findOAuthUser: async()

in packages/better-auth/src/db/internal-adapter.ts [530:610]
80 lines of code
6 McCabe index (conditional complexity)

		findOAuthUser: async (
			email: string,
			accountId: string,
			providerId: string,
		) => {
			// we need to find account first to avoid missing user if the email changed with the provider for the same account
			const account = await adapter
				.findMany<Account>({
					model: "account",
					where: [
						{
							value: accountId,
							field: "accountId",
						},
					],
				})
				.then((accounts) => {
					return accounts.find((a) => a.providerId === providerId);
				});
			if (account) {
				const user = await adapter.findOne<User>({
					model: "user",
					where: [
						{
							value: account.userId,
							field: "id",
						},
					],
				});
				if (user) {
					return {
						user,
						accounts: [account],
					};
				} else {
					const user = await adapter.findOne<User>({
						model: "user",
						where: [
							{
								value: email.toLowerCase(),
								field: "email",
							},
						],
					});
					if (user) {
						return {
							user,
							accounts: [account],
						};
					}
					return null;
				}
			} else {
				const user = await adapter.findOne<User>({
					model: "user",
					where: [
						{
							value: email.toLowerCase(),
							field: "email",
						},
					],
				});
				if (user) {
					const accounts = await adapter.findMany<Account>({
						model: "account",
						where: [
							{
								value: user.id,
								field: "userId",
							},
						],
					});
					return {
						user,
						accounts: accounts || [],
					};
				} else {
					return null;
				}
			}
		},