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from typing import TYPE_CHECKING, Optional

from .align import AlignMethod
from .box import ROUNDED, Box
from .cells import cell_len
from .jupyter import JupyterMixin
from .measure import Measurement, measure_renderables
from .padding import Padding, PaddingDimensions
from .segment import Segment
from .style import Style, StyleType
from .text import Text, TextType

if TYPE_CHECKING:
    from .console import Console, ConsoleOptions, RenderableType, RenderResult


class Panel(JupyterMixin):
    """A console renderable that draws a border around its contents.

    Example:
        >>> console.print(Panel("Hello, World!"))

    Args:
        renderable (RenderableType): A console renderable object.
        box (Box): A Box instance that defines the look of the border (see :ref:`appendix_box`. Defaults to box.ROUNDED.
        title (Optional[TextType], optional): Optional title displayed in panel header. Defaults to None.
        title_align (AlignMethod, optional): Alignment of title. Defaults to "center".
        subtitle (Optional[TextType], optional): Optional subtitle displayed in panel footer. Defaults to None.
        subtitle_align (AlignMethod, optional): Alignment of subtitle. Defaults to "center".
        safe_box (bool, optional): Disable box characters that don't display on windows legacy terminal with *raster* fonts. Defaults to True.
        expand (bool, optional): If True the panel will stretch to fill the console width, otherwise it will be sized to fit the contents. Defaults to True.
        style (str, optional): The style of the panel (border and contents). Defaults to "none".
        border_style (str, optional): The style of the border. Defaults to "none".
        width (Optional[int], optional): Optional width of panel. Defaults to None to auto-detect.
        height (Optional[int], optional): Optional height of panel. Defaults to None to auto-detect.
        padding (Optional[PaddingDimensions]): Optional padding around renderable. Defaults to 0.
        highlight (bool, optional): Enable automatic highlighting of panel title (if str). Defaults to False.
    """

    def __init__(
        self,
        renderable: "RenderableType",
        box: Box = ROUNDED,
        *,
        title: Optional[TextType] = None,
        title_align: AlignMethod = "center",
        subtitle: Optional[TextType] = None,
        subtitle_align: AlignMethod = "center",
        safe_box: Optional[bool] = None,
        expand: bool = True,
        style: StyleType = "none",
        border_style: StyleType = "none",
        width: Optional[int] = None,
        height: Optional[int] = None,
        padding: PaddingDimensions = (0, 1),
        highlight: bool = False,
    ) -> None:
        self.renderable = renderable
        self.box = box
        self.title = title
        self.title_align: AlignMethod = title_align
        self.subtitle = subtitle
        self.subtitle_align = subtitle_align
        self.safe_box = safe_box
        self.expand = expand
        self.style = style
        self.border_style = border_style
        self.width = width
        self.height = height
        self.padding = padding
        self.highlight = highlight

    @classmethod
    def fit(
        cls,
        renderable: "RenderableType",
        box: Box = ROUNDED,
        *,
        title: Optional[TextType] = None,
        title_align: AlignMethod = "center",
        subtitle: Optional[TextType] = None,
        subtitle_align: AlignMethod = "center",
        safe_box: Optional[bool] = None,
        style: StyleType = "none",
        border_style: StyleType = "none",
        width: Optional[int] = None,
        height: Optional[int] = None,
        padding: PaddingDimensions = (0, 1),
        highlight: bool = False,
    ) -> "Panel":
        """An alternative constructor that sets expand=False."""
        return cls(
            renderable,
            box,
            title=title,
            title_align=title_align,
            subtitle=subtitle,
            subtitle_align=subtitle_align,
            safe_box=safe_box,
            style=style,
            border_style=border_style,
            width=width,
            height=height,
            padding=padding,
            highlight=highlight,
            expand=False,
        )

    @property
    def _title(self) -> Optional[Text]:
        if self.title:
            title_text = (
                Text.from_markup(self.title)
                if isinstance(self.title, str)
                else self.title.copy()
            )
            title_text.end = ""
            title_text.plain = title_text.plain.replace("\n", " ")
            title_text.no_wrap = True
            title_text.expand_tabs()
            title_text.pad(1)
            return title_text
        return None

    @property
    def _subtitle(self) -> Optional[Text]:
        if self.subtitle:
            subtitle_text = (
                Text.from_markup(self.subtitle)
                if isinstance(self.subtitle, str)
                else self.subtitle.copy()
            )
            subtitle_text.end = ""
            subtitle_text.plain = subtitle_text.plain.replace("\n", " ")
            subtitle_text.no_wrap = True
            subtitle_text.expand_tabs()
            subtitle_text.pad(1)
            return subtitle_text
        return None

    def __rich_console__(
        self, console: "Console", options: "ConsoleOptions"
    ) -> "RenderResult":
        _padding = Padding.unpack(self.padding)
        renderable = (
            Padding(self.renderable, _padding) if any(_padding) else self.renderable
        )
        style = console.get_style(self.style)
        partial_border_style = console.get_style(self.border_style)
        border_style = style + partial_border_style
        width = (
            options.max_width
            if self.width is None
            else min(options.max_width, self.width)
        )

        safe_box: bool = console.safe_box if self.safe_box is None else self.safe_box
        box = self.box.substitute(options, safe=safe_box)

        def align_text(
            text: Text, width: int, align: str, character: str, style: Style
        ) -> Text:
            """Gets new aligned text.

            Args:
                text (Text): Title or subtitle text.
                width (int): Desired width.
                align (str): Alignment.
                character (str): Character for alignment.
                style (Style): Border style

            Returns:
                Text: New text instance
            """
            text = text.copy()
            text.truncate(width)
            excess_space = width - cell_len(text.plain)
            if text.style:
                text.stylize(console.get_style(text.style))

            if excess_space:
                if align == "left":
                    return Text.assemble(
                        text,
                        (character * excess_space, style),
                        no_wrap=True,
                        end="",
                    )
                elif align == "center":
                    left = excess_space // 2
                    return Text.assemble(
                        (character * left, style),
                        text,
                        (character * (excess_space - left), style),
                        no_wrap=True,
                        end="",
                    )
                else:
                    return Text.assemble(
                        (character * excess_space, style),
                        text,
                        no_wrap=True,
                        end="",
                    )
            return text

        title_text = self._title
        if title_text is not None:
            title_text.stylize_before(partial_border_style)

        child_width = (
            width - 2
            if self.expand
            else console.measure(
                renderable, options=options.update_width(width - 2)
            ).maximum
        )
        child_height = self.height or options.height or None
        if child_height:
            child_height -= 2
        if title_text is not None:
            child_width = min(
                options.max_width - 2, max(child_width, title_text.cell_len + 2)
            )

        width = child_width + 2
        child_options = options.update(
            width=child_width, height=child_height, highlight=self.highlight
        )
        lines = console.render_lines(renderable, child_options, style=style)

        line_start = Segment(box.mid_left, border_style)
        line_end = Segment(f"{box.mid_right}", border_style)
        new_line = Segment.line()
        if title_text is None or width <= 4:
            yield Segment(box.get_top([width - 2]), border_style)
        else:
            title_text = align_text(
                title_text,
                width - 4,
                self.title_align,
                box.top,
                border_style,
            )
            yield Segment(box.top_left + box.top, border_style)
            yield from console.render(title_text, child_options.update_width(width - 4))
            yield Segment(box.top + box.top_right, border_style)

        yield new_line
        for line in lines:
            yield line_start
            yield from line
            yield line_end
            yield new_line

        subtitle_text = self._subtitle
        if subtitle_text is not None:
            subtitle_text.stylize_before(partial_border_style)

        if subtitle_text is None or width <= 4:
            yield Segment(box.get_bottom([width - 2]), border_style)
        else:
            subtitle_text = align_text(
                subtitle_text,
                width - 4,
                self.subtitle_align,
                box.bottom,
                border_style,
            )
            yield Segment(box.bottom_left + box.bottom, border_style)
            yield from console.render(
                subtitle_text, child_options.update_width(width - 4)
            )
            yield Segment(box.bottom + box.bottom_right, border_style)

        yield new_line

    def __rich_measure__(
        self, console: "Console", options: "ConsoleOptions"
    ) -> "Measurement":
        _title = self._title
        _, right, _, left = Padding.unpack(self.padding)
        padding = left + right
        renderables = [self.renderable, _title] if _title else [self.renderable]

        if self.width is None:
            width = (
                measure_renderables(
                    console,
                    options.update_width(options.max_width - padding - 2),
                    renderables,
                ).maximum
                + padding
                + 2
            )
        else:
            width = self.width
        return Measurement(width, width)


if __name__ == "__main__":  # pragma: no cover
    from .console import Console

    c = Console()

    from .box import DOUBLE, ROUNDED
    from .padding import Padding

    p = Panel(
        "Hello, World!",
        title="rich.Panel",
        style="white on blue",
        box=DOUBLE,
        padding=1,
    )

    c.print()
    c.print(p)