"""Typed settings for GCP Solution Architecture Agent."""

import os
from pathlib import Path
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    """Application Settings."""

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

    # Agent Identity
    AGENT_NAME: str = "gcp_solution_architecture_agent"
    AGENT_VERSION: str = "1.0.0"
    LOG_LEVEL: str = "INFO"

    # Server Configuration
    HOST: str = "0.0.0.0"
    PORT: int = 8080

    # LLM Settings
    OPENAI_API_KEY: str | None = None
    AZURE_OPENAI_API_KEY: str | None = None
    AZURE_OPENAI_ENDPOINT: str | None = None
    AZURE_OPENAI_DEPLOYMENT: str = "gpt-4o"
    AZURE_OPENAI_API_VERSION: str = "2024-02-15-preview"
    LLM_TEMPERATURE: float = 0.2

    # Google Cloud Environment & Scanner Credentials
    GOOGLE_APPLICATION_CREDENTIALS: str | None = None
    GCP_PROJECT_ID: str | None = None
    GCP_REGION: str = "us-central1"

    # Database & Storage Settings (External PostgreSQL)
    POSTGRES_HOST: str = "localhost"
    POSTGRES_PORT: int = 5432
    POSTGRES_DB: str = "gcp_agent_db"
    POSTGRES_USER: str = "postgres"
    POSTGRES_PASSWORD: str = "postgres"
    DATABASE_URL: str | None = None
    SQLITE_FALLBACK_DB: str = "gcp_agent_local.db"

    # ADK Multi-Agent Orchestrator Settings
    ADK_MAX_LOOP_ITERATIONS: int = 5
    ADK_ENABLE_ARTIFACT_STORE: bool = True

    # Google Developer Knowledge MCP Server Settings
    DEVELOPER_KNOWLEDGE_MCP_URL: str = "https://developerknowledge.googleapis.com/mcp"
    DEVELOPER_KNOWLEDGE_MCP_ENABLED: bool = True

    # Paths
    BASE_DIR: Path = Path(__file__).resolve().parent.parent
    SKILLS_DIR: Path = Path(__file__).resolve().parent / "skills"
    EVAL_DATASET_PATH: Path = Path(__file__).resolve().parent.parent / "eval" / "datasets" / "benchmark_cases.json"

    def get_database_url(self) -> str:
        """Construct database connection URL (PostgreSQL or SQLite fallback)."""
        if self.DATABASE_URL:
            return self.DATABASE_URL
        return f"postgresql://{self.POSTGRES_USER}:{self.POSTGRES_PASSWORD}@{self.POSTGRES_HOST}:{self.POSTGRES_PORT}/{self.POSTGRES_DB}"


_settings: Settings | None = None


def get_settings() -> Settings:
    """Get singleton Settings instance."""
    global _settings
    if _settings is None:
        _settings = Settings()
    return _settings