# -*- coding: utf-8 -*-

# pylint: disable=invalid-name

# -----------------------------------------------------------------------------
# Copyright (c) 2016-2017 Anaconda, Inc.
#
# May be copied and distributed freely only as part of an Anaconda or
# Miniconda installation.
# -----------------------------------------------------------------------------

"""Conda Packages Table model."""

from qtpy.QtCore import QAbstractTableModel, QModelIndex, Qt  # pylint: disable=no-name-in-module
from anaconda_navigator.utils import constants as C
from anaconda_navigator.utils import sort_versions
from anaconda_navigator.utils.styles import SASS_VARIABLES


class CondaPackagesModel(QAbstractTableModel):  # pylint: disable=too-many-public-methods
    """Abstract Model to handle the packages in a conda environment."""

    def __init__(self, parent, packages, data):
        """Abstract Model to handle the packages in a conda environment."""
        super().__init__(parent)
        self._parent = parent
        self._packages = packages
        self._rows = data
        self._name_to_index = {r[C.COL_NAME]: i for i, r in enumerate(data)}
        self._palette = SASS_VARIABLES.process_palette()

    def _update_cell(self, row, column):
        start = self.index(row, column)
        end = self.index(row, column)
        self.dataChanged.emit(start, end)

    @staticmethod
    def flags(index):
        """Override Qt method."""
        column = index.column()
        if index.isValid() and (column in [C.COL_START, C.COL_END]):
            return Qt.ItemFlags(Qt.ItemIsEnabled)
        return Qt.ItemFlags(Qt.ItemIsEnabled)

    def data(  # pylint: disable=too-many-branches,too-many-return-statements,too-many-statements
            self, index, role=Qt.DisplayRole,
    ):
        """Override Qt method."""
        if not index.isValid() or not 0 <= index.row() < len(self._rows):
            return None

        row = index.row()
        column = index.column()

        P = self._palette  # Include the _palette directly here.

        if self._rows[row] == row:
            action = C.ACTION_NONE
            type_ = ''
            name = ''
            description = ''
            version = '-'
            status = -1
        else:
            action = self._rows[row][C.COL_ACTION]
            type_ = self._rows[row][C.COL_PACKAGE_TYPE]
            name = self._rows[row][C.COL_NAME]
            description = self._rows[row][C.COL_DESCRIPTION]
            version = self._rows[row][C.COL_VERSION]
            status = self._rows[row][C.COL_STATUS]

        is_upgradable = self.is_upgradable(self.index(row, C.COL_VERSION))

        if role == Qt.DisplayRole:
            if column == C.COL_PACKAGE_TYPE:
                return type_
            if column == C.COL_NAME:
                return name
            if column == C.COL_VERSION:
                return version
            if column == C.COL_STATUS:
                return status
            if column == C.COL_DESCRIPTION:
                return description
            if column == C.COL_ACTION:
                return action
        elif role == Qt.TextAlignmentRole:
            if column in [C.COL_NAME, C.COL_DESCRIPTION]:
                return int(Qt.AlignLeft | Qt.AlignVCenter)
            if column in [C.COL_VERSION]:
                return int(Qt.AlignLeft | Qt.AlignVCenter)
            return int(Qt.AlignCenter)

        elif role == Qt.DecorationRole:
            if column == C.COL_ACTION:
                if action == C.ACTION_NONE:
                    if status == C.NOT_INSTALLED:
                        return P['ICON_ACTION_NOT_INSTALLED']
                    if status in [C.UPGRADABLE, C.MIXGRADABLE]:
                        return P['ICON_ACTION_INSTALLED']
                    if status in [C.INSTALLED, C.DOWNGRADABLE, C.MIXGRADABLE]:
                        return P['ICON_ACTION_INSTALLED']
                elif action == C.ACTION_INSTALL:
                    return P['ICON_ACTION_ADD']
                elif action == C.ACTION_REMOVE:
                    return P['ICON_ACTION_REMOVE']
                elif action == C.ACTION_UPGRADE:
                    return P['ICON_ACTION_UPGRADE']
                elif action == C.ACTION_UPDATE:
                    return P['ICON_ACTION_UPGRADE']
                elif action == C.ACTION_DOWNGRADE:
                    return P['ICON_ACTION_DOWNGRADE']
                else:
                    return None
            elif column == C.COL_PACKAGE_TYPE:
                if type_ == C.CONDA_PACKAGE:
                    return P['ICON_ANACONDA']
                if type_ == C.PIP_PACKAGE:
                    return P['ICON_PYTHON']
                return None
            elif column == C.COL_VERSION:
                if is_upgradable:
                    return P['ICON_UPGRADE_ARROW']
                return P['ICON_SPACER']

        elif role == Qt.ToolTipRole:
            if column == C.COL_PACKAGE_TYPE:
                if type_ == C.CONDA_PACKAGE:
                    return 'Conda package'
                if type_ == C.PIP_PACKAGE:
                    return 'Python package'
            elif (column == C.COL_VERSION) and is_upgradable:
                return 'Update available'

        elif role == Qt.ForegroundRole:
            if column in [C.COL_NAME, C.COL_DESCRIPTION]:
                if status in [C.NOT_INSTALLED]:
                    return P['COLOR_FOREGROUND_NOT_INSTALLED']

            elif (column in [C.COL_VERSION]) and is_upgradable:
                return P['COLOR_FOREGROUND_UPGRADE']

        elif (role == Qt.SizeHintRole) and (column in [C.ACTION_COLUMNS, C.COL_PACKAGE_TYPE]):
            return P['SIZE_ICONS']

        return None

    @staticmethod
    def headerData(section, orientation, role=Qt.DisplayRole):  # pylint: disable=too-many-return-statements
        """Override Qt method."""
        if orientation == Qt.Horizontal:
            if role == Qt.TextAlignmentRole:
                return int(Qt.AlignLeft | Qt.AlignVCenter)

            if (role == Qt.ToolTipRole) and (section == C.COL_PACKAGE_TYPE):
                return 'Package type: Conda, Pip'

            if role == Qt.DisplayRole:
                if section == C.COL_PACKAGE_TYPE:
                    return 'T'
                if section == C.COL_NAME:
                    return 'Name'
                if section == C.COL_VERSION:
                    return 'Version'
                if section == C.COL_DESCRIPTION:
                    return 'Description'
                if section == C.COL_STATUS:
                    return 'Status'
                return None

        return None

    def rowCount(self, index=QModelIndex()):  # pylint: disable=unused-argument
        """Override Qt method."""
        return len(self._rows)

    @staticmethod
    def columnCount(index=QModelIndex()):  # pylint: disable=unused-argument
        """Override Qt method."""
        return len(C.COLUMNS)

    def row(self, rownum):
        """Return the row data."""
        return self._rows[rownum]

    def first_index(self):
        """Return the first model index."""
        return self.index(0, 0)

    def last_index(self):
        """Return the last model index."""
        return self.index(self.rowCount() - 1, self.columnCount() - 1)

    def update_row_icon(self, row, column):
        """Update the model index icon."""
        if column in C.ACTION_COLUMNS:
            r = self._rows[row]
            actual_state = r[column]
            r[column] = not actual_state
            self._rows[row] = r
            self._update_cell(row, column)

    def is_installable(self, model_index):
        """Return if the pacakge index can be installed."""
        row = model_index.row()
        status = self._rows[row][C.COL_STATUS]
        return status == C.NOT_INSTALLED

    def is_removable(self, model_index):
        """Return if the installed pacakge index can be removed."""
        row = model_index.row()
        status = self._rows[row][C.COL_STATUS]
        return status in [C.UPGRADABLE, C.DOWNGRADABLE, C.INSTALLED, C.MIXGRADABLE]

    def is_upgradable(self, model_index):
        """Return if the installed pacakge index can be upgraded."""
        row = model_index.row()
        status = self._rows[row][C.COL_STATUS]
        return status in [C.UPGRADABLE, C.MIXGRADABLE]

    def is_downgradable(self, model_index):
        """Return if the installed pacakge index can be downgraded."""
        row = model_index.row()
        status = self._rows[row][C.COL_STATUS]
        return status in [C.DOWNGRADABLE, C.MIXGRADABLE]

    def action_status(self, model_index):
        """Return the current action status."""
        row = model_index.row()
        action_status = self._rows[row][C.COL_ACTION]
        return action_status

    def set_action_status(self, model_index, status, version=None):
        """Set index status action."""
        row = model_index.row()
        self._rows[row][C.COL_ACTION] = status
        self._rows[row][C.COL_ACTION_VERSION] = version
        self._update_cell(row, model_index.column())

    def clear_actions(self):
        """Clear the selected conda actions."""
        for i, row in enumerate(self._rows):
            row[C.COL_ACTION] = C.ACTION_NONE
            row[C.COL_ACTION_VERSION] = None
            self._update_cell(i, C.COL_ACTION)
            self._update_cell(i, C.COL_ACTION_VERSION)

    def count_remove_actions(self):
        """Return the number of conda remove actions selected."""
        count = 0
        for row in self._rows:
            action = row[C.COL_ACTION]
            type_ = row[C.COL_PACKAGE_TYPE]
            if (action == C.ACTION_REMOVE) and (type_ == C.CONDA_PACKAGE):
                count += 1
        return count

    def count_install_actions(self):
        """Return number of install/upgrade/downgrade actions selected."""
        count = 0
        for row in self._rows:
            type_ = row[C.COL_PACKAGE_TYPE]
            action = row[C.COL_ACTION]
            if (action in [C.ACTION_DOWNGRADE, C.ACTION_INSTALL, C.ACTION_UPGRADE]) and (type_ == C.CONDA_PACKAGE):
                count += 1
        return count

    def count_update_actions(self):
        """Return number of update (no version given) actions selected."""
        count = 0
        for row in self._rows:
            type_ = row[C.COL_PACKAGE_TYPE]
            action = row[C.COL_ACTION]
            if (action in [C.ACTION_UPDATE]) and (type_ == C.CONDA_PACKAGE):
                count += 1
        return count

    def get_actions(self):
        """Return the selected conda actions."""
        dic = {
            C.CONDA_PACKAGE: {
                C.ACTION_INSTALL: [],
                C.ACTION_REMOVE: [],
                C.ACTION_UPGRADE: [],
                C.ACTION_DOWNGRADE: [],
                C.ACTION_UPDATE: [],
            },
            C.PIP_PACKAGE: {
                C.ACTION_REMOVE: [],
            }
        }

        for row in self._rows:
            action = row[C.COL_ACTION]
            name = row[C.COL_NAME]
            type_ = row[C.COL_PACKAGE_TYPE]
            action_version = row[C.COL_ACTION_VERSION]
            current_version = self.get_package_version(name)

            if action != C.ACTION_NONE:
                version_from = current_version
                version_to = action_version
                dic[type_][action].append({
                    'name': name,
                    'version_from': version_from,
                    'version_to': version_to,
                })
        return dic

    def get_action_count(self):
        """Count selected actions."""
        count = 0
        for row in self._rows:  # pylint: disable=consider-using-enumerate
            action = row[C.COL_ACTION]

            if action != C.ACTION_NONE:
                count += 1
        return count

    def get_package_versions(self, name):
        """
        Return the package canonical name for a given package `name`.

        name : str
            Name of the package
        """
        package_data = self._packages.get(name)
        versions = []

        if package_data:
            versions = sort_versions(list(package_data.get('versions', [])))

        return versions

    def get_package_version(self, name):
        """Return the package version for a given package `name`."""
        if name in self._name_to_index:
            index = self._name_to_index[name]
            version = self.row(index)[C.COL_VERSION]
            return version.replace(C.UPGRADE_SYMBOL, '')
        return ''