package genesis

import (
	"encoding/hex"

	"github.com/ipfs/go-cid"
	blocks "github.com/ipfs/go-libipfs/blocks"
	"github.com/multiformats/go-multihash"
)

const genesisMultihashString = "1220107d821c25dc0735200249df94a8bebc9c8e489744f86a4ca8919e81f19dcd72"
const genesisBlockHex = "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"

var cidBuilder = cid.V1Builder{Codec: cid.DagCBOR, MhType: multihash.SHA2_256}

func expectedCid() cid.Cid {
	mh, err := multihash.FromHexString(genesisMultihashString)
	if err != nil {
		panic(err)
	}
	return cid.NewCidV1(cidBuilder.Codec, mh)
}

func getGenesisBlock() (blocks.Block, error) {
	genesisBlockData, err := hex.DecodeString(genesisBlockHex)
	if err != nil {
		return nil, err
	}

	genesisCid, err := cidBuilder.Sum(genesisBlockData)
	if err != nil {
		return nil, err
	}

	block, err := blocks.NewBlockWithCid(genesisBlockData, genesisCid)
	if err != nil {
		return nil, err
	}

	return block, nil
}