#!/usr/bin/env  python
# vim:fileencoding=utf-8
from __future__ import (unicode_literals, division, absolute_import,
                        print_function)

__license__   = 'GPL v3'
__copyright__ = '2013, Kovid Goyal kovid@kovidgoyal.net'
__docformat__ = 'restructuredtext en'


from PyQt4.Qt import (Qt, QDialog, QAbstractItemView, QTableWidgetItem,
                      QByteArray)

from calibre.gui2 import gprefs, error_dialog
from calibre.gui2.dialogs.match_books_ui import Ui_MatchBooks
from calibre.utils.icu import sort_key

class TableItem(QTableWidgetItem):
    '''
    A QTableWidgetItem that sorts on a separate string and uses ICU rules
    '''

    def __init__(self, val, sort, idx=0):
        self.sort = sort
        self.sort_idx = idx
        QTableWidgetItem.__init__(self, val)
        self.setFlags(Qt.ItemIsEnabled|Qt.ItemIsSelectable)

    def __ge__(self, other):
        l = sort_key(self.sort)
        r = sort_key(other.sort)
        if l > r:
            return 1
        if l == r:
            return self.sort_idx >= other.sort_idx
        return 0

    def __lt__(self, other):
        l = sort_key(self.sort)
        r = sort_key(other.sort)
        if l < r:
            return 1
        if l == r:
            return self.sort_idx < other.sort_idx
        return 0

class MatchBooks(QDialog, Ui_MatchBooks):

    def __init__(self, gui, view, id_):
        QDialog.__init__(self, gui, flags=Qt.Window)
        Ui_MatchBooks.__init__(self)
        self.setupUi(self)
        self.isClosed = False

        self.books_table_column_widths = None
        try:
            self.books_table_column_widths = \
                        gprefs.get('match_books_dialog_books_table_widths', None)
            geom = gprefs.get('match_books_dialog_geometry', bytearray(''))
            self.restoreGeometry(QByteArray(geom))
        except:
            pass

        self.search_text.initialize('match_books_dialog')

        # Remove the help button from the window title bar
        icon = self.windowIcon()
        self.setWindowFlags(self.windowFlags()&(~Qt.WindowContextHelpButtonHint))
        self.setWindowIcon(icon)

        self.device_db = view.model().db
        self.library_db = gui.library_view.model().db
        self.view = view
        self.gui = gui
        self.current_device_book_id = id_
        self.current_library_book_id = None

        # Set up the books table columns
        self.books_table.setSelectionBehavior(QAbstractItemView.SelectRows)
        self.books_table.setSelectionMode(QAbstractItemView.SingleSelection)
        self.books_table.setColumnCount(3)
        t = QTableWidgetItem(_('Title'))
        self.books_table.setHorizontalHeaderItem(0, t)
        t = QTableWidgetItem(_('Authors'))
        self.books_table.setHorizontalHeaderItem(1, t)
        t = QTableWidgetItem(_('Series'))
        self.books_table.setHorizontalHeaderItem(2, t)
        self.books_table_header_height = self.books_table.height()
        self.books_table.cellDoubleClicked.connect(self.book_doubleclicked)
        self.books_table.cellClicked.connect(self.book_clicked)
        self.books_table.sortByColumn(0, Qt.AscendingOrder)

        # get the standard table row height. Do this here because calling
        # resizeRowsToContents can word wrap long cell contents, creating
        # double-high rows
        self.books_table.setRowCount(1)
        self.books_table.setItem(0, 0, TableItem('A', ''))
        self.books_table.resizeRowsToContents()
        self.books_table_row_height = self.books_table.rowHeight(0)
        self.books_table.setRowCount(0)

        self.search_button.clicked.connect(self.do_search)
        self.search_button.setDefault(False)
        self.search_text.lineEdit().returnPressed.connect(self.return_pressed)

        self.buttonBox.accepted.connect(self.accept)
        self.buttonBox.rejected.connect(self.reject)
        self.ignore_next_key = False

        self.search_text.setText(self.device_db[self.current_device_book_id].title)

    def return_pressed(self):
        self.ignore_next_key = True
        self.do_search()

    def keyPressEvent(self, e):
        if self.ignore_next_key:
            self.ignore_next_key = False
        else:
            QDialog.keyPressEvent(self, e)

    def do_search(self):
        query = unicode(self.search_text.text())
        if not query:
            d = error_dialog(self.gui, _('Match books'),
                     _('You must enter a search expression into the search box'))
            d.exec_()
            return
        books = self.library_db.data.search(query, return_matches=True)
        self.books_table.setRowCount(len(books))

        self.books_table.setSortingEnabled(False)
        for row, b in enumerate(books):
            mi = self.library_db.get_metadata(b, index_is_id=True, get_user_categories=False)
            a = TableItem(mi.title, mi.title_sort)
            a.setData(Qt.UserRole, b)
            self.books_table.setItem(row, 0, a)
            a = TableItem(' & '.join(mi.authors), mi.author_sort)
            self.books_table.setItem(row, 1, a)
            series = mi.format_field('series')[1]
            if series is None:
                series = ''
            a = TableItem(series, mi.series, mi.series_index)
            self.books_table.setItem(row, 2, a)
            self.books_table.setRowHeight(row, self.books_table_row_height)

        self.books_table.setSortingEnabled(True)

    # Deal with sizing the table columns. Done here because the numbers are not
    # correct until the first paint.
    def resizeEvent(self, *args):
        QDialog.resizeEvent(self, *args)
        if self.books_table_column_widths is not None:
            for c,w in enumerate(self.books_table_column_widths):
                self.books_table.setColumnWidth(c, w)
        else:
            # the vertical scroll bar might not be rendered, so might not yet
            # have a width. Assume 25. Not a problem because user-changed column
            # widths will be remembered
            w = self.books_table.width() - 25 - self.books_table.verticalHeader().width()
            w /= self.books_table.columnCount()
            for c in range(0, self.books_table.columnCount()):
                self.books_table.setColumnWidth(c, w)
        self.save_state()

    def book_clicked(self, row, column):
        self.book_selected = True
        id_ = self.books_table.item(row, 0).data(Qt.UserRole).toInt()[0]
        self.current_library_book_id = id_

    def book_doubleclicked(self, row, column):
        self.book_clicked(row, column)
        self.accept()

    def save_state(self):
        self.books_table_column_widths = []
        for c in range(0, self.books_table.columnCount()):
            self.books_table_column_widths.append(self.books_table.columnWidth(c))
        gprefs['match_books_dialog_books_table_widths'] = self.books_table_column_widths
        gprefs['match_books_dialog_geometry'] = bytearray(self.saveGeometry())
        self.search_text.save_history()

    def close(self):
        self.save_state()
        # clean up to prevent memory leaks
        self.device_db = self.view = self.gui = None

    def accept(self):
        if not self.current_library_book_id:
            d = error_dialog(self.gui, _('Match books'),
                     _('You must select a matching book'))
            d.exec_()
            return
        mi = self.library_db.get_metadata(self.current_library_book_id,
                              index_is_id=True, get_user_categories=False)
        self.device_db[self.current_device_book_id].smart_update(mi, replace_metadata=True)
        self.device_db[self.current_device_book_id].in_library_waiting = True
        self.save_state()
        QDialog.accept(self)

    def reject(self):
        self.close()
        QDialog.reject(self)

