package keeper

import (
	"context"

	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/sonr-io/sonr/x/dex/types"
)

var _ types.MsgServer = msgServer{}

type msgServer struct {
	Keeper
}

// NewMsgServerImpl returns an implementation of the module MsgServer interface.
func NewMsgServerImpl(keeper Keeper) types.MsgServer {
	return &msgServer{Keeper: keeper}
}

// RegisterDEXAccount implements types.MsgServer.
func (ms msgServer) RegisterDEXAccount(
	ctx context.Context,
	msg *types.MsgRegisterDEXAccount,
) (*types.MsgRegisterDEXAccountResponse, error) {
	sdkCtx := sdk.UnwrapSDKContext(ctx)

	// Register the DEX account using the keeper's ICA controller logic
	account, err := ms.Keeper.RegisterDEXAccount(
		sdkCtx,
		msg.Did,
		msg.ConnectionId,
		msg.Features,
	)
	if err != nil {
		return nil, err
	}

	// Emit event for account registration
	sdkCtx.EventManager().EmitEvent(
		sdk.NewEvent(
			types.EventTypeDEXAccountRegistered,
			sdk.NewAttribute("did", msg.Did),
			sdk.NewAttribute("connection_id", msg.ConnectionId),
			sdk.NewAttribute("port_id", account.PortId),
		),
	)

	return &types.MsgRegisterDEXAccountResponse{
		PortId:         account.PortId,
		AccountAddress: account.AccountAddress,
	}, nil
}

// TODO: ExecuteSwap - Implement cross-chain swap execution via ICA
// This method should handle token swaps on remote chains through Interchain Accounts
// Required implementation steps:
// 1. Validate the sender's DID exists and is active using did keeper
// 2. Verify UCAN token has proper swap capabilities (resource: swap, action: execute)
// 3. Retrieve the ICA account for this DID and connection from state
// 4. Build the appropriate swap message for the target chain's DEX protocol
// 5. Create ICA packet data with the swap transaction
// 6. Send ICA packet through IBC channel and await acknowledgment
// 7. Store transaction details in DWN for user history tracking
// 8. Emit events for indexing and monitoring
// Returns: Sequence number and transaction ID on success
// ExecuteSwap implements types.MsgServer.
func (ms msgServer) ExecuteSwap(
	ctx context.Context,
	msg *types.MsgExecuteSwap,
) (*types.MsgExecuteSwapResponse, error) {
	// Validate UCAN permission if token provided
	if msg.UcanToken != "" {
		// Use connection ID as resource ID for swap operations
		if err := ms.validateUCANPermission(ctx, msg.UcanToken, "swap", msg.ConnectionId, types.DEXOpExecuteSwap); err != nil {
			return nil, err
		}
	}

	// TODO: Implement swap execution via ICA
	// 1. Validate DID
	// 2. Get ICA account for this DID and connection
	// 3. Construct swap message for remote chain
	// 4. Send ICA packet with swap instruction
	// 5. Track transaction in DWN
	return &types.MsgExecuteSwapResponse{}, nil
}

// validateUCANPermission validates UCAN token for a DEX operation
func (ms msgServer) validateUCANPermission(
	ctx context.Context,
	ucanToken string,
	resourceType string,
	resourceID string,
	operation types.DEXOperation,
) error {
	if ms.permissionValidator == nil {
		// Permission validator not available - skip validation
		return nil
	}

	return ms.permissionValidator.ValidatePermission(
		ctx,
		ucanToken,
		resourceType,
		resourceID,
		operation,
	)
}

// TODO: ProvideLiquidity - Implement cross-chain liquidity provision via ICA
// This method should handle adding liquidity to pools on remote chains
// Required implementation steps:
// 1. Validate the sender's DID exists and is active using did keeper
// 2. Verify UCAN token has liquidity provision capabilities (resource: liquidity, action: provide)
// 3. Retrieve the ICA account for this DID and connection from state
// 4. Calculate appropriate liquidity amounts based on pool ratios
// 5. Build liquidity provision message for target chain's AMM protocol
// 6. Create ICA packet data with the liquidity transaction
// 7. Send ICA packet through IBC channel and await acknowledgment
// 8. Store LP token information in DWN for tracking
// 9. Update user's position records in state
// Returns: Sequence number and LP token amount on success
// ProvideLiquidity implements types.MsgServer.
func (ms msgServer) ProvideLiquidity(
	ctx context.Context,
	msg *types.MsgProvideLiquidity,
) (*types.MsgProvideLiquidityResponse, error) {
	// TODO: Implement liquidity provision via ICA
	// 1. Validate DID and UCAN token
	// 2. Get ICA account for this DID and connection
	// 3. Construct liquidity provision message for remote chain
	// 4. Send ICA packet with liquidity instruction
	// 5. Track transaction in DWN
	return &types.MsgProvideLiquidityResponse{}, nil
}

// TODO: RemoveLiquidity - Implement cross-chain liquidity removal via ICA
// This method should handle removing liquidity from pools on remote chains
// Required implementation steps:
// 1. Validate the sender's DID exists and is active using did keeper
// 2. Verify UCAN token has liquidity removal capabilities (resource: liquidity, action: remove)
// 3. Retrieve the ICA account for this DID and connection from state
// 4. Verify user has sufficient LP tokens to remove
// 5. Build liquidity removal message for target chain's AMM protocol
// 6. Create ICA packet data with the removal transaction
// 7. Send ICA packet through IBC channel and await acknowledgment
// 8. Update LP token information in DWN after removal
// 9. Clear user's position records from state if fully withdrawn
// Returns: Sequence number and withdrawn token amounts on success
// RemoveLiquidity implements types.MsgServer.
func (ms msgServer) RemoveLiquidity(
	ctx context.Context,
	msg *types.MsgRemoveLiquidity,
) (*types.MsgRemoveLiquidityResponse, error) {
	// TODO: Implement liquidity removal via ICA
	// 1. Validate DID and UCAN token
	// 2. Get ICA account for this DID and connection
	// 3. Construct liquidity removal message for remote chain
	// 4. Send ICA packet with removal instruction
	// 5. Track transaction in DWN
	return &types.MsgRemoveLiquidityResponse{}, nil
}

// TODO: CreateLimitOrder - Implement cross-chain limit order creation via ICA
// This method should handle placing limit orders on remote chain order books
// Required implementation steps:
// 1. Validate the sender's DID exists and is active using did keeper
// 2. Verify UCAN token has order creation capabilities (resource: order, action: create)
// 3. Retrieve the ICA account for this DID and connection from state
// 4. Validate order parameters (price, amount, expiry) against market conditions
// 5. Build limit order message for target chain's order book protocol
// 6. Create ICA packet data with the order placement transaction
// 7. Send ICA packet through IBC channel and await acknowledgment
// 8. Store order details in local state for tracking
// 9. Create order record in DWN with unique order ID
// 10. Set up monitoring for order fills and expiration
// Returns: Sequence number and unique order ID on success
// CreateLimitOrder implements types.MsgServer.
func (ms msgServer) CreateLimitOrder(
	ctx context.Context,
	msg *types.MsgCreateLimitOrder,
) (*types.MsgCreateLimitOrderResponse, error) {
	// TODO: Implement limit order creation via ICA
	// 1. Validate DID and UCAN token
	// 2. Get ICA account for this DID and connection
	// 3. Construct limit order message for remote chain
	// 4. Send ICA packet with order instruction
	// 5. Track order in DWN
	return &types.MsgCreateLimitOrderResponse{}, nil
}

// TODO: CancelOrder - Implement cross-chain order cancellation via ICA
// This method should handle cancelling existing limit orders on remote chains
// Required implementation steps:
// 1. Validate the sender's DID exists and is active using did keeper
// 2. Verify UCAN token has order cancellation capabilities (resource: order, action: cancel)
// 3. Retrieve the ICA account for this DID and connection from state
// 4. Verify the order exists and belongs to the sender
// 5. Check order status is still open (not filled or already cancelled)
// 6. Build order cancellation message for target chain's order book protocol
// 7. Create ICA packet data with the cancellation transaction
// 8. Send ICA packet through IBC channel and await acknowledgment
// 9. Update order status in local state to cancelled
// 10. Update order record in DWN with cancellation details
// Returns: Sequence number on successful cancellation
// CancelOrder implements types.MsgServer.
func (ms msgServer) CancelOrder(
	ctx context.Context,
	msg *types.MsgCancelOrder,
) (*types.MsgCancelOrderResponse, error) {
	// TODO: Implement order cancellation via ICA
	// 1. Validate DID and UCAN token
	// 2. Get ICA account for this DID and connection
	// 3. Construct order cancellation message for remote chain
	// 4. Send ICA packet with cancellation instruction
	// 5. Update order status in DWN
	return &types.MsgCancelOrderResponse{}, nil
}