import type { SignupInput } from "@batch-cooking/shared";
import { ErrorCode } 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` — generated rather than hardcoded, no test fixture looks like a real person's data. */
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 }),
  };
}

/** Resolves a reference tech step's id by its `reference-seed-data.ts` uid (also its DB `key`) — mirrors `recipe.test.ts`'s own `techStepId` helper. */
async function techStepId(key: string): Promise<number> {
  const techStep = await prisma.techStep.findFirstOrThrow({ where: { key } });
  return techStep.id;
}

/** Same as {@link techStepId}, for a reference `Ingredient`. */
async function ingredientId(key: string): Promise<number> {
  const ingredient = await prisma.ingredient.findFirstOrThrow({ where: { key } });
  return ingredient.id;
}

/** Same as {@link techStepId}, for a reference `Unit`. */
async function unitId(key: string): Promise<number> {
  const unit = await prisma.unit.findFirstOrThrow({ where: { key } });
  return unit.id;
}

/** Same as {@link techStepId}, for a reference `Utensil`. */
async function utensilId(key: string): Promise<number> {
  const utensil = await prisma.utensil.findFirstOrThrow({ where: { key } });
  return utensil.id;
}

describe("Recipe tech-step corrections", () => {
  const app = createApp();

  async function signup(): Promise<{ agent: ReturnType<typeof request.agent>; profileId: number }> {
    const agent = request.agent(app);
    const res = await agent.post("/auth/signup").send(buildSignupPayload());
    return { agent, profileId: res.body.id };
  }

  /** A `PUBLIC` recipe with one step — every viewer can see this, so most tests below don't need to juggle visibility on top of the correction logic itself. */
  async function createPublicRecipeWithStep(
    authorId: number,
    description = "Faire mijoter la sauce.",
  ): Promise<{ recipeId: number; stepId: number }> {
    const recipe = await prisma.recipe.create({
      data: {
        name: "Recette",
        authorId,
        visibility: "PUBLIC",
        portions: 4,
        steps: { create: [{ description, order: 0 }] },
      },
      include: { steps: true },
    });
    const step = recipe.steps[0];
    if (!step) throw new Error("expected the fixture recipe to have one step");
    return { recipeId: recipe.id, stepId: step.id };
  }

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

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

  describe("POST /recipes/:id/steps/:stepId/corrections", () => {
    it("rejects requests without a session cookie with 401 NOT_AUTHENTICATED", async () => {
      const { profileId } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);

      const res = await request(app)
        .post(`/recipes/${recipeId}/steps/${stepId}/corrections`)
        .send({ start: 0, end: 5, correctedTechStepId: await techStepId("simmer") });

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

    it("records a correction adding a missing technique (no previousTechStepId), and applies it immediately to the step's own techSteps", async () => {
      const { agent, profileId } = await signup();
      // "Faire mijoter la sauce." names no technique the classifier itself
      // registers a bare-word anchor for at this exact span in isolation
      // (see services/tech-step-intent-service's training_data.py) — irrelevant here either way,
      // since this test's whole point is the *manual* addition, not
      // whatever the classifier does or doesn't auto-detect for it.
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);
      const simmerId = await techStepId("simmer");

      const res = await agent
        .post(`/recipes/${recipeId}/steps/${stepId}/corrections`)
        .send({ start: 6, end: 13, correctedTechStepId: simmerId });

      expect(res.status).to.equal(201);
      expect(res.body.correction.previousTechStep).to.equal(null);
      expect(res.body.correction.correctedTechStep).to.deep.equal({ id: simmerId, key: "simmer" });
      expect(res.body.correction.start).to.equal(6);
      expect(res.body.correction.end).to.equal(13);
      // The step's real technique sequence reflects the correction right
      // away — not just the permanent audit record above (see
      // `applyManualCorrection`, `recipe-tech-step-correction.service.ts`).
      expect(res.body.techSteps).to.deep.equal([
        {
          techStep: { id: simmerId, key: "simmer" },
          start: 6,
          end: 13,
          source: "manual",
          ingredients: [],
          utensils: [],
        },
      ]);
    });

    it("records a correction relabeling an existing match (both ids set), updating the existing techSteps entry in place", async () => {
      const { agent, profileId } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);
      const simmerId = await techStepId("simmer");
      const boilId = await techStepId("boil");
      // First correction creates the "manual" entry this test then relabels
      // — exercises the UPDATE branch of `applyManualCorrection`, not the
      // INSERT one the previous test already covers.
      await agent
        .post(`/recipes/${recipeId}/steps/${stepId}/corrections`)
        .send({ start: 6, end: 13, correctedTechStepId: simmerId });

      const res = await agent
        .post(`/recipes/${recipeId}/steps/${stepId}/corrections`)
        .send({ start: 6, end: 13, previousTechStepId: simmerId, correctedTechStepId: boilId });

      expect(res.status).to.equal(201);
      expect(res.body.correction.previousTechStep).to.deep.equal({ id: simmerId, key: "simmer" });
      expect(res.body.correction.correctedTechStep).to.deep.equal({ id: boilId, key: "boil" });
      // Still exactly one entry — the relabel updated the existing row
      // rather than adding a second one alongside it.
      expect(res.body.techSteps).to.deep.equal([
        {
          techStep: { id: boilId, key: "boil" },
          start: 6,
          end: 13,
          source: "manual",
          ingredients: [],
          utensils: [],
        },
      ]);
    });

    it("deletes the matching techSteps entry when correctedTechStepId is null (a removal)", async () => {
      const { agent, profileId } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);
      const simmerId = await techStepId("simmer");
      await agent
        .post(`/recipes/${recipeId}/steps/${stepId}/corrections`)
        .send({ start: 6, end: 13, correctedTechStepId: simmerId });

      const res = await agent
        .post(`/recipes/${recipeId}/steps/${stepId}/corrections`)
        .send({ start: 6, end: 13, previousTechStepId: simmerId, correctedTechStepId: null });

      expect(res.status).to.equal(201);
      expect(res.body.correction.correctedTechStep).to.equal(null);
      expect(res.body.techSteps).to.deep.equal([]);
    });

    it("is not restricted to the recipe's author — any viewer who can see it may correct it", async () => {
      const { profileId: authorId } = await signup();
      const { agent: otherAgent } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(authorId);

      const res = await otherAgent
        .post(`/recipes/${recipeId}/steps/${stepId}/corrections`)
        .send({ start: 6, end: 13, correctedTechStepId: await techStepId("simmer") });

      expect(res.status).to.equal(201);
    });

    it("rejects both previousTechStepId and correctedTechStepId absent with 400 VALIDATION_ERROR", async () => {
      const { agent, profileId } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);

      const res = await agent
        .post(`/recipes/${recipeId}/steps/${stepId}/corrections`)
        .send({ start: 0, end: 5 });

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

    it("rejects end <= start with 400 VALIDATION_ERROR", async () => {
      const { agent, profileId } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);

      const res = await agent
        .post(`/recipes/${recipeId}/steps/${stepId}/corrections`)
        .send({ start: 5, end: 5, correctedTechStepId: await techStepId("simmer") });

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

    it("rejects a span past the end of the step's description with 400 INVALID_CORRECTION_SPAN", async () => {
      const { agent, profileId } = await signup();
      const description = "Court.";
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId, description);

      const res = await agent.post(`/recipes/${recipeId}/steps/${stepId}/corrections`).send({
        start: 0,
        end: description.length + 10,
        correctedTechStepId: await techStepId("simmer"),
      });

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

    it("rejects an unknown correctedTechStepId with 404 TECH_STEP_NOT_FOUND", async () => {
      const { agent, profileId } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);

      const res = await agent
        .post(`/recipes/${recipeId}/steps/${stepId}/corrections`)
        .send({ start: 0, end: 5, correctedTechStepId: 999_999 });

      expect(res.status).to.equal(404);
      expect(res.body.code).to.equal(ErrorCode.TECH_STEP_NOT_FOUND);
    });

    it("rejects a step that exists but isn't visible to the viewer with 404 RECIPE_NOT_FOUND", async () => {
      const { profileId: authorId } = await signup();
      const { agent: otherAgent } = await signup();
      const recipe = await prisma.recipe.create({
        data: {
          name: "Secrète",
          authorId,
          portions: 4,
          steps: { create: [{ description: "Faire mijoter la sauce.", order: 0 }] },
        },
        include: { steps: true },
      });
      const step = recipe.steps[0];
      if (!step) throw new Error("expected the fixture recipe to have one step");

      const res = await otherAgent
        .post(`/recipes/${recipe.id}/steps/${step.id}/corrections`)
        .send({ start: 0, end: 5, correctedTechStepId: await techStepId("simmer") });

      expect(res.status).to.equal(404);
      expect(res.body.code).to.equal(ErrorCode.RECIPE_NOT_FOUND);
    });

    it("rejects a stepId that belongs to a different recipe than the URL's :id with 404 STEP_NOT_FOUND", async () => {
      const { agent, profileId } = await signup();
      const { recipeId: otherRecipeId } = await createPublicRecipeWithStep(profileId);
      const { stepId } = await createPublicRecipeWithStep(profileId);

      const res = await agent
        .post(`/recipes/${otherRecipeId}/steps/${stepId}/corrections`)
        .send({ start: 0, end: 5, correctedTechStepId: await techStepId("simmer") });

      expect(res.status).to.equal(404);
      expect(res.body.code).to.equal(ErrorCode.STEP_NOT_FOUND);
    });
  });

  describe("POST /recipes/:id/steps/:stepId/corrections — ingredients/utensils metadata", () => {
    it("attaches manually-selected ingredients and utensils to a corrected technique", async () => {
      const { agent, profileId } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);
      const simmerId = await techStepId("simmer");
      const butterId = await ingredientId("butter");
      const gramId = await unitId("gram");
      const panId = await utensilId("pan");

      const res = await agent.post(`/recipes/${recipeId}/steps/${stepId}/corrections`).send({
        start: 6,
        end: 13,
        correctedTechStepId: simmerId,
        ingredients: [{ ingredientId: butterId, quantity: 50, unitId: gramId, start: 0, end: 6 }],
        utensils: [{ utensilId: panId, start: 14, end: 23 }],
      });

      expect(res.status).to.equal(201);
      expect(res.body.techSteps).to.deep.equal([
        {
          techStep: { id: simmerId, key: "simmer" },
          start: 6,
          end: 13,
          source: "manual",
          ingredients: [
            {
              ingredient: res.body.techSteps[0].ingredients[0].ingredient,
              quantity: 50,
              unit: res.body.techSteps[0].ingredients[0].unit,
              start: 0,
              end: 6,
              source: "manual",
            },
          ],
          utensils: [
            {
              utensil: res.body.techSteps[0].utensils[0].utensil,
              start: 14,
              end: 23,
              source: "manual",
            },
          ],
        },
      ]);
      expect(res.body.techSteps[0].ingredients[0].ingredient.id).to.equal(butterId);
      expect(res.body.techSteps[0].ingredients[0].unit.id).to.equal(gramId);
      expect(res.body.techSteps[0].utensils[0].utensil).to.deep.equal({ id: panId, key: "pan" });
    });

    it("attaches an ingredient with no quantity/unit (both omitted)", async () => {
      const { agent, profileId } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);
      const simmerId = await techStepId("simmer");
      const butterId = await ingredientId("butter");

      const res = await agent.post(`/recipes/${recipeId}/steps/${stepId}/corrections`).send({
        start: 6,
        end: 13,
        correctedTechStepId: simmerId,
        ingredients: [{ ingredientId: butterId, start: 0, end: 6 }],
      });

      expect(res.status).to.equal(201);
      expect(res.body.techSteps[0].ingredients[0].quantity).to.equal(null);
      expect(res.body.techSteps[0].ingredients[0].unit).to.equal(null);
    });

    it("replaces both auto-detected and previously-manual metadata on the same occurrence — never accumulates", async () => {
      const { agent, profileId } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);
      const simmerId = await techStepId("simmer");
      const boilId = await techStepId("boil");
      const butterId = await ingredientId("butter");
      const carrotId = await ingredientId("carrot");
      const panId = await utensilId("pan");
      const saucepanId = await utensilId("saucepan");

      // First correction creates the occurrence (order 0) — simulate an
      // auto-detected ingredient already sitting on it, exactly as
      // tech-step-matcher.ts would have written one at save time (bypassed
      // here for a deterministic fixture, not dependent on the real
      // classifier's own output for this text).
      await agent
        .post(`/recipes/${recipeId}/steps/${stepId}/corrections`)
        .send({ start: 6, end: 13, correctedTechStepId: simmerId });
      await prisma.stepTechStepIngredient.create({
        data: {
          stepId,
          techStepOrder: 0,
          ingredientId: butterId,
          start: 0,
          end: 6,
          source: "auto",
        },
      });
      await prisma.stepTechStepUtensil.create({
        data: { stepId, techStepOrder: 0, utensilId: panId, start: 14, end: 23, source: "auto" },
      });

      // Second correction — relabels the technique *and* submits a whole
      // new, disjoint metadata set.
      const res = await agent.post(`/recipes/${recipeId}/steps/${stepId}/corrections`).send({
        start: 6,
        end: 13,
        previousTechStepId: simmerId,
        correctedTechStepId: boilId,
        ingredients: [{ ingredientId: carrotId, start: 0, end: 6 }],
        utensils: [{ utensilId: saucepanId, start: 14, end: 23 }],
      });

      expect(res.status).to.equal(201);
      expect(res.body.techSteps).to.have.length(1);
      // Neither the auto-detected butter/pan nor an empty leftover row
      // survive — only the freshly-submitted carrot/saucepan.
      expect(
        res.body.techSteps[0].ingredients.map(
          (i: { ingredient: { id: number } }) => i.ingredient.id,
        ),
      ).to.deep.equal([carrotId]);
      expect(
        res.body.techSteps[0].utensils.map((u: { utensil: { id: number } }) => u.utensil.id),
      ).to.deep.equal([saucepanId]);
    });

    it("leaves existing metadata untouched when ingredients/utensils are omitted from the request", async () => {
      const { agent, profileId } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);
      const simmerId = await techStepId("simmer");
      const boilId = await techStepId("boil");
      const butterId = await ingredientId("butter");

      await agent.post(`/recipes/${recipeId}/steps/${stepId}/corrections`).send({
        start: 6,
        end: 13,
        correctedTechStepId: simmerId,
        ingredients: [{ ingredientId: butterId, start: 0, end: 6 }],
      });

      // Relabels the technique again, but says nothing about metadata at all.
      const res = await agent.post(`/recipes/${recipeId}/steps/${stepId}/corrections`).send({
        start: 6,
        end: 13,
        previousTechStepId: simmerId,
        correctedTechStepId: boilId,
      });

      expect(res.status).to.equal(201);
      expect(res.body.techSteps[0].ingredients).to.have.length(1);
      expect(res.body.techSteps[0].ingredients[0].ingredient.id).to.equal(butterId);
    });

    it("rejects metadata submitted alongside correctedTechStepId: null with 400 VALIDATION_ERROR", async () => {
      const { agent, profileId } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);
      const simmerId = await techStepId("simmer");
      const butterId = await ingredientId("butter");
      await agent
        .post(`/recipes/${recipeId}/steps/${stepId}/corrections`)
        .send({ start: 6, end: 13, correctedTechStepId: simmerId });

      const res = await agent.post(`/recipes/${recipeId}/steps/${stepId}/corrections`).send({
        start: 6,
        end: 13,
        previousTechStepId: simmerId,
        correctedTechStepId: null,
        ingredients: [{ ingredientId: butterId, start: 0, end: 6 }],
      });

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

    it("rejects an unknown ingredientId with 404 INGREDIENT_NOT_FOUND", async () => {
      const { agent, profileId } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);

      const res = await agent.post(`/recipes/${recipeId}/steps/${stepId}/corrections`).send({
        start: 6,
        end: 13,
        correctedTechStepId: await techStepId("simmer"),
        ingredients: [{ ingredientId: 999_999, start: 0, end: 6 }],
      });

      expect(res.status).to.equal(404);
      expect(res.body.code).to.equal(ErrorCode.INGREDIENT_NOT_FOUND);
    });

    it("rejects an unknown unitId with 404 UNIT_NOT_FOUND", async () => {
      const { agent, profileId } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);

      const res = await agent.post(`/recipes/${recipeId}/steps/${stepId}/corrections`).send({
        start: 6,
        end: 13,
        correctedTechStepId: await techStepId("simmer"),
        ingredients: [
          { ingredientId: await ingredientId("butter"), unitId: 999_999, start: 0, end: 6 },
        ],
      });

      expect(res.status).to.equal(404);
      expect(res.body.code).to.equal(ErrorCode.UNIT_NOT_FOUND);
    });

    it("rejects an unknown utensilId with 404 UTENSIL_NOT_FOUND", async () => {
      const { agent, profileId } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);

      const res = await agent.post(`/recipes/${recipeId}/steps/${stepId}/corrections`).send({
        start: 6,
        end: 13,
        correctedTechStepId: await techStepId("simmer"),
        utensils: [{ utensilId: 999_999, start: 0, end: 6 }],
      });

      expect(res.status).to.equal(404);
      expect(res.body.code).to.equal(ErrorCode.UTENSIL_NOT_FOUND);
    });

    it("rejects a metadata span past the end of the step's description with 400 INVALID_CORRECTION_SPAN", async () => {
      const { agent, profileId } = await signup();
      const description = "Court.";
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId, description);

      const res = await agent.post(`/recipes/${recipeId}/steps/${stepId}/corrections`).send({
        start: 0,
        end: description.length,
        correctedTechStepId: await techStepId("simmer"),
        ingredients: [
          { ingredientId: await ingredientId("butter"), start: 0, end: description.length + 10 },
        ],
      });

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

  describe("GET /recipes/:id/steps/:stepId/corrections", () => {
    it("returns every correction submitted for the step, most recent first", async () => {
      const { agent, profileId } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);
      const simmerId = await techStepId("simmer");
      const boilId = await techStepId("boil");

      await agent
        .post(`/recipes/${recipeId}/steps/${stepId}/corrections`)
        .send({ start: 6, end: 13, correctedTechStepId: simmerId });
      await agent
        .post(`/recipes/${recipeId}/steps/${stepId}/corrections`)
        .send({ start: 6, end: 13, previousTechStepId: simmerId, correctedTechStepId: boilId });

      const res = await agent.get(`/recipes/${recipeId}/steps/${stepId}/corrections`);

      expect(res.status).to.equal(200);
      expect(res.body).to.have.length(2);
      expect(res.body[0].correctedTechStep).to.deep.equal({ id: boilId, key: "boil" });
      expect(res.body[1].correctedTechStep).to.deep.equal({ id: simmerId, key: "simmer" });
    });

    it("returns an empty list when nothing has been submitted yet", async () => {
      const { agent, profileId } = await signup();
      const { recipeId, stepId } = await createPublicRecipeWithStep(profileId);

      const res = await agent.get(`/recipes/${recipeId}/steps/${stepId}/corrections`);

      expect(res.status).to.equal(200);
      expect(res.body).to.deep.equal([]);
    });
  });
});