package config

import (
	"crypto/aes"
	"crypto/cipher"
	"crypto/rand"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"io"
	"io/fs"
	"net/http"
	"os"
	"path/filepath"
	"strings"

	"github.com/cloudflare/circl/sign/ed448"
	"github.com/libp2p/go-libp2p/core/crypto"
	"github.com/pkg/errors"
	"golang.org/x/crypto/sha3"
	"gopkg.in/yaml.v2"
)

type Config struct {
	Key                 *KeyConfig    `yaml:"key"`
	P2P                 *P2PConfig    `yaml:"p2p"`
	Engine              *EngineConfig `yaml:"engine"`
	DB                  *DBConfig     `yaml:"db"`
	ListenGRPCMultiaddr string        `yaml:"listenGrpcMultiaddr"`
	ListenRestMultiaddr string        `yaml:"listenRESTMultiaddr"`
	LogFile             string        `yaml:"logFile"`
}

func NewConfig(configPath string) (*Config, error) {
	file, err := os.Open(configPath)
	if err != nil {
		return nil, err
	}

	defer file.Close()

	d := yaml.NewDecoder(file)
	config := &Config{}

	if err := d.Decode(&config); err != nil {
		return nil, err
	}

	return config, nil
}

var BootstrapPeers = []string{
	"/dns/bootstrap.quilibrium.com/udp/8336/quic-v1/p2p/Qme3g6rJWuz8HVXxpDb7aV2hiFq8bZJNqxMmwzmASzfq1M",
	"/dns/quaalude.quilibrium.com/udp/8336/quic-v1/p2p/QmYruNcruYNgyTKeUqJSxjbuTFYWYDw2r5df9YKMGWCRKA",
	"/dns/quecifer.quilibrium.com/udp/8336/quic-v1/p2p/QmdWF9bGTH5mwJXkxrG859HA5r34MxXtMSTuEikSMDSESv",
	"/dns/quantum.quilibrium.com/udp/8336/quic-v1/p2p/QmbmVeKnSWK9HHAQHSS714XU3gx77TrS356JmHmKFj7q7M",
	"/dns/quidditas.quilibrium.com/udp/8336/quic-v1/p2p/QmR1rF5E9zAob9FZyMF7uTUM27D7GYtX9RaiSsNY9UP72J",
	"/dns/quillon.quilibrium.com/udp/8336/quic-v1/p2p/QmWgHv6z3tyimW4JvrvYRgsJEimgV7J2xbE7QEpFNPvAnB",
	"/dns/quidditch.quilibrium.com/udp/8336/quic-v1/p2p/QmbZEGuinaCndj4XLb6fteZmjmP3C1Tsgijmc5BGuUk8Ma",
	"/dns/quagmire.quilibrium.com/udp/8336/quic-v1/p2p/QmaQ9KAaKtqXhYSQ5ARQNnn8B8474cWGvvD6PgJ4gAtMrx",
	"/ip4/204.186.74.46/udp/8316/quic-v1/p2p/QmeqBjm3iX7sdTieyto1gys5ruQrQNPKfaTGcVQQWJPYDV",
	"/ip4/185.143.102.84/udp/8336/quic-v1/p2p/Qmce68gLLq9eMdwCcmd1ptfoC2nVoe861LF1cjdVHC2DwK",
	"/ip4/65.109.17.13/udp/8336/quic-v1/p2p/Qmc35n99eojSvW3PkbfBczJoSX92WmnnKh3Fg114ok3oo4",
	"/ip4/65.108.194.84/udp/8336/quic-v1/p2p/QmP8C7g9ZRiWzhqN2AgFu5onS6HwHzR6Vv1TCHxAhnCSnq",
	"/ip4/15.204.100.222/udp/8336/quic-v1/p2p/Qmef3Z3RvGg49ZpDPcf2shWtJNgPJNpXrowjUcfz23YQ3V",
	"/ip4/69.197.174.35/udp/8336/quic-v1/p2p/QmeprCaZKiymofPJgnp2ANR3F4pRus9PHHaxnJDh1Jwr1p",
	"/ip4/70.36.102.32/udp/8336/quic-v1/p2p/QmYriGRXCUiwFodqSoS4GgEcD7UVyxXPeCgQKmYne3iLSF",
	"/ip4/204.12.220.2/udp/8336/quic-v1/p2p/QmRw5Tw4p5v2vLPvVSAkQEiRPQGnWk9HM4xiSvgxF82CCw",
	"/ip4/209.159.149.14/udp/8336/quic-v1/p2p/Qmcq4Lmw45tbodvdRWZ8iGgy3rUcR3dikHTj1fBXP8VJqv",
	"/ip4/148.251.9.90/udp/8336/quic-v1/p2p/QmRpKmQ1W83s6moBFpG6D6nrttkqdQSbdCJpvfxDVGcs38",
	"/ip4/35.232.113.144/udp/8336/quic-v1/p2p/QmWxkBc7a17ZsLHhszLyTvKsoHMKvKae2XwfQXymiU66md",
	"/ip4/34.87.85.78/udp/8336/quic-v1/p2p/QmTGguT5XhtvZZwTLnNQTN8Bg9eUm1THWEneXXHGhMDPrz",
	"/ip4/34.81.199.27/udp/8336/quic-v1/p2p/QmTMMKpzCKJCwrnUzNu6tNj4P1nL7hVqz251245wsVpGNg",
	"/ip4/34.143.255.235/udp/8336/quic-v1/p2p/QmeifsP6Kvq8A3yabQs6CBg7prSpDSqdee8P2BDQm9EpP8",
	"/ip4/34.34.125.238/udp/8336/quic-v1/p2p/QmZdSyBJLm9UiDaPZ4XDkgRGXUwPcHJCmKoH6fS9Qjyko4",
	"/ip4/34.80.245.52/udp/8336/quic-v1/p2p/QmNmbqobt82Vre5JxUGVNGEWn2HsztQQ1xfeg6mx7X5u3f",
	"/dns/bravo-1.qcommander.sh/udp/8336/quic-v1/p2p/QmWFK1gVuhEqZdr8phTo3QbyLwjYmyivx31Zubqt7oR4XB",
	"/ip4/109.199.100.108/udp/8336/quic-v1/p2p/Qma9fgugQc17MDu4YRSvnhfhVre6AYZ3nZdW8dSUYbsWvm",
	"/ip4/47.251.49.193/udp/8336/quic-v1/p2p/QmP6ADPmMCsB8y82oFbrKTrwYWXt1CTMJ3jGNDXRHyYJgR",
	"/ip4/138.201.203.208/udp/8336/quic-v1/p2p/QmbNhSTd4Y64ZCbV2gAXYR4ZFDdfRBMfrgWsNg99JHxsJo",
	"/ip4/148.251.9.90/udp/8336/quic-v1/p2p/QmRpKmQ1W83s6moBFpG6D6nrttkqdQSbdCJpvfxDVGcs38",
	"/ip4/15.235.211.121/udp/8336/quic-v1/p2p/QmZHNLUSAFCkTwHiEE3vWay3wsus5fWYsNLFTFU6tPCmNR",
	"/ip4/63.141.228.58/udp/8336/quic-v1/p2p/QmezARggdWKa1sw3LqE3LfZwVvtuCpXpK8WVo8EEdfakJV",
	// purged peers (keep your node online to return to this list)
	// "/ip4/204.186.74.47/udp/8317/quic-v1/p2p/Qmd233pLUDvcDW3ama27usfbG1HxKNh1V9dmWVW1SXp1pd",
	// "/ip4/186.233.184.181/udp/8336/quic-v1/p2p/QmW6QDvKuYqJYYMP5tMZSp12X3nexywK28tZNgqtqNpEDL",
	// "/dns/quil.zanshindojo.org/udp/8336/quic-v1/p2p/QmXbbmtS5D12rEc4HWiHWr6e83SCE4jeThPP4VJpAQPvXq",
	// "/ip4/144.76.104.93/udp/8336/quic-v1/p2p/QmZejZ8DBGQ6foX9recW73GA6TqL6hCMX9ETWWW1Fb8xtx",
	// "/ip4/207.246.81.38/udp/8336/quic-v1/p2p/QmPBYgDy7snHon7PAn8nv1shApQBQz1iHb2sBBS8QSgQwW",
	// "/dns/abyssia.fr/udp/8336/quic-v1/p2p/QmS7C1UhN8nvzLJgFFf1uspMRrXjJqThHNN6AyEXp6oVUB",
	// "/ip4/51.15.18.247/udp/8336/quic-v1/p2p/QmYVaHXdFmHFeTa6oPixgjMVag6Ex7gLjE559ejJddwqzu",
	// "/ip4/35.232.113.144/udp/8336/quic-v1/p2p/QmWxkBc7a17ZsLHhszLyTvKsoHMKvKae2XwfQXymiU66md",
	// "/ip4/34.87.85.78/udp/8336/quic-v1/p2p/QmTGguT5XhtvZZwTLnNQTN8Bg9eUm1THWEneXXHGhMDPrz",
	// "/ip4/34.81.199.27/udp/8336/quic-v1/p2p/QmTMMKpzCKJCwrnUzNu6tNj4P1nL7hVqz251245wsVpGNg",
	// "/ip4/34.143.255.235/udp/8336/quic-v1/p2p/QmeifsP6Kvq8A3yabQs6CBg7prSpDSqdee8P2BDQm9EpP8",
	// "/ip4/34.34.125.238/udp/8336/quic-v1/p2p/QmZdSyBJLm9UiDaPZ4XDkgRGXUwPcHJCmKoH6fS9Qjyko4",
	// "/ip4/34.80.245.52/udp/8336/quic-v1/p2p/QmNmbqobt82Vre5JxUGVNGEWn2HsztQQ1xfeg6mx7X5u3f",
	// "/dns/quil.dfcnodes.eu/udp/8336/quic-v1/p2p/QmQaFmbYVrKSwoen5UQdaqyDq4QhXfSSLDVnYpYD4SF9tX",
}

type Signature struct {
	PublicKeyHex string `json:"publicKeyHex"`
	SignatureHex string `json:"signatureHex"`
}
type SignedGenesisUnlock struct {
	GenesisSeedHex string      `json:"genesisSeedHex"`
	Signatures     []Signature `json:"signatures"`
	// Until the broader primitives are in place, a beacon needs to kick this off
	Beacon []byte `json:"beacon"`
}

var Signatories = []string{
	"b1214da7f355f5a9edb7bcc23d403bdf789f070cca10db2b4cadc22f2d837afb650944853e35d5f42ef3c4105b802b144b4077d5d3253e4100",
	"de4cfe7083104bfe32f0d4082fa0200464d8b10804a811653eedda376efcad64dd222f0f0ceb0b8ae58abe830d7a7e3f3b2d79d691318daa00",
	"540237a35e124882d6b64e7bb5718273fa338e553f772b77fe90570e45303762b34131bdcb6c0b9f2cf9e393d9c7e0f546eeab0bcbbd881680",
	"fbe4166e37f93f90d2ebf06305315ae11b37e501d09596f8bde11ba9d343034fbca80f252205aa2f582a512a72ad293df371baa582da072900",
	"4160572e493e1bf15c44e055b11bf75230c76c7d2c67b48066770ab03dfd5ed34c97b9a431ec18578c83a0df9250b8362c38068650e8b01400",
	"45170b626884b85d61ae109f2aa9b0e1ecc18b181508431ea6308f3869f2adae49da9799a0a594eaa4ef3ad492518fb1729decd44169d40d00",
	"92cd8ee5362f3ae274a75ab9471024dbc144bff441ed8af7d19750ac512ff51e40e7f7b01e4f96b6345dd58878565948c3eb52c53f250b5080",
	"001a4cbfce5d9aeb7e20665b0d236721b228a32f0baee62ffa77f45b82ecaf577e8a38b7ef91fcf7d2d2d2b504f085461398d30b24abb1d700",
	"65b835071731c6e785bb2d107c7d85d8a537d79c435c3f42bb2f87027f93f858d7b37c598cef267a5db46e345f7a6f81969b465686657d1e00",
	"4507626f7164e7d8c304c07ff8d2e23c113fe108b221d2e60672f4d07750345815e2b4b3cc3df4d3466bf2f669c35c3172e06511270612ab00",
	"4fb2537345e46be3d5f96340c1441007501702dd5bfaf6dbf6943bbefceca8fb2b94ec0a8a1a2f49850fbe1d10244889a4f40abfa9e0c9e000",
	"57be2861faf0fffcbfd122c85c77010dce8f213030905781b85b6f345d912c7b5ace17797d9810899dfb8d13e7c8369595740725ab3dd5bd00",
	"61628beef8f6964466fd078d6a2b90a397ab0777a14b9728227fd19f36752f9451b1a8d780740a0b9a8ce3df5f89ca7b9ff17de9274a270980",
	"5547afc71b02821e2f5bfdd30fbe1374c3853898deff20a1b5cc729b8e81670fbbb9d1e917f85d153ea4b26bbf6f9c546dc1b64b9916608d80",
	"81d63a45f068629f568de812f18be5807bfe828a830097f09cf02330d6acd35e3607401df3fda08b03b68ea6e68afd506b23506b11e87a0f80",
	"6e2872f73c4868c4286bef7bfe2f5479a41c42f4e07505efa4883c7950c740252e0eea78eef10c584b19b1dcda01f7767d3135d07c33244100",
	"a114b061f8d35e3f3497c8c43d83ba6b4af67aa7b39b743b1b0a35f2d66110b5051dd3d86f69b57122a35b64e624b8180bee63b6152fce4280",
}

var unlock *SignedGenesisUnlock

func DownloadAndVerifyGenesis() (*SignedGenesisUnlock, error) {
	if unlock != nil {
		return unlock, nil
	}

	resp, err := http.Get("https://releases.quilibrium.com/stasis")
	if err != nil || resp.StatusCode != 200 {
		fmt.Println("Stasis lock not yet released.")
		return nil, errors.New("stasis lock not yet released")
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}

	checkUnlock := &SignedGenesisUnlock{}
	err = json.Unmarshal(body, checkUnlock)
	if err != nil {
		return nil, err
	}

	count := 0

	genesisSeed, err := hex.DecodeString(checkUnlock.GenesisSeedHex)
	if err != nil {
		return nil, err
	}

	digest := sha3.Sum256(genesisSeed)
	for i := 1; i <= len(Signatories); i++ {
		pubkey, _ := hex.DecodeString(Signatories[i-1])
		checksig := ""
		for _, sig := range checkUnlock.Signatures {
			if sig.PublicKeyHex == Signatories[i-1] {
				checksig = sig.PublicKeyHex
				break
			}
		}

		if checksig == "" {
			continue
		}

		sig, err := hex.DecodeString(Signatories[i-1])
		if err != nil {
			return nil, err
		}

		if !ed448.Verify(pubkey, digest[:], sig, "") {
			fmt.Printf("Failed signature check for signatory #%d\n", i)
			return nil, err
		}
		count++
	}

	if count < len(Signatories)/2+len(Signatories)%2 {
		fmt.Printf("Quorum on signatures not met")
		return nil, err
	}

	fmt.Println("Stasis lock released. Welcome to 2.0.")
	unlock = checkUnlock
	return unlock, err
}

var StasisSeed = "737461736973"

func LoadConfig(configPath string, proverKey string, skipGenesisCheck bool) (
	*Config,
	error,
) {
	info, err := os.Stat(configPath)
	if os.IsNotExist(err) {
		fmt.Println("Creating config directory " + configPath)
		if err = os.Mkdir(configPath, fs.FileMode(0700)); err != nil {
			panic(err)
		}
	} else {
		if err != nil {
			panic(err)
		}

		if !info.IsDir() {
			panic(configPath + " is not a directory")
		}
	}

	file, err := os.Open(filepath.Join(configPath, "config.yml"))
	saveDefaults := false
	if err != nil {
		if errors.Is(err, os.ErrNotExist) {
			saveDefaults = true
		} else {
			return nil, err
		}
	}

	genesisSeed := StasisSeed

	if !skipGenesisCheck {
		output, err := DownloadAndVerifyGenesis()
		if err == nil {
			genesisSeed = output.GenesisSeedHex
		}
	}

	config := &Config{
		DB: &DBConfig{
			Path: configPath + "/store",
		},
		Key: &KeyConfig{
			KeyStore: KeyManagerTypeFile,
			KeyStoreFile: &KeyStoreFileConfig{
				Path: filepath.Join(configPath, "keys.yml"),
			},
		},
		P2P: &P2PConfig{
			ListenMultiaddr: "/ip4/0.0.0.0/udp/8336/quic-v1",
			BootstrapPeers:  BootstrapPeers,
			PeerPrivKey:     "",
			Network:         0,
		},
		Engine: &EngineConfig{
			ProvingKeyId:         "default-proving-key",
			Filter:               "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
			GenesisSeed:          genesisSeed,
			MaxFrames:            -1,
			PendingCommitWorkers: 4,
		},
	}

	if saveDefaults {
		fmt.Println("Generating default config...")
		fmt.Println("Generating random host key...")
		privkey, _, err := crypto.GenerateEd448Key(rand.Reader)
		if err != nil {
			panic(err)
		}

		hostKey, err := privkey.Raw()
		if err != nil {
			panic(err)
		}

		config.P2P.PeerPrivKey = hex.EncodeToString(hostKey)

		fmt.Println("Generating keystore key...")
		keystoreKey := make([]byte, 32)
		if _, err := rand.Read(keystoreKey); err != nil {
			panic(err)
		}

		config.Key.KeyStoreFile.EncryptionKey = hex.EncodeToString(keystoreKey)

		if multiAddr := os.Getenv("DEFAULT_LISTEN_GRPC_MULTIADDR"); multiAddr != "" {
			config.ListenGRPCMultiaddr = multiAddr
			config.ListenRestMultiaddr = os.Getenv("DEFAULT_LISTEN_REST_MULTIADDR")
		}

		if multiAddr := os.Getenv("DEFAULT_STATS_MULTIADDR"); multiAddr != "" {
			config.Engine.StatsMultiaddr = multiAddr
		}

		fmt.Println("Saving config...")
		if err = SaveConfig(configPath, config); err != nil {
			panic(err)
		}

		keyfile, err := os.OpenFile(
			filepath.Join(configPath, "keys.yml"),
			os.O_CREATE|os.O_RDWR,
			fs.FileMode(0600),
		)
		if err != nil {
			panic(err)
		}

		if proverKey != "" {
			provingKey, err := hex.DecodeString(proverKey)
			if err != nil {
				panic(err)
			}

			iv := [12]byte{}
			rand.Read(iv[:])
			aesCipher, err := aes.NewCipher(keystoreKey)
			if err != nil {
				return nil, errors.Wrap(err, "could not construct cipher")
			}

			gcm, err := cipher.NewGCM(aesCipher)
			if err != nil {
				return nil, errors.Wrap(err, "could not construct block")
			}

			ciphertext := gcm.Seal(nil, iv[:], provingKey, nil)
			ciphertext = append(append([]byte{}, iv[:]...), ciphertext...)

			provingPubKey := ed448.PrivateKey(provingKey).Public().(ed448.PublicKey)

			keyfile.Write([]byte(
				"default-proving-key:\n  id: default-proving-key\n" +
					"  type: 0\n  privateKey: " + hex.EncodeToString(ciphertext) + "\n" +
					"  publicKey: " + hex.EncodeToString(provingPubKey) + "\n"))
		} else {
			keyfile.Write([]byte("null:\n"))
		}

		keyfile.Close()

		if file, err = os.Open(
			filepath.Join(configPath, "config.yml"),
		); err != nil {
			panic(err)
		}
	}

	defer file.Close()
	d := yaml.NewDecoder(file)
	if err := d.Decode(&config); err != nil {
		return nil, err
	}

	if config.Engine.GenesisSeed == "00" {
		config.Engine.GenesisSeed = genesisSeed
	}

	// upgrade quic string to quic-v1
	if strings.HasSuffix(config.P2P.ListenMultiaddr, "/quic") {
		config.P2P.ListenMultiaddr += "-v1"
	}

	// Slight trick here to get people on the latest bootstrap list –
	// if it's empty, always use latest, if it has the Q bootstrap node, always
	// use latest.
	if len(config.P2P.BootstrapPeers) == 0 ||
		config.P2P.BootstrapPeers[0][:30] == "/dns/bootstrap.quilibrium.com/" {
		config.P2P.BootstrapPeers = BootstrapPeers
	} else {
		peers := make([]string, len(config.P2P.BootstrapPeers))
		for i, p := range config.P2P.BootstrapPeers {
			// upgrade quic strings to quic-v1
			peers[i] = strings.Replace(p, "/quic/", "/quic-v1/", 1)
		}
		config.P2P.BootstrapPeers = peers
	}

	return config, nil
}

func SaveConfig(configPath string, config *Config) error {
	file, err := os.OpenFile(
		filepath.Join(configPath, "config.yml"),
		os.O_CREATE|os.O_RDWR,
		os.FileMode(0600),
	)
	if err != nil {
		return err
	}

	defer file.Close()

	d := yaml.NewEncoder(file)

	if err := d.Encode(config); err != nil {
		return err
	}

	return nil
}

func PrintLogo() {
	fmt.Println("████████████████████████████████████████████████████████████████████████████████")
	fmt.Println("████████████████████████████████████████████████████████████████████████████████")
	fmt.Println("██████████████████████████████                    ██████████████████████████████")
	fmt.Println("█████████████████████████                              █████████████████████████")
	fmt.Println("█████████████████████                                      █████████████████████")
	fmt.Println("██████████████████                                            ██████████████████")
	fmt.Println("████████████████                     ██████                     ████████████████")
	fmt.Println("██████████████                ████████████████████                ██████████████")
	fmt.Println("█████████████             ████████████████████████████              ████████████")
	fmt.Println("███████████            ██████████████████████████████████            ███████████")
	fmt.Println("██████████           ██████████████████████████████████████           ██████████")
	fmt.Println("█████████          ██████████████████████████████████████████          █████████")
	fmt.Println("████████          ████████████████████████████████████████████          ████████")
	fmt.Println("███████          ████████████████████      ████████████████████          ███████")
	fmt.Println("██████          ███████████████████          ███████████████████          ██████")
	fmt.Println("█████          ███████████████████            ███████████████████          █████")
	fmt.Println("█████         ████████████████████            ████████████████████         █████")
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	fmt.Println("████        █████████████████████████      █████████████████████████        ████")
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	fmt.Println("█████        ████████████            ██████            ████████████        █████")
	fmt.Println("█████         █████████            ██████████            █████████         █████")
	fmt.Println("██████         ███████           █████████████             ███████        ██████")
	fmt.Println("██████          ████████       █████████████████            ████████      ██████")
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	fmt.Println("██████████            ██████████████████████████████████           █████████████")
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	fmt.Println("█████████████               ███████████████████████████████            █████████")
	fmt.Println("███████████████                 ████████████████    █████████            ███████")
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	fmt.Println("████████████████████                                    █████████         ██████")
	fmt.Println("███████████████████████                                  ██████████     ████████")
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	fmt.Println("████████████████████████████████████████████████████████████████████████████████")
}

func PrintVersion() {
	patch := GetPatchNumber()
	patchString := ""
	if patch != 0x00 {
		patchString = fmt.Sprintf("-p%d", patch)
	}
	fmt.Println(" ")
	fmt.Println("                      Quilibrium Node - v" + GetVersionString() + patchString + " – Dusk")
}