import { createServerFn } from "@tanstack/react-start"
import { getCookie, setCookie } from "@tanstack/react-start/server"
import {
	type AuthUser,
	LOGIN_MUTATION,
	normalizeAuthTokens,
} from "@wp-reactor/auth"
import { WOO_SESSION_COOKIE } from "@wp-reactor/commerce"
import { createServerGraphQLClient } from "@wp-reactor/headless-core"
import { runtimeEnv } from "../env"
import { authMiddleware } from "./authMiddleware"
import { useAppSession } from "./session"

// Wrappers serverFn MINCES autour des contrats du package @wp-reactor/auth
// (Option B). POST obligatoire : réponses personnalisées par la session, jamais
// cachables en edge.

async function establishSession(
	username: string,
	password: string,
): Promise<AuthUser> {
	const client = createServerGraphQLClient(runtimeEnv)

	// Transfert du panier invité → compte : on présente le woo-session guest.
	const guestSession = getCookie(WOO_SESSION_COOKIE)
	if (guestSession) {
		client.setHeader("woocommerce-session", `Session ${guestSession}`)
	}

	const res = await client.request(LOGIN_MUTATION, { username, password })
	if (!res?.login) throw new Error("Login failed")
	const { user, ...tokens } = res.login

	const session = await useAppSession()
	await session.update({ ...normalizeAuthTokens(tokens), user })

	// Panier rattaché au compte (Bearer) → cookie invité obsolète.
	if (guestSession) {
		setCookie(WOO_SESSION_COOKIE, "", { path: "/", maxAge: 0 })
	}
	return user
}

export const getCurrentUserServerFn = createServerFn({ method: "POST" })
	.middleware([authMiddleware])
	.handler(({ context }) => ({
		user: context.user,
		isAuthenticated: context.isAuthenticated,
	}))

export const loginServerFn = createServerFn({ method: "POST" })
	.inputValidator((data: { username: string; password: string }) => ({
		username: String(data.username),
		password: String(data.password),
	}))
	.handler(async ({ data }) => ({
		user: await establishSession(data.username, data.password),
	}))

export const logoutServerFn = createServerFn({ method: "POST" }).handler(
	async () => {
		const session = await useAppSession()
		await session.clear()
		return { ok: true }
	},
)