import os
import pathlib

import pptx
import pytest

from unstructured.documents.elements import (
    ListItem,
    NarrativeText,
    PageBreak,
    Text,
    Title,
)
from unstructured.partition.pptx import partition_pptx

DIRECTORY = pathlib.Path(__file__).parent.resolve()
EXAMPLE_DOCS_DIRECTORY = os.path.join(DIRECTORY, "..", "..", "example-docs")

EXPECTED_PPTX_OUTPUT = [
    Title(text="Adding a Bullet Slide"),
    ListItem(text="Find the bullet slide layout"),
    ListItem(text="Use _TextFrame.text for first bullet"),
    ListItem(text="Use _TextFrame.add_paragraph() for subsequent bullets"),
    NarrativeText(text="Here is a lot of text!"),
    NarrativeText(text="Here is some text in a text box!"),
]


def test_partition_pptx_from_filename():
    filename = os.path.join(EXAMPLE_DOCS_DIRECTORY, "fake-power-point.pptx")
    elements = partition_pptx(filename=filename)
    assert elements == EXPECTED_PPTX_OUTPUT


def test_partition_pptx_from_file():
    filename = os.path.join(EXAMPLE_DOCS_DIRECTORY, "fake-power-point.pptx")
    with open(filename, "rb") as f:
        elements = partition_pptx(file=f)
    assert elements == EXPECTED_PPTX_OUTPUT


def test_partition_pptx_raises_with_both_specified():
    filename = os.path.join(EXAMPLE_DOCS_DIRECTORY, "fake-power-point.pptx")
    with open(filename, "rb") as f, pytest.raises(ValueError):
        partition_pptx(filename=filename, file=f)


def test_partition_pptx_raises_with_neither():
    with pytest.raises(ValueError):
        partition_pptx()


def test_partition_pptx_adds_page_breaks(tmpdir):
    filename = os.path.join(tmpdir, "test-page-breaks.pptx")

    presentation = pptx.Presentation()
    blank_slide_layout = presentation.slide_layouts[6]

    slide = presentation.slides.add_slide(blank_slide_layout)
    left = top = width = height = pptx.util.Inches(2)
    txBox = slide.shapes.add_textbox(left, top, width, height)
    tf = txBox.text_frame
    tf.text = "This is the first slide."

    slide = presentation.slides.add_slide(blank_slide_layout)
    left = top = width = height = pptx.util.Inches(2)
    txBox = slide.shapes.add_textbox(left, top, width, height)
    tf = txBox.text_frame
    tf.text = "This is the second slide."

    presentation.save(filename)

    elements = partition_pptx(filename=filename)

    assert elements == [
        NarrativeText(text="This is the first slide."),
        PageBreak(),
        NarrativeText(text="This is the second slide."),
    ]


def test_partition_pptx_page_breaks_toggle_off(tmpdir):
    filename = os.path.join(tmpdir, "test-page-breaks.pptx")

    presentation = pptx.Presentation()
    blank_slide_layout = presentation.slide_layouts[6]

    slide = presentation.slides.add_slide(blank_slide_layout)
    left = top = width = height = pptx.util.Inches(2)
    txBox = slide.shapes.add_textbox(left, top, width, height)
    tf = txBox.text_frame
    tf.text = "This is the first slide."

    slide = presentation.slides.add_slide(blank_slide_layout)
    left = top = width = height = pptx.util.Inches(2)
    txBox = slide.shapes.add_textbox(left, top, width, height)
    tf = txBox.text_frame
    tf.text = "This is the second slide."

    presentation.save(filename)

    elements = partition_pptx(filename=filename, include_page_breaks=False)

    assert elements == [
        NarrativeText(text="This is the first slide."),
        NarrativeText(text="This is the second slide."),
    ]


def test_partition_pptx_orders_elements(tmpdir):
    filename = os.path.join(tmpdir, "test-ordering.pptx")

    presentation = pptx.Presentation()
    blank_slide_layout = presentation.slide_layouts[6]
    slide = presentation.slides.add_slide(blank_slide_layout)

    left = top = width = height = pptx.util.Inches(2)
    txBox = slide.shapes.add_textbox(left, top, width, height)
    tf = txBox.text_frame
    tf.text = "This is lower and should come second"

    left = top = width = height = pptx.util.Inches(1)
    left = top = pptx.util.Inches(-10)
    txBox = slide.shapes.add_textbox(left, top, width, height)
    tf = txBox.text_frame
    tf.text = "This is off the page and shouldn't appear"

    left = top = width = height = pptx.util.Inches(2)
    txBox = slide.shapes.add_textbox(left, top, width, height)
    tf = txBox.text_frame
    tf.text = ""

    left = top = width = height = pptx.util.Inches(1)
    txBox = slide.shapes.add_textbox(left, top, width, height)
    tf = txBox.text_frame
    tf.text = "This is higher and should come first"

    top = width = height = pptx.util.Inches(1)
    left = pptx.util.Inches(0.5)
    txBox = slide.shapes.add_textbox(left, top, width, height)
    tf = txBox.text_frame
    tf.text = "-------------TOP-------------"

    presentation.save(filename)

    elements = partition_pptx(filename=filename)
    assert elements == [
        Text("-------------TOP-------------"),
        NarrativeText("This is higher and should come first"),
        NarrativeText("This is lower and should come second"),
    ]