package keeper

import (
	"github.com/cosmos/cosmos-sdk/client"
	"github.com/cosmos/cosmos-sdk/codec"
	sdk "github.com/cosmos/cosmos-sdk/types"
	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"

	abci "github.com/tendermint/tendermint/abci/types"

	"github.com/kava-labs/kava/x/incentive/types"
)

// NewQuerier is the module level router for state queries
func NewQuerier(k Keeper) sdk.Querier {
	return func(ctx sdk.Context, path []string, req abci.RequestQuery) (res []byte, err error) {
		switch path[0] {
		case types.QueryGetParams:
			return queryGetParams(ctx, req, k)
		case types.QueryGetClaims:
			return queryGetClaims(ctx, req, k)
		default:
			return nil, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "unknown %s query endpoint", types.ModuleName)
		}
	}
}

// query params in the store
func queryGetParams(ctx sdk.Context, req abci.RequestQuery, k Keeper) ([]byte, error) {
	// Get params
	params := k.GetParams(ctx)

	// Encode results
	bz, err := codec.MarshalJSONIndent(k.cdc, params)
	if err != nil {
		return nil, sdkerrors.Wrap(sdkerrors.ErrJSONMarshal, err.Error())
	}
	return bz, nil
}

func queryGetClaims(ctx sdk.Context, req abci.RequestQuery, k Keeper) ([]byte, error) {
	var requestParams types.QueryClaimsParams
	err := k.cdc.UnmarshalJSON(req.Data, &requestParams)
	if err != nil {
		return nil, sdkerrors.Wrap(sdkerrors.ErrJSONUnmarshal, err.Error())
	}
	var claims types.USDXMintingClaims
	if len(requestParams.Owner) > 0 {
		claim, _ := k.GetUSDXMintingClaim(ctx, requestParams.Owner)
		claims = append(claims, claim)
	} else {
		claims = k.GetAllUSDXMintingClaims(ctx)
	}

	var paginatedClaims types.USDXMintingClaims

	start, end := client.Paginate(len(claims), requestParams.Page, requestParams.Limit, 100)
	if start < 0 || end < 0 {
		paginatedClaims = types.USDXMintingClaims{}
	} else {
		paginatedClaims = claims[start:end]
	}

	bz, err := codec.MarshalJSONIndent(k.cdc, paginatedClaims)
	if err != nil {
		return nil, sdkerrors.Wrap(sdkerrors.ErrJSONMarshal, err.Error())
	}
	return bz, nil
}