package logic

import (
	"context"
	"math"
	"sync"

	"big-qmt/go-client/config"
	"big-qmt/go-client/libs"
	"big-qmt/go-client/sdk"
)

var peakMu sync.Mutex
var peakGrids = map[string]int{}

func peakKey(code, leg string) string { return code + "|" + leg }

func calcBuyVolume(price, value float64) int {
	return libs.CalcBuyVolume(price, value)
}

func stateCodes(state *State) []string {
	state.mu.Lock()
	defer state.mu.Unlock()
	return append([]string(nil), state.Codes...)
}

func managePositions(ctx context.Context, client *sdk.Client, books *OrderBook, ticks map[string]sdk.Tick, positions []sdk.Position, marketOK bool, buyBudget *float64) {
	if positions == nil || QuantState == nil {
		logf("ERROR", "[ZT][持仓] 持仓或状态不可用，本轮跳过")
		return
	}
	buys, sells, ok := books.activeSets(ctx, client)
	if !ok {
		return
	}
	before := map[string]struct{}{}
	for _, code := range stateCodes(QuantState) {
		before[code] = struct{}{}
	}
	if ticks == nil {
		ticks = map[string]sdk.Tick{}
	}
	type row struct {
		volume, usable int
		avg, price     float64
		stock          string
		item           *StateItem
	}
	rows := make([]row, 0, len(positions))
	seen := map[string]struct{}{}
	for _, pos := range positions {
		code := pos.StockCode
		if code == "" {
			continue
		}
		seen[code] = struct{}{}
		item := syncItem(QuantState, code, pos.Volume, pos.OpenPrice, buys, sells, books)
		if pos.Volume > 0 {
			rows = append(rows, row{stock: code, volume: pos.Volume, usable: pos.CanUseVolume, avg: pos.OpenPrice, price: ticks[code].LastPrice, item: item})
		}
	}
	for _, code := range stateCodes(QuantState) {
		if _, ok := seen[code]; !ok {
			syncItem(QuantState, code, 0, 0, buys, sells, books)
		}
	}
	after := map[string]struct{}{}
	for _, code := range stateCodes(QuantState) {
		after[code] = struct{}{}
	}
	for code := range before {
		if _, ok := after[code]; !ok {
			forget(code)
		}
	}
	for _, r := range rows {
		if r.item == nil || r.item.BaseStatus == StatusIng || r.item.AddedStatus == StatusIng || r.avg <= 0 || r.price <= 0 || r.volume%100 != 0 {
			continue
		}
		if r.volume != r.item.BaseQty+r.item.AddedQty {
			logf("INFO", "[ZT][持仓] %s 数量异常，底仓=%d 补仓=%d 现有=%d", r.stock, r.item.BaseQty, r.item.AddedQty, r.volume)
			continue
		}
		if r.item.AddedQty > 0 {
			addPnL := -999.0
			if r.item.AddedCost > 0 {
				addPnL = (r.price - r.item.AddedCost) / r.item.AddedCost * 100
			}
			if retreated(r.item, "add", addPnL) {
				sellLeg(ctx, client, books, r.item, r.usable, r.item.AddedQty, "add", addPnL)
			}
			continue
		}
		basePnL := -999.0
		if r.item.BaseCost > 0 {
			basePnL = (r.price - r.item.BaseCost) / r.item.BaseCost * 100
		}
		if retreated(r.item, "base", basePnL) {
			sellLeg(ctx, client, books, r.item, r.usable, r.item.BaseQty, "base", basePnL)
		} else if basePnL <= config.Account.LossTriggerPct {
			addOnRebound(ctx, client, books, r.item, r.price, marketOK, buyBudget)
		}
	}
	if err := QuantState.Save(); err != nil {
		logf("ERROR", "%v", err)
	}
}

func syncItem(state *State, code string, volume int, avgPrice float64, buys, sells map[string]struct{}, books *OrderBook) *StateItem {
	item, err := state.Get(code)
	if err != nil {
		if volume > 0 {
			logf("ERROR", "[ZT][持仓] %s 无本地状态，跳过", code)
		}
		return nil
	}
	if item.BaseStatus == StatusIng {
		syncBase(state, item, volume, avgPrice, buys, sells, books)
	} else if item.AddedStatus == StatusIng {
		syncAdded(state, item, volume, avgPrice, buys, sells, books)
	} else if volume <= 0 {
		state.Delete(code)
		return nil
	}
	item, _ = state.Get(code)
	return item
}

func syncBase(state *State, item *StateItem, volume int, avgPrice float64, buys, sells map[string]struct{}, books *OrderBook) {
	if books.sideBusy(item.Code, sideBuy, buys) || books.sideBusy(item.Code, sideSell, sells) {
		return
	}
	if volume <= 0 {
		state.Delete(item.Code)
		return
	}
	item.BaseQty = volume - item.AddedQty
	if item.BaseQty < 0 {
		item.BaseQty, item.AddedQty, item.AddedCost, item.AddedStatus = volume, 0, 0, StatusNone
	}
	item.BaseCost = avgPrice
	item.BaseStatus = StatusOk
	state.Set(item)
}

func syncAdded(state *State, item *StateItem, volume int, avgPrice float64, buys, sells map[string]struct{}, books *OrderBook) {
	if books.sideBusy(item.Code, sideBuy, buys) || books.sideBusy(item.Code, sideSell, sells) {
		return
	}
	if volume <= 0 {
		state.Delete(item.Code)
		return
	}
	if volume > item.BaseQty {
		item.AddedQty = volume - item.BaseQty
		item.AddedCost = math.Max(0, (avgPrice*float64(volume)-item.BaseCost*float64(item.BaseQty))/float64(item.AddedQty))
		item.AddedStatus = StatusOk
	} else {
		item.BaseQty, item.BaseCost = volume, avgPrice
		item.AddedQty, item.AddedCost, item.AddedStatus = 0, 0, StatusNone
		peakMu.Lock()
		delete(peakGrids, peakKey(item.Code, "add"))
		peakMu.Unlock()
	}
	state.Set(item)
}

func addOnRebound(ctx context.Context, client *sdk.Client, books *OrderBook, item *StateItem, price float64, marketOK bool, buyBudget *float64) {
	if !marketOK || PosbuyWatch == nil || !PosbuyWatch.Triggered("补仓", item.Code, price) {
		return
	}
	volume := libs.CalcBuyVolume(price, config.Account.BuyValue)
	estimated := price * float64(volume)
	if volume <= 0 || buyBudget == nil || estimated > *buyBudget {
		return
	}
	orderID := newOrderTag("add")
	if books.place(ctx, client, sideBuy, item.Code, volume, orderID) {
		item.AddedOrderId, item.AddedQty, item.AddedCost, item.AddedStatus = orderID, volume, price, StatusIng
		item.AddedNum++
		QuantState.Set(item)
		*buyBudget -= estimated
		if err := QuantState.Save(); err != nil {
			logf("ERROR", "%v", err)
		}
	}
}

func retreated(item *StateItem, leg string, pnl float64) bool {
	if pnl < config.Account.MinProfitPct {
		return false
	}
	grid := int(math.Floor(pnl / config.Account.GridStepPct))
	key := peakKey(item.Code, leg)
	peakMu.Lock()
	defer peakMu.Unlock()
	peak, ok := peakGrids[key]
	if !ok || grid > peak {
		peakGrids[key] = grid
		return false
	}
	return grid < peak
}

func sellLeg(ctx context.Context, client *sdk.Client, books *OrderBook, item *StateItem, usable, volume int, leg string, pnl float64) {
	volume -= volume % 100
	if volume <= 0 || usable < volume {
		return
	}
	orderID := newOrderTag(leg)
	if !books.place(ctx, client, sideSell, item.Code, volume, orderID) {
		return
	}
	if leg == "add" {
		item.AddedOrderId, item.AddedStatus = orderID, StatusIng
	} else {
		item.BaseOrderId, item.BaseStatus = orderID, StatusIng
	}
	QuantState.Set(item)
	if err := QuantState.Save(); err != nil {
		logf("ERROR", "%v", err)
	}
	logf("INFO", "[ZT][止盈] %s 卖出 %d 股，%s腿盈利=%.2f%%", item.Code, volume, leg, pnl)
}

func forget(code string) {
	if OpenWatch != nil {
		OpenWatch.mu.Lock()
		delete(OpenWatch.Data, code)
		OpenWatch.mu.Unlock()
	}
	if PosbuyWatch != nil {
		PosbuyWatch.mu.Lock()
		delete(PosbuyWatch.Data, code)
		PosbuyWatch.mu.Unlock()
	}
	peakMu.Lock()
	delete(peakGrids, peakKey(code, "base"))
	delete(peakGrids, peakKey(code, "add"))
	peakMu.Unlock()
}