"""Textual pieces shared by the dprompt and dbanner editors."""

import os
import subprocess
import sys

from rich.style import Style
from rich.text import Text
from textual import events
from textual.containers import Horizontal, Vertical
from textual.message import Message
from textual.screen import ModalScreen
from textual.widget import Widget
from textual.widgets import Button, Input, Label, Select

from . import colors
from .i18n import t

NONE = "-"  # Select has no None value


def color_options(allow_none=True):
    names = {
        "black": ("чорний", "black"), "red": ("червоний", "red"), "green": ("зелений", "green"),
        "yellow": ("жовтий", "yellow"), "blue": ("синій", "blue"), "magenta": ("пурпуровий", "magenta"),
        "cyan": ("бірюзовий", "cyan"), "white": ("білий", "white"),
    }
    opts = [(t("— типовий —", "— default —"), NONE)] if allow_none else []
    for c in colors.NAMES:
        base = c[7:] if c.startswith("bright_") else c
        label = t(*names[base])
        if c.startswith("bright_"):
            label = t("яскравий ", "bright ") + label
        opts.append((Text.assemble(("██ ", c), label), c))
    return opts


def color_value(value):
    return None if value in (NONE, Select.NULL, None) else value


def to_select(color):
    return color if color in colors.NAMES else NONE


class Swatches(Widget):
    """A row of the 16 colors (and "none") to click; the chosen one is marked."""

    DEFAULT_CSS = """
    Swatches { height: 2; width: 36; }
    """

    class Picked(Message):
        def __init__(self, swatches, color):
            super().__init__()
            self.swatches, self.color = swatches, color

    def __init__(self, color=None, allow_none=True, **kw):
        super().__init__(**kw)
        self.color, self.allow_none = color, allow_none

    def _items(self):
        return ([None] if self.allow_none else []) + list(colors.NAMES)

    def render(self):
        text = Text()
        for i, c in enumerate(self._items()):
            if i == 9:
                text.append("\n")
            mark = "▣" if c == self.color else "■"
            if c is None:
                text.append("∅ " if c != self.color else "▣ ", Style(bold=True))
            else:
                text.append(mark * 2 + " " if c == self.color else "██ ", Style(color=c))
        return text

    def on_click(self, event: events.Click):
        items = self._items()
        index = (event.y * 9) + event.x // 3
        if 0 <= event.x // 3 < 9 and 0 <= index < len(items):
            self.color = items[index]
            self.refresh()
            self.post_message(self.Picked(self, self.color))


class AskDialog(ModalScreen):
    """A few text fields with OK/Cancel; dismisses with {key: value} or None."""

    DEFAULT_CSS = """
    AskDialog { align: center middle; }
    AskDialog > Vertical { width: 72; height: auto; border: round $accent; background: $surface; padding: 1 2; }
    AskDialog Label { margin-top: 1; }
    AskDialog Horizontal { height: auto; margin-top: 1; align-horizontal: right; }
    AskDialog Button { margin-left: 2; }
    """
    BINDINGS = [("escape", "cancel", t("Скасувати", "Cancel"))]

    def __init__(self, heading, fields):
        """fields: [(key, label, value or a list of (label, value) choices, current)]"""
        super().__init__()
        self.heading, self.fields = heading, fields

    def compose(self):
        with Vertical():
            yield Label(Text(self.heading, style="bold"))
            for key, label, value, *rest in self.fields:
                yield Label(Text(label))
                if isinstance(value, list):
                    yield Select(value, value=rest[0] if rest else value[0][1], allow_blank=False, id="f_" + key)
                else:
                    yield Input(str(value), id="f_" + key)
            with Horizontal():
                yield Button(t("Скасувати", "Cancel"), id="cancel")
                yield Button("OK", variant="primary", id="ok")

    def on_mount(self):
        inputs = self.query(Input)
        if inputs:
            inputs.first().focus()

    def _result(self):
        return {key: self.query_one("#f_" + key).value for key, *_ in self.fields}

    def on_button_pressed(self, event: Button.Pressed):
        self.dismiss(self._result() if event.button.id == "ok" else None)

    def on_input_submitted(self, event: Input.Submitted):
        self.dismiss(self._result())

    def action_cancel(self):
        self.dismiss(None)


def run_as_root(app, args):
    """Runs one of our commands through sudo with the TUI suspended, so sudo can
    ask for the password. Returns True on success."""
    exe = "/usr/bin/" + args[0]
    if os.path.exists(exe):
        cmd = [exe] + args[1:]
    else:  # from the source tree
        module = {"dprompt": "das_shell.cli_prompt", "dbanner": "das_shell.cli_banner"}[args[0]]
        env = [f"{k}={os.environ[k]}" for k in ("PYTHONPATH", "DAS_SHELL_DATA", "DAS_SHELL_ETC", "DAS_SHELL_CACHE")
               if k in os.environ]
        cmd = ["env"] + env + [sys.executable, "-m", module] + args[1:]
    if os.geteuid() != 0:
        cmd = ["sudo"] + cmd
    with app.suspend():
        print("\n$ " + " ".join(cmd))
        code = subprocess.run(cmd).returncode
        if code:
            input(t("Помилка. Enter — повернутися…", "Failed. Press Enter to go back…"))
    return code == 0


def bar(*buttons):
    row = Horizontal(*buttons, classes="buttons")
    return row