import { DateTime } from "@batch-cooking/date-tools";
import { ErrorCode, type SignupInput } from "@batch-cooking/shared";
import { faker } from "@faker-js/faker";
import { expect } from "chai";
import request from "supertest";
import { createApp } from "../src/app.js";
import { prisma } from "../src/db/prisma.js";
import { resetDatabase } from "../test-support/reset-db.js";

/** See `auth.test.ts` — same rationale for generating rather than hardcoding. */
function buildSignupPayload(): SignupInput {
  const firstName = faker.person.firstName();
  const lastName = faker.person.lastName();
  return {
    firstName,
    lastName,
    email: faker.internet.email({ firstName, lastName }).toLowerCase(),
    password: faker.internet.password({ length: 16 }),
  };
}

/** Today, as the `YYYY-MM-DD` string `GET /planning`'s `?date=` expects. */
function today(): string {
  return isoDate(DateTime.utc());
}

/** `toISODate()` only returns `null` for an invalid `DateTime` — never the case for the always-valid values built in this file. */
function isoDate(date: DateTime): string {
  const iso = date.toISODate();
  if (iso === null) throw new Error("Unexpectedly invalid DateTime in a test helper");
  return iso;
}

describe("Planning", () => {
  const app = createApp();

  beforeEach(async () => {
    await resetDatabase();
  });

  after(async () => {
    await prisma.$disconnect();
  });

  describe("GET /planning", () => {
    it("rejects requests without a session cookie with 401 NOT_AUTHENTICATED", async () => {
      const res = await request(app).get("/planning").query({ date: today() });

      expect(res.status).to.equal(401);
      expect(res.body.code).to.equal(ErrorCode.NOT_AUTHENTICATED);
    });

    it("rejects a missing date with 400 VALIDATION_ERROR", async () => {
      const agent = request.agent(app);
      await agent.post("/auth/signup").send(buildSignupPayload());

      const res = await agent.get("/planning");

      expect(res.status).to.equal(400);
      expect(res.body.code).to.equal(ErrorCode.VALIDATION_ERROR);
    });

    it("rejects a malformed date with 400 VALIDATION_ERROR", async () => {
      const agent = request.agent(app);
      await agent.post("/auth/signup").send(buildSignupPayload());

      const res = await agent.get("/planning").query({ date: "not-a-date" });

      expect(res.status).to.equal(400);
      expect(res.body.code).to.equal(ErrorCode.VALIDATION_ERROR);
    });

    it("rejects a date shaped right but calendarially impossible with 400 VALIDATION_ERROR", async () => {
      const agent = request.agent(app);
      await agent.post("/auth/signup").send(buildSignupPayload());

      const res = await agent.get("/planning").query({ date: "2026-02-30" });

      expect(res.status).to.equal(400);
      expect(res.body.code).to.equal(ErrorCode.VALIDATION_ERROR);
    });

    it("returns null when the household has no planning covering that date", async () => {
      const agent = request.agent(app);
      await agent.post("/auth/signup").send(buildSignupPayload());

      const res = await agent.get("/planning").query({ date: today() });

      expect(res.status).to.equal(200);
      expect(res.body).to.equal(null);
    });

    it("returns the household's planning covering that date, with recipes resolved", async () => {
      const agent = request.agent(app);
      await agent.post("/auth/signup").send(buildSignupPayload());
      const houseRes = await agent.post("/house").send({ name: "Chez moi" });
      const houseId: number = houseRes.body.id;

      const recipe = await prisma.recipe.create({ data: { name: "Ratatouille" } });
      const now = new Date();
      const planning = await prisma.planning.create({
        data: {
          houseId,
          startDate: new Date(
            Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate() - 2),
          ),
          finishDate: new Date(
            Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate() + 2),
          ),
        },
      });
      await prisma.planningItem.create({
        data: { planningId: planning.id, weekDay: "lundi", meal: "diner", recipeId: recipe.id },
      });

      const res = await agent.get("/planning").query({ date: today() });

      expect(res.status).to.equal(200);
      expect(res.body.id).to.equal(planning.id);
      expect(res.body.items).to.have.length(1);
      expect(res.body.items[0]).to.include({ weekDay: "lundi", meal: "diner" });
      expect(res.body.items[0].recipe).to.include({ id: recipe.id, name: "Ratatouille" });
    });

    it("returns null when the household's planning does not cover that date", async () => {
      const agent = request.agent(app);
      await agent.post("/auth/signup").send(buildSignupPayload());
      const houseRes = await agent.post("/house").send({ name: "Chez moi" });
      const houseId: number = houseRes.body.id;

      // A planning entirely in the past — shouldn't be picked up for today.
      await prisma.planning.create({
        data: {
          houseId,
          startDate: new Date(Date.UTC(2000, 0, 1)),
          finishDate: new Date(Date.UTC(2000, 0, 7)),
        },
      });

      const res = await agent.get("/planning").query({ date: today() });

      expect(res.status).to.equal(200);
      expect(res.body).to.equal(null);
    });

    it("returns a different week's planning when asked for a date outside the current one", async () => {
      const agent = request.agent(app);
      await agent.post("/auth/signup").send(buildSignupPayload());
      const houseRes = await agent.post("/house").send({ name: "Chez moi" });
      const houseId: number = houseRes.body.id;

      const recipe = await prisma.recipe.create({ data: { name: "Curry de lentilles" } });
      const nextWeek = DateTime.utc().plus({ weeks: 1 });
      const planning = await prisma.planning.create({
        data: {
          houseId,
          startDate: nextWeek.startOf("week").toJSDate(),
          finishDate: nextWeek.endOf("week").startOf("day").toJSDate(),
        },
      });
      await prisma.planningItem.create({
        data: { planningId: planning.id, weekDay: "mardi", meal: "dejeuner", recipeId: recipe.id },
      });

      const res = await agent.get("/planning").query({ date: isoDate(nextWeek) });

      expect(res.status).to.equal(200);
      expect(res.body.id).to.equal(planning.id);

      const thisWeekRes = await agent.get("/planning").query({ date: today() });
      expect(thisWeekRes.body).to.equal(null);
    });
  });
});