import uno
import unohelper
from com.sun.star.task import XJobExecutor
import easymacro as app


ID_EXTENSION = 'net.elmau.zaz.latex2svg'
SERVICE = ('com.sun.star.task.Job',)
TITLE = 'ZAZ Latex2SVG'


_ = app.install_locales(__file__)


TEMPLATE = """\documentclass{{article}}
\\usepackage[a5paper, landscape]{{geometry}}
\\usepackage{{xcolor}}
\\usepackage{{amssymb}}
\\usepackage{{amsmath}}
\pagestyle{{empty}}
\\begin{{document}}
\\begingroup
\Huge

\[ {} \]

\endgroup
\end{{document}}
"""
# ~ TEMPLATE = """\documentclass{{standalone}}
# ~ \\usepackage[a5paper, landscape]{{geometry}}
# ~ \\usepackage{{xcolor}}
# ~ \\usepackage{{amssymb}}
# ~ \\usepackage{{amsmath}}
# ~ \\usepackage{{tikz}}
# ~ \pagestyle{{empty}}
# ~ \\begin{{document}}
# ~ \\begin{{tikzpicture}}

# ~ \\node at (0, 0) {{
    # ~ \\begin{{equation*}}

# ~ \[ {} \]

    # ~ \end{{equation*}}
# ~ }};

# ~ \end{{tikzpicture}}
# ~ \end{{document}}
# ~ """


class Controllers(object):

    def __init__(self, dlg):
        self.d = dlg
        self._path = ''

    def cmd_close_action(self, event):
        self.d.close()
        return

    def cmd_preview_action(self, event):
        code = self.d.text.value
        if not code:
            msg = _('Write some code')
            app.errorbox(msg)
            return

        self._path = _latex_to_svg(code)
        self.d.image.url = self._path
        return

    def cmd_insert_action(self, event):
        if not self._path:
            msg = _('First, generate preview')
            app.errorbox(msg)
            return

        attr = {}
        sel = app.selection
        if hasattr(sel, 'anchor'):
            attr = sel.size
            anchor = sel.anchor
            anchor.dp.remove(sel)
            sel = anchor

        image = sel.insert_image(self._path, attr)
        image.description = self.d.text.value
        self.d.close()
        return


def _latex_to_svg(code):
    NAME = 'temp'
    data = TEMPLATE.format(code)
    dt = app.paths.dir_tmp()
    path_tex = app._P.join(dt.name, f'{NAME}.tex')
    path_pdf = app._P.join(dt.name, f'{NAME}.pdf')
    path_svg = app._P.join(app._P.temp_dir, f'{NAME}.svg')

    app.paths.save(path_tex, data)
    cmd = f'pdflatex --interaction=batchmode -output-directory="{dt.name}" "{path_tex}"'
    app.run(cmd)
    cmd = f'pdfcrop "{path_pdf}" "{path_pdf}"'
    app.run(cmd)
    cmd = f'pdf2svg "{path_pdf}" "{path_svg}"'
    app.run(cmd)

    if not app.paths.exists(path_svg):
        path_svg = ''
    dt.cleanup()
    return path_svg


class ZAZLaTex2SVG(unohelper.Base, XJobExecutor):
    NAME = 'temp'
    _msg1 = _('Not found')
    _msg2 = _('Found')

    def __init__(self, ctx):
        self.ctx = ctx

    def trigger(self, args=''):
        if args == 'app':
            self._app()
            return

        if args == 'dlg':
            self._dlg()
            return

        self._from_selection()
        return

    def _app(self):
        result = self._msg1
        if app.paths.exists_app('pdflatex'):
            result = self._msg2
        msg = f'pdflatex = {result}\n'

        result = self._msg1
        if app.paths.exists_app('pdfcrop'):
            result = self._msg2
        msg += f'pdfcrop = {result}\n'

        result = self._msg1
        if app.paths.exists_app('pdf2svg'):
            result = self._msg2
        msg += f'pdf2svg = {result}\n\n'

        msg += _('Not used, if not found some application.')

        app.msgbox(msg)
        return

    def _from_selection(self):
        doc = app.active
        sel = doc.selection

        data = sel.value
        path_svg = _latex_to_svg(data)

        sel = sel.offset()
        args = {}
        if doc.type == 'writer':
            args = {'Width': 5000, 'Height': 2000}
        image = sel.insert_image(path_svg, args)
        image.description = data
        return

    def _dlg(self):
        dlg = self._create_dialog()
        sel = app.selection
        if hasattr(sel, 'description'):
            dlg.text.value = sel.description
        dlg.open()
        return

    def _create_dialog(self):
        args = {
            'Name': 'dialog',
            'Title': TITLE,
            'Width': 270,
            'Height': 250,
        }
        dlg = app.create_dialog(args)
        dlg.id = ID_EXTENSION
        dlg.events = Controllers

        args = {
            'Type': 'Label',
            'Name': 'lbl_code',
            'Label': _('Latex code'),
            'Width': 70,
            'Height': 10,
            'X': 10,
            'Y': 5,
            'VerticalAlign': 1,
        }
        dlg.add_control(args)

        args = {
            'Type': 'Text',
            'Name': 'text',
            'Width': 250,
            'Height': 75,
            'MultiLine': True,
            'VScroll': True,
        }
        dlg.add_control(args)

        args = {
            'Type': 'Button',
            'Name': 'cmd_preview',
            'Label': _('Preview'),
            'Width': 70,
            'Height': 15,
            'ImageURL': 'view.png',
            'ImagePosition': 1,
        }
        dlg.add_control(args)

        args = {
            'Type': 'Image',
            'Name': 'image',
            'Width': 250,
            'Height': 100,
        }
        dlg.add_control(args)

        args = {
            'Type': 'Button',
            'Name': 'cmd_insert',
            'Label': _('Insert'),
            'Width': 70,
            'Height': 15,
            'ImageURL': 'insert.png',
            'ImagePosition': 1,
        }
        dlg.add_control(args)
        args = {
            'Type': 'Button',
            'Name': 'cmd_close',
            'Label': _('Close'),
            'Width': 70,
            'Height': 15,
            'ImageURL': 'close.png',
            'ImagePosition': 1,
        }
        dlg.add_control(args)

        dlg.text.move(dlg.lbl_code)
        dlg.cmd_preview.move(dlg.text, center=True)
        dlg.image.move(dlg.cmd_preview, center=True)
        dlg.cmd_insert.move(dlg.image)
        dlg.cmd_close.move(dlg.image)
        controls = (dlg.cmd_insert, dlg.cmd_close)
        dlg.center(controls)

        return dlg


g_ImplementationHelper = unohelper.ImplementationHelper()
g_ImplementationHelper.addImplementation(ZAZLaTex2SVG, ID_EXTENSION, SERVICE)