import { describe, expect, it } from "vitest";
import mongoose from "mongoose";
import { Business } from "@/lib/server/models/Business";
import { Branch } from "@/lib/server/models/Branch";
import { User } from "@/lib/server/models/User";
import { Product } from "@/lib/server/models/Product";
import { Purchase } from "@/lib/server/models/Purchase";
import { backfillPurchaseMovements, stockOf, getStockLevels } from "@/lib/server/stock";
import * as branches from "@/app/api/branches/route";
import * as branchById from "@/app/api/branches/[id]/route";
import * as users from "@/app/api/users/route";
import * as invites from "@/app/api/invites/[token]/route";
import * as reinvite from "@/app/api/users/[id]/invite/route";
import * as login from "@/app/api/auth/login/route";
import * as products from "@/app/api/products/route";
import * as productById from "@/app/api/products/[id]/route";
import * as purchases from "@/app/api/purchases/route";
import * as profit from "@/app/api/reports/profit/route";
import * as cash from "@/app/api/transactions/cash/route";
import * as adjustments from "@/app/api/stock/adjustments/route";
import * as transfers from "@/app/api/stock/transfers/route";
import { json, makeTenant, params, req, uuid, type Tenant, db } from "./helpers";

async function setPlan(t: Tenant, tier: string, subscriptionStatus: string) {
  await Business.updateOne({ _id: t.businessId }, { tier, subscriptionStatus });
}

const newBranch = (name: string) => ({ branchName: name, locationCity: "Nakuru" });

describe("F-01 trial branch allowance", () => {
  it("lets a trialling Starter business run two branches, not three", async () => {
    const t = await makeTenant(); // already has branches A and B
    await setPlan(t, "STARTER", "TRIALING");
    const third = await branches.POST(req("POST", "/x", { as: t.owner, body: newBranch("C") }));
    expect(third.status).toBe(403);
    expect((await third.json()).error).toMatch(/free trial allows 2/);
  });

  it("counts only active branches, and a paid Starter plan allows one", async () => {
    const t = await makeTenant();
    await setPlan(t, "STARTER", "TRIALING");
    await db(() => Branch.updateOne({ _id: t.branchB }, { isActive: false }));
    expect((await branches.POST(req("POST", "/x", { as: t.owner, body: newBranch("C") }))).status).toBe(201);

    await setPlan(t, "STARTER", "ACTIVE");
    expect((await branches.POST(req("POST", "/x", { as: t.owner, body: newBranch("D") }))).status).toBe(403);
  });
});

describe("F-06 branch deactivation", () => {
  it("refuses while the branch still holds stock or active staff, then succeeds once emptied", async () => {
    const t = await makeTenant();
    await adjustments.POST(
      req("POST", "/x", { as: t.owner, body: { clientUuid: uuid(), branchId: t.branchB, productId: t.water20, mode: "DELTA", quantity: 4 } })
    );
    const deactivate = () =>
      branchById.PATCH(req("PATCH", "/x", { as: t.owner, body: { isActive: false } }), params({ id: t.branchB }));

    const withStock = await deactivate();
    expect(withStock.status).toBe(409);
    expect((await withStock.json()).error).toMatch(/4 x 20L Jerrycan/);

    await transfers.POST(
      req("POST", "/x", {
        as: t.owner,
        body: { clientUuid: uuid(), fromBranchId: t.branchB, toBranchId: t.branchA, productId: t.water20, quantity: 4 },
      })
    );
    const withStaff = await deactivate();
    expect(withStaff.status).toBe(409);
    expect((await withStaff.json()).error).toMatch(/active staff/);

    await db(() => User.updateOne({ _id: t.cashierB.id }, { isActive: false }));
    expect((await deactivate()).status).toBe(200);

    // Hidden from pickers, kept on the Branches page.
    const active = await json(await branches.GET(req("GET", "/api/branches", { as: t.owner })));
    const all = await json(await branches.GET(req("GET", "/api/branches?includeInactive=1", { as: t.owner })));
    expect(active.body.branches.map((b: any) => b._id)).toEqual([t.branchA]);
    expect(all.body.branches).toHaveLength(2);
  });

  it("will not reactivate a branch past the plan's limit", async () => {
    const t = await makeTenant();
    await db(() => Branch.updateOne({ _id: t.branchB }, { isActive: false }));
    await setPlan(t, "STARTER", "ACTIVE");
    const res = await branchById.PATCH(req("PATCH", "/x", { as: t.owner, body: { isActive: true } }), params({ id: t.branchB }));
    expect(res.status).toBe(403);
  });
});

describe("F-03 report period validation", () => {
  it("rejects a reversed period instead of showing an empty report", async () => {
    const t = await makeTenant();
    const res = await profit.GET(req("GET", "/api/reports/profit?fromDate=2026-10-12&toDate=2026-10-11", { as: t.owner }));
    expect(res.status).toBe(400);
    const sameDay = await profit.GET(req("GET", "/api/reports/profit?fromDate=2026-10-11&toDate=2026-10-11", { as: t.owner }));
    expect(sameDay.status).toBe(200);
  });
});

describe("F-07 cost of goods sold", () => {
  it("costs only the units sold, first-in-first-out, and reports purchases separately", async () => {
    const t = await makeTenant();
    const buy = (quantity: number, unitCost: number) =>
      purchases.POST(req("POST", "/x", { as: t.managerA, body: { supplierName: "Kiwanja", productId: t.water20, quantity, unitCost } }));
    await buy(20, 10);
    await buy(10, 13);
    await cash.POST(
      req("POST", "/x", {
        as: t.cashierA,
        body: { sales: [{ clientUuid: uuid(), lines: [{ productId: t.water20, quantity: 3 }, { productId: t.water5, quantity: 1 }] }] },
      })
    );
    const { body } = await json(await profit.GET(req("GET", "/api/reports/profit", { as: t.owner })));
    expect(body).toMatchObject({
      revenue: 660, // 3 x 200 + 1 x 60
      unitsSold: 4,
      costOfGoodsSold: 30, // 3 x 10 from the oldest purchase; the 5L was never purchased
      unitsWithoutCost: 1,
      grossProfit: 630,
      stockPurchases: 330,
      cashSurplus: 330,
    });
  });
});

describe("purchase-to-stock backfill", () => {
  it("turns pre-ledger purchases into stock, once", async () => {
    const t = await makeTenant();
    await Purchase.create({
      businessId: t.businessId,
      branchId: t.branchA,
      supplierName: "Old supplier",
      productId: t.water20,
      productLabel: "20L Jerrycan",
      quantity: 20,
      unitCost: 10,
      totalCost: 200,
      recordedBy: t.owner.id,
    });
    expect(await stockOf(t.businessId, t.branchA, t.water20)).toBe(0);
    expect(await backfillPurchaseMovements()).toBe(1);
    expect(await backfillPurchaseMovements()).toBe(0);
    expect(await stockOf(t.businessId, t.branchA, t.water20)).toBe(20);
  });
});

describe("F-04 / F-05 / CAT-12 catalogue", () => {
  it("lists deactivated products for managers and keeps their stock visible", async () => {
    const t = await makeTenant();
    await adjustments.POST(
      req("POST", "/x", { as: t.owner, body: { clientUuid: uuid(), branchId: t.branchA, productId: t.water5, mode: "DELTA", quantity: 7 } })
    );
    await db(() => Product.updateOne({ _id: t.water5 }, { isActive: false }));

    const forManager = await json(await products.GET(req("GET", "/api/products?includeInactive=1", { as: t.managerA })));
    const forCashier = await json(await products.GET(req("GET", "/api/products?includeInactive=1", { as: t.cashierA })));
    expect(forManager.body.products).toHaveLength(2);
    expect(forCashier.body.products).toHaveLength(1);

    const levels = await getStockLevels(t.businessId);
    expect(levels.find((l) => l.productId === t.water5 && l.branchId === t.branchA)).toMatchObject({
      quantity: 7,
      productActive: false,
    });
    expect(levels.some((l) => l.productId === t.water5 && l.branchId === t.branchB)).toBe(false);
  });

  it("stores count units, refuses duplicate names and zero prices", async () => {
    const t = await makeTenant();
    const create = (body: object) => products.POST(req("POST", "/x", { as: t.owner, body }));
    const tray = await json(await create({ label: "Tray of Eggs", sizeLiters: 30, unit: "pcs", unitPrice: 400 }));
    expect(tray.status).toBe(201);
    expect(tray.body.product.unit).toBe("pcs");

    expect((await create({ label: "tray of eggs", sizeLiters: 1, unit: "tray", unitPrice: 400 })).status).toBe(409);
    expect((await create({ label: "Free sample", sizeLiters: 1, unit: "pcs", unitPrice: 0 })).status).toBe(400);
    expect((await create({ label: "Bucket", sizeLiters: 1, unit: "buckets", unitPrice: 50 })).status).toBe(400);

    const rename = await productById.PATCH(
      req("PATCH", "/x", { as: t.owner, body: { label: "20L JERRYCAN" } }),
      params({ id: t.water5 })
    );
    expect(rename.status).toBe(409);
  });
});

describe("STA-04 staff invites", () => {
  async function invite(t: Tenant) {
    const res = await json(
      await users.POST(
        req("POST", "/api/users", {
          as: t.managerA,
          body: { name: "New Cashier", role: "DELIVERY", phoneNumber: "0711222333", email: "new.cashier@aquaflow.test" },
        })
      )
    );
    expect(res.status).toBe(201);
    return { userId: res.body.user._id as string, token: (res.body.inviteUrl as string).split("/invite/")[1] };
  }

  const signIn = (password: string) =>
    login.POST(req("POST", "/x", { body: { email: "new.cashier@aquaflow.test", password, deviceId: uuid() } }));

  it("lets the invited person set their own password, once", async () => {
    const t = await makeTenant();
    const { token } = await invite(t);

    const who = await json(await invites.GET(req("GET", "/x"), params({ token })));
    expect(who.body).toMatchObject({ name: "New Cashier", email: "new.cashier@aquaflow.test" });

    expect((await invites.POST(req("POST", "/x", { body: { password: "short" } }), params({ token }))).status).toBe(400);
    expect((await invites.POST(req("POST", "/x", { body: { password: "my-own-secret" } }), params({ token }))).status).toBe(200);
    expect((await signIn("my-own-secret")).status).toBe(200);

    // The link is single-use.
    expect((await invites.GET(req("GET", "/x"), params({ token }))).status).toBe(404);
  });

  it("issues a fresh link that replaces the old one, and rejects expired links", async () => {
    const t = await makeTenant();
    const { userId, token } = await invite(t);
    const again = await json(await reinvite.POST(req("POST", "/x", { as: t.managerA }), params({ id: userId })));
    expect(again.status).toBe(200);
    const fresh = (again.body.inviteUrl as string).split("/invite/")[1];

    expect((await invites.GET(req("GET", "/x"), params({ token }))).status).toBe(404);
    expect((await invites.GET(req("GET", "/x"), params({ token: fresh }))).status).toBe(200);

    await db(() => User.updateOne({ _id: new mongoose.Types.ObjectId(userId) }, { inviteExpiresAt: new Date(Date.now() - 1000) }));
    expect((await invites.GET(req("GET", "/x"), params({ token: fresh }))).status).toBe(404);
  });

  it("does not let a manager re-invite another branch's staff", async () => {
    const t = await makeTenant();
    await db(() => User.updateOne({ _id: t.cashierB.id }, { inviteExpiresAt: new Date(Date.now() + 60_000) }));
    const res = await reinvite.POST(req("POST", "/x", { as: t.managerA }), params({ id: t.cashierB.id }));
    expect(res.status).toBe(403);
  });
});