from __future__ import annotations

from functools import lru_cache
from os import environ
from pathlib import Path

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict

SERVER_DIR = Path(__file__).resolve().parents[3]
ROOT_DIR = SERVER_DIR.parent


class Settings(BaseSettings):
    model_config = SettingsConfigDict(
        env_file=(ROOT_DIR / ".env", SERVER_DIR / ".env"),
        env_file_encoding="utf-8",
        extra="ignore",
    )

    app_name: str = Field(default="X-Financial Server", alias="APP_NAME")
    app_env: str = Field(default="local", alias="APP_ENV")
    app_debug: bool = Field(default=True, alias="APP_DEBUG")
    setup_completed: bool = Field(default=False, alias="SETUP_COMPLETED")

    company_name: str = Field(default="", alias="COMPANY_NAME")
    company_code: str = Field(default="", alias="COMPANY_CODE")
    admin_email: str = Field(default="", alias="ADMIN_EMAIL")

    web_host: str = Field(default="0.0.0.0", alias="WEB_HOST")
    web_port: int = Field(default=5173, alias="WEB_PORT")
    app_host: str = Field(default="0.0.0.0", alias="SERVER_HOST")
    app_port: int = Field(default=8000, alias="SERVER_PORT")
    api_v1_prefix: str = Field(default="/api/v1", alias="API_V1_PREFIX")

    postgres_host: str = Field(default="127.0.0.1", alias="POSTGRES_HOST")
    postgres_port: int = Field(default=5432, alias="POSTGRES_PORT")
    postgres_db: str = Field(default="x_financial", alias="POSTGRES_DB")
    postgres_user: str = Field(default="postgres", alias="POSTGRES_USER")
    postgres_password: str = Field(default="postgres", alias="POSTGRES_PASSWORD")

    database_url: str | None = Field(default=None, alias="DATABASE_URL")
    sqlalchemy_echo: bool = Field(default=False, alias="SQLALCHEMY_ECHO")

    redis_url: str | None = Field(default=None, alias="REDIS_URL")
    cors_origins: list[str] = Field(default_factory=list, alias="CORS_ORIGINS")
    vite_api_base_url: str = Field(
        default="http://127.0.0.1:8000/api/v1", alias="VITE_API_BASE_URL"
    )

    log_level: str = Field(default="INFO", alias="LOG_LEVEL")
    log_dir: str = Field(default="logs", alias="LOG_DIR")
    log_file_enabled: bool = Field(default=True, alias="LOG_FILE_ENABLED")
    storage_root_dir: str = Field(default="storage", alias="STORAGE_ROOT_DIR")

    @property
    def resolved_database_url(self) -> str:
        if self.database_url:
            return self.database_url

        return (
            f"postgresql+psycopg://{self.postgres_user}:{self.postgres_password}"
            f"@{self.postgres_host}:{self.postgres_port}/{self.postgres_db}"
        )

    @property
    def resolved_storage_root_dir(self) -> Path:
        path = Path(self.storage_root_dir)
        if not path.is_absolute():
            path = SERVER_DIR / path
        return path.resolve()


@lru_cache
def get_settings() -> Settings:
    return Settings()


def refresh_settings(updated_values: dict[str, str]) -> Settings:
    for key, value in updated_values.items():
        environ[key] = value

    get_settings.cache_clear()
    return get_settings()