import { describe, expect, it } from "vitest";
import { discoverySignificance, eventFingerprint, eventTitle, significanceFor, TRACKED_FACILITY_FIELDS } from "./events.js";

const spec = (field: string) => TRACKED_FACILITY_FIELDS.find((s) => s.field === field)!;

describe("event fingerprint", () => {
  it("is stable for the same entity/type/value/day and differs otherwise", () => {
    const a = eventFingerprint("facility", "fac_1", "capacity_changed", 48, "2026-09-11");
    expect(a).toBe(eventFingerprint("facility", "fac_1", "capacity_changed", 48, "2026-09-11"));
    expect(a).not.toBe(eventFingerprint("facility", "fac_1", "capacity_changed", 48, "2026-09-12"));
    expect(a).not.toBe(eventFingerprint("facility", "fac_1", "capacity_changed", 60, "2026-09-11"));
    expect(a).not.toBe(eventFingerprint("facility", "fac_2", "capacity_changed", 48, "2026-09-11"));
    expect(a).toMatch(/^[0-9a-f]{64}$/);
  });
});

describe("significance", () => {
  it("follows the documented scale", () => {
    expect(significanceFor(spec("status"), "announced", "under_construction")).toBe(90);
    expect(significanceFor(spec("operatorId"), "op_a", "op_b")).toBe(85);
    expect(significanceFor(spec("itCapacityMw"), 100, 125)).toBe(80); // +25 %
    expect(significanceFor(spec("itCapacityMw"), 100, 110)).toBe(50); // +10 %
    expect(significanceFor(spec("plannedPowerMw"), 120, 180)).toBe(80);
    expect(significanceFor(spec("openedOn"), "2026", "2027-Q2")).toBe(60);
    expect(significanceFor(spec("facilityType"), "colocation", "hyperscale")).toBe(20);
  });
  it("discovery: 65 for big or pipeline facilities, 40 otherwise", () => {
    expect(discoverySignificance(80, false)).toBe(65);
    expect(discoverySignificance(10, true)).toBe(65);
    expect(discoverySignificance(10, false)).toBe(40);
    expect(discoverySignificance(null, false)).toBe(40);
  });
});

describe("titles", () => {
  it("renders the planned capacity template", () => {
    const t = eventTitle("Compass Red Oak", spec("plannedPowerMw"), 120, 180);
    expect(t.summary).toBe("Planned capacity changed from 120 MW to 180 MW.");
    expect(t.title).toContain("planned capacity changed to 180 MW");
  });
  it("renders status and date templates", () => {
    expect(eventTitle("X", spec("status"), "announced", "under_construction").summary).toBe("Status changed from announced to under construction.");
    expect(eventTitle("X", spec("openedOn"), "2026", "2027-Q2").summary).toBe("Opening date changed from 2026 to Q2 2027.");
  });
});