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

// Unmock keys service — test the real implementation
vi.unmock("../services/keys.js");

vi.mock("../services/db.js", () => ({
  default: { query: vi.fn(), connect: vi.fn(), on: vi.fn(), end: vi.fn() },
  pool: { query: vi.fn(), connect: vi.fn(), on: vi.fn(), end: vi.fn() },
  queryWithRetry: vi.fn().mockResolvedValue({ rows: [], rowCount: 0 }),
  connectWithRetry: vi.fn().mockResolvedValue(undefined),
  initDatabase: vi.fn().mockResolvedValue(undefined),
  cleanupStaleData: vi.fn(),
  isTransientError: vi.fn(),
}));

vi.mock("../services/logger.js", () => ({
  default: { info: vi.fn(), error: vi.fn(), warn: vi.fn(), debug: vi.fn() },
}));

import { queryWithRetry } from "../services/db.js";
import { createProKey, downgradeByCustomer, updateKeyEmail, updateEmailByCustomer } from "../services/keys.js";

const mockQuery = vi.mocked(queryWithRetry);

describe("Keys Branch Coverage", () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  describe("createProKey - UPSERT conflict path (line 142)", () => {
    it("should return existing key when stripe_customer_id already exists in DB but NOT in cache", async () => {
      // Scenario: Another pod created a key for this customer, so it's in DB but not in our cache
      // The UPSERT will hit ON CONFLICT and return the existing key via RETURNING clause
      
      const existingKey = {
        key: "df_pro_existing_abc",
        tier: "pro",
        email: "existing@test.com",
        created_at: "2026-01-01T00:00:00.000Z",
        stripe_customer_id: "cus_existing",
      };

      // Mock: UPSERT returns the existing key (ON CONFLICT triggered)
      mockQuery.mockResolvedValueOnce({ rows: [existingKey], rowCount: 1 } as any);

      const result = await createProKey("new@test.com", "cus_existing");

      // Should return the existing key
      expect(result.key).toBe("df_pro_existing_abc");
      expect(result.email).toBe("existing@test.com"); // Original email, not the new one
      expect(result.stripeCustomerId).toBe("cus_existing");
      expect(result.tier).toBe("pro");

      // Verify UPSERT was called
      const upsertCall = mockQuery.mock.calls.find(
        (c) => typeof c[0] === "string" && c[0].includes("ON CONFLICT")
      );
      expect(upsertCall).toBeTruthy();
    });

    it("should handle conflict when inserting new key with existing customer ID", async () => {
      // First call: load empty cache
      mockQuery.mockResolvedValueOnce({ rows: [], rowCount: 0 } as any);
      
      const { loadKeys } = await import("../services/keys.js");
      await loadKeys();
      
      vi.clearAllMocks();

      const conflictingKey = {
        key: "df_pro_conflict_xyz",
        tier: "pro",
        email: "conflict@test.com",
        created_at: "2025-12-31T00:00:00.000Z",
        stripe_customer_id: "cus_conflict",
      };

      // UPSERT returns existing key on conflict
      mockQuery.mockResolvedValueOnce({ rows: [conflictingKey], rowCount: 1 } as any);

      const result = await createProKey("different-email@test.com", "cus_conflict");

      expect(result.key).toBe("df_pro_conflict_xyz");
      expect(result.email).toBe("conflict@test.com"); // Original, not the new email
    });
  });

  describe("downgradeByCustomer - customer not found (lines 153-155)", () => {
    it("should return false when customer is NOT in cache AND NOT in DB", async () => {
      // Mock: SELECT query returns empty (customer not in DB)
      mockQuery.mockResolvedValueOnce({ rows: [], rowCount: 0 } as any);

      const result = await downgradeByCustomer("cus_nonexistent");

      expect(result).toBe(false);
      
      // Verify SELECT was called
      expect(mockQuery).toHaveBeenCalledWith(
        expect.stringContaining("SELECT"),
        expect.arrayContaining(["cus_nonexistent"])
      );

      // Verify UPDATE was NOT called (no point updating a non-existent key)
      const updateCalls = mockQuery.mock.calls.filter((c) =>
        (c[0] as string).includes("UPDATE")
      );
      expect(updateCalls).toHaveLength(0);
    });

    it("should return false for completely unknown stripe customer ID", async () => {
      // Load empty cache first
      mockQuery.mockResolvedValueOnce({ rows: [], rowCount: 0 } as any);
      const { loadKeys } = await import("../services/keys.js");
      await loadKeys();
      
      vi.clearAllMocks();

      // Mock: DB also doesn't have this customer
      mockQuery.mockResolvedValueOnce({ rows: [], rowCount: 0 } as any);

      const result = await downgradeByCustomer("cus_unknown_12345");

      expect(result).toBe(false);
    });
  });

  describe("updateKeyEmail - DB fallback path (line 175)", () => {
    it("should return false when key is NOT in cache AND NOT in DB", async () => {
      // Mock: SELECT query returns empty (key not in DB)
      mockQuery.mockResolvedValueOnce({ rows: [], rowCount: 0 } as any);

      const result = await updateKeyEmail("df_pro_nonexistent", "new@test.com");

      expect(result).toBe(false);
      
      // Verify SELECT was called
      expect(mockQuery).toHaveBeenCalledWith(
        expect.stringContaining("SELECT"),
        expect.arrayContaining(["df_pro_nonexistent"])
      );

      // Verify UPDATE was NOT called
      const updateCalls = mockQuery.mock.calls.filter((c) =>
        (c[0] as string).includes("UPDATE")
      );
      expect(updateCalls).toHaveLength(0);
    });

    it("should update and cache when key exists in DB but not in cache", async () => {
      const dbKey = {
        key: "df_pro_db_only",
        tier: "pro",
        email: "old@test.com",
        created_at: "2026-01-15T00:00:00.000Z",
        stripe_customer_id: "cus_db_only",
      };

      // Mock: SELECT returns the key from DB
      mockQuery
        .mockResolvedValueOnce({ rows: [dbKey], rowCount: 1 } as any)
        .mockResolvedValueOnce({ rows: [], rowCount: 1 } as any); // UPDATE success

      const result = await updateKeyEmail("df_pro_db_only", "updated@test.com");

      expect(result).toBe(true);
      
      // Verify UPDATE was called
      expect(mockQuery).toHaveBeenCalledWith(
        expect.stringContaining("UPDATE"),
        expect.arrayContaining(["updated@test.com", "df_pro_db_only"])
      );
    });
  });

  describe("updateEmailByCustomer - DB fallback path (line 175)", () => {
    it("should return false when customer is NOT in cache AND NOT in DB", async () => {
      // Mock: SELECT query returns empty
      mockQuery.mockResolvedValueOnce({ rows: [], rowCount: 0 } as any);

      const result = await updateEmailByCustomer("cus_nonexistent", "new@test.com");

      expect(result).toBe(false);
      
      // Verify SELECT was called
      expect(mockQuery).toHaveBeenCalledWith(
        expect.stringContaining("SELECT"),
        expect.arrayContaining(["cus_nonexistent"])
      );

      // Verify UPDATE was NOT called
      const updateCalls = mockQuery.mock.calls.filter((c) =>
        (c[0] as string).includes("UPDATE")
      );
      expect(updateCalls).toHaveLength(0);
    });

    it("should update and cache when customer exists in DB but not in cache", async () => {
      const dbKey = {
        key: "df_pro_customer_db",
        tier: "pro",
        email: "oldcustomer@test.com",
        created_at: "2026-02-01T00:00:00.000Z",
        stripe_customer_id: "cus_db_customer",
      };

      // Mock: SELECT returns the key
      mockQuery
        .mockResolvedValueOnce({ rows: [dbKey], rowCount: 1 } as any)
        .mockResolvedValueOnce({ rows: [], rowCount: 1 } as any); // UPDATE success

      const result = await updateEmailByCustomer("cus_db_customer", "newcustomer@test.com");

      expect(result).toBe(true);
      
      // Verify UPDATE was called with correct params
      expect(mockQuery).toHaveBeenCalledWith(
        expect.stringContaining("UPDATE"),
        expect.arrayContaining(["newcustomer@test.com", "cus_db_customer"])
      );
    });
  });
});