use tracing::{info, warn};
use crate::data_providers::{deserialize_string_to_f32, SpawnExecutor};
use crate::data_providers::deserialize_string_to_i64;
use std::collections::HashMap;
use std::vec;
use bytes::Bytes;
use iced::{
    stream, 
    futures::{sink::SinkExt, Stream},
};

use regex::Regex;
use serde_json::json;
use serde_json::Value;

use sonic_rs::{Deserialize, JsonValueTrait, Serialize};
use sonic_rs::to_object_iter_unchecked;

use fastwebsockets::{Frame, FragmentCollector, OpCode};
use http_body_util::Empty;
use hyper::header::{CONNECTION, UPGRADE};
use hyper::Request;
use hyper::upgrade::Upgraded;
use hyper_util::rt::TokioIo;
use tokio::net::TcpStream;
use crate::data_providers::{
    Connection, Event, Kline, LocalDepthCache, MarketType, Order, State, 
    StreamError, TickerInfo, TickerStats, Trade, VecLocalDepthCache,
};
use crate::{Ticker, Timeframe};

use super::str_f32_parse;
use super::OpenInterest;

use tracing::{error};

#[derive(Serialize, Deserialize, Debug)]
struct SonicDepth {
    #[serde(rename = "time")]
    pub update_id: u64,
    #[serde(rename = "bids")]
    pub bids: Vec<BidAsk>,
    #[serde(rename = "asks")]
    pub asks: Vec<BidAsk>,
}

#[derive(Serialize, Deserialize, Debug)]
struct BidAsk {
    #[serde(rename = "0")]
    pub price: String,
    #[serde(rename = "1")]
    pub qty: String,
}

#[derive(Serialize, Deserialize, Debug)]
struct SonicTrade {
    #[serde(rename = "time")]
    pub time: u64,
    #[serde(rename = "last_price")]
    pub price: String,
    #[serde(rename = "last_qty")]
    pub qty: String,
    #[serde(rename = "side")]
    pub side: String,
}

#[derive(Debug)]
enum StreamData {
    Trade(Vec<SonicTrade>),
    Depth(SonicDepth, i64),
    // Kline(Ticker, Vec<SonicKline>),
}

#[allow(unused_assignments)]
fn feed_de(
    slice: &[u8]
) -> Result<Vec<StreamData>, StreamError> {
    // // 这里应该是做缓存，之前的bybit数据推送是增量的
    // let mut depth_wrap: Option<SonicDepth> = None;

    let iter: sonic_rs::ObjectJsonIter = unsafe { to_object_iter_unchecked(slice) };
    let mut trade = SonicTrade {
        time: 0,
        price: "".to_string(),
        qty: "".to_string(),
        side: "".to_string(),
    };
    let mut depth = SonicDepth {
        update_id: 0,
        bids: vec![],
        asks: vec![],
    };

    for elem in iter {
        let (k, v) = elem.map_err(|e| StreamError::ParseError(e.to_string()))?;
        // let v = &v.as_raw_faststr();
        match k.as_str() {
            "time" => {
                let t: u64 = v.as_u64().unwrap();

                trade.time = t;
                depth.update_id = t;
            }
            "last_price" => {
                trade.price = v.to_string();
            }
            "last_qty" => {
                trade.qty = v.to_string();
            }
            "side" => {
                trade.side = v.to_string();
            }
            "asks" => {
                let asks = serde_json::from_slice::<Value>(v.as_raw_str().as_bytes())
                    .unwrap();

                for ask in asks.as_array().unwrap() {
                    let order_book = BidAsk {
                        price: ask.as_array().unwrap()[0].to_string(),
                        qty: ask.as_array().unwrap()[1].to_string(),
                    };

                    depth.asks.push(order_book);
                }
            }
            "bids" => {
                let bids = serde_json::from_slice::<Value>(v.as_raw_str().as_bytes())
                    .unwrap();

                for bid in bids.as_array().unwrap() {
                    let order_book = BidAsk {
                        price: bid.as_array().unwrap()[0].to_string(),
                        qty: bid.as_array().unwrap()[1].to_string(),
                    };

                    depth.bids.push(order_book);
                }
            }
            &_ => {}
        }
    }

    let update_id = depth.update_id;
    Ok(vec![StreamData::Trade(vec![trade]), StreamData::Depth(depth, update_id as i64)])
}

async fn connect() -> Result<FragmentCollector<TokioIo<Upgraded>>, StreamError> {
    let url = "ws://localhost:6789";
    let addr = "localhost:6789";
    let stream = TcpStream::connect(&addr).await
        .map_err(|e| StreamError::WebsocketError(e.to_string()))?;

    // 2. 构建 WebSocket 握手请求
    let req = Request::builder()
        .method("GET")
        .uri(url)
        .header("Host", "localhost")
        .header(UPGRADE, "websocket")
        .header(CONNECTION, "upgrade")
        .header("Sec-WebSocket-Key", fastwebsockets::handshake::generate_key())
        .header("Sec-WebSocket-Version", "13")
        .header("Sec-WebSocket-Protocol", "rust-websocket") // 可选协议
        .header("User-Agent", "rust-client/1.0") // 添加 UA 头
        .body(Empty::<Bytes>::new())
        .map_err(|e| StreamError::WebsocketError(e.to_string()))?;

    let (ws, _) = fastwebsockets::handshake::client(&SpawnExecutor, req, stream)
        .await
        .map_err(|e| StreamError::WebsocketError(e.to_string()))?;

    Ok(FragmentCollector::new(ws))
}

async fn try_connect(
    streams: &Value,
    output: &mut futures::channel::mpsc::Sender<Event>,
) -> State {
    match connect().await {
        Ok(mut websocket) => {
            if let Err(e) = websocket
                .write_frame(Frame::text(fastwebsockets::Payload::Borrowed(
                    streams.to_string().as_bytes(),
                )))
                .await
            {
                let _ = output
                    .send(Event::Disconnected(format!("Failed subscribing: {e}")))
                    .await;
                return State::Disconnected;
            }

            let _ = output.send(Event::Connected(Connection)).await;
            State::Connected(websocket)
        }
        Err(err) => {
            tokio::time::sleep(tokio::time::Duration::from_secs(1)).await;

            let _ = output
                .send(Event::Disconnected(format!("Failed to connect: {err}")))
                .await;
            State::Disconnected
        }
    }
}

pub fn connect_market_stream(ticker: Ticker) -> impl Stream<Item = Event> {
    stream::channel(100, move |mut output| async move {
        let mut state: State = State::Disconnected;

        let (symbol_str, market_type) = ticker.get_string();

        let stream_1 = format!("publicTrade.{symbol_str}");
        let stream_2 = format!(
            "orderbook.{}.{}",
            match market_type {
                MarketType::Spot => "200",
                MarketType::LinearPerps => "500",
            },
            symbol_str,
        );

        let subscribe_message = json!({
            "op": "subscribe",
            "args": [stream_1, stream_2]
        });

        let mut trades_buffer: Vec<Trade> = Vec::new();
        let mut orderbook = LocalDepthCache::new();

        loop {
            match &mut state {
                State::Disconnected => {
                    state = try_connect(
                        &subscribe_message,
                        &mut output
                    ).await;
                }
                State::Connected(websocket) => match websocket.read_frame().await {
                    Ok(msg) => match msg.opcode {
                        OpCode::Text => {
                            let result = feed_de(&msg.payload[..]);
                            match result {
                                Ok(data_vec) => {
                                    let trade_handle_rst = &data_vec[0];
                                    let depth_handle_rst = &data_vec[1];

                                    match trade_handle_rst {
                                        StreamData::Trade(de_trade_vec) => {
                                            for de_trade in de_trade_vec {
                                                let trade = Trade {
                                                    time: de_trade.time as i64,
                                                    is_sell: de_trade.side == "sell",
                                                    price: str_f32_parse(&de_trade.price),
                                                    qty: str_f32_parse(&de_trade.qty),
                                                };

                                                trades_buffer.push(trade);
                                            }
                                        }
                                        StreamData::Depth(_, _) => {}
                                    }

                                    match depth_handle_rst {
                                        StreamData::Depth(de_depth, time) => {
                                            let t = time.clone();

                                            let depth_update = VecLocalDepthCache {
                                                last_update_id: de_depth.update_id as i64,
                                                time: t,
                                                bids: de_depth
                                                    .bids
                                                    .iter()
                                                    .map(|x| Order {
                                                        price: str_f32_parse(&x.price),
                                                        qty: str_f32_parse(&x.qty),
                                                    })
                                                    .collect(),
                                                asks: de_depth
                                                    .asks
                                                    .iter()
                                                    .map(|x| Order {
                                                        price: str_f32_parse(&x.price),
                                                        qty: str_f32_parse(&x.qty),
                                                    })
                                                    .collect(),
                                            };

                                            orderbook.fetched(&depth_update);
                                        }

                                        StreamData::Trade(_) => {}
                                    }
                                }
                                Err(e) => {
                                    // 处理错误
                                    error!("处理数据失败: {}", e);
                                }
                            }

                        }
                        OpCode::Close => {
                            state = State::Disconnected;
                            let _ = output
                                .send(Event::Disconnected("Connection closed".to_string()))
                                .await;
                        }
                        _ => {}
                    },
                    Err(e) => {
                        state = State::Disconnected;
                        let _ = output
                            .send(Event::Disconnected(
                                "Error reading frame: ".to_string() + &e.to_string(),
                            ))
                            .await;
                    }
                },
            }
        }
    })
}

// fn string_to_timeframe(interval: &str) -> Option<Timeframe> {
//     Timeframe::ALL
//         .iter()
//         .find(|&tf| tf.to_minutes().to_string() == interval)
//         .copied()
// }

#[derive(Debug, Clone, Copy, PartialEq, Deserialize)]
#[serde(rename_all = "camelCase")]
struct DeOpenInterest {
    #[serde(rename = "openInterest", deserialize_with = "deserialize_string_to_f32")]
    pub value: f32,
    #[serde(deserialize_with = "deserialize_string_to_i64")]
    pub timestamp: i64,
}

pub async fn fetch_historical_oi(
    ticker: Ticker, 
    range: Option<(i64, i64)>,
    period: Timeframe,
) -> Result<Vec<OpenInterest>, StreamError> {
    let ticker_str = ticker.get_string().0.to_uppercase();
    let period_str = match period {
        Timeframe::M5 => "5min",
        Timeframe::M15 => "15min",
        Timeframe::M30 => "30min",
        Timeframe::H1 => "1h",
        Timeframe::H2 => "2h",
        Timeframe::H4 => "4h",
        _ => {
            let err_msg = format!("Unsupported timeframe for open interest: {}", period);
            error!("{}", err_msg);
            return Err(StreamError::UnknownError(err_msg));
        }
    };

    let mut url = format!(
        "https://api.bybit.com/v5/market/open-interest?category=linear&symbol={}&intervalTime={}",
        ticker_str, period_str,
    );

    if let Some((start, end)) = range {
        let interval_ms = period.to_milliseconds() as i64;
        let num_intervals = ((end - start) / interval_ms).min(200);

        if num_intervals > 1 {
            url.push_str(&format!(
                "&startTime={start}&endTime={end}&limit={num_intervals}"
            ));
        } else {
            url.push_str("&limit=200");
        }
    } else {
        url.push_str("&limit=200");
    }

    let response = reqwest::get(&url)
        .await
        .map_err(|e| {
            error!("Failed to fetch from {}: {}", url, e);
            StreamError::FetchError(e)
        })?;
        
    let text = response.text()
        .await
        .map_err(|e| {
            error!("Failed to get response text from {}: {}", url, e);
            StreamError::FetchError(e)
        })?;

    let content: Value = sonic_rs::from_str(&text)
        .map_err(|e| {
            error!("Failed to parse JSON from {}: {}\nResponse: {}", url, e, text);
            StreamError::ParseError(e.to_string())
        })?;

    let result_list = content["result"]["list"]
        .as_array()
        .ok_or_else(|| {
            error!("Result list is not an array in response: {}", text);
            StreamError::ParseError("Result list is not an array".to_string())
        })?;
    
    let bybit_oi: Vec<DeOpenInterest> = serde_json::from_value(json!(result_list))
        .map_err(|e| {
            error!("Failed to parse open interest array: {}\nResponse: {}", e, text);
            StreamError::ParseError(format!("Failed to parse open interest: {e}"))
        })?;

    let open_interest: Vec<OpenInterest> = bybit_oi
        .into_iter()
        .map(|x| OpenInterest {
            time: x.timestamp,
            value: x.value,
        })
        .collect();

    if open_interest.is_empty() {
        warn!("No open interest data found for {}, from url: {}", ticker_str, url);
    }

    Ok(open_interest)
}

#[allow(dead_code)]
#[derive(Deserialize, Debug)]
struct ApiResponse {
    #[serde(rename = "retCode")]
    ret_code: u32,
    #[serde(rename = "retMsg")]
    ret_msg: String,
    result: ApiResult,
}

#[allow(dead_code)]
#[derive(Deserialize, Debug)]
struct ApiResult {
    symbol: String,
    category: String,
    list: Vec<Vec<Value>>,
}

pub async fn fetch_klines(
    ticker: Ticker,
    timeframe: Timeframe,
    range: Option<(i64, i64)>,
) -> Result<Vec<Kline>, StreamError> {
    let (symbol_str, market_type) = &ticker.get_string();
    let timeframe_str = timeframe.to_minutes().to_string();

    fn parse_kline_field<T: std::str::FromStr>(field: Option<&str>) -> Result<T, StreamError> {
        field
            .ok_or_else(|| StreamError::ParseError("Failed to parse kline".to_string()))
            .and_then(|s| {
                s.parse::<T>()
                    .map_err(|_| StreamError::ParseError("Failed to parse kline".to_string()))
            })
    }

    let market = match market_type {
        MarketType::Spot => "spot",
        MarketType::LinearPerps => "linear",
    };

    let mut url = format!(
        "https://api.bybit.com/v5/market/kline?category={}&symbol={}&interval={}",
        market, symbol_str.to_uppercase(), timeframe_str
    );

    if let Some((start, end)) = range {
        let interval_ms = timeframe.to_milliseconds() as i64;
        let num_intervals = ((end - start) / interval_ms).min(1000);

        url.push_str(&format!("&start={start}&end={end}&limit={num_intervals}"));
    } else {
        url.push_str(&format!("&limit={}", 200));
    }

    let response: reqwest::Response = reqwest::get(&url).await.map_err(StreamError::FetchError)?;
    let text = response.text().await.map_err(StreamError::FetchError)?;

    let api_response: ApiResponse =
        sonic_rs::from_str(&text).map_err(|e| StreamError::ParseError(e.to_string()))?;

    let klines: Result<Vec<Kline>, StreamError> = api_response
        .result
        .list
        .iter()
        .map(|kline| {
            let time = parse_kline_field::<u64>(kline[0].as_str())?;
            let open = parse_kline_field::<f32>(kline[1].as_str())?;
            let high = parse_kline_field::<f32>(kline[2].as_str())?;
            let low = parse_kline_field::<f32>(kline[3].as_str())?;
            let close = parse_kline_field::<f32>(kline[4].as_str())?;
            let volume = parse_kline_field::<f32>(kline[5].as_str())?;

            Ok(Kline {
                time,
                open,
                high,
                low,
                close,
                volume: (-1.0, volume),
            })
        })
        .collect();

    klines
}

pub async fn fetch_ticksize(market_type: MarketType) -> Result<HashMap<Ticker, Option<TickerInfo>>, StreamError> {
    let market = match market_type {
        MarketType::Spot => "spot",
        MarketType::LinearPerps => "linear",
    };

    let url = format!("https://api.bybit.com/v5/market/instruments-info?category={market}");
    let response = reqwest::get(&url).await.map_err(StreamError::FetchError)?;
    let text = response.text().await.map_err(StreamError::FetchError)?;

    let exchange_info: Value =
        sonic_rs::from_str(&text).map_err(|e| StreamError::ParseError(e.to_string()))?;

    let result_list: &Vec<Value> = exchange_info["result"]["list"]
        .as_array()
        .ok_or_else(|| StreamError::ParseError("Result list is not an array".to_string()))?;

    let mut ticker_info_map = HashMap::new();

    let re = Regex::new(r"^[a-zA-Z0-9]+$").unwrap();

    for item in result_list {
        let symbol = item["symbol"]
            .as_str()
            .ok_or_else(|| StreamError::ParseError("Symbol not found".to_string()))?;

        if !re.is_match(symbol) {
            continue;
        }

        let price_filter = item["priceFilter"]
            .as_object()
            .ok_or_else(|| StreamError::ParseError("Price filter not found".to_string()))?;

        let min_ticksize = price_filter["tickSize"]
            .as_str()
            .ok_or_else(|| StreamError::ParseError("Tick size not found".to_string()))?
            .parse::<f32>()
            .map_err(|_| StreamError::ParseError("Failed to parse tick size".to_string()))?;

        let ticker = Ticker::new(symbol, market_type);

        ticker_info_map.insert(ticker, Some(TickerInfo { min_ticksize, ticker }));
    }

    Ok(ticker_info_map)
}

pub async fn fetch_ticker_prices(market_type: MarketType) -> Result<HashMap<Ticker, TickerStats>, StreamError> {
    let market = match market_type {
        MarketType::Spot => "spot",
        MarketType::LinearPerps => "linear",
    };

    let url = format!("https://api.bybit.com/v5/market/tickers?category={market}");
    let response = reqwest::get(&url).await.map_err(StreamError::FetchError)?;
    let text = response.text().await.map_err(StreamError::FetchError)?;

    let exchange_info: Value =
        sonic_rs::from_str(&text).map_err(|e| StreamError::ParseError(e.to_string()))?;

    let result_list: &Vec<Value> = exchange_info["result"]["list"]
        .as_array()
        .ok_or_else(|| StreamError::ParseError("Result list is not an array".to_string()))?;

    let mut ticker_prices_map = HashMap::new();

    let re = Regex::new(r"^[a-zA-Z0-9]+$").unwrap();

    for item in result_list {
        let symbol = item["symbol"]
            .as_str()
            .ok_or_else(|| StreamError::ParseError("Symbol not found".to_string()))?;

        if !re.is_match(symbol) {
            continue;
        }

        let mark_price = item["lastPrice"]
            .as_str()
            .ok_or_else(|| StreamError::ParseError("Mark price not found".to_string()))?
            .parse::<f32>()
            .map_err(|_| StreamError::ParseError("Failed to parse mark price".to_string()))?;

        let daily_price_chg = item["price24hPcnt"]
            .as_str()
            .ok_or_else(|| StreamError::ParseError("Daily price change not found".to_string()))?
            .parse::<f32>()
            .map_err(|_| {
                StreamError::ParseError("Failed to parse daily price change".to_string())
            })?;

        let daily_volume = item["volume24h"]
            .as_str()
            .ok_or_else(|| StreamError::ParseError("Daily volume not found".to_string()))?
            .parse::<f32>()
            .map_err(|_| StreamError::ParseError("Failed to parse daily volume".to_string()))?;

        let quote_volume = daily_volume * mark_price;

        if quote_volume < 4_000_000.0 {
            continue;
        }

        let ticker_stats = TickerStats {
            mark_price,
            daily_price_chg: daily_price_chg * 100.0,
            daily_volume: quote_volume,
        };

        ticker_prices_map.insert(Ticker::new(symbol, market_type), ticker_stats);
    }

    Ok(ticker_prices_map)
}