#
# These methods are used to build helper indexes on data structures
#
def build_adc_index(adc_inputs):
    i = 0
    index = {}
    for adc_input in adc_inputs.inputs:
        index[str(adc_input.name)] = i
        i = i + 1

    return index


def append_to_index(d, key, val):
    if key not in d:
        d[key] = []

    d[key].append(val)


def build_adc_gpio_port_index(adc_inputs):
    i = 0
    gpios = {}
    for adc_input in adc_inputs.inputs:
        if str(adc_input.adc) == "SPI":
            continue

        gpio = getattr(adc_input, "gpio", None)
        if gpio is None:
            i = i + 1
            continue

        if gpio not in gpios:
            gpios[gpio] = []

        pin = {"pin": adc_input.pin, "idx": i}

        gpios[gpio].append(pin)
        i = i + 1

    return gpios


def build_switch_gpio_port_index(switches):
    gpios = {}
    for switch in switches:
        sw_type = str(switch.type)

        if sw_type == "2POS" or sw_type == "FSWITCH":
            gpio = switch.gpio
            pin = switch.pin
            if gpio is not None and pin is not None:
                append_to_index(gpios, gpio, pin)

        elif sw_type == "3POS":
            gpio_high = switch.gpio_high
            pin_high = switch.pin_high
            if gpio_high is not None and pin_high is not None:
                append_to_index(gpios, gpio_high, pin_high)

            gpio_low = switch.gpio_low
            pin_low = switch.pin_low
            if gpio_low is not None and pin_low is not None:
                append_to_index(gpios, gpio_low, pin_low)

    return gpios


def build_trim_gpio_port_index(trims):
    def index_contact(gpios, contact):
        gpio = contact["gpio"]
        pin = contact["pin"]
        if gpio and pin:
            append_to_index(gpios, contact["gpio"], contact["pin"])

    gpios = {}
    for trim in trims:
        dec = trim.get("dec")
        inc = trim.get("inc")
        if dec and inc:
            index_contact(gpios, dec)
            index_contact(gpios, inc)

    return gpios


def build_key_gpio_port_index(keys):
    gpios = {}
    for key in keys:
        append_to_index(gpios, key.gpio, key.pin)

    return gpios