import { assertEquals } from "@std/assert";
import {
  calculateWeightedAverage,
  getEffectiveNote,
  applyAjustement,
  Note,
  UEModule,
  Ajustement
} from "../../logic/grades.ts";

Deno.test("grades logic: getEffectiveNote uses session 2 if present", () => {
  const note: Note = { note: 12, noteSession2: 15 };
  assertEquals(getEffectiveNote(note), 15);
});

Deno.test("grades logic: getEffectiveNote uses session 1 if session 2 is null", () => {
  const note: Note = { note: 12, noteSession2: null };
  assertEquals(getEffectiveNote(note), 12);
});

Deno.test("grades logic: calculateWeightedAverage computes correctly", () => {
  const ueModules: UEModule[] = [
    { idModule: "M1", coeff: 2 },
    { idModule: "M2", coeff: 3 },
  ];
  const notesMap: Record<string, Note> = {
    "M1": { note: 10, noteSession2: null },
    "M2": { note: 15, noteSession2: null },
  };
  // (10*2 + 15*3) / 5 = (20 + 45) / 5 = 65 / 5 = 13
  assertEquals(calculateWeightedAverage(ueModules, notesMap), 13);
});

Deno.test("grades logic: calculateWeightedAverage handles missing notes", () => {
  const ueModules: UEModule[] = [
    { idModule: "M1", coeff: 2 },
    { idModule: "M2", coeff: 3 },
  ];
  const notesMap: Record<string, Note> = {
    "M1": { note: 10, noteSession2: null },
    // M2 manquante
  };
  // (10*2) / 2 = 10
  assertEquals(calculateWeightedAverage(ueModules, notesMap), 10);
});

Deno.test("grades logic: calculateWeightedAverage returns null if no notes", () => {
  const ueModules: UEModule[] = [
    { idModule: "M1", coeff: 2 },
  ];
  const notesMap: Record<string, Note> = {};
  assertEquals(calculateWeightedAverage(ueModules, notesMap), null);
});

Deno.test("grades logic: applyAjustement replaces calculated average", () => {
  const calculatedAvg = 12;
  const ajustement: Ajustement = { valeur: 14, malus: 0 };
  assertEquals(applyAjustement(calculatedAvg, ajustement), 14);
});

Deno.test("grades logic: applyAjustement subtracts malus", () => {
  const calculatedAvg = 12;
  const ajustement: Ajustement = { valeur: 14, malus: 2 };
  assertEquals(applyAjustement(calculatedAvg, ajustement), 12);
});

Deno.test("grades logic: applyAjustement returns calculated average if no ajustement", () => {
  const calculatedAvg = 12;
  assertEquals(applyAjustement(calculatedAvg, null), 12);
});