"""Functions that help us generate and use info.json files.
"""
from glob import glob
from pathlib import Path

import jsonschema
from dotty_dict import dotty
from milc import cli

from qmk.constants import CHIBIOS_PROCESSORS, LUFA_PROCESSORS, VUSB_PROCESSORS
from qmk.c_parse import find_layouts
from qmk.json_schema import deep_update, json_load, keyboard_validate, keyboard_api_validate
from qmk.keyboard import config_h, rules_mk
from qmk.keymap import list_keymaps
from qmk.makefile import parse_rules_mk_file
from qmk.math import compute

true_values = ['1', 'on', 'yes']
false_values = ['0', 'off', 'no']


def _valid_community_layout(layout):
    """Validate that a declared community list exists
    """
    return (Path('layouts/default') / layout).exists()


def info_json(keyboard):
    """Generate the info.json data for a specific keyboard.
    """
    cur_dir = Path('keyboards')
    rules = parse_rules_mk_file(cur_dir / keyboard / 'rules.mk')
    if 'DEFAULT_FOLDER' in rules:
        keyboard = rules['DEFAULT_FOLDER']
        rules = parse_rules_mk_file(cur_dir / keyboard / 'rules.mk', rules)

    info_data = {
        'keyboard_name': str(keyboard),
        'keyboard_folder': str(keyboard),
        'keymaps': {},
        'layouts': {},
        'parse_errors': [],
        'parse_warnings': [],
        'maintainer': 'qmk',
    }

    # Populate the list of JSON keymaps
    for keymap in list_keymaps(keyboard, c=False, fullpath=True):
        info_data['keymaps'][keymap.name] = {'url': f'https://raw.githubusercontent.com/qmk/qmk_firmware/master/{keymap}/keymap.json'}

    # Populate layout data
    layouts, aliases = _find_all_layouts(info_data, keyboard)

    if aliases:
        info_data['layout_aliases'] = aliases

    for layout_name, layout_json in layouts.items():
        if not layout_name.startswith('LAYOUT_kc'):
            layout_json['c_macro'] = True
            info_data['layouts'][layout_name] = layout_json

    # Merge in the data from info.json, config.h, and rules.mk
    info_data = merge_info_jsons(keyboard, info_data)
    info_data = _extract_config_h(info_data)
    info_data = _extract_rules_mk(info_data)

    # Validate against the jsonschema
    try:
        keyboard_api_validate(info_data)

    except jsonschema.ValidationError as e:
        json_path = '.'.join([str(p) for p in e.absolute_path])
        cli.log.error('Invalid API data: %s: %s: %s', keyboard, json_path, e.message)
        exit(1)

    # Make sure we have at least one layout
    if not info_data.get('layouts'):
        _log_error(info_data, 'No LAYOUTs defined! Need at least one layout defined in the keyboard.h or info.json.')

    # Filter out any non-existing community layouts
    for layout in info_data.get('community_layouts', []):
        if not _valid_community_layout(layout):
            # Ignore layout from future checks
            info_data['community_layouts'].remove(layout)
            _log_error(info_data, 'Claims to support a community layout that does not exist: %s' % (layout))

    # Make sure we supply layout macros for the community layouts we claim to support
    for layout in info_data.get('community_layouts', []):
        layout_name = 'LAYOUT_' + layout
        if layout_name not in info_data.get('layouts', {}) and layout_name not in info_data.get('layout_aliases', {}):
            _log_error(info_data, 'Claims to support community layout %s but no %s() macro found' % (layout, layout_name))

    return info_data


def _extract_features(info_data, rules):
    """Find all the features enabled in rules.mk.
    """
    # Special handling for bootmagic which also supports a "lite" mode.
    if rules.get('BOOTMAGIC_ENABLE') == 'lite':
        rules['BOOTMAGIC_LITE_ENABLE'] = 'on'
        del rules['BOOTMAGIC_ENABLE']
    if rules.get('BOOTMAGIC_ENABLE') == 'full':
        rules['BOOTMAGIC_ENABLE'] = 'on'

    # Skip non-boolean features we haven't implemented special handling for
    for feature in 'HAPTIC_ENABLE', 'QWIIC_ENABLE':
        if rules.get(feature):
            del rules[feature]

    # Process the rest of the rules as booleans
    for key, value in rules.items():
        if key.endswith('_ENABLE'):
            key = '_'.join(key.split('_')[:-1]).lower()
            value = True if value.lower() in true_values else False if value.lower() in false_values else value

            if 'config_h_features' not in info_data:
                info_data['config_h_features'] = {}

            if 'features' not in info_data:
                info_data['features'] = {}

            if key in info_data['features']:
                _log_warning(info_data, 'Feature %s is specified in both info.json and rules.mk, the rules.mk value wins.' % (key,))

            info_data['features'][key] = value
            info_data['config_h_features'][key] = value

    return info_data


def _pin_name(pin):
    """Returns the proper representation for a pin.
    """
    pin = pin.strip()

    if not pin:
        return None

    elif pin.isdigit():
        return int(pin)

    elif pin == 'NO_PIN':
        return None

    elif pin[0] in 'ABCDEFGHIJK' and pin[1].isdigit():
        return pin

    raise ValueError(f'Invalid pin: {pin}')


def _extract_pins(pins):
    """Returns a list of pins from a comma separated string of pins.
    """
    return [_pin_name(pin) for pin in pins.split(',')]


def _extract_direct_matrix(info_data, direct_pins):
    """
    """
    info_data['matrix_pins'] = {}
    direct_pin_array = []

    while direct_pins[-1] != '}':
        direct_pins = direct_pins[:-1]

    for row in direct_pins.split('},{'):
        if row.startswith('{'):
            row = row[1:]

        if row.endswith('}'):
            row = row[:-1]

        direct_pin_array.append([])

        for pin in row.split(','):
            if pin == 'NO_PIN':
                pin = None

            direct_pin_array[-1].append(pin)

    return direct_pin_array


def _extract_matrix_info(info_data, config_c):
    """Populate the matrix information.
    """
    row_pins = config_c.get('MATRIX_ROW_PINS', '').replace('{', '').replace('}', '').strip()
    col_pins = config_c.get('MATRIX_COL_PINS', '').replace('{', '').replace('}', '').strip()
    direct_pins = config_c.get('DIRECT_PINS', '').replace(' ', '')[1:-1]

    if 'MATRIX_ROWS' in config_c and 'MATRIX_COLS' in config_c:
        if 'matrix_size' in info_data:
            _log_warning(info_data, 'Matrix size is specified in both info.json and config.h, the config.h values win.')

        info_data['matrix_size'] = {
            'cols': compute(config_c.get('MATRIX_COLS', '0')),
            'rows': compute(config_c.get('MATRIX_ROWS', '0')),
        }

    if row_pins and col_pins:
        if 'matrix_pins' in info_data:
            _log_warning(info_data, 'Matrix pins are specified in both info.json and config.h, the config.h values win.')

        info_data['matrix_pins'] = {
            'cols': _extract_pins(col_pins),
            'rows': _extract_pins(row_pins),
        }

    if direct_pins:
        if 'matrix_pins' in info_data:
            _log_warning(info_data, 'Direct pins are specified in both info.json and config.h, the config.h values win.')

        info_data['matrix_pins']['direct'] = _extract_direct_matrix(info_data, direct_pins)

    return info_data


def _extract_config_h(info_data):
    """Pull some keyboard information from existing config.h files
    """
    config_c = config_h(info_data['keyboard_folder'])

    # Pull in data from the json map
    dotty_info = dotty(info_data)
    info_config_map = json_load(Path('data/mappings/info_config.json'))

    for config_key, info_dict in info_config_map.items():
        info_key = info_dict['info_key']
        key_type = info_dict.get('value_type', 'str')

        try:
            if config_key in config_c and info_dict.get('to_json', True):
                if dotty_info.get(info_key) and info_dict.get('warn_duplicate', True):
                    _log_warning(info_data, '%s in config.h is overwriting %s in info.json' % (config_key, info_key))

                if key_type.startswith('array'):
                    if '.' in key_type:
                        key_type, array_type = key_type.split('.', 1)
                    else:
                        array_type = None

                    config_value = config_c[config_key].replace('{', '').replace('}', '').strip()

                    if array_type == 'int':
                        dotty_info[info_key] = list(map(int, config_value.split(',')))
                    else:
                        dotty_info[info_key] = config_value.split(',')

                elif key_type == 'bool':
                    dotty_info[info_key] = config_c[config_key] in true_values

                elif key_type == 'hex':
                    dotty_info[info_key] = '0x' + config_c[config_key][2:].upper()

                elif key_type == 'list':
                    dotty_info[info_key] = config_c[config_key].split()

                elif key_type == 'int':
                    dotty_info[info_key] = int(config_c[config_key])

                else:
                    dotty_info[info_key] = config_c[config_key]

        except Exception as e:
            _log_warning(info_data, f'{config_key}->{info_key}: {e}')

    info_data.update(dotty_info)

    # Pull data that easily can't be mapped in json
    _extract_matrix_info(info_data, config_c)

    return info_data


def _extract_rules_mk(info_data):
    """Pull some keyboard information from existing rules.mk files
    """
    rules = rules_mk(info_data['keyboard_folder'])
    info_data['processor'] = rules.get('MCU', info_data.get('processor', 'atmega32u4'))

    if info_data['processor'] in CHIBIOS_PROCESSORS:
        arm_processor_rules(info_data, rules)

    elif info_data['processor'] in LUFA_PROCESSORS + VUSB_PROCESSORS:
        avr_processor_rules(info_data, rules)

    else:
        cli.log.warning("%s: Unknown MCU: %s" % (info_data['keyboard_folder'], info_data['processor']))
        unknown_processor_rules(info_data, rules)

    # Pull in data from the json map
    dotty_info = dotty(info_data)
    info_rules_map = json_load(Path('data/mappings/info_rules.json'))

    for rules_key, info_dict in info_rules_map.items():
        info_key = info_dict['info_key']
        key_type = info_dict.get('value_type', 'str')

        try:
            if rules_key in rules and info_dict.get('to_json', True):
                if dotty_info.get(info_key) and info_dict.get('warn_duplicate', True):
                    _log_warning(info_data, '%s in rules.mk is overwriting %s in info.json' % (rules_key, info_key))

                if key_type.startswith('array'):
                    if '.' in key_type:
                        key_type, array_type = key_type.split('.', 1)
                    else:
                        array_type = None

                    rules_value = rules[rules_key].replace('{', '').replace('}', '').strip()

                    if array_type == 'int':
                        dotty_info[info_key] = list(map(int, rules_value.split(',')))
                    else:
                        dotty_info[info_key] = rules_value.split(',')

                elif key_type == 'list':
                    dotty_info[info_key] = rules[rules_key].split()

                elif key_type == 'bool':
                    dotty_info[info_key] = rules[rules_key] in true_values

                elif key_type == 'hex':
                    dotty_info[info_key] = '0x' + rules[rules_key][2:].upper()

                elif key_type == 'int':
                    dotty_info[info_key] = int(rules[rules_key])

                else:
                    dotty_info[info_key] = rules[rules_key]

        except Exception as e:
            _log_warning(info_data, f'{rules_key}->{info_key}: {e}')

    info_data.update(dotty_info)

    # Merge in config values that can't be easily mapped
    _extract_features(info_data, rules)

    return info_data


def _merge_layouts(info_data, new_info_data):
    """Merge new_info_data into info_data in an intelligent way.
    """
    for layout_name, layout_json in new_info_data['layouts'].items():
        if layout_name in info_data['layouts']:
            # Pull in layouts we have a macro for
            if len(info_data['layouts'][layout_name]['layout']) != len(layout_json['layout']):
                msg = '%s: %s: Number of elements in info.json does not match! info.json:%s != %s:%s'
                _log_error(info_data, msg % (info_data['keyboard_folder'], layout_name, len(layout_json['layout']), layout_name, len(info_data['layouts'][layout_name]['layout'])))
            else:
                for i, key in enumerate(info_data['layouts'][layout_name]['layout']):
                    key.update(layout_json['layout'][i])
        else:
            # Pull in layouts that have matrix data
            missing_matrix = False
            for key in layout_json.get('layout', {}):
                if 'matrix' not in key:
                    missing_matrix = True

            if not missing_matrix:
                if layout_name in info_data['layouts']:
                    # Update an existing layout with new data
                    for i, key in enumerate(info_data['layouts'][layout_name]['layout']):
                        key.update(layout_json['layout'][i])

                else:
                    # Copy in the new layout wholesale
                    layout_json['c_macro'] = False
                    info_data['layouts'][layout_name] = layout_json

    return info_data


def _search_keyboard_h(path):
    current_path = Path('keyboards/')
    aliases = {}
    layouts = {}

    for directory in path.parts:
        current_path = current_path / directory
        keyboard_h = '%s.h' % (directory,)
        keyboard_h_path = current_path / keyboard_h
        if keyboard_h_path.exists():
            new_layouts, new_aliases = find_layouts(keyboard_h_path)
            layouts.update(new_layouts)

            for alias, alias_text in new_aliases.items():
                if alias_text in layouts:
                    aliases[alias] = alias_text

    return layouts, aliases


def _find_all_layouts(info_data, keyboard):
    """Looks for layout macros associated with this keyboard.
    """
    layouts, aliases = _search_keyboard_h(Path(keyboard))

    if not layouts:
        # If we don't find any layouts from info.json or keyboard.h we widen our search. This is error prone which is why we want to encourage people to follow the standard above.
        info_data['parse_warnings'].append('%s: Falling back to searching for KEYMAP/LAYOUT macros.' % (keyboard))

        for file in glob('keyboards/%s/*.h' % keyboard):
            if file.endswith('.h'):
                these_layouts, these_aliases = find_layouts(file)

                if these_layouts:
                    layouts.update(these_layouts)

                for alias, alias_text in these_aliases.items():
                    if alias_text in layouts:
                        aliases[alias] = alias_text

    return layouts, aliases


def _log_error(info_data, message):
    """Send an error message to both JSON and the log.
    """
    info_data['parse_errors'].append(message)
    cli.log.error('%s: %s', info_data.get('keyboard_folder', 'Unknown Keyboard!'), message)


def _log_warning(info_data, message):
    """Send a warning message to both JSON and the log.
    """
    info_data['parse_warnings'].append(message)
    cli.log.warning('%s: %s', info_data.get('keyboard_folder', 'Unknown Keyboard!'), message)


def arm_processor_rules(info_data, rules):
    """Setup the default info for an ARM board.
    """
    info_data['processor_type'] = 'arm'
    info_data['protocol'] = 'ChibiOS'

    if 'bootloader' not in info_data:
        if 'STM32' in info_data['processor']:
            info_data['bootloader'] = 'stm32-dfu'
        else:
            info_data['bootloader'] = 'unknown'

    if 'STM32' in info_data['processor']:
        info_data['platform'] = 'STM32'
    elif 'MCU_SERIES' in rules:
        info_data['platform'] = rules['MCU_SERIES']
    elif 'ARM_ATSAM' in rules:
        info_data['platform'] = 'ARM_ATSAM'

    return info_data


def avr_processor_rules(info_data, rules):
    """Setup the default info for an AVR board.
    """
    info_data['processor_type'] = 'avr'
    info_data['platform'] = rules['ARCH'] if 'ARCH' in rules else 'unknown'
    info_data['protocol'] = 'V-USB' if rules.get('MCU') in VUSB_PROCESSORS else 'LUFA'

    if 'bootloader' not in info_data:
        info_data['bootloader'] = 'atmel-dfu'

    # FIXME(fauxpark/anyone): Eventually we should detect the protocol by looking at PROTOCOL inherited from mcu_selection.mk:
    # info_data['protocol'] = 'V-USB' if rules.get('PROTOCOL') == 'VUSB' else 'LUFA'

    return info_data


def unknown_processor_rules(info_data, rules):
    """Setup the default keyboard info for unknown boards.
    """
    info_data['bootloader'] = 'unknown'
    info_data['platform'] = 'unknown'
    info_data['processor'] = 'unknown'
    info_data['processor_type'] = 'unknown'
    info_data['protocol'] = 'unknown'

    return info_data


def merge_info_jsons(keyboard, info_data):
    """Return a merged copy of all the info.json files for a keyboard.
    """
    for info_file in find_info_json(keyboard):
        # Load and validate the JSON data
        new_info_data = json_load(info_file)

        if not isinstance(new_info_data, dict):
            _log_error(info_data, "Invalid file %s, root object should be a dictionary." % (str(info_file),))
            continue

        try:
            keyboard_validate(new_info_data)
        except jsonschema.ValidationError as e:
            json_path = '.'.join([str(p) for p in e.absolute_path])
            cli.log.error('Not including data from file: %s', info_file)
            cli.log.error('\t%s: %s', json_path, e.message)
            continue

        # Merge layout data in
        if 'layout_aliases' in new_info_data:
            info_data['layout_aliases'] = {**info_data.get('layout_aliases', {}), **new_info_data['layout_aliases']}
            del new_info_data['layout_aliases']

        for layout_name, layout in new_info_data.get('layouts', {}).items():
            if layout_name in info_data.get('layout_aliases', {}):
                _log_warning(info_data, f"info.json uses alias name {layout_name} instead of {info_data['layout_aliases'][layout_name]}")
                layout_name = info_data['layout_aliases'][layout_name]

            if layout_name in info_data['layouts']:
                for new_key, existing_key in zip(layout['layout'], info_data['layouts'][layout_name]['layout']):
                    existing_key.update(new_key)
            else:
                layout['c_macro'] = False
                info_data['layouts'][layout_name] = layout

        # Update info_data with the new data
        if 'layouts' in new_info_data:
            del new_info_data['layouts']

        deep_update(info_data, new_info_data)

    return info_data


def find_info_json(keyboard):
    """Finds all the info.json files associated with a keyboard.
    """
    # Find the most specific first
    base_path = Path('keyboards')
    keyboard_path = base_path / keyboard
    keyboard_parent = keyboard_path.parent
    info_jsons = [keyboard_path / 'info.json']

    # Add DEFAULT_FOLDER before parents, if present
    rules = rules_mk(keyboard)
    if 'DEFAULT_FOLDER' in rules:
        info_jsons.append(Path(rules['DEFAULT_FOLDER']) / 'info.json')

    # Add in parent folders for least specific
    for _ in range(5):
        info_jsons.append(keyboard_parent / 'info.json')
        if keyboard_parent.parent == base_path:
            break
        keyboard_parent = keyboard_parent.parent

    # Return a list of the info.json files that actually exist
    return [info_json for info_json in info_jsons if info_json.exists()]
