import test from "node:test";
import assert from "node:assert/strict";
import fs from "node:fs";
import os from "node:os";
import path from "node:path";
import { pathToFileURL } from "node:url";

const TEST_DATA_DIR = fs.mkdtempSync(path.join(os.tmpdir(), "omniroute-models-dev-"));
process.env.DATA_DIR = TEST_DATA_DIR;

const core = await import("../../src/lib/db/core.ts");
const settingsDb = await import("../../src/lib/db/settings.ts");

const modulePath = path.join(process.cwd(), "src/lib/modelsDevSync.ts");
const originalFetch = globalThis.fetch;
const originalEnv = { ...process.env };
const loadedModules = new Set();

const MOCK_MODELS_DEV_DATA = {
  openai: {
    id: "openai",
    models: {
      "gpt-4o": {
        id: "gpt-4o",
        name: "GPT-4o",
        family: "gpt-4",
        attachment: true,
        reasoning: false,
        tool_call: true,
        structured_output: true,
        temperature: true,
        knowledge: "2024-10",
        release_date: "2024-05-13",
        last_updated: "2024-10-01",
        open_weights: false,
        cost: {
          input: 2.5,
          output: 10,
          cache_read: 1.25,
          cache_write: 2.5,
        },
        limit: {
          context: 128000,
          input: 128000,
          output: 16384,
        },
        modalities: {
          input: ["text", "image"],
          output: ["text"],
        },
      },
    },
  },
  anthropic: {
    id: "anthropic",
    models: {
      "claude-sonnet-4-20250514": {
        id: "claude-sonnet-4-20250514",
        name: "Claude Sonnet 4",
        tool_call: true,
        reasoning: false,
        attachment: true,
        structured_output: true,
        temperature: true,
        release_date: "2025-05-14",
        last_updated: "2025-05-14",
        open_weights: false,
        cost: {
          input: 3,
          output: 15,
          cache_read: 0.3,
        },
        limit: {
          context: 200000,
          output: 64000,
        },
        modalities: {
          input: ["text", "image"],
          output: ["text"],
        },
      },
    },
  },
};

async function importFresh(label) {
  const mod = await import(
    `${pathToFileURL(modulePath).href}?case=${label}-${Date.now()}-${Math.random()}`
  );
  loadedModules.add(mod);
  return mod;
}

function restoreEnv() {
  for (const key of Object.keys(process.env)) {
    if (!(key in originalEnv)) delete process.env[key];
  }
  Object.assign(process.env, originalEnv);
  process.env.DATA_DIR = TEST_DATA_DIR;
}

function resetStorage() {
  core.resetDbInstance();
  fs.rmSync(TEST_DATA_DIR, { recursive: true, force: true });
  fs.mkdirSync(TEST_DATA_DIR, { recursive: true });
}

async function waitFor(predicate, timeoutMs = 200) {
  const start = Date.now();
  while (Date.now() - start < timeoutMs) {
    const value = predicate();
    if (value) return value;
    await new Promise((resolve) => setTimeout(resolve, 10));
  }
  return null;
}

function mockFetchWith(body, status = 200, statusText = "OK") {
  globalThis.fetch = async () =>
    new Response(typeof body === "string" ? body : JSON.stringify(body), {
      status,
      statusText,
      headers: { "content-type": "application/json" },
    });
}

test.beforeEach(async () => {
  resetStorage();
});

test.afterEach(async () => {
  for (const mod of loadedModules) {
    if (typeof mod.stopPeriodicSync === "function") {
      mod.stopPeriodicSync();
    }
  }
  loadedModules.clear();
  globalThis.fetch = originalFetch;
  restoreEnv();
  core.resetDbInstance();
});

test.after(async () => {
  core.resetDbInstance();
  fs.rmSync(TEST_DATA_DIR, { recursive: true, force: true });
});

test("fetchModelsDev caches successful responses and rejects invalid JSON or non-ok responses", async () => {
  const modelsDev = await importFresh("fetch-cache");
  let calls = 0;
  globalThis.fetch = async () => {
    calls += 1;
    return new Response(JSON.stringify(MOCK_MODELS_DEV_DATA), {
      status: 200,
      headers: { "content-type": "application/json" },
    });
  };

  const first = await modelsDev.fetchModelsDev();
  const second = await modelsDev.fetchModelsDev();

  assert.strictEqual(first, second);
  assert.equal(calls, 1);

  const invalid = await importFresh("fetch-invalid-json");
  mockFetchWith("not-json");
  await assert.rejects(() => invalid.fetchModelsDev(), /invalid JSON/);

  const nonOk = await importFresh("fetch-non-ok");
  mockFetchWith({ error: "boom" }, 503, "Service Unavailable");
  await assert.rejects(() => nonOk.fetchModelsDev(), /models\.dev fetch failed \[503\]/);
});

test("modelsDev pricing helpers persist records, skip corrupted rows, and clear the namespace", async () => {
  const modelsDev = await importFresh("pricing-storage");
  const pricing = modelsDev.transformModelsDevToPricing(MOCK_MODELS_DEV_DATA);

  modelsDev.saveModelsDevPricing(pricing);
  const saved = modelsDev.getModelsDevPricing();
  assert.equal(saved.openai["gpt-4o"].input, 2.5);
  assert.equal(saved.cx["gpt-4o"].cache_creation, 2.5);

  const db = core.getDbInstance();
  db.prepare("INSERT INTO key_value (namespace, key, value) VALUES (?, ?, ?)").run(
    "models_dev_pricing",
    "corrupted",
    "{oops"
  );

  const withCorruption = modelsDev.getModelsDevPricing();
  assert.equal(withCorruption.corrupted, undefined);

  modelsDev.clearModelsDevPricing();
  assert.deepEqual(modelsDev.getModelsDevPricing(), {});
});

test("modelsDev capabilities helpers create the table, persist rows, filter by provider/model, and expose context limits", async () => {
  const modelsDev = await importFresh("capabilities-storage");
  const capabilities = modelsDev.transformModelsDevToCapabilities(MOCK_MODELS_DEV_DATA);

  modelsDev.ensureCapabilitiesTable();
  modelsDev.saveModelsDevCapabilities(capabilities);

  const allCaps = modelsDev.getSyncedCapabilities();
  const openaiOnly = modelsDev.getSyncedCapabilities("openai", "gpt-4o");

  assert.equal(allCaps.openai["gpt-4o"].tool_call, true);
  assert.equal(allCaps.anthropic["claude-sonnet-4-20250514"].attachment, true);
  assert.deepEqual(Object.keys(openaiOnly), ["openai"]);
  assert.equal(openaiOnly.openai["gpt-4o"].limit_context, 128000);
  assert.equal(modelsDev.getModelContextLimit("openai", "gpt-4o"), 128000);
  assert.equal(modelsDev.getModelContextLimit("openai", "missing"), null);

  modelsDev.clearModelsDevCapabilities();
  assert.deepEqual(modelsDev.getSyncedCapabilities(), {});
});

test("syncModelsDev supports dry-run mode, persistence, capability toggles, and failure reporting", async () => {
  const modelsDev = await importFresh("sync-main");
  mockFetchWith(MOCK_MODELS_DEV_DATA);

  const dryRun = await modelsDev.syncModelsDev({ dryRun: true, syncCapabilities: false });
  assert.equal(dryRun.success, true);
  assert.equal(dryRun.dryRun, true);
  assert.equal(dryRun.capabilityCount, 0);
  assert.ok(dryRun.data.pricing.openai["gpt-4o"]);
  assert.deepEqual(modelsDev.getModelsDevPricing(), {});

  const persisted = await modelsDev.syncModelsDev();
  assert.equal(persisted.success, true);
  assert.equal(persisted.dryRun, false);
  assert.ok(persisted.modelCount > 0);
  assert.ok(modelsDev.getModelsDevPricing().anthropic["claude-sonnet-4-20250514"]);
  assert.ok(modelsDev.getSyncedCapabilities().openai["gpt-4o"]);
  assert.ok(modelsDev.getSyncStatus().lastSync);
  assert.ok(modelsDev.getSyncStatus().lastSyncModelCount > 0);

  const failing = await importFresh("sync-failure");
  globalThis.fetch = async () => {
    throw new Error("network down");
  };
  const failed = await failing.syncModelsDev();
  assert.equal(failed.success, false);
  assert.match(failed.error, /network down/);
});

test("startPeriodicSync, stopPeriodicSync, getSyncStatus, and initModelsDevSync honor settings and avoid duplicate timers", async () => {
  const modelsDev = await importFresh("periodic-sync");
  mockFetchWith(MOCK_MODELS_DEV_DATA);

  modelsDev.startPeriodicSync(25);
  const started = modelsDev.getSyncStatus();
  assert.equal(started.enabled, true);
  assert.equal(started.intervalMs, 25);

  modelsDev.startPeriodicSync(99);
  assert.equal(modelsDev.getSyncStatus().intervalMs, 25);

  const syncedAt = await waitFor(() => modelsDev.getSyncStatus().lastSync, 300);
  assert.ok(syncedAt, "expected initial periodic sync to complete");
  assert.ok(modelsDev.getSyncStatus().nextSync);

  modelsDev.stopPeriodicSync();
  const stopped = modelsDev.getSyncStatus();
  assert.equal(stopped.enabled, false);
  assert.equal(stopped.nextSync, null);

  await settingsDb.updateSettings({
    modelsDevSyncEnabled: false,
    modelsDevSyncInterval: 15,
  });
  const disabled = await importFresh("init-disabled");
  await disabled.initModelsDevSync();
  assert.equal(disabled.getSyncStatus().enabled, false);

  await settingsDb.updateSettings({
    modelsDevSyncEnabled: true,
    modelsDevSyncInterval: 15,
  });
  const enabled = await importFresh("init-enabled");
  mockFetchWith(MOCK_MODELS_DEV_DATA);
  await enabled.initModelsDevSync();
  assert.equal(enabled.getSyncStatus().enabled, true);
  assert.equal(enabled.getSyncStatus().intervalMs, 15);
  await waitFor(() => enabled.getSyncStatus().lastSync, 300);
});