import inspect
import re
from typing import Callable, Optional, Union

import docutils.core

from nicegui import ui
from nicegui.elements.markdown import apply_tailwind

REGEX_H4 = re.compile(r'<h4.*?>(.*?)</h4>')
SPECIAL_CHARACTERS = re.compile('[^(a-z)(A-Z)(0-9)-]')
PYTHON_BGCOLOR = '#e3e9f2'
PYTHON_COLOR = '#eff5ff'
BASH_BGCOLOR = '#dcdcdc'
BASH_COLOR = '#e8e8e8'
BROWSER_BGCOLOR = '#f2f2f2'
BROWSER_COLOR = '#ffffff'


class example:

    def __init__(self, content: Union[Callable, type, str], browser_title: Optional[str] = None) -> None:
        self.content = content
        self.browser_title = browser_title

    def __call__(self, f: Callable) -> Callable:
        with ui.column().classes('w-full mb-8'):
            if isinstance(self.content, str):
                documentation = ui.markdown(self.content)
            else:
                doc = self.content.__doc__ or self.content.__init__.__doc__
                html: str = docutils.core.publish_parts(doc, writer_name='html5_polyglot')['html_body']
                html = html.replace('<p>', '<h4>', 1)
                html = html.replace('</p>', '</h4>', 1)
                html = html.replace('param ', '')
                html = apply_tailwind(html)
                documentation = ui.html(html)
            _add_html_anchor(documentation.classes('text-lg documentation bold-links'))

            with ui.column().classes('w-full items-stretch gap-8 no-wrap xl:flex-row'):
                code = inspect.getsource(f).split('# END OF EXAMPLE')[0].strip().splitlines()
                while not code[0].startswith(' ' * 8):
                    del code[0]
                code = [l[8:] for l in code]
                code.insert(0, '```python')
                code.insert(1, 'from nicegui import ui')
                if code[2].split()[0] not in ['from', 'import']:
                    code.insert(2, '')
                for l, line in enumerate(code):
                    if line.startswith('# ui.'):
                        code[l] = line[2:]
                    if line.startswith('# ui.run('):
                        break
                else:
                    code.append('')
                    code.append('ui.run()')
                code.append('```')
                code = '\n'.join(code)
                with python_window(classes='w-full max-w-[48rem]'):
                    ui.markdown(code)
                with browser_window(self.browser_title, classes='w-full max-w-[48rem] xl:max-w-[20rem] min-h-[10rem] browser-window'):
                    f()
        return f


def _add_html_anchor(element: ui.html) -> None:
    html = element.content
    match = REGEX_H4.search(html)
    if not match:
        return
    headline = match.groups()[0].strip()
    headline_id = SPECIAL_CHARACTERS.sub('_', headline).lower()
    if not headline_id:
        return

    icon = '<span class="material-icons">link</span>'
    link = f'<a href="reference#{headline_id}" class="hover:text-black" style="color: #ddd">{icon}</a>'
    target = f'<div id="{headline_id}" style="position: relative; top: -90px"></div>'
    html = html.replace('<h4', f'{target}<h4', 1)
    html = html.replace('</h4>', f' {link}</h4>', 1)
    element.content = html


def _window_header(bgcolor: str) -> ui.row():
    return ui.row().classes(f'w-full h-8 p-2 bg-[{bgcolor}]')


def _dots() -> None:
    with ui.row().classes('gap-1 relative left-[1px] top-[1px]'):
        ui.icon('circle').classes('text-[13px] text-red-400')
        ui.icon('circle').classes('text-[13px] text-yellow-400')
        ui.icon('circle').classes('text-[13px] text-green-400')


def _title(title: str) -> None:
    ui.label(title).classes('text-sm text-gray-600 absolute left-1/2 top-[6px]').style('transform: translateX(-50%)')


def _tab(name: str, color: str, bgcolor: str) -> None:
    with ui.row().classes('gap-0'):
        with ui.label().classes(f'w-2 h-[24px] bg-[{color}]'):
            ui.label().classes(f'w-full h-full bg-[{bgcolor}] rounded-br-[6px]')
        ui.label(name).classes(f'text-sm text-gray-600 px-6 py-1 h-[24px] rounded-t-[6px] bg-[{color}]')
        with ui.label().classes(f'w-2 h-[24px] bg-[{color}]'):
            ui.label().classes(f'w-full h-full bg-[{bgcolor}] rounded-bl-[6px]')


def window(color: str, bgcolor: str, *, title: str = '', tab: str = '', classes: str = '') -> ui.column:
    with ui.card().classes(f'no-wrap bg-[{color}] rounded-xl p-0 gap-0 {classes}') \
            .style('box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1)'):
        with _window_header(bgcolor):
            _dots()
            if title:
                _title(title)
            if tab:
                _tab(tab, color, bgcolor)
        return ui.column().classes('w-full h-full overflow-auto')


def python_window(*, classes: str = '') -> ui.card:
    return window(PYTHON_COLOR, PYTHON_BGCOLOR, title='main.py', classes=classes).classes('p-2 python-window')


def bash_window(*, classes: str = '') -> ui.card:
    return window(BASH_COLOR, BASH_BGCOLOR, title='bash', classes=classes).classes('p-2 bash-window')


def browser_window(title: Optional[str] = None, *, classes: str = '') -> ui.card:
    return window(BROWSER_COLOR, BROWSER_BGCOLOR, tab=title or 'NiceGUI', classes=classes).classes('p-4 browser-window')