use std::cmp::Ordering;
use std::str::FromStr;
use rust_decimal::{Decimal};
use rust_decimal::prelude::FromPrimitive;
use serde_json::Value;
use tokio::time::Instant;
use tracing::{error};
use crate::public_params;
use crate::model::{Account, MarketOrder, Order, Position, PositionModeEnum, SpecialDepth, SpecialOrder, SpecialTicker};
use crate::response_base::ResponseData;
use crate::trace_stack::TraceStack;

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct DepthParam {
    pub depth_asks: Vec<MarketOrder>,
    pub depth_bids: Vec<MarketOrder>,
    pub t: Decimal,
    pub create_at: i64
}

// 处理账号信息
pub fn handle_account_info(res_data: &ResponseData, symbol: &String) -> Account {
    let res_data_json = res_data.data.as_array().unwrap();
    format_account_info(res_data_json, symbol)
}

pub fn format_account_info(data: &Vec<Value>, symbol: &String) -> Account {
    let symbol_upper = symbol.to_uppercase();
    let symbol_array: Vec<&str> = symbol_upper.split("_").collect();
    let balance_info = data.iter().find(|&item| item["text"].as_str().unwrap().contains(&symbol_upper));
    match balance_info {
        None => {
            error!("Gate：格式化账号信息错误!\nformat_account_info: data={:?}", data);
            panic!("Gate：格式化账号信息错误!\nformat_account_info: data={:?}", data)
        }
        Some(value) => {
            let balance = Decimal::from_str(&value["balance"].as_f64().unwrap().to_string()).unwrap();
            Account {
                coin: symbol_array[1].to_string(),
                balance,
                available_balance: Decimal::ZERO,
                frozen_balance: Decimal::ZERO,
                stocks: Decimal::ZERO,
                available_stocks: Decimal::ZERO,
                frozen_stocks: Decimal::ZERO,
            }
        }
    }
}

// 处理position信息
pub fn handle_position(res_data: &ResponseData, ct_val: &Decimal) -> Vec<Position> {
    let res_data_json = res_data.data.as_array().unwrap();
    res_data_json.iter().map(|item| { format_position_item(item, ct_val) }).collect()
}

pub fn format_position_item(position: &Value, ct_val: &Decimal) -> Position {
    let mut position_mode = match position["mode"].as_str().unwrap_or("") {
        "single" => PositionModeEnum::Both,
        "dual_long" => PositionModeEnum::Long,
        "dual_short" => PositionModeEnum::Short,
        _ => {
            error!("Gate：格式化持仓模式错误！\nformat_position_item:position={:?}", position);
            panic!("Gate：格式化持仓模式错误！\nformat_position_item:position={:?}", position)
        }
    };
    let size = Decimal::from_str(&position["size"].as_f64().unwrap().to_string()).unwrap();
    let amount = size * ct_val;
    match position_mode {
        PositionModeEnum::Both => {
            position_mode = match amount {
                amount if amount > Decimal::ZERO => PositionModeEnum::Long,
                amount if amount < Decimal::ZERO => PositionModeEnum::Short,
                _ => { PositionModeEnum::Both }
            }
        }
        _ => {}
    }
    Position {
        symbol: position["contract"].as_str().unwrap().to_string(),
        margin_level: Decimal::from_str(&position["leverage"].as_f64().unwrap().to_string()).unwrap(),
        amount,
        frozen_amount: Decimal::ZERO,
        price: Decimal::from_str(&position["entry_price"].as_f64().unwrap().to_string()).unwrap(),
        profit: Decimal::from_str(&position["realised_pnl"].as_f64().unwrap().to_string()).unwrap(),
        position_mode,
        margin: Decimal::from_str(&position["margin"].as_f64().unwrap().to_string()).unwrap(),
    }
}

// 处理order信息
pub fn handle_order(res_data: ResponseData, ct_val: Decimal) -> SpecialOrder {
    let res_data_json = res_data.data.as_array().unwrap();
    let mut order_info = Vec::new();
    for item in res_data_json.iter() {
        order_info.push(format_order_item(item.clone(), ct_val));
    };

    SpecialOrder {
        name: res_data.label,
        order: order_info,
    }
}

pub fn format_order_item(order: serde_json::Value, ct_val: Decimal) -> Order {
    let status = order["status"].as_str().unwrap_or("");
    let text = order["text"].as_str().unwrap_or("");
    let size = Decimal::from_f64(order["size"].as_f64().unwrap()).unwrap();
    let left = Decimal::from_f64(order["left"].as_f64().unwrap()).unwrap();

    let amount = size * ct_val;
    let deal_amount = (size - left) * ct_val;
    let custom_status = if status == "finished" { "REMOVE".to_string() } else if status == "open" { "NEW".to_string() } else {
        error!("Gate：格式化订单状态错误！\nformat_order_item:order={:?}", order);
        panic!("Gate：格式化订单状态错误！\nformat_order_item:order={:?}", order)
    };
    let rst_order = Order {
        id: order["id"].to_string(),
        custom_id: text.replace("t-my-custom-id_", "").replace("t-", ""),
        price: Decimal::from_f64(order["price"].as_f64().unwrap()).unwrap(),
        amount,
        deal_amount,
        avg_price: Decimal::from_f64(order["fill_price"].as_f64().unwrap()).unwrap(),
        status: custom_status,
        order_type: "limit".to_string(),
        trace_stack: TraceStack::new(0, Instant::now()).on_special("120 gate_handle".to_string()),
    };

    return rst_order;
}
// 处理特殊Ticket信息
pub fn handle_book_ticker(res_data: &ResponseData) -> SpecialDepth {
    let bp = Decimal::from_str((*res_data).data["b"].as_str().unwrap_or("0")).unwrap_or(Decimal::ZERO);
    let bq = Decimal::from_f64((*res_data).data["B"].as_f64().unwrap()).unwrap();
    let ap = Decimal::from_str((*res_data).data["a"].as_str().unwrap_or("0")).unwrap_or(Decimal::ZERO);
    let aq = Decimal::from_f64((*res_data).data["A"].as_f64().unwrap()).unwrap();
    let mp = (bp + ap) * Decimal::from_str("0.5").unwrap();
    let t = Decimal::from_u64((*res_data).data["u"].as_u64().unwrap()).unwrap();
    let create_at = (*res_data).data["t"].as_i64().unwrap() * 1000;

    let ticker_info = SpecialTicker { sell: ap, buy: bp, mid_price: mp, t, create_at };
    // 最佳买方的价格, 最佳买方的数量, 最佳卖方的价格, 最佳卖方的数量        
    let depth_info = vec![bp, bq, ap, aq];

    SpecialDepth {
        name: (*res_data).label.clone(),
        depth: depth_info,
        ticker: ticker_info,
        t,
        create_at,
    }
}

pub fn format_depth_items(value: &Value) -> Vec<MarketOrder> {
    let mut depth_items: Vec<MarketOrder> = vec![];
    for value in value.as_array().unwrap() {
        depth_items.push(MarketOrder {
            price: Decimal::from_str(value["p"].as_str().unwrap()).unwrap(),
            amount: Decimal::from_f64(value["s"].as_f64().unwrap()).unwrap(),
        })
    }
    depth_items
}

// 处理深度信息
pub fn handle_special_depth(res_data: &ResponseData) -> SpecialDepth {
    let label = res_data.label.clone();
    // 格式化
    let mut format_depth = format_depth(res_data);
    // 运算、组装
    make_special_depth(label, &mut format_depth.depth_asks, &mut format_depth.depth_bids, format_depth.t, format_depth.create_at)
}

pub fn format_depth(res_data: &ResponseData) -> DepthParam {

    let depth_asks: Vec<MarketOrder> = format_depth_items(&res_data.data["asks"]);
    let depth_bids: Vec<MarketOrder> = format_depth_items(&res_data.data["bids"]);
    // todo! 有id可以取 保证与py一致
    let t: Decimal = Decimal::from_str(&res_data.data["t"].to_string()).unwrap();
    let create_at: i64 = res_data.data["t"].as_i64().unwrap() * 1000;


    DepthParam {
        depth_asks,
        depth_bids,
        t,
        create_at
    }
}

pub fn make_special_depth(label: String, depth_asks: &mut Vec<MarketOrder>, depth_bids: &mut Vec<MarketOrder>, t: Decimal, create_at: i64) -> SpecialDepth {
    depth_asks.sort_by(|a, b| a.price.partial_cmp(&b.price).unwrap_or(Ordering::Equal));
    depth_bids.sort_by(|a, b| b.price.partial_cmp(&a.price).unwrap_or(Ordering::Equal));
    // TODO 不排序的话，有4us可以省下来。
    let mp = (depth_asks[0].price + depth_bids[0].price) * Decimal::from_str("0.5").unwrap();
    // 每1权重需要多少价格距离，0.001代表0.1%，每0.1%代表1权重 0.001
    let step = (Decimal::new(1, 3) * mp / Decimal::from_usize(public_params::LEVEL).unwrap()).round_dp(mp.scale());
    let mut ap = Vec::new();
    let mut bp = Vec::new();
    let mut av: Vec<Decimal> = Vec::new();
    let mut bv: Vec<Decimal> = Vec::new();
    for i in 0..public_params::LEVEL {
        let price = (depth_asks[0].price + step * Decimal::from_f64(i as f64).unwrap()).round_dp(depth_asks[0].price.scale());
        ap.push(price);
    }
    for i in 0..public_params::LEVEL {
        let price = (depth_bids[0].price - step * Decimal::from_f64(i as f64).unwrap()).round_dp(depth_bids[0].price.scale());
        bp.push(price);
    }
    let mut ap_price_tag = depth_asks[0].price + step;
    let mut ap_index = 0;
    for item in depth_asks.iter() {
        let price = item.price;
        let amount = item.amount;
        if av.get(ap_index).is_none() { av.push(Decimal::ZERO) };
        if price < ap_price_tag {
            av[ap_index] += amount;
        } else {
            ap_price_tag += step;
            ap_index += 1;
            if ap_index == public_params::LEVEL {
                break;
            }
            av[ap_index] += amount
        }
    }

    let mut bp_price_tag = depth_bids[0].price - step;
    let mut bp_index = 0;
    for item in depth_bids.iter() {
        let price = item.price;
        let amount = item.amount;
        if bv.get(bp_index).is_none() { bv.push(Decimal::ZERO) };
        if price > bp_price_tag {
            bv[bp_index] += amount;
        } else {
            bp_price_tag -= step;
            bp_index += 1;
            if bp_index == public_params::LEVEL {
                break;
            }
            bv[bp_index] += amount
        }
    }

    let ticker_info = SpecialTicker { sell: depth_asks[0].price, buy: depth_bids[0].price, mid_price: mp, t, create_at };
    let depth_info = bp.iter().cloned().chain(bv.iter().cloned()).chain(ap.iter().cloned()).chain(av.iter().cloned()).collect();
    SpecialDepth {
        name: label,
        depth: depth_info,
        ticker: ticker_info,
        t,
        create_at,
    }
}