from __future__ import annotations
import os
from functools import lru_cache
from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    # Odoo
    odoo_url: str = 'http://localhost:8069'
    odoo_db: str = 'odoo'
    odoo_api_key: str = ''

    # Ollama
    ollama_url: str = 'http://localhost:11434'
    ollama_model: str = 'llama3'
    ollama_timeout: int = 120
    ollama_max_concurrent: int = 2

    # Anthropic / Claude
    anthropic_api_key: str = ''
    claude_model: str = 'claude-sonnet-4-6'
    claude_timeout: int = 120
    claude_max_concurrent: int = 2

    # Privacy
    llm_privacy_mode: str = 'local'  # local | hybrid | cloud

    # Per-agent backend overrides (env: AGENT_BACKEND_FINANCE=claude)
    agent_backend_finance: str = ''
    agent_backend_accounting: str = ''
    agent_backend_crm: str = ''
    agent_backend_sales: str = ''
    agent_backend_project: str = ''
    agent_backend_elearning: str = ''
    agent_backend_expenses: str = ''
    agent_backend_employees: str = ''

    # Service
    agent_service_port: int = 8001
    webhook_secret: str = ''
    allowed_callback_ip: str = ''

    # Postgres
    postgres_host: str = 'localhost'
    postgres_port: int = 5432
    postgres_db: str = 'activeblue_ai'
    postgres_user: str = 'activeblue'
    postgres_password: str = ''
    postgres_min_connections: int = 2
    postgres_max_connections: int = 10

    # Rate limiting
    dispatch_rate_limit_per_user: int = 30  # requests per minute
    directive_timeout_minutes: int = 10

    # Logging
    log_level: str = 'INFO'
    log_format: str = 'json'
    loki_url: str = ''

    class Config:
        env_file = '.env'
        env_file_encoding = 'utf-8'

    @property
    def postgres_dsn(self) -> str:
        return (
            f'postgresql+asyncpg://{self.postgres_user}:{self.postgres_password}'
            f'@{self.postgres_host}:{self.postgres_port}/{self.postgres_db}'
        )

    @property
    def postgres_asyncpg_dsn(self) -> str:
        return (
            f'asyncpg://{self.postgres_user}:{self.postgres_password}'
            f'@{self.postgres_host}:{self.postgres_port}/{self.postgres_db}'
        )

    def agent_backend_override(self, agent_name: str) -> str:
        mapping = {
            'finance_agent': self.agent_backend_finance,
            'accounting_agent': self.agent_backend_accounting,
            'crm_agent': self.agent_backend_crm,
            'sales_agent': self.agent_backend_sales,
            'project_agent': self.agent_backend_project,
            'elearning_agent': self.agent_backend_elearning,
            'expenses_agent': self.agent_backend_expenses,
            'employees_agent': self.agent_backend_employees,
        }
        return mapping.get(agent_name, '')


@lru_cache(maxsize=1)
def get_settings() -> Settings:
    return Settings()