """Get cached config - thread-safe"""
        if cls._instance is None:
            with cls._lock:
                # Double-checked locking pattern
                if cls._instance is None:
                    cls._instance = cls._load()
                    cls._instance.build_index()
        return cls._instance

    @classmethod
    def reload(cls) -> ServiceConfig:
        """Force reload configuration from file - used after UI saves"""
        with cls._lock:
            log("🔄 Reloading configuration...")
            cls._instance = None
            return cls.get()
    
    @classmethod
    def update_config(cls, config_dict: dict):
        """Update the current configuration with new values"""
        if cls._instance is None:
            cls.get()
        
        # Update global config
        if 'config' in config_dict:
            for key, value in config_dict['config'].items():
                if hasattr(cls._instance.global_config, key):
                    setattr(cls._instance.global_config, key, value)
        
        # Save to file
        cls._instance.save()

    @classmethod
    def _load(cls) -> ServiceConfig:
        """Load configuration from service_config.jsonc"""
        try:
            log(f"📂 Loading config from: {cls._CONFIG_PATH}")
            
            if not cls._CONFIG_PATH.exists():
                raise FileNotFoundError(f"Config file not found: {cls._CONFIG_PATH}")
            
            with open(cls._CONFIG_PATH, 'r', encoding='utf-8') as f:
                config_data = commentjson.load(f)
            
            # Ensure required fields exist in config data
            if 'config' not in config_data:
                config_data['config'] = {}
            
            config_section = config_data['config']
            
            # Set defaults for missing fields if needed
            if 'llm_provider' not in config_section:
                config_section['llm_provider'] = {
                    "name": "spark",
                    "api_key": None,
                    "endpoint": "http://localhost:7861",
                    "settings": {}
                }
            
            if 'tts_provider' not in config_section:
                config_section['tts_provider'] = {
                    "name": "no_tts",
                    "api_key": None,
                    "endpoint": None,
                    "settings": {}
                }
                
            if 'stt_provider' not in config_section:
                config_section['stt_provider'] = {
                    "name": "no_stt",
                    "api_key": None,
                    "endpoint": None,
                    "settings": {}
                }
            
            if 'providers' not in config_section:
                config_section['providers'] = []
            
            config_section.setdefault('users', [])
            
            # Convert string body/headers to dict if needed
            for api in config_data.get('apis', []):
                if isinstance(api.get('headers'), str):
                    try:
                        api['headers'] = json.loads(api['headers'])
                    except:
                        api['headers'] = {}
                
                if isinstance(api.get('body_template'), str):
                    try:
                        api['body_template'] = json.loads(api['body_template'])
                    except:
                        api['body_template'] = {}
                
                # Handle auth section
                if api.get('auth'):
                    auth = api['auth']
                    if isinstance(auth.get('token_request_body'), str):
                        try:
                            auth['token_request_body'] = json.loads(auth['token_request_body'])
                        except:
                            auth['token_request_body'] = {}
                    if isinstance(auth.get('token_refresh_body'), str):
                        try:
                            auth['token_refresh_body'] = json.loads(auth['token_refresh_body'])
                        except:
                            auth['token_refresh_body'] = {}
            
            # Parse and validate
            cfg = ServiceConfig.model_validate(config_data)
            
            log("✅ Configuration loaded successfully")
            return cfg
            
        except FileNotFoundError:
            log(f"❌ Config file not found: {cls._CONFIG_PATH}")
            raise
        except (commentjson.JSONLibraryException, ValidationError) as e:
            log(f"❌ Config parsing/validation error: {e}")
            raise
        except Exception as e:
            log(f"❌ Unexpected error loading config: {e}")
            raise
    
    # ============== Environment Methods ==============
    @classmethod
    def update_environment(cls, env_data: dict, username: str):
        """Update environment configuration"""
        if cls._instance is None:
            cls.get()
        
        cfg = cls._instance
        timestamp = _get_iso_timestamp()
        
        # Update provider configurations
        if 'llm_provider' in env_data:
            cfg.global_config.llm_provider = ProviderSettings(**env_data['llm_provider'])
        if 'tts_provider' in env_data:
            cfg.global_config.tts_provider = ProviderSettings(**env_data['tts_provider'])
        if 'stt_provider' in env_data:
            cfg.global_config.stt_provider = ProviderSettings(**env_data['stt_provider'])
        
        # Save
        cls._save()
        
        # Log activity
        cls._log_activity("UPDATE_ENVIRONMENT", "environment", username=username)
    
    # ============== Save Method ==============
    @classmethod
    def _save(cls):
        """Save current config to file"""
        if cls._instance is None:
            return
        
        with cls._lock:
            config_dict = {
                "config": cls._instance.global_config.model_dump(exclude_none=True),
                "projects": [p.model_dump(by_alias=True) for p in cls._instance.projects],
                "apis": [a.model_dump(by_alias=True) for a in cls._instance.apis]
            }
            
            # Write to file
            with open(cls._CONFIG_PATH, 'w', encoding='utf-8') as f:
                f.write(commentjson.dumps(config_dict, indent=2, ensure_ascii=False))
            
            log("💾 Configuration saved")
    
    # ============== Activity Logging ==============
    @classmethod
    def _log_activity(cls, action: str, entity_type: str, entity_id: Any = None, 
                     entity_name: str = None, username: str = "system", details: str = None):
        """Log activity - placeholder for future implementation"""
        log(f"📝 Activity: {action} on {entity_type} by {username}")

# ============== Helper Functions ==============
def _get_iso_timestamp() -> str:
    """Get current timestamp in ISO format"""
    return datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%S.%f")[:-3] + "Z"