#!/usr/bin/env python
import os
import signal
import subprocess
import sys
import webbrowser

import win32api
import win32con
import win32gui_struct

try:
    import winxpgui as win32gui
except ImportError:
    import win32gui

import install

class OMLTrayIcon(object):
    QUIT = 'QUIT'
    SPECIAL_ACTIONS = [QUIT]

    FIRST_ID = 1023

    def __init__(self):
        launch()
        name = "Open Media Library"
        self.icon = "ico/oml.ico"
        self.hover_text = name
        self.on_quit = quit

        menu_options = (
            ('Launch', None, launch),
            ('Quit', None, self.QUIT)
        )
        self._next_action_id = self.FIRST_ID
        self.menu_actions_by_id = set()
        self.menu_options = self._add_ids_to_menu_options(list(menu_options))
        self.menu_actions_by_id = dict(self.menu_actions_by_id)
        del self._next_action_id

        self.default_menu_index = 0
        self.window_class_name = name

        message_map = {win32gui.RegisterWindowMessage("TaskbarCreated"): self.restart,
                       win32con.WM_DESTROY: self.destroy,
                       win32con.WM_COMMAND: self.command,
                       win32con.WM_USER+20 : self.notify,}
        # Register the Window class.
        window_class = win32gui.WNDCLASS()
        hinst = window_class.hInstance = win32gui.GetModuleHandle(None)
        window_class.lpszClassName = self.window_class_name
        window_class.style = win32con.CS_VREDRAW | win32con.CS_HREDRAW;
        window_class.hCursor = win32gui.LoadCursor(0, win32con.IDC_ARROW)
        window_class.hbrBackground = win32con.COLOR_WINDOW
        window_class.lpfnWndProc = message_map # could also specify a wndproc.
        classAtom = win32gui.RegisterClass(window_class)
        # Create the Window.
        style = win32con.WS_OVERLAPPED | win32con.WS_SYSMENU
        self.hwnd = win32gui.CreateWindow(classAtom,
                                          self.window_class_name,
                                          style,
                                          0,
                                          0,
                                          win32con.CW_USEDEFAULT,
                                          win32con.CW_USEDEFAULT,
                                          0,
                                          0,
                                          hinst,
                                          None)
        win32gui.UpdateWindow(self.hwnd)
        self.notify_id = None
        self.refresh_icon()
        win32gui.PumpMessages()

    def _add_ids_to_menu_options(self, menu_options):
        result = []
        for menu_option in menu_options:
            option_text, option_icon, option_action = menu_option
            if callable(option_action) or option_action in self.SPECIAL_ACTIONS:
                self.menu_actions_by_id.add((self._next_action_id, option_action))
                result.append(menu_option + (self._next_action_id,))
            else:
                print ('Unknown item', option_text, option_icon, option_action)
            self._next_action_id += 1
        return result

    def refresh_icon(self):
        # Try and find a custom icon
        hinst = win32gui.GetModuleHandle(None)
        if os.path.isfile(self.icon):
            icon_flags = win32con.LR_LOADFROMFILE | win32con.LR_DEFAULTSIZE
            hicon = win32gui.LoadImage(hinst,
                                       self.icon,
                                       win32con.IMAGE_ICON,
                                       0,
                                       0,
                                       icon_flags)
        else:
            print ("Can't find icon file - using default.")
            hicon = win32gui.LoadIcon(0, win32con.IDI_APPLICATION)

        if self.notify_id: message = win32gui.NIM_MODIFY
        else: message = win32gui.NIM_ADD
        self.notify_id = (self.hwnd,
                          0,
                          win32gui.NIF_ICON | win32gui.NIF_MESSAGE | win32gui.NIF_TIP,
                          win32con.WM_USER+20,
                          hicon,
                          self.hover_text)
        win32gui.Shell_NotifyIcon(message, self.notify_id)

    def restart(self, hwnd, msg, wparam, lparam):
        self.refresh_icon()

    def destroy(self, hwnd, msg, wparam, lparam):
        if self.on_quit: self.on_quit(self)
        nid = (self.hwnd, 0)
        win32gui.Shell_NotifyIcon(win32gui.NIM_DELETE, nid)
        win32gui.PostQuitMessage(0) # Terminate the app.

    def notify(self, hwnd, msg, wparam, lparam):
        if lparam==win32con.WM_LBUTTONDBLCLK:
            self.execute_menu_option(self.default_menu_index + self.FIRST_ID)
        elif lparam==win32con.WM_RBUTTONUP:
            self.show_menu()
        elif lparam==win32con.WM_LBUTTONUP:
            self.show_menu()
        return True

    def show_menu(self):
        menu = win32gui.CreatePopupMenu()
        self.create_menu(menu, self.menu_options)
        #win32gui.SetMenuDefaultItem(menu, 1000, 0)

        pos = win32gui.GetCursorPos()
        # See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/menus_0hdi.asp
        win32gui.SetForegroundWindow(self.hwnd)
        win32gui.TrackPopupMenu(menu,
                                win32con.TPM_LEFTALIGN,
                                pos[0],
                                pos[1],
                                0,
                                self.hwnd,
                                None)
        win32gui.PostMessage(self.hwnd, win32con.WM_NULL, 0, 0)

    def create_menu(self, menu, menu_options):
        for option_text, option_icon, option_action, option_id in menu_options[::-1]:
            if option_icon:
                option_icon = self.prep_menu_icon(option_icon)

            if option_id in self.menu_actions_by_id:
                item, extras = win32gui_struct.PackMENUITEMINFO(text=option_text,
                                                                hbmpItem=option_icon,
                                                                wID=option_id)
                win32gui.InsertMenuItem(menu, 0, 1, item)
            else:
                submenu = win32gui.CreatePopupMenu()
                self.create_menu(submenu, option_action)
                item, extras = win32gui_struct.PackMENUITEMINFO(text=option_text,
                                                                hbmpItem=option_icon,
                                                                hSubMenu=submenu)
                win32gui.InsertMenuItem(menu, 0, 1, item)

    def prep_menu_icon(self, icon):
        # First load the icon.
        ico_x = win32api.GetSystemMetrics(win32con.SM_CXSMICON)
        ico_y = win32api.GetSystemMetrics(win32con.SM_CYSMICON)
        hicon = win32gui.LoadImage(0, icon, win32con.IMAGE_ICON, ico_x, ico_y, win32con.LR_LOADFROMFILE)

        hdcBitmap = win32gui.CreateCompatibleDC(0)
        hdcScreen = win32gui.GetDC(0)
        hbm = win32gui.CreateCompatibleBitmap(hdcScreen, ico_x, ico_y)
        hbmOld = win32gui.SelectObject(hdcBitmap, hbm)
        # Fill the background.
        brush = win32gui.GetSysColorBrush(win32con.COLOR_MENU)
        win32gui.FillRect(hdcBitmap, (0, 0, 16, 16), brush)
        # unclear if brush needs to be feed.  Best clue I can find is:
        # "GetSysColorBrush returns a cached brush instead of allocating a new
        # one." - implies no DeleteObject
        # draw the icon
        win32gui.DrawIconEx(hdcBitmap, 0, 0, hicon, ico_x, ico_y, 0, 0, win32con.DI_NORMAL)
        win32gui.SelectObject(hdcBitmap, hbmOld)
        win32gui.DeleteDC(hdcBitmap)

        return hbm

    def command(self, hwnd, msg, wparam, lparam):
        id = win32gui.LOWORD(wparam)
        self.execute_menu_option(id)

    def execute_menu_option(self, id):
        menu_action = self.menu_actions_by_id[id]
        if menu_action == self.QUIT:
            win32gui.DestroyWindow(self.hwnd)
        else:
            menu_action(self)

def check_pid(pid):
    try:
        with open(pid) as fd:
            pid = int(fd.read())
    except:
        return False
    try:
        os.kill(pid, 0)
    except:
        return False
    else:
        return True

def launch(sysTrayIcon=None):
    base = os.path.join(os.getenv('LOCALAPPDATA'), 'Open Media Library')
    pid = os.path.join(base, 'data', 'openmedialibrary.pid')
    if os.path.exists(pid) and check_pid(pid):
        webbrowser.open_new_tab(os.path.join(base, 'openmedialibrary', 'static', 'html', 'load.html'))
    elif os.path.exists(base):
        python = os.path.join(base, 'platform_win32', 'pythonw.exe')
        oml = os.path.join(base, 'openmedialibrary')
        subprocess.Popen([python, 'oml', 'server', pid], cwd=oml, start_new_session=True)
        webbrowser.open_new_tab(os.path.join(base, 'openmedialibrary', 'static', 'html', 'load.html'))
    else:
        install.run(base)

def quit(sysTrayIcon):
    base = os.path.join(os.getenv('LOCALAPPDATA'), 'Open Media Library')
    pid = os.path.join(base, 'data', 'openmedialibrary.pid')
    if os.path.exists(pid):
        with open(pid) as fd:
            data = fd.read().strip()
        try:
            os.kill(int(data), signal.SIGTERM)
        except:
            pass

if __name__ == '__main__':
    if getattr(sys, 'frozen', False):
        base = os.path.dirname(sys.executable)
    else:
        base = os.path.dirname(os.path.realpath(__file__))
    base = os.path.abspath(base)
    os.chdir(base)
    OMLTrayIcon()
