import type { EntryKey, UseInfiniteQueryData } from "@pinia/colada"
import { afterEach, beforeEach, describe, it } from "vitest"
import {
	clearQueryCache,
	disposeMockEndpoints,
	mockEndpoint,
	readQueryData,
	runInApp,
	seedQueryData,
} from "./test-helpers"
import useNotificationAPI from "./useNotificationAPI"

type NotificationPages = UseInfiniteQueryData<NotificationsResponse, number>

const LIST_KEY_A = ["notifications", "list", 10] as const
const LIST_KEY_B = ["notifications", "list", 5] as const

function makeNotificationAPI() {
	return runInApp(() => useNotificationAPI())
}

// cache seeds pass through the composable's JSON-based clone, so the
// fixture uses a string date — exactly what a cache round-trip produces
function makeNotification(id: string, read: boolean) {
	return {
		id,
		userId: "u1",
		organizationId: "org1",
		code: NotificationCode.DocumentNewComment,
		metadata: {
			userId: "u2",
			documentId: "d1",
			branchId: "b1",
			commentId: "c1",
			anchorBlockId: null,
		},
		read,
		createdAt: "2024-01-01T00:00:00.000Z",
	}
}

function makePage(
	notifications: NotificationsResponse["notifications"],
	pageCount = 1,
): NotificationsResponse {
	return { notifications, pageCount }
}

// what the cache holds for the given pages, loaded from the first one on
function makePages(...pages: NotificationsResponse[]): NotificationPages {
	return { pages, pageParams: pages.map((_page, index) => index + 1) }
}

function seedPages(key: EntryKey, ...pages: NotificationsResponse[]) {
	seedQueryData(key, makePages(...pages))
}

function getPages(key: EntryKey) {
	return readQueryData(key) as NotificationPages | undefined
}

function readStates(key: EntryKey) {
	return getPages(key)?.pages.map((page) =>
		page.notifications.map((n) => n.read),
	)
}

// creating a factory query eagerly loads it once; refresh() joins that
// in-flight load (or reuses its fresh result) instead of forcing a second
// request, which keeps the call accounting deterministic
describe("useNotificationAPI", { concurrent: false }, () => {
	// the tests share the app-wide query cache and the test-time endpoint
	// registry, so they cannot interleave
	beforeEach(clearQueryCache)

	afterEach(disposeMockEndpoints)

	describe("useFetchManyNotifications", () => {
		it("fetches the first notification page", async ({ expect }) => {
			const page = makePage([makeNotification("n1", false)])
			const listCalls = mockEndpoint("GET", "/api/notifications", () => page)
			const api = makeNotificationAPI()
			const list = runInApp(() => api.useFetchManyNotifications({ limit: 10 }))

			const result = await list.refresh()

			expect(result.data).toEqual(makePages(page))
			expect(list.hasNextPage.value).toBe(false)
			expect(listCalls).toHaveLength(1)
			expect(listCalls[0]?.query).toEqual({ limit: "10", page: "1" })
		})

		it("loads the next page while the server reports more", async ({
			expect,
		}) => {
			const listCalls = mockEndpoint("GET", "/api/notifications", (call) =>
				makePage([makeNotification(`n${String(call.query.page)}`, false)], 2),
			)
			const api = makeNotificationAPI()
			const list = runInApp(() => api.useFetchManyNotifications({ limit: 10 }))
			await list.refresh()
			expect(list.hasNextPage.value).toBe(true)

			await list.loadNextPage()

			expect(list.data.value).toEqual(
				makePages(
					makePage([makeNotification("n1", false)], 2),
					makePage([makeNotification("n2", false)], 2),
				),
			)
			expect(list.hasNextPage.value).toBe(false)
			expect(listCalls.map((call) => call.query.page)).toEqual(["1", "2"])
		})

		it("refetches every loaded page in order", async ({ expect }) => {
			const listCalls = mockEndpoint("GET", "/api/notifications", (call) =>
				makePage([makeNotification(`n${String(call.query.page)}`, false)], 2),
			)
			const api = makeNotificationAPI()
			const list = runInApp(() => api.useFetchManyNotifications({ limit: 10 }))
			await list.refresh()
			await list.loadNextPage()

			await list.refetch()

			expect(list.data.value?.pages).toHaveLength(2)
			expect(listCalls.map((call) => call.query.page)).toEqual([
				"1",
				"2",
				"1",
				"2",
			])
		})
	})

	describe("useFetchNotificationCount", () => {
		it.for([
			{ read: false, expected: "false" },
			{ read: true, expected: "true" },
		])(
			"fetches the count of notifications with read=$read",
			async ({ read, expected }, { expect }) => {
				const countCalls = mockEndpoint(
					"GET",
					"/api/notifications/count",
					() => ({ count: 3 }),
				)
				const api = makeNotificationAPI()
				const count = runInApp(() => api.useFetchNotificationCount({ read }))

				const result = await count.refresh()

				expect(result.data).toEqual({ count: 3 })
				expect(countCalls).toHaveLength(1)
				expect(countCalls[0]?.query).toEqual({ read: expected })
			},
		)
	})

	describe("markNotificationsRead", () => {
		it("marks every cached notification as read when no ids are given", async ({
			expect,
		}) => {
			const listCalls = mockEndpoint("GET", "/api/notifications", () =>
				makePage([]),
			)
			const countCalls = mockEndpoint(
				"GET",
				"/api/notifications/count",
				() => ({
					count: 0,
				}),
			)
			const putCalls = mockEndpoint(
				"PUT",
				"/api/notifications/read-status",
				() => ({}),
			)
			seedPages(
				LIST_KEY_A,
				makePage([makeNotification("n1", false), makeNotification("n2", true)]),
				makePage([makeNotification("n4", false)]),
			)
			seedPages(LIST_KEY_B, makePage([makeNotification("n3", false)]))
			const api = makeNotificationAPI()

			await api.markNotificationsRead.mutateAsync({ ids: [] })

			expect(readStates(LIST_KEY_A)).toEqual([[true, true], [true]])
			expect(readStates(LIST_KEY_B)).toEqual([[true]])
			expect(putCalls).toHaveLength(1)
			expect(putCalls[0]?.body).toEqual({ ids: [] })
			// the success invalidation only refetches active queries — the
			// seeded entries have no query attached, so nothing is fetched
			expect(listCalls).toHaveLength(0)
			expect(countCalls).toHaveLength(0)
		})

		it("marks only the notifications with the given ids as read", async ({
			expect,
		}) => {
			const listCalls = mockEndpoint("GET", "/api/notifications", () =>
				makePage([]),
			)
			const countCalls = mockEndpoint(
				"GET",
				"/api/notifications/count",
				() => ({
					count: 0,
				}),
			)
			const putCalls = mockEndpoint(
				"PUT",
				"/api/notifications/read-status",
				() => ({}),
			)
			seedPages(
				LIST_KEY_A,
				makePage([
					makeNotification("n1", false),
					makeNotification("n2", false),
				]),
				makePage([
					makeNotification("n4", false),
					makeNotification("n5", false),
				]),
			)
			seedPages(LIST_KEY_B, makePage([makeNotification("n3", false)]))
			const api = makeNotificationAPI()

			await api.markNotificationsRead.mutateAsync({ ids: ["n1", "n3", "n5"] })

			expect(readStates(LIST_KEY_A)).toEqual([
				[true, false],
				[false, true],
			])
			expect(readStates(LIST_KEY_B)).toEqual([[true]])
			expect(putCalls).toHaveLength(1)
			expect(putCalls[0]?.body).toEqual({ ids: ["n1", "n3", "n5"] })
			expect(listCalls).toHaveLength(0)
			expect(countCalls).toHaveLength(0)
		})

		it("rolls back the cached pages when the request fails", async ({
			expect,
		}) => {
			const listCalls = mockEndpoint("GET", "/api/notifications", () =>
				makePage([]),
			)
			const countCalls = mockEndpoint(
				"GET",
				"/api/notifications/count",
				() => ({
					count: 0,
				}),
			)
			const putCalls = mockEndpoint(
				"PUT",
				"/api/notifications/read-status",
				() => {
					throw createError({ statusCode: 500 })
				},
			)
			seedPages(
				LIST_KEY_A,
				makePage([makeNotification("n1", false)]),
				makePage([makeNotification("n3", false)]),
			)
			seedPages(LIST_KEY_B, makePage([makeNotification("n2", false)]))
			const api = makeNotificationAPI()

			await expect(
				api.markNotificationsRead.mutateAsync({ ids: [] }),
			).rejects.toThrow()

			expect(getPages(LIST_KEY_A)).toEqual(
				makePages(
					makePage([makeNotification("n1", false)]),
					makePage([makeNotification("n3", false)]),
				),
			)
			expect(getPages(LIST_KEY_B)).toEqual(
				makePages(makePage([makeNotification("n2", false)])),
			)
			expect(putCalls).toHaveLength(1)
			expect(listCalls).toHaveLength(0)
			expect(countCalls).toHaveLength(0)
		})

		it("skips the rollback when the cache changed after the optimistic update", async ({
			expect,
		}) => {
			let rejectPut: (err: unknown) => void = () => undefined
			let putReached: () => void = () => undefined
			const putReachedSignal = new Promise<void>((resolve) => {
				putReached = resolve
			})

			const listCalls = mockEndpoint("GET", "/api/notifications", () =>
				makePage([]),
			)
			const countCalls = mockEndpoint(
				"GET",
				"/api/notifications/count",
				() => ({
					count: 0,
				}),
			)
			const putCalls = mockEndpoint(
				"PUT",
				"/api/notifications/read-status",
				() => {
					putReached()

					return new Promise((_resolve, reject) => {
						rejectPut = reject
					})
				},
			)
			seedPages(LIST_KEY_A, makePage([makeNotification("n1", false)]))
			seedPages(LIST_KEY_B, makePage([makeNotification("n2", false)]))
			const api = makeNotificationAPI()

			const pending = api.markNotificationsRead.mutateAsync({ ids: [] })
			await putReachedSignal

			// the optimistic update landed; divergent data written afterwards
			// must survive the failure
			expect(readStates(LIST_KEY_A)).toEqual([[true]])
			const divergent = makePage([makeNotification("n9", false)])
			seedPages(LIST_KEY_A, divergent)
			rejectPut(createError({ statusCode: 500 }))

			await expect(pending).rejects.toThrow()
			expect(getPages(LIST_KEY_A)).toEqual(makePages(divergent))
			// the rollback is all-or-nothing, so the untouched entry keeps its
			// optimistic state too
			expect(readStates(LIST_KEY_B)).toEqual([[true]])
			expect(putCalls).toHaveLength(1)
			expect(listCalls).toHaveLength(0)
			expect(countCalls).toHaveLength(0)
		})

		it("skips cached entries that have no data yet", async ({ expect }) => {
			let resolveList: (page: NotificationsResponse) => void = () => undefined
			let rejectPut: (err: unknown) => void = () => undefined
			let putReached: () => void = () => undefined
			const putReachedSignal = new Promise<void>((resolve) => {
				putReached = resolve
			})

			// the list load stays pending for the whole mutation, so its cache
			// entry exists without data while the optimistic update runs
			const listCalls = mockEndpoint("GET", "/api/notifications", () => {
				return new Promise((resolve) => {
					resolveList = resolve
				})
			})
			const countCalls = mockEndpoint(
				"GET",
				"/api/notifications/count",
				() => ({
					count: 0,
				}),
			)
			const putCalls = mockEndpoint(
				"PUT",
				"/api/notifications/read-status",
				() => {
					putReached()

					return new Promise((_resolve, reject) => {
						rejectPut = reject
					})
				},
			)
			seedPages(LIST_KEY_B, makePage([makeNotification("n1", false)]))
			const api = makeNotificationAPI()
			const list = runInApp(() => api.useFetchManyNotifications({ limit: 10 }))

			const pending = api.markNotificationsRead.mutateAsync({ ids: [] })
			await putReachedSignal

			// reaching the request proves the data-less entry did not abort
			// the optimistic update; only the seeded entry was touched
			expect(getPages(LIST_KEY_A)).toBeUndefined()
			expect(readStates(LIST_KEY_B)).toEqual([[true]])
			rejectPut(createError({ statusCode: 500 }))

			await expect(pending).rejects.toThrow()
			// the data-less entry is filtered from the rollback comparison
			// too, so the rollback still restores the seeded entry
			expect(getPages(LIST_KEY_B)).toEqual(
				makePages(makePage([makeNotification("n1", false)])),
			)
			expect(putCalls).toHaveLength(1)
			expect(listCalls).toHaveLength(1)
			expect(countCalls).toHaveLength(0)

			// settle the deferred load so nothing stays in flight
			const resolved = makePage([makeNotification("n2", true)])
			resolveList(resolved)
			const result = await list.refresh()
			expect(result.data).toEqual(makePages(resolved))
		})
	})
})