#  Copyright (c) 2003-2004 The Regents of the University of California.
#  Copyright (c) 2005 Gavin E. Crooks
#  Copyright (c) 2006-2015, The Regents of the University of California, through
#  Lawrence Berkeley National Laboratory (subject to receipt of any required
#  approvals from the U.S. Dept. of Energy).  All rights reserved.

#  This software is distributed under the new BSD Open Source License.
#  <http://www.opensource.org/licenses/bsd-license.html>
#
#  Redistribution and use in source and binary forms, with or without
#  modification, are permitted provided that the following conditions are met:
#
#  (1) Redistributions of source code must retain the above copyright notice,
#  this list of conditions and the following disclaimer.
#
#  (2) Redistributions in binary form must reproduce the above copyright
#  notice, this list of conditions and the following disclaimer in the
#  documentation and or other materials provided with the distribution.
#
#  (3) Neither the name of the University of California, Lawrence Berkeley
#  National Laboratory, U.S. Dept. of Energy nor the names of its contributors
#  may be used to endorse or promote products derived from this software
#  without specific prior written permission.
#
#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
#  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
#  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
#  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
#  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
#  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
#  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
#  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
#  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
#  POSSIBILITY OF SUCH DAMAGE.

import cgi as cgilib
import cgitb
import os.path
import sys
import shutil
from io import StringIO, BytesIO, TextIOWrapper


import weblogo

from string import Template

from weblogo.colorscheme import ColorScheme, SymbolColor


cgitb.enable()


# TODO: Check units

# TODO: In WebLogo2: why slash create.cgi? I think this was a workaround
# for some browser quirk
# <form method="post" action="/create.cgi" enctype="multipart/form-data">


# Should replace with weblogo.utils?
def resource_string(resource, basefilename):
    import os
    fn = os.path.join(os.path.dirname(basefilename), resource)
    return open(fn).read()


mime_type = {
    'eps': 'application/postscript',
    'pdf': 'application/pdf',
    'svg': 'image/svg+xml',
    'png': 'image/png',
    'png_print': 'image/png',
    'logodata': 'text/plain',
    'jpeg': 'image/jpeg',
}

extension = {
    'eps': 'eps',
    'pdf': 'pdf',
    'png': 'png',
    'svg': 'svg',
    'png_print': 'png',
    'logodata': 'txt',
    'jpeg': 'jpeg'
}

alphabets = {
    'alphabet_auto': None,
    'alphabet_protein': weblogo.unambiguous_protein_alphabet,
    'alphabet_rna': weblogo.unambiguous_rna_alphabet,
    'alphabet_dna': weblogo.unambiguous_dna_alphabet}

color_schemes = {}
for k in weblogo.std_color_schemes.keys():
    color_schemes['color_' + k.replace(' ', '_')] = weblogo.std_color_schemes[k]

composition = {'comp_none': 'none',
               'comp_auto': 'auto',
               'comp_equiprobable': 'equiprobable',
               'comp_CG': 'percentCG',
               'comp_Celegans': 'C. elegans',
               'comp_Dmelanogaster': 'D. melanogaster',
               'comp_Ecoli': 'E. coli',
               'comp_Hsapiens': 'H. sapiens',
               'comp_Mmusculus': 'M. musculus',
               'comp_Scerevisiae': 'S. cerevisiae'
               }


class Field(object):
    """ A representation of an HTML form field."""

    def __init__(self, name, default=None, conversion=None, options=None, errmsg="Illegal value."):
        self.name = name
        self.default = default
        self.value = default
        self.conversion = conversion
        self.options = options
        self.errmsg = errmsg

    def get_value(self):
        if self.options:
            if self.value not in self.options:
                raise ValueError(str((self.name, self.errmsg)))

        if self.conversion:
            try:
                return self.conversion(self.value)
            except ValueError:
                raise ValueError(str((self.name, self.errmsg)))
        else:
            return self.value


def string_or_none(value):
    if value is None or value == 'auto':
        return None
    return str(value)


def truth(value):
    if value == "true":
        return True
    return bool(value)


def int_or_none(value):
    if value == '' or value is None or value == 'auto':
        return None
    return int(value)


def float_or_none(value):
    if value == '' or value is None or value == 'auto':
        return None
    return float(value)


def main(htdocs_directory=None):
    logooptions = weblogo.LogoOptions()

    # A list of form fields.
    # The default for checkbox values must be False (irrespective of
    # the default in logooptions) since a checked checkbox returns 'true'
    # but an unchecked checkbox returns nothing.
    controls = [
        Field('sequences', ''),
        Field('sequences_url', ''),
        Field('format', 'png', weblogo.formatters.get,
              options=['png_print', 'png', 'jpeg', 'eps', 'pdf', 'svg', 'logodata'],
              # TODO: Should copy list from __init__.formatters
              errmsg="Unknown format option."),
        Field('stacks_per_line', logooptions.stacks_per_line, int,
              errmsg='Invalid number of stacks per line.'),
        Field('stack_width', 'medium', weblogo.std_sizes.get,
              options=['small', 'medium', 'large'], errmsg='Invalid logo size.'),
        Field('alphabet', 'alphabet_auto', alphabets.get,
              options=['alphabet_auto', 'alphabet_protein', 'alphabet_dna',
                       'alphabet_rna'],
              errmsg="Unknown sequence type."),
        Field('unit_name', 'bits',
              options=['probability', 'bits', 'nats', 'kT', 'kJ/mol',
                       'kcal/mol']),
        Field('first_index', 1, int_or_none),
        Field('logo_start', '', int_or_none),
        Field('logo_end', '', int_or_none),
        Field('composition', 'comp_auto', composition.get,
              options=['comp_none', 'comp_auto', 'comp_equiprobable', 'comp_CG',
                       'comp_Celegans', 'comp_Dmelanogaster', 'comp_Ecoli',
                       'comp_Hsapiens', 'comp_Mmusculus', 'comp_Scerevisiae'],
              errmsg="Illegal sequence composition."),
        Field('percentCG', '', float_or_none, errmsg="Invalid CG percentage."),
        Field('show_errorbars', False, truth),
        Field('logo_title', logooptions.logo_title),
        Field('logo_label', logooptions.logo_label),
        Field('show_xaxis', False, truth),
        Field('xaxis_label', logooptions.xaxis_label),
        Field('show_yaxis', False, truth),
        Field('yaxis_label', logooptions.yaxis_label, string_or_none),
        Field('yaxis_scale', logooptions.yaxis_scale, float_or_none,
              errmsg="The yaxis scale must be a positive number."),
        Field('yaxis_tic_interval', logooptions.yaxis_tic_interval,
              float_or_none),
        Field('show_ends', False, truth),
        Field('show_fineprint', False, truth),
        Field('color_scheme', 'color_auto', color_schemes.get,
              options=color_schemes.keys(),
              errmsg='Unknown color scheme'),
        Field('color0', ''),
        Field('symbols0', ''),
        Field('desc0', ''),
        Field('color1', ''),
        Field('symbols1', ''),
        Field('desc1', ''),
        Field('color2', ''),
        Field('symbols2', ''),
        Field('desc2', ''),
        Field('color3', ''),
        Field('symbols3', ''),
        Field('desc3', ''),
        Field('color4', ''),
        Field('symbols4', ''),
        Field('desc4', ''),
        Field('ignore_lower_case', False, truth),
        Field('scale_width', False, truth),
    ]

    form = {}
    for c in controls:
        form[c.name] = c

    form_values = cgilib.FieldStorage()

    # Send default form?
    if len(form_values) == 0 or "cmd_reset" in form_values:
        # Load default truth values now.
        form['show_errorbars'].value = logooptions.show_errorbars
        form['show_xaxis'].value = logooptions.show_xaxis
        form['show_yaxis'].value = logooptions.show_yaxis
        form['show_ends'].value = logooptions.show_ends
        form['show_fineprint'].value = logooptions.show_fineprint
        form['scale_width'].value = logooptions.scale_width

        send_form(controls, htdocs_directory=htdocs_directory)
        return

    # Get form content
    for c in controls:
        c.value = form_values.getfirst(c.name, c.default)

    options_from_form = ['format', 'stacks_per_line', 'stack_width',
                         'alphabet', 'unit_name', 'first_index', 'logo_start', 'logo_end',
                         'composition',
                         'show_errorbars', 'logo_title', 'logo_label', 'show_xaxis',
                         'xaxis_label',
                         'show_yaxis', 'yaxis_label', 'yaxis_scale', 'yaxis_tic_interval',
                         'show_ends', 'show_fineprint', 'scale_width']

    errors = []
    for optname in options_from_form:
        try:
            value = form[optname].get_value()
            if value is not None:
                setattr(logooptions, optname, value)
        except ValueError as err:
            errors.append(err.args)

    # Construct custom color scheme
    custom = ColorScheme()
    for i in range(0, 5):
        color = form["color%d" % i].get_value()
        symbols = form["symbols%d" % i].get_value()
        desc = form["desc%d" % i].get_value()

        if color:
            try:
                custom.rules.append(SymbolColor(symbols, color, desc))
            except ValueError:
                errors.append(('color%d' % i, "Invalid color: %s" % color))

    if form["color_scheme"].value == 'color_custom':
        logooptions.color_scheme = custom
    else:
        try:
            logooptions.color_scheme = form["color_scheme"].get_value()
        except ValueError as err:
            errors.append(err.args)

    # FIXME: Ugly fix: Must check that sequence_file key exists
    # FIXME: Sending malformed or missing form keys should not cause a crash
    # sequences_file = form["sequences_file"]
    sequences_from_file = None
    if "sequences_file" in form_values:
        sequences_from_file = form_values.getvalue("sequences_file")

    sequences_from_textfield = form["sequences"].get_value()
    sequences_url = form["sequences_url"].get_value()

    sequences = None
    seq_file = None

    if sequences_from_file:
        if sequences_from_textfield or sequences_url:
            errors.append(("sequences_file", "Cannot upload, sequence source conflict"))
        else:
            sequences = sequences_from_file
            seq_file = TextIOWrapper(BytesIO(sequences), encoding='utf-8')
    elif sequences_from_textfield:
        if sequences_url:
            errors.append(("sequences", "Cannot upload, sequence source conflict"))
        else:
            # check SEQUENCES_MAXLENGT
            # If a user tries to paste a very large file into sequence textarea,
            # then WebLogo runs very slow for no apparently good reason. (Might be client side bug?)
            # So we limit the maximum sequence size.
            # Form field also limits size, but not necessarly respected. Also can truncate data
            # without warning, so we'll set textarea maximum to be larger than MAX_SEQUENCE_SIZE
            SEQUENCES_MAXLENGTH = 100000
            if len(sequences_from_textfield) > SEQUENCES_MAXLENGTH:
                errors.append(("sequences",
                               "Sequence data too large for text input. Use file upload instead."))
                controls[0] = Field('sequences', '')
            else:
                sequences = sequences_from_textfield
                seq_file = StringIO(sequences)

    elif sequences_url:
        from . import _from_URL_fileopen
        try:
            seq_file = _from_URL_fileopen(sequences_url)
        except ValueError:
            errors.append(("sequences_url", "Cannot parse URL"))
        except IOError:
            errors.append(("sequences_url", "Cannot load sequences from URL"))

    else:
        errors.append(("sequences",
                       "Please enter a multiple-sequence alignment in the box above, or select a "
                       "file to upload."))

    # If we have uncovered errors or we want the chance to edit the logo
    # ("cmd_edit" command from examples page) then we return the form now.
    # We do not proceed to the time consuming logo creation step unless
    # required by a 'create' or 'validate' command, and no errors have been
    # found yet.
    if errors or "cmd_edit" in form_values:
        send_form(controls, errors, htdocs_directory)
        return

    try:
        comp = form["composition"].get_value()
        percentCG = form["percentCG"].get_value()
        ignore_lower_case = ("ignore_lower_case" in form_values)
        if comp == 'percentCG':
            comp = str(percentCG / 100)

        from .matrix import Motif

        try:
            # Try reading data in transfac format first.
            # TODO Refactor this code
            motif = Motif.read_transfac(seq_file, alphabet=logooptions.alphabet)
            prior = weblogo.parse_prior(comp, motif.alphabet)
            data = weblogo.LogoData.from_counts(motif.alphabet, motif, prior)
        except ValueError:
            seqs = weblogo.read_seq_data(seq_file, alphabet=logooptions.alphabet,
                                         ignore_lower_case=ignore_lower_case
                                         )
            prior = weblogo.parse_prior(comp, seqs.alphabet)
            data = weblogo.LogoData.from_seqs(seqs, prior)

        logoformat = weblogo.LogoFormat(data, logooptions)
        format = form["format"].value
        logo = weblogo.formatters[format](data, logoformat)
    except ValueError as err:
        errors.append(err.args)
    except IOError as err:
        errors.append(err.args)
    except RuntimeError as err:
        errors.append(err.args)

    if errors or "cmd_validate" in form_values:
        send_form(controls, errors, htdocs_directory)
        return

    #
    #  RETURN LOGO OVER HTTP
    #

    print("Content-Type:", mime_type[format])
    # Content-Disposition: inline       Open logo in browser window
    # Content-Disposition: attachment   Download logo
    if "download" in form_values:
        print('Content-Disposition: attachment; '
              'filename="logo.%s"' % extension[format])
    else:
        print('Content-Disposition: inline; '
              'filename="logo.%s"' % extension[format])
    # Separate header from data
    print()
    sys.stdout.flush()

    # Finally, and at last, send the logo.
    sys.stdout.buffer.write(logo)


def send_form(controls, errors=[], htdocs_directory=None):
    if htdocs_directory is None:
        htdocs_directory = os.path.join(
                os.path.dirname(__file__, "htdocs"))

    substitutions = {}
    substitutions["version"] = weblogo.release_description
    # Bug fix. Not sure why this default substitution isn't added automatically like everything else
    substitutions['color_custom'] = ''
    for c in controls:
        if c.options:
            for opt in c.options:
                substitutions[opt.replace('/', '_')] = ''
            substitutions[c.value.replace('/', '_')] = 'selected'
        else:
            value = c.value
            if value is None:
                value = 'auto'
            if value == 'true':
                substitutions[c.name] = 'checked'
            elif type(value) == bool:
                if value:
                    substitutions[c.name] = 'checked'
                else:
                    substitutions[c.name] = ''
            else:
                substitutions[c.name] = str(value)
        substitutions[c.name + '_err'] = ''
    substitutions['logo_range_err'] = ''

    # Disable graphics options if necessary auxiliary programs are not installed.
    if shutil.which('gs') is None and shutil.which('gswin32c.exe') is None:
        substitutions['png_print'] = 'disabled="disabled"'
        substitutions['png'] = 'disabled="disabled"'
        substitutions['jpeg'] = 'disabled="disabled"'
        substitutions['pdf'] = 'disabled="disabled"'
        substitutions['svg'] = 'disabled="disabled"'
        substitutions['eps'] = 'selected="selected"'

    if shutil.which('pdf2svg') is None:
        substitutions['svg'] = 'disabled="disabled"'

    if errors:
        print(errors, file=sys.stderr)
        error_message = []
        for e in errors:
            if type(e) is str:
                msg = e
            elif len(e) == 2:
                substitutions[e[0] + "_err"] = "class='error'"
                msg = e[1]
            else:
                msg = e[0]

            error_message += "ERROR: "
            error_message += msg
            error_message += ' <br />'

        error_message += \
            "<input style='float:right; font-size:small' type='submit' " \
            "name='cmd_validate' value='Clear Error' /> "
        substitutions["error_message"] = ''.join(error_message)
    else:
        substitutions["error_message"] = ""

    template = resource_string("create_html_template.html", htdocs_directory)
    html = Template(template).safe_substitute(substitutions)  # FIXME

    print("Content-Type: text/html\n\n")
    print(html)

    # DEBUG
    # keys = substitutions.keys()
    # keys.sort()
    # for k in keys :
    #    print(k, "=", substitutions[k], " <br />")

    # print(" <br />")
    # print(" <br />")
    # for k in controls :
    #    print(k.name, "=", k.get_value(), " <br />")


if __name__ == "__main__":
    from . import _cli

    _cli.main()