/**
 * Integration tests for economy-tick determinism (seeded rng, period seeding),
 * price-change emission threshold, and the economy event log wiring.
 */
import { afterAll, beforeAll, describe, expect, it } from "vitest";
import type { Payload } from "payload";
import { getPayload } from "payload";
import config from "@/payload.config";

import { EventTypes } from "@/utils/event-log/eventTypes";
import { emitEconomyEvents } from "@/lib/economy/events";
import {
  createSeededRng,
  driftArtificialDemand,
  periodSeed,
  PRICE_CHANGE_THRESHOLD,
  shouldEmitPriceChange,
} from "@/lib/economy/math";
import { ECONOMY_DEFAULTS } from "@/lib/economy/types";
import { ensureMarketStateDocs, processEconomyTick } from "@/lib/economy/tick";

describe("economy seeded rng + period seeding (pure)", () => {
  it("createSeededRng produces identical sequences for the same seed", () => {
    const a = createSeededRng(42);
    const b = createSeededRng(42);
    expect([a(), a(), a()]).toEqual([b(), b(), b()]);
  });

  it("createSeededRng produces different sequences for different seeds", () => {
    const a = createSeededRng(1);
    const b = createSeededRng(2);
    expect([a(), a(), a()]).not.toEqual([b(), b(), b()]);
  });

  it("periodSeed is stable within a period and changes across periods", () => {
    const now = new Date("2026-09-06T12:34:56.000Z");
    const withinPeriod = new Date("2026-09-06T12:35:59.000Z");
    const nextPeriod = new Date("2026-09-06T13:35:59.000Z");
    // 60-minute periods: 12:34 and 12:35 fall in the same period window.
    expect(periodSeed(now, 60)).toBe(periodSeed(withinPeriod, 60));
    expect(periodSeed(now, 60)).not.toBe(periodSeed(nextPeriod, 60));
  });

  it("seeded rng drives driftArtificialDemand deterministically", () => {
    const seed = periodSeed(new Date("2026-09-06T00:00:00Z"), 60);
    const first = driftArtificialDemand(50, 50, 0.05, createSeededRng(seed));
    const again = driftArtificialDemand(50, 50, 0.05, createSeededRng(seed));
    expect(first).toBe(again);
  });
});

describe("price-change emission threshold (pure)", () => {
  it("PRICE_CHANGE_THRESHOLD is 0.05", () => {
    expect(PRICE_CHANGE_THRESHOLD).toBe(0.05);
  });

  it("shouldEmitPriceChange emits for changes >= threshold", () => {
    expect(shouldEmitPriceChange(1, 1.06)).toBe(true);
    expect(shouldEmitPriceChange(1, 0.9)).toBe(true);
  });

  it("shouldEmitPriceChange is quiet below the threshold", () => {
    expect(shouldEmitPriceChange(1, 1.001)).toBe(false);
    expect(shouldEmitPriceChange(1, 1)).toBe(false);
  });
});

describe("economy events (DB)", () => {
  let payload: Payload;
  const run = `econ-ev-${Date.now().toString(36)}`;
  let resourceId: number | null = null;

  beforeAll(async () => {
    const payloadConfig = await config;
    payload = await getPayload({ config: payloadConfig });
  });

  afterAll(async () => {
    // Remove fixtures in reverse dependency order; tolerate missing docs.
    if (resourceId !== null) {
      const states = await payload
        .find({
          collection: "market-state",
          where: {
            and: [
              { itemType: { equals: "resource" } },
              { itemId: { equals: resourceId } },
            ],
          },
          depth: 0,
          limit: 10,
          overrideAccess: true,
        })
        .catch(() => null);
      for (const doc of states?.docs ?? []) {
        await payload
          .delete({ collection: "market-state", id: doc.id })
          .catch(() => {});
      }
      await payload
        .delete({ collection: "resources", id: resourceId })
        .catch(() => {});
    }
    const events = await payload
      .find({
        collection: "game-event-logs",
        where: { type: { in: ["economy:tick", "economy:price-change"] } },
        depth: 0,
        limit: 100,
        overrideAccess: true,
      })
      .catch(() => null);
    for (const doc of events?.docs ?? []) {
      await payload
        .delete({ collection: "game-event-logs", id: doc.id })
        .catch(() => {});
    }
  });

  async function createFixtureResource(): Promise<number> {
    const doc = await payload.create({
      collection: "resources",
      data: {
        name: `${run} Res`,
        codeName: `${run}-res`,
        baseValue: 100,
        rarity: "common",
        unitOfMeasure: "kg",
        massPerUnit: 1,
        gridWidth: 1,
        gridHeight: 1,
        tradeable: true,
        approvalStatus: "in_progress",
        type: "physical",
        economy: { enabled: true, maxModifier: 0.5 },
      },
    });
    resourceId = doc.id;
    return doc.id;
  }

  async function findStateDoc(resourceIdValue: number) {
    const states = await payload.find({
      collection: "market-state",
      where: {
        and: [
          { itemType: { equals: "resource" } },
          { itemId: { equals: resourceIdValue } },
        ],
      },
      depth: 0,
      limit: 1,
      overrideAccess: true,
    });
    const doc = states.docs[0];
    expect(doc).toBeDefined();
    return doc as NonNullable<typeof doc>;
  }

  /** Give each DB test a clean event slate so counts are exact and independent. */
  async function deleteEconomyEvents(): Promise<void> {
    const events = await payload.find({
      collection: "game-event-logs",
      where: { type: { in: ["economy:tick", "economy:price-change"] } },
      depth: 0,
      limit: 100,
      overrideAccess: true,
    });
    for (const doc of events.docs) {
      await payload
        .delete({ collection: "game-event-logs", id: doc.id })
        .catch(() => {});
    }
  }

  it("processEconomyTick skips already-computed docs within the same period", async () => {
    const id = await createFixtureResource();
    await ensureMarketStateDocs(payload, {
      items: [{ itemType: "resource", itemId: id }],
    });
    const periodStart = new Date("2026-09-06T12:00:00.000Z");
    const first = await processEconomyTick(payload, {
      now: periodStart,
      rng: createSeededRng(7),
      items: [{ itemType: "resource", itemId: id }],
      masterGate: true,
      periodStart,
    });
    expect(first.processed).toBeGreaterThan(0);
    expect(first.skipped).toBe(0);
    const second = await processEconomyTick(payload, {
      now: periodStart,
      rng: createSeededRng(7),
      items: [{ itemType: "resource", itemId: id }],
      masterGate: true,
      periodStart,
    });
    expect(second.processed).toBe(0);
    expect(second.skipped).toBeGreaterThan(0);
  });

  it("emits economy:price-change event when the modifier moves beyond the threshold", async () => {
    const id = resourceId;
    if (id === null) throw new Error("fixture resource missing");
    // Force a large ratio so the modifier jumps by >= PRICE_CHANGE_THRESHOLD.
    const stateDoc = await findStateDoc(id);
    await payload.update({
      collection: "market-state",
      id: stateDoc.id,
      data: { realDemand: 10, currentSupply: 10 },
      overrideAccess: true,
    });
    const result = await processEconomyTick(payload, {
      now: new Date("2026-09-06T13:00:00.000Z"),
      rng: createSeededRng(11),
      items: [{ itemType: "resource", itemId: id }],
      masterGate: true,
    });
    const change = result.priceChanges.find((pc) => pc.itemId === id);
    expect(change).toBeDefined();
    if (!change) throw new Error("expected a price change");
    expect(change.stateId).toBe(stateDoc.id);
    expect(shouldEmitPriceChange(change.from, change.to)).toBe(true);

    await deleteEconomyEvents();
    await emitEconomyEvents(payload, result);

    const logged = await payload.find({
      collection: "game-event-logs",
      where: { type: { equals: EventTypes.EconomyPriceChange } },
      depth: 0,
      limit: 10,
      overrideAccess: true,
    });
    const mine = logged.docs.find(
      (d) => d.targetId === stateDoc.id && d.targetCollection === "market-state",
    );
    expect(mine).toBeDefined();
    expect(mine?.system).toBe(true);
    expect(mine?.data).toMatchObject({ itemType: "resource", itemId: id });
  });

  it("emits only the batch economy:tick summary when prices stay quiet", async () => {
    const id = resourceId;
    if (id === null) throw new Error("fixture resource missing");
    // Reset to balanced numbers, neutral modifier, and zero real demand so
    // the cold-start gate keeps the modifier at exactly 1.
    const stateDoc = await findStateDoc(id);
    await payload.update({
      collection: "market-state",
      id: stateDoc.id,
      data: {
        gmBaselineDemand: 100,
        artificialDemand: 100,
        currentSupply: 100,
        realDemand: 0,
        priceModifier: 1,
      },
      overrideAccess: true,
    });
    const result = await processEconomyTick(payload, {
      now: new Date("2026-09-06T14:00:00.000Z"),
      rng: createSeededRng(23),
      items: [{ itemType: "resource", itemId: id }],
      masterGate: true,
      knobs: { ...ECONOMY_DEFAULTS, artificialDemandDrift: 0.001 },
    });
    expect(result.priceChanges.length).toBe(0);

    await deleteEconomyEvents();
    await emitEconomyEvents(payload, result);

    const priceChanges = await payload.find({
      collection: "game-event-logs",
      where: { type: { equals: EventTypes.EconomyPriceChange } },
      depth: 0,
      limit: 10,
      overrideAccess: true,
    });
    expect(priceChanges.docs.length).toBe(0);

    const summaries = await payload.find({
      collection: "game-event-logs",
      where: { type: { equals: EventTypes.EconomyTick } },
      depth: 0,
      limit: 10,
      overrideAccess: true,
    });
    expect(summaries.docs.length).toBe(1);
    expect(summaries.docs[0]?.system).toBe(true);
  });
});