from __future__ import annotations

from dataclasses import dataclass
from pathlib import Path
import os

from dotenv import load_dotenv


ROOT_DIR = Path(__file__).resolve().parent.parent
load_dotenv(ROOT_DIR / ".env")


def _int_env(name: str, default: int) -> int:
    value = os.getenv(name)
    if not value:
        return default
    return int(value)


def _bool_env(name: str, default: bool) -> bool:
    value = os.getenv(name)
    if value is None:
        return default
    return value.strip().lower() in {"1", "true", "yes", "on"}


@dataclass(frozen=True)
class Settings:
    app_id: str
    product_name: str
    database_path: Path
    sync_interval_minutes: int
    auto_sync_enabled: bool
    twitter_enabled: bool
    twitter_username: str
    twitter_scraper_path: Path
    twitter_output_dir: Path
    twitter_browser_provider: str
    twitter_full_max_no_new: int
    twitter_incremental_max_no_new: int
    twitter_thread_max_no_new: int
    twitter_command_timeout_seconds: int
    twitter_full_reply_post_limit: int
    twitter_incremental_reply_parent_limit: int
    discussion_full_scan_max_pages: int
    discussion_incremental_max_pages: int
    full_scan_time_limit_seconds: int
    openrouter_api_key: str | None
    openrouter_model: str
    openrouter_referer: str
    openrouter_title: str


def get_settings() -> Settings:
    database_path = Path(os.getenv("DATABASE_PATH", "data/tohotopia_monitor.sqlite3"))
    if not database_path.is_absolute():
        database_path = ROOT_DIR / database_path
    twitter_scraper_path = Path(
        os.getenv(
            "TWITTER_SCRAPER_PATH",
            str(Path.home() / ".codex" / "skills" / "social-media-scraper" / "scraper.py"),
        )
    )
    if not twitter_scraper_path.is_absolute():
        twitter_scraper_path = ROOT_DIR / twitter_scraper_path
    twitter_output_dir = Path(os.getenv("TWITTER_OUTPUT_DIR", "任务/社媒数据/twitter-monitor"))
    if not twitter_output_dir.is_absolute():
        twitter_output_dir = ROOT_DIR / twitter_output_dir
    return Settings(
        app_id=os.getenv("APP_ID", "3774440"),
        product_name=os.getenv("PRODUCT_NAME", "帝国幻想乡~TOHOTOPIA"),
        database_path=database_path,
        sync_interval_minutes=_int_env("SYNC_INTERVAL_MINUTES", 30),
        auto_sync_enabled=_bool_env("AUTO_SYNC_ENABLED", True),
        twitter_enabled=_bool_env("TWITTER_ENABLED", False),
        twitter_username=os.getenv("TWITTER_USERNAME", "Tohotopia"),
        twitter_scraper_path=twitter_scraper_path,
        twitter_output_dir=twitter_output_dir,
        twitter_browser_provider=os.getenv("TWITTER_BROWSER_PROVIDER", "existing"),
        twitter_full_max_no_new=_int_env("TWITTER_FULL_MAX_NO_NEW", 6),
        twitter_incremental_max_no_new=_int_env("TWITTER_INCREMENTAL_MAX_NO_NEW", 2),
        twitter_thread_max_no_new=_int_env("TWITTER_THREAD_MAX_NO_NEW", 3),
        twitter_command_timeout_seconds=_int_env("TWITTER_COMMAND_TIMEOUT_SECONDS", 900),
        twitter_full_reply_post_limit=_int_env("TWITTER_FULL_REPLY_POST_LIMIT", 0),
        twitter_incremental_reply_parent_limit=_int_env("TWITTER_INCREMENTAL_REPLY_PARENT_LIMIT", 20),
        discussion_full_scan_max_pages=_int_env("DISCUSSION_FULL_SCAN_MAX_PAGES", 500),
        discussion_incremental_max_pages=_int_env("DISCUSSION_INCREMENTAL_MAX_PAGES", 5),
        full_scan_time_limit_seconds=_int_env("FULL_SCAN_TIME_LIMIT_SECONDS", 7200),
        openrouter_api_key=os.getenv("OPENROUTER_API_KEY"),
        openrouter_model=os.getenv("OPENROUTER_MODEL", "deepseek/deepseek-v4-pro"),
        openrouter_referer=os.getenv("OPENROUTER_REFERER", "http://localhost:8000"),
        openrouter_title=os.getenv("OPENROUTER_TITLE", "TOHOTOPIA Steam Monitor"),
    )