/**
 * Grid-builder + accuracy-gate coverage for the view-switching verification
 * harness, over a hand-built fixture that deliberately omits one
 * view×language×modality combination so the grid must report an "absent" cell
 * rather than inventing a status. Pure and deterministic — no model, no server.
 */
import { describe, expect, it } from "vitest";
import {
  buildResultGrid,
  evaluateAccuracyGate,
  type GridRow,
} from "./verify-view-switching.ts";

// Hand-built fixture spanning 2 views × 2 languages × 2 modalities with mixed
// pass/fail, deliberately omitting one combination so the grid must report an
// "absent" cell rather than inventing a status.
const ROWS: GridRow[] = [
  { view: "calendar", language: "en", modality: "text", landedOk: true },
  { view: "calendar", language: "en", modality: "voice", landedOk: false },
  { view: "calendar", language: "es", modality: "text", landedOk: true },
  // calendar / es / voice intentionally omitted -> absent
  { view: "wallet", language: "en", modality: "text", landedOk: false },
  { view: "wallet", language: "en", modality: "voice", landedOk: true },
  { view: "wallet", language: "es", modality: "text", landedOk: true },
  { view: "wallet", language: "es", modality: "voice", landedOk: true },
];

describe("buildResultGrid", () => {
  it("cross-tabulates rows into a per-(view, language, modality) grid", () => {
    const result = buildResultGrid(ROWS);

    expect(result.views).toEqual(["calendar", "wallet"]);
    expect(result.languages).toEqual(["en", "es"]);
    expect(result.modalities).toEqual(["text", "voice"]);

    // pass / fail / absent are each represented in the nested grid.
    expect(result.grid.calendar.en.text).toBe("pass");
    expect(result.grid.calendar.en.voice).toBe("fail");
    expect(result.grid.calendar.es.text).toBe("pass");
    expect(result.grid.calendar.es.voice).toBe("absent");
    expect(result.grid.wallet.en.text).toBe("fail");
    expect(result.grid.wallet.en.voice).toBe("pass");
    expect(result.grid.wallet.es.text).toBe("pass");
    expect(result.grid.wallet.es.voice).toBe("pass");
  });

  it("emits one flat cell per (view × language × modality) combination", () => {
    const result = buildResultGrid(ROWS);

    // 2 views × 2 languages × 2 modalities = 8 cells, even with one absent.
    expect(result.cells).toHaveLength(8);

    const cell = (view: string, language: string, modality: string) =>
      result.cells.find(
        (c) =>
          c.view === view && c.language === language && c.modality === modality,
      );

    expect(cell("calendar", "es", "voice")?.status).toBe("absent");
    expect(cell("calendar", "en", "text")?.status).toBe("pass");
    expect(cell("wallet", "en", "text")?.status).toBe("fail");

    // The flat cells and the nested grid agree everywhere.
    for (const c of result.cells) {
      expect(result.grid[c.view][c.language][c.modality]).toBe(c.status);
    }
  });

  it("marks a combination as fail when any covering row fails (fail dominates)", () => {
    const result = buildResultGrid([
      { view: "inbox", language: "en", modality: "text", landedOk: true },
      { view: "inbox", language: "en", modality: "text", landedOk: false },
    ]);

    expect(result.grid.inbox.en.text).toBe("fail");
    expect(result.cells).toHaveLength(1);
  });
});

describe("evaluateAccuracyGate", () => {
  const summary = {
    total: 24,
    landedAccuracy: 0.4,
    directAccuracy: 0.5,
    negativeControlPrecision: 1,
  };

  it("fails when landedAccuracy is below the floor", () => {
    const gate = evaluateAccuracyGate(summary, { minLandedAccuracy: 0.8 });
    expect(gate.pass).toBe(false);
    expect(gate.failures).toHaveLength(1);
    expect(gate.failures[0]).toMatch(
      /landedAccuracy 40\.0% below floor 80\.0%/,
    );
  });

  it("passes when landedAccuracy is exactly at the floor", () => {
    const gate = evaluateAccuracyGate(
      { ...summary, landedAccuracy: 0.8 },
      { minLandedAccuracy: 0.8 },
    );
    expect(gate.pass).toBe(true);
    expect(gate.failures).toEqual([]);
  });

  it("passes when landedAccuracy is above the floor", () => {
    const gate = evaluateAccuracyGate(
      { ...summary, landedAccuracy: 0.95 },
      { minLandedAccuracy: 0.8 },
    );
    expect(gate.pass).toBe(true);
    expect(gate.failures).toEqual([]);
  });

  it("passes with no floors configured (opt-in)", () => {
    const gate = evaluateAccuracyGate(summary, {});
    expect(gate.pass).toBe(true);
    expect(gate.failures).toEqual([]);
  });

  it("gates per-kind direct accuracy and negative-control precision independently", () => {
    const gate = evaluateAccuracyGate(summary, {
      minDirectAccuracy: 0.9,
      minNegativeControlPrecision: 0.9,
    });
    // direct 0.5 < 0.9 fails; negative-control 1.0 >= 0.9 passes.
    expect(gate.pass).toBe(false);
    expect(gate.failures).toHaveLength(1);
    expect(gate.failures[0]).toMatch(
      /directAccuracy 50\.0% below floor 90\.0%/,
    );
  });

  it("collects every failing floor", () => {
    const gate = evaluateAccuracyGate(
      { total: 24, landedAccuracy: 0.4, directAccuracy: 0.3 },
      { minLandedAccuracy: 0.8, minDirectAccuracy: 0.9 },
    );
    expect(gate.pass).toBe(false);
    expect(gate.failures).toHaveLength(2);
  });

  it("flags a gated metric that has no value rather than silently passing", () => {
    const gate = evaluateAccuracyGate(
      { total: 24, landedAccuracy: 0.95 },
      { minDirectAccuracy: 0.9 },
    );
    expect(gate.pass).toBe(false);
    expect(gate.failures[0]).toMatch(/directAccuracy: no value/);
  });
});