# Copyright (c) 2018 Ultimaker B.V.
# Cura is released under the terms of the LGPLv3 or higher.

import re
from typing import Dict

from PyQt5.QtCore import Qt, pyqtProperty
from UM.Qt.ListModel import ListModel
from .ConfigsModel import ConfigsModel

##  Model that holds cura packages. By setting the filter property the instances held by this model can be changed.
class PackagesModel(ListModel):
    def __init__(self, parent = None):
        super().__init__(parent)

        self._metadata = None

        self.addRoleName(Qt.UserRole + 1, "id")
        self.addRoleName(Qt.UserRole + 2, "type")
        self.addRoleName(Qt.UserRole + 3, "name")
        self.addRoleName(Qt.UserRole + 4, "version")
        self.addRoleName(Qt.UserRole + 5, "author_id")
        self.addRoleName(Qt.UserRole + 6, "author_name")
        self.addRoleName(Qt.UserRole + 7, "author_email")
        self.addRoleName(Qt.UserRole + 8, "description")
        self.addRoleName(Qt.UserRole + 9, "icon_url")
        self.addRoleName(Qt.UserRole + 10, "image_urls")
        self.addRoleName(Qt.UserRole + 11, "download_url")
        self.addRoleName(Qt.UserRole + 12, "last_updated")
        self.addRoleName(Qt.UserRole + 13, "is_bundled")
        self.addRoleName(Qt.UserRole + 14, "is_enabled")
        self.addRoleName(Qt.UserRole + 15, "is_installed") # Scheduled pkgs are included in the model but should not be marked as actually installed
        self.addRoleName(Qt.UserRole + 16, "has_configs")
        self.addRoleName(Qt.UserRole + 17, "supported_configs")
        self.addRoleName(Qt.UserRole + 18, "download_count")
        self.addRoleName(Qt.UserRole + 19, "tags")

        # List of filters for queries. The result is the union of the each list of results.
        self._filter = {}  # type: Dict[str, str]

    def setMetadata(self, data):
        self._metadata = data
        self._update()

    def _update(self):
        items = []

        for package in self._metadata:

            has_configs = False
            configs_model = None
            if "data" in package:
                if "supported_configs" in package["data"]:
                    if len(package["data"]["supported_configs"]) > 0:
                        has_configs = True
                        configs_model = ConfigsModel()
                        configs_model.setConfigs(package["data"]["supported_configs"])

            if "author_id" not in package["author"] or "display_name" not in package["author"]:
                package["author"]["author_id"] = ""
                package["author"]["display_name"] = ""
                # raise Exception("Detected a package with malformed author data.")

            items.append({
                "id":                package["package_id"],
                "type":              package["package_type"],
                "name":              package["display_name"],
                "version":           package["package_version"],
                "author_id":         package["author"]["author_id"],
                "author_name":       package["author"]["display_name"],
                "author_email":      package["author"]["email"] if "email" in package["author"] else None,
                "description":       package["description"] if "description" in package else None,
                "icon_url":          package["icon_url"] if "icon_url" in package else None,
                "image_urls":        package["image_urls"] if "image_urls" in package else None,
                "download_url":      package["download_url"] if "download_url" in package else None,
                "last_updated":      package["last_updated"] if "last_updated" in package else None,
                "is_bundled":        package["is_bundled"] if "is_bundled" in package else False,
                "is_enabled":        package["is_enabled"] if "is_enabled" in package else False,
                "is_installed":      package["is_installed"] if "is_installed" in package else False,
                "has_configs":       has_configs,
                "supported_configs": configs_model,
                "download_count":    package["download_count"] if "download_count" in package else 0,
                "tags":              package["tags"] if "tags" in package else []
            })

        # Filter on all the key-word arguments.
        for key, value in self._filter.items():
            if key is "tags":
                key_filter = lambda item, value = value: value in item["tags"]
            elif "*" in value:
                key_filter = lambda candidate, key = key, value = value: self._matchRegExp(candidate, key, value)
            else:
                key_filter = lambda candidate, key = key, value = value: self._matchString(candidate, key, value)
            items = filter(key_filter, items)

        # Execute all filters.
        filtered_items = list(items)

        filtered_items.sort(key = lambda k: k["name"])
        self.setItems(filtered_items)

    ##  Set the filter of this model based on a string.
    #   \param filter_dict \type{Dict} Dictionary to do the filtering by.
    def setFilter(self, filter_dict: Dict[str, str]) -> None:
        if filter_dict != self._filter:
            self._filter = filter_dict
            self._update()

    @pyqtProperty("QVariantMap", fset = setFilter, constant = True)
    def filter(self) -> Dict[str, str]:
        return self._filter

    # Check to see if a container matches with a regular expression
    def _matchRegExp(self, metadata, property_name, value):
        if property_name not in metadata:
            return False
        value = re.escape(value) #Escape for regex patterns.
        value = "^" + value.replace("\\*", ".*") + "$" #Instead of (now escaped) asterisks, match on any string. Also add anchors for a complete match.
        if self._ignore_case:
            value_pattern = re.compile(value, re.IGNORECASE)
        else:
            value_pattern = re.compile(value)

        return value_pattern.match(str(metadata[property_name]))

    # Check to see if a container matches with a string
    def _matchString(self, metadata, property_name, value):
        if property_name not in metadata:
            return False
        return value.lower() == str(metadata[property_name]).lower()