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";

const TEST_DATA_DIR = fs.mkdtempSync(path.join(os.tmpdir(), "omniroute-api-key-usage-limits-"));
process.env.DATA_DIR = TEST_DATA_DIR;
process.env.API_KEY_SECRET = process.env.API_KEY_SECRET || "usage-limit-test-secret";

const core = await import("../../src/lib/db/core.ts");
const localDb = await import("../../src/lib/localDb.ts");
const apiKeysDb = await import("../../src/lib/db/apiKeys.ts");
const usageHistory = await import("../../src/lib/usage/usageHistory.ts");
const usageLimits = await import("../../src/lib/usage/apiKeyUsageLimits.ts");

const NOW = Date.parse("2026-06-19T20:00:00.000Z");

async function resetStorage() {
  core.resetDbInstance();
  apiKeysDb.resetApiKeyState();
  usageHistory.clearPendingRequests();
  fs.rmSync(TEST_DATA_DIR, { recursive: true, force: true });
  fs.mkdirSync(TEST_DATA_DIR, { recursive: true });
}

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

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

test("API key USD usage limits persist and default off", async () => {
  const created = await apiKeysDb.createApiKey("Usage Limit Key", "machine-limit-01");

  let metadata = await apiKeysDb.getApiKeyMetadata(created.key);
  assert.equal(metadata?.usageLimitEnabled, false);
  assert.equal(metadata?.dailyUsageLimitUsd, null);
  assert.equal(metadata?.weeklyUsageLimitUsd, null);

  await apiKeysDb.updateApiKeyPermissions(created.id, {
    usageLimitEnabled: true,
    dailyUsageLimitUsd: 10.5,
    weeklyUsageLimitUsd: 50,
  });
  apiKeysDb.clearApiKeyCaches();

  metadata = await apiKeysDb.getApiKeyMetadata(created.key);
  assert.equal(metadata?.usageLimitEnabled, true);
  assert.equal(metadata?.dailyUsageLimitUsd, 10.5);
  assert.equal(metadata?.weeklyUsageLimitUsd, 50);
});

test("getApiKeyUsageLimitStatus aligns weekly USD spend with provider resetAt when available", async () => {
  await localDb.updatePricing({
    claude: {
      "claude-opus-4-8": {
        input: 1,
        cached: 1,
        output: 1,
        reasoning: 1,
        cache_creation: 1,
      },
    },
  });

  const created = await apiKeysDb.createApiKey("Metered Key", "machine-limit-02");
  await apiKeysDb.updateApiKeyPermissions(created.id, {
    usageLimitEnabled: true,
    dailyUsageLimitUsd: 10,
    weeklyUsageLimitUsd: 20,
  });

  await usageHistory.saveRequestUsage({
    provider: "claude",
    model: "claude-opus-4-8",
    apiKeyId: created.id,
    apiKeyName: "Metered Key",
    tokens: { input: 2_000_000, output: 0 },
    success: true,
    timestamp: "2026-06-19T12:00:00.000Z",
  });
  await usageHistory.saveRequestUsage({
    provider: "claude",
    model: "claude-opus-4-8",
    apiKeyId: created.id,
    apiKeyName: "Metered Key",
    tokens: { input: 3_000_000, output: 0 },
    success: true,
    timestamp: "2026-06-18T21:00:00.000Z",
  });
  await usageHistory.saveRequestUsage({
    provider: "claude",
    model: "claude-opus-4-8",
    apiKeyId: created.id,
    apiKeyName: "Metered Key",
    tokens: { input: 7_000_000, output: 0 },
    success: true,
    timestamp: "2026-06-18T12:00:00.000Z",
  });

  const metadata = await apiKeysDb.getApiKeyMetadata(created.key);
  assert.ok(metadata);

  const weeklyResetAt = "2026-06-25T20:00:00.000Z";
  const status = await usageLimits.getApiKeyUsageLimitStatus(
    { ...metadata, allowedConnections: ["conn-claude"] },
    {
      now: () => NOW,
      getProviderConnectionById: async () => ({
        id: "conn-claude",
        provider: "claude",
        isActive: true,
      }),
      getProviderConnections: async () => [],
      getProviderLimitsCache: () => ({
        plan: "Claude Max",
        quotas: {
          "weekly (7d)": {
            used: 27,
            total: 100,
            resetAt: weeklyResetAt,
          },
        },
        message: null,
        fetchedAt: new Date(NOW).toISOString(),
      }),
      getAllProviderLimitsCache: () => ({}),
    }
  );

  assert.equal(status.enabled, true);
  assert.equal(status.dailySpentUsd, 2);
  assert.equal(status.weeklySpentUsd, 5);
  assert.equal(status.dailyLimitUsd, 10);
  assert.equal(status.weeklyLimitUsd, 20);
  assert.equal(status.dailyResetAtIso, "2026-06-20T03:00:00.000Z");
  assert.equal(status.weeklyWindowStartIso, "2026-06-18T20:00:00.000Z");
  assert.equal(status.weeklyResetAtIso, weeklyResetAt);
  assert.equal(status.dailyExceeded, false);
  assert.equal(status.weeklyExceeded, false);
});

test("getApiKeyUsageLimitStatus cuts weekly USD spend at observed provider quota reset", async () => {
  await localDb.updatePricing({
    claude: {
      "claude-opus-4-8": {
        input: 1,
        cached: 1,
        output: 1,
        reasoning: 1,
        cache_creation: 1,
      },
    },
  });

  const created = await apiKeysDb.createApiKey("Reset Cut Key", "machine-limit-reset");
  await apiKeysDb.updateApiKeyPermissions(created.id, {
    usageLimitEnabled: true,
    dailyUsageLimitUsd: 10,
    weeklyUsageLimitUsd: 20,
  });

  await usageHistory.saveRequestUsage({
    provider: "claude",
    model: "claude-opus-4-8",
    apiKeyId: created.id,
    apiKeyName: "Reset Cut Key",
    tokens: { input: 7_000_000, output: 0 },
    success: true,
    timestamp: "2026-06-19T23:30:00.000Z",
  });
  await usageHistory.saveRequestUsage({
    provider: "claude",
    model: "claude-opus-4-8",
    apiKeyId: created.id,
    apiKeyName: "Reset Cut Key",
    tokens: { input: 2_000_000, output: 0 },
    success: true,
    timestamp: "2026-06-20T02:00:00.000Z",
  });

  const db = core.getDbInstance();
  const insertSnapshot = db.prepare(`
    INSERT INTO quota_snapshots (
      provider,
      connection_id,
      window_key,
      remaining_percentage,
      is_exhausted,
      next_reset_at,
      window_duration_ms,
      raw_data,
      created_at
    ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
  `);
  insertSnapshot.run(
    "claude",
    "conn-claude",
    "weekly (7d)",
    72,
    0,
    "2026-06-25T23:00:00.000Z",
    null,
    null,
    "2026-06-19T23:55:00.000Z"
  );
  insertSnapshot.run(
    "claude",
    "conn-claude",
    "weekly (7d)",
    100,
    0,
    "2026-06-25T23:00:00.000Z",
    null,
    null,
    "2026-06-20T01:42:52.590Z"
  );
  insertSnapshot.run(
    "claude",
    "conn-claude",
    "weekly (7d)",
    99,
    0,
    "2026-06-25T23:00:00.000Z",
    null,
    null,
    "2026-06-20T02:10:00.000Z"
  );
  db.prepare(
    `
    INSERT INTO provider_quota_reset_events
      (provider, connection_id, window_key, window_started_at, window_resets_at,
       observed_at, previous_remaining_percentage, new_remaining_percentage,
       previous_used_percentage, new_used_percentage, raw_data)
    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
  `
  ).run(
    "claude",
    "conn-claude",
    "weekly (7d)",
    "2026-06-18T23:00:00.000Z",
    "2026-06-25T23:00:00.000Z",
    "2026-06-18T23:04:00.000Z",
    0,
    100,
    100,
    0,
    null
  );

  const metadata = await apiKeysDb.getApiKeyMetadata(created.key);
  assert.ok(metadata);

  const weeklyResetAt = "2026-06-25T23:00:00.000Z";
  const status = await usageLimits.getApiKeyUsageLimitStatus(
    { ...metadata, allowedConnections: ["conn-claude"] },
    {
      now: () => Date.parse("2026-06-20T14:30:00.000Z"),
      getProviderConnectionById: async () => ({
        id: "conn-claude",
        provider: "claude",
        isActive: true,
      }),
      getProviderConnections: async () => [],
      getProviderLimitsCache: () => ({
        plan: "Claude Max",
        quotas: {
          "weekly (7d)": {
            used: 5,
            total: 100,
            resetAt: weeklyResetAt,
          },
        },
        message: null,
        fetchedAt: "2026-06-20T14:30:00.000Z",
      }),
      getAllProviderLimitsCache: () => ({}),
    }
  );

  assert.equal(status.weeklyWindowStartIso, "2026-06-20T01:42:52.590Z");
  assert.equal(status.weeklySpentUsd, 2);
});

test("buildApiKeyUsageLimitText returns API-key quota spend percentage and reset lines", async () => {
  const text = usageLimits.buildApiKeyUsageLimitText(
    {
      enabled: true,
      dailyLimitUsd: 10,
      weeklyLimitUsd: 50,
      dailySpentUsd: 2,
      weeklySpentUsd: 5.25,
      dailyWindowStartIso: "2026-06-19T03:00:00.000Z",
      dailyResetAtIso: "2026-06-20T03:00:00.000Z",
      weeklyWindowStartIso: "2026-06-12T20:00:00.000Z",
      weeklyResetAtIso: "2026-06-25T20:00:00.000Z",
      dailyExceeded: false,
      weeklyExceeded: false,
    },
    Date.parse("2026-06-19T20:00:00.000Z")
  );

  assert.equal(
    text,
    [
      "Daily quota",
      "$10.00",
      "Daily spent",
      "$2.00",
      "Daily used",
      "20%",
      "Resets in 7h 0m",
      "",
      "Weekly quota",
      "$50.00",
      "Weekly spent",
      "$5.25",
      "Weekly used",
      "11%",
      "Resets in 6d 0h 0m",
    ].join("\n")
  );
});

test("buildApiKeyUsageLimitPercentText returns remaining percentages only", () => {
  const text = usageLimits.buildApiKeyUsageLimitPercentText(
    {
      enabled: true,
      dailyLimitUsd: 10,
      weeklyLimitUsd: 50,
      dailySpentUsd: 2,
      weeklySpentUsd: 5.25,
      dailyWindowStartIso: "2026-06-19T03:00:00.000Z",
      dailyResetAtIso: "2026-06-20T03:00:00.000Z",
      weeklyWindowStartIso: "2026-06-12T20:00:00.000Z",
      weeklyResetAtIso: "2026-06-25T20:00:00.000Z",
      dailyExceeded: false,
      weeklyExceeded: false,
    },
    Date.parse("2026-06-19T20:00:00.000Z")
  );

  assert.equal(
    text,
    ["Daily", "80% left", "⏱ reset in 7h 0m", "", "Weekly", "90% left", "⏱ reset in 6d 0h 0m"].join(
      "\n"
    )
  );
});

test("buildApiKeyUsageLimitRejection includes over-quota percentage and reset hint", async () => {
  const response = usageLimits.buildApiKeyUsageLimitRejection(
    new Request("http://localhost/v1/messages", {
      headers: { "anthropic-version": "2023-06-01" },
    }),
    {
      enabled: true,
      dailyLimitUsd: 10,
      weeklyLimitUsd: 1,
      dailySpentUsd: 0.25,
      weeklySpentUsd: 1.09,
      dailyWindowStartIso: "2026-06-19T03:00:00.000Z",
      dailyResetAtIso: "2026-06-20T03:00:00.000Z",
      weeklyWindowStartIso: "2026-06-12T20:00:00.000Z",
      weeklyResetAtIso: "2026-06-25T20:00:00.000Z",
      dailyExceeded: false,
      weeklyExceeded: true,
    },
    Date.parse("2026-06-19T20:00:00.000Z")
  );

  assert.equal(response.status, 400);
  const body = (await response.json()) as { error: { message: string } };
  assert.equal(
    body.error.message,
    "This API key reached its weekly USD usage quota ($1.09 of $1.00, 109%). Resets in 6d 0h 0m. Choose another allowed model after reset."
  );
});

test("buildApiKeyUsageLimitRejection can hide USD amounts for client-facing policy errors", async () => {
  const response = usageLimits.buildApiKeyUsageLimitRejection(
    new Request("http://localhost/v1/messages", {
      headers: { "anthropic-version": "2023-06-01" },
    }),
    {
      enabled: true,
      dailyLimitUsd: 10,
      weeklyLimitUsd: 1,
      dailySpentUsd: 0.25,
      weeklySpentUsd: 1.09,
      dailyWindowStartIso: "2026-06-19T03:00:00.000Z",
      dailyResetAtIso: "2026-06-20T03:00:00.000Z",
      weeklyWindowStartIso: "2026-06-12T20:00:00.000Z",
      weeklyResetAtIso: "2026-06-25T20:00:00.000Z",
      dailyExceeded: false,
      weeklyExceeded: true,
    },
    Date.parse("2026-06-19T20:00:00.000Z"),
    { showUsd: false }
  );

  assert.equal(response.status, 400);
  const body = (await response.json()) as { error: { message: string } };
  assert.equal(
    body.error.message,
    "This API key reached its weekly usage quota (109%). Resets in 6d 0h 0m. Choose another allowed model after reset."
  );
});

test("buildApiKeyUsageLimitRejection uses 400 so Claude Code does not trigger login", () => {
  const response = usageLimits.buildApiKeyUsageLimitRejection(
    new Request("http://localhost/v1/messages", {
      headers: { "anthropic-version": "2023-06-01" },
    }),
    {
      enabled: true,
      dailyLimitUsd: 10,
      weeklyLimitUsd: 50,
      dailySpentUsd: 12,
      weeklySpentUsd: 20,
      dailyWindowStartIso: "2026-06-19T03:00:00.000Z",
      dailyResetAtIso: "2026-06-20T03:00:00.000Z",
      weeklyWindowStartIso: "2026-06-12T20:00:00.000Z",
      weeklyResetAtIso: "2026-06-19T20:00:00.000Z",
      dailyExceeded: true,
      weeklyExceeded: false,
    }
  );

  assert.equal(response.status, 400);
});