from __future__ import absolute_import, division

import pandas as pd

from datashader.core import bypixel
from datashader.compiler import compile_components
from datashader.glyphs.points import _PointLike, _GeometryLike
from datashader.glyphs.area import _AreaToLineLike
from datashader.utils import Dispatcher
from collections import OrderedDict

__all__ = ()


@bypixel.pipeline.register(pd.DataFrame)
def pandas_pipeline(df, schema, canvas, glyph, summary):
    return glyph_dispatch(glyph, df, schema, canvas, summary)


glyph_dispatch = Dispatcher()


@glyph_dispatch.register(_PointLike)
@glyph_dispatch.register(_GeometryLike)
@glyph_dispatch.register(_AreaToLineLike)
def default(glyph, source, schema, canvas, summary, cuda=False):
    create, info, append, _, finalize = compile_components(summary, schema, glyph, cuda)
    x_mapper = canvas.x_axis.mapper
    y_mapper = canvas.y_axis.mapper
    extend = glyph._build_extend(x_mapper, y_mapper, info, append)

    x_range = canvas.x_range or glyph.compute_x_bounds(source)
    y_range = canvas.y_range or glyph.compute_y_bounds(source)

    width = canvas.plot_width
    height = canvas.plot_height

    x_st = canvas.x_axis.compute_scale_and_translate(x_range, width)
    y_st = canvas.y_axis.compute_scale_and_translate(y_range, height)

    x_axis = canvas.x_axis.compute_index(x_st, width)
    y_axis = canvas.y_axis.compute_index(y_st, height)

    bases = create((height, width))
    extend(bases, source, x_st + y_st, x_range + y_range)

    return finalize(bases,
                    cuda=cuda,
                    coords=OrderedDict([(glyph.x_label, x_axis),
                                        (glyph.y_label, y_axis)]),
                    dims=[glyph.y_label, glyph.x_label])