package profile

import (
	"encoding/hex"
	"time"
)

// Quicknet Provider Profile V1 parameters, pinned in the binary (spec §12).
// No relay, API or ciphertext can replace them (spec §13, §35).
const (
	QuicknetID          = "datekeys:quicknet:v1"
	QuicknetNetwork     = "quicknet"
	QuicknetChainHash   = "52db9ba70e0cc0f6eaf7803dd07447a1f5477735fd3f661792ba94600c84e971"
	QuicknetPublicKey   = "83cf0f2896adee7eb8b5f01fcad3912212c437e0073e911fb90022d3e760183c8c4b450b6a0a6c3ac6a5776a2d1064510d1fec758c921cc22b0e17e63aaf4bcb5ed66304de9cf809bd274ca73bab4af5a6e9c76a4bc09e76eae8991ef5ece45a"
	QuicknetGenesisSeed = "f477d5c89f21a17c863a7f937c6a6d15859414d2be09cd448d4279af331c5d3e"
	QuicknetGenesisTime = int64(1692803367)
	QuicknetPeriod      = 3 * time.Second
	QuicknetScheme      = "bls-unchained-g1-rfc9380"

	// QuicknetProfileHash is profile_hash of the Quicknet profile: SHA-256 of
	// its exact Deterministic CBOR (spec §11). It is the first official vector,
	// frozen in testdata/vectors/profile_quicknet.json, and part of the root of
	// trust of spec §13: Default refuses to build if the compiled-in
	// parameters do not reproduce it.
	QuicknetProfileHash = "4147645109798ecbc9f630c2f709835bb5846fe7911a6bd5c5755e25ade2ada4"
)

// Quicknet returns a fresh copy of the pinned Quicknet Provider Profile V1.
// A function instead of a package variable keeps the root of trust free of
// shared mutable state.
func Quicknet() *Profile {
	p := &Profile{
		ID:          QuicknetID,
		Provider:    ProviderDrand,
		Network:     QuicknetNetwork,
		PublicKey:   mustHex(QuicknetPublicKey),
		Period:      QuicknetPeriod,
		GenesisTime: QuicknetGenesisTime,
		Scheme:      QuicknetScheme,
	}
	copy(p.ChainHash[:], mustHex(QuicknetChainHash))
	copy(p.GenesisSeed[:], mustHex(QuicknetGenesisSeed))
	return p
}

// mustHex decodes compile-time constants only.
func mustHex(s string) []byte {
	b, err := hex.DecodeString(s)
	if err != nil {
		panic("profile: invalid pinned constant: " + err.Error())
	}
	return b
}