use std::collections::HashMap;
use std::str::FromStr;
use std::sync::atomic::{AtomicI64, AtomicU64, Ordering};
use anyhow::{anyhow, bail, Result};
use rust_decimal::Decimal;
use serde_json::Value;
use tracing::{warn};
use crate::utils::response::Response;

#[allow(dead_code)]
pub struct DataManager {
    pub best_ask: Decimal,
    pub best_bid: Decimal,

    // position的数据结构如下，用下划线连接就可以取得position
    // {
    //      "symbol1_side1":{
    //      },
    //      "symbol1_side2":{
    //      },
    //      ..
    // }
    pub extended_position: HashMap<String, Value>,
    pub extended_orders: HashMap<String, Value>,
    pub extended_balance: Value,

    pub delay_total: AtomicI64,
    pub delay_count: AtomicU64,
}

#[allow(dead_code)]
impl DataManager {
    pub fn new() -> Self {
        DataManager {
            best_ask: Default::default(),
            best_bid: Default::default(),

            extended_position: HashMap::new(),
            extended_balance: Default::default(),
            extended_orders: Default::default(),

            delay_total: AtomicI64::new(0),
            delay_count: AtomicU64::new(0),
        }
    }

    pub fn record_latency(&self, received_at: i64, origin_timestamp: i64) {
        if let Some(delay) = received_at.checked_sub(origin_timestamp) {
            self.delay_total.fetch_add(delay, Ordering::Relaxed);       // 原子加
            self.delay_count.fetch_add(1, Ordering::Relaxed);       // 原子加
        } else {
            warn!("时间戳计算出现问题: received_at={}, origin_timestamp={}", received_at, origin_timestamp);
        }
    }

    // 获取当前的统计数据
    pub fn get_delay_stats(&self) -> (i64, u64) {
        let total = self.delay_total.load(Ordering::Relaxed);
        let count = self.delay_count.load(Ordering::Relaxed);
        (total, count)
    }

    // 重置统计数据 -> 这个是关键！
    pub fn reset_delay_stats(&self) {
        self.delay_total.store(0, Ordering::Relaxed); // 原子写
        self.delay_count.store(0, Ordering::Relaxed); // 原子写
    }
    
    pub async fn dispatch_message(&mut self, response: &Response) -> Result<()> {
        // 1. 预解析为通用的 Value
        let v = response.data.clone();

        // 2. 获取 topic_info 字段用于路由消息，在该策略中extended可以用label
        let topic_info = &response.label;
        
        // 3. 根据 topic_info 的内容进行分发 (match)
        if topic_info.contains("ExtendedBestPrices") {
            // 数据不新鲜直接跳过
            if response.reach_time - response.received_time > 100 {
                return Ok(());
            }
            
            self.process_best_prices(&v).await?;            
        } else if topic_info.contains("ExtendedAccount") {
            self.process_account(&v).await?;
        } else {
            // 如果是未知的 topic，返回一个错误
            bail!("Received a message with an unknown topic_info: {}, value: \n {}", topic_info, serde_json::to_string_pretty(&v)?);
        }

        Ok(())
    }
    
    pub async fn process_best_prices(&mut self, value: &Value) -> Result<()> {
        // 预先捕获整个 Value 的字符串表示，用于错误报告
        let value_str = serde_json::to_string(&value).unwrap_or_else(|_| "无法序列化 JSON Value".to_string());

        // 尝试获取 data 字段
        let data = value.get("data")
            .ok_or_else(|| anyhow!("获取 'data' 字段失败，原始 JSON: {}", value_str))?;

        // 尝试从 data 中获取 "a" (asks) 数组
        let asks_array = data.get("a")
            .and_then(|v| v.as_array()) // and_then 链式调用，确保只有当 v 存在且是数组时才继续
            .ok_or_else(|| anyhow!("获取 'data.a' 数组失败，原始 JSON: {}", value_str))?;

        // 尝试从 data 中获取 "b" (bids) 数组
        let bids_array = data.get("b")
            .and_then(|v| v.as_array())
            .ok_or_else(|| anyhow!("获取 'data.b' 数组失败，原始 JSON: {}", value_str))?;

        // 如若有发送asks信息
        if asks_array.len() > 0 {
            let ask_item = &asks_array[0];
            let p = ask_item.get("p")
                .and_then(|v| v.as_str())
                .ok_or_else(|| anyhow!("获取 'data.a.p' 字符串失败，原始 JSON: {}", value_str))?;
            
            self.best_ask = Decimal::from_str(p)
                .map_err(|e| anyhow!("将价格字符串 '{}' 解析为 Decimal 失败: {}，原始 JSON: {}", p, e, value_str))?;
        }

        // 如若有发送bids信息
        if bids_array.len() > 0 {
            let bid_item = &bids_array[0];
            let p = bid_item.get("p")
                .and_then(|v| v.as_str())
                .ok_or_else(|| anyhow!("获取 'data.b.p' 字符串失败，原始 JSON: {}", value_str))?;

            self.best_bid = Decimal::from_str(p)
                .map_err(|e| anyhow!("将价格字符串 '{}' 解析为 Decimal 失败: {}，原始 JSON: {}", p, e, value_str))?;
        }
        
        Ok(())
    }

    pub async fn process_account(&mut self, value: &Value) -> Result<()> {
        // 预先捕获整个 Value 的字符串表示，用于错误报告
        let value_str = serde_json::to_string(&value).unwrap_or_else(|_| "无法序列化 JSON Value".to_string());

        // 获取 data 字段
        let data = value.get("data")
            .ok_or_else(|| anyhow!("获取 'data' 字段失败，原始 JSON: {}", value_str))?;

        // 获取type字段，用于解析归类
        let d_type = value.get("type")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow!("获取 'type' 字符串失败，原始 JSON: {}", value_str))?;

        match d_type {
            "BALANCE" => {
                let balance = data.get("balance")
                    .ok_or_else(|| anyhow!("获取 'data.balance' 字段失败，原始 JSON: {}", value_str))?;

                self.extended_balance = balance.clone();
            }
            "ORDER" => {
                let orders = data.get("orders")
                    .and_then(|v| v.as_array())
                    .ok_or_else(|| anyhow!("获取 'data.orders' 字段失败，原始 JSON: {}", value_str))?;

                // 遍历order
                for order in orders {
                    let id = order.get("id")
                        .and_then(|v| v.as_i64())
                        .ok_or_else(|| anyhow!("遍历获取 'order.id' 时失败，原始JSON：{}", value_str))?;
                    // 放入map中
                    self.extended_orders.insert(id.to_string(), order.clone());
                }

                // TODO 已完成订单，并且60分钟以上的要清库
            }
            "POSITION" => {
                let positions = data.get("positions")
                    .and_then(|v| v.as_array())
                    .ok_or_else(|| anyhow!("获取 'data.positions' 字段失败，原始 JSON: {}", value_str))?;
                
                // 将map清空，position只保留最新信息
                self.extended_position.clear();

                // 将position装入对应的map中
                for position in positions {
                    let status = position.get("status")
                        .and_then(|v| v.as_str())
                        .ok_or_else(|| anyhow!("获取 'position.status' 字符串失败，原始 JSON: {}", value_str))?;
                    
                    // 只保留当前的有效持仓
                    if status != "OPENED" {
                        continue;
                    }
                    
                    let market = position.get("market")
                        .and_then(|v| v.as_str())
                        .ok_or_else(|| anyhow!("获取 'position.market' 字符串失败，原始 JSON: {}", value_str))?;

                    let side = position.get("side")
                        .and_then(|v| v.as_str())
                        .ok_or_else(|| anyhow!("获取 'position.side' 字符串失败，原始 JSON: {}", value_str))?;
                    
                    let key = format!("{}_{}", market, side);
                    
                    // 将有效持仓放入position中
                    self.extended_position.insert(key, position.clone());
                }
            }
            "TRADE" => {}
            &_ => {
                bail!("未知类型的 'type' 原始 JSON: {}", value_str);
            }
        }

        Ok(())
    }
}