import { strict as assert } from "node:assert";
import { describe, it } from "node:test";

import { pickLanguage } from "../app/services/invoice/i18n";
import { reserveWebhook, type DedupeDeps } from "../app/services/webhooks/dedupe.server";

describe("pickLanguage", () => {
  it("returns 'de' only for explicit German locales", () => {
    assert.equal(pickLanguage("de"), "de");
    assert.equal(pickLanguage("de-AT"), "de");
    assert.equal(pickLanguage("de-DE"), "de");
    assert.equal(pickLanguage("de_CH"), "de");
    assert.equal(pickLanguage("DE-AT"), "de"); // case-insensitive
  });

  it("returns 'en' for non-German locales (regression: it/fr/es no longer fall back to de)", () => {
    assert.equal(pickLanguage("en"), "en");
    assert.equal(pickLanguage("en-US"), "en");
    assert.equal(pickLanguage("it"), "en");
    assert.equal(pickLanguage("it-IT"), "en");
    assert.equal(pickLanguage("fr"), "en");
    assert.equal(pickLanguage("fr-FR"), "en");
    assert.equal(pickLanguage("es"), "en");
    assert.equal(pickLanguage("hu-HU"), "en");
  });

  it("falls back to 'de' for empty/unknown input so the per-shop default chain still works", () => {
    assert.equal(pickLanguage(undefined), "de");
    assert.equal(pickLanguage(null), "de");
    assert.equal(pickLanguage(""), "de");
  });
});

function makeRequest(headers: Record<string, string> = {}): Request {
  return new Request("https://example.com/webhooks/test", {
    method: "POST",
    headers,
  });
}

type ExistingRow = { webhookId: string; status: string; receivedAt: Date } | null;

/**
 * Build a DedupeDeps stub.
 *  - "ok"     : create() succeeds (fresh reservation).
 *  - "p2002"  : create() conflicts; findUnique() returns `existing`.
 *  - "boom"   : create() throws a non-P2002 error (fail-open).
 */
function makeDeps(
  behaviour: "ok" | "p2002" | "boom",
  existing: ExistingRow = null,
): DedupeDeps & { calls: { commit: number; release: number; update: number } } {
  const calls = { commit: 0, release: 0, update: 0 };
  return {
    calls,
    db: {
      processedWebhook: {
        create: async () => {
          if (behaviour === "ok") return {};
          if (behaviour === "p2002") {
            const err = new Error("Unique constraint failed") as Error & { code?: string };
            err.code = "P2002";
            throw err;
          }
          throw new Error("DB unavailable");
        },
        findUnique: async () => existing,
        update: async () => {
          calls.update += 1;
          calls.commit += 1;
          return {};
        },
        delete: async () => {
          calls.release += 1;
          return {};
        },
      },
    },
  };
}

describe("reserveWebhook", () => {
  it("returns a reservation on first delivery (insert succeeds)", async () => {
    const req = makeRequest({ "x-shopify-webhook-id": "abc-123" });
    const res = await reserveWebhook(req, "shop.myshopify.com", "ORDERS_CREATE", makeDeps("ok"));
    assert.ok(res, "expected a reservation");
    assert.equal(res!.webhookId, "abc-123");
  });

  it("returns null for an already-processed (done) delivery", async () => {
    const req = makeRequest({ "x-shopify-webhook-id": "abc-123" });
    const deps = makeDeps("p2002", {
      webhookId: "abc-123",
      status: "done",
      receivedAt: new Date(),
    });
    assert.equal(await reserveWebhook(req, "shop.myshopify.com", "ORDERS_CREATE", deps), null);
  });

  it("returns null for a fresh in-flight (processing) delivery", async () => {
    const req = makeRequest({ "x-shopify-webhook-id": "abc-123" });
    const deps = makeDeps("p2002", {
      webhookId: "abc-123",
      status: "processing",
      receivedAt: new Date(), // fresh lease
    });
    assert.equal(await reserveWebhook(req, "shop.myshopify.com", "ORDERS_CREATE", deps), null);
  });

  it("reclaims a stale (crashed) processing reservation", async () => {
    const req = makeRequest({ "x-shopify-webhook-id": "abc-123" });
    const deps = makeDeps("p2002", {
      webhookId: "abc-123",
      status: "processing",
      receivedAt: new Date(Date.now() - 10 * 60 * 1000), // 10 min ago > 5 min lease
    });
    const res = await reserveWebhook(req, "shop.myshopify.com", "ORDERS_CREATE", deps);
    assert.ok(res, "expected to reclaim the stale reservation");
    assert.equal(deps.calls.update, 1, "stale reclaim should renew the lease via update()");
  });

  it("commit() flips the row to done; release() deletes it", async () => {
    const req = makeRequest({ "x-shopify-webhook-id": "abc-123" });
    const deps = makeDeps("ok");
    const res = await reserveWebhook(req, "shop.myshopify.com", "ORDERS_CREATE", deps);
    await res!.commit();
    assert.equal(deps.calls.commit, 1);
    await res!.release();
    assert.equal(deps.calls.release, 1);
  });

  it("fails open (returns a no-op reservation) when the dedupe table errors", async () => {
    const req = makeRequest({ "x-shopify-webhook-id": "abc-123" });
    const res = await reserveWebhook(req, "shop.myshopify.com", "ORDERS_CREATE", makeDeps("boom"));
    assert.ok(res, "fail-open must still process — never silently drop a webhook");
    assert.equal(res!.webhookId, "abc-123");
  });

  it("returns a no-op reservation when the X-Shopify-Webhook-Id header is missing", async () => {
    const req = makeRequest();
    const res = await reserveWebhook(req, "shop.myshopify.com", "ORDERS_CREATE", makeDeps("ok"));
    assert.ok(res, "missing id => process without dedupe");
    assert.equal(res!.webhookId, null);
  });
});