import { describe, it, expect, vi, beforeEach } from "vitest";

// Mock proxyAwareFetch before any imports that use it
vi.mock("../../open-sse/utils/proxyFetch.js", () => ({
  proxyAwareFetch: vi.fn(),
}));

import { proxyAwareFetch } from "../../open-sse/utils/proxyFetch.js";
import {
  parseWeeklyQuotaSummary,
  fetchAntigravityWeeklyQuota,
  _clearWeeklyCache,
} from "../../open-sse/services/usage/antigravity-weekly.js";

// — Fixtures ——————————————————————————————————————————————
const GEMINI_GROUP = {
  displayName: "Gemini Models",
  buckets: [
    {
      bucketId: "gemini-weekly-bucket",
      displayName: "Weekly Limit",
      remainingFraction: 0.75,
      resetTime: "2026-09-15T00:00:00Z",
    },
    {
      bucketId: "gemini-daily-bucket",
      displayName: "Daily Limit",
      remainingFraction: 0.9,
      resetTime: "2026-09-09T00:00:00Z",
    },
  ],
};

const CLAUDE_GPT_GROUP = {
  displayName: "Claude and GPT models",
  buckets: [
    {
      bucketId: "claude-gpt-weekly",
      displayName: "Weekly Quota",
      remainingFraction: 0.5,
      resetTime: "2026-09-14T00:00:00Z",
    },
  ],
};

const FULL_RESPONSE = { groups: [GEMINI_GROUP, CLAUDE_GPT_GROUP] };

const NESTED_RESPONSE = {
  quotaSummary: {
    groups: [GEMINI_GROUP, CLAUDE_GPT_GROUP],
  },
};

// — parseWeeklyQuotaSummary ———————————————————————————————
describe("parseWeeklyQuotaSummary", () => {
  it("extracts Gemini weekly quota from top-level groups", () => {
    const result = parseWeeklyQuotaSummary(FULL_RESPONSE);
    expect(result.gemini_weekly).toMatchObject({
      used: 250,
      total: 1000,
      remainingPercentage: 75,
      displayName: "Gemini (Weekly)",
      unlimited: false,
    });
    expect(result.gemini_weekly.resetAt).toBe("2026-09-15T00:00:00.000Z");
  });

  it("extracts Claude & GPT weekly quota", () => {
    const result = parseWeeklyQuotaSummary(FULL_RESPONSE);
    expect(result.claude_gpt_weekly).toMatchObject({
      used: 500,
      total: 1000,
      remainingPercentage: 50,
      displayName: "Claude & GPT (Weekly)",
      unlimited: false,
    });
    expect(result.claude_gpt_weekly.resetAt).toBe("2026-09-14T00:00:00.000Z");
  });

  it("handles alternate nested quotaSummary.groups shape", () => {
    const result = parseWeeklyQuotaSummary(NESTED_RESPONSE);
    expect(result.gemini_weekly).toBeDefined();
    expect(result.claude_gpt_weekly).toBeDefined();
    expect(result.gemini_weekly.remainingPercentage).toBe(75);
    expect(result.claude_gpt_weekly.remainingPercentage).toBe(50);
  });

  it("skips non-weekly buckets", () => {
    const data = {
      groups: [{
        displayName: "Gemini Models",
        buckets: [
          {
            bucketId: "gemini-daily-bucket",
            displayName: "Daily Limit",
            remainingFraction: 0.9,
            resetTime: "2026-09-09T00:00:00Z",
          },
        ],
      }],
    };
    const result = parseWeeklyQuotaSummary(data);
    expect(result).toEqual({});
  });

  it("skips disabled weekly buckets", () => {
    const data = {
      groups: [{
        displayName: "Gemini Models",
        buckets: [{
          bucketId: "gemini-weekly-bucket",
          displayName: "Weekly Limit",
          remainingFraction: 0.75,
          resetTime: "2026-09-15T00:00:00Z",
          disabled: true,
        }],
      }],
    };
    const result = parseWeeklyQuotaSummary(data);
    expect(result).toEqual({});
  });

  it("returns empty object for null/undefined input", () => {
    expect(parseWeeklyQuotaSummary(null)).toEqual({});
    expect(parseWeeklyQuotaSummary(undefined)).toEqual({});
    expect(parseWeeklyQuotaSummary("string")).toEqual({});
  });

  it("returns empty object for response with no groups", () => {
    expect(parseWeeklyQuotaSummary({})).toEqual({});
    expect(parseWeeklyQuotaSummary({ groups: "not-array" })).toEqual({});
    expect(parseWeeklyQuotaSummary({ quotaSummary: {} })).toEqual({});
  });

  it("handles groups with no buckets gracefully", () => {
    const data = {
      groups: [{ displayName: "Gemini Models" }],
    };
    expect(parseWeeklyQuotaSummary(data)).toEqual({});
  });

  it("handles bucket with non-finite remainingFraction", () => {
    const data = {
      groups: [{
        displayName: "Gemini Models",
        buckets: [{
          bucketId: "weekly-bucket",
          displayName: "Weekly",
          remainingFraction: "not-a-number",
        }],
      }],
    };
    expect(parseWeeklyQuotaSummary(data)).toEqual({});
  });

  it("ignores groups that don't match known families", () => {
    const data = {
      groups: [{
        displayName: "Unknown AI Provider",
        buckets: [{
          bucketId: "weekly-bucket",
          displayName: "Weekly",
          remainingFraction: 0.5,
        }],
      }],
    };
    expect(parseWeeklyQuotaSummary(data)).toEqual({});
  });
});

// — fetchAntigravityWeeklyQuota ———————————————————————————
describe("fetchAntigravityWeeklyQuota", () => {
  beforeEach(() => {
    proxyAwareFetch.mockReset();
    _clearWeeklyCache();
  });

  it("fetches and returns parsed weekly quota on success", async () => {
    proxyAwareFetch.mockResolvedValue({
      ok: true,
      json: async () => FULL_RESPONSE,
    });

    const result = await fetchAntigravityWeeklyQuota("token", "project-1");
    expect(result.gemini_weekly).toBeDefined();
    expect(result.claude_gpt_weekly).toBeDefined();
  });

  it("returns {} on HTTP 401", async () => {
    proxyAwareFetch.mockResolvedValue({ ok: false, status: 401 });
    const result = await fetchAntigravityWeeklyQuota("token", "project-1");
    expect(result).toEqual({});
  });

  it("returns {} on HTTP 403", async () => {
    proxyAwareFetch.mockResolvedValue({ ok: false, status: 403 });
    const result = await fetchAntigravityWeeklyQuota("token", "project-1");
    expect(result).toEqual({});
  });

  it("returns {} on HTTP 404", async () => {
    proxyAwareFetch.mockResolvedValue({ ok: false, status: 404 });
    const result = await fetchAntigravityWeeklyQuota("token", "project-1");
    expect(result).toEqual({});
  });

  it("returns {} on HTTP 429", async () => {
    proxyAwareFetch.mockResolvedValue({ ok: false, status: 429 });
    const result = await fetchAntigravityWeeklyQuota("token", "project-1");
    expect(result).toEqual({});
  });

  it("returns {} on network error", async () => {
    proxyAwareFetch.mockRejectedValue(new Error("network timeout"));
    const result = await fetchAntigravityWeeklyQuota("token", "project-1");
    expect(result).toEqual({});
  });

  it("returns {} on malformed JSON response", async () => {
    proxyAwareFetch.mockResolvedValue({
      ok: true,
      json: async () => { throw new SyntaxError("Unexpected token"); },
    });
    const result = await fetchAntigravityWeeklyQuota("token", "project-1");
    expect(result).toEqual({});
  });

  it("deduplicates concurrent requests for the same account", async () => {
    let resolveResponse;
    proxyAwareFetch.mockReturnValue(new Promise(resolve => {
      resolveResponse = resolve;
    }));

    const p1 = fetchAntigravityWeeklyQuota("token", "project-1");
    const p2 = fetchAntigravityWeeklyQuota("token", "project-1");

    resolveResponse({ ok: true, json: async () => FULL_RESPONSE });

    const [r1, r2] = await Promise.all([p1, p2]);
    expect(r1).toEqual(r2);
    expect(proxyAwareFetch).toHaveBeenCalledTimes(1);
  });

  it("serves cached result within TTL", async () => {
    proxyAwareFetch.mockResolvedValue({
      ok: true,
      json: async () => FULL_RESPONSE,
    });

    await fetchAntigravityWeeklyQuota("token", "project-1");
    const result = await fetchAntigravityWeeklyQuota("token", "project-1");

    expect(proxyAwareFetch).toHaveBeenCalledTimes(1);
    expect(result.gemini_weekly).toBeDefined();
  });

  it("sends correct headers and body", async () => {
    proxyAwareFetch.mockResolvedValue({
      ok: true,
      json: async () => ({ groups: [] }),
    });

    await fetchAntigravityWeeklyQuota("token", "project-1");

    expect(proxyAwareFetch).toHaveBeenCalledWith(
      "https://daily-cloudcode-pa.googleapis.com/v1internal:retrieveUserQuotaSummary",
      expect.objectContaining({
        method: "POST",
        headers: expect.objectContaining({
          "Authorization": "Bearer token",
          "User-Agent": "antigravity/ide/2.11.0 darwin/arm64",
          "Content-Type": "application/json",
          "X-Client-Name": "antigravity",
        }),
        body: JSON.stringify({ project: "project-1" }),
      }),
      expect.any(Object),
    );
  });
});

// — Integration: weekly failure does not affect existing quotas —————
describe("weekly quota isolation from existing quota", () => {
  beforeEach(() => {
    proxyAwareFetch.mockReset();
    _clearWeeklyCache();
  });

  it("existing getAntigravityUsage succeeds even when weekly RPC fails", async () => {
    proxyAwareFetch.mockImplementation(async (url) => {
      if (url.includes(":loadCodeAssist")) {
        return {
          ok: true,
          status: 200,
          json: async () => ({ cloudaicompanionProject: "p1", currentTier: { name: "Pro" }, paidTier: { id: "g1-pro-tier", name: "Google AI Pro" } }),
        };
      }
      if (url.includes(":fetchAvailableModels")) {
        return {
          ok: true,
          status: 200,
          json: async () => ({
            models: {
              "gemini-3.8-flash-high": {
                displayName: "Gemini 3.8 Flash (High)",
                quotaInfo: { remainingFraction: 0.85, resetTime: "2026-09-15T00:00:00Z" },
              },
            },
          }),
        };
      }
      if (url.includes(":retrieveUserQuotaSummary")) {
        throw new Error("weekly endpoint unavailable");
      }
      return { ok: false, status: 404 };
    });

    const { getAntigravityUsage } = await import("../../open-sse/services/usage/google.js");
    const result = await getAntigravityUsage("token", {});

    expect(result.quotas["gemini-3.8-flash-high"]).toMatchObject({
      used: 150,
      total: 1000,
      remainingPercentage: 85,
    });
    expect(result.quotas.gemini_weekly).toBeUndefined();
    expect(result.quotas.claude_gpt_weekly).toBeUndefined();
    expect(result.message).toBeUndefined();
  });

  it("free-tier accounts only show weekly quotas, not per-model short-window quotas", async () => {
    proxyAwareFetch.mockImplementation(async (url) => {
      if (url.includes(":loadCodeAssist")) {
        return {
          ok: true,
          status: 200,
          json: async () => ({ cloudaicompanionProject: "p1", currentTier: { name: "Starter" }, paidTier: { id: "free-tier", name: "Antigravity Starter Quota" } }),
        };
      }
      if (url.includes(":fetchAvailableModels")) {
        return {
          ok: true,
          status: 200,
          json: async () => ({
            models: {
              "gemini-3.8-flash-high": {
                displayName: "Gemini 3.8 Flash (High)",
                quotaInfo: { remainingFraction: 1, resetTime: "2026-09-15T00:00:00Z" },
              },
              "claude-sonnet-4-6": {
                displayName: "Claude Sonnet 4.6",
                // Missing remainingFraction — free tier exhausted
                quotaInfo: { resetTime: "2026-09-13T12:00:00Z" },
              },
            },
          }),
        };
      }
      if (url.includes(":retrieveUserQuotaSummary")) {
        return {
          ok: true,
          status: 200,
          json: async () => ({
            groups: [{
              displayName: "Gemini Models",
              buckets: [{
                bucketId: "gemini-weekly",
                displayName: "Weekly Limit Remaining",
                remainingFraction: 1,
                resetTime: "2026-09-15T00:00:00Z",
              }],
            }, {
              displayName: "Claude and GPT models",
              buckets: [{
                bucketId: "3p-weekly",
                displayName: "Weekly Limit Remaining",
                remainingFraction: 0,
                resetTime: "2026-09-13T12:00:00Z",
              }],
            }],
          }),
        };
      }
      return { ok: false, status: 404 };
    });

    const { getAntigravityUsage } = await import("../../open-sse/services/usage/google.js");
    const result = await getAntigravityUsage("token", {});

    // Per-model quotas should be absent (free-tier accounts skip model parsing)
    expect(result.quotas["gemini-3.8-flash-high"]).toBeUndefined();
    expect(result.quotas["claude-sonnet-4-6"]).toBeUndefined();

    // Only weekly quotas should appear
    expect(result.quotas.gemini_weekly).toMatchObject({
      used: 0,
      total: 1000,
      remainingPercentage: 100,
    });
    expect(result.quotas.claude_gpt_weekly).toMatchObject({
      used: 1000,
      total: 1000,
      remainingPercentage: 0,
    });
  });

  it("reconciles weekly quota to 0% when all paid-tier family models are exhausted", async () => {
    proxyAwareFetch.mockImplementation(async (url) => {
      if (url.includes(":loadCodeAssist")) {
        return {
          ok: true,
          status: 200,
          json: async () => ({ cloudaicompanionProject: "p1", currentTier: { name: "Pro" }, paidTier: { id: "g1-pro-tier", name: "Google AI Pro" } }),
        };
      }
      if (url.includes(":fetchAvailableModels")) {
        return {
          ok: true,
          status: 200,
          json: async () => ({
            models: {
              "gemini-3.8-flash-high": {
                displayName: "Gemini 3.8 Flash (High)",
                // Exhausted model: no remainingFraction, future resetTime
                quotaInfo: { resetTime: "2026-09-13T12:00:00Z" },
              },
            },
          }),
        };
      }
      if (url.includes(":retrieveUserQuotaSummary")) {
        return {
          ok: true,
          status: 200,
          json: async () => ({
            groups: [{
              displayName: "Gemini Models",
              buckets: [{
                bucketId: "gemini-weekly",
                displayName: "Weekly Limit Remaining",
                remainingFraction: 1,
                resetTime: "2026-09-15T00:00:00Z",
              }],
            }],
          }),
        };
      }
      return { ok: false, status: 404 };
    });

    const { getAntigravityUsage } = await import("../../open-sse/services/usage/google.js");
    const result = await getAntigravityUsage("token", {});

    // Per-model quota should show exhausted
    expect(result.quotas["gemini-3.8-flash-high"].remainingPercentage).toBe(0);
    // Weekly quota should be reconciled to 0% with the family reset time
    expect(result.quotas.gemini_weekly).toMatchObject({
      used: 1000,
      total: 1000,
      remainingPercentage: 0,
      resetAt: "2026-09-13T12:00:00.000Z",
    });
  });
});