# Copyright (c) 2018 Ultimaker B.V.
# Uranium is released under the terms of the LGPLv3 or higher.
from json import JSONDecodeError
from typing import Any, Dict, List, Optional, Set, Tuple, cast, TYPE_CHECKING
import json
import os
import shutil
import zipfile
import tempfile
import urllib.parse  # For interpreting escape characters using unquote_plus.

from PyQt5.QtCore import pyqtSlot, QObject, pyqtSignal, QUrl, pyqtProperty

from UM import i18nCatalog
from UM.Logger import Logger
from UM.Message import Message
from UM.MimeTypeDatabase import MimeTypeDatabase  # To get the type of container we're loading.
from UM.Resources import Resources
from UM.Version import Version as UMVersion

catalog = i18nCatalog("uranium")

if TYPE_CHECKING:
    from UM.Qt.QtApplication import QtApplication


class PackageManager(QObject):
    Version = 1

    def __init__(self, application: "QtApplication", parent: Optional[QObject] = None) -> None:
        super().__init__(parent)

        self._application = application
        self._container_registry = self._application.getContainerRegistry()
        self._plugin_registry = self._application.getPluginRegistry()

        # JSON files that keep track of all installed packages.
        self._user_package_management_file_path = None  # type: Optional[str]
        self._bundled_package_management_file_paths = []  # type: List[str]
        for search_path in Resources.getAllPathsForType(Resources.BundledPackages):
            if not os.path.isdir(search_path):
                continue

            # Load all JSON files that are located in the bundled_packages directory.
            for file_name in os.listdir(search_path):
                if not file_name.endswith(".json"):
                    continue
                file_path = os.path.join(search_path, file_name)
                if not os.path.isfile(file_path):
                    continue
                self._bundled_package_management_file_paths.append(file_path)
                Logger.log("i", "Found bundled packages JSON file: {location}".format(location = file_path))

        for search_path in (Resources.getDataStoragePath(), Resources.getConfigStoragePath()):
            candidate_user_path = os.path.join(search_path, "packages.json")
            if os.path.exists(candidate_user_path):
                self._user_package_management_file_path = candidate_user_path
        if self._user_package_management_file_path is None:  # Doesn't exist yet.
            self._user_package_management_file_path = os.path.join(Resources.getDataStoragePath(), "packages.json")

        self._installation_dirs_dict = {"plugins": os.path.abspath(Resources.getStoragePath(Resources.Plugins))}  # type: Dict[str, str]

        self._bundled_package_dict = {}  # type: Dict[str, Dict[str, Any]] # A dict of all bundled packages
        self._installed_package_dict = {}  # type: Dict[str, Dict[str, Any]] # A dict of all installed packages
        self._to_remove_package_set = set()  # type: Set[str] # A set of packages that need to be removed at the next start
        self._to_install_package_dict = {}  # type: Dict[str, Dict[str, Any]]  # A dict of packages that need to be installed at the next start

        # There can be plugins that provide remote packages (and thus, newer / different versions for a package).
        self._available_package_versions = {}  # type: Dict[str, Set[UMVersion]]

        self._packages_with_update_available = set()  # type: Set[str]

    installedPackagesChanged = pyqtSignal()  # Emitted whenever the installed packages collection have been changed.
    packagesWithUpdateChanged = pyqtSignal()

    def initialize(self) -> None:
        self._loadManagementData()
        self._removeAllScheduledPackages()
        self._installAllScheduledPackages()

    # Notify the Package manager that there is an alternative version for a given package.
    def addAvailablePackageVersion(self, package_id: str, version: "UMVersion") -> None:
        if package_id not in self._available_package_versions:
            self._available_package_versions[package_id] = set()
        self._available_package_versions[package_id].add(version)

        if self.checkIfPackageCanUpdate(package_id):
            self._packages_with_update_available.add(package_id)
            self.packagesWithUpdateChanged.emit()

    @pyqtProperty("QStringList", notify = packagesWithUpdateChanged)
    def packagesWithUpdate(self) -> Set[str]:
        return self._packages_with_update_available

    def checkIfPackageCanUpdate(self, package_id: str) -> bool:
        available_versions = self._available_package_versions.get(package_id)

        if available_versions is None:
            return False

        current_version = None

        bundled_package_dict = self._bundled_package_dict.get(package_id)
        if bundled_package_dict is not None:
            current_version = UMVersion(bundled_package_dict["package_info"]["package_version"])

        installed_package_dict = self._installed_package_dict.get(package_id)
        if installed_package_dict is not None:
            current_version = UMVersion(installed_package_dict["package_info"]["package_version"])

            # One way to check if the package has been updated in looking at the to_install information in the packages.json
            to_install_package_dict = self._to_install_package_dict.get(package_id)
            if to_install_package_dict is not None: # If it's marked as to_install, that means package will be installed upon restarting
                    return False

        if current_version is not None:
            for available_version in available_versions:
                if current_version < available_version:
                    # Stop looking, there is at least one version that is higher.
                    return True
        return False

    # (for initialize) Loads the package management file if exists
    def _loadManagementData(self) -> None:
        # The bundled package management file should always be there
        if len(self._bundled_package_management_file_paths) == 0:
            Logger.log("w", "Bundled package management files could not be found!")
            return
        # Load the bundled packages:
        self._bundled_package_dict = {}
        for search_path in self._bundled_package_management_file_paths:
            with open(search_path, "r", encoding = "utf-8") as f:
                self._bundled_package_dict.update(json.load(f, encoding = "utf-8"))
                Logger.log("i", "Loaded bundled packages data from %s", search_path)

        # Need to use the file lock here to prevent concurrent I/O from other processes/threads
        container_registry = self._application.getContainerRegistry()
        with container_registry.lockFile():
            try:
                # Load the user packages:
                with open(cast(str, self._user_package_management_file_path), "r", encoding="utf-8") as f:
                    try:
                        management_dict = json.load(f, encoding="utf-8")
                    except JSONDecodeError:
                        # The file got corrupted, ignore it. This happens extremely infrequently.
                        # The file will get overridden once a user downloads something.
                        return
                    self._installed_package_dict = management_dict.get("installed", {})
                    self._to_remove_package_set = set(management_dict.get("to_remove", []))
                    self._to_install_package_dict = management_dict.get("to_install", {})
                    Logger.log("i", "Loaded user packages management file from %s", self._user_package_management_file_path)
            except FileNotFoundError:
                Logger.log("i", "User package management file %s doesn't exist, do nothing", self._user_package_management_file_path)
                return

        # For packages that become bundled in the new releases, but a lower version was installed previously, we need
        # to remove the old lower version that's installed in the user's folder.
        for package_id, installed_package_dict in self._installed_package_dict.items():
            bundled_package_dict = self._bundled_package_dict.get(package_id)
            if bundled_package_dict is None:
                continue

            result = self._comparePackageVersions(installed_package_dict["package_info"],
                                                  bundled_package_dict["package_info"])
            # The bundled package is newer
            if result <= 0:
                self._to_remove_package_set.add(package_id)
                continue

        # Also check the to-install packages to avoid installing packages that have a lower version than the bundled
        # ones.
        to_remove_package_ids = set()
        for package_id, to_install_package_dict in self._to_install_package_dict.items():
            bundled_package_dict = self._bundled_package_dict.get(package_id)
            if bundled_package_dict is None:
                continue

            result = self._comparePackageVersions(to_install_package_dict["package_info"],
                                                  bundled_package_dict["package_info"])
            # The bundled package is newer
            if result <= 0:
                to_remove_package_ids.add(package_id)
                continue
        for package_id in to_remove_package_ids:
            del self._to_install_package_dict[package_id]

    # Compares the SDK versions and the package versions of the two given package info dicts.
    # Returns -1, 0, 1 indicating if the versions in dict1 is lower than, equal to, or higher than dict2.
    #  - The package with the higher SDK version is considered having the higher version number. If they are the same,
    #  - if the bundled package version is greater than or equal to the given package, -1 is returned. Otherwise, 1.
    def _comparePackageVersions(self, info_dict1: Dict[str, Any], info_dict2: Dict[str, Any]) -> int:
        # If the bundled version has a higher SDK version, use the bundled version by removing the installed one.
        sdk_version1 = UMVersion(info_dict1["sdk_version"])
        sdk_version2 = UMVersion(info_dict2["sdk_version"])
        if sdk_version1 < sdk_version2:
            return -1

        # Remove the package with the old version to favour the newer bundled version.
        version1 = UMVersion(info_dict1["package_version"])
        version2 = UMVersion(info_dict2["package_version"])
        if version1 < version2:
            return -1

        if version1 == version2:
            return 0

        return 1

    def _saveManagementData(self) -> None:
        # Need to use the file lock here to prevent concurrent I/O from other processes/threads
        container_registry = self._application.getContainerRegistry()
        with container_registry.lockFile():
            with open(cast(str,self._user_package_management_file_path), "w", encoding = "utf-8") as f:
                data_dict = {"version": PackageManager.Version,
                             "installed": self._installed_package_dict,
                             "to_remove": list(self._to_remove_package_set),
                             "to_install": self._to_install_package_dict}
                json.dump(data_dict, f, sort_keys = True, indent = 4)
                Logger.log("i", "Package management file %s was saved", self._user_package_management_file_path)

    # (for initialize) Removes all packages that have been scheduled to be removed.
    def _removeAllScheduledPackages(self) -> None:
        remove_failures = set()
        for package_id in self._to_remove_package_set:
            try:
                self._purgePackage(package_id)
                del self._installed_package_dict[package_id]
            except:
                remove_failures.add(package_id)

        if remove_failures:
            message = Message(catalog.i18nc("@error:uninstall",
                                            "There were some errors uninstalling the following packages:\n{packages}".format(
                                            packages = "- " + "\n- ".join(remove_failures))),
                              title = catalog.i18nc("@info:title", "Uninstalling errors"))
            message.show()

        self._to_remove_package_set = remove_failures
        self._saveManagementData()

    # (for initialize) Installs all packages that have been scheduled to be installed.
    def _installAllScheduledPackages(self) -> None:
        while self._to_install_package_dict:
            package_id, package_info = list(self._to_install_package_dict.items())[0]
            self._installPackage(package_info)
            del self._to_install_package_dict[package_id]
            self._saveManagementData()

    def getBundledPackageInfo(self, package_id: str) -> Optional[Dict[str, Any]]:
        package_info = None
        if package_id in self._bundled_package_dict:
            package_info = self._bundled_package_dict[package_id]["package_info"]
        return package_info

    # Checks the given package is installed. If so, return a dictionary that contains the package's information.
    def getInstalledPackageInfo(self, package_id: str) -> Optional[Dict[str, Any]]:
        if package_id in self._to_remove_package_set:
            return None

        package_info = None
        if package_id in self._to_install_package_dict:
            package_info = self._to_install_package_dict[package_id]["package_info"]
            package_info["is_installed"] = False
        elif package_id in self._installed_package_dict:
            package_info = self._installed_package_dict[package_id]["package_info"]
            package_info["is_installed"] = True
        elif package_id in self._bundled_package_dict:
            package_info = self._bundled_package_dict[package_id]["package_info"]
            package_info["is_installed"] = True

        if package_info:
            # We also need to get information from the plugin registry such as if a plugin is active
            package_info["is_active"] = self._plugin_registry.isActivePlugin(package_id)
            # If the package ID is in bundled, label it as such
            package_info["is_bundled"] = package_info["package_id"] in self._bundled_package_dict.keys() and not self.isUserInstalledPackage(package_info["package_id"])

        return package_info

    def getAllInstalledPackageIDs(self) -> Set[str]:
        # Add bundled, installed, and to-install packages to the set of installed package IDs
        all_installed_ids = set()  # type: Set[str]

        if self._bundled_package_dict.keys():
            all_installed_ids = all_installed_ids.union(set(self._bundled_package_dict.keys()))
        if self._installed_package_dict.keys():
            all_installed_ids = all_installed_ids.union(set(self._installed_package_dict.keys()))
        all_installed_ids = all_installed_ids.difference(self._to_remove_package_set)
        # If it's going to be installed and to be removed, then the package is being updated and it should be listed.
        if self._to_install_package_dict.keys():
            all_installed_ids = all_installed_ids.union(set(self._to_install_package_dict.keys()))

        return all_installed_ids

    def getAllInstalledPackagesInfo(self) -> Dict[str, List[Dict[str, Any]]]:

        all_installed_ids = self.getAllInstalledPackageIDs()

        # map of <package_type> -> <package_id> -> <package_info>
        installed_packages_dict = {}  # type: Dict[str, List[Dict[str, Any]]]
        for package_id in all_installed_ids:
            # Skip required plugins as they should not be tampered with
            if package_id in self._application.getRequiredPlugins():
                continue

            package_info = self.getInstalledPackageInfo(package_id)

            if package_info is None:
                continue

            # If there is not a section in the dict for this type, add it
            if package_info["package_type"] not in installed_packages_dict:
                installed_packages_dict[package_info["package_type"]] = []

            # Finally, add the data
            installed_packages_dict[package_info["package_type"]].append(package_info)

        return installed_packages_dict

    def getToRemovePackageIDs(self) -> Set[str]:
        return self._to_remove_package_set

    # Checks if the given package is installed (at all).
    def isPackageInstalled(self, package_id: str) -> bool:
        return self.getInstalledPackageInfo(package_id) is not None

    # This is called by drag-and-dropping curapackage files.
    @pyqtSlot(QUrl)
    def installPackageViaDragAndDrop(self, file_url: str) -> None:
        filename = QUrl(file_url).toLocalFile()
        return self.installPackage(filename)

    # Schedules the given package file to be installed upon the next start.
    @pyqtSlot(str)
    def installPackage(self, filename: str) -> None:
        has_changes = False
        package_id = ""
        try:
            # Get package information
            package_info = self.getPackageInfo(filename)
            if not package_info:
                return
            package_id = package_info["package_id"]

            # If the package is being installed but it is in the list on to remove, then it is deleted from that list.
            if package_id in self._to_remove_package_set:
                self._to_remove_package_set.remove(package_id)

            # We do not check if the same package has been installed already here because, for example, in Cura,
            # it may need to install a package with the same package-version but with a higher SDK version. So,
            # the package-version is not the only version that can be in play here.

            # Need to use the lock file to prevent concurrent I/O issues.
            with self._container_registry.lockFile():
                Logger.log("i", "Package [%s] version [%s] is scheduled to be installed.",
                           package_id, package_info["package_version"])
                # Copy the file to cache dir so we don't need to rely on the original file to be present
                package_cache_dir = os.path.join(os.path.abspath(Resources.getCacheStoragePath()), "cura_packages")
                if not os.path.exists(package_cache_dir):
                    os.makedirs(package_cache_dir, exist_ok=True)

                target_file_path = os.path.join(package_cache_dir, package_id + ".curapackage")
                shutil.copy2(filename, target_file_path)

                self._to_install_package_dict[package_id] = {"package_info": package_info,
                                                             "filename": target_file_path}
                has_changes = True
        except:
            Logger.logException("c", "Failed to install package file '%s'", filename)
        finally:
            self._saveManagementData()
            if has_changes:
                self.installedPackagesChanged.emit()

                if package_id in self._packages_with_update_available:
                    # After installing the update, the check will return that not other updates are available.
                    # In that case we remove it from the list. This is actually a safe check (could be removed)
                    if not self.checkIfPackageCanUpdate(package_id):
                        # The install ensured that the package no longer has a valid update option.
                        self._packages_with_update_available.remove(package_id)
                        self.packagesWithUpdateChanged.emit()

    # Schedules the given package to be removed upon the next start.
    # \param package_id id of the package
    # \param force_add is used when updating. In that case you actually want to uninstall & install
    @pyqtSlot(str)
    def removePackage(self, package_id: str, force_add: bool = False) -> None:
        # Check the delayed installation and removal lists first
        if not self.isPackageInstalled(package_id):
            Logger.log("i", "Attempt to remove package [%s] that is not installed, do nothing.", package_id)
            return
        # Extra safety check
        if package_id not in self._installed_package_dict and package_id in self._bundled_package_dict:
            Logger.log("i", "Not uninstalling [%s] because it is a bundled package.")
            return

        if package_id not in self._to_install_package_dict or force_add:
            # Schedule for a delayed removal:
            self._to_remove_package_set.add(package_id)
        else:
            if package_id in self._to_install_package_dict:
                # Remove from the delayed installation list if present
                del self._to_install_package_dict[package_id]
        self._saveManagementData()
        self.installedPackagesChanged.emit()

        # It might be that a certain update is suddenly available again!
        if self.checkIfPackageCanUpdate(package_id):
            self._packages_with_update_available.add(package_id)
            self.packagesWithUpdateChanged.emit()

    ##  Is the package an user installed package?
    def isUserInstalledPackage(self, package_id: str) -> bool:
        return package_id in self._installed_package_dict

    # Removes everything associated with the given package ID.
    def _purgePackage(self, package_id: str) -> None:
        # Iterate through all directories in the data storage directory and look for sub-directories that belong to
        # the package we need to remove, that is the sub-dirs with the package_id as names, and remove all those dirs.
        data_storage_dir = os.path.abspath(Resources.getDataStoragePath())

        for root, dir_names, _ in os.walk(data_storage_dir):
            for dir_name in dir_names:
                package_dir = os.path.join(root, dir_name, package_id)
                if os.path.exists(package_dir):
                    Logger.log("i", "Removing '%s' for package [%s]", package_dir, package_id)
                    shutil.rmtree(package_dir)
            break

    # Installs all files associated with the given package.
    def _installPackage(self, installation_package_data: Dict[str, Any]) -> None:
        package_info = installation_package_data["package_info"]
        filename = installation_package_data["filename"]

        package_id = package_info["package_id"]
        Logger.log("i", "Installing package [%s] from file [%s]", package_id, filename)

        # Load the cached package file and extract all contents to a temporary directory
        if not os.path.exists(filename):
            Logger.log("w", "Package [%s] file '%s' is missing, cannot install this package", package_id, filename)
            return
        try:
            with zipfile.ZipFile(filename, "r") as archive:
                temp_dir = tempfile.TemporaryDirectory()
                archive.extractall(temp_dir.name)
        except Exception:
            Logger.logException("e", "Failed to install package from file [%s]", filename)
            return

        # Remove it first and then install
        try:
            self._purgePackage(package_id)
        except Exception as e:
            message = Message(catalog.i18nc("@error:update",
                                            "There was an error uninstalling the package {package} before installing "
                                            "new version:\n{error}.\nPlease try to upgrade again later.".format(
                                            package = package_id, error = str(e))),
                              title = catalog.i18nc("@info:title", "Updating error"))
            message.show()
            return

        # Copy the folders there
        for sub_dir_name, installation_root_dir in self._installation_dirs_dict.items():
            src_dir_path = os.path.join(temp_dir.name, "files", sub_dir_name)
            dst_dir_path = os.path.join(installation_root_dir, package_id)

            if not os.path.exists(src_dir_path):
                Logger.log("w", "The path %s does not exist, so not installing the files", src_dir_path)
                continue
            self.__installPackageFiles(package_id, src_dir_path, dst_dir_path)

        # Remove the file
        try:
            os.remove(filename)
        except Exception:
            Logger.log("w", "Tried to delete file [%s], but it failed", filename)

        # Move the info to the installed list of packages only when it succeeds
        self._installed_package_dict[package_id] = self._to_install_package_dict[package_id]
        self._installed_package_dict[package_id]["package_info"]["is_installed"] = True

    def __installPackageFiles(self, package_id: str, src_dir: str, dst_dir: str) -> None:
        Logger.log("i", "Moving package {package_id} from {src_dir} to {dst_dir}".format(package_id=package_id, src_dir=src_dir, dst_dir=dst_dir))
        try:
            shutil.move(src_dir, dst_dir)
        except FileExistsError:
            Logger.log("w", "Not moving %s to %s as the destination already exists", src_dir, dst_dir)

    # Gets package information from the given file.
    def getPackageInfo(self, filename: str) -> Dict[str, Any]:
        package_json = {}  # type: Dict[str, Any]
        try:
            with zipfile.ZipFile(filename) as archive:
                # Go through all the files and use the first successful read as the result
                for file_info in archive.infolist():
                    if file_info.filename.endswith("package.json"):
                        Logger.log("d", "Found potential package.json file '%s'", file_info.filename)
                        try:
                            with archive.open(file_info.filename, "r") as f:
                                package_json = json.loads(f.read().decode("utf-8"))

                            # Add by default properties
                            package_json["is_active"] = True
                            package_json["is_bundled"] = False
                            package_json["is_installed"] = False
                            break
                        except:
                            Logger.logException("e", "Failed to load potential package.json file '%s' as text file.",
                                                file_info.filename)
        except zipfile.BadZipFile:
            Logger.logException("e", "Failed to unpack the file %s", filename)
        return package_json

    # Gets the license file content if present in the given package file.
    # Returns None if there is no license file found.
    def getPackageLicense(self, filename: str) -> Optional[str]:
        license_string = None
        with zipfile.ZipFile(filename) as archive:
            # Go through all the files and use the first successful read as the result
            for file_info in archive.infolist():
                if file_info.filename.endswith("LICENSE"):
                    Logger.log("d", "Found potential license file '%s'", file_info.filename)
                    try:
                        with archive.open(file_info.filename, "r") as f:
                            data = f.read()
                        license_string = data.decode("utf-8")
                        break
                    except:
                        Logger.logException("e", "Failed to load potential license file '%s' as text file.",
                                            file_info.filename)
                        license_string = None
        return license_string

    ##  Find the package files by package_id by looking at the installed folder
    @staticmethod
    def getPackageFiles(package_id) -> List[Tuple[str, List[str]]]:
        data_storage_dir = os.path.abspath(Resources.getDataStoragePath())

        os_walk = []
        dirs_to_check = []
        result = []  # 2-tuples of (dir, file_names)
        for root_path, dir_names, file_names in os.walk(data_storage_dir):
            os_walk.append((root_path, dir_names, file_names))
            for dir_name in dir_names:
                package_dir = os.path.join(root_path, dir_name, package_id)
                if os.path.exists(package_dir):
                    dirs_to_check.append(package_dir)

        for root_path, dir_names, file_names in os_walk:
            for dir_to_check in dirs_to_check:
                if root_path.startswith(dir_to_check):
                    result.append((root_path, file_names))

        return result

    ##  Return container ids for contents found with package_id
    @staticmethod
    def getPackageContainerIds(package_id: str) -> List[str]:
        package_files = PackageManager.getPackageFiles(package_id)
        ids = []
        for root_path, file_names in package_files:
            for file_name in file_names:
                path = os.path.join(root_path, file_name)
                id = PackageManager.convertPathToId(path)
                if id:
                    ids.append(id)
        return ids

    ##  Try to return Id for given path by looking at its existence in the mimetype database
    @staticmethod
    def convertPathToId(path: str) -> str:
        mime = None
        try:
            mime = MimeTypeDatabase.getMimeTypeForFile(path)
        except MimeTypeDatabase.MimeTypeNotFoundError:
            pass
        if mime:
            return urllib.parse.unquote_plus(mime.stripExtension(os.path.basename(path)))
        else:
            return ""


__all__ = ["PackageManager"]
