import { expect } from "chai";
import { prisma } from "../../src/db/prisma.js";
import type {
  IngredientMatchEntry,
  UnitMatchEntry,
} from "../../src/lib/recipe-matching/ingredient-matcher.js";
import {
  mergeDuplicateIngredients,
  type TranslatedRecipeIngredient,
  translateRecipe,
  translateRecipeIngredients,
  translateRecipeSteps,
  type UnitConversionEntry,
} from "../../src/lib/recipe-matching/recipe-translation.js";
import type { TechStepMappingRule } from "../../src/lib/recipe-matching/tech-step-matcher.js";
import type {
  ParsedRecipe,
  ParsedRecipeIngredient,
} from "../../src/lib/recipe-sources/recipe-source-adapter.js";
import { resetDatabase } from "../../test-support/reset-db.js";

/** A minimal fixture `ParsedRecipe` — only `steps` (built from `descriptions`) matters for most tests here, the rest is filler to prove it survives translation untouched. */
function buildParsedRecipe(descriptions: string[]): ParsedRecipe {
  return {
    name: "Test Recipe",
    description: "A recipe for testing",
    picture: "https://example.test/recipe.jpg",
    portions: 4,
    sourceUrl: "https://example.test/recipes/1",
    ingredients: [{ rawText: "1 egg", quantity: null, unit: null, name: "egg" }],
    steps: descriptions.map((description, i) => ({
      description,
      picture: i === 0 ? "https://example.test/step1.jpg" : null,
    })),
  };
}

describe("recipe-translation", () => {
  describe("translateRecipeSteps", () => {
    const simmer: TechStepMappingRule = {
      techStepId: 1,
      expression: "\\bmijot(er|ez|e|ant|é)\\b",
      weight: 15,
    };
    const preheat: TechStepMappingRule = {
      techStepId: 2,
      expression: "\\bpr[ée]chauff(er|ez|é|ée)\\b",
      weight: 20,
    };
    const melt: TechStepMappingRule = {
      techStepId: 3,
      expression: "\\bfaire fondre\\b|\\bfaites fondre\\b",
      weight: 15,
    };

    it("declares each step's technique sequence, preserving order", () => {
      const recipe = buildParsedRecipe([
        "Préchauffer la poêle, puis faire fondre le beurre",
        "Servir immédiatement",
        "Faire mijoter à feu doux",
      ]);

      const translated = translateRecipeSteps(recipe, [simmer, preheat, melt]);

      expect(translated.steps.map((step) => step.techStepIds)).to.deep.equal([[2, 3], [], [1]]);
    });

    it("leaves description/picture untouched on each step", () => {
      const recipe = buildParsedRecipe(["Faire mijoter à feu doux", "Servir"]);

      const translated = translateRecipeSteps(recipe, [simmer]);

      expect(translated.steps[0]).to.deep.equal({
        description: "Faire mijoter à feu doux",
        picture: "https://example.test/step1.jpg",
        techStepIds: [1],
      });
      expect(translated.steps[1]).to.deep.equal({
        description: "Servir",
        picture: null,
        techStepIds: [],
      });
    });

    it("passes every other field through unchanged", () => {
      const recipe = buildParsedRecipe(["Servir"]);

      const translated = translateRecipeSteps(recipe, []);

      expect(translated.name).to.equal(recipe.name);
      expect(translated.description).to.equal(recipe.description);
      expect(translated.picture).to.equal(recipe.picture);
      expect(translated.portions).to.equal(recipe.portions);
      expect(translated.sourceUrl).to.equal(recipe.sourceUrl);
    });

    it("stubs every ingredient's ingredientId/unitId to null, leaving the rest of it untouched — actual ingredient matching is translateRecipeIngredients' job", () => {
      const recipe = buildParsedRecipe(["Servir"]);

      const translated = translateRecipeSteps(recipe, []);

      expect(translated.ingredients).to.deep.equal([
        { ...recipe.ingredients[0], ingredientId: null, unitId: null },
      ]);
    });

    it("gives every step an empty sequence when there are no mappings at all", () => {
      const recipe = buildParsedRecipe(["Faire mijoter à feu doux", "Préchauffer le four"]);

      const translated = translateRecipeSteps(recipe, []);

      expect(translated.steps.map((step) => step.techStepIds)).to.deep.equal([[], []]);
    });

    it("handles a recipe with no steps without error", () => {
      const recipe = buildParsedRecipe([]);

      const translated = translateRecipeSteps(recipe, [simmer]);

      expect(translated.steps).to.deep.equal([]);
    });
  });

  describe("translateRecipeIngredients", () => {
    const tomato: IngredientMatchEntry = { ingredientId: 1, label: "Tomato" };
    const chicken: IngredientMatchEntry = { ingredientId: 2, label: "Chicken" };
    const chickenBreast: IngredientMatchEntry = { ingredientId: 3, label: "Chicken breast" };
    const onion: IngredientMatchEntry = { ingredientId: 4, label: "Onion" };

    const gram: UnitMatchEntry = { unitId: 10, synonyms: ["g", "gram", "grams"] };
    const cup: UnitMatchEntry = { unitId: 11, synonyms: ["cup", "cups"] };

    function buildIngredient(
      overrides: Partial<ParsedRecipeIngredient> & { rawText: string; name: string },
    ): ParsedRecipeIngredient {
      return { quantity: null, unit: null, ...overrides };
    }

    it("resolves ingredientId from free-text name, tolerating extra descriptive words and plurals", () => {
      const translated = translateRecipeIngredients(
        [
          buildIngredient({
            rawText: "2 large diced yellow onions",
            name: "large diced yellow onions",
          }),
        ],
        [tomato, chicken, chickenBreast, onion],
        [],
      );

      expect(translated[0].ingredientId).to.equal(onion.ingredientId);
    });

    it("prefers the more specific multi-word label over a shorter one it contains", () => {
      const translated = translateRecipeIngredients(
        [
          buildIngredient({
            rawText: "2 boneless chicken breasts",
            name: "boneless chicken breasts",
          }),
        ],
        [tomato, chicken, chickenBreast, onion],
        [],
      );

      expect(translated[0].ingredientId).to.equal(chickenBreast.ingredientId);
    });

    it("returns a null ingredientId when nothing in the catalog matches", () => {
      const translated = translateRecipeIngredients(
        [buildIngredient({ rawText: "1 mango", name: "mango" })],
        [tomato, chicken, chickenBreast, onion],
        [],
      );

      expect(translated[0].ingredientId).to.equal(null);
    });

    it("extracts a mixed-number quantity and unit from rawText when the source left them null", () => {
      const translated = translateRecipeIngredients(
        [buildIngredient({ rawText: "1 1/2 cups chicken breast", name: "chicken breast" })],
        [chickenBreast],
        [cup],
      );

      expect(translated[0].quantity).to.equal(1.5);
      expect(translated[0].unitId).to.equal(cup.unitId);
    });

    it("trusts the source's own quantity/unit over re-deriving them from rawText", () => {
      const translated = translateRecipeIngredients(
        [
          buildIngredient({
            rawText: "some raw text that happens to mention cups",
            name: "tomato",
            quantity: 3,
            unit: "g",
          }),
        ],
        [tomato],
        [gram, cup],
      );

      expect(translated[0].quantity).to.equal(3);
      expect(translated[0].unitId).to.equal(gram.unitId);
    });

    it("falls back to the generic 'piece' unit when a quantity was found but no unit word was (issue #53)", () => {
      const piece: UnitMatchEntry = { unitId: 12, synonyms: ["piece", "pieces", "pc", "pcs"] };

      const translated = translateRecipeIngredients(
        [buildIngredient({ rawText: "4 Egg Yolks", name: "Egg Yolks" })],
        [],
        [gram, cup, piece],
      );

      expect(translated[0].quantity).to.equal(4);
      expect(translated[0].unitId).to.equal(piece.unitId);
    });

    it("does not fall back to 'piece' when there's no quantity at all to count", () => {
      const piece: UnitMatchEntry = { unitId: 12, synonyms: ["piece", "pieces", "pc", "pcs"] };

      const translated = translateRecipeIngredients(
        [buildIngredient({ rawText: "salt to taste", name: "salt" })],
        [],
        [piece],
      );

      expect(translated[0].quantity).to.equal(null);
      expect(translated[0].unitId).to.equal(null);
    });

    it("leaves quantity/unitId null when rawText has neither a leading number nor a recognizable unit", () => {
      const translated = translateRecipeIngredients(
        [buildIngredient({ rawText: "salt to taste", name: "salt" })],
        [],
        [],
      );

      expect(translated[0].quantity).to.equal(null);
      expect(translated[0].unitId).to.equal(null);
    });

    it("leaves rawText/name/description untouched", () => {
      const ingredient = buildIngredient({ rawText: "1 cup onions", name: "onions" });

      const translated = translateRecipeIngredients([ingredient], [onion], [cup]);

      expect(translated[0].rawText).to.equal(ingredient.rawText);
      expect(translated[0].name).to.equal(ingredient.name);
    });
  });

  describe("mergeDuplicateIngredients", () => {
    const gram: UnitConversionEntry = { id: 1, type: "MASS", toBaseFactor: 1 };
    const kilogram: UnitConversionEntry = { id: 2, type: "MASS", toBaseFactor: 1000 };
    const milliliter: UnitConversionEntry = { id: 3, type: "VOLUME", toBaseFactor: 1 };
    const piece: UnitConversionEntry = { id: 4, type: "COUNT", toBaseFactor: 1 };
    const slice: UnitConversionEntry = { id: 5, type: "COUNT", toBaseFactor: 1 };

    function buildLine(
      overrides: Partial<TranslatedRecipeIngredient> & { rawText: string },
    ): TranslatedRecipeIngredient {
      return {
        name: overrides.rawText,
        quantity: null,
        unit: null,
        ingredientId: null,
        unitId: null,
        ...overrides,
      };
    }

    it("sums the quantity of two lines resolving to the same ingredient, same unit (issue #53 follow-up)", () => {
      const merged = mergeDuplicateIngredients(
        [
          buildLine({ rawText: "100g Sugar", ingredientId: 1, quantity: 100, unitId: gram.id }),
          buildLine({ rawText: "45g Sugar", ingredientId: 1, quantity: 45, unitId: gram.id }),
        ],
        [gram, kilogram, milliliter, piece, slice],
      );

      expect(merged).to.have.length(1);
      expect(merged[0].quantity).to.equal(145);
      expect(merged[0].unitId).to.equal(gram.id);
      expect(merged[0].rawText).to.equal("100g Sugar + 45g Sugar");
    });

    it("converts through toBaseFactor when the duplicate uses a different unit of the same type", () => {
      const merged = mergeDuplicateIngredients(
        [
          buildLine({ rawText: "500g Flour", ingredientId: 1, quantity: 500, unitId: gram.id }),
          buildLine({
            rawText: "0.5kg Flour",
            ingredientId: 1,
            quantity: 0.5,
            unitId: kilogram.id,
          }),
        ],
        [gram, kilogram, milliliter, piece, slice],
      );

      expect(merged).to.have.length(1);
      expect(merged[0].quantity).to.equal(1000);
      expect(merged[0].unitId).to.equal(gram.id);
    });

    it("keeps duplicate COUNT-unit lines separate rather than guessing — a slice isn't a piece", () => {
      const merged = mergeDuplicateIngredients(
        [
          buildLine({ rawText: "2 piece Bread", ingredientId: 1, quantity: 2, unitId: piece.id }),
          buildLine({ rawText: "3 slice Bread", ingredientId: 1, quantity: 3, unitId: slice.id }),
        ],
        [gram, kilogram, milliliter, piece, slice],
      );

      expect(merged).to.have.length(2);
    });

    it("keeps duplicate lines with incompatible unit types separate (MASS vs VOLUME)", () => {
      const merged = mergeDuplicateIngredients(
        [
          buildLine({ rawText: "200g Milk", ingredientId: 1, quantity: 200, unitId: gram.id }),
          buildLine({
            rawText: "200ml Milk",
            ingredientId: 1,
            quantity: 200,
            unitId: milliliter.id,
          }),
        ],
        [gram, kilogram, milliliter, piece, slice],
      );

      expect(merged).to.have.length(2);
    });

    it("never merges two unresolved lines (ingredientId: null) together", () => {
      const merged = mergeDuplicateIngredients(
        [
          buildLine({ rawText: "1 vanilla pod", quantity: 1 }),
          buildLine({ rawText: "1 vanilla pod", quantity: 1 }),
        ],
        [gram, kilogram, milliliter, piece, slice],
      );

      expect(merged).to.have.length(2);
    });

    it("leaves non-duplicate lines untouched and preserves order", () => {
      const sugar = buildLine({ rawText: "Sugar", ingredientId: 1, quantity: 1, unitId: gram.id });
      const salt = buildLine({ rawText: "Salt", ingredientId: 2, quantity: 1, unitId: gram.id });

      const merged = mergeDuplicateIngredients([sugar, salt], [gram, kilogram, milliliter]);

      expect(merged).to.deep.equal([sugar, salt]);
    });
  });

  describe("translateRecipe", () => {
    beforeEach(async () => {
      await resetDatabase();
    });

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

    it("resolves real TechStep ids from the seeded French catalog", async () => {
      const simmer = await prisma.techStep.findFirstOrThrow({ where: { key: "simmer" } });
      const chop = await prisma.techStep.findFirstOrThrow({ where: { key: "chop" } });
      const recipe = buildParsedRecipe(["Hacher les oignons", "Faire mijoter à feu doux"]);

      const translated = await translateRecipe(recipe, "fr");

      expect(translated.steps.map((step) => step.techStepIds)).to.deep.equal([
        [chop.id],
        [simmer.id],
      ]);
    });

    it("finds nothing for English text against the French catalog — locales are separate rule sets, never mixed", async () => {
      // A step lifted verbatim from a real TheMealDB recipe.
      const recipe = buildParsedRecipe([
        "Bring a large saucepan of salted water to the boil",
        "Chop the onions finely",
      ]);

      const translated = await translateRecipe(recipe, "fr");

      expect(translated.steps.map((step) => step.techStepIds)).to.deep.equal([[], []]);
    });

    it("resolves real TechStep ids from the seeded English catalog", async () => {
      const boil = await prisma.techStep.findFirstOrThrow({ where: { key: "boil" } });
      const chop = await prisma.techStep.findFirstOrThrow({ where: { key: "chop" } });
      // Same two steps as the French/English mismatch test above, this
      // time matched against the matching-language catalog.
      const recipe = buildParsedRecipe([
        "Bring a large saucepan of salted water to the boil",
        "Chop the onions finely",
      ]);

      const translated = await translateRecipe(recipe, "en");

      expect(translated.steps.map((step) => step.techStepIds)).to.deep.equal([
        [boil.id],
        [chop.id],
      ]);
    });

    it("finds nothing for a locale with no mappings at all", async () => {
      const recipe = buildParsedRecipe(["Faire mijoter à feu doux"]);

      const translated = await translateRecipe(recipe, "de");

      expect(translated.steps.map((step) => step.techStepIds)).to.deep.equal([[]]);
    });

    it("resolves real Ingredient/Unit ids from the seeded English catalog for an 'en' translation", async () => {
      const onion = await prisma.ingredient.findFirstOrThrow({ where: { key: "onion" } });
      const cup = await prisma.unit.findFirstOrThrow({ where: { key: "cup" } });
      const recipe: ParsedRecipe = {
        ...buildParsedRecipe(["Chop the onions finely"]),
        ingredients: [
          { rawText: "1 cup onions, chopped", quantity: null, unit: null, name: "onions" },
        ],
      };

      const translated = await translateRecipe(recipe, "en");

      expect(translated.ingredients).to.deep.equal([
        {
          rawText: "1 cup onions, chopped",
          quantity: 1,
          unit: null,
          name: "onions",
          ingredientId: onion.id,
          unitId: cup.id,
        },
      ]);
    });

    it("leaves ingredients untouched (no quantity extraction either) for a non-English locale — no matching data exists yet, and the DB isn't even queried for it", async () => {
      const recipe: ParsedRecipe = {
        ...buildParsedRecipe(["Faire mijoter à feu doux"]),
        ingredients: [
          { rawText: "1 cup onions, chopped", quantity: null, unit: null, name: "onions" },
        ],
      };

      const translated = await translateRecipe(recipe, "fr");

      expect(translated.ingredients).to.deep.equal([
        {
          rawText: "1 cup onions, chopped",
          quantity: null,
          unit: null,
          name: "onions",
          ingredientId: null,
          unitId: null,
        },
      ]);
    });
  });
});