###############################################################################
#
# Vml - A class for writing the Excel XLSX Vml file.
#
# Copyright 2013-2016, John McNamara, jmcnamara@cpan.org
#

# Package imports.
from . import xmlwriter


class Vml(xmlwriter.XMLwriter):
    """
    A class for writing the Excel XLSX Vml file.


    """

    ###########################################################################
    #
    # Public API.
    #
    ###########################################################################

    def __init__(self):
        """
        Constructor.

        """

        super(Vml, self).__init__()

    ###########################################################################
    #
    # Private API.
    #
    ###########################################################################
    def _assemble_xml_file(self, data_id, vml_shape_id, comments_data=None,
                           buttons_data=None, header_images_data=None):
        # Assemble and write the XML file.
        z_index = 1

        self._write_xml_namespace()

        # Write the o:shapelayout element.
        self._write_shapelayout(data_id)

        if buttons_data:
            # Write the v:shapetype element.
            self._write_button_shapetype()

            for button in buttons_data:
                # Write the v:shape element.
                vml_shape_id += 1
                self._write_button_shape(vml_shape_id, z_index, button)
                z_index += 1

        if comments_data:
            # Write the v:shapetype element.
            self._write_comment_shapetype()

            for comment in comments_data:
                # Write the v:shape element.
                vml_shape_id += 1
                self._write_comment_shape(vml_shape_id, z_index, comment)
                z_index += 1

        if header_images_data:

            # Write the v:shapetype element.
            self._write_image_shapetype()

            index = 1
            for image in header_images_data:
                # Write the v:shape element.
                vml_shape_id += 1
                self._write_image_shape(vml_shape_id, index, image)
                index += 1

        self._xml_end_tag('xml')

        # Close the XML writer filehandle.
        self._xml_close()

    def _pixels_to_points(self, vertices):
        # Convert comment vertices from pixels to points.

        left, top, width, height = vertices[8:12]

        # Scale to pixels.
        left *= 0.75
        top *= 0.75
        width *= 0.75
        height *= 0.75

        return left, top, width, height

    ###########################################################################
    #
    # XML methods.
    #
    ###########################################################################
    def _write_xml_namespace(self):
        # Write the <xml> element. This is the root element of VML.
        schema = 'urn:schemas-microsoft-com:'
        xmlns = schema + 'vml'
        xmlns_o = schema + 'office:office'
        xmlns_x = schema + 'office:excel'

        attributes = [
            ('xmlns:v', xmlns),
            ('xmlns:o', xmlns_o),
            ('xmlns:x', xmlns_x),
        ]

        self._xml_start_tag('xml', attributes)

    def _write_shapelayout(self, data_id):
        # Write the <o:shapelayout> element.
        attributes = [('v:ext', 'edit')]

        self._xml_start_tag('o:shapelayout', attributes)

        # Write the o:idmap element.
        self._write_idmap(data_id)

        self._xml_end_tag('o:shapelayout')

    def _write_idmap(self, data_id):
        # Write the <o:idmap> element.
        attributes = [
            ('v:ext', 'edit'),
            ('data', data_id),
        ]

        self._xml_empty_tag('o:idmap', attributes)

    def _write_comment_shapetype(self):
        # Write the <v:shapetype> element.
        shape_id = '_x0000_t202'
        coordsize = '21600,21600'
        spt = 202
        path = 'm,l,21600r21600,l21600,xe'

        attributes = [
            ('id', shape_id),
            ('coordsize', coordsize),
            ('o:spt', spt),
            ('path', path),
        ]

        self._xml_start_tag('v:shapetype', attributes)

        # Write the v:stroke element.
        self._write_stroke()

        # Write the v:path element.
        self._write_comment_path('t', 'rect')

        self._xml_end_tag('v:shapetype')

    def _write_button_shapetype(self):
        # Write the <v:shapetype> element.
        shape_id = '_x0000_t201'
        coordsize = '21600,21600'
        spt = 201
        path = 'm,l,21600r21600,l21600,xe'

        attributes = [
            ('id', shape_id),
            ('coordsize', coordsize),
            ('o:spt', spt),
            ('path', path),
        ]

        self._xml_start_tag('v:shapetype', attributes)

        # Write the v:stroke element.
        self._write_stroke()

        # Write the v:path element.
        self._write_button_path()

        # Write the o:lock element.
        self._write_shapetype_lock()

        self._xml_end_tag('v:shapetype')

    def _write_image_shapetype(self):
        # Write the <v:shapetype> element.
        shape_id = '_x0000_t75'
        coordsize = '21600,21600'
        spt = 75
        o_preferrelative = 't'
        path = 'm@4@5l@4@11@9@11@9@5xe'
        filled = 'f'
        stroked = 'f'

        attributes = [
            ('id', shape_id),
            ('coordsize', coordsize),
            ('o:spt', spt),
            ('o:preferrelative', o_preferrelative),
            ('path', path),
            ('filled', filled),
            ('stroked', stroked),
        ]

        self._xml_start_tag('v:shapetype', attributes)

        # Write the v:stroke element.
        self._write_stroke()

        # Write the v:formulas element.
        self._write_formulas()

        # Write the v:path element.
        self._write_image_path()

        # Write the o:lock element.
        self._write_aspect_ratio_lock()

        self._xml_end_tag('v:shapetype')

    def _write_stroke(self):
        # Write the <v:stroke> element.
        joinstyle = 'miter'

        attributes = [('joinstyle', joinstyle)]

        self._xml_empty_tag('v:stroke', attributes)

    def _write_comment_path(self, gradientshapeok, connecttype):
        # Write the <v:path> element.
        attributes = []

        if gradientshapeok:
            attributes.append(('gradientshapeok', 't'))

        attributes.append(('o:connecttype', connecttype))

        self._xml_empty_tag('v:path', attributes)

    def _write_button_path(self):
        # Write the <v:path> element.
        shadowok = 'f'
        extrusionok = 'f'
        strokeok = 'f'
        fillok = 'f'
        connecttype = 'rect'

        attributes = [
            ('shadowok', shadowok),
            ('o:extrusionok', extrusionok),
            ('strokeok', strokeok),
            ('fillok', fillok),
            ('o:connecttype', connecttype),
        ]

        self._xml_empty_tag('v:path', attributes)

    def _write_image_path(self):
        # Write the <v:path> element.
        extrusionok = 'f'
        gradientshapeok = 't'
        connecttype = 'rect'

        attributes = [
            ('o:extrusionok', extrusionok),
            ('gradientshapeok', gradientshapeok),
            ('o:connecttype', connecttype),
        ]

        self._xml_empty_tag('v:path', attributes)

    def _write_shapetype_lock(self):
        # Write the <o:lock> element.
        ext = 'edit'
        shapetype = 't'

        attributes = [
            ('v:ext', ext),
            ('shapetype', shapetype),
        ]

        self._xml_empty_tag('o:lock', attributes)

    def _write_rotation_lock(self):
        # Write the <o:lock> element.
        ext = 'edit'
        rotation = 't'

        attributes = [
            ('v:ext', ext),
            ('rotation', rotation),
        ]

        self._xml_empty_tag('o:lock', attributes)

    def _write_aspect_ratio_lock(self):
        # Write the <o:lock> element.
        ext = 'edit'
        aspectratio = 't'

        attributes = [
            ('v:ext', ext),
            ('aspectratio', aspectratio),
        ]

        self._xml_empty_tag('o:lock', attributes)

    def _write_comment_shape(self, shape_id, z_index, comment):
        # Write the <v:shape> element.
        shape_type = '#_x0000_t202'
        insetmode = 'auto'
        visibility = 'hidden'

        # Set the shape index.
        shape_id = '_x0000_s' + str(shape_id)

        # Get the comment parameters
        row = comment[0]
        col = comment[1]
        visible = comment[4]
        fillcolor = comment[5]
        vertices = comment[6]

        (left, top, width, height) = self._pixels_to_points(vertices)

        # Set the visibility.
        if visible:
            visibility = 'visible'

        style = (
            'position:absolute;'
            'margin-left:%.15gpt;'
            'margin-top:%.15gpt;'
            'width:%.15gpt;'
            'height:%.15gpt;'
            'z-index:%d;'
            'visibility:%s' % (left, top, width, height, z_index, visibility))

        attributes = [
            ('id', shape_id),
            ('type', shape_type),
            ('style', style),
            ('fillcolor', fillcolor),
            ('o:insetmode', insetmode),
        ]

        self._xml_start_tag('v:shape', attributes)

        # Write the v:fill element.
        self._write_comment_fill()

        # Write the v:shadow element.
        self._write_shadow()

        # Write the v:path element.
        self._write_comment_path(None, 'none')

        # Write the v:textbox element.
        self._write_comment_textbox()

        # Write the x:ClientData element.
        self._write_comment_client_data(row, col, visible, vertices)

        self._xml_end_tag('v:shape')

    def _write_button_shape(self, shape_id, z_index, button):
        # Write the <v:shape> element.
        shape_type = '#_x0000_t201'

        # Set the shape index.
        shape_id = '_x0000_s' + str(shape_id)

        # Get the button parameters.
        # row = button["_row"]
        # col = button["_col"]
        vertices = button["vertices"]

        (left, top, width, height) = self._pixels_to_points(vertices)

        style = (
            'position:absolute;'
            'margin-left:%.15gpt;'
            'margin-top:%.15gpt;'
            'width:%.15gpt;'
            'height:%.15gpt;'
            'z-index:%d;'
            'mso-wrap-style:tight' % (left, top, width, height, z_index))

        attributes = [
            ('id', shape_id),
            ('type', shape_type),
            ('style', style),
            ('o:button', 't'),
            ('fillcolor', 'buttonFace [67]'),
            ('strokecolor', 'windowText [64]'),
            ('o:insetmode', 'auto'),
        ]

        self._xml_start_tag('v:shape', attributes)

        # Write the v:fill element.
        self._write_button_fill()

        # Write the o:lock element.
        self._write_rotation_lock()

        # Write the v:textbox element.
        self._write_button_textbox(button["font"])

        # Write the x:ClientData element.
        self._write_button_client_data(button)

        self._xml_end_tag('v:shape')

    def _write_image_shape(self, shape_id, z_index, image_data):
        # Write the <v:shape> element.
        shape_type = '#_x0000_t75'

        # Set the shape index.
        shape_id = '_x0000_s' + str(shape_id)

        # Get the image parameters
        width = image_data[0]
        height = image_data[1]
        name = image_data[2]
        position = image_data[3]
        x_dpi = image_data[4]
        y_dpi = image_data[5]

        # Scale the height/width by the resolution, relative to 72dpi.
        width = width * 72.0 / x_dpi
        height = height * 72.0 / y_dpi

        # Excel uses a rounding based around 72 and 96 dpi.
        width = 72.0 / 96 * int(width * 96.0 / 72 + 0.25)
        height = 72.0 / 96 * int(height * 96.0 / 72 + 0.25)

        style = (
            'position:absolute;'
            'margin-left:0;'
            'margin-top:0;'
            'width:%.15gpt;'
            'height:%.15gpt;'
            'z-index:%d' % (width, height, z_index))

        attributes = [
            ('id', position),
            ('o:spid', shape_id),
            ('type', shape_type),
            ('style', style),
        ]

        self._xml_start_tag('v:shape', attributes)

        # Write the v:imagedata element.
        self._write_imagedata(z_index, name)

        # Write the o:lock element.
        self._write_rotation_lock()

        self._xml_end_tag('v:shape')

    def _write_comment_fill(self):
        # Write the <v:fill> element.
        color_2 = '#ffffe1'

        attributes = [('color2', color_2)]

        self._xml_empty_tag('v:fill', attributes)

    def _write_button_fill(self):
        # Write the <v:fill> element.
        color_2 = 'buttonFace [67]'
        detectmouseclick = 't'

        attributes = [
            ('color2', color_2),
            ('o:detectmouseclick', detectmouseclick),
        ]

        self._xml_empty_tag('v:fill', attributes)

    def _write_shadow(self):
        # Write the <v:shadow> element.
        on = 't'
        color = 'black'
        obscured = 't'

        attributes = [
            ('on', on),
            ('color', color),
            ('obscured', obscured),
        ]

        self._xml_empty_tag('v:shadow', attributes)

    def _write_comment_textbox(self):
        # Write the <v:textbox> element.
        style = 'mso-direction-alt:auto'

        attributes = [('style', style)]

        self._xml_start_tag('v:textbox', attributes)

        # Write the div element.
        self._write_div('left')

        self._xml_end_tag('v:textbox')

    def _write_button_textbox(self, font):
        # Write the <v:textbox> element.
        style = 'mso-direction-alt:auto'

        attributes = [('style', style), ('o:singleclick', 'f')]

        self._xml_start_tag('v:textbox', attributes)

        # Write the div element.
        self._write_div('center', font)

        self._xml_end_tag('v:textbox')

    def _write_div(self, align, font=None):
        # Write the <div> element.

        style = 'text-align:' + align

        attributes = [('style', style)]

        self._xml_start_tag('div', attributes)

        if font:
            # Write the font element.
            self._write_font(font)

        self._xml_end_tag('div')

    def _write_font(self, font):
        # Write the <font> element.
        caption = font["caption"]
        face = 'Calibri'
        size = 220
        color = '#000000'

        attributes = [
            ('face', face),
            ('size', size),
            ('color', color),
        ]

        self._xml_data_element('font', caption, attributes)

    def _write_comment_client_data(self, row, col, visible, vertices):
        # Write the <x:ClientData> element.
        object_type = 'Note'

        attributes = [('ObjectType', object_type)]

        self._xml_start_tag('x:ClientData', attributes)

        # Write the x:MoveWithCells element.
        self._write_move_with_cells()

        # Write the x:SizeWithCells element.
        self._write_size_with_cells()

        # Write the x:Anchor element.
        self._write_anchor(vertices)

        # Write the x:AutoFill element.
        self._write_auto_fill()

        # Write the x:Row element.
        self._write_row(row)

        # Write the x:Column element.
        self._write_column(col)

        # Write the x:Visible element.
        if visible:
            self._write_visible()

        self._xml_end_tag('x:ClientData')

    def _write_button_client_data(self, button):
        # Write the <x:ClientData> element.
        macro = button["macro"]
        vertices = button["vertices"]

        object_type = 'Button'

        attributes = [('ObjectType', object_type)]

        self._xml_start_tag('x:ClientData', attributes)

        # Write the x:Anchor element.
        self._write_anchor(vertices)

        # Write the x:PrintObject element.
        self._write_print_object()

        # Write the x:AutoFill element.
        self._write_auto_fill()

        # Write the x:FmlaMacro element.
        self._write_fmla_macro(macro)

        # Write the x:TextHAlign element.
        self._write_text_halign()

        # Write the x:TextVAlign element.
        self._write_text_valign()

        self._xml_end_tag('x:ClientData')

    def _write_move_with_cells(self):
        # Write the <x:MoveWithCells> element.
        self._xml_empty_tag('x:MoveWithCells')

    def _write_size_with_cells(self):
        # Write the <x:SizeWithCells> element.
        self._xml_empty_tag('x:SizeWithCells')

    def _write_visible(self):
        # Write the <x:Visible> element.
        self._xml_empty_tag('x:Visible')

    def _write_anchor(self, vertices):
        # Write the <x:Anchor> element.
        (col_start, row_start, x1, y1, col_end, row_end, x2, y2) = vertices[:8]

        strings = [col_start, x1, row_start, y1, col_end, x2, row_end, y2]
        strings = [str(i) for i in strings]

        data = ", ".join(strings)

        self._xml_data_element('x:Anchor', data)

    def _write_auto_fill(self):
        # Write the <x:AutoFill> element.
        data = 'False'

        self._xml_data_element('x:AutoFill', data)

    def _write_row(self, data):
        # Write the <x:Row> element.
        self._xml_data_element('x:Row', data)

    def _write_column(self, data):
        # Write the <x:Column> element.
        self._xml_data_element('x:Column', data)

    def _write_print_object(self):
        # Write the <x:PrintObject> element.
        self._xml_data_element('x:PrintObject', 'False')

    def _write_text_halign(self):
        # Write the <x:TextHAlign> element.
        self._xml_data_element('x:TextHAlign', 'Center')

    def _write_text_valign(self):
        # Write the <x:TextVAlign> element.
        self._xml_data_element('x:TextVAlign', 'Center')

    def _write_fmla_macro(self, data):
        # Write the <x:FmlaMacro> element.
        self._xml_data_element('x:FmlaMacro', data)

    def _write_imagedata(self, image_index, o_title):
        # Write the <v:imagedata> element.
        attributes = [
            ('o:relid', 'rId' + str(image_index)),
            ('o:title', o_title),
        ]

        self._xml_empty_tag('v:imagedata', attributes)

    def _write_formulas(self):
        # Write the <v:formulas> element.
        self._xml_start_tag('v:formulas')

        # Write the v:f elements.
        self._write_formula('if lineDrawn pixelLineWidth 0')
        self._write_formula('sum @0 1 0')
        self._write_formula('sum 0 0 @1')
        self._write_formula('prod @2 1 2')
        self._write_formula('prod @3 21600 pixelWidth')
        self._write_formula('prod @3 21600 pixelHeight')
        self._write_formula('sum @0 0 1')
        self._write_formula('prod @6 1 2')
        self._write_formula('prod @7 21600 pixelWidth')
        self._write_formula('sum @8 21600 0')
        self._write_formula('prod @7 21600 pixelHeight')
        self._write_formula('sum @10 21600 0')

        self._xml_end_tag('v:formulas')

    def _write_formula(self, eqn):
        # Write the <v:f> element.
        attributes = [('eqn', eqn)]

        self._xml_empty_tag('v:f', attributes)
