package verifreg

import (
	"github.com/filecoin-project/go-address"
	"github.com/filecoin-project/go-state-types/abi"
	"github.com/filecoin-project/go-state-types/big"
	"github.com/filecoin-project/lotus/chain/actors"
	"github.com/filecoin-project/lotus/chain/actors/adt"
	builtin3 "github.com/filecoin-project/specs-actors/v3/actors/builtin"
	"github.com/ipfs/go-cid"
	"golang.org/x/xerrors"
)

// Assumes that the bitwidth for v3 HAMTs is the DefaultHamtBitwidth
func getDataCap(store adt.Store, ver actors.Version, root cid.Cid, addr address.Address) (bool, abi.StoragePower, error) {
	if addr.Protocol() != address.ID {
		return false, big.Zero(), xerrors.Errorf("can only look up ID addresses")
	}

	vh, err := adt.AsMap(store, root, ver, builtin3.DefaultHamtBitwidth)
	if err != nil {
		return false, big.Zero(), xerrors.Errorf("loading verifreg: %w", err)
	}

	var dcap abi.StoragePower
	if found, err := vh.Get(abi.AddrKey(addr), &dcap); err != nil {
		return false, big.Zero(), xerrors.Errorf("looking up addr: %w", err)
	} else if !found {
		return false, big.Zero(), nil
	}

	return true, dcap, nil
}

// Assumes that the bitwidth for v3 HAMTs is the DefaultHamtBitwidth
func forEachCap(store adt.Store, ver actors.Version, root cid.Cid, cb func(addr address.Address, dcap abi.StoragePower) error) error {
	vh, err := adt.AsMap(store, root, ver, builtin3.DefaultHamtBitwidth)
	if err != nil {
		return xerrors.Errorf("loading verified clients: %w", err)
	}
	var dcap abi.StoragePower
	return vh.ForEach(&dcap, func(key string) error {
		a, err := address.NewFromBytes([]byte(key))
		if err != nil {
			return err
		}
		return cb(a, dcap)
	})
}