package main

import (
	"crypto/rand"
	"database/sql"
	"encoding/base64"
	"fmt"
	"log"
	_ "github.com/go-sql-driver/mysql"
	"github.com/go-webauthn/webauthn/webauthn"
)

type InMem struct {
	// TODO: it would be nice to have a mutex here
	// TODO: use pointers to avoid copying
	users    map[string]PasskeyUser
	sessions map[string]webauthn.SessionData

	log* log.Logger
	db*  sql.DB
}

func (i *InMem) GenSessionID() (string, error) {
	b := make([]byte, 32)
	_, err := rand.Read(b)
	if err != nil {
		return "", err
	}

	return base64.URLEncoding.EncodeToString(b), nil

}

func NewInMem(log *log.Logger, db *sql.DB) *InMem {
	return &InMem{
		users:    make(map[string]PasskeyUser),
		sessions: make(map[string]webauthn.SessionData),
		log:      log,
		db:		  db,
	}
}

func (i *InMem) GetSession(token string) (webauthn.SessionData, bool) {
	i.log.Printf("[DEBUG] GetSession: %v", i.sessions[token])
	val, ok := i.sessions[token]

	return val, ok
}

func (i *InMem) SaveSession(token string, data webauthn.SessionData) {
	i.log.Printf("[DEBUG] SaveSession: %s - %v", token, data)
	i.sessions[token] = data
}

func (i *InMem) DeleteSession(token string) {
	i.log.Printf("[DEBUG] DeleteSession: %v", token)
	delete(i.sessions, token)
}

func (i *InMem) GetOrCreateUser(userName string) PasskeyUser {
	i.log.Printf("[DEBUG] GetOrCreateUser: %v", userName)
	if _, ok := i.users[userName]; !ok {
		i.log.Printf("[DEBUG] GetOrCreateUser: creating new user: %v", userName)
		i.users[userName] = &User{
			ID:          []byte(userName),
			DisplayName: userName,
			Name:        userName,
		}
	}

	return i.users[userName]
}

func (i *InMem) SaveUser(user PasskeyUser) {
	username := user.WebAuthnName()
	rpid := "oworganizer.com"
	kid := base64.StdEncoding.EncodeToString(user.WebAuthnCredentials()[0].Descriptor().CredentialID)
	aaguid := base64.StdEncoding.EncodeToString(user.WebAuthnCredentials()[0].Authenticator.AAGUID)
	publicKey := base64.StdEncoding.EncodeToString(user.WebAuthnCredentials()[0].PublicKey)
	attestationType := user.WebAuthnCredentials()[0].AttestationType
	attestationFormat := user.WebAuthnCredentials()[0].AttestationFormat
	attestation := user.WebAuthnCredentials()[0].Attestation.ClientDataJSON

	_, err = i.db.Exec("INSERT INTO users (username, rpid, kid, aaguid, public_key, attestation_type, attestation_format, attestation) VALUES (?, ?, ?, ?, ?, ?, ?, ?)", 
		username, rpid, kid, aaguid, publicKey, attestationType, attestationFormat, attestation)
    if err != nil {
        panic(err.Error())
    }
    fmt.Println("Yay, values added!")

	i.log.Printf("[DEBUG] SaveUser: %v", user.WebAuthnName())
	i.users[user.WebAuthnName()] = user
}