import {
  ANONYMOUS_PRINCIPAL,
  createAuthenticatedPrincipal,
  createDevicePrincipal,
  type EkklesiaPrincipal,
  parseEkklesiaUserId,
} from "@ekklesia/contracts";
import { ACCOUNT_APPEARANCES, ACCOUNT_MOTION_PREFERENCES } from "@ekklesia/core/account";
import {
  type AuthorizationStore,
  CORE_ACCOUNT_SELF_MANAGE,
  CORE_PERMISSION_REGISTRY,
  createAuthorizationEvaluator,
} from "@ekklesia/core/authorization";
import type { EkklesiaIdentityRuntime } from "@ekklesia/core/identity";
import {
  composePlatformPermissionRegistry,
  createModuleUiPublicationRegistry,
  EMPTY_MODULE_REALTIME_REGISTRY,
  type LegacyModuleRuntimeServices,
  type ModuleDatabase,
} from "@ekklesia/core/modules";
import { EKKLESIA_APPEARANCES, EKKLESIA_MOTION_PREFERENCES } from "@ekklesia/design-tokens";
import { describe, expect, it, vi } from "vitest";
import { ACCOUNT_PATH, ACCOUNT_PREFERENCES_PATH } from "../src/account-routes.js";
import { createApiApp } from "../src/app.js";
import {
  createInMemoryAccountStore,
  type InMemoryAccountPerson,
} from "./support/in-memory-account-store.js";
import { testDashboardHostAssets } from "./support/dashboard-host-assets.js";
import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
import { emptyModuleConfiguration } from "./support/in-memory-module-configuration.js";
import {
  createInMemoryModuleLifecycleStore,
  moduleLifecycleSnapshotFor,
} from "./support/in-memory-module-lifecycle.js";
import { emptyModuleStorage } from "./support/in-memory-module-storage.js";
import { readyHealth } from "./support/ready-health.js";

/**
 * `GET /api/v1/account` and `PATCH /api/v1/account/preferences` (ADR 0062): a signed-in person's
 * own account and preferences, self-only by construction.
 */

const trustedOrigin = "https://dashboard.example.test";
const adaId = parseEkklesiaUserId("11111111-1111-4111-8111-111111111111");
const graceId = parseEkklesiaUserId("22222222-2222-4222-8222-222222222222");
const ada = createAuthenticatedPrincipal(adaId);

const people: readonly InMemoryAccountPerson[] = [
  { email: "ada@example.test", name: "Ada Lovelace", userId: adaId },
  {
    email: "grace@example.test",
    name: "Grace Hopper",
    preferences: { appearance: "light", motion: "reduce" },
    userId: graceId,
  },
];

interface Options {
  readonly principal?: EkklesiaPrincipal;
  readonly evaluationFails?: boolean;
}

function build(options: Options = {}) {
  const evaluator = createAuthorizationEvaluator({
    grants: { hasActiveGrant: async () => false },
    platformOwners: {
      isPlatformOwner: async () => {
        if (options.evaluationFails) {
          throw new Error("database down");
        }
        return false;
      },
    },
  });
  const runtime: EkklesiaIdentityRuntime = {
    handleAuthRequest: vi.fn(),
    resolvePrincipal: vi.fn().mockResolvedValue(options.principal ?? ada),
  };
  const account = createInMemoryAccountStore(people);
  const app = createApiApp({
    account,
    authorization: {
      evaluator,
      registry: composePlatformPermissionRegistry([]),
      store: {} as unknown as AuthorizationStore,
    },
    dashboard: createInMemoryDashboardStore(),
    dashboardHostAssets: testDashboardHostAssets(),
    health: readyHealth(),
    moduleConfiguration: emptyModuleConfiguration(),
    moduleLifecycle: {
      snapshot: moduleLifecycleSnapshotFor([], { modules: [] }),
      store: createInMemoryModuleLifecycleStore(),
    },
    moduleRealtime: EMPTY_MODULE_REALTIME_REGISTRY,
    moduleRoutes: Object.freeze([]),
    moduleServices: Object.freeze({
      database: Object.freeze({}) as unknown as ModuleDatabase,
    }) as LegacyModuleRuntimeServices,
    moduleStorage: emptyModuleStorage(),
    moduleUi: createModuleUiPublicationRegistry([]),
    runtime,
    trustedOrigins: [trustedOrigin],
  });
  return { account, app };
}

function patch(body: unknown, init: { origin?: string | null; raw?: string } = {}): RequestInit {
  const headers: Record<string, string> = { "Content-Type": "application/json" };
  if (init.origin !== null) {
    headers.Origin = init.origin ?? trustedOrigin;
  }
  return { body: init.raw ?? JSON.stringify(body), headers, method: "PATCH" };
}

describe("core.account.self.manage", () => {
  it("is an authenticated-baseline Core permission, so managing your own account needs no grant", () => {
    expect(CORE_PERMISSION_REGISTRY.get(CORE_ACCOUNT_SELF_MANAGE)?.baseline).toBe("authenticated");
  });

  it("holds Core's preference values equal to the design tokens' own", () => {
    expect([...ACCOUNT_APPEARANCES]).toEqual([...EKKLESIA_APPEARANCES]);
    expect([...ACCOUNT_MOTION_PREFERENCES]).toEqual([...EKKLESIA_MOTION_PREFERENCES]);
  });
});

describe("GET /api/v1/account", () => {
  it("returns the signed-in person's own name, email, and default preferences", async () => {
    const { app } = build();
    const response = await app.request(ACCOUNT_PATH);

    expect(response.status).toBe(200);
    expect(response.headers.get("cache-control")).toBe("no-store");
    expect(response.headers.get("vary")).toContain("Cookie");
    expect(await response.json()).toEqual({
      email: "ada@example.test",
      name: "Ada Lovelace",
      preferences: { appearance: "system", motion: "system" },
    });
  });

  it("returns exactly name, email, and preferences — nothing else about the account", async () => {
    const { app } = build();
    const body = (await (await app.request(ACCOUNT_PATH)).json()) as Record<string, unknown>;
    expect(Object.keys(body).sort()).toEqual(["email", "name", "preferences"]);
    expect(Object.keys(body.preferences as object).sort()).toEqual(["appearance", "motion"]);
  });

  it("refuses an anonymous caller", async () => {
    const { account, app } = build({ principal: ANONYMOUS_PRINCIPAL });
    const response = await app.request(ACCOUNT_PATH);

    expect(response.status).toBe(403);
    expect(await response.json()).toEqual({ code: "AUTHORIZATION_DENIED" });
    expect(account.requestedUserIds).toEqual([]);
  });

  it("refuses a paired display device, which has no account", async () => {
    const { account, app } = build({
      principal: createDevicePrincipal("33333333-3333-4333-8333-333333333333"),
    });
    const response = await app.request(ACCOUNT_PATH);

    expect(response.status).toBe(403);
    expect(account.requestedUserIds).toEqual([]);
  });

  it("reads only the session's account, whatever the request names", async () => {
    const { account, app } = build();
    const response = await app.request(`${ACCOUNT_PATH}?userId=${graceId}&id=${graceId}`, {
      headers: { "X-User-Id": graceId },
    });

    expect(((await response.json()) as { name: string }).name).toBe("Ada Lovelace");
    expect(account.requestedUserIds).toEqual([adaId]);
  });

  it("has no route that addresses another person's account", async () => {
    const { account, app } = build();
    for (const path of [`${ACCOUNT_PATH}/${graceId}`, `${ACCOUNT_PREFERENCES_PATH}/${graceId}`]) {
      expect((await app.request(path)).status).toBe(404);
      expect((await app.request(path, patch({ appearance: "dark" }))).status).toBe(404);
    }
    expect(account.requestedUserIds).toEqual([]);
  });

  it("is not found when the session's person no longer exists", async () => {
    const { app } = build({
      principal: createAuthenticatedPrincipal("99999999-9999-4999-8999-999999999999"),
    });
    const response = await app.request(ACCOUNT_PATH);

    expect(response.status).toBe(404);
    expect(await response.json()).toEqual({ code: "ACCOUNT_NOT_FOUND" });
  });

  it("reports a storage failure as a sanitized 503", async () => {
    const { account, app } = build();
    account.failWith("ACCOUNT_READ_FAILED");
    const response = await app.request(ACCOUNT_PATH);

    expect(response.status).toBe(503);
    expect(await response.json()).toEqual({ code: "ACCOUNT_READ_FAILED" });
  });

  it("reports an authorization outage as a 503, never as a denial", async () => {
    // The authenticated baseline needs no owner lookup, so an owner-lookup outage cannot deny it.
    const { app } = build({ evaluationFails: true });
    expect((await app.request(ACCOUNT_PATH)).status).toBe(200);
  });
});

describe("PATCH /api/v1/account/preferences", () => {
  it.each([
    ["appearance", "light"],
    ["appearance", "dark"],
    ["appearance", "system"],
    ["motion", "reduce"],
    ["motion", "allow"],
    ["motion", "system"],
  ] as const)("saves %s %s and returns everything in effect", async (name, value) => {
    const { app } = build();
    const response = await app.request(ACCOUNT_PREFERENCES_PATH, patch({ [name]: value }));

    expect(response.status).toBe(200);
    expect(response.headers.get("cache-control")).toBe("no-store");
    const body = (await response.json()) as Record<string, string>;
    expect(body[name]).toBe(value);
    expect(Object.keys(body).sort()).toEqual(["appearance", "motion"]);

    const read = (await (await app.request(ACCOUNT_PATH)).json()) as {
      preferences: Record<string, string>;
    };
    expect(read.preferences[name]).toBe(value);
  });

  it("changes only the preference named", async () => {
    const { app } = build();
    await app.request(ACCOUNT_PREFERENCES_PATH, patch({ appearance: "dark" }));
    const response = await app.request(ACCOUNT_PREFERENCES_PATH, patch({ motion: "reduce" }));

    expect(await response.json()).toEqual({ appearance: "dark", motion: "reduce" });
  });

  it.each([
    ["an empty object", {}],
    ["an unknown appearance", { appearance: "sepia" }],
    ["an unknown motion", { motion: "none" }],
    ["an unknown key", { appearance: "dark", radius: "large" }],
    ["another person's id", { appearance: "dark", userId: "22222222-2222-4222-8222-222222222222" }],
    ["an array", ["dark"]],
    ["null", null],
  ])("refuses %s with nothing changed", async (_label, body) => {
    const { account, app } = build();
    const response = await app.request(ACCOUNT_PREFERENCES_PATH, patch(body));

    expect(response.status).toBe(400);
    expect(await response.json()).toEqual({ code: "INVALID_REQUEST" });
    expect(account.requestedUserIds).toEqual([]);
  });

  it("refuses a body that is not JSON", async () => {
    const { app } = build();
    const response = await app.request(ACCOUNT_PREFERENCES_PATH, patch(undefined, { raw: "{" }));
    expect(response.status).toBe(400);
  });

  it("refuses an untrusted or missing Origin before anything else", async () => {
    const { account, app } = build();
    for (const origin of ["https://elsewhere.example.test", null] as const) {
      const response = await app.request(
        ACCOUNT_PREFERENCES_PATH,
        patch({ appearance: "dark" }, { origin }),
      );
      expect(response.status).toBe(403);
      expect(await response.json()).toEqual({ code: "UNTRUSTED_ORIGIN" });
    }
    expect(account.requestedUserIds).toEqual([]);
  });

  it("refuses an oversized body", async () => {
    const { app } = build();
    const response = await app.request(
      ACCOUNT_PREFERENCES_PATH,
      patch(undefined, { raw: JSON.stringify({ appearance: "dark", pad: "x".repeat(20_000) }) }),
    );
    expect(response.status).toBe(413);
  });

  it("refuses an anonymous caller and a device", async () => {
    for (const principal of [
      ANONYMOUS_PRINCIPAL,
      createDevicePrincipal("33333333-3333-4333-8333-333333333333"),
    ]) {
      const { account, app } = build({ principal });
      const response = await app.request(ACCOUNT_PREFERENCES_PATH, patch({ appearance: "dark" }));
      expect(response.status).toBe(403);
      expect(account.requestedUserIds).toEqual([]);
    }
  });

  it("changes only the session's own preferences, never another person's", async () => {
    const { account, app } = build();
    await app.request(
      `${ACCOUNT_PREFERENCES_PATH}?userId=${graceId}`,
      patch({ appearance: "dark", motion: "allow" }),
    );

    expect(account.requestedUserIds).toEqual([adaId]);
    expect((await account.readAccount(graceId))?.preferences).toEqual({
      appearance: "light",
      motion: "reduce",
    });
  });

  it("reports a storage failure as a sanitized 503", async () => {
    const { account, app } = build();
    account.failWith("ACCOUNT_WRITE_FAILED");
    const response = await app.request(ACCOUNT_PREFERENCES_PATH, patch({ appearance: "dark" }));

    expect(response.status).toBe(503);
    expect(await response.json()).toEqual({ code: "ACCOUNT_WRITE_FAILED" });
  });

  it("answers a preflight from the Dashboard origin with PATCH allowed", async () => {
    const { app } = build();
    const response = await app.request(ACCOUNT_PREFERENCES_PATH, {
      headers: {
        "Access-Control-Request-Method": "PATCH",
        Origin: trustedOrigin,
      },
      method: "OPTIONS",
    });
    expect(response.headers.get("access-control-allow-origin")).toBe(trustedOrigin);
    expect(response.headers.get("access-control-allow-methods")).toContain("PATCH");
  });
});