// Package config provides configuration management for the MEV bot
package config

import (
	"fmt"
	"os"

	"github.com/ethereum/go-ethereum/common"
	"gopkg.in/yaml.v3"
)

// DEXConfig contains configuration for all supported DEXes
type DEXConfig struct {
	Routers   map[string]RouterConfig   `yaml:"routers"`
	Factories map[string]FactoryConfig  `yaml:"factories"`
	TopTokens []string                  `yaml:"top_tokens"`
}

// RouterConfig contains configuration for a DEX router
type RouterConfig struct {
	Address string `yaml:"address"`
	Name    string `yaml:"name"`
	Version string `yaml:"version"`
	Type    string `yaml:"type"` // "router" or "pool"
}

// FactoryConfig contains configuration for a DEX factory
type FactoryConfig struct {
	Address string `yaml:"address"`
	Name    string `yaml:"name"`
}

// LoadDEXConfig loads DEX configuration from a YAML file
func LoadDEXConfig(path string) (*DEXConfig, error) {
	data, err := os.ReadFile(path)
	if err != nil {
		return nil, fmt.Errorf("failed to read config file: %w", err)
	}

	var config DEXConfig
	if err := yaml.Unmarshal(data, &config); err != nil {
		return nil, fmt.Errorf("failed to parse config file: %w", err)
	}

	// Validate addresses
	for name, router := range config.Routers {
		if !common.IsHexAddress(router.Address) {
			return nil, fmt.Errorf("invalid router address for %s: %s", name, router.Address)
		}
	}

	for name, factory := range config.Factories {
		if !common.IsHexAddress(factory.Address) {
			return nil, fmt.Errorf("invalid factory address for %s: %s", name, factory.Address)
		}
	}

	for i, token := range config.TopTokens {
		if !common.IsHexAddress(token) {
			return nil, fmt.Errorf("invalid token address at index %d: %s", i, token)
		}
	}

	return &config, nil
}

// GetRouterAddress returns the address for a router by name
func (c *DEXConfig) GetRouterAddress(name string) (common.Address, bool) {
	router, ok := c.Routers[name]
	if !ok {
		return common.Address{}, false
	}
	return common.HexToAddress(router.Address), true
}

// GetFactoryAddress returns the address for a factory by name
func (c *DEXConfig) GetFactoryAddress(name string) (common.Address, bool) {
	factory, ok := c.Factories[name]
	if !ok {
		return common.Address{}, false
	}
	return common.HexToAddress(factory.Address), true
}

// GetTopTokens returns all configured top tokens as addresses
func (c *DEXConfig) GetTopTokens() []common.Address {
	tokens := make([]common.Address, len(c.TopTokens))
	for i, token := range c.TopTokens {
		tokens[i] = common.HexToAddress(token)
	}
	return tokens
}

// IsKnownRouter checks if an address is a known router
func (c *DEXConfig) IsKnownRouter(addr common.Address) (RouterConfig, bool) {
	addrHex := addr.Hex()
	for _, router := range c.Routers {
		if router.Address == addrHex {
			return router, true
		}
	}
	return RouterConfig{}, false
}

// DefaultDEXConfig returns default configuration for Arbitrum mainnet
func DefaultDEXConfig() *DEXConfig {
	return &DEXConfig{
		Routers: map[string]RouterConfig{
			"sushiswap": {
				Address: "0x1b02dA8Cb0d097eB8D57A175b88c7D8b47997506",
				Name:    "SushiSwap",
				Version: "V2",
				Type:    "router",
			},
			"uniswap_v3_router": {
				Address: "0xE592427A0AEce92De3Edee1F18E0157C05861564",
				Name:    "UniswapV3",
				Version: "V1",
				Type:    "router",
			},
			"uniswap_v3_router_v2": {
				Address: "0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45",
				Name:    "UniswapV3",
				Version: "V2",
				Type:    "router",
			},
			"uniswap_universal": {
				Address: "0xEf1c6E67703c7BD7107eed8303Fbe6EC2554BF6B",
				Name:    "UniswapUniversal",
				Version: "V1",
				Type:    "router",
			},
			"camelot_v2": {
				Address: "0xc873fEcbd354f5A56E00E710B90EF4201db2448d",
				Name:    "Camelot",
				Version: "V2",
				Type:    "router",
			},
			"camelot_v3": {
				Address: "0x1F721E2E82F6676FCE4eA07A5958cF098D339e18",
				Name:    "Camelot",
				Version: "V3",
				Type:    "router",
			},
			"balancer": {
				Address: "0xBA12222222228d8Ba445958a75a0704d566BF2C8",
				Name:    "Balancer",
				Version: "V2",
				Type:    "vault",
			},
			"curve": {
				Address: "0x7544Fe3d184b6B55D6B36c3FCA1157eE0Ba30287",
				Name:    "Curve",
				Version: "V1",
				Type:    "router",
			},
			"kyberswap": {
				Address: "0x6131B5fae19EA4f9D964eAc0408E4408b66337b5",
				Name:    "KyberSwap",
				Version: "V1",
				Type:    "router",
			},
			"kyberswap_v2": {
				Address: "0xC1e7dFE73E1598E3910EF4C7845B68A19f0e8c6F",
				Name:    "KyberSwap",
				Version: "V2",
				Type:    "router",
			},
			"1inch": {
				Address: "0x1111111254EEB25477B68fb85Ed929f73A960582",
				Name:    "1inch",
				Version: "V5",
				Type:    "router",
			},
			"paraswap": {
				Address: "0xDEF171Fe48CF0115B1d80b88dc8eAB59176FEe57",
				Name:    "Paraswap",
				Version: "V5",
				Type:    "router",
			},
		},
		Factories: map[string]FactoryConfig{
			"uniswap_v2": {
				Address: "0xf1D7CC64Fb4452F05c498126312eBE29f30Fbcf9",
				Name:    "UniswapV2",
			},
			"uniswap_v3": {
				Address: "0x1F98431c8aD98523631AE4a59f267346ea31F984",
				Name:    "UniswapV3",
			},
			"sushiswap": {
				Address: "0xc35DADB65012eC5796536bD9864eD8773aBc74C4",
				Name:    "SushiSwap",
			},
		},
		TopTokens: []string{
			"0x82aF49447D8a07e3bd95BD0d56f35241523fBab1", // WETH
			"0xaf88d065e77c8cC2239327C5EDb3A432268e5831", // USDC
			"0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9", // USDT
			"0x2f2a2543B76A4166549F7aaB2e75Bef0aefC5B0f", // WBTC
			"0xDA10009cBd5D07dd0CeCc66161FC93D7c9000da1", // DAI
			"0xFF970A61A04b1cA14834A43f5dE4533eBDDB5CC8", // USDC.e
		},
	}
}