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# to you under the Apache License, Version 2.0 (the
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#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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"""Helper functions in TVM Script Parser"""

from typing import Callable, List, Any, Optional, Tuple, Union

import inspect
import synr

from tvm.arith import Analyzer
from tvm.ir import Range, Span, SourceName
from tvm.tir import PrimExpr, BufferRegion
from tvm.error import DiagnosticError
from .node import BufferSlice


def get_param_list(
    func: Callable,
) -> Tuple[List[str], List[Tuple[str, Tuple[Any, ...]]], Optional[str]]:
    """Get the parameter list from definition of function"""
    full_arg_spec: inspect.FullArgSpec = inspect.getfullargspec(func)

    args: List[str]
    defaults: Optional[Tuple[Any, ...]]
    kwonlyargs: List[str]
    args, defaults, kwonlyargs = (
        full_arg_spec.args,
        full_arg_spec.defaults,
        full_arg_spec.kwonlyargs,
    )

    if defaults is None:
        defaults = tuple()

    if full_arg_spec.varkw is not None:
        raise RuntimeError(
            "TVM Script register error : variable keyword argument is not supported now"
        )

    if len(kwonlyargs) == 1 and kwonlyargs[0] == "span":
        pass
    elif not len(kwonlyargs) == 0:
        raise RuntimeError("TVM Script register error : keyword only argument is not supported now")

    pos_only: List[str] = list()
    for arg in args[: len(args) - len(defaults)]:
        if arg != "span":
            pos_only.append(arg)
    kwargs: List[Tuple[str, Tuple[Any, ...]]] = list()
    for default, arg in zip(defaults, args[len(args) - len(defaults) :]):
        if arg != "span":
            kwargs.append((arg, default))

    return pos_only, kwargs, full_arg_spec.varargs


def buffer_slice_to_region(
    buffer_slice: BufferSlice, analyzer: Optional[Analyzer] = None
) -> BufferRegion:
    """Construct BufferRegion from BufferSlice

    Parameters
    ----------
    buffer_slice : BufferSlice
        The input BufferSlice

    analyzer : Optional[tvm.arith.Analyzer]
        The analyzer for simplifying. If not provided, the method will construct a new one

    Returns
    -------
    buffer_region : BufferRegion
        The constructed BufferRegion.
    """
    region: List[Range] = []
    for s in buffer_slice.slices:
        start: Union[PrimExpr, int] = s.start
        extent: Union[PrimExpr, int] = 1 if s.stop is None else s.stop - s.start
        if not analyzer:
            analyzer = Analyzer()
        if isinstance(extent, PrimExpr):
            extent = analyzer.simplify(extent)
        region.append(Range.from_min_extent(start, extent, span=s.span))
    return BufferRegion(buffer_slice.buffer, region)


def tvm_span_from_synr(span: synr.ast.Span) -> Span:
    """Convert a synr span to a TVM span"""
    return Span(
        SourceName(span.filename),
        span.start_line,
        span.end_line,
        span.start_column,
        span.end_column,
    )


def synr_span_from_tvm(span: Span) -> synr.ast.Span:
    """Convert a TVM span to a synr span"""
    return synr.ast.Span(
        span.source_name.name,
        span.line,
        span.column,
        span.end_line,
        span.end_column,
    )


def call_with_error_reporting(
    report_error,
    node_span,
    func,
    *args,
    **kwargs,
):
    """Call function with exception handling and report error using node_span"""
    try:
        return func(*args, **kwargs)
    except DiagnosticError:
        raise
    except Exception as err:  # pylint: disable=broad-except
        # printing last non-empty row of error message.
        error_msg = list(filter(None, str(err).split("\n")))[-1]
        report_error(error_msg, node_span)