#!/usr/bin/env python3

import easymacro as app


ID_EXTENSION = ''
TITLE = 'ZAZ Latex2SVG'
_ = None
TEMPLATE = """\documentclass{{article}}
\\usepackage[a5paper, landscape]{{geometry}}
\\usepackage{{xcolor}}
\\usepackage{{amssymb}}
\\usepackage{{amsmath}}
\pagestyle{{empty}}
\\begin{{document}}
\\begingroup
\Huge

\[ {} \]

\endgroup
\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 validate_app():
    msg1 = _('Not found')
    msg2 = _('Found')

    result = msg1
    if app.paths.exists_app('pdflatex'):
        result = msg2
    msg = f'pdflatex = {result}\n'

    result = msg1
    if app.paths.exists_app('pdfcrop'):
        result = msg2
    msg += f'pdfcrop = {result}\n'

    result = msg1
    if app.paths.exists_app('pdf2svg'):
        result = msg2
    msg += f'pdf2svg = {result}\n\n'

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

    app.msgbox(msg)
    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


def from_selection():
    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 _create_dialog():
    args = {
        'Name': 'dialog',
        'Title': TITLE,
        'Width': 270,
        'Height': 260,
    }
    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': 20,
        'ImageURL': 'preview.svg',
        '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': 20,
        'ImageURL': 'insert.svg',
        'ImagePosition': 1,
    }
    dlg.add_control(args)
    args = {
        'Type': 'Button',
        'Name': 'cmd_close',
        'Label': _('Close'),
        'Width': 70,
        'Height': 20,
        'ImageURL': 'close.svg',
        '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


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


def run(args, path_locales):
    global _
    _ = app.install_locales(path_locales)
    globals()[args]()
    return