package keeper

import (
	"context"
	"errors"
	"fmt"
	"math/big"

	"colinear/x/colinearcore/types"

	sdk "github.com/cosmos/cosmos-sdk/types"
)

func (k msgServer) UnlockFunds(goCtx context.Context, msg *types.MsgUnlockFunds) (*types.MsgUnlockFundsResponse, error) {
	ctx := sdk.UnwrapSDKContext(goCtx)

	lockedUsers, ok := k.Keeper.GetLockedUsers(ctx)
	if !ok {
		return nil, errors.New("unable to get locked users")
	}

	lockedBalStr, ok := lockedUsers.Users[msg.Creator]
	if !ok {
		return nil, fmt.Errorf("no locked balance found for user %s", msg.Creator)
	}

	lockedBal := new(big.Int)
	lockedBal.SetString(lockedBalStr, 10)

	unlockAmt := new(big.Int)
	unlockAmt.SetString(msg.Amount, 10)

	if unlockAmt.Cmp(big.NewInt(0)) != 1 {
		return nil, errors.New("cannot unlock 0 or less uCLR")
	}

	if unlockAmt.Cmp(lockedBal) == 1 {
		return nil, fmt.Errorf("cannot unlock more than locked amount (max: %s)", lockedBalStr)
	}

	sendCoins := sdk.NewCoins(sdk.NewCoin("uclr", sdk.NewIntFromBigInt(unlockAmt)))

	if err := k.bank.SendCoinsFromModuleToAccount(ctx, types.ModuleName, sdk.AccAddress(msg.Creator), sendCoins); err != nil {
		return nil, fmt.Errorf("failed to send %s uCLR: %s", unlockAmt.String(), err)
	}

	remaining := new(big.Int)
	remaining.Sub(lockedBal, unlockAmt)

	if remaining.Cmp(big.NewInt(0)) == 0 {
		delete(lockedUsers.Users, msg.Creator)
	} else {
		lockedUsers.Users[msg.Creator] = remaining.String()
	}

	k.Keeper.SetLockedUsers(ctx, lockedUsers)

	return &types.MsgUnlockFundsResponse{}, nil
}