import io

from nose.tools import istest, assert_equal
import funk

from mammoth import documents, results
from mammoth.docx.xmlparser import element as xml_element, text as xml_text
from mammoth.docx.document_xml import read_document_xml_element
from mammoth.docx.numbering_xml import Numbering
from mammoth.docx.relationships_xml import Relationships, Relationship


@istest
class ReadXmlElementTests(object):
    @istest
    def text_from_text_element_is_read(self):
        element = _text_element("Hello!")
        assert_equal(documents.Text("Hello!"), _read_and_get_document_xml_element(element))
    
    @istest
    def can_read_text_within_run(self):
        element = _run_element_with_text("Hello!")
        assert_equal(
            documents.run([documents.Text("Hello!")]),
            _read_and_get_document_xml_element(element)
        )
    
    @istest
    def can_read_text_within_paragraph(self):
        element = _paragraph_element_with_text("Hello!")
        assert_equal(
            documents.paragraph([documents.run([documents.Text("Hello!")])]),
            _read_and_get_document_xml_element(element)
        )
    
    @istest
    def can_read_text_within_document(self):
        element = _document_element_with_text("Hello!")
        assert_equal(
            documents.Document([documents.paragraph([documents.run([documents.Text("Hello!")])])]),
            _read_and_get_document_xml_element(element)
        )
        
    @istest
    def paragraph_has_no_style_if_it_has_no_properties(self):
        element = xml_element("w:p")
        assert_equal(None, _read_and_get_document_xml_element(element).style_name)
        
    @istest
    def paragraph_has_style_name_read_from_paragraph_properties_if_present(self):
        style_xml = xml_element("w:pStyle", {"w:val": "Heading1"})
        properties_xml = xml_element("w:pPr", {}, [style_xml])
        paragraph_xml = xml_element("w:p", {}, [properties_xml])
        paragraph = _read_and_get_document_xml_element(paragraph_xml)
        assert_equal("Heading1", paragraph.style_name)
        
    @istest
    def paragraph_has_no_numbering_if_it_has_no_numbering_properties(self):
        element = xml_element("w:p")
        assert_equal(None, _read_and_get_document_xml_element(element).numbering)
        
    @istest
    def paragraph_has_numbering_properties_from_paragraph_properties_if_present(self):
        numbering_properties_xml = xml_element("w:numPr", {}, [
            xml_element("w:ilvl", {"w:val": "1"}),
            xml_element("w:numId", {"w:val": "42"}),
        ])
        properties_xml = xml_element("w:pPr", {}, [numbering_properties_xml])
        paragraph_xml = xml_element("w:p", {}, [properties_xml])
        
        numbering = Numbering({"42": {"1": documents.NumberingLevel("1", True)}})
        paragraph = _read_and_get_document_xml_element(paragraph_xml, numbering=numbering)
        
        assert_equal("1", paragraph.numbering.level_index)
        assert_equal(True, paragraph.numbering.is_ordered)
    
    @istest
    def run_has_no_style_if_it_has_no_properties(self):
        element = xml_element("w:r")
        assert_equal(None, _read_and_get_document_xml_element(element).style_name)
        
    @istest
    def run_has_style_name_read_from_run_properties_if_present(self):
        style_xml = xml_element("w:rStyle", {"w:val": "Emphasis"})
        run = self._read_run_with_properties([style_xml])
        assert_equal("Emphasis", run.style_name)
        
    @istest
    def run_is_not_bold_if_bold_element_is_not_present(self):
        run = self._read_run_with_properties([])
        assert_equal(False, run.is_bold)
    
    @istest
    def run_is_bold_if_bold_element_is_present(self):
        run = self._read_run_with_properties([xml_element("w:b")])
        assert_equal(True, run.is_bold)
        
    @istest
    def run_is_not_italic_if_italic_element_is_not_present(self):
        run = self._read_run_with_properties([])
        assert_equal(False, run.is_italic)
    
    @istest
    def run_is_italic_if_italic_element_is_present(self):
        run = self._read_run_with_properties([xml_element("w:i")])
        assert_equal(True, run.is_italic)
    
    def _read_run_with_properties(self, properties):
        properties_xml = xml_element("w:rPr", {}, properties)
        run_xml = xml_element("w:r", {}, [properties_xml])
        return _read_and_get_document_xml_element(run_xml)


    @istest
    def can_read_tab_element(self):
        element = xml_element("w:tab")
        tab = _read_and_get_document_xml_element(element)
        assert_equal(documents.tab(), tab)
        
    @istest
    def children_of_w_ins_are_converted_normally(self):
        element = xml_element("w:p", {}, [
            xml_element("w:ins", {}, [
                xml_element("w:r")
            ])
        ])
        assert_equal(
            documents.paragraph([documents.run([])]),
            _read_and_get_document_xml_element(element)
        )
        
    @istest
    def hyperlink_is_read_if_it_has_a_relationship_id(self):
        relationships = Relationships({
            "r42": Relationship(target="http://example.com")
        })
        run_element = xml_element("w:r")
        element = xml_element("w:hyperlink", {"r:id": "r42"}, [run_element])
        assert_equal(
            documents.hyperlink("http://example.com", [documents.run([])]),
            _read_and_get_document_xml_element(element, relationships=relationships)
        )
        
    @istest
    def hyperlink_is_ignored_if_it_does_not_have_a_relationship_id(self):
        run_element = xml_element("w:r")
        element = xml_element("w:hyperlink", {}, [run_element])
        assert_equal(
            [documents.run([])],
            _read_and_get_document_xml_element(element)
        )
        
        
    @istest
    @funk.with_context
    def can_read_inline_pictures(self, context):
        drawing_element = _create_inline_image(
            relationship_id="rId5",
            description="It's a hat",
        )
        
        image_bytes = b"Not an image at all!"
        
        relationships = Relationships({
            "rId5": Relationship(target="media/hat.png")
        })
        
        docx_file = context.mock()
        funk.allows(docx_file).open("word/media/hat.png").returns(io.BytesIO(image_bytes))
        
        content_types = context.mock()
        funk.allows(content_types).find_content_type("word/media/hat.png").returns("image/png")
        
        image = _read_and_get_document_xml_element(
            drawing_element,
            content_types=content_types,
            relationships=relationships,
            docx_file=docx_file,
        )[0]
        assert_equal(documents.Image, type(image))
        assert_equal("It's a hat", image.alt_text)
        assert_equal("image/png", image.content_type)
        with image.open() as image_file:
            assert_equal(image_bytes, image_file.read())
        
    @istest
    @funk.with_context
    def can_read_anchored_pictures(self, context):
        drawing_element = _create_anchored_image(
            relationship_id="rId5",
            description="It's a hat",
        )
        
        image_bytes = b"Not an image at all!"
        
        relationships = Relationships({
            "rId5": Relationship(target="media/hat.png")
        })
        
        docx_file = context.mock()
        funk.allows(docx_file).open("word/media/hat.png").returns(io.BytesIO(image_bytes))
        
        content_types = context.mock()
        funk.allows(content_types).find_content_type("word/media/hat.png").returns("image/png")
        
        image = _read_and_get_document_xml_element(
            drawing_element,
            content_types=content_types,
            relationships=relationships,
            docx_file=docx_file,
        )[0]
        assert_equal(documents.Image, type(image))
        assert_equal("It's a hat", image.alt_text)
        assert_equal("image/png", image.content_type)
        with image.open() as image_file:
            assert_equal(image_bytes, image_file.read())
    
    @istest
    def ignored_elements_are_ignored_without_message(self):
        element = xml_element("w:bookmarkStart")
        result = read_document_xml_element(element)
        assert_equal(None, result.value)
        assert_equal([], result.messages)
    
    @istest
    def unrecognised_elements_emit_warning(self):
        element = xml_element("w:huh", {}, [])
        result = read_document_xml_element(element)
        expected_warning = results.warning("An unrecognised element was ignored: w:huh")
        assert_equal([expected_warning], result.messages)
    
    @istest
    def unrecognised_elements_are_ignored(self):
        element = xml_element("w:huh", {}, [])
        assert_equal(None, read_document_xml_element(element).value)
    
    @istest
    def unrecognised_children_are_ignored(self):
        element = xml_element("w:r", {}, [_text_element("Hello!"), xml_element("w:huh", {}, [])])
        assert_equal(
            documents.run([documents.Text("Hello!")]),
            read_document_xml_element(element).value
        )

def _read_and_get_document_xml_element(*args, **kwargs):
    result = read_document_xml_element(*args, **kwargs)
    assert_equal([], result.messages)
    return result.value


def _document_element_with_text(text):
    return xml_element("w:document", {}, [
        xml_element("w:body", {}, [_paragraph_element_with_text(text)])
    ])


def _paragraph_element_with_text(text):
    return xml_element("w:p", {}, [_run_element_with_text(text)])


def _run_element_with_text(text):
    return xml_element("w:r", {}, [_text_element(text)])


def _text_element(value):
    return xml_element("w:t", {}, [xml_text(value)])
    

def _create_inline_image(description, relationship_id):
    return xml_element("w:drawing", {}, [
        xml_element("wp:inline", {}, _create_image_elements(description, relationship_id))
    ])


def _create_anchored_image(description, relationship_id):
    return xml_element("w:drawing", {}, [
        xml_element("wp:anchor", {}, _create_image_elements(description, relationship_id))
    ])

    
def _create_image_elements(description, relationship_id):
    return [
        xml_element("wp:docPr", {"descr": description}),
        xml_element("a:graphic", {}, [
            xml_element("a:graphicData", {}, [
                xml_element("pic:pic", {}, [
                    xml_element("pic:blipFill", {}, [
                        xml_element("a:blip", {"r:embed": relationship_id})
                    ])
                ])
            ])
        ])
    ]