"""
config.py — Centralised configuration for RepoRadar.

Loads environment variables and defines git-server endpoints, the colour
palette, cache TTLs and other tunables. Import `settings` everywhere instead of
reading os.environ directly so configuration stays in one place.
"""

from __future__ import annotations

import os
from dataclasses import dataclass
from pathlib import Path

from dotenv import load_dotenv

# Load .env from the project root (the directory this file lives in).
PROJECT_ROOT = Path(__file__).resolve().parent
load_dotenv(PROJECT_ROOT / ".env")


def _get_int(name: str) -> int | None:
    """Parse an optional integer env var, returning None when unset/blank."""
    raw = os.getenv(name, "").strip()
    if not raw:
        return None
    try:
        return int(raw)
    except ValueError:
        return None


@dataclass(frozen=True)
class Settings:
    """Immutable runtime settings sourced from environment + defaults."""

    # ── Discord ──────────────────────────────────────────────
    discord_token: str = os.getenv("DISCORD_TOKEN", "").strip()
    # Restrict slash-command sync to one guild for instant updates (recommended).
    guild_id: int | None = _get_int("GUILD_ID")

    # ── Git server ───────────────────────────────────────────
    # Provider: "auto" (probe), "gitea" (also Forgejo), "gitlab", or "github".
    git_provider: str = os.getenv("GIT_PROVIDER", "auto").strip().lower()
    # Base URL of the git server, e.g. https://git.example.com  /  https://gitlab.com
    # For GitHub leave blank (defaults to api.github.com) and set GIT_PROVIDER=github.
    git_base_url: str = os.getenv("GIT_BASE_URL", "").strip().rstrip("/")
    # Personal access token (read-only is enough). Optional for public servers.
    git_token: str = os.getenv("GIT_TOKEN", "").strip()
    # Default channel for new-project drops (also settable per-guild via modal).
    git_drop_channel_id: int | None = _get_int("GIT_DROP_CHANNEL_ID")
    # Channel for highlighted/featured drops (keyword/star matches).
    git_highlight_channel_id: int | None = _get_int("GIT_HIGHLIGHT_CHANNEL_ID")
    # Role to ping on a highlighted drop.
    git_highlight_role_id: int | None = _get_int("GIT_HIGHLIGHT_ROLE_ID")
    # How often (seconds) the monitor polls the git server for new projects.
    git_poll_interval: int = _get_int("GIT_POLL_INTERVAL") or 300
    # Max new projects to drop per scan cycle (avoids flooding on bursts).
    git_max_drops_per_cycle: int = _get_int("GIT_MAX_DROPS_PER_CYCLE") or 10

    # ── Paths ────────────────────────────────────────────────
    data_dir: Path = PROJECT_ROOT / "data"
    db_path: Path = PROJECT_ROOT / "data" / "reporadar.db"

    # ── Behaviour ────────────────────────────────────────────
    log_level: str = os.getenv("LOG_LEVEL", "INFO").strip().upper()
    http_timeout: int = 30                    # seconds per request
    request_retries: int = 3                  # transient retry attempts
    user_agent: str = "RepoRadar/1.0 (+https://github.com/your-org/reporadar)"

    # ── Cyberpunk / hacker colour palette (hex → int) ─────────
    color_drop: int = 0x8A63FF                # neon violet (new project drops)
    color_highlight: int = 0xE0115F           # ruby (featured / highlighted)
    color_success: int = 0x00FF9C             # matrix green
    color_error: int = 0xFF003C               # neon red
    color_medium: int = 0xFFB300              # amber (unconfigured / neutral)
    color_info: int = 0x0A84FF                # electric blue

    def ensure_dirs(self) -> None:
        """Create the data directory if it does not yet exist."""
        self.data_dir.mkdir(parents=True, exist_ok=True)


settings = Settings()