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

__license__   = 'GPL v3'
__copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
__docformat__ = 'restructuredtext en'

import os
from functools import partial

from PyQt4.Qt import Qt, QMenu

from calibre.gui2 import error_dialog, config
from calibre.gui2.dialogs.metadata_single import MetadataSingleDialog
from calibre.gui2.dialogs.metadata_bulk import MetadataBulkDialog
from calibre.gui2.dialogs.confirm_delete import confirm
from calibre.gui2.dialogs.tag_list_editor import TagListEditor
from calibre.gui2.actions import InterfaceAction

class EditMetadataAction(InterfaceAction):

    name = 'Edit Metadata'
    action_spec = (_('Edit metadata'), 'edit_input.png', None, _('E'))
    action_type = 'current'

    def genesis(self):
        self.create_action(spec=(_('Merge book records'), 'merge_books.png',
            None, _('M')), attr='action_merge')
        md = QMenu()
        md.addAction(_('Edit metadata individually'),
                partial(self.edit_metadata, False, bulk=False))
        md.addSeparator()
        md.addAction(_('Edit metadata in bulk'),
                partial(self.edit_metadata, False, bulk=True))
        md.addSeparator()
        md.addAction(_('Download metadata and covers'),
                partial(self.download_metadata, False, covers=True),
                Qt.ControlModifier+Qt.Key_D)
        md.addAction(_('Download only metadata'),
                partial(self.download_metadata, False, covers=False))
        md.addAction(_('Download only covers'),
                partial(self.download_metadata, False, covers=True,
                    set_metadata=False, set_social_metadata=False))
        md.addAction(_('Download only social metadata'),
                partial(self.download_metadata, False, covers=False,
                    set_metadata=False, set_social_metadata=True))
        self.metadata_menu = md

        mb = QMenu()
        mb.addAction(_('Merge into first selected book - delete others'),
                self.merge_books)
        mb.addSeparator()
        mb.addAction(_('Merge into first selected book - keep others'),
                partial(self.merge_books, safe_merge=True),
                Qt.AltModifier+Qt.Key_M)
        self.merge_menu = mb
        self.action_merge.setMenu(mb)
        md.addSeparator()
        md.addAction(self.action_merge)

        self.qaction.triggered.connect(self.edit_metadata)
        self.qaction.setMenu(md)
        self.action_merge.triggered.connect(self.merge_books)

    def location_selected(self, loc):
        enabled = loc == 'library'
        self.qaction.setEnabled(enabled)
        self.action_merge.setEnabled(enabled)

    def download_metadata(self, checked, covers=True, set_metadata=True,
            set_social_metadata=None):
        rows = self.gui.library_view.selectionModel().selectedRows()
        if not rows or len(rows) == 0:
            d = error_dialog(self.gui, _('Cannot download metadata'),
                             _('No books selected'))
            d.exec_()
            return
        db = self.gui.library_view.model().db
        ids = [db.id(row.row()) for row in rows]
        self.do_download_metadata(ids, covers=covers,
                set_metadata=set_metadata,
                set_social_metadata=set_social_metadata)

    def do_download_metadata(self, ids, covers=True, set_metadata=True,
            set_social_metadata=None):
        m = self.gui.library_view.model()
        db = m.db
        if set_social_metadata is None:
            get_social_metadata = config['get_social_metadata']
        else:
            get_social_metadata = set_social_metadata
        from calibre.gui2.metadata import DoDownload
        if set_social_metadata is not None and set_social_metadata:
            x = _('social metadata')
        else:
            x = _('covers') if covers and not set_metadata else _('metadata')
        title = _('Downloading %s for %d book(s)')%(x, len(ids))
        self._download_book_metadata = DoDownload(self.gui, title, db, ids,
                get_covers=covers, set_metadata=set_metadata,
                get_social_metadata=get_social_metadata)
        m.stop_metadata_backup()
        try:
            self._download_book_metadata.exec_()
        finally:
            m.start_metadata_backup()
        cr = self.gui.library_view.currentIndex().row()
        x = self._download_book_metadata
        if x.updated:
            self.gui.library_view.model().refresh_ids(
                x.updated, cr)
            if self.gui.cover_flow:
                self.gui.cover_flow.dataChanged()

    def edit_metadata(self, checked, bulk=None):
        '''
        Edit metadata of selected books in library.
        '''
        rows = self.gui.library_view.selectionModel().selectedRows()
        previous = self.gui.library_view.currentIndex()
        if not rows or len(rows) == 0:
            d = error_dialog(self.gui, _('Cannot edit metadata'),
                             _('No books selected'))
            d.exec_()
            return

        if bulk or (bulk is None and len(rows) > 1):
            return self.edit_bulk_metadata(checked)

        def accepted(id):
            self.gui.library_view.model().refresh_ids([id])

        for row in rows:
            self.gui.iactions['View'].metadata_view_id = self.gui.library_view.model().db.id(row.row())
            d = MetadataSingleDialog(self.gui, row.row(),
                                    self.gui.library_view.model().db,
                                    accepted_callback=accepted,
                                    cancel_all=rows.index(row) < len(rows)-1)
            d.view_format.connect(self.gui.iactions['View'].metadata_view_format)
            d.exec_()
            if d.cancel_all:
                break
        if rows:
            current = self.gui.library_view.currentIndex()
            m = self.gui.library_view.model()
            if self.gui.cover_flow:
                self.gui.cover_flow.dataChanged()
            m.current_changed(current, previous)
            self.gui.tags_view.recount()

    def edit_bulk_metadata(self, checked):
        '''
        Edit metadata of selected books in library in bulk.
        '''
        rows = [r.row() for r in \
                self.gui.library_view.selectionModel().selectedRows()]
        m = self.gui.library_view.model()
        ids = [m.id(r) for r in rows]
        if not rows or len(rows) == 0:
            d = error_dialog(self.gui, _('Cannot edit metadata'),
                    _('No books selected'))
            d.exec_()
            return
        # Prevent the TagView from updating due to signals from the database
        self.gui.tags_view.blockSignals(True)
        try:
            changed = MetadataBulkDialog(self.gui, rows,
                self.gui.library_view.model()).changed
        finally:
            self.gui.tags_view.blockSignals(False)
        if changed:
            m = self.gui.library_view.model()
            m.resort(reset=False)
            m.research()
            self.gui.tags_view.recount()
            if self.gui.cover_flow:
                self.gui.cover_flow.dataChanged()
            self.gui.library_view.select_rows(ids)

    # Merge books {{{
    def merge_books(self, safe_merge=False):
        '''
        Merge selected books in library.
        '''
        if self.gui.stack.currentIndex() != 0:
            return
        rows = self.gui.library_view.selectionModel().selectedRows()
        if not rows or len(rows) == 0:
            return error_dialog(self.gui, _('Cannot merge books'),
                                _('No books selected'), show=True)
        if len(rows) < 2:
            return error_dialog(self.gui, _('Cannot merge books'),
                        _('At least two books must be selected for merging'),
                        show=True)
        dest_id, src_books, src_ids = self.books_to_merge(rows)
        if safe_merge:
            if not confirm('<p>'+_(
                'Book formats and metadata from the selected books '
                'will be added to the <b>first selected book.</b> '
                'ISBN will <i>not</i> be merged.<br><br> '
                'The second and subsequently selected books will not '
                'be deleted or changed.<br><br>'
                'Please confirm you want to proceed.')
            +'</p>', 'merge_books_safe', self.gui):
                return
            self.add_formats(dest_id, src_books)
            self.merge_metadata(dest_id, src_ids)
        else:
            if not confirm('<p>'+_(
                'Book formats and metadata from the selected books will be merged '
                'into the <b>first selected book</b>. '
                'ISBN will <i>not</i> be merged.<br><br>'
                'After merger the second and '
                'subsequently selected books will be <b>deleted</b>. <br><br>'
                'All book formats of the first selected book will be kept '
                'and any duplicate formats in the second and subsequently selected books '
                'will be permanently <b>deleted</b> from your computer.<br><br>  '
                'Are you <b>sure</b> you want to proceed?')
            +'</p>', 'merge_books', self.gui):
                return
            if len(rows)>5:
                if not confirm('<p>'+_('You are about to merge more than 5 books.  '
                                        'Are you <b>sure</b> you want to proceed?')
                                    +'</p>', 'merge_too_many_books', self.gui):
                    return
            self.add_formats(dest_id, src_books)
            self.merge_metadata(dest_id, src_ids)
            self.delete_books_after_merge(src_ids)
            # leave the selection highlight on first selected book
            dest_row = rows[0].row()
            for row in rows:
                if row.row() < rows[0].row():
                    dest_row -= 1
            ci = self.gui.library_view.model().index(dest_row, 0)
            if ci.isValid():
                self.gui.library_view.setCurrentIndex(ci)

    def add_formats(self, dest_id, src_books, replace=False):
        for src_book in src_books:
            if src_book:
                fmt = os.path.splitext(src_book)[-1].replace('.', '').upper()
                with open(src_book, 'rb') as f:
                    self.gui.library_view.model().db.add_format(dest_id, fmt, f, index_is_id=True,
                            notify=False, replace=replace)

    def books_to_merge(self, rows):
        src_books = []
        src_ids = []
        m = self.gui.library_view.model()
        for i, row in enumerate(rows):
            id_ = m.id(row)
            if i == 0:
                dest_id = id_
            else:
                src_ids.append(id_)
                dbfmts = m.db.formats(id_, index_is_id=True)
                if dbfmts:
                    for fmt in dbfmts.split(','):
                        src_books.append(m.db.format_abspath(id_, fmt,
                            index_is_id=True))
        return [dest_id, src_books, src_ids]

    def delete_books_after_merge(self, ids_to_delete):
        self.gui.library_view.model().delete_books_by_id(ids_to_delete)

    def merge_metadata(self, dest_id, src_ids):
        db = self.gui.library_view.model().db
        dest_mi = db.get_metadata(dest_id, index_is_id=True, get_cover=True)
        orig_dest_comments = dest_mi.comments
        for src_id in src_ids:
            src_mi = db.get_metadata(src_id, index_is_id=True, get_cover=True)
            if src_mi.comments and orig_dest_comments != src_mi.comments:
                if not dest_mi.comments:
                    dest_mi.comments = src_mi.comments
                else:
                    dest_mi.comments = unicode(dest_mi.comments) + u'\n\n' + unicode(src_mi.comments)
            if src_mi.title and (not dest_mi.title or
                    dest_mi.title == _('Unknown')):
                dest_mi.title = src_mi.title
            if src_mi.title and (not dest_mi.authors or dest_mi.authors[0] ==
                    _('Unknown')):
                dest_mi.authors = src_mi.authors
                dest_mi.author_sort = src_mi.author_sort
            if src_mi.tags:
                if not dest_mi.tags:
                    dest_mi.tags = src_mi.tags
                else:
                    dest_mi.tags.extend(src_mi.tags)
            if src_mi.cover and not dest_mi.cover:
                dest_mi.cover = src_mi.cover
            if not dest_mi.publisher:
                dest_mi.publisher = src_mi.publisher
            if not dest_mi.rating:
                dest_mi.rating = src_mi.rating
            if not dest_mi.series:
                dest_mi.series = src_mi.series
                dest_mi.series_index = src_mi.series_index
        db.set_metadata(dest_id, dest_mi, ignore_errors=False)

        for key in db.field_metadata: #loop thru all defined fields
          if db.field_metadata[key]['is_custom']:
            colnum = db.field_metadata[key]['colnum']
            # Get orig_dest_comments before it gets changed
            if db.field_metadata[key]['datatype'] == 'comments':
              orig_dest_value = db.get_custom(dest_id, num=colnum, index_is_id=True)
            for src_id in src_ids:
              dest_value = db.get_custom(dest_id, num=colnum, index_is_id=True)
              src_value = db.get_custom(src_id, num=colnum, index_is_id=True)
              if db.field_metadata[key]['datatype'] == 'comments':
                if src_value and src_value != orig_dest_value:
                  if not dest_value:
                    db.set_custom(dest_id, src_value, num=colnum)
                  else:
                    dest_value = unicode(dest_value) + u'\n\n' + unicode(src_value)
                    db.set_custom(dest_id, dest_value, num=colnum)
              if db.field_metadata[key]['datatype'] in \
                ('bool', 'int', 'float', 'rating', 'datetime') \
                and not dest_value:
                db.set_custom(dest_id, src_value, num=colnum)
              if db.field_metadata[key]['datatype'] == 'series' \
                and not dest_value:
                if src_value:
                  src_index = db.get_custom_extra(src_id, num=colnum, index_is_id=True)
                  db.set_custom(dest_id, src_value, num=colnum, extra=src_index)
              if db.field_metadata[key]['datatype'] == 'text' \
                and not db.field_metadata[key]['is_multiple'] \
                and not dest_value:
                db.set_custom(dest_id, src_value, num=colnum)
              if db.field_metadata[key]['datatype'] == 'text' \
                and db.field_metadata[key]['is_multiple']:
                if src_value:
                  if not dest_value:
                    dest_value = src_value
                  else:
                    dest_value.extend(src_value)
                  db.set_custom(dest_id, dest_value, num=colnum)
        # }}}

    def edit_device_collections(self, view, oncard=None):
        model = view.model()
        result = model.get_collections_with_ids()
        compare = (lambda x,y:cmp(x.lower(), y.lower()))
        d = TagListEditor(self.gui, tag_to_match=None, data=result, compare=compare)
        d.exec_()
        if d.result() == d.Accepted:
            to_rename = d.to_rename # dict of new text to old ids
            to_delete = d.to_delete # list of ids
            for text in to_rename:
                for old_id in to_rename[text]:
                    model.rename_collection(old_id, new_name=unicode(text))
            for item in to_delete:
                model.delete_collection_using_id(item)
            self.gui.upload_collections(model.db, view=view, oncard=oncard)
            view.reset()


