#!/usr/bin/env python3

"""
This script is used to help cleaning RNA api.

Typical line in the input file (elements in [] are optional).

[comment *] ToolSettings.snap_align_rotation -> use_snap_align_rotation:    boolean    [Align rotation with the snapping target]

Geterate output format from blender run this:
 ./blender.bin --background -noaudio --python ./release/scripts/modules/rna_info.py 2> source/blender/makesrna/rna_cleanup/out.txt
"""


def font_bold(mystring):
    """
    Formats the string as bold, to be used in printouts.
    """
    font_bold = "\033[1m"
    font_reset = "\033[0;0m"
    return font_bold + mystring + font_reset


def usage():
    """
    Prints script usage.
    """
    import sys
    scriptname = sys.argv[0]
    sort_choices_string = '|'.join(sort_choices)
    message = "\nUSAGE:"
    message += "\n%s input-file (.txt|.py) order-priority (%s).\n" % (font_bold(scriptname), sort_choices_string)
    message += "%s -h for help\n" % font_bold(scriptname)
    print(message)
    exit()


def help():
    """
    Prints script' help.
    """
    message = '\nHELP:'
    message += '\nRun this script to re-format the edits you make in the input file.\n'
    message += 'Do quick modification to important fields like \'to\' and don\'t care about fields like \'changed\' or \'description\' and save.\n'
    message += 'The script outputs 3 files:\n'
    message += '   1) *_clean.txt: is formatted same as the .txt input, can be edited by user.\n'
    message += '   2) *_clean.py: is formatted same as the .py input, can be edited by user.\n'
    message += '   3) rna_api.py is not formatted for readability and go under complete check. Can be used for rna cleanup.\n'
    print(message)
    usage()


def check_commandline():
    """
    Takes parameters from the commandline.
    """
    import sys
    # Usage
    if len(sys.argv) == 1 or len(sys.argv) > 3:
        usage()
    if sys.argv[1] == '-h':
        help()
    elif not sys.argv[1].endswith((".txt", ".py")):
        print('\nBad input file extension... exiting.')
        usage()
    else:
        inputfile = sys.argv[1]
    if len(sys.argv) == 2:
        sort_priority = default_sort_choice
        print('\nSecond parameter missing: choosing to order by %s.' % font_bold(sort_priority))
    elif len(sys.argv) == 3:
        sort_priority = sys.argv[2]
        if sort_priority not in sort_choices:
            print('\nWrong sort_priority... exiting.')
            usage()
    return (inputfile, sort_priority)


def check_prefix(prop, btype):
    # reminder: props=[comment, changed, bclass, bfrom, bto, kwcheck, btype, description]
    if btype == "boolean":
        if '_' in prop:
            prefix = prop.split('_')[0]
            if prefix not in kw_prefixes:
                return 'BAD-PREFIX: ' + prefix
            else:
                return prefix + '_'
        elif prop in kw:
            return 'SPECIAL-KEYWORD: ' + prop
        else:
            return 'BAD-KEYWORD: ' + prop
    else:
        return ""


def check_if_changed(a, b):
    if a != b:
        return 'changed'
    else:
        return 'same'


def get_props_from_txt(input_filename):
    """
    If the file is *.txt, the script assumes it is formatted as outlined in this script docstring
    """

    file = open(input_filename, 'r')
    file_lines = file.readlines()
    file.close()

    props_list = []
    props_length_max = [0, 0, 0, 0, 0, 0, 0, 0]

    done_text = "+"
    done = 0
    tot = 0

    for iii, line in enumerate(file_lines):

        # debug
        # print(line)
        line_strip = line.strip()
        # empty line or comment
        if not line_strip:
            continue

        if line_strip == "EOF":
            break

        if line.startswith("#"):
            line = line[1:]

        # class
        bclass, tail = [x.strip() for x in line.split('.', 1)]

        # comment
        if '*' in bclass:
            comment, bclass = [x.strip() for x in bclass.split('*', 1)]
        else:
            comment = ''

        # skipping the header if we have one.
        # the header is assumed to be "NOTE * CLASS.FROM -> TO:   TYPE  DESCRIPTION"
        if comment == 'NOTE' and bclass == 'CLASS':
            continue

        # from
        bfrom, tail = [x.strip() for x in tail.split('->', 1)]

        # to
        bto, tail = [x.strip() for x in tail.split(':', 1)]

        # type, description
        try:
            btype, description = tail.split(None, 1)
            # make life easy and strip quotes
            description = description.replace("'", "").replace('"', "").replace("\\", "").strip()
        except ValueError:
            btype, description = [tail, 'NO DESCRIPTION']

        # keyword-check
        kwcheck = check_prefix(bto, btype)

        # changed
        changed = check_if_changed(bfrom, bto)

        # lists formatting
        props = [comment, changed, bclass, bfrom, bto, kwcheck, btype, description]
        props_list.append(props)
        props_length_max = list(map(max, zip(props_length_max, list(map(len, props)))))

        if done_text in comment:
            done += 1
        tot += 1

    print("Total done %.2f" % (done / tot * 100.0))

    return (props_list, props_length_max)


def get_props_from_py(input_filename):
    """
    If the file is *.py, the script assumes it contains a python list (as "rna_api=[...]")
    This means that this script executes the text in the py file with an exec(text).
    """
    # adds the list "rna_api" to this function's scope
    rna_api = __import__(input_filename[:-3]).rna_api

    props_length_max = [0 for i in rna_api[0]]  # this way if the vector will take more elements we are safe
    for index, props in enumerate(rna_api):
        comment, changed, bclass, bfrom, bto, kwcheck, btype, description = props
        kwcheck = check_prefix(bto, btype)   # keyword-check
        changed = check_if_changed(bfrom, bto)  # changed?
        description = repr(description)
        description = description.replace("'", "").replace('"', "").replace("\\", "").strip()
        rna_api[index] = [comment, changed, bclass, bfrom, bto, kwcheck, btype, description]
        props_length = list(map(len, props))  # lengths
        props_length_max = list(map(max, zip(props_length_max, props_length)))    # max lengths
    return (rna_api, props_length_max)


def get_props(input_filename):
    if input_filename.endswith(".txt"):
        props_list, props_length_max = get_props_from_txt(input_filename)
    elif input_filename.endswith(".py"):
        props_list, props_length_max = get_props_from_py(input_filename)
    return (props_list, props_length_max)


def sort(props_list, sort_priority):
    """
    reminder
    props=[comment, changed, bclass, bfrom, bto, kwcheck, btype, description]
    """

    # order based on the i-th element in lists
    if sort_priority == "class.to":
        props_list = sorted(props_list, key=lambda p: (p[2], p[4]))
    else:
        i = sort_choices.index(sort_priority)
        if i == 0:
            props_list = sorted(props_list, key=lambda p: p[i], reverse=True)
        else:
            props_list = sorted(props_list, key=lambda p: p[i])

    print('\nSorted by %s.' % font_bold(sort_priority))
    return props_list


def file_basename(input_filename):
    # if needed will use os.path
    if input_filename.endswith(".txt"):
        if input_filename.endswith("_work.txt"):
            base_filename = input_filename.replace("_work.txt", "")
        else:
            base_filename = input_filename.replace(".txt", "")
    elif input_filename.endswith(".py"):
        if input_filename.endswith("_work.py"):
            base_filename = input_filename.replace("_work.py", "")
        else:
            base_filename = input_filename.replace(".py", "")

    return base_filename


def write_files(basename, props_list, props_length_max):
    """
    Writes in 3 files:
      * output_filename_work.txt: formatted as txt input file (can be edited)
      * output_filename_work.py:  formatted for readability (can be edited)
      * rna_api.py: unformatted, just as final output
    """

    f_rna = open("rna_api.py", 'w')
    f_txt = open(basename + '_work.txt', 'w')
    f_py = open(basename + '_work.py', 'w')

    # reminder: props=[comment, changed, bclass, bfrom, bto, kwcheck, btype, description]
    # [comment *] ToolSettings.snap_align_rotation -> use_snap_align_rotation:    boolean    [Align rotation with the snapping target]
    rna = py = txt = ''
    props_list = [['NOTE', 'CHANGED', 'CLASS', 'FROM', 'TO', 'KEYWORD-CHECK', 'TYPE', 'DESCRIPTION']] + props_list
    for props in props_list:
        # txt

        # quick way we can tell if it changed
        if props[3] == props[4]:
            txt += "#"
        else:
            txt += " "

        if props[0] != '':
            txt += '%s * ' % props[0]   # comment
        txt += '%s.%s -> %s:   %s  "%s"\n' % tuple(props[2:5] + props[6:])   # skipping keyword-check
        # rna_api
        if props[0] == 'NOTE':
            indent = '#   '
        else:
            indent = '    '
        # Description is already string formatted.
        rna += indent + '("%s", "%s", "%s", "%s", "%s"),\n' % tuple(props[2:5] + props[6:])
        # py
        blanks = [' ' * (x[0] - x[1]) for x in zip(props_length_max, list(map(len, props)))]
        props = [('"%s"%s' if props[-1] != x[0] else "%s%s") % (x[0], x[1]) for x in zip(props, blanks)]
        py += indent + '(%s, %s, %s, %s, %s, %s, %s, "%s"),\n' % tuple(props)

    f_txt.write(txt)
    f_py.write("rna_api = [\n%s]\n" % py)
    f_rna.write("rna_api = [\n%s]\n" % rna)

    # write useful py script, wont hurt
    f_py.write("\n'''\n")
    f_py.write("for p_note, p_changed, p_class, p_from, p_to, p_check, p_type, p_desc in rna_api:\n")
    f_py.write("    print(p_to)\n")
    f_py.write("\n'''\n")

    f_txt.close()
    f_py.close()
    f_rna.close()

    print('\nSaved %s, %s and %s.\n' % (font_bold(f_txt.name), font_bold(f_py.name), font_bold(f_rna.name)))


def main():

    global sort_choices, default_sort_choice
    global kw_prefixes, kw

    sort_choices = ['note', 'changed', 'class', 'from', 'to', 'kw', 'class.to']
    default_sort_choice = sort_choices[-1]
    kw_prefixes = ['active', 'apply', 'bl', 'exclude', 'has', 'invert', 'is', 'lock',
                   'pressed', 'show', 'show_only', 'use', 'use_only', 'layers', 'states', 'select']
    kw = ['active', 'hide', 'invert', 'select', 'layers', 'mute', 'states', 'use', 'lock']

    input_filename, sort_priority = check_commandline()
    props_list, props_length_max = get_props(input_filename)
    props_list = sort(props_list, sort_priority)

    output_basename = file_basename(input_filename)
    write_files(output_basename, props_list, props_length_max)


if __name__ == '__main__':
    import sys
    if sys.version_info.major < 3:
        print("Incorrect python version, use Python 3 or newer!")
    else:
        main()