package rest

import (
	"fmt"
	"net/http"

	"github.com/gorilla/mux"

	"github.com/cosmos/cosmos-sdk/client/context"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/types/rest"

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

const (
	restOwner = "owner"
	restDenom = "denom"
)

func registerQueryRoutes(cliCtx context.CLIContext, r *mux.Router) {
	r.HandleFunc(fmt.Sprintf("/%s/claims/{%s}/{%s}", types.ModuleName, restOwner, restDenom), queryClaimsHandlerFn(cliCtx)).Methods("GET")
	r.HandleFunc(fmt.Sprintf("/%s/rewardperiods", types.ModuleName), queryRewardPeriodsHandlerFn(cliCtx)).Methods("GET")
	r.HandleFunc(fmt.Sprintf("/%s/claimperiods", types.ModuleName), queryClaimPeriodsHandlerFn(cliCtx)).Methods("GET")
	r.HandleFunc(fmt.Sprintf("/%s/parameters", types.ModuleName), queryParamsHandlerFn(cliCtx)).Methods("GET")
}

func queryClaimsHandlerFn(cliCtx context.CLIContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		cliCtx, ok := rest.ParseQueryHeightOrReturnBadRequest(w, cliCtx, r)
		if !ok {
			return
		}

		vars := mux.Vars(r)
		ownerBech32 := vars[types.RestClaimOwner]
		denom := vars[types.RestClaimCollateralType]

		owner, err := sdk.AccAddressFromBech32(ownerBech32)
		if err != nil {
			rest.WriteErrorResponse(w, http.StatusBadRequest, err.Error())
			return
		}

		queryParams := types.NewQueryClaimsParams(owner, denom)
		bz, err := cliCtx.Codec.MarshalJSON(queryParams)
		if err != nil {
			rest.WriteErrorResponse(w, http.StatusBadRequest, fmt.Sprintf("failed to marshal query params: %s", err))
			return
		}

		res, height, err := cliCtx.QueryWithData(fmt.Sprintf("custom/incentive/%s", types.QueryGetClaims), bz)
		if err != nil {
			rest.WriteErrorResponse(w, http.StatusInternalServerError, err.Error())
			return
		}

		cliCtx = cliCtx.WithHeight(height)
		rest.PostProcessResponse(w, cliCtx, res)
	}
}

func queryRewardPeriodsHandlerFn(cliCtx context.CLIContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		cliCtx, ok := rest.ParseQueryHeightOrReturnBadRequest(w, cliCtx, r)
		if !ok {
			return
		}

		route := fmt.Sprintf("custom/%s/%s", types.QuerierRoute, types.QueryGetRewardPeriods)

		res, height, err := cliCtx.QueryWithData(route, nil)
		if err != nil {
			rest.WriteErrorResponse(w, http.StatusInternalServerError, err.Error())
			return
		}

		cliCtx = cliCtx.WithHeight(height)
		rest.PostProcessResponse(w, cliCtx, res)
	}
}

func queryClaimPeriodsHandlerFn(cliCtx context.CLIContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		cliCtx, ok := rest.ParseQueryHeightOrReturnBadRequest(w, cliCtx, r)
		if !ok {
			return
		}

		route := fmt.Sprintf("custom/%s/%s", types.QuerierRoute, types.QueryGetClaimPeriods)

		res, height, err := cliCtx.QueryWithData(route, nil)
		if err != nil {
			rest.WriteErrorResponse(w, http.StatusInternalServerError, err.Error())
			return
		}

		cliCtx = cliCtx.WithHeight(height)
		rest.PostProcessResponse(w, cliCtx, res)
	}
}

func queryParamsHandlerFn(cliCtx context.CLIContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		cliCtx, ok := rest.ParseQueryHeightOrReturnBadRequest(w, cliCtx, r)
		if !ok {
			return
		}

		route := fmt.Sprintf("custom/%s/parameters", types.QuerierRoute)

		res, height, err := cliCtx.QueryWithData(route, nil)
		if err != nil {
			rest.WriteErrorResponse(w, http.StatusInternalServerError, err.Error())
			return
		}

		cliCtx = cliCtx.WithHeight(height)
		rest.PostProcessResponse(w, cliCtx, res)
	}
}