import builtins
import keyword
import re
import time

from idlelib.config import idleConf
from idlelib.delegator import Delegator

DEBUG = False

def any(name, alternates):
    "Return a named group pattern matching list of alternates."
    return "(?P<%s>" % name + "|".join(alternates) + ")"

def make_pat():
    kw = r"\b" + any("KEYWORD", keyword.kwlist + ['async', 'await']) + r"\b"
    builtinlist = [str(name) for name in dir(builtins)
                                        if not name.startswith('_') and \
                                        name not in keyword.kwlist]
    builtin = r"([^.'\"\\#]\b|^)" + any("BUILTIN", builtinlist) + r"\b"
    comment = any("COMMENT", [r"#[^\n]*"])
    stringprefix = r"(?i:r|u|f|fr|rf|b|br|rb)?"
    sqstring = stringprefix + r"'[^'\\\n]*(\\.[^'\\\n]*)*'?"
    dqstring = stringprefix + r'"[^"\\\n]*(\\.[^"\\\n]*)*"?'
    sq3string = stringprefix + r"'''[^'\\]*((\\.|'(?!''))[^'\\]*)*(''')?"
    dq3string = stringprefix + r'"""[^"\\]*((\\.|"(?!""))[^"\\]*)*(""")?'
    string = any("STRING", [sq3string, dq3string, sqstring, dqstring])
    return kw + "|" + builtin + "|" + comment + "|" + string +\
           "|" + any("SYNC", [r"\n"])

prog = re.compile(make_pat(), re.S)
idprog = re.compile(r"\s+(\w+)", re.S)

def color_config(text):
    """Set color options of Text widget.

    If ColorDelegator is used, this should be called first.
    """
    # Called from htest, TextFrame, Editor, and Turtledemo.
    # Not automatic because ColorDelegator does not know 'text'.
    theme = idleConf.CurrentTheme()
    normal_colors = idleConf.GetHighlight(theme, 'normal')
    cursor_color = idleConf.GetHighlight(theme, 'cursor', fgBg='fg')
    select_colors = idleConf.GetHighlight(theme, 'hilite')
    text.config(
        foreground=normal_colors['foreground'],
        background=normal_colors['background'],
        insertbackground=cursor_color,
        selectforeground=select_colors['foreground'],
        selectbackground=select_colors['background'],
        inactiveselectbackground=select_colors['background'],  # new in 8.5
    )


class ColorDelegator(Delegator):

    def __init__(self):
        Delegator.__init__(self)
        self.prog = prog
        self.idprog = idprog
        self.LoadTagDefs()

    def setdelegate(self, delegate):
        if self.delegate is not None:
            self.unbind("<<toggle-auto-coloring>>")
        Delegator.setdelegate(self, delegate)
        if delegate is not None:
            self.config_colors()
            self.bind("<<toggle-auto-coloring>>", self.toggle_colorize_event)
            self.notify_range("1.0", "end")
        else:
            # No delegate - stop any colorizing
            self.stop_colorizing = True
            self.allow_colorizing = False

    def config_colors(self):
        for tag, cnf in self.tagdefs.items():
            if cnf:
                self.tag_configure(tag, **cnf)
        self.tag_raise('sel')

    def LoadTagDefs(self):
        theme = idleConf.CurrentTheme()
        self.tagdefs = {
            "COMMENT": idleConf.GetHighlight(theme, "comment"),
            "KEYWORD": idleConf.GetHighlight(theme, "keyword"),
            "BUILTIN": idleConf.GetHighlight(theme, "builtin"),
            "STRING": idleConf.GetHighlight(theme, "string"),
            "DEFINITION": idleConf.GetHighlight(theme, "definition"),
            "SYNC": {'background':None,'foreground':None},
            "TODO": {'background':None,'foreground':None},
            "ERROR": idleConf.GetHighlight(theme, "error"),
            # The following is used by ReplaceDialog:
            "hit": idleConf.GetHighlight(theme, "hit"),
            }

        if DEBUG: print('tagdefs',self.tagdefs)

    def insert(self, index, chars, tags=None):
        index = self.index(index)
        self.delegate.insert(index, chars, tags)
        self.notify_range(index, index + "+%dc" % len(chars))

    def delete(self, index1, index2=None):
        index1 = self.index(index1)
        self.delegate.delete(index1, index2)
        self.notify_range(index1)

    after_id = None
    allow_colorizing = True
    colorizing = False

    def notify_range(self, index1, index2=None):
        self.tag_add("TODO", index1, index2)
        if self.after_id:
            if DEBUG: print("colorizing already scheduled")
            return
        if self.colorizing:
            self.stop_colorizing = True
            if DEBUG: print("stop colorizing")
        if self.allow_colorizing:
            if DEBUG: print("schedule colorizing")
            self.after_id = self.after(1, self.recolorize)

    close_when_done = None # Window to be closed when done colorizing

    def close(self, close_when_done=None):
        if self.after_id:
            after_id = self.after_id
            self.after_id = None
            if DEBUG: print("cancel scheduled recolorizer")
            self.after_cancel(after_id)
        self.allow_colorizing = False
        self.stop_colorizing = True
        if close_when_done:
            if not self.colorizing:
                close_when_done.destroy()
            else:
                self.close_when_done = close_when_done

    def toggle_colorize_event(self, event):
        if self.after_id:
            after_id = self.after_id
            self.after_id = None
            if DEBUG: print("cancel scheduled recolorizer")
            self.after_cancel(after_id)
        if self.allow_colorizing and self.colorizing:
            if DEBUG: print("stop colorizing")
            self.stop_colorizing = True
        self.allow_colorizing = not self.allow_colorizing
        if self.allow_colorizing and not self.colorizing:
            self.after_id = self.after(1, self.recolorize)
        if DEBUG:
            print("auto colorizing turned",\
                  self.allow_colorizing and "on" or "off")
        return "break"

    def recolorize(self):
        self.after_id = None
        if not self.delegate:
            if DEBUG: print("no delegate")
            return
        if not self.allow_colorizing:
            if DEBUG: print("auto colorizing is off")
            return
        if self.colorizing:
            if DEBUG: print("already colorizing")
            return
        try:
            self.stop_colorizing = False
            self.colorizing = True
            if DEBUG: print("colorizing...")
            t0 = time.perf_counter()
            self.recolorize_main()
            t1 = time.perf_counter()
            if DEBUG: print("%.3f seconds" % (t1-t0))
        finally:
            self.colorizing = False
        if self.allow_colorizing and self.tag_nextrange("TODO", "1.0"):
            if DEBUG: print("reschedule colorizing")
            self.after_id = self.after(1, self.recolorize)
        if self.close_when_done:
            top = self.close_when_done
            self.close_when_done = None
            top.destroy()

    def recolorize_main(self):
        next = "1.0"
        while True:
            item = self.tag_nextrange("TODO", next)
            if not item:
                break
            head, tail = item
            self.tag_remove("SYNC", head, tail)
            item = self.tag_prevrange("SYNC", head)
            if item:
                head = item[1]
            else:
                head = "1.0"

            chars = ""
            next = head
            lines_to_get = 1
            ok = False
            while not ok:
                mark = next
                next = self.index(mark + "+%d lines linestart" %
                                         lines_to_get)
                lines_to_get = min(lines_to_get * 2, 100)
                ok = "SYNC" in self.tag_names(next + "-1c")
                line = self.get(mark, next)
                ##print head, "get", mark, next, "->", repr(line)
                if not line:
                    return
                for tag in self.tagdefs:
                    self.tag_remove(tag, mark, next)
                chars = chars + line
                m = self.prog.search(chars)
                while m:
                    for key, value in m.groupdict().items():
                        if value:
                            a, b = m.span(key)
                            self.tag_add(key,
                                         head + "+%dc" % a,
                                         head + "+%dc" % b)
                            if value in ("def", "class"):
                                m1 = self.idprog.match(chars, b)
                                if m1:
                                    a, b = m1.span(1)
                                    self.tag_add("DEFINITION",
                                                 head + "+%dc" % a,
                                                 head + "+%dc" % b)
                    m = self.prog.search(chars, m.end())
                if "SYNC" in self.tag_names(next + "-1c"):
                    head = next
                    chars = ""
                else:
                    ok = False
                if not ok:
                    # We're in an inconsistent state, and the call to
                    # update may tell us to stop.  It may also change
                    # the correct value for "next" (since this is a
                    # line.col string, not a true mark).  So leave a
                    # crumb telling the next invocation to resume here
                    # in case update tells us to leave.
                    self.tag_add("TODO", next)
                self.update()
                if self.stop_colorizing:
                    if DEBUG: print("colorizing stopped")
                    return

    def removecolors(self):
        for tag in self.tagdefs:
            self.tag_remove(tag, "1.0", "end")


def _color_delegator(parent):  # htest #
    from tkinter import Toplevel, Text
    from idlelib.percolator import Percolator

    top = Toplevel(parent)
    top.title("Test ColorDelegator")
    x, y = map(int, parent.geometry().split('+')[1:])
    top.geometry("700x250+%d+%d" % (x + 20, y + 175))
    source = (
        "if True: int ('1') # keyword, builtin, string, comment\n"
        "elif False: print(0)\n"
        "else: float(None)\n"
        "if iF + If + IF: 'keyword matching must respect case'\n"
        "if'': x or''  # valid string-keyword no-space combinations\n"
        "async def f(): await g()\n"
        "# All valid prefixes for unicode and byte strings should be colored.\n"
        "'x', '''x''', \"x\", \"\"\"x\"\"\"\n"
        "r'x', u'x', R'x', U'x', f'x', F'x'\n"
        "fr'x', Fr'x', fR'x', FR'x', rf'x', rF'x', Rf'x', RF'x'\n"
        "b'x',B'x', br'x',Br'x',bR'x',BR'x', rb'x'.rB'x',Rb'x',RB'x'\n"
        "# Invalid combinations of legal characters should be half colored.\n"
        "ur'x', ru'x', uf'x', fu'x', UR'x', ufr'x', rfu'x', xf'x', fx'x'\n"
        )
    text = Text(top, background="white")
    text.pack(expand=1, fill="both")
    text.insert("insert", source)
    text.focus_set()

    color_config(text)
    p = Percolator(text)
    d = ColorDelegator()
    p.insertfilter(d)


if __name__ == "__main__":
    from unittest import main
    main('idlelib.idle_test.test_colorizer', verbosity=2, exit=False)

    from idlelib.idle_test.htest import run
    run(_color_delegator)