from typing import Literal

from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    app_name: str = "ClientFlow"
    env: str = "dev"

    openrouter_api_key: str
    openrouter_model: str = "qwen/qwen3-30b-a3b"
    openrouter_url: str = "https://openrouter.ai/api/v1/chat/completions"

    # Optional OpenAI Responses API used by the Phase 1 safe email reply agent.
    # When disabled or not configured, ClientFlow keeps the existing deterministic/OpenRouter flow.
    openai_api_key: str = ""
    openai_responses_url: str = "https://api.openai.com/v1/responses"
    openai_vector_store_id: str = ""

    # ClientFlow requer PostgreSQL. SQLite não suporta JSONB, UUID,
    # TIMESTAMPTZ nem os índices usados pelo schema core.
    database_url: str
    clientflow_persist: bool = True

    clientflow_webhook_secret: str = ""
    clientflow_admin_auth_mode: Literal["proxy", "token", "local"] = "proxy"
    clientflow_admin_token: str = ""

    # UI warning for cases where the original opportunity contact and the
    # linked fiscal customer look different. Disabled by default because many
    # legitimate contacts use abbreviated names or personal contacts for a
    # company/fiscal customer. Enable only if this warning proves useful.
    clientflow_customer_mismatch_warning_enabled: bool = False

    # Automatic CONFIRM_DELIVERY tasks are intentionally disabled. The normal
    # cadence starts directly with the commercial follow-up; an operator may
    # still schedule a manual delivery check from the opportunity page.
    confirm_delivery_automation_enabled: bool = False

    chatwoot_write_enabled: bool = False
    chatwoot_base_url: str = ""
    chatwoot_public_url: str = ""
    chatwoot_account_id: str = ""
    chatwoot_api_token: str = ""

    # Reply assistant: deterministic templates + optional business-aware LLM wording.
    clientflow_reply_llm_enabled: bool = False
    # When true and LLM is enabled, deterministic intent rules are used only as guardrails.
    clientflow_reply_llm_first_enabled: bool = True
    clientflow_reply_llm_model: str = ""
    clientflow_reply_llm_temperature: float = 0.2
    clientflow_reply_llm_max_tokens: int = 700
    clientflow_reply_llm_timeout_seconds: int = 20
    clientflow_reply_llm_max_context_chars: int = 5000

    # Phase 1: safe draft-only email reply agent backed by OpenAI file_search.
    clientflow_email_reply_agent_enabled: bool = False
    clientflow_email_reply_agent_model: str = "gpt-4.1-mini"
    clientflow_email_reply_agent_timeout_seconds: int = 30
    clientflow_email_reply_agent_max_results: int = 6
    clientflow_email_reply_agent_prompt_version: str = "blif-email-agent-phase1-20260613"

    # External operational systems
    odoo_enabled: bool = False
    odoo_base_url: str = ""
    odoo_public_url: str = ""
    odoo_db: str = ""
    odoo_username: str = ""
    odoo_api_key: str = ""
    odoo_api_mode: str = "xmlrpc"

    jasmin_enabled: bool = False
    jasmin_base_url: str = ""
    jasmin_public_url: str = ""
    jasmin_account: str = ""
    jasmin_subscription: str = ""
    jasmin_client_id: str = ""
    jasmin_client_secret: str = ""
    jasmin_token_url: str = "https://identity.primaverabss.com/connect/token"
    jasmin_scope: str = "application"
    jasmin_company_key: str = ""
    jasmin_quotation_type: str = "ORC"
    jasmin_quotation_serie: str = ""
    jasmin_default_price_list: str = "03"
    jasmin_default_payment_method: str = "TRA"
    jasmin_default_payment_term: str = "00"
    jasmin_default_delivery_term: str = "TRANSP"
    jasmin_default_currency: str = "EUR"
    jasmin_default_country: str = "PT"
    jasmin_default_customer_group: str = "02"
    jasmin_default_party_tax_schema: str = "CONTINENTE"
    jasmin_default_unit: str = "UN"
    jasmin_default_item_tax_schema: str = "NORMAL"
    jasmin_default_sales_item: str = ""

    packlink_enabled: bool = False
    packlink_base_url: str = ""
    packlink_public_url: str = ""
    packlink_api_key: str = ""
    packlink_default_service_id: str = "20571"
    packlink_default_service: str = "Paq 24"
    packlink_default_carrier: str = "Correos Express"
    packlink_source: str = "PRO"
    packlink_platform: str = "PRO"
    packlink_platform_country: str = "UN"

    # External company/contact lookup API used by the fiscal enrichment worker.
    # Example base URL: http://127.0.0.1:8000 from informa_pipeline_api.
    external_company_lookup_enabled: bool = False
    external_company_lookup_base_url: str = ""
    external_company_lookup_api_key: str = ""
    external_company_lookup_timeout: int = 10
    external_company_lookup_auto_threshold: float = 95.0

    # LLM-assisted identity extraction from email body/signature.
    email_identity_extraction_enabled: bool = True
    email_identity_extraction_use_llm: bool = True
    email_identity_llm_model: str = ""
    email_identity_llm_fallback_model: str = ""
    email_identity_llm_timeout_seconds: int = 20
    email_identity_llm_max_body_chars: int = 3500

    max_tokens: int = 2200
    temperature: float = 0.0

    model_config = SettingsConfigDict(
        env_file=".env",
        env_prefix="",
        extra="ignore",
    )


settings = Settings()


def is_production_like_env() -> bool:
    return str(settings.env or "").strip().lower() in {"prod", "production", "staging"}


def validate_admin_auth_settings() -> None:
    if settings.clientflow_admin_auth_mode == "local" and is_production_like_env():
        raise RuntimeError(
            "CLIENTFLOW_ADMIN_AUTH_MODE=local não é permitido em prod/production/staging."
        )
    if (
        settings.clientflow_admin_auth_mode == "token"
        and not str(settings.clientflow_admin_token or "").strip()
    ):
        raise RuntimeError(
            "CLIENTFLOW_ADMIN_TOKEN é obrigatório quando CLIENTFLOW_ADMIN_AUTH_MODE=token."
        )


validate_admin_auth_settings()

if (
    is_production_like_env()
    and settings.external_company_lookup_enabled
    and str(settings.external_company_lookup_base_url or "").strip()
    and not str(settings.external_company_lookup_api_key or "").strip()
):
    raise RuntimeError(
        "EXTERNAL_COMPANY_LOOKUP_API_KEY é obrigatória quando o lookup externo está ativo em produção."
    )

if settings.database_url.strip().lower().startswith("sqlite"):
    raise RuntimeError(
        "ClientFlow requer PostgreSQL. Defina DATABASE_URL com postgresql+psycopg://..."
    )