# vim:fileencoding=utf-8
# License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
from __python__ import bound_methods, hash_literals

import traceback
from elementmaker import E
from gettext import gettext as _, install

import initialize  # noqa: unused-import
from ajax import ajax, workaround_qt_bug
from book_list.globals import get_session_data, set_session_data
from book_list.library_data import library_data
from book_list.theme import get_color, css_for_variables
from dom import get_widget_css, set_css
from modals import create_modal_container
from qt import from_python, to_python
from read_book.db import new_book
from read_book.footnotes import main as footnotes_main
from read_book.globals import runtime, set_system_colors, ui_operations, default_color_schemes
from read_book.iframe import main as iframe_main
from read_book.shortcuts import add_standalone_viewer_shortcuts
from read_book.view import View
from session import local_storage, session_defaults
from utils import debounce, encode_query_with_path, parse_url_params
from viewer.constants import FAKE_HOST, FAKE_PROTOCOL, READER_BACKGROUND_URL

runtime.is_standalone_viewer = True
runtime.FAKE_HOST = FAKE_HOST
runtime.SANDBOX_HOST = FAKE_HOST.rpartition('.')[0] + '.sandbox'
runtime.FAKE_PROTOCOL = FAKE_PROTOCOL
book = None
view = None


def file_received(name, file_data, proceed, end_type, xhr, ev):
    end_type = workaround_qt_bug(xhr, end_type)
    if end_type is 'abort':
        return
    if end_type is not 'load':
        show_error(_('Failed to load file from book'), _(
            'Could not load the file: {} with error: {}').format(name, xhr.error_html))
        return
    if not xhr.responseType or xhr.responseType is 'text':
        result = xhr.responseText
    else if xhr.responseType is 'blob':
        result = xhr.response
    else:
        show_error(_('Failed to load file from book'), _(
            'Could not load the file: {} unknown response type: {}').format(name, xhr.responseType))
        return

    proceed(result, name, file_data.mimetype, book)


def get_file(book, name, proceed):
    entry = book.manifest.files[name]
    if not entry:
        raise ValueError(f'No file named {name} in the book manifest')
    xhr = ajax('book/' + name, file_received.bind(None, name, entry, proceed), ok_code=0)
    if entry.is_html or entry.mimetype.startswith('text/') or entry.mimetype is 'application/javascript':
        xhr.responseType = 'text'
    else:
        xhr.responseType = 'blob'
    xhr.send()


def get_mathjax_files(proceed):
    proceed({})


def update_url_state(replace):
    if view and view.currently_showing:
        bookpos = view.currently_showing.bookpos
        if bookpos:
            query = {'bookpos': bookpos}
            query = encode_query_with_path(query)
            if replace:
                window.history.replaceState(None, '', query)
            else:
                window.history.pushState(None, '', query)


def on_pop_state():
    if view and view.currently_showing:
        data = parse_url_params()
        if data.bookpos and data.bookpos.startswith('epubcfi(/'):
            view.goto_cfi(data.bookpos)


def show_error(title, msg, details):
    to_python.show_error(title, msg, details)


def manifest_received(key, initial_position, pathtoebook, highlights, end_type, xhr, ev):
    nonlocal book
    end_type = workaround_qt_bug(xhr, end_type)
    if end_type is 'load':
        book = new_book(key, {})
        data = xhr.response
        book.manifest = data[0]
        book.metadata = book.manifest.metadata = data[1]
        book.manifest.pathtoebook = pathtoebook
        book.highlights = highlights
        book.stored_files = {}
        book.is_complete = True
        v'delete book.manifest["metadata"]'
        v'delete book.manifest["last_read_positions"]'
        view.display_book(book, initial_position)
    else:
        show_error(_('Could not open book'), _(
            'Failed to load book manifest, click "Show details" for more info'),
        xhr.error_html or None)


class SessionData:

    def __init__(self, prefs):
        defaults = session_defaults()
        self.data = {k: defaults[k] if prefs[k] is undefined else prefs[k] for k in defaults}

    def get(self, key, defval):
        ans = self.data[key]
        if ans is undefined or ans is None:
            if defval is undefined:
                defval = None
            return defval
        return ans

    def set(self, key, val):
        if val is None:
            self.data[key] = session_defaults()[key]
        else:
            self.data[key] = val
        to_python.set_session_data(key, val)

    def clear(self):
        defaults = session_defaults()
        self.data = {k: defaults[k] for k in defaults}
        to_python.set_session_data('*', None)


class LocalStorage:

    def __init__(self, data):
        self.data = data

    def get(self, key, defval):
        ans = self.data[key]
        if ans is undefined or ans is None:
            if defval is undefined:
                defval = None
            return defval
        return ans

    def set(self, key, val):
        self.data[key] = val
        to_python.set_local_storage(key, val)

    def clear(self):
        self.data = {}
        to_python.set_local_storage('*', None)


def create_session_data(prefs, local_storage_data):
    sd = SessionData(prefs)
    set_session_data(sd)
    local_storage.storage = LocalStorage(local_storage_data)


@from_python
def create_view(prefs, local_storage, field_metadata, ui_data):
    nonlocal view
    set_system_colors(ui_data.system_colors)
    runtime.all_font_families = ui_data.all_font_families
    library_data.field_metadata = field_metadata
    document.documentElement.style.fontFamily = f'"{ui_data.ui_font_family}", sans-serif'
    document.documentElement.style.fontSize = ui_data.ui_font_sz
    runtime.QT_VERSION = ui_data.QT_VERSION
    if view is None:
        create_session_data(prefs, local_storage)
        view = View(document.getElementById('view'))
        window.addEventListener('resize', debounce(view.on_resize.bind(self), 250))
        to_python.view_created({'default_color_schemes': default_color_schemes})
        if ui_data.show_home_page_on_ready:
            view.overlay.open_book(False)


@from_python
def set_system_palette(system_colors):
    set_system_colors(system_colors)
    if view:
        view.update_color_scheme()


@from_python
def highlight_action(uuid, which):
    if view:
        view.highlight_action(uuid, which)


@from_python
def generic_action(which, data):
    if which is 'set-notes-in-highlight':
        view.set_notes_for_highlight(data.uuid, data.notes or '')


@from_python
def show_home_page():
    view.overlay.open_book(False)


@from_python
def start_book_load(key, initial_position, pathtoebook, highlights):
    xhr = ajax('manifest', manifest_received.bind(None, key, initial_position, pathtoebook, highlights), ok_code=0)
    xhr.responseType = 'json'
    xhr.send()


@from_python
def goto_toc_node(node_id):
    view.goto_toc_node(node_id)


@from_python
def goto_cfi(cfi):
    view.goto_cfi(cfi)


@from_python
def full_screen_state_changed(viewer_in_full_screen):
    runtime.viewer_in_full_screen = viewer_in_full_screen


@from_python
def get_current_cfi(request_id):
    view.get_current_cfi(request_id, ui_operations.report_cfi)


@from_python
def goto_frac(frac):
    if view:
        view.goto_frac(frac)


@from_python
def background_image_changed(img_id):
    img = document.getElementById(img_id)
    if img:
        img.src = READER_BACKGROUND_URL + '?' + Date().getTime()


@from_python
def trigger_shortcut(which):
    if view:
        view.on_handle_shortcut({'name': which})


@from_python
def show_search_result(sr):
    if view:
        view.show_search_result(sr)

@from_python
def prepare_for_close():
    if view:
        view.prepare_for_close()
    else:
        ui_operations.close_prep_finished(None)


@from_python
def viewer_font_size_changed():
    if view:
        view.viewer_font_size_changed()


def onerror(msg, script_url, line_number, column_number, error_object):
    if not error_object:
        # cross domain error
        return False
    fname = script_url.rpartition('/')[-1] or script_url
    msg += '<br><span style="font-size:smaller">' + 'Error at {}:{}:{}'.format(fname, line_number, column_number or '') + '</span>'
    details = ''
    console.log(error_object)
    details = traceback.format_exception(error_object).join('')
    show_error(_('Unhandled error'), msg, details)
    return True


if window is window.top:
    # main
    TRANSLATIONS_DATA = v'__TRANSLATIONS_DATA__'
    if TRANSLATIONS_DATA:
        install(TRANSLATIONS_DATA)
    add_standalone_viewer_shortcuts()
    ui_operations.get_file = get_file
    ui_operations.get_mathjax_files = get_mathjax_files
    ui_operations.update_url_state = update_url_state
    ui_operations.show_error = show_error
    ui_operations.redisplay_book = def():
        view.redisplay_book()
    ui_operations.reload_book = def():
        to_python.reload_book()
    ui_operations.forward_gesture = def(gesture):
        view.forward_gesture(gesture)
    ui_operations.update_color_scheme = def():
        view.update_color_scheme()
    ui_operations.update_font_size = def():
        view.update_font_size()
    ui_operations.focus_iframe = def():
        view.focus_iframe()
    ui_operations.goto_cfi = def(cfi):
        return view.goto_cfi(cfi)
    ui_operations.goto_frac = def(frac):
        return view.goto_frac(frac)
    ui_operations.goto_book_position = def(bpos):
        return view.goto_book_position(bpos)
    ui_operations.goto_reference = def(ref):
        return view.goto_reference(ref)
    ui_operations.toggle_toc = def():
        to_python.toggle_toc()
    ui_operations.toggle_bookmarks = def():
        to_python.toggle_bookmarks()
    ui_operations.toggle_highlights = def():
        to_python.toggle_highlights()
    ui_operations.new_bookmark = def(request_id, data):
        if request_id is 'new-bookmark':
            to_python.new_bookmark(data)
    ui_operations.toggle_inspector = def():
        to_python.toggle_inspector()
    ui_operations.content_file_changed = def(name):
        to_python.content_file_changed(name)
    ui_operations.show_search = def(text):
        to_python.show_search(text)
    ui_operations.find_next = def(previous):
        to_python.find_next(previous)
    ui_operations.reset_interface = def():
        sd = get_session_data()
        defaults = session_defaults()
        m = sd.get('standalone_misc_settings', {})
        v'delete m.show_actions_toolbar'
        sd.set('standalone_misc_settings', m)
        sd.set('book_scrollbar', False)
        view.book_scrollbar.apply_visibility()
        sd.set('header', defaults.header)
        sd.set('footer', defaults.footer)
        view.update_header_footer()
        to_python.reset_interface()
    ui_operations.open_url = def(url):
        to_python.open_url(url)
    ui_operations.quit = def():
        to_python.quit()
    ui_operations.toggle_lookup = def(force_show):
        to_python.toggle_lookup(v'!!force_show')
    ui_operations.selection_changed = def(selected_text, annot_id):
        to_python.selection_changed(selected_text, annot_id or None)
    ui_operations.update_current_toc_nodes = def(current_node_id, top_level_node_id):
        to_python.update_current_toc_nodes(current_node_id, top_level_node_id)
    ui_operations.toggle_full_screen = def():
        to_python.toggle_full_screen()
    ui_operations.report_cfi = def(request_id, data):
        to_python.report_cfi(request_id, data)
    ui_operations.ask_for_open = def(path):
        to_python.ask_for_open(path)
    ui_operations.copy_selection = def(text):
        to_python.copy_selection(text or None)
    ui_operations.view_image = def(name):
        to_python.view_image(name)
    ui_operations.copy_image = def(name):
        to_python.copy_image(name)
    ui_operations.change_background_image = def(img_id):
        to_python.change_background_image(img_id)
    ui_operations.quit = def():
        to_python.quit()
    ui_operations.overlay_visibility_changed = def(visible):
        to_python.overlay_visibility_changed(visible)
    ui_operations.reference_mode_changed = def(enabled):
        to_python.reference_mode_changed(enabled)
    ui_operations.show_loading_message = def(msg):
        to_python.show_loading_message(msg)
    ui_operations.export_shortcut_map = def(smap):
        to_python.export_shortcut_map(smap)
    ui_operations.print_book = def():
        to_python.print_book()
    ui_operations.clear_history = def():
        to_python.clear_history()
    ui_operations.customize_toolbar = def():
        to_python.customize_toolbar()
    ui_operations.autoscroll_state_changed = def(active):
        to_python.autoscroll_state_changed(active)
    ui_operations.search_result_not_found = def(sr):
        to_python.search_result_not_found(sr)
    ui_operations.scrollbar_context_menu = def(x, y, frac):
        to_python.scrollbar_context_menu(x, y, frac)
    ui_operations.close_prep_finished = def(cfi):
        to_python.close_prep_finished(cfi)
    ui_operations.highlights_changed = def(highlights):
        to_python.highlights_changed(highlights)

    document.body.appendChild(E.div(id='view'))
    window.onerror = onerror
    create_modal_container()
    document.head.appendChild(E.style(css_for_variables() + '\n\n' + get_widget_css()))
    set_css(document.body, background_color=get_color('window-background'), color=get_color('window-foreground'))
    setTimeout(def():
            window.onpopstate = on_pop_state
        , 0)  # We do this after event loop ticks over to avoid catching popstate events that some browsers send on page load
else:
    # iframe
    div = document.getElementById('calibre-viewer-footnote-iframe')
    if div:
        footnotes_main()
    else:
        iframe_main()
    add_standalone_viewer_shortcuts()