"""Configuration management for LLM Code Deployment system."""
import os
from pathlib import Path
from typing import Literal

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    """Application settings loaded from environment variables."""

    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8", extra="ignore")

    # Student Configuration
    student_secret: str = Field(default="", description="Secret key for authentication")
    student_email: str = Field(default="", description="Student email address")
    student_api_port: int = Field(default=8000, description="Student API port")

    # GitHub Configuration
    github_token: str = Field(default="", description="GitHub personal access token")
    github_username: str = Field(default="", description="GitHub username")

    # LLM Configuration
    anthropic_api_key: str = Field(default="", description="Anthropic API key")
    openai_api_key: str = Field(default="", description="OpenAI API key")
    llm_provider: Literal["anthropic", "openai", "aipipe"] = Field(
        default="aipipe", description="LLM provider to use"
    )
    llm_model: str = Field(
        default="google/gemini-2.0-flash-lite-001", description="LLM model to use"
    )

    # AIPipe Configuration
    aipipe_token: str = Field(default="", description="AIPipe API token")
    aipipe_base_url: str = Field(
        default="https://aipipe.org/openrouter/v1",
        description="AIPipe base URL"
    )

    # Instructor Configuration
    instructor_api_port: int = Field(default=8001, description="Instructor API port")
    database_url: str = Field(
        default="postgresql://localhost:5432/llm_deployment", description="Database URL"
    )
    evaluation_api_url: str = Field(
        default="http://localhost:8001/api/evaluate", description="Evaluation API URL"
    )

    # Task Configuration
    task_timeout_minutes: int = Field(default=10, description="Task timeout in minutes")
    max_retry_attempts: int = Field(default=3, description="Maximum retry attempts")
    retry_delays: str = Field(default="1,2,4,8", description="Retry delays in seconds")

    # Paths
    generated_repos_dir: Path = Field(
        default=Path("./generated_repos"), description="Directory for generated repos"
    )
    task_templates_dir: Path = Field(
        default=Path("./templates"), description="Directory for task templates"
    )
    submissions_csv: Path = Field(
        default=Path("./submissions.csv"), description="Path to submissions CSV"
    )

    # Logging
    log_level: str = Field(default="INFO", description="Logging level")
    log_file: Path = Field(default=Path("./logs/app.log"), description="Log file path")

    def get_retry_delays(self) -> list[int]:
        """Parse retry delays from comma-separated string."""
        return [int(d.strip()) for d in self.retry_delays.split(",")]

    def ensure_directories(self) -> None:
        """Ensure all required directories exist."""
        self.generated_repos_dir.mkdir(parents=True, exist_ok=True)
        self.task_templates_dir.mkdir(parents=True, exist_ok=True)
        self.log_file.parent.mkdir(parents=True, exist_ok=True)


# Global settings instance
settings = Settings()