"""Supplementary scripts for graphics conversion."""

import os
import argparse

from utils import gfx, lz

def recursive_read(filename):
    def recurse(filename_):
        lines = []
        for line in open(filename_):
            if 'include "' in line.lower():
                lines += recurse(line.split('"')[1])
            else:
                lines += [line]
        return lines
    lines = recurse(filename)
    return ''.join(lines)

base_stats = None
def get_base_stats():
    global base_stats
    if not base_stats:
        base_stats = recursive_read('data/base_stats.asm')
    return base_stats

def get_pokemon_dimensions(name):
    try:
        if name == 'egg':
            return 5, 5
        if name == 'questionmark':
            return 7, 7
        if name.startswith('unown_'):
            name = 'unown'
        base_stats = get_base_stats()
        start = base_stats.find('\tdb ' + name.upper())
        start = base_stats.find('\tdn ', start)
        end = base_stats.find('\n', start)
        line = base_stats[start:end].replace(',', ' ')
        w, h = map(int, line.split()[1:3])
        return w, h
    except:
        return 7, 7

def filepath_rules(filepath):
    """Infer attributes of certain graphics by their location in the filesystem."""
    args = {}

    filedir, filename = os.path.split(filepath)
    if filedir.startswith('./'):
        filedir = filedir[2:]

    name, ext = os.path.splitext(filename)
    if ext == '.lz':
        name, ext = os.path.splitext(name)

    pokemon_name = ''

    if 'gfx/pics/' in filedir:
        pokemon_name = filedir.split('/')[-1]
        if pokemon_name.startswith('unown_'):
            index = filedir.find(pokemon_name)
            if index != -1:
                filedir = filedir[:index + len('unown')] + filedir[index + len('unown_a'):]
        if name == 'front':
            args['pal_file'] = os.path.join(filedir, 'normal.pal')
            args['pic'] = True
            args['animate'] = True
        elif name == 'back':
            args['pal_file'] = os.path.join(filedir, 'shiny.pal')
            args['pic'] = True

    elif 'gfx/trainers' in filedir:
        args['pic'] = True

    elif 'gfx/shrink' in filedir:
        args['pic'] = True

    elif filedir == 'gfx/tilesets':
        args['tileset'] = True

    if args.get('pal_file'):
        if os.path.exists(args['pal_file']):
            args['palout'] = args['pal_file']
        else:
            del args['pal_file']

    if args.get('pic'):
        if ext == '.png':
            w, h = gfx.png.Reader(filepath).asRGBA8()[:2]
            w = min(w//8, h//8)
            args['pic_dimensions'] = w, w
        elif ext == '.2bpp':
            if pokemon_name and name == 'front':
                w, h = get_pokemon_dimensions(pokemon_name)
                args['pic_dimensions'] = w, w
            elif pokemon_name and name == 'back':
                args['pic_dimensions'] = 6, 6
            else:
                args['pic_dimensions'] = 7, 7

    if args.get('tileset'):
        args['width'] = 128
    return args


def export_png_to_pal(png_path, **kwargs):
    arguments = gfx.read_filename_arguments(png_path)
    arguments.update(kwargs)

    image, arguments = gfx.png_to_2bpp(png_path, **arguments)

    palette = arguments.get('palette')
    palette_path = arguments.get('pal_file')
    if not palette_path:
        palette_path = os.path.splitext(png_path)[0] + '.pal'
    print(palette_path)
    gfx.export_palette(palette, palette_path)

def to_pal(filename, **kwargs):
    name, ext = os.path.splitext(filename)
    if ext == '.png': export_png_to_pal(filename, **kwargs)
    else: raise Exception('Don\'t know how to convert {} to pal'.format(ext, filename))

def to_1bpp(filename, **kwargs):
    name, ext = os.path.splitext(filename)
    if   ext == '.1bpp': pass
    elif ext == '.2bpp': gfx.export_2bpp_to_1bpp(filename, **kwargs)
    elif ext == '.png':  gfx.export_png_to_1bpp(filename, **kwargs)
    elif ext == '.lz':
        decompress(filename, **kwargs)
        to_1bpp(name, **kwargs)
    else: raise Exception('Don\'t know how to convert {} to 1bpp'.format(ext, filename))

def to_2bpp(filename, **kwargs):
    name, ext = os.path.splitext(filename)
    if   ext == '.1bpp': gfx.export_1bpp_to_2bpp(filename, **kwargs)
    elif ext == '.2bpp': pass
    elif ext == '.png':  gfx.export_png_to_2bpp(filename, **kwargs)
    elif ext == '.lz':
        decompress(filename, **kwargs)
        to_2bpp(name, **kwargs)
    else: raise Exception('Don\'t know how to convert {} to 2bpp'.format(ext, filename))

def to_png(filename, **kwargs):
    name, ext = os.path.splitext(filename)
    if   ext == '.1bpp': gfx.export_1bpp_to_png(filename, **kwargs)
    elif ext == '.2bpp': gfx.export_2bpp_to_png(filename, **kwargs)
    elif ext == '.png':  pass
    elif ext == '.lz':
        decompress(filename, **kwargs)
        to_png(name, **kwargs)
    else: raise Exception('Don\'t know how to convert {} to png'.format(ext, filename))

def compress(filename, **kwargs):
    data = open(filename, 'rb').read()
    lz_data = lz.Compressed(data).output
    open(filename + '.lz', 'wb').write(bytearray(lz_data))

def decompress(filename, **kwargs):
    lz_data = open(filename, 'rb').read()
    data = lz.Decompressed(lz_data).output
    name, ext = os.path.splitext(filename)
    open(name, 'wb').write(bytearray(data))


methods = {
    '2bpp': to_2bpp,
    '1bpp': to_1bpp,
    'png':  to_png,
    'lz':   compress,
    'unlz': decompress,
    'pal':  to_pal,
}

def main(method_name, filenames=None):
    method = methods.get(method_name)
    if not method:
        raise Exception('unknown method: {}'.format(method_name))
    for filename in filenames or []:
        args = filepath_rules(filename)
        method(filename, **args)

def get_args():
    ap = argparse.ArgumentParser()
    ap.add_argument('method_name')
    ap.add_argument('filenames', nargs='*')
    args = ap.parse_args()
    return args

if __name__ == '__main__':
    main(**get_args().__dict__)
