from __future__ import annotations

import logging
import shutil
import subprocess
import time
from dataclasses import dataclass
from pathlib import Path

from .browser_profile import FirefoxHardening, ensure_firefox_profile
from .paths import app_data_dir

log = logging.getLogger(__name__)


@dataclass
class BrowserConfig:
    firefox_path: str = ""
    profile_dir: str = ""
    clear_on_close: bool = True
    disposable_profile: bool = False
    kill_on_chain_drop: bool = True
    auto_relaunch: bool = False
    lock_managed_profile: bool = True
    force_proxy: bool = True
    disable_webrtc: bool = True
    resist_fingerprinting: bool = True
    disable_telemetry: bool = True
    first_party_isolation: bool = True
    strict_tracking_protection: bool = True
    timezone_utc: bool = True


def default_firefox_path() -> str:
    candidates = [
        Path(r"C:\Program Files\Mozilla Firefox\firefox.exe"),
        Path(r"C:\Program Files (x86)\Mozilla Firefox\firefox.exe"),
    ]
    for c in candidates:
        if c.is_file():
            return str(c)
    return ""


def default_profile_dir() -> str:
    return str(app_data_dir() / "browser_profiles" / "firefox_hardened")


class BrowserSession:
    def __init__(self) -> None:
        self._proc: subprocess.Popen[str] | None = None
        self._profile_path: Path | None = None

    def is_running(self) -> bool:
        return self._proc is not None and self._proc.poll() is None

    def pid(self) -> int | None:
        if self._proc is None:
            return None
        return self._proc.pid

    def launch(
        self,
        cfg: BrowserConfig,
        proxy_host: str,
        proxy_port: int,
    ) -> tuple[bool, str]:
        raw_exe = (cfg.firefox_path or default_firefox_path()).strip().strip('"').strip("'")
        exe = Path(raw_exe)
        if not exe.is_file():
            return False, f"Firefox executable not found: {raw_exe or '(empty path)'}"
        raw_profile = (cfg.profile_dir or default_profile_dir()).strip().strip('"').strip("'")
        profile_dir = Path(raw_profile)
        hard = FirefoxHardening(
            force_proxy=cfg.force_proxy,
            disable_webrtc=cfg.disable_webrtc,
            resist_fingerprinting=cfg.resist_fingerprinting,
            disable_telemetry=cfg.disable_telemetry,
            first_party_isolation=cfg.first_party_isolation,
            strict_tracking_protection=cfg.strict_tracking_protection,
            clear_on_shutdown=cfg.clear_on_close,
            timezone_utc=cfg.timezone_utc,
        )
        if cfg.lock_managed_profile:
            ensure_firefox_profile(profile_dir, proxy_host, int(proxy_port), hard)
        if self.is_running():
            self.stop()
        if cfg.lock_managed_profile:
            args = [str(exe), "-no-remote", "-profile", str(profile_dir)]
        else:
            args = [str(exe)]
        try:
            self._proc = subprocess.Popen(
                args,
                creationflags=getattr(subprocess, "CREATE_NO_WINDOW", 0),
                stdout=subprocess.DEVNULL,
                stderr=subprocess.DEVNULL,
                text=True,
            )
            # Smoke-check: catch immediate startup crashes and report clearly.
            time.sleep(0.4)
            rc = self._proc.poll()
            if rc is not None:
                self._proc = None
                return False, f"Firefox exited immediately (code {rc}). Check path/profile."
            self._profile_path = profile_dir if cfg.lock_managed_profile else None
            log.info("Launched hardened Firefox pid=%s profile=%s", self._proc.pid, profile_dir)
            if cfg.lock_managed_profile:
                return True, f"Hardened Firefox started (pid {self._proc.pid})."
            return True, f"Firefox started (unlocked mode, pid {self._proc.pid})."
        except Exception as e:
            self._proc = None
            return False, f"Launch failed: {e!s}"

    def stop(self, dispose: bool = False) -> tuple[bool, str]:
        if self._proc and self._proc.poll() is None:
            try:
                self._proc.terminate()
                self._proc.wait(timeout=8)
            except Exception:
                try:
                    self._proc.kill()
                except Exception:
                    pass
            finally:
                self._proc = None
        if dispose and self._profile_path and self._profile_path.exists():
            try:
                shutil.rmtree(self._profile_path, ignore_errors=True)
            except Exception:
                pass
        return True, "Browser stopped."