import os
from dataclasses import dataclass, field
from pathlib import Path

from dotenv import load_dotenv

load_dotenv()


TRUE_VALUES = {"1", "true", "yes", "on"}


#  Хелперы для чтения env-переменных с приведением типов 

def _env_str(name: str, default: str) -> str:
    value = os.getenv(name)
    return value if value is not None else default


def _env_optional_str(name: str) -> str | None:
    value = os.getenv(name)
    if value is None:
        return None
    value = value.strip()
    return value or None


def _env_path_str(name: str) -> str | None:
    value = _env_optional_str(name)
    if value is None:
        return None
    return str(Path(value).expanduser())


def _env_bool(name: str, default: bool) -> bool:
    fallback = "true" if default else "false"
    return _env_str(name, fallback).strip().lower() in TRUE_VALUES


def _env_int(name: str, default: int) -> int:
    return int(_env_str(name, str(default)).strip())


def _env_float(name: str, default: float) -> float:
    return float(_env_str(name, str(default)).strip())


#  Конфиг браузерного отпечатка (User-Agent, viewport, timezone) 

@dataclass(slots=True)
class FingerprintConfig:
    user_agent: str = (
        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
        "AppleWebKit/537.36 (KHTML, like Gecko) "
        "Chrome/135.0.0.0 Safari/537.36"
    )
    viewport_presets: tuple[dict[str, int], ...] = (
        {"width": 1920, "height": 1080},
        {"width": 1600, "height": 900},
        {"width": 1536, "height": 864},
        {"width": 1440, "height": 900},
        {"width": 1366, "height": 768},
    )
    timezone_candidates: tuple[str, ...] = (
        "America/New_York",
        "America/Chicago",
        "America/Los_Angeles",
    )
    locale: str = "en-US"
    sec_ch_ua: str = '"Google Chrome";v="135", "Chromium";v="135", "Not.A/Brand";v="24"'


#  Конфиг перехвата сетевых запросов (лимиты на кол-во) 

@dataclass(slots=True)
class CaptureConfig:
    capture_same_origin_only: bool = _env_bool("IAAI_CAPTURE_SAME_ORIGIN_ONLY", True)
    max_requests: int = _env_int("IAAI_MAX_CAPTURED_REQUESTS", 40)
    max_json_responses: int = _env_int("IAAI_MAX_CAPTURED_JSON_RESPONSES", 30)


#  Конфиг пауз между действиями (имитация человека) 

@dataclass(slots=True)
class HumanPaceConfig:
    enabled: bool = _env_bool("IAAI_HUMAN_PACE_ENABLED", True)
    after_listing_open_min_s: float = _env_float("IAAI_AFTER_LISTING_OPEN_MIN_S", 0.5)
    after_listing_open_max_s: float = _env_float("IAAI_AFTER_LISTING_OPEN_MAX_S", 1.2)
    after_filter_action_min_s: float = _env_float("IAAI_AFTER_FILTER_ACTION_MIN_S", 0.5)
    after_filter_action_max_s: float = _env_float("IAAI_AFTER_FILTER_ACTION_MAX_S", 1.2)
    before_vehicle_open_min_s: float = _env_float("IAAI_BEFORE_VEHICLE_OPEN_MIN_S", 0.1)
    before_vehicle_open_max_s: float = _env_float("IAAI_BEFORE_VEHICLE_OPEN_MAX_S", 0.3)
    after_vehicle_open_min_s: float = _env_float("IAAI_AFTER_VEHICLE_OPEN_MIN_S", 0.05)
    after_vehicle_open_max_s: float = _env_float("IAAI_AFTER_VEHICLE_OPEN_MAX_S", 0.15)
    between_vehicles_min_s: float = _env_float("IAAI_BETWEEN_VEHICLES_MIN_S", 0.05)
    between_vehicles_max_s: float = _env_float("IAAI_BETWEEN_VEHICLES_MAX_S", 0.15)
    after_page_change_min_s: float = _env_float("IAAI_AFTER_PAGE_CHANGE_MIN_S", 0.8)
    after_page_change_max_s: float = _env_float("IAAI_AFTER_PAGE_CHANGE_MAX_S", 1.8)


#  Конфиг сбора листинга (URL, лимиты страниц и машин) 

@dataclass(slots=True)
class ListingConfig:
    cars_url: str = _env_str("IAAI_CARS_LISTING_URL", "https://www.iaai.com/Vehiclelisting/Cars")
    max_pages_per_run: int = _env_int("IAAI_MAX_PAGES_PER_RUN", 9999)
    max_vehicles_per_run: int = _env_int("IAAI_MAX_VEHICLES_PER_RUN", 50000)
    page_link_limit: int = _env_int("IAAI_PAGE_LINK_LIMIT", 500)
    include_pagination: bool = _env_bool("IAAI_INCLUDE_PAGINATION", True)
    collect_current_page_only: bool = _env_bool("IAAI_COLLECT_CURRENT_PAGE_ONLY", False)
    # Порог раннего останова: если доля уже известных машин на странице >= этого значения,
    # прекращаем листать — все новые машины уже найдены. 0 = отключено.
    early_stop_threshold: float = _env_float("IAAI_EARLY_STOP_THRESHOLD", 0.8)


# - Конфиг PostgreSQL (URL, пул соединений, pool_recycle) 

@dataclass(slots=True)
class DatabaseConfig:
    url: str = _env_str("IAAI_DATABASE_URL", "postgresql+psycopg2://iaai:iaai@localhost:5432/iaai_scraper")
    echo: bool = _env_bool("IAAI_DATABASE_ECHO", False)
    pool_size: int = _env_int("IAAI_DATABASE_POOL_SIZE", 5)
    max_overflow: int = _env_int("IAAI_DATABASE_MAX_OVERFLOW", 10)
    pool_recycle_seconds: int = _env_int("IAAI_DATABASE_POOL_RECYCLE_SECONDS", 1800)
    auto_create_tables: bool = _env_bool("IAAI_DATABASE_AUTO_CREATE_TABLES", False)


# --- Конфиг Redis (URL для Celery broker) ---

@dataclass(slots=True)
class RedisConfig:
    url: str = _env_str("IAAI_REDIS_URL", "redis://localhost:6379/0")


# --- Конфиг Celery (лимиты задач, concurrency, beat-расписание) ---

@dataclass(slots=True)
class CeleryConfig:
    broker_url: str = _env_str("CELERY_BROKER_URL", "")
    result_backend: str = _env_str("CELERY_RESULT_BACKEND", "")
    task_soft_time_limit: int = _env_int("CELERY_TASK_SOFT_TIME_LIMIT", 3300)
    task_time_limit: int = _env_int("CELERY_TASK_TIME_LIMIT", 3600)
    worker_concurrency: int = _env_int("CELERY_WORKER_CONCURRENCY", 4)
    worker_max_tasks_per_child: int = _env_int("CELERY_WORKER_MAX_TASKS_PER_CHILD", 5)
    broker_visibility_timeout: int = _env_int("CELERY_BROKER_VISIBILITY_TIMEOUT", 7200)
    beat_sync_interval_minutes: int = _env_int("CELERY_BEAT_SYNC_INTERVAL_MINUTES", 60)
    beat_sync_limit: int | None = _env_int("CELERY_BEAT_SYNC_LIMIT", 0) or None
    batch_size: int = _env_int("CELERY_BATCH_SIZE", 50)
    parallel_tabs: int = _env_int("IAAI_PARALLEL_TABS", 8)
    block_resources: bool = _env_bool("IAAI_BLOCK_RESOURCES", True)


# --- Конфиг прокси (server, username, password) ---

@dataclass(slots=True)
class ProxyConfig:
    server: str | None = _env_optional_str("IAAI_PROXY_SERVER")
    username: str | None = _env_optional_str("IAAI_PROXY_USERNAME")
    password: str | None = _env_optional_str("IAAI_PROXY_PASSWORD")

    @property
    def enabled(self) -> bool:
        return bool(self.server)

    def to_playwright_dict(self) -> dict[str, str] | None:
        if not self.server:
            return None
        result: dict[str, str] = {"server": self.server}
        if self.username:
            result["username"] = self.username
        if self.password:
            result["password"] = self.password
        return result


#  Главный объект настроек: собирает все блоки конфигурации 

@dataclass(slots=True)
class Settings:
    home_url: str = "https://www.iaai.com/"
    default_timeout_ms: int = _env_int("IAAI_TIMEOUT_MS", 45000)
    network_settle_ms: int = _env_int("IAAI_NETWORK_SETTLE_MS", 400)
    fast_path_timeout_ms: int = _env_int("IAAI_FAST_PATH_TIMEOUT_MS", 5000)
    fast_path_max_attempts: int = _env_int("IAAI_FAST_PATH_MAX_ATTEMPTS", 1)
    fallback_navigation_timeout_ms: int = _env_int("IAAI_FALLBACK_NAV_TIMEOUT_MS", 15000)
    max_retries: int = _env_int("IAAI_MAX_RETRIES", 3)
    retry_delay_seconds: float = _env_float("IAAI_RETRY_DELAY_SECONDS", 2.5)
    retry_backoff_multiplier: float = _env_float("IAAI_RETRY_BACKOFF_MULTIPLIER", 2.0)
    retry_jitter_seconds: float = _env_float("IAAI_RETRY_JITTER_SECONDS", 0.25)
    headless: bool = _env_bool("IAAI_HEADLESS", True)
    browser_engine: str = _env_str("IAAI_BROWSER_ENGINE", "auto")
    log_level: str = _env_str("IAAI_LOG_LEVEL", "INFO")
    log_file: str | None = _env_optional_str("IAAI_LOG_FILE")
    enable_trace_id_logs: bool = _env_bool("IAAI_ENABLE_TRACE_ID_LOGS", True)
    sync_only_new: bool = _env_bool("IAAI_SYNC_ONLY_NEW", False)
    raw_output_json: str | None = _env_optional_str("IAAI_RAW_OUTPUT_JSON")
    tokens_file: str | None = _env_path_str("IAAI_TOKENS_FILE")
    runtime_config_file: str | None = _env_path_str("IAAI_RUNTIME_CONFIG_FILE")
    scheduler_interval_minutes: int = _env_int("IAAI_SCHEDULER_INTERVAL_MINUTES", 60)
    fingerprint: FingerprintConfig = field(default_factory=FingerprintConfig)
    capture: CaptureConfig = field(default_factory=CaptureConfig)
    pace: HumanPaceConfig = field(default_factory=HumanPaceConfig)
    listing: ListingConfig = field(default_factory=ListingConfig)
    database: DatabaseConfig = field(default_factory=DatabaseConfig)
    redis: RedisConfig = field(default_factory=RedisConfig)
    celery: CeleryConfig = field(default_factory=CeleryConfig)
    proxy: ProxyConfig = field(default_factory=ProxyConfig)

    @property
    def parallel_tabs(self) -> int:
        return self.celery.parallel_tabs

    @property
    def block_resources(self) -> bool:
        return self.celery.block_resources

# Глобальный синглтон — используется по умолчанию во всех модулях.
settings = Settings()