import os

import yaml
from pptx import Presentation
from pptx.util import Inches
from pptx.enum.shapes import MSO_SHAPE


def read_configuration(config_file):
    with open(config_file) as f:
        cfg = yaml.load(f)

    return cfg


def generate_presentation():
    cfg = read_configuration(
        os.getenv('CONFIGURATION_FILENAME', 'presentation.yml'))

    prs = Presentation()
    title_slide = prs.slide_layouts[0]

    slide = prs.slides.add_slide(title_slide)
    title = slide.shapes.title
    title.text = cfg['title_page']['title']

    prs.save(os.getenv('PRESENTATION_NAME', 'devops-for-powerpoint.pptx'))


def layout_handler(layout_name, presentation_object):
    for layout in presentation_object.slide_layouts:
        if layout.name == layout_name:
            return layout


def generate_slides():
    cfg = read_configuration(
        os.getenv('CONFIGURATION_FILENAME', 'presentation.yml'))
    prs = Presentation()

    for i in sorted(cfg):
        slide = prs.slides.add_slide(
            layout_handler(cfg[i]['slide_layout'], prs))
        title = slide.shapes.title
        title.text = cfg[i]['title']

        if 'content' in cfg[i]:
            content = slide.placeholders[1]
            content.text = cfg[i]['content']

        if 'position' in cfg[i]:
            shapes = slide.shapes
            left = Inches(cfg[i]['position']['left'])
            top = Inches(cfg[i]['position']['top'])
            width = Inches(cfg[i]['position']['width'])
            height = Inches(cfg[i]['position']['height'])

            shape = shapes.add_shape(
                MSO_SHAPE.CHEVRON, left, top, width, height)
            left = left + width - Inches(0.4)
            width = Inches(2.0)

            for n in range(2, 6):
                shape = shapes.add_shape(
                    MSO_SHAPE.CHEVRON, left, top, width, height)
                shape.text = 'Step yo: %d' % n
                left = left + width - Inches(0.4)

    prs.save(os.getenv('PRESENTATION_NAME', 'devops-for-powerpoint.pptx'))


if __name__ == '__main__':
    # generate_presentation()
    generate_slides()