// Copyright 2020 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

use {
    crate::utils::{self, Either, WatchOrSetResult},
    anyhow::format_err,
    fidl_fuchsia_settings::{
        DeviceState, DeviceType, InputDeviceSettings, InputProxy, InputState, Microphone,
    },
};

// TODO(fxbug.dev/65686): Remove when clients are ported to new interface.
pub async fn command(proxy: InputProxy, mic_muted: Option<bool>) -> WatchOrSetResult {
    let mut input_settings = InputDeviceSettings::EMPTY;
    let mut microphone = Microphone::EMPTY;

    if mic_muted.is_some() {
        microphone.muted = mic_muted;
        input_settings.microphone = Some(microphone);
    }

    Ok(if input_settings == InputDeviceSettings::EMPTY {
        Either::Watch(utils::watch_to_stream(proxy, |p| p.watch()))
    } else {
        Either::Set(if let Err(err) = proxy.set(input_settings).await? {
            format!("{:?}", err)
        } else if let Some(muted) = mic_muted {
            format!("Successfully set mic mute to {:?}\n", muted)
        } else {
            unreachable!()
        })
    })
}

// Used to interact with the new input interface.
// TODO(fxbug.dev/66186): Support multiple devices.
pub async fn command2(
    proxy: InputProxy,
    device_type: Option<DeviceType>,
    device_name: Option<String>,
    device_state: Option<DeviceState>,
) -> WatchOrSetResult {
    let mut input_states = Vec::new();
    let mut input_state = InputState::EMPTY;

    if let Some(device_type) = device_type {
        input_state.device_type = Some(device_type);
    }
    if let Some(device_name) = device_name.clone() {
        input_state.name = Some(device_name);
    }
    if let Some(device_state) = device_state.clone() {
        input_state.state = Some(device_state);
    }

    Ok(if input_state == InputState::EMPTY {
        Either::Watch(utils::watch_to_stream(proxy, |p| p.watch2()))
    } else {
        if device_type.is_none() {
            return Err(format_err!("Device type required"));
        }
        if device_state.is_none() {
            return Err(format_err!("Device state required"));
        }
        if device_name.is_none() {
            // Default device names.
            input_state.name = match device_type.unwrap() {
                DeviceType::Camera => Some("camera".to_string()),
                DeviceType::Microphone => Some("microphone".to_string()),
            };
        }
        input_states.push(input_state);
        let mut states = input_states.iter().map(|state| state.clone());
        Either::Set(if let Err(err) = proxy.set_states(&mut states).await? {
            format!("{:?}", err)
        } else {
            format!("Successfully set input states to {:#?}\n", input_states)
        })
    })
}