#!/usr/bin/env python2
# vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai

__license__   = 'GPL v3'
__copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
__docformat__ = 'restructuredtext en'

'''
WARNING: The code in this module is deprecated. Use complete2.py instead. This
code remains here for legacy plugin support.
'''

from PyQt4.Qt import (QLineEdit, QAbstractListModel, Qt,
        QApplication, QCompleter)

from calibre.utils.icu import sort_key
from calibre.gui2 import NONE
from calibre.gui2.widgets import EnComboBox, LineEditECM

class CompleteModel(QAbstractListModel):

    def __init__(self, parent=None):
        QAbstractListModel.__init__(self, parent)
        self.items = []
        self.sorting = QCompleter.UnsortedModel

    def set_items(self, items):
        items = [unicode(x.strip()) for x in items]
        if len(items) < 2500:
            self.items = sorted(items, key=sort_key)
            self.sorting = QCompleter.UnsortedModel
        else:
            self.items = sorted(items, key=lambda x:x.lower())
            self.sorting = QCompleter.CaseInsensitivelySortedModel
        self.reset()

    def rowCount(self, *args):
        return len(self.items)

    def data(self, index, role):
        if role == Qt.DisplayRole:
            r = index.row()
            try:
                return self.items[r]
            except IndexError:
                pass
        return NONE


class MultiCompleteLineEdit(QLineEdit, LineEditECM):
    '''
    A line edit that completes on multiple items separated by a
    separator. Use the :meth:`update_items_cache` to set the list of
    all possible completions. Separator can be controlled with the
    :meth:`set_separator` and :meth:`set_space_before_sep` methods.

    A call to self.set_separator(None) will allow this widget to be used
    to complete non multiple fields as well.
    '''

    def __init__(self, parent=None, completer_widget=None):
        QLineEdit.__init__(self, parent)

        self.sep = ','
        self.space_before_sep = False
        self.add_separator = True
        self.original_cursor_pos = None

        self._model = CompleteModel(parent=self)
        self._completer = c = QCompleter(self._model, self)
        c.setWidget(self if completer_widget is None else completer_widget)
        c.setCompletionMode(QCompleter.PopupCompletion)
        c.setCaseSensitivity(Qt.CaseInsensitive)
        c.setModelSorting(self._model.sorting)
        c.setCompletionRole(Qt.DisplayRole)
        p = c.popup()
        p.setMouseTracking(True)
        p.entered.connect(self.item_entered)
        c.popup().setAlternatingRowColors(True)

        c.activated.connect(self.completion_selected,
                type=Qt.QueuedConnection)
        self.textEdited.connect(self.text_edited)

    # Interface {{{
    def update_items_cache(self, complete_items):
        self.all_items = complete_items

    def set_separator(self, sep):
        self.sep = sep

    def set_space_before_sep(self, space_before):
        self.space_before_sep = space_before

    def set_add_separator(self, what):
        self.add_separator = bool(what)

    # }}}

    def item_entered(self, idx):
        self._completer.popup().setCurrentIndex(idx)

    def text_edited(self, *args):
        self.update_completions()
        self._completer.complete()

    def update_completions(self):
        ' Update the list of completions '
        self.original_cursor_pos = cpos = self.cursorPosition()
        text = unicode(self.text())
        prefix = text[:cpos]
        self.current_prefix = prefix
        complete_prefix = prefix.lstrip()
        if self.sep:
            complete_prefix = prefix.split(self.sep)[-1].lstrip()
        self._completer.setCompletionPrefix(complete_prefix)

    def get_completed_text(self, text):
        'Get completed text in before and after parts'
        if self.sep is None:
            return text, ''
        else:
            cursor_pos = self.original_cursor_pos
            if cursor_pos is None:
                cursor_pos = self.cursorPosition()
            self.original_cursor_pos = None
            # Split text
            curtext = unicode(self.text())
            before_text = curtext[:cursor_pos]
            after_text = curtext[cursor_pos:].rstrip()
            # Remove the completion prefix from the before text
            before_text = self.sep.join(before_text.split(self.sep)[:-1]).rstrip()
            if before_text:
                # Add the separator to the end of before_text
                if self.space_before_sep:
                    before_text += ' '
                before_text += self.sep + ' '
            if self.add_separator or after_text:
                # Add separator to the end of completed text
                if self.space_before_sep:
                    text = text.rstrip() + ' '
                completed_text = text + self.sep + ' '
            else:
                completed_text = text
            return before_text + completed_text, after_text

    def completion_selected(self, text):
        before_text, after_text = self.get_completed_text(unicode(text))
        self.setText(before_text + after_text)
        self.setCursorPosition(len(before_text))

    @dynamic_property
    def all_items(self):
        def fget(self):
            return self._model.items
        def fset(self, items):
            self._model.set_items(items)
            self._completer.setModelSorting(self._model.sorting)
        return property(fget=fget, fset=fset)

class MultiCompleteComboBox(EnComboBox):

    def __init__(self, *args):
        EnComboBox.__init__(self, *args)
        self.le = MultiCompleteLineEdit(self, completer_widget=self)
        self.setLineEdit(self.le)

    def showPopup(self):
        c = self.le._completer
        v = c.currentCompletion()
        c.setCompletionPrefix('')
        c.complete()
        cs = c.caseSensitivity()
        i = 0
        while c.setCurrentRow(i):
            cr = c.currentIndex().data().toString()
            if cr.startsWith(v, cs):
                c.popup().setCurrentIndex(c.currentIndex())
                return
            i += 1
        c.setCurrentRow(0)

    def update_items_cache(self, complete_items):
        self.lineEdit().update_items_cache(complete_items)

    def set_separator(self, sep):
        self.lineEdit().set_separator(sep)

    def set_space_before_sep(self, space_before):
        self.lineEdit().set_space_before_sep(space_before)

    def set_add_separator(self, what):
        self.lineEdit().set_add_separator(what)

    def show_initial_value(self, what):
        what = unicode(what) if what else u''
        le = self.lineEdit()
        self.setEditText(what)
        le.selectAll()

if __name__ == '__main__':
    from PyQt4.Qt import QDialog, QVBoxLayout
    app = QApplication([])
    d = QDialog()
    d.setLayout(QVBoxLayout())
    le = MultiCompleteComboBox(d)
    d.layout().addWidget(le)
    items = ['one', 'otwo', 'othree', 'ooone', 'ootwo',
        'oothree']
    le.update_items_cache(items)
    le.show_initial_value('')
    d.exec_()
