import sys
import tkinter as tk
import webbrowser
from tkinter import font as tkFont
from tkinter import ttk

if sys.platform == 'win32':
    import subprocess
    from winreg import HKEY_CLASSES_ROOT, HKEY_CURRENT_USER, CloseKey, OpenKeyEx, QueryValueEx

# A clickable ttk Label
#
# In addition to standard ttk.Label arguments, takes the following arguments:
#   url: The URL as a string that the user will be sent to on clicking on non-empty label text. If url is a function it will be called on click with the current label text and should return the URL as a string.
#   underline: If True/False the text is always/never underlined. If None (the default) the text is underlined only on hover.
#   popup_copy: Whether right-click on non-empty label text pops up a context menu with a 'Copy' option. Defaults to no context menu. If popup_copy is a function it will be called with the current label text and should return a boolean.
#
# May be imported by plugins


class HyperlinkLabel(sys.platform == 'darwin' and tk.Label or ttk.Label, object):

    def __init__(self, master=None, **kw):
        self.url = 'url' in kw and kw.pop('url') or None
        self.popup_copy = kw.pop('popup_copy', False)
        self.underline = kw.pop('underline', None)  # override ttk.Label's underline
        self.foreground = kw.get('foreground') or 'blue'
        self.disabledforeground = kw.pop('disabledforeground', ttk.Style().lookup(
            'TLabel', 'foreground', ('disabled',)))  # ttk.Label doesn't support disabledforeground option

        if sys.platform == 'darwin':
            # Use tk.Label 'cos can't set ttk.Label background - http://www.tkdocs.com/tutorial/styles.html#whydifficult
            kw['background'] = kw.pop('background', 'systemDialogBackgroundActive')
            kw['anchor'] = kw.pop('anchor', tk.W)  # like ttk.Label
            tk.Label.__init__(self, master, **kw)
        else:
            ttk.Label.__init__(self, master, **kw)

        self.bind('<Button-1>', self._click)

        self.menu = tk.Menu(None, tearoff=tk.FALSE)
        # LANG: Label for 'Copy' as in 'Copy and Paste'
        self.menu.add_command(label=_('Copy'), command=self.copy)  # As in Copy and Paste
        self.bind(sys.platform == 'darwin' and '<Button-2>' or '<Button-3>', self._contextmenu)

        self.bind('<Enter>', self._enter)
        self.bind('<Leave>', self._leave)

        # set up initial appearance
        self.configure(state=kw.get('state', tk.NORMAL),
                       text=kw.get('text'),
                       font=kw.get('font', ttk.Style().lookup('TLabel', 'font')))

    # Change cursor and appearance depending on state and text
    def configure(self, cnf=None, **kw):
        # This class' state
        for thing in ['url', 'popup_copy', 'underline']:
            if thing in kw:
                setattr(self, thing, kw.pop(thing))
        for thing in ['foreground', 'disabledforeground']:
            if thing in kw:
                setattr(self, thing, kw[thing])

        # Emulate disabledforeground option for ttk.Label
        if kw.get('state') == tk.DISABLED:
            if 'foreground' not in kw:
                kw['foreground'] = self.disabledforeground
        elif 'state' in kw:
            if 'foreground' not in kw:
                kw['foreground'] = self.foreground

        if 'font' in kw:
            self.font_n = kw['font']
            self.font_u = tkFont.Font(font=self.font_n)
            self.font_u.configure(underline=True)
            kw['font'] = self.underline is True and self.font_u or self.font_n

        if 'cursor' not in kw:
            if (kw['state'] if 'state' in kw else str(self['state'])) == tk.DISABLED:
                kw['cursor'] = 'arrow'  # System default
            elif self.url and (kw['text'] if 'text' in kw else self['text']):
                kw['cursor'] = sys.platform == 'darwin' and 'pointinghand' or 'hand2'
            else:
                kw['cursor'] = (sys.platform == 'darwin' and 'notallowed') or (
                    sys.platform == 'win32' and 'no') or 'circle'

        super(HyperlinkLabel, self).configure(cnf, **kw)

    def __setitem__(self, key, value):
        self.configure(None, **{key: value})

    def _enter(self, event):
        if self.url and self.underline is not False and str(self['state']) != tk.DISABLED:
            super(HyperlinkLabel, self).configure(font=self.font_u)

    def _leave(self, event):
        if not self.underline:
            super(HyperlinkLabel, self).configure(font=self.font_n)

    def _click(self, event):
        if self.url and self['text'] and str(self['state']) != tk.DISABLED:
            url = self.url(self['text']) if callable(self.url) else self.url
            if url:
                self._leave(event)  # Remove underline before we change window to browser
                openurl(url)

    def _contextmenu(self, event):
        if self['text'] and (self.popup_copy(self['text']) if callable(self.popup_copy) else self.popup_copy):
            self.menu.post(sys.platform == 'darwin' and event.x_root + 1 or event.x_root, event.y_root)

    def copy(self):
        self.clipboard_clear()
        self.clipboard_append(self['text'])


def openurl(url):
    if sys.platform == 'win32':
        # On Windows webbrowser.open calls os.startfile which calls ShellExecute which can't handle long arguments,
        # so discover and launch the browser directly.
        # https://blogs.msdn.microsoft.com/oldnewthing/20031210-00/?p=41553

        try:
            hkey = OpenKeyEx(HKEY_CURRENT_USER,
                             r'Software\Microsoft\Windows\Shell\Associations\UrlAssociations\https\UserChoice')
            (value, typ) = QueryValueEx(hkey, 'ProgId')
            CloseKey(hkey)
            if value in ['IE.HTTP', 'AppXq0fevzme2pys62n3e0fbqa7peapykr8v']:
                # IE and Edge can't handle long arguments so just use webbrowser.open and hope
                # https://blogs.msdn.microsoft.com/ieinternals/2014/08/13/url-length-limits/
                cls = None
            else:
                cls = value
        except:
            cls = 'https'

        if cls:
            try:
                hkey = OpenKeyEx(HKEY_CLASSES_ROOT, r'%s\shell\open\command' % cls)
                (value, typ) = QueryValueEx(hkey, None)
                CloseKey(hkey)
                if 'iexplore' not in value.lower():
                    if '%1' in value:
                        subprocess.Popen(buf.value.replace('%1', url))
                    else:
                        subprocess.Popen('%s "%s"' % (buf.value, url))
                    return
            except:
                pass

    webbrowser.open(url)
