// Package types provides shared types used across multiple packages to avoid circular dependencies
package types

import (
	"math/big"
	"time"

	"github.com/ethereum/go-ethereum/common"
)

// ArbitrageOpportunity represents a potential arbitrage opportunity
// This is the canonical definition used across all packages
type ArbitrageOpportunity struct {
	ID              string                 // Unique identifier for the opportunity
	Path            []string               // Token path for the arbitrage
	Pools           []string               // Pools involved in the arbitrage
	AmountIn        *big.Int               // Input amount for the arbitrage (wei)
	Profit          *big.Int               // Estimated gross profit in wei
	NetProfit       *big.Int               // Net profit after gas costs in wei
	GasEstimate     *big.Int               // Estimated gas usage cost in wei
	GasCost         *big.Int               // Calculated gas cost in wei (optional)
	EstimatedProfit *big.Int               // Cached estimated profit in wei
	RequiredAmount  *big.Int               // Capital required to execute in wei
	ROI             float64                // Return on investment percentage
	Protocol        string                 // DEX protocol
	ExecutionTime   int64                  // Estimated execution time in milliseconds
	Confidence      float64                // 0-1 confidence score
	PriceImpact     float64                // Price impact percentage
	MaxSlippage     float64                // Maximum acceptable slippage percentage
	TokenIn         common.Address         // Input token address
	TokenOut        common.Address         // Output token address
	Timestamp       int64                  // Detection timestamp (unix seconds)
	DetectedAt      time.Time              // Detection timestamp with higher precision
	ExpiresAt       time.Time              // Expiration timestamp
	Urgency         int                    // Relative urgency (1-10)
	Risk            float64                // Risk assessment score (0-1)
	Profitable      bool                   // Indicates if opportunity is currently profitable
	Quantities      *OpportunityQuantities // Optional UniversalDecimal snapshots
}

// DecimalAmount serialises a decimal quantity without importing math helpers.
type DecimalAmount struct {
	Value    string `json:"value"`
	Decimals uint8  `json:"decimals"`
	Symbol   string `json:"symbol"`
}

// OpportunityQuantities bundles the primary decimal metrics for an opportunity.
type OpportunityQuantities struct {
	AmountIn      DecimalAmount `json:"amount_in"`
	AmountOut     DecimalAmount `json:"amount_out"`
	GrossProfit   DecimalAmount `json:"gross_profit"`
	NetProfit     DecimalAmount `json:"net_profit"`
	GasCost       DecimalAmount `json:"gas_cost"`
	ProfitPercent DecimalAmount `json:"profit_percentage"`
	PriceImpact   DecimalAmount `json:"price_impact"`
}

// PriceMovement represents a potential price movement
type PriceMovement struct {
	Token0      string     // Token address
	Token1      string     // Token address
	Pool        string     // Pool address
	Protocol    string     // DEX protocol
	AmountIn    *big.Int   // Amount of token being swapped in
	AmountOut   *big.Int   // Amount of token being swapped out
	PriceBefore *big.Float // Price before the swap
	PriceAfter  *big.Float // Price after the swap (to be calculated)
	PriceImpact float64    // Calculated price impact
	TickBefore  int        // Tick before the swap
	TickAfter   int        // Tick after the swap (to be calculated)
	Timestamp   int64      // Event timestamp
}

// CachedData represents cached pool data
type CachedData struct {
	Address      common.Address
	Token0       common.Address
	Token1       common.Address
	Fee          int64
	Liquidity    *big.Int
	SqrtPriceX96 *big.Int
	Tick         int
	TickSpacing  int
	LastUpdated  int64
	Protocol     string
}

// SwapEvent represents a swap event
type SwapEvent struct {
	Type            int
	Protocol        string
	PoolAddress     common.Address
	Token0          common.Address
	Token1          common.Address
	Amount0         *big.Int
	Amount1         *big.Int
	SqrtPriceX96    *big.Int
	Liquidity       *big.Int
	Tick            int
	Timestamp       int64
	TransactionHash common.Hash
	BlockNumber     uint64
	Fee             uint32
}

// LiquidityEvent represents a liquidity event (add/remove)
type LiquidityEvent struct {
	Type            int
	Protocol        string
	PoolAddress     common.Address
	Token0          common.Address
	Token1          common.Address
	Amount0         *big.Int
	Amount1         *big.Int
	Liquidity       *big.Int
	Tick            int
	Timestamp       int64
	TransactionHash common.Hash
	BlockNumber     uint64
	Fee             uint32
	Sender          common.Address
	Recipient       common.Address
	EventType       string // "add" or "remove"
}

// PoolData represents pool data
type PoolData struct {
	Address      common.Address
	Token0       common.Address
	Token1       common.Address
	Fee          int64
	Liquidity    *big.Int
	SqrtPriceX96 *big.Int
	Tick         int64
	TickSpacing  int
	LastUpdated  int64
	Protocol     string
}

// Constants for event types
const (
	Unknown = iota
	Swap
	AddLiquidity
	RemoveLiquidity
	NewPool
)