# vim:fileencoding=utf-8
# License: GPL v3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
from __python__ import bound_methods, hash_literals

from uuid import short_uuid

from ajax import ajax_send


defaults = {
    # Book list settings
    'copy_to_library_dupes': 'add;overwrite',
    'last_sort_order': {},
    'show_all_metadata': False, # show all metadata fields in the book details panel
    'sort': 'timestamp.desc',  # comma separated list of items of the form: field.order
    'view_mode': 'cover_grid',

    # Tag Browser settings
    'and_search_terms': False,  # how to add search terms to the search expression from the Tag Browser
    'collapse_at': 25,  # number of items at which sub-groups are created, 0 to disable
    'dont_collapse': '',  # comma separated list of category names
    'hide_empty_categories': 'no',
    'partition_method': 'first letter',  # other choices: 'disable', 'partition'
    'sort_tags_by': 'name', # other choices: popularity, rating

    # Book reader settings
    'background_image_fade': 0,
    'background_image_style': 'scaled',
    'background_image': None,
    'base_font_size': 16,
    'book_scrollbar': False,
    'columns_per_screen': {'portrait':0, 'landscape':0},
    'controls_help_shown_count': 0,
    'controls_help_shown_count_rtl_page_progression': 0,
    'cover_preserve_aspect_ratio': True,
    'current_color_scheme': 'system',
    'footer': {'right': 'progress'},
    'header': {},
    'left-margin': {},
    'right-margin': {},
    'hide_tooltips': False,
    'keyboard_shortcuts': {},
    'lines_per_sec_auto': 1,
    'lines_per_sec_smooth': 20,
    'margin_bottom': 20,
    'margin_left': 20,
    'margin_right': 20,
    'margin_top': 20,
    'max_text_height': 0,
    'max_text_width': 0,
    'override_book_colors': 'never',
    'paged_margin_clicks_scroll_by_screen': True,
    'paged_wheel_scrolls_by_screen': False,
    'paged_taps_scroll_by_screen': False,
    'paged_pixel_scroll_threshold': 60,
    'read_mode': 'paged',
    'scroll_auto_boundary_delay': 5,
    'scroll_stop_boundaries': False,
    'standalone_font_settings': {},
    'standalone_misc_settings': {},
    'standalone_recently_opened': v'[]',
    'user_color_schemes': {},
    'user_stylesheet': '',
    'word_actions': v'[]',
    'highlight_style': None,
    'custom_highlight_colors': v'[]',
    'show_selection_bar': True,
    'net_search_url': 'https://google.com/search?q={q}',
    'selection_bar_actions': v"['copy', 'lookup', 'highlight', 'remove_highlight', 'search_net', 'clear']",
}

is_local_setting = {
    'background_image_fade': True,
    'background_image_style': True,
    'background_image': True,
    'base_font_size': True,
    'columns_per_screen': True,
    'controls_help_shown_count': True,
    'controls_help_shown_count_rtl_page_progression': True,
    'current_color_scheme': True,
    'lines_per_sec_auto': True,
    'lines_per_sec_smooth': True,
    'margin_bottom': True,
    'margin_left': True,
    'margin_right': True,
    'margin_top': True,
    'max_text_height': True,
    'max_text_width': True,
    'override_book_colors': True,
    'read_mode': 'paged',
    'scroll_auto_boundary_delay': True,
    'scroll_stop_boundaries': True,
    'standalone_font_settings': True,
    'standalone_misc_settings': True,
    'standalone_recently_opened': True,
    'user_stylesheet': True,
    'highlight_style': True,
}


def session_defaults():
    return defaults


def storage_available(which):
    which = which or 'localStorage'
    try:
        storage = window[which]
        x = '__storage__test__'
        storage.setItem(x, x)
        storage.removeItem(x)
        return True
    except:
        return False

class FakeStorage:

    def __init__(self):
        self.data = {}

    def getItem(self, key):
        return self.data[key]

    def setItem(self, key, value):
        if jstype(value) is not 'string':
            value = JSON.stringify(value)
        self.data[key] = value

    def clear(self):
        self.data = {}

def get_session_storage():
    if not get_session_storage.ans:
        if storage_available('localStorage'):
            get_session_storage.ans = window.localStorage
        elif storage_available('sessionStorage'):
            get_session_storage.ans = window.sessionStorage
            console.error('localStorage not available using sessionStorage instead')
        else:
            get_session_storage.ans = FakeStorage()
            console.error('sessionStorage and localStorage not available using a temp cache instead')
    return get_session_storage.ans

class SessionData:

    def __init__(self, global_prefix=None):
        self.global_prefix = global_prefix or 'calibre-session-'
        self.storage = get_session_storage()
        self.overflow_storage = {}
        self.has_overflow = False

    def get(self, key, defval):
        key = self.global_prefix + key
        if self.has_overflow:
            ans = self.overflow_storage[key]
            if ans is undefined:
                ans = self.storage.getItem(key)
        else:
            ans = self.storage.getItem(key)
        if ans is undefined or ans is None:
            if defval is undefined:
                defval = None
            return defval
        return JSON.parse(ans)

    def set(self, key, value):
        key = self.global_prefix + key
        if value is None:
            self.storage.removeItem(key)
            v'delete self.overflow_storage[key]'
            return True
        value = JSON.stringify(value)
        try:
            self.storage.setItem(key, value)
            v'delete self.overflow_storage[key]'
            return True
        except:
            self.overflow_storage[key] = value
            self.has_overflow = True
            console.error('session storage has overflowed, using a temp cache instead')
        return False

    def clear(self):
        self.storage.clear()
        self.overflow_storage = {}
        self.has_overflow = False


def local_storage():
    if not local_storage.storage:
        local_storage.storage = SessionData('calibre-local-')
    return local_storage.storage


def get_device_uuid():
    if not get_device_uuid.ans:
        s = local_storage()
        ans = s.get('device_uuid')
        if not ans:
            ans = short_uuid()
            s.set('device_uuid', ans)
        get_device_uuid.ans = ans
    return get_device_uuid.ans


default_interface_data = {
    'username': None,
    'output_format': 'EPUB',
    'input_formats': {'EPUB', 'MOBI', 'AZW3'},
    'gui_pubdate_display_format': 'MMM yyyy',
    'gui_timestamp_display_format': 'dd MMM yyyy',
    'gui_last_modified_display_format': 'dd MMM yyyy',
    'use_roman_numerals_for_series_number': True,
    'default_library_id': None,
    'default_book_list_mode': defaults.view_mode,
    'library_map': None,
    'search_the_net_urls': [],
    'donate_link': 'https://calibre-ebook.com/donate',
    'icon_map': {},
    'icon_path': '',
    'custom_list_template': None,
    'num_per_page': 50,
}

def get_interface_data():
    if not get_interface_data.storage:
        get_interface_data.storage = SessionData('calibre-interface-data-')
    ans = get_interface_data.storage.get('current')
    if ans:
        ans.is_default = False
    else:
        ans = {'is_default': True}
        for k in default_interface_data:
            ans[k] = default_interface_data[k]
    return ans


def update_interface_data(new_data):
    data = get_interface_data()
    for k in default_interface_data:
        nval = new_data[k]
        if k is not undefined:
            data[k] = nval
    if not get_interface_data.storage:
        get_interface_data.storage = SessionData('calibre-interface-data-')
    get_interface_data.storage.set('current', data)


def get_translations(newval):
    if not get_translations.storage:
        get_translations.storage = SessionData('calibre-translations-')
    if newval?:
        get_translations.storage.set('current', newval)
    else:
        return get_translations.storage.get('current')


class UserSessionData(SessionData):

    def __init__(self, username, saved_data):
        self.prefix = (username or '') + '-'
        self.has_user = bool(username)
        self.username = username
        SessionData.__init__(self)
        self.echo_changes = False
        self.changes = {}
        self.has_changes = False
        self.push_timer_id = None
        if saved_data:
            for key in saved_data:
                if not is_local_setting[key]:
                    self.set(key, saved_data[key])
        self.echo_changes = True

    def defval(self, key):
        return defaults[key]

    def get(self, key, defval):
        if defval is undefined:
            defval = defaults[key]
        return SessionData.get(self, (self.prefix + key), defval)

    def get_library_option(self, library_id, key, defval):
        if not library_id:
            return self.get(key, defval)
        lkey = key + '-||-' + library_id
        if defval is undefined:
            defval = defaults[key]
        return self.get(lkey, defval)

    def set(self, key, value):
        if self.echo_changes and self.has_user and not is_local_setting[key]:
            self.changes[key] = value
            self.has_changes = True
            if self.push_timer_id is not None:
                clearTimeout(self.push_timer_id)
            self.push_timer_id = setTimeout(self.push_to_server.bind(self), 1000)
        return SessionData.set(self, (self.prefix + key), value)

    def set_library_option(self, library_id, key, value):
        if library_id:
            key = key + '-||-' + library_id
        return self.set(key, value)

    def push_to_server(self):
        if self.has_changes:
            ajax_send('interface-data/set-session-data', self.changes, def(end_type, xhr, ev):
                if end_type is not 'load':
                    console.error('Failed to send session data to server: ' + xhr.error_html)
            )
            self.changes = {}
            self.has_changes = False