use matrix_sdk::ruma::events::room::message::RoomMessageEventContent;
use meshtastic::api::state::Connected;
use meshtastic::api::{ConnectedStreamApi, StreamApi};
use meshtastic::protobufs::{from_radio::PayloadVariant, FromRadio};
use meshtastic::protobufs::{mesh_packet, Data};
use meshtastic::utils::{self, generate_rand_id};
use tokio::sync::mpsc::error::SendError;
use tokio::sync::mpsc::{Sender, UnboundedReceiver};

use crate::config;

pub struct MeshtasticClient {
    decoded_listener: UnboundedReceiver<FromRadio>,
    stream_api: ConnectedStreamApi<Connected>,
}

pub(crate) async fn build(
    config: config::MeshtasticConfig,
) -> Result<MeshtasticClient, Box<dyn std::error::Error>> {
    let stream_api = StreamApi::new();
    let serial_stream = utils::stream::build_serial_stream(config.device, None, None, None)?;
    let (decoded_listener, stream_api) = stream_api.connect(serial_stream).await;

    log::info!("connected to meshtastic device");

    Ok(MeshtasticClient {
        decoded_listener: decoded_listener,
        stream_api: stream_api,
    })
}

impl MeshtasticClient {
    pub async fn receive(
        mut self: MeshtasticClient,
        matrix_sender: Sender<RoomMessageEventContent>,
    ) -> Result<(), Box<dyn std::error::Error>> {
        // let config_id = utils::generate_rand_id();
        // let stream_api = stream_api.configure(config_id).await?;

        // This loop can be broken with ctrl+c, or by disconnecting
        // the attached serial port.

        self.stream_api.configure(generate_rand_id()).await?;

        log::debug!("listening for messages from meshtastic");
        while let Some(packet) = self.decoded_listener.recv().await {
            let payload_variant = match packet.payload_variant {
                Some(payload_variant) => payload_variant,
                None => {
                    log::debug!(
                        "Received FromRadio packet with no payload variant, not handling..."
                    );
                    continue;
                }
            };

            match payload_variant {
                PayloadVariant::Packet(packet) => {
                    let payload_variant = match &packet.payload_variant {
                        Some(payload_variant) => payload_variant,
                        None => {
                            log::debug!(
                                "Received MeshPacket with no payload variant, not handling..."
                            );
                            return Ok(());
                        }
                    };

                    match payload_variant {
                        mesh_packet::PayloadVariant::Decoded(decoded) => {
                            handle_decoded_packet(&matrix_sender, &packet, decoded).await?;
                        }
                        mesh_packet::PayloadVariant::Encrypted(encrypted) => {
                            log::debug!(
                                "received encrypted packet (decryption not yet supported): {:?}",
                                encrypted
                            );
                        }
                    };
                }
                PayloadVariant::MyInfo(my_node_info) => {
                    debug_message(
                        &matrix_sender,
                        format!("I'm alive! MyInfo: {:?}", my_node_info),
                    )
                    .await?
                }
                PayloadVariant::LogRecord(record) => {
                    log::info!(
                        "[meshtastic] {} [{}] [{}] {}",
                        record.level,
                        record.time,
                        record.source,
                        record.message
                    )
                }
                PayloadVariant::Channel(channel) => {
                    log::debug!("Channel: {:?}", channel);
                }
                // PayloadVariant::NodeInfo(node_info) => {
                //     upsert_remote_node(db, node_info).await?
                // }
                // PayloadVariant::Decoded(decoded) => {
                //     debug_message(&matrix_sender, format!("Decoded: {:?}", decoded))
                // }
                _ => log::debug!("dropping unknown packet"),
            }
        }

        Ok(())
    }
}

async fn handle_decoded_packet(
    matrix_sender: &Sender<RoomMessageEventContent>,
    packet: &meshtastic::protobufs::MeshPacket,
    decoded: &Data,
) -> Result<(), Box<dyn std::error::Error>> {
    match decoded.portnum() {
        meshtastic::protobufs::PortNum::TextMessageApp => {
            log::debug!("posting packet to matrix: {:?}", packet);
            log::debug!("decoded: {:?}", decoded);

            let message = format!(
                "text from {:02x}: {} (snr: {}, rssi: {}, hop limit: {}, hop start: {})",
                packet.from,
                std::str::from_utf8(&decoded.payload)?,
                packet.rx_snr,
                packet.rx_rssi,
                packet.hop_limit,
                packet.hop_start
            );

            debug_message(&matrix_sender, message).await?;
        }
        _ => log::debug!(
            "dropping packet we havent implemented support for ({})",
            decoded.portnum().as_str_name()
        ),
    }

    Ok(())
}

async fn debug_message(
    matrix_sender: &Sender<RoomMessageEventContent>,
    message: String,
) -> Result<(), SendError<RoomMessageEventContent>> {
    log::debug!("[mashtastic]: received {}", message);

    matrix_sender
        .send(RoomMessageEventContent::text_plain(message))
        .await
}