package keeper

import (
	"context"

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

// GetBlockReward calculates the block reward based on the current epoch.
func (k Keeper) GetBlockReward(ctx context.Context) sdk.Coin {
	sdkCtx := sdk.UnwrapSDKContext(ctx)
	currentBlock := sdkCtx.BlockHeight()
	params, _ := k.Params.Get(ctx)

	// Calculate epoch
	// Each epoch has blocks_per_epoch (default 525,600)
	epoch := currentBlock / params.BlocksPerEpoch

	// Reward drops 10x every epoch
	baseReward := sdkmath.NewInt(params.BaseReward)
	minReward := sdkmath.NewInt(params.MinReward)

	for i := int64(0); i < epoch; i++ {
		baseReward = baseReward.Quo(sdkmath.NewInt(10))
		if baseReward.LT(minReward) {
			baseReward = minReward
			break
		}
	}

	return sdk.NewCoin("umc", baseReward)
}