import { describe, expect, it } from "vitest";
import {
  provenanceTemplateLanguages,
  whyTemplateLanguages,
  buildWhy,
  type RecommendationCandidate,
  type RecommendationContext,
  type ProvenanceEntry,
} from "../src/index.js";

const EXPECTED_LANGS = [
  "sv",
  "en",
  "es",
  "it",
  "de",
  "fr",
  "da",
  "nb",
  "fi",
  "nl",
  "pl",
  "pt",
];

const fullCoverage = { coverage: 1, matches: [], missing: [], expiringUsed: [] };
const nutrition = {
  kcal: 550,
  proteinG: 45,
  carbsG: 50,
  fatG: 18,
  saturatedFatG: 6,
  fiberG: 6,
  sugarG: 4,
  saltG: 1.5,
};

function candidate(overrides: Partial<RecommendationCandidate> = {}): RecommendationCandidate {
  return {
    recipeId: "r1",
    titleSv: "Kycklinggryta",
    cuisine: "swedish",
    tags: [],
    totalTimeMinutes: 30,
    nutritionPerPortion: nutrition,
    estimatedCostMinorPerPortion: 2200,
    ratingAverage: null,
    ratingCount: 0,
    peakSeasons: [],
    holidayTags: [],
    spiceLevel: 1,
    coverage: fullCoverage,
    ...overrides,
  };
}

const ctx: RecommendationContext = {
  mealType: "dinner",
  persons: 4,
  currentSeason: "summer",
  activeHolidayTags: [],
  isWeekday: true,
  favoriteCuisines: ["swedish"],
  remainingProteinG: 60,
  remainingKcal: 800,
  personalizationEnabled: false,
};

describe("S6 i18n-paritet", () => {
  it("provenansmallarna täcker exakt 12 språk utan dubbletter", () => {
    const langsByTemplate = provenanceTemplateLanguages();
    expect(Object.keys(langsByTemplate).length).toBeGreaterThan(0);
    for (const [key, langs] of Object.entries(langsByTemplate)) {
      expect(langs.length, `mall ${key} har dubbletter eller saknar språk`).toBe(EXPECTED_LANGS.length);
      expect(new Set(langs).size, `mall ${key} har dubbletter`).toBe(EXPECTED_LANGS.length);
      for (const lang of EXPECTED_LANGS) {
        expect(langs).toContain(lang);
      }
    }
  });

  it("why-mallarna täcker exakt 12 språk utan dubbletter", () => {
    const langs = whyTemplateLanguages();
    expect(langs.length).toBe(EXPECTED_LANGS.length);
    expect(new Set(langs).size).toBe(EXPECTED_LANGS.length);
    for (const lang of EXPECTED_LANGS) {
      expect(langs).toContain(lang);
    }
  });

  it("buildWhy renderar på rätt språk för varje supporterat språk", () => {
    const provenance: ProvenanceEntry[] = [
      { key: "favoriteCuisine", args: { cuisine: "svensk" } },
    ];
    for (const lang of EXPECTED_LANGS) {
      const why = buildWhy(candidate(), { ...ctx, personalizationEnabled: true }, { coverage: 1, expiry: 0, nutritionFit: 0.9, taste: 0.5, rating: 0.5, season: 0, holiday: 0, time: 0, budget: 0, variety: 0.5, weather: 0.5, craving: 0.5, memoryFit: 1, tasteFit: 0, cookingAssumptionFit: 0 }, provenance, `${lang}-XX`);
      expect(why.length, `tom why för ${lang}`).toBeGreaterThan(0);
      // Ingen why får falla tillbaka på svenska fallback om språket finns.
      if (lang !== "sv") {
        expect(why).not.toBe("En balanserad rätt som passar er profil.");
      }
    }
  });
});