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#!/usr/bin/env python
#
# Copyright (C) 2025 Alexandre Poumaroux, Hiroshi Miura
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of
# this software and associated documentation files (the "Software"), to deal in
# the Software without restriction, including without limitation the rights to
# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
# the Software, and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
import json
import os
from dataclasses import dataclass
from logging import Logger, getLogger
from pathlib import Path
from typing import List, Optional

from defusedxml import ElementTree

from aqt.exceptions import DiskAccessNotPermitted
from aqt.helper import (
    Settings,
    download_installer,
    extract_auth,
    get_os_name,
    get_qt_account_path,
    get_qt_installer_name,
    prepare_installer,
    safely_run,
    safely_run_save_output,
)
from aqt.metadata import Version


@dataclass
class QtPackageInfo:
    name: str
    displayname: str
    version: str


class QtPackageManager:
    def __init__(
        self, arch: str, version: Version, target: str, username: Optional[str] = None, password: Optional[str] = None
    ):
        self.arch = arch
        self.version = version
        self.target = target
        self.cache_dir = self._get_cache_dir()
        self.packages: List[QtPackageInfo] = []
        self.username = username
        self.password = password
        self.logger = getLogger("aqt.commercial")

    def _get_cache_dir(self) -> Path:
        """Create and return cache directory path."""
        base_cache = Settings.qt_installer_cache_path
        cache_path = os.path.join(base_cache, self.target, self.arch, str(self.version))
        Path(cache_path).mkdir(parents=True, exist_ok=True)
        return Path(cache_path)

    def _get_cache_file(self) -> Path:
        """Get the cache file path."""
        return self.cache_dir / "packages.json"

    def _save_to_cache(self) -> None:
        """Save packages information to cache."""
        cache_data = [{"name": pkg.name, "displayname": pkg.displayname, "version": pkg.version} for pkg in self.packages]

        with open(self._get_cache_file(), "w") as f:
            json.dump(cache_data, f, indent=2)

    def _load_from_cache(self) -> bool:
        """Load packages information from cache if available."""
        cache_file = self._get_cache_file()
        if not cache_file.exists():
            return False

        try:
            with open(cache_file, "r") as f:
                cache_data = json.load(f)
                self.packages = [
                    QtPackageInfo(name=pkg["name"], displayname=pkg["displayname"], version=pkg["version"])
                    for pkg in cache_data
                ]
            return True
        except (json.JSONDecodeError, KeyError):
            return False

    def _parse_packages_xml(self, xml_content: str) -> None:
        """Parse packages XML content and extract package information using defusedxml."""
        try:
            # Use defusedxml.ElementTree to safely parse the XML content
            root = ElementTree.fromstring(xml_content)
            self.packages = []

            # Find all package elements using XPath-like expression
            # Note: defusedxml supports a subset of XPath
            for pkg in root.findall(".//package"):
                name = pkg.get("name", "")
                displayname = pkg.get("displayname", "")
                version = pkg.get("version", "")

                if all([name, displayname, version]):  # Ensure all required attributes are present
                    self.packages.append(QtPackageInfo(name=name, displayname=displayname, version=version))
        except ElementTree.ParseError as e:
            raise RuntimeError(f"Failed to parse package XML: {e}")

    def _get_version_string(self) -> str:
        """Get formatted version string for package names."""
        return f"{self.version.major}{self.version.minor}{self.version.patch}"

    def _get_base_package_name(self) -> str:
        """Get the base package name for the current configuration."""
        version_str = self._get_version_string()
        return f"qt.qt{self.version.major}.{version_str}"

    def gather_packages(self, installer_path: str) -> None:
        """Gather package information using qt installer search command."""
        if self._load_from_cache():
            return

        version_str = self._get_version_string()
        base_package = f"qt.qt{self.version.major}.{version_str}"

        cmd = [installer_path, "--accept-licenses", "--accept-obligations", "--confirm-command", "--default-answer"]

        if self.username and self.password:
            cmd.extend(["--email", self.username, "--pw", self.password])

        cmd.append("search")
        cmd.append(base_package)

        try:
            self.logger.info(f"Running: {cmd}")
            output = safely_run_save_output(cmd, Settings.qt_installer_timeout)

            # Handle both string and CompletedProcess outputs
            output_text = output.stdout if hasattr(output, "stdout") else str(output)

            # Extract the XML portion from the output
            xml_start = output_text.find("<availablepackages>")
            xml_end = output_text.find("</availablepackages>") + len("</availablepackages>")

            if xml_start != -1 and xml_end != -1:
                xml_content = output_text[xml_start:xml_end]
                self._parse_packages_xml(xml_content)
                self._save_to_cache()
            else:
                # Log the actual output for debugging
                self.logger.debug(f"Installer output: {output_text}")
                raise RuntimeError("Failed to find package information in installer output")

        except Exception as e:
            raise RuntimeError(f"Failed to get package information: {str(e)}")

    def get_install_command(self, modules: Optional[List[str]], temp_dir: str) -> List[str]:
        """Generate installation command based on requested modules."""
        package_name = f"{self._get_base_package_name()}.{self.arch}"
        cmd = ["install", package_name]

        # No modules requested, return base package only
        if not modules:
            return cmd

        # Ensure package cache exists
        self.gather_packages(temp_dir)

        if "all" in modules:
            # Find all addon and direct module packages
            for pkg in self.packages:
                if f"{self._get_base_package_name()}.addons." in pkg.name or pkg.name.startswith(
                    f"{self._get_base_package_name()}."
                ):
                    module_name = pkg.name.split(".")[-1]
                    if module_name != self.arch:  # Skip the base package
                        cmd.append(pkg.name)
        else:
            # Add specifically requested modules that exist in either format
            for module in modules:
                addon_name = f"{self._get_base_package_name()}.addons.{module}"
                direct_name = f"{self._get_base_package_name()}.{module}"

                # Check if either package name exists
                matching_pkg = next(
                    (pkg.name for pkg in self.packages if pkg.name == addon_name or pkg.name == direct_name), None
                )

                if matching_pkg:
                    cmd.append(matching_pkg)

        return cmd


class CommercialInstaller:
    """Qt Commercial installer that handles module installation and package management."""

    def __init__(
        self,
        target: str,
        arch: Optional[str],
        version: Optional[str],
        username: Optional[str] = None,
        password: Optional[str] = None,
        output_dir: Optional[str] = None,
        logger: Optional[Logger] = None,
        base_url: str = "https://download.qt.io",
        override: Optional[List[str]] = None,
        modules: Optional[List[str]] = None,
        no_unattended: bool = False,
        dry_run: bool = False,
    ):
        self.override = override
        self.target = target
        self.arch = arch or ""
        self.version = Version(version) if version else Version("0.0.0")
        self.output_dir = output_dir
        self.logger = logger or getLogger(__name__)
        self.base_url = base_url
        self.modules = modules
        self.no_unattended = no_unattended
        self.dry_run = dry_run

        # Extract credentials from override if present
        if override:
            extracted_username, extracted_password, self.override = extract_auth(override)
            self.username = extracted_username or username
            self.password = extracted_password or password
        else:
            self.username = username
            self.password = password

        # Set OS-specific properties
        self.os_name = get_os_name()
        self._installer_filename = get_qt_installer_name()
        self.qt_account = get_qt_account_path()
        self.package_manager = QtPackageManager(self.arch, self.version, self.target, self.username, self.password)

    @staticmethod
    def get_auto_answers() -> str:
        """Get auto-answer options from settings."""
        settings_map = {
            "OperationDoesNotExistError": Settings.qt_installer_operationdoesnotexisterror,
            "OverwriteTargetDirectory": Settings.qt_installer_overwritetargetdirectory,
            "stopProcessesForUpdates": Settings.qt_installer_stopprocessesforupdates,
            "installationErrorWithCancel": Settings.qt_installer_installationerrorwithcancel,
            "installationErrorWithIgnore": Settings.qt_installer_installationerrorwithignore,
            "AssociateCommonFiletypes": Settings.qt_installer_associatecommonfiletypes,
            "telemetry-question": Settings.qt_installer_telemetry,
        }

        answers = []
        for key, value in settings_map.items():
            answers.append(f"{key}={value}")

        return ",".join(answers)

    @staticmethod
    def build_command(
        installer_path: str,
        override: Optional[List[str]] = None,
        username: Optional[str] = None,
        password: Optional[str] = None,
        output_dir: Optional[str] = None,
        no_unattended: bool = False,
    ) -> List[str]:
        """Build the installation command with proper safeguards."""
        cmd = [installer_path]

        # Add unattended flags unless explicitly disabled
        if not no_unattended:
            cmd.extend(["--accept-licenses", "--accept-obligations", "--confirm-command"])

        # Add authentication if provided
        if username and password:
            cmd.extend(["--email", username, "--pw", password])

        if override:
            # When using override, still include unattended flags unless disabled
            cmd.extend(override)
            return cmd

        # Add output directory if specified
        if output_dir:
            cmd.extend(["--root", str(Path(output_dir).resolve())])

        # Add auto-answer options from settings
        auto_answers = CommercialInstaller.get_auto_answers()
        if auto_answers:
            cmd.extend(["--auto-answer", auto_answers])

        return cmd

    def install(self) -> None:
        """Run the Qt installation process."""
        if (
            not self.qt_account.exists()
            and (not self.username or not self.password)
            and not os.environ.get("QT_INSTALLER_JWT_TOKEN")
        ):
            raise RuntimeError(
                "No Qt account credentials found. Provide username and password or ensure qtaccount.ini exists."
            )

        # Setup cache directory
        cache_path = Path(Settings.qt_installer_cache_path)
        cache_path.mkdir(parents=True, exist_ok=True)

        # Setup output directory and validate access
        output_dir = Path(self.output_dir) if self.output_dir else Path(os.getcwd()) / "Qt"
        version_dir = output_dir / str(self.version)
        qt_base_dir = output_dir

        if qt_base_dir.exists():
            if Settings.qt_installer_overwritetargetdirectory.lower() == "yes":
                self.logger.warning(f"Target directory {qt_base_dir} exists - removing as overwrite is enabled")
                try:
                    import shutil

                    if version_dir.exists():
                        shutil.rmtree(version_dir)
                except (OSError, PermissionError) as e:
                    raise DiskAccessNotPermitted(f"Failed to remove existing version directory {version_dir}: {str(e)}")

        # Setup temp directory
        temp_dir = Settings.qt_installer_temp_path
        temp_path = Path(temp_dir)
        if not temp_path.exists():
            temp_path.mkdir(parents=True, exist_ok=True)
        else:
            Settings.qt_installer_cleanup()
        installer_path = temp_path / self._installer_filename

        self.logger.info(f"Downloading Qt installer to {installer_path}")
        timeout = (Settings.connection_timeout, Settings.response_timeout)
        download_installer(self.base_url, self._installer_filename, installer_path, timeout)
        installer_path = prepare_installer(installer_path, self.os_name)

        try:
            if self.override:
                if not self.username or not self.password:
                    self.username, self.password, self.override = extract_auth(self.override)

                cmd: list[str] = self.build_command(
                    str(installer_path),
                    override=self.override,
                    no_unattended=self.no_unattended,
                    username=self.username,
                    password=self.password,
                )
            else:
                # Initialize package manager and gather packages
                self.package_manager.gather_packages(str(installer_path))

                base_cmd = self.build_command(
                    str(installer_path.absolute()),
                    username=self.username,
                    password=self.password,
                    output_dir=str(qt_base_dir.absolute()),
                    no_unattended=self.no_unattended,
                )

                install_cmd = self.package_manager.get_install_command(self.modules, temp_dir)
                cmd = [*base_cmd, *install_cmd]

            log_cmd = cmd.copy()
            for i in range(len(log_cmd) - 1):
                if log_cmd[i] == "--email" or log_cmd[i] == "--pw":
                    log_cmd[i + 1] = "***"

            if not self.dry_run:
                self.logger.info(f"Running: {log_cmd}")
                safely_run(cmd, Settings.qt_installer_timeout)
            else:
                self.logger.info(f"Would run: {log_cmd}")

        except Exception as e:
            self.logger.error(f"Installation failed: {str(e)}")
            raise
        finally:
            self.logger.info("Qt installation completed successfully")

    def _get_package_name(self) -> str:
        qt_version = f"{self.version.major}{self.version.minor}{self.version.patch}"
        return f"qt.qt{self.version.major}.{qt_version}.{self.arch}"