"""JSON Formatting Script

Spits out a JSON file formatted with one of QMK's formatters.
"""
import json

from jsonschema import ValidationError
from milc import cli

from qmk.info import info_json
from qmk.json_schema import json_load, validate
from qmk.json_encoders import InfoJSONEncoder, KeymapJSONEncoder, UserspaceJSONEncoder
from qmk.path import normpath


def _detect_json_format(file, json_data):
    """Detect the format of a json file.
    """
    json_encoder = None
    try:
        validate(json_data, 'qmk.user_repo.v1')
        json_encoder = UserspaceJSONEncoder
    except ValidationError:
        pass

    if json_encoder is None:
        try:
            validate(json_data, 'qmk.keyboard.v1')
            json_encoder = InfoJSONEncoder
        except ValidationError as e:
            cli.log.warning('File %s did not validate as a keyboard info.json or userspace qmk.json:\n\t%s', file, e)
            cli.log.info('Treating %s as a keymap file.', file)
            json_encoder = KeymapJSONEncoder

    return json_encoder


def _get_json_encoder(file, json_data):
    """Get the json encoder for a file.
    """
    json_encoder = None
    if cli.args.format == 'auto':
        json_encoder = _detect_json_format(file, json_data)
    elif cli.args.format == 'keyboard':
        json_encoder = InfoJSONEncoder
    elif cli.args.format == 'keymap':
        json_encoder = KeymapJSONEncoder
    elif cli.args.format == 'userspace':
        json_encoder = UserspaceJSONEncoder
    else:
        # This should be impossible
        cli.log.error('Unknown format: %s', cli.args.format)
    return json_encoder


@cli.argument('json_file', arg_only=True, type=normpath, help='JSON file to format')
@cli.argument('-f', '--format', choices=['auto', 'keyboard', 'keymap', 'userspace'], default='auto', arg_only=True, help='JSON formatter to use (Default: autodetect)')
@cli.argument('-i', '--inplace', action='store_true', arg_only=True, help='If set, will operate in-place on the input file')
@cli.argument('-p', '--print', action='store_true', arg_only=True, help='If set, will print the formatted json to stdout ')
@cli.subcommand('Generate an info.json file for a keyboard.', hidden=False if cli.config.user.developer else True)
def format_json(cli):
    """Format a json file.
    """
    json_data = json_load(cli.args.json_file)

    json_encoder = _get_json_encoder(cli.args.json_file, json_data)
    if json_encoder is None:
        return False

    if json_encoder == KeymapJSONEncoder and 'layout' in json_data:
        # Attempt to format the keycodes.
        layout = json_data['layout']
        info_data = info_json(json_data['keyboard'])

        if layout in info_data.get('layout_aliases', {}):
            layout = json_data['layout'] = info_data['layout_aliases'][layout]

        if layout in info_data.get('layouts'):
            for layer_num, layer in enumerate(json_data['layers']):
                current_layer = []
                last_row = 0

                for keymap_key, info_key in zip(layer, info_data['layouts'][layout]['layout']):
                    if last_row != info_key['y']:
                        current_layer.append('JSON_NEWLINE')
                        last_row = info_key['y']

                    current_layer.append(keymap_key)

                json_data['layers'][layer_num] = current_layer

    output = json.dumps(json_data, cls=json_encoder, sort_keys=True)

    if cli.args.inplace:
        with open(cli.args.json_file, 'w+', encoding='utf-8') as outfile:
            outfile.write(output)

    # Display the results if print was set
    # We don't operate in-place by default, so also display to stdout
    # if in-place is not set.
    if cli.args.print or not cli.args.inplace:
        print(output)