from __future__ import absolute_import

import platform
import sys
from dataclasses import dataclass, field
from traceback import extract_tb
from types import TracebackType
from typing import List, Optional, Type

from ._loop import loop_last
from .console import (
    Console,
    ConsoleOptions,
    ConsoleRenderable,
    RenderResult,
    render_group,
)
from .constrain import Constrain
from .highlighter import RegexHighlighter, ReprHighlighter
from .padding import Padding
from .panel import Panel
from .rule import Rule
from .segment import Segment
from .syntax import Syntax
from .text import Text

WINDOWS = platform.system() == "Windows"


def install(
    width: Optional[int] = 100, extra_lines: int = 3, theme: Optional[str] = None
) -> None:
    """Install a rich traceback handler.

    Once installed, any tracebacks will be printed with syntax highlighting and rich formatting.
    
    
    Args:
        width (Optional[int], optional): Width (in characters) of traceback. Defaults to 100.
        extra_lines (int, optional): Extra lines of code. Defaults to 3.
        theme (Optional[str], optional): Pygments theme to use in traceback. Defaults to ``None`` which will pick
            a theme appropriate for the platform. 

    """
    console = Console(file=sys.stderr)

    def excepthook(
        type_: Type[BaseException], value: BaseException, traceback: TracebackType,
    ) -> None:
        console.print(
            Traceback.from_exception(
                type_,
                value,
                traceback,
                width=width,
                extra_lines=extra_lines,
                theme=theme,
            )
        )

    sys.excepthook = excepthook


@dataclass
class Frame:
    filename: str
    lineno: int
    name: str
    line: str = ""


@dataclass
class _SyntaxError:
    offset: int
    filename: str
    line: str
    lineno: int
    msg: str


@dataclass
class Stack:
    exc_type: str
    exc_value: str
    syntax_error: Optional[_SyntaxError] = None
    frames: List[Frame] = field(default_factory=list)


@dataclass
class Trace:
    stacks: List[Stack]


class PathHighlighter(RegexHighlighter):
    highlights = [r'"(?P<dim>.*/)(?P<_>.+)"']


class Traceback:
    """A Console renderable that renders a traceback.
    
    Args:
        trace (Trace, optional): A `Trace` object produced from `extract`. Defaults to None, which uses
            the last exception.
        width (Optional[int], optional): Number of characters used to traceback. Defaults to 100.
        extra_lines (int, optional): Additional lines of code to render. Defaults to 3.
        theme (str, optional): Override pygments theme used in traceback.
    """

    def __init__(
        self,
        trace: Trace = None,
        width: Optional[int] = 88,
        extra_lines: int = 3,
        theme: Optional[str] = None,
    ):
        if trace is None:
            exc_type, exc_value, traceback = sys.exc_info()
            if exc_type is None or exc_value is None or traceback is None:
                raise ValueError(
                    "Value for 'trace' required if not called in except: block"
                )
            trace = self.extract(exc_type, exc_value, traceback)
        self.trace = trace
        self.width = width
        self.extra_lines = extra_lines
        self.theme = theme

    @classmethod
    def from_exception(
        cls,
        exc_type: Type[BaseException],
        exc_value: BaseException,
        traceback: TracebackType,
        width: Optional[int] = 100,
        extra_lines: int = 3,
        theme: Optional[str] = None,
    ):
        rich_traceback = cls.extract(exc_type, exc_value, traceback)
        return Traceback(
            rich_traceback, width=width, extra_lines=extra_lines, theme=theme
        )

    @classmethod
    def extract(
        cls,
        exc_type: Type[BaseException],
        exc_value: BaseException,
        traceback: TracebackType,
    ) -> Trace:
        """Extrace traceback information.
        
        Args:
            exc_type (Type[BaseException]): Exception type.
            exc_value (BaseException): Exception value.
            traceback (TracebackType): Python Traceback object.
        
        Returns:
            Trace: A Trace instance which you can use to construct a `Traceback`.
        """
        stacks: List[Stack] = []
        while True:
            stack = Stack(exc_type=str(exc_type.__name__), exc_value=str(exc_value))

            if isinstance(exc_value, SyntaxError):
                stack.syntax_error = _SyntaxError(
                    offset=exc_value.offset or 0,
                    filename=exc_value.filename,
                    lineno=exc_value.lineno,
                    line=exc_value.text or "",
                    msg=exc_value.msg,
                )

            stacks.append(stack)
            append = stack.frames.append

            for frame_summary in extract_tb(traceback):
                frame = Frame(
                    filename=frame_summary.filename,
                    lineno=frame_summary.lineno,
                    name=frame_summary.name,
                )
                append(frame)

            cause = exc_value.__context__
            if cause and cause.__traceback__:
                exc_type = cause.__class__
                exc_value = cause
                traceback = cause.__traceback__
                continue
            break
        trace = Trace(stacks=stacks)
        return trace

    def __console__(self, console: Console, options: ConsoleOptions) -> RenderResult:
        highlighter = ReprHighlighter()
        for last, stack in loop_last(reversed(self.trace.stacks)):
            if stack.frames:
                yield Text.from_markup("[b]Traceback[/b] [dim](most recent call last):")
                stack_renderable: ConsoleRenderable = Panel(
                    self._render_stack(stack), style="blue", expand=False
                )
                stack_renderable = Constrain(stack_renderable, self.width)
                yield stack_renderable
            if stack.syntax_error is not None:
                yield Constrain(
                    Panel(
                        self._render_syntax_error(stack.syntax_error),
                        style="red",
                        expand=False,
                    ),
                    self.width,
                )
                yield Text.assemble(
                    (f"{stack.exc_type}: ", "traceback.exc_type"), end=""
                )
                yield highlighter(stack.syntax_error.msg)
            else:
                yield Text.assemble(
                    (f"{stack.exc_type}: ", "traceback.exc_type"), end=""
                )
                yield highlighter(stack.exc_value)
            if not last:
                yield Text.from_markup(
                    "\n[i]During handling of the above exception, another exception occurred:\n\n",
                )

    @render_group()
    def _render_syntax_error(self, syntax_error: _SyntaxError) -> RenderResult:
        highlighter = ReprHighlighter()
        path_highlighter = PathHighlighter()
        text = Text.assemble(
            (" File ", "traceback.text"),
            (f'"{syntax_error.filename}"', "traceback.filename"),
            (", line ", "traceback.text"),
            (str(syntax_error.lineno), "traceback.lineno"),
        )
        yield path_highlighter(text)
        yield highlighter("   " + syntax_error.line)
        yield Text.from_markup(
            "   " + " " * (syntax_error.offset - 1) + "[traceback.offset]▲[/]\n"
        )

    @render_group()
    def _render_stack(self, stack: Stack) -> RenderResult:
        path_highlighter = PathHighlighter()
        theme = self.theme or ("fruity" if WINDOWS else "monokai")
        for frame in stack.frames:
            text = Text.assemble(
                (" File ", "traceback.text"),
                (f'"{frame.filename}"', "traceback.filename"),
                (", line ", "traceback.text"),
                (str(frame.lineno), "traceback.lineno"),
                (", in ", "traceback.text"),
                (frame.name, "traceback.name"),
            )
            yield path_highlighter(text)
            if frame.filename.startswith("<"):
                continue
            try:
                syntax = Syntax.from_path(
                    frame.filename,
                    theme=theme,
                    line_numbers=True,
                    line_range=(
                        frame.lineno - self.extra_lines,
                        frame.lineno + self.extra_lines,
                    ),
                    highlight_lines={frame.lineno},
                )
            except Exception:
                pass
            else:
                yield Padding.indent(syntax, 2)


if __name__ == "__main__":  # pragma: no cover

    from .console import Console

    console = Console()
    import sys

    def bar(a):  # 这是对亚洲语言支持的测试。面对模棱两可的想法，拒绝猜测的诱惑
        print(1 / a)

    def foo(a):
        bar(a)

    try:
        try:
            foo(0)
        except:
            slfkjsldkfj  # type: ignore
    except:
        tb = Traceback()
        # print(fooads)
        console.print(tb)
