package sql

import (
	"context"

	"emperror.dev/errors"
	"git.sleepycat.moe/sam/mercury/internal/database"
	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgconn"
	"github.com/keegancsmith/sqlf"
	"github.com/oklog/ulid/v2"
	"golang.org/x/crypto/bcrypt"
)

// AccountStore is the interface to accounts in the database.
type AccountStore struct {
	q Querier
}

// NewAccountStore creates a new AccountStore instance.
func NewAccountStore(q Querier) *AccountStore {
	return &AccountStore{q: q}
}

// ByID gets an account by its ID.
func (s *AccountStore) ByID(ctx context.Context, id ulid.ULID) (a database.Account, err error) {
	q := sqlf.Sprintf("SELECT * FROM accounts WHERE id = %s", id)

	a, err = Get[database.Account](ctx, s.q, q)
	if err != nil {
		if errors.Cause(err) == pgx.ErrNoRows {
			return a, ErrNotFound
		}
		return a, errors.Wrap(err, "getting account")
	}
	return a, nil
}

// ByUsername gets an account by its username.
func (s *AccountStore) ByUsername(ctx context.Context, username string, host *string) (a database.Account, err error) {
	q := sqlf.Sprintf("SELECT * FROM accounts WHERE username = %s AND host = %v", username, host)

	a, err = Get[database.Account](ctx, s.q, q)
	if err != nil {
		if errors.Cause(err) == pgx.ErrNoRows {
			return a, ErrNotFound
		}
		return a, errors.Wrap(err, "getting account")
	}
	return a, nil
}

const PasswordCost = 15

func (s *AccountStore) CreateLocal(
	ctx context.Context,
	username string,
	email string,
	password []byte,
) (a database.Account, err error) {
	hash, err := bcrypt.GenerateFromPassword(password, PasswordCost)
	if err != nil {
		return a, errors.Wrap(err, "hashing password")
	}

	q := sqlf.Sprintf(
		"INSERT INTO accounts (id, username, host, email, password) VALUES (%s, %v, NULL, %v, %v) RETURNING *",
		makeULID(), username, email, hash)

	a, err = Get[database.Account](ctx, s.q, q)
	if err != nil {
		pge := &pgconn.PgError{}
		if errors.As(err, &pge) {
			// unique constraint violation
			if pge.Code == "23505" {
				return a, ErrUsernameTaken
			}
		}

		return a, errors.Wrap(err, "creating account")
	}
	return a, nil
}