from typing import Any, Self

from fansifter_common.constants import PROD_ENVIRONMENT, QA_ENVIRONMENT
from fansifter_common.utils.functional import lazy_proxy
from pydantic import (
    Field,
    ValidationError,
    model_validator,
)
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    environment: str
    debug: bool = Field(validation_alias="APP_DEBUG", default=False)

    service_name: str = "lambda-audience-sendgrid-webhooks"
    service_version: str = "0.1.0"

    aws_region_name: str = "us-east-1"

    kafka_bootstrap_servers: str = "localhost"
    kafka_sendgrid_events_topic: str = "event.sendgrid.webhook.general"
    kafka_use_ssl: bool = False

    @property
    def kafka_servers(self) -> list[str]:
        return self.kafka_bootstrap_servers.split(",")

    @model_validator(mode="after")
    def _kafka_use_ssl(self) -> Self:
        if self.environment in [QA_ENVIRONMENT, PROD_ENVIRONMENT]:
            self.kafka_use_ssl = True
        return self

    sendgrid_public_keys: dict[str, str] = {"/events": "sendgrid_public_key"}

    failed_events_s3_bucket: str = "qa-sendgrid-webhooks-dead-letter-events"

    # Logging
    logging_debug: bool = Field(validation_alias="LOGGING_DEBUG", default=False)

    @property
    def logging_config(self) -> dict[str, Any]:
        return {
            "version": 1,
            "disable_existing_loggers": True,
            "formatters": {
                "json": {
                    "()": "owslogger.logger.DDJsonFormatter",
                    "service_name": self.service_name,
                    "service_version": self.service_version,
                    "env": self.environment,
                },
                "console": {
                    "()": "fansifter_common.logging.ConsoleFormatter",
                },
            },
            "filters": {
                "require_debug_true": {
                    "()": "fansifter_common.logging.RequireDebugTrueFilter",
                    "value": self.logging_debug,
                },
                "require_debug_false": {
                    "()": "fansifter_common.logging.RequireDebugFalseFilter",
                    "value": self.logging_debug,
                },
            },
            "handlers": {
                "stream": {
                    "level": "INFO",
                    "class": "logging.StreamHandler",
                    "formatter": "json",
                    "filters": ["require_debug_false"],
                },
                "rich": {
                    "level": "INFO",
                    "class": "rich.logging.RichHandler",
                    "filters": ["require_debug_true"],
                    "formatter": "console",
                },
            },
            "loggers": {
                "app": {
                    "handlers": ["stream", "rich"],
                    "level": "INFO",
                    "propagate": False,
                },
                "httpx": {
                    "handlers": ["stream", "rich"],
                    "level": "WARNING",
                    "propagate": False,
                },
            },
        }

    # Sentry
    sentry_dsn: str | None = None

    @model_validator(mode="after")
    def _setup_sentry_dsn(self) -> Self:
        if not self.sentry_dsn and self.environment in [
            QA_ENVIRONMENT,
            PROD_ENVIRONMENT,
        ]:
            raise ValueError(f"Sentry is not configured in {self.environment}.")
        return self

    model_config = SettingsConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        case_sensitive=False,
        extra="allow",
    )


def initialize_settings(**defaults: Any) -> Settings:
    try:
        return Settings(**defaults)
    except ValidationError as exc:
        errors = "\n".join(
            [
                f" * {'.'.join(map(str, error['loc']))} - {error['msg']}"
                for error in exc.errors()
            ]
        )
        raise RuntimeError(f"Failed to initialize settings:\n {errors}") from exc


# Lazy proxy for settings
settings = lazy_proxy(initialize_settings)