"""
Zentrale Konfiguration für BitByLaw Integration

Alle Magic Numbers und Strings sind hier zentralisiert.
"""

from typing import List, Dict
from dataclasses import dataclass
import os


# ========== Sync Configuration ==========

@dataclass
class SyncConfig:
    """Konfiguration für Sync-Operationen"""
    
    # Retry-Konfiguration
    max_retries: int = 5
    """Maximale Anzahl von Retry-Versuchen"""
    
    retry_backoff_minutes: List[int] = None
    """Exponential Backoff in Minuten: [1, 5, 15, 60, 240]"""
    
    auto_reset_hours: int = 24
    """Auto-Reset für permanently_failed Entities (in Stunden)"""
    
    # Lock-Konfiguration
    lock_ttl_seconds: int = 900  # 15 Minuten
    """TTL für distributed locks (verhindert Deadlocks)"""
    
    lock_prefix: str = "sync_lock"
    """Prefix für Redis Lock Keys"""
    
    # Validation
    validate_before_sync: bool = True
    """Validiere Entities vor dem Sync (empfohlen)"""
    
    # Change Detection
    use_rowid_change_detection: bool = True
    """Nutze rowId für Change Detection (Advoware)"""
    
    def __post_init__(self):
        if self.retry_backoff_minutes is None:
            # Default exponential backoff: 1, 5, 15, 60, 240 Minuten
            self.retry_backoff_minutes = [1, 5, 15, 60, 240]


# Singleton Instance
SYNC_CONFIG = SyncConfig()


# ========== API Configuration ==========

@dataclass
class APIConfig:
    """API-spezifische Konfiguration"""
    
    # Timeouts
    default_timeout_seconds: int = 30
    """Default Timeout für API-Calls"""
    
    long_running_timeout_seconds: int = 120
    """Timeout für lange Operations (z.B. Uploads)"""
    
    # Retry
    max_api_retries: int = 3
    """Anzahl Retries bei API-Fehlern"""
    
    retry_status_codes: List[int] = None
    """HTTP Status Codes die Retry auslösen"""
    
    # Rate Limiting
    rate_limit_enabled: bool = True
    """Aktiviere Rate Limiting"""
    
    rate_limit_calls_per_minute: int = 60
    """Max. API-Calls pro Minute"""
    
    def __post_init__(self):
        if self.retry_status_codes is None:
            # Retry bei: 408 (Timeout), 429 (Rate Limit), 500, 502, 503, 504
            self.retry_status_codes = [408, 429, 500, 502, 503, 504]


API_CONFIG = APIConfig()


# ========== Advoware Configuration ==========

@dataclass
class AdvowareConfig:
    """Advoware-spezifische Konfiguration"""
    
    # Token Management
    token_lifetime_minutes: int = 55
    """Token-Lifetime (tatsächlich 60min, aber 5min Puffer)"""
    
    token_cache_key: str = "advoware_access_token"
    """Redis Key für Token Cache"""
    
    token_timestamp_key: str = "advoware_token_timestamp"
    """Redis Key für Token Timestamp"""
    
    # Auth
    auth_url: str = "https://security.advo-net.net/api/v1/Token"
    """Advoware Auth-Endpoint"""
    
    product_id: int = 64
    """Advoware Product ID"""
    
    # Field Mapping
    readonly_fields: List[str] = None
    """Felder die nicht via PUT geändert werden können"""
    
    def __post_init__(self):
        if self.readonly_fields is None:
            # Diese Felder können nicht via PUT geändert werden
            self.readonly_fields = [
                'betNr', 'rowId', 'kommKz',  # Kommunikation: kommKz ist read-only!
                'handelsRegisterNummer', 'registergericht'  # Werden ignoriert von API
            ]


ADVOWARE_CONFIG = AdvowareConfig()


# ========== EspoCRM Configuration ==========

@dataclass
class EspoCRMConfig:
    """EspoCRM-spezifische Konfiguration"""
    
    # API
    default_page_size: int = 50
    """Default Seitengröße für Listen-Abfragen"""
    
    max_page_size: int = 200
    """Maximale Seitengröße"""
    
    # Sync Status Fields
    sync_status_field: str = "syncStatus"
    """Feldname für Sync-Status"""
    
    sync_error_field: str = "syncErrorMessage"
    """Feldname für Sync-Fehler"""
    
    sync_retry_field: str = "syncRetryCount"
    """Feldname für Retry-Counter"""
    
    # Notifications
    notification_enabled: bool = True
    """In-App Notifications aktivieren"""
    
    notification_user_id: str = "1"
    """User-ID für Notifications (Marvin)"""


ESPOCRM_CONFIG = EspoCRMConfig()


# ========== Redis Configuration ==========

@dataclass
class RedisConfig:
    """Redis-spezifische Konfiguration"""
    
    # Connection
    host: str = "localhost"
    port: int = 6379
    db: int = 1
    timeout_seconds: int = 5
    max_connections: int = 50
    
    # Behavior
    decode_responses: bool = True
    """Auto-decode bytes zu strings"""
    
    health_check_interval: int = 30
    """Health-Check Interval in Sekunden"""
    
    # Keys
    key_prefix: str = "bitbylaw"
    """Prefix für alle Redis Keys"""
    
    def get_key(self, key: str) -> str:
        """Gibt vollen Redis Key mit Prefix zurück"""
        return f"{self.key_prefix}:{key}"
    
    @classmethod
    def from_env(cls) -> 'RedisConfig':
        """Lädt Redis-Config aus Environment Variables"""
        return cls(
            host=os.getenv('REDIS_HOST', 'localhost'),
            port=int(os.getenv('REDIS_PORT', '6379')),
            db=int(os.getenv('REDIS_DB_ADVOWARE_CACHE', '1')),
            timeout_seconds=int(os.getenv('REDIS_TIMEOUT_SECONDS', '5')),
            max_connections=int(os.getenv('REDIS_MAX_CONNECTIONS', '50'))
        )


REDIS_CONFIG = RedisConfig.from_env()


# ========== Logging Configuration ==========

@dataclass
class LoggingConfig:
    """Logging-Konfiguration"""
    
    # Levels
    default_level: str = "INFO"
    """Default Log-Level"""
    
    api_level: str = "INFO"
    """Log-Level für API-Calls"""
    
    sync_level: str = "INFO"
    """Log-Level für Sync-Operations"""
    
    # Format
    log_format: str = "[{timestamp}] {level} {logger}: {message}"
    """Log-Format"""
    
    include_context: bool = True
    """Motia FlowContext in Logs einbinden"""
    
    # Performance
    log_api_timings: bool = True
    """API Call Timings loggen"""
    
    log_sync_duration: bool = True
    """Sync-Dauer loggen"""


LOGGING_CONFIG = LoggingConfig()


# ========== Calendar Sync Configuration ==========

@dataclass
class CalendarSyncConfig:
    """Konfiguration für Google Calendar Sync"""
    
    # Sync Window
    sync_days_past: int = 7
    """Tage in die Vergangenheit syncen"""
    
    sync_days_future: int = 90
    """Tage in die Zukunft syncen"""
    
    # Cron
    cron_schedule: str = "0 */15 * * * *"
    """Cron-Schedule (jede 15 Minuten)"""
    
    # Batch Size
    batch_size: int = 10
    """Anzahl Mitarbeiter pro Batch"""


CALENDAR_SYNC_CONFIG = CalendarSyncConfig()


# ========== Feature Flags ==========

@dataclass
class FeatureFlags:
    """Feature Flags für schrittweises Rollout"""
    
    # Validation
    strict_validation: bool = True
    """Strenge Validierung mit Pydantic"""
    
    # Sync Features
    kommunikation_sync_enabled: bool = False
    """Kommunikation-Sync aktivieren (noch in Entwicklung)"""
    
    document_sync_enabled: bool = False
    """Document-Sync aktivieren (noch in Entwicklung)"""
    
    # Advanced Features
    parallel_sync_enabled: bool = False
    """Parallele Sync-Operations (experimentell)"""
    
    auto_conflict_resolution: bool = False
    """Automatische Konfliktauflösung (experimentell)"""
    
    # Debug
    debug_mode: bool = False
    """Debug-Modus (mehr Logging, langsamer)"""


FEATURE_FLAGS = FeatureFlags()


# ========== Helper Functions ==========

def get_retry_delay_seconds(attempt: int) -> int:
    """
    Gibt Retry-Delay in Sekunden für gegebenen Versuch zurück.
    
    Args:
        attempt: Versuchs-Nummer (0-indexed)
        
    Returns:
        Delay in Sekunden
    """
    backoff_minutes = SYNC_CONFIG.retry_backoff_minutes
    if attempt < len(backoff_minutes):
        return backoff_minutes[attempt] * 60
    return backoff_minutes[-1] * 60


def get_lock_key(entity_type: str, entity_id: str) -> str:
    """
    Erzeugt Redis Lock-Key für Entity.
    
    Args:
        entity_type: Entity-Typ (z.B. 'cbeteiligte')
        entity_id: Entity-ID
        
    Returns:
        Redis Key
    """
    return f"{SYNC_CONFIG.lock_prefix}:{entity_type.lower()}:{entity_id}"


def is_retryable_status_code(status_code: int) -> bool:
    """
    Prüft ob HTTP Status Code Retry auslösen soll.
    
    Args:
        status_code: HTTP Status Code
        
    Returns:
        True wenn retryable
    """
    return status_code in API_CONFIG.retry_status_codes