// Package keeper implements the dex module keeper
package keeper

import (
	"fmt"

	"cosmossdk.io/math"
	sdk "github.com/cosmos/cosmos-sdk/types"
)

// Portfolio represents a user's portfolio across chains
type Portfolio struct {
	DID         string
	Connections []string
	Balances    map[string]sdk.Coins // connectionID -> balances
	Positions   map[string]*Position // positionID -> position
	TotalValue  math.LegacyDec
	UpdatedAt   int64
}

// Position represents a liquidity or staking position
type Position struct {
	PositionID   string
	ConnectionID string
	PoolID       uint64
	Type         PositionType
	Shares       math.Int
	Value        sdk.Coins
	APR          math.LegacyDec
	CreatedAt    int64
}

// PositionType represents the type of position
type PositionType int

const (
	PositionTypeLiquidity PositionType = iota
	PositionTypeStaking
	PositionTypeLending
	PositionTypeBorrowing
)

// GetPortfolio retrieves the complete portfolio for a DID
func (k Keeper) GetPortfolio(
	ctx sdk.Context,
	did string,
) (*Portfolio, error) {
	// Get all DEX accounts for this DID
	accounts, err := k.GetDEXAccountsByDID(ctx, did)
	if err != nil {
		return nil, fmt.Errorf("failed to get DEX accounts: %w", err)
	}

	portfolio := &Portfolio{
		DID:         did,
		Connections: make([]string, 0),
		Balances:    make(map[string]sdk.Coins),
		Positions:   make(map[string]*Position),
		TotalValue:  math.LegacyZeroDec(),
		UpdatedAt:   ctx.BlockTime().Unix(),
	}

	// Collect connections
	for _, account := range accounts {
		portfolio.Connections = append(portfolio.Connections, account.ConnectionId)

		// Get balances for each connection
		balances, err := k.GetRemoteBalances(ctx, did, account.ConnectionId)
		if err == nil {
			portfolio.Balances[account.ConnectionId] = balances
		}
	}

	// Calculate total value (simplified - would need price feeds)
	portfolio.TotalValue = k.CalculatePortfolioValue(ctx, portfolio.Balances)

	return portfolio, nil
}

// GetRemoteBalances queries balances on a remote chain
func (k Keeper) GetRemoteBalances(
	ctx sdk.Context,
	did string,
	connectionID string,
) (sdk.Coins, error) {
	// This would query the remote chain for balances
	// For now, return placeholder balances
	return sdk.NewCoins(
		sdk.NewCoin("uatom", math.NewInt(1000000)),
		sdk.NewCoin("uosmo", math.NewInt(2000000)),
	), nil
}

// GetPositions retrieves all positions for a DID
func (k Keeper) GetPositions(
	ctx sdk.Context,
	did string,
	connectionID string,
) ([]*Position, error) {
	// This would query positions from remote chain
	// For now, return empty list
	return []*Position{}, nil
}

// CalculatePortfolioValue calculates the total portfolio value
func (k Keeper) CalculatePortfolioValue(
	ctx sdk.Context,
	balances map[string]sdk.Coins,
) math.LegacyDec {
	// This would use price feeds to calculate USD value
	// For now, return a simple sum of amounts
	totalValue := math.LegacyZeroDec()

	for _, coins := range balances {
		for _, coin := range coins {
			// Simplified: assume 1:1 USD value
			totalValue = totalValue.Add(math.LegacyNewDecFromInt(coin.Amount))
		}
	}

	return totalValue
}

// GetPortfolioHistory retrieves historical portfolio data
func (k Keeper) GetPortfolioHistory(
	ctx sdk.Context,
	did string,
	startTime int64,
	endTime int64,
) ([]*PortfolioSnapshot, error) {
	// This would retrieve historical snapshots from state
	// For now, return empty list
	return []*PortfolioSnapshot{}, nil
}

// PortfolioSnapshot represents a point-in-time portfolio state
type PortfolioSnapshot struct {
	Timestamp  int64
	TotalValue math.LegacyDec
	Balances   map[string]sdk.Coins
	Positions  int
}

// UpdatePortfolioSnapshot creates a new portfolio snapshot
func (k Keeper) UpdatePortfolioSnapshot(
	ctx sdk.Context,
	did string,
) error {
	portfolio, err := k.GetPortfolio(ctx, did)
	if err != nil {
		return fmt.Errorf("failed to get portfolio: %w", err)
	}

	snapshot := &PortfolioSnapshot{
		Timestamp:  ctx.BlockTime().Unix(),
		TotalValue: portfolio.TotalValue,
		Balances:   portfolio.Balances,
		Positions:  len(portfolio.Positions),
	}

	// Store snapshot in state or DWN
	// Implementation would depend on storage strategy
	_ = snapshot

	return nil
}

// GetPortfolioPerformance calculates portfolio performance metrics
func (k Keeper) GetPortfolioPerformance(
	ctx sdk.Context,
	did string,
	period int64, // Period in seconds
) (*PerformanceMetrics, error) {
	// This would calculate performance based on historical data
	// For now, return placeholder metrics
	return &PerformanceMetrics{
		TotalReturn:    math.LegacyNewDec(10),             // 10% return
		TotalReturnPct: math.LegacyNewDecWithPrec(10, 2),  // 10%
		DailyReturn:    math.LegacyNewDec(1),              // 1% daily
		APY:            math.LegacyNewDecWithPrec(365, 2), // 365% APY (simplified)
		Volatility:     math.LegacyNewDecWithPrec(15, 2),  // 15% volatility
		SharpeRatio:    math.LegacyNewDecWithPrec(2, 1),   // 2.0 Sharpe
		MaxDrawdown:    math.LegacyNewDecWithPrec(5, 2),   // 5% max drawdown
	}, nil
}

// PerformanceMetrics represents portfolio performance metrics
type PerformanceMetrics struct {
	TotalReturn    math.LegacyDec
	TotalReturnPct math.LegacyDec
	DailyReturn    math.LegacyDec
	APY            math.LegacyDec
	Volatility     math.LegacyDec
	SharpeRatio    math.LegacyDec
	MaxDrawdown    math.LegacyDec
}

// GetTopPerformers returns the top performing assets in portfolio
func (k Keeper) GetTopPerformers(
	ctx sdk.Context,
	did string,
	limit int,
) ([]*AssetPerformance, error) {
	// This would analyze asset performance
	// For now, return empty list
	return []*AssetPerformance{}, nil
}

// AssetPerformance represents performance of a single asset
type AssetPerformance struct {
	Asset      string
	Connection string
	Return     math.LegacyDec
	ReturnPct  math.LegacyDec
	Volume     math.Int
}