#!/usr/bin/python3
"""Backup list of books from Goodreads."""

import argparse
import configparser
import os
import sys
import time
from datetime import date
from urllib.parse import urljoin

from playwright.sync_api import Page, Playwright, TimeoutError, sync_playwright


refresh_backup = True

today = date.today().isoformat()  # current date in ISO format

config = configparser.ConfigParser()

config_file_path = os.path.expanduser(
    os.path.join(os.getenv("XDG_CONFIG_HOME", "~/.config"), "goodreads", "config")
)
assert os.path.exists(config_file_path)
config.read(os.path.expanduser(config_file_path))
script_dir = os.path.dirname(os.path.abspath(__file__))


def login(page: Page) -> None:
    """Login to Goodreads."""
    page.get_by_role("link", name="Sign In").click()
    page.get_by_role("button", name="Sign in with email").click()
    page.get_by_label("Email").fill(config.get("login", "email"))
    page.get_by_label("Password").fill(config.get("login", "password"))
    page.get_by_role("checkbox", name="Keep me signed in").check()
    try:
        page.get_by_label("Sign in").click()
    except TimeoutError:
        # The submit can succeed but never reach Playwright's expected navigation state.
        pass


def run_backup(page: Page) -> None:
    """Run backup."""
    import_url = "https://www.goodreads.com/review/import"
    page.goto(import_url)

    if refresh_backup:
        print("backup requested")
        export_button = page.get_by_role("button", name="Export Library")
        if export_button.count() > 0 and export_button.first.is_visible():
            export_button.first.click()
            print("waiting for export to be ready...")

            # JS clears #exportFile when generation starts, then populates it when ready.
            export_file_link = page.locator("#exportFile a")
            try:
                export_file_link.wait_for(state="hidden", timeout=30 * 1000)
            except TimeoutError:
                pass
            export_file_link.wait_for(state="visible", timeout=15 * 60 * 1000)
            print("export ready")
        else:
            print("Export Library button not found, using latest ready export link")

    print("download export")
    export_link = page.get_by_role("link", name="Your export from").first
    export_link.wait_for(state="visible", timeout=2 * 60 * 1000)
    print(export_link.text_content())
    href = export_link.get_attribute("href")
    download_url = urljoin(page.url, href) if href else None
    backup_dir = config.get("backup", "dir")

    save_to = os.path.join(backup_dir, f"{today}_goodreads_library_export.csv")
    try:
        with page.expect_download(timeout=30 * 1000) as download_info:
            export_link.click()
        download = download_info.value
        download.save_as(save_to)
    except TimeoutError:
        if not download_url:
            raise RuntimeError("Could not find export download URL")
        response = None
        for _ in range(60):
            response = page.context.request.get(download_url)
            if response.ok:
                with open(save_to, "wb") as fh:
                    fh.write(response.body())
                break
            time.sleep(2)
        else:
            assert response is not None
            raise RuntimeError(f"Export download failed with status {response.status}")


def has_auth(path: str) -> bool:
    """Check if auth.json exists and is non-empty."""
    return os.path.exists(path) and os.path.getsize(path) > 0


def run(
    playwright: Playwright,
    headless: bool = True,
    har_path: str | None = None,
    mode: str = "backup",
) -> int:
    """Download export."""
    browser = playwright.chromium.launch(headless=headless)
    auth_json = os.path.join(script_dir, "auth.json")
    if has_auth(auth_json) and har_path:
        context = browser.new_context(
            storage_state=auth_json,
            record_har_path=har_path,
            record_har_mode="minimal",
        )
    elif has_auth(auth_json):
        context = browser.new_context(storage_state=auth_json)
    elif har_path:
        context = browser.new_context(
            record_har_path=har_path,
            record_har_mode="minimal",
        )
    else:
        context = browser.new_context()
    page = context.new_page()

    page.goto("https://www.goodreads.com/")
    logged_in = not page.get_by_role("link", name="Sign In").is_visible()

    if mode == "check_login":
        print("logged in" if logged_in else "not logged in")
        page.close()
        context.close()
        browser.close()
        return 0 if logged_in else 1

    if not logged_in:
        print("not logged in, logging in...")
        login(page)

    if mode == "login_only":
        print("login complete")
    else:
        run_backup(page)

    page.close()

    context.storage_state(path=auth_json)
    context.close()
    browser.close()
    return 0


parser = argparse.ArgumentParser(description="Backup list of books from Goodreads.")
parser.add_argument(
    "--no-headless", action="store_true", help="run browser with a visible window"
)
parser.add_argument(
    "--har-path",
    help="record a HAR file for this run (includes login/export requests)",
)
mode_group = parser.add_mutually_exclusive_group()
mode_group.add_argument(
    "--check-login",
    action="store_true",
    help="check whether current session is logged in and exit",
)
mode_group.add_argument(
    "--login-only",
    action="store_true",
    help="perform login and save auth state without exporting CSV",
)
args = parser.parse_args()

mode = "backup"
if args.check_login:
    mode = "check_login"
elif args.login_only:
    mode = "login_only"

with sync_playwright() as playwright:
    sys.exit(
        run(
            playwright,
            headless=not args.no_headless,
            har_path=args.har_path,
            mode=mode,
        )
    )