#!/usr/bin/env python
# vim:fileencoding=utf-8
from __future__ import (unicode_literals, division, absolute_import,
                        print_function)

__license__ = 'GPL v3'
__copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'

from collections import namedtuple

from PyQt4.Qt import (
    QColor, QBrush, QFont, QApplication, QPalette, QComboBox,
    QPushButton, QIcon, QFormLayout, QLineEdit, QWidget, QScrollArea,
    QVBoxLayout, Qt, QHBoxLayout, pyqtSignal, QPixmap, QColorDialog,
    QToolButton, QCheckBox, QSize, QLabel, QSplitter, QTextCharFormat)

from calibre.gui2 import error_dialog
from calibre.gui2.tweak_book import tprefs
from calibre.gui2.tweak_book.editor import syntax_text_char_format
from calibre.gui2.tweak_book.widgets import Dialog

underline_styles = {'single', 'dash', 'dot', 'dash_dot', 'dash_dot_dot', 'wave', 'spell'}

_default_theme = None
def default_theme():
    global _default_theme
    if _default_theme is None:
        isdark = QApplication.instance().palette().color(QPalette.WindowText).lightness() > 128
        _default_theme = 'wombat-dark' if isdark else 'pyte-light'
    return _default_theme

# The solarized themes {{{
SLDX = {'base03':'1c1c1c', 'base02':'262626', 'base01':'585858', 'base00':'626262', 'base0':'808080', 'base1':'8a8a8a', 'base2':'e4e4e4', 'base3':'ffffd7', 'yellow':'af8700', 'orange':'d75f00', 'red':'d70000', 'magenta':'af005f', 'violet':'5f5faf', 'blue':'0087ff', 'cyan':'00afaf', 'green':'5f8700'}  # noqa
SLD  = {'base03':'002b36', 'base02':'073642', 'base01':'586e75', 'base00':'657b83', 'base0':'839496', 'base1':'93a1a1', 'base2':'eee8d5', 'base3':'fdf6e3', 'yellow':'b58900', 'orange':'cb4b16', 'red':'dc322f', 'magenta':'d33682', 'violet':'6c71c4', 'blue':'268bd2', 'cyan':'2aa198', 'green':'859900'}  # noqa
m = {'base%d'%n:'base%02d'%n for n in xrange(1, 4)}
m.update({'base%02d'%n:'base%d'%n for n in xrange(1, 4)})
SLL = {m.get(k, k) : v for k, v in SLD.iteritems()}
SLLX = {m.get(k, k) : v for k, v in SLDX.iteritems()}
SOLARIZED = \
    '''
    CursorLine   bg={base02}
    CursorColumn bg={base02}
    ColorColumn  bg={base02}
    HighlightRegion bg={base00}
    MatchParen   bg={base02} fg={magenta}
    Pmenu        fg={base0} bg={base02}
    PmenuSel     fg={base01} bg={base2}

    Cursor       fg={base03} bg={base0}
    Normal       fg={base0} bg={base03}
    LineNr       fg={base01} bg={base02}
    LineNrC      fg={magenta}
    Visual       fg={base01} bg={base03}

    Comment      fg={base01} italic
    Todo         fg={magenta} bold
    String       fg={cyan}
    Constant     fg={cyan}
    Number       fg={cyan}
    PreProc      fg={orange}
    Identifier   fg={blue}
    Function     fg={blue}
    Type         fg={yellow}
    Statement    fg={green} bold
    Keyword      fg={green}
    Special      fg={red}
    SpecialCharacter bg={base02}

    Error        us=wave uc={red}
    SpellError   us=wave uc={orange}
    Tooltip      fg=black bg=ffffed
    Link         fg={blue}

    DiffDelete   bg={base02} fg={red}
    DiffInsert   bg={base02} fg={green}
    DiffReplace  bg={base02} fg={blue}
    DiffReplaceReplace bg={base03}
    '''
# }}}

THEMES = {
    'wombat-dark':  # {{{
    '''
    CursorLine   bg={cursor_loc}
    CursorColumn bg={cursor_loc}
    ColorColumn  bg={cursor_loc}
    HighlightRegion bg=3d3d3d
    MatchParen   bg=444444
    Pmenu        fg=f6f3e8 bg=444444
    PmenuSel     fg=yellow bg={identifier}
    Tooltip      fg=black bg=ffffed

    Cursor       bg=656565
    Normal       fg=f6f3e8 bg=242424
    LineNr       fg=857b6f bg=000000
    LineNrC      fg=yellow
    Visual       fg=black bg=888888

    Comment      fg={comment}
    Todo         fg=8f8f8f
    String       fg={string}
    Constant     fg={constant}
    Number       fg={constant}
    PreProc      fg={constant}
    Identifier   fg={identifier}
    Function     fg={identifier}
    Type         fg={identifier}
    Statement    fg={keyword}
    Keyword      fg={keyword}
    Special      fg=e7f6da
    Error        us=wave uc=red
    SpellError   us=wave uc=orange
    SpecialCharacter bg={cursor_loc}
    Link         fg=cyan

    DiffDelete   bg=341414 fg=642424
    DiffInsert   bg=143414 fg=246424
    DiffReplace  bg=141434 fg=242464
    DiffReplaceReplace bg=002050

    '''.format(
        cursor_loc='323232',
        identifier='cae682',
        comment='99968b',
        string='95e454',
        keyword='8ac6f2',
        constant='e5786d'),  # }}}

    'pyte-light':  # {{{
    '''
    CursorLine   bg={cursor_loc}
    CursorColumn bg={cursor_loc}
    ColorColumn  bg={cursor_loc}
    HighlightRegion bg=E3F988
    MatchParen   bg=cfcfcf
    Pmenu        fg=white bg=808080
    PmenuSel     fg=white bg=808080
    Tooltip      fg=black bg=ffffed

    Cursor       fg=black bg=b0b4b8
    Normal       fg=404850 bg=f0f0f0
    LineNr       fg=white bg=8090a0
    LineNrC      fg=yellow
    Visual       fg=white bg=8090a0

    Comment      fg={comment} italic
    Todo         fg={comment} italic bold
    String       fg={string}
    Constant     fg={constant}
    Number       fg={constant}
    PreProc      fg={constant}
    Identifier   fg={identifier}
    Function     fg={identifier}
    Type         fg={identifier}
    Statement    fg={keyword}
    Keyword      fg={keyword}
    Special      fg=70a0d0 italic
    SpecialCharacter bg={cursor_loc}
    Error        us=wave uc=red
    SpellError   us=wave uc=magenta
    Link         fg=blue

    DiffDelete   bg=rgb(255,180,200) fg=rgb(200,80,110)
    DiffInsert   bg=rgb(180,255,180) fg=rgb(80,210,80)
    DiffReplace  bg=rgb(206,226,250) fg=rgb(90,130,180)
    DiffReplaceReplace bg=rgb(180,210,250)

    '''.format(
        cursor_loc='F8DE7E',
        identifier='7b5694',
        comment='a0b0c0',
        string='4070a0',
        keyword='007020',
        constant='a07040'),  # }}}

    'solarized-x-dark': SOLARIZED.format(**SLDX),
    'solarized-dark': SOLARIZED.format(**SLD),
    'solarized-light': SOLARIZED.format(**SLL),
    'solarized-x-light': SOLARIZED.format(**SLLX),

}

def read_color(col):
    if QColor.isValidColor(col):
        return QBrush(QColor(col))
    if col.startswith('rgb('):
        r, g, b = map(int, (x.strip() for x in col[4:-1].split(',')))
        return QBrush(QColor(r, g, b))
    try:
        r, g, b = col[0:2], col[2:4], col[4:6]
        r, g, b = int(r, 16), int(g, 16), int(b, 16)
        return QBrush(QColor(r, g, b))
    except Exception:
        pass

Highlight = namedtuple('Highlight', 'fg bg bold italic underline underline_color')

def read_theme(raw):
    ans = {}
    for line in raw.splitlines():
        line = line.strip()
        if not line or line.startswith('#'):
            continue
        bold = italic = False
        fg = bg = name = underline = underline_color = None
        line = line.partition('#')[0]
        for i, token in enumerate(line.split()):
            if i == 0:
                name = token
            else:
                if token == 'bold':
                    bold = True
                elif token == 'italic':
                    italic = True
                elif '=' in token:
                    prefix, val = token.partition('=')[0::2]
                    if prefix == 'us':
                        underline = val if val in underline_styles else None
                    elif prefix == 'uc':
                        underline_color = read_color(val)
                    elif prefix == 'fg':
                        fg = read_color(val)
                    elif prefix == 'bg':
                        bg = read_color(val)
        if name is not None:
            ans[name] = Highlight(fg, bg, bold, italic, underline, underline_color)
    return ans

THEMES = {k:read_theme(raw) for k, raw in THEMES.iteritems()}

def u(x):
    x = {'spell':'SpellCheck', 'dash_dot':'DashDot', 'dash_dot_dot':'DashDotDot'}.get(x, x.capitalize())
    if 'Dot' in x:
        return x + 'Line'
    return x + 'Underline'
underline_styles = {x:getattr(QTextCharFormat, u(x)) for x in underline_styles}

def to_highlight(data):
    data = data.copy()
    for c in ('fg', 'bg', 'underline_color'):
        data[c] = read_color(data[c]) if data.get(c, None) is not None else None
    return Highlight(**data)

def read_custom_theme(data):
    dt = THEMES[default_theme()].copy()
    dt.update({k:to_highlight(v) for k, v in data.iteritems()})
    return dt

def get_theme(name):
    try:
        return THEMES[name]
    except KeyError:
        try:
            ans = tprefs['custom_themes'][name]
        except KeyError:
            return THEMES[default_theme()]
        else:
            return read_custom_theme(ans)

def highlight_to_char_format(h):
    ans = syntax_text_char_format()
    if h.bold:
        ans.setFontWeight(QFont.Bold)
    if h.italic:
        ans.setFontItalic(True)
    if h.fg is not None:
        ans.setForeground(h.fg)
    if h.bg is not None:
        ans.setBackground(h.bg)
    if h.underline:
        ans.setUnderlineStyle(underline_styles[h.underline])
        if h.underline_color is not None:
            ans.setUnderlineColor(h.underline_color.color())
    return ans

def theme_color(theme, name, attr):
    try:
        return getattr(theme[name], attr).color()
    except (KeyError, AttributeError):
        return getattr(THEMES[default_theme()][name], attr).color()

def theme_format(theme, name):
    try:
        h = theme[name]
    except KeyError:
        h = THEMES[default_theme()][name]
    return highlight_to_char_format(h)

def custom_theme_names():
    return tuple(tprefs['custom_themes'].iterkeys())

def builtin_theme_names():
    return tuple(THEMES.iterkeys())

def all_theme_names():
    return builtin_theme_names() + custom_theme_names()

# Custom theme creation/editing {{{

class CreateNewTheme(Dialog):

    def __init__(self, parent=None):
        Dialog.__init__(self, _('Create custom theme'), 'custom-theme-create', parent=parent)

    def setup_ui(self):
        self.l = l = QFormLayout(self)
        self.setLayout(l)

        self._name = n = QLineEdit(self)
        l.addRow(_('&Name of custom theme:'), n)

        self.base = b = QComboBox(self)
        b.addItems(sorted(builtin_theme_names()))
        l.addRow(_('&Builtin theme to base on:'), b)
        idx = b.findText(tprefs['editor_theme'] or default_theme())
        if idx == -1:
            idx = b.findText(default_theme())
        b.setCurrentIndex(idx)

        l.addRow(self.bb)

    @property
    def theme_name(self):
        return unicode(self._name.text()).strip()

    def accept(self):
        if not self.theme_name:
            return error_dialog(self, _('No name specified'), _(
                'You must specify a name for your theme'), show=True)
        if '*' + self.theme_name in custom_theme_names():
            return error_dialog(self, _('Name already used'), _(
                'A custom theme with the name %s already exists') % self.theme_name, show=True)
        return Dialog.accept(self)

def col_to_string(color):
    return '%02X%02X%02X' % color.getRgb()[:3]

class ColorButton(QPushButton):

    changed = pyqtSignal()

    def __init__(self, data, name, text, parent):
        QPushButton.__init__(self, text, parent)
        self.ic = QPixmap(self.iconSize())
        color = data[name]
        self.data, self.name = data, name
        if color is not None:
            self.current_color = read_color(color).color()
            self.ic.fill(self.current_color)
        else:
            self.ic.fill(Qt.transparent)
            self.current_color = color
        self.update_tooltip()
        self.setIcon(QIcon(self.ic))
        self.clicked.connect(self.choose_color)

    def clear(self):
        self.current_color = None
        self.update_tooltip()
        self.ic.fill(Qt.transparent)
        self.setIcon(QIcon(self.ic))
        self.data[self.name] = self.value
        self.changed.emit()

    def choose_color(self):
        col = QColorDialog.getColor(self.current_color or Qt.black, self, _('Choose color'))
        if col.isValid():
            self.current_color = col
            self.update_tooltip()
            self.ic.fill(col)
            self.setIcon(QIcon(self.ic))
            self.data[self.name] = self.value
            self.changed.emit()

    def update_tooltip(self):
        self.setToolTip(_('Red: {0} Green: {1} Blue: {2}').format(*self.current_color.getRgb()[:3]) if self.current_color else _('No color'))

    @property
    def value(self):
        if self.current_color is None:
            return None
        return col_to_string(self.current_color)

class Bool(QCheckBox):

    changed = pyqtSignal()

    def __init__(self, data, key, text, parent):
        QCheckBox.__init__(self, text, parent)
        self.data, self.key = data, key
        self.setChecked(data.get(key, False))
        self.stateChanged.connect(self._changed)

    def _changed(self, state):
        self.data[self.key] = self.value
        self.changed.emit()

    @property
    def value(self):
        return self.checkState() == Qt.Checked

class Property(QWidget):

    changed = pyqtSignal()

    def __init__(self, name, data, parent=None):
        QWidget.__init__(self, parent)
        self.l = l = QHBoxLayout(self)
        self.setLayout(l)
        self.label = QLabel(name)
        l.addWidget(self.label)
        self.data = data

        def create_color_button(key, text):
            b = ColorButton(data, key, text, self)
            b.changed.connect(self.changed), l.addWidget(b)
            bc = QToolButton(self)
            bc.setIcon(QIcon(I('clear_left.png')))
            bc.setToolTip(_('Remove color'))
            bc.clicked.connect(b.clear)
            h = QHBoxLayout()
            h.addWidget(b), h.addWidget(bc)
            return h

        for k, text in (('fg', _('&Foreground')), ('bg', _('&Background'))):
            h = create_color_button(k, text)
            l.addLayout(h)

        for k, text in (('bold', _('B&old')), ('italic', _('&Italic'))):
            w = Bool(data, k, text, self)
            w.changed.connect(self.changed)
            l.addWidget(w)

        self.underline = us = QComboBox(self)
        us.addItems(sorted(tuple(underline_styles) + ('',)))
        idx = us.findText(data.get('underline', '') or '')
        us.setCurrentIndex(max(idx, 0))
        us.currentIndexChanged.connect(self.us_changed)
        self.la = la = QLabel(_('&Underline:'))
        la.setBuddy(us)
        h = QHBoxLayout()
        h.addWidget(la), h.addWidget(us), l.addLayout(h)

        h = create_color_button('underline_color', _('Color'))
        l.addLayout(h)
        l.addStretch(1)

    def us_changed(self):
        self.data['underline'] = unicode(self.underline.currentText()) or None
        self.changed.emit()

# Help text {{{
HELP_TEXT = _('''\
<h2>Creating a custom theme</h2>

<p id="attribute" lang="und">You can create a custom syntax highlighting
theme, with your own colors and font styles. The most important
types of highlighting rules are described below. Note that not
every rule supports every kind of customization, for example,
changing font or underline styles for the <code>Cursor</code> rule
does not have any effect as that rule is used only for the color of
the blinking cursor.</p>

<p>As you make changes to your theme on the left, the changes will
be reflected live in this panel.</p>

<p xml:lang="und">
{0}
    The most important rule. Sets the
    foreground and background colors for the editor as well as the
    style of "normal" text, that is, text that does not match any
    special syntax.

{1}
    Defines the colors for text selected by the mouse.

{2}
    Defines the color for the line containing the cursor.

{3}
    Defines the colors for the line numbers on the left.

{4}
    Defines the colors for matching tags in HTML and matching
    braces in CSS.

{5}
    Used for highlighting tags in HTML

{6}
    Used for highlighting attributes in HTML

{7}
    Tag names in HTML

{8}
    Namespace prefixes in XML and constants in CSS

{9}
    Non-breaking spaces/hyphens in HTML

{10}
    Syntax errors such as <this <>

{11}
    Misspelled words such as <span lang="en">thisword</span>

{12}
    Comments like <!-- this one -->
</p>

<style type="text/css">
/* Some CSS so you can see how the highlighting rules affect it */

p.someclass {{
    font-family: serif;
    font-size: 12px;
    line-height: 1.2;
}}
</style>
''')  # }}}

class ThemeEditor(Dialog):

    def __init__(self, parent=None):
        Dialog.__init__(self, _('Create/edit custom theme'), 'custom-theme-editor', parent=parent)

    def setup_ui(self):
        self.block_show = False
        self.properties = []
        self.l = l  = QVBoxLayout(self)
        self.setLayout(l)
        h = QHBoxLayout()
        l.addLayout(h)
        self.la = la = QLabel(_('&Edit theme:'))
        h.addWidget(la)
        self.theme = t = QComboBox(self)
        la.setBuddy(t)
        t.addItems(sorted(custom_theme_names()))
        t.setMinimumWidth(200)
        if t.count() > 0:
            t.setCurrentIndex(0)
        t.currentIndexChanged[int].connect(self.show_theme)
        h.addWidget(t)

        self.add_button = b = QPushButton(QIcon(I('plus.png')), _('Add &new theme'), self)
        b.clicked.connect(self.create_new_theme)
        h.addWidget(b)

        self.remove_button = b = QPushButton(QIcon(I('minus.png')), _('&Remove theme'), self)
        b.clicked.connect(self.remove_theme)
        h.addWidget(b)
        h.addStretch(1)

        self.scroll = s = QScrollArea(self)
        self.w = w = QWidget(self)
        s.setWidget(w), s.setWidgetResizable(True)
        self.cl = cl = QVBoxLayout()
        w.setLayout(cl)

        from calibre.gui2.tweak_book.editor.text import TextEdit
        self.preview = p = TextEdit(self, expected_geometry=(73, 50))
        p.load_text(HELP_TEXT.format(
                *['<b>%s</b>' % x for x in (
                    'Normal', 'Visual', 'CursorLine', 'LineNr', 'MatchParen',
                    'Function', 'Type', 'Statement', 'Constant', 'SpecialCharacter', 'Error', 'SpellError', 'Comment'
                )]
            ))
        p.setMaximumWidth(p.size_hint.width() + 5)
        s.setMinimumWidth(600)
        self.splitter = sp = QSplitter(self)
        l.addWidget(sp)
        sp.addWidget(s), sp.addWidget(p)

        self.bb.clear()
        self.bb.addButton(self.bb.Close)
        l.addWidget(self.bb)

        if self.theme.count() > 0:
            self.show_theme()

    def update_theme(self, name):
        data = tprefs['custom_themes'][name]
        extra = set(data.iterkeys()) - set(THEMES[default_theme()].iterkeys())
        missing = set(THEMES[default_theme()].iterkeys()) - set(data.iterkeys())
        for k in extra:
            data.pop(k)
        for k in missing:
            data[k] = dict(THEMES[default_theme()][k]._asdict())
            for nk, nv in data[k].iteritems():
                if isinstance(nv, QBrush):
                    data[k][nk] = unicode(nv.color().name())
        if extra or missing:
            tprefs['custom_themes'][name] = data
        return data

    def show_theme(self):
        if self.block_show:
            return
        for c in self.properties:
            c.changed.disconnect()
            self.cl.removeWidget(c)
            c.setParent(None)
            c.deleteLater()
        self.properties = []
        name = unicode(self.theme.currentText())
        if not name:
            return
        data = self.update_theme(name)
        maxw = 0
        for k in sorted(data):
            w = Property(k, data[k], parent=self)
            w.changed.connect(self.changed)
            self.properties.append(w)
            maxw = max(maxw, w.label.sizeHint().width())
            self.cl.addWidget(w)
        for p in self.properties:
            p.label.setMinimumWidth(maxw), p.label.setMaximumWidth(maxw)
        self.preview.apply_theme(read_custom_theme(data))

    @property
    def theme_name(self):
        return unicode(self.theme.currentText())

    def changed(self):
        name = self.theme_name
        data = self.update_theme(name)
        self.preview.apply_theme(read_custom_theme(data))

    def create_new_theme(self):
        d = CreateNewTheme(self)
        if d.exec_() == d.Accepted:
            name = '*' + d.theme_name
            base = unicode(d.base.currentText())
            theme = {}
            for key, val in THEMES[base].iteritems():
                theme[key] = {k:col_to_string(v.color()) if isinstance(v, QBrush) else v for k, v in val._asdict().iteritems()}
            tprefs['custom_themes'][name] = theme
            tprefs['custom_themes'] = tprefs['custom_themes']
            t = self.theme
            self.block_show = True
            t.clear(), t.addItems(sorted(custom_theme_names()))
            t.setCurrentIndex(t.findText(name))
            self.block_show = False
            self.show_theme()

    def remove_theme(self):
        name = self.theme_name
        if name:
            tprefs['custom_themes'].pop(name, None)
            tprefs['custom_themes'] = tprefs['custom_themes']
            t = self.theme
            self.block_show = True
            t.clear(), t.addItems(sorted(custom_theme_names()))
            if t.count() > 0:
                t.setCurrentIndex(0)
            self.block_show = False
            self.show_theme()

    def sizeHint(self):
        g = QApplication.instance().desktop().availableGeometry(self.parent() or self)
        return QSize(min(1500, g.width() - 25), 650)
# }}}

if __name__ == '__main__':
    app = QApplication([])
    d = ThemeEditor()
    d.exec_()
    del app
