import { describe, it, expect } from "vitest";
import {
  // Schemas
  vinSchema,
  loginSchema,
  registerSchema,
  forgotPasswordSchema,
  resetPasswordSchema,
  changelogChangeTypeEnum,
  changelogEntrySchema,
  createChangelogEntrySchema,
  updateChangelogEntrySchema,
  paginationSchema,
  // Utils
  isValidVin,
  validateVinCheckDigit,
  extractWmi,
  extractModelYear,
  formatTRY,
  kurusToLira,
  liraToKurus,
  formatVin,
  formatDate,
  formatDateTime,
  slugify,
  generateReferralCode,
  // Constants
  VIN_REGEX,
  EMAIL_REGEX,
  OEM_CODE_REGEX,
  PLANS,
  REFERRAL_REWARDS,
  CURRENCY,
  FULL_PLAN_BRAND_LIMIT,
  ERROR_CODES,
} from "./index";

// --------------- schemas/vin ---------------

describe("vinSchema", () => {
  const validVin = "WVWZZZ1JZ3W597935";

  it("accepts a valid 17-character VIN", () => {
    const result = vinSchema.safeParse(validVin);
    expect(result.success).toBe(true);
  });

  it("transforms VIN to uppercase after validation", () => {
    const result = vinSchema.safeParse("WVWZZZ1JZ3W597935");
    expect(result.success).toBe(true);
    if (result.success) {
      expect(result.data).toBe("WVWZZZ1JZ3W597935");
    }
  });

  it("rejects VIN shorter than 17 chars", () => {
    const result = vinSchema.safeParse("WVWZZZ1JZ3W59793");
    expect(result.success).toBe(false);
  });

  it("rejects VIN longer than 17 chars", () => {
    const result = vinSchema.safeParse("WVWZZZ1JZ3W597935X");
    expect(result.success).toBe(false);
  });

  it("rejects VIN with I character (not allowed)", () => {
    const result = vinSchema.safeParse("WVWZZZ1IZ3W597935");
    expect(result.success).toBe(false);
  });

  it("rejects VIN with O character (not allowed)", () => {
    const result = vinSchema.safeParse("WVWZZZ1OZ3W597935");
    expect(result.success).toBe(false);
  });

  it("rejects VIN with Q character (not allowed)", () => {
    const result = vinSchema.safeParse("WVWZZZ1QZ3W597935");
    expect(result.success).toBe(false);
  });

  it("rejects empty string", () => {
    const result = vinSchema.safeParse("");
    expect(result.success).toBe(false);
  });

  it("accepts 17-char uppercase string with valid chars", () => {
    const result = vinSchema.safeParse("ABCDEFGHJKLMNPRST");
    expect(result.success).toBe(true); // This is 17 valid chars (no I, O, Q)
  });

  it("rejects string with lowercase chars (regex runs before transform)", () => {
    const result = vinSchema.safeParse("abcdefghjklmnprst");
    expect(result.success).toBe(false); // VIN_REGEX requires uppercase
  });
});

// --------------- schemas/auth ---------------

describe("loginSchema", () => {
  it("accepts valid login", () => {
    const result = loginSchema.safeParse({
      email: "user@example.com",
      password: "password123",
    });
    expect(result.success).toBe(true);
  });

  it("rejects invalid email", () => {
    const result = loginSchema.safeParse({
      email: "not-an-email",
      password: "password123",
    });
    expect(result.success).toBe(false);
  });

  it("rejects short password", () => {
    const result = loginSchema.safeParse({
      email: "user@example.com",
      password: "short",
    });
    expect(result.success).toBe(false);
  });

  it("rejects missing password", () => {
    const result = loginSchema.safeParse({ email: "user@example.com" });
    expect(result.success).toBe(false);
  });

  it("rejects missing email", () => {
    const result = loginSchema.safeParse({ password: "password123" });
    expect(result.success).toBe(false);
  });
});

describe("registerSchema", () => {
  const validRegister = {
    name: "John Doe",
    email: "john@example.com",
    password: "Aa123456",
  };

  it("accepts valid registration", () => {
    const result = registerSchema.safeParse(validRegister);
    expect(result.success).toBe(true);
  });

  it("rejects short name", () => {
    const result = registerSchema.safeParse({ ...validRegister, name: "J" });
    expect(result.success).toBe(false);
  });

  it("rejects name exceeding 100 chars", () => {
    const result = registerSchema.safeParse({ ...validRegister, name: "A".repeat(101) });
    expect(result.success).toBe(false);
  });

  it("rejects invalid email", () => {
    const result = registerSchema.safeParse({ ...validRegister, email: "bad-email" });
    expect(result.success).toBe(false);
  });

  it("rejects password without uppercase", () => {
    const result = registerSchema.safeParse({ ...validRegister, password: "aa123456" });
    expect(result.success).toBe(false);
  });

  it("rejects password without lowercase", () => {
    const result = registerSchema.safeParse({ ...validRegister, password: "AA123456" });
    expect(result.success).toBe(false);
  });

  it("rejects password without number", () => {
    const result = registerSchema.safeParse({ ...validRegister, password: "Aaabcdef" });
    expect(result.success).toBe(false);
  });

  it("rejects password shorter than 8 chars", () => {
    const result = registerSchema.safeParse({ ...validRegister, password: "Aa1" });
    expect(result.success).toBe(false);
  });

  it("rejects password longer than 128 chars", () => {
    const result = registerSchema.safeParse({
      ...validRegister,
      password: "Aa1" + "x".repeat(126),
    });
    expect(result.success).toBe(false);
  });
});

describe("forgotPasswordSchema", () => {
  it("accepts valid email", () => {
    const result = forgotPasswordSchema.safeParse({ email: "user@example.com" });
    expect(result.success).toBe(true);
  });

  it("rejects invalid email", () => {
    const result = forgotPasswordSchema.safeParse({ email: "not-email" });
    expect(result.success).toBe(false);
  });

  it("rejects empty object", () => {
    const result = forgotPasswordSchema.safeParse({});
    expect(result.success).toBe(false);
  });
});

describe("resetPasswordSchema", () => {
  const validReset = {
    token: "abc123token",
    password: "Aa123456",
  };

  it("accepts valid reset input", () => {
    const result = resetPasswordSchema.safeParse(validReset);
    expect(result.success).toBe(true);
  });

  it("rejects empty token", () => {
    const result = resetPasswordSchema.safeParse({ ...validReset, token: "" });
    expect(result.success).toBe(false);
  });

  it("rejects missing token", () => {
    const result = resetPasswordSchema.safeParse({ password: "Aa123456" });
    expect(result.success).toBe(false);
  });

  it("rejects weak password", () => {
    const result = resetPasswordSchema.safeParse({ token: "abc", password: "weak" });
    expect(result.success).toBe(false);
  });
});

// --------------- schemas/pagination ---------------

describe("paginationSchema", () => {
  it("accepts empty object and applies defaults", () => {
    const result = paginationSchema.safeParse({});
    expect(result.success).toBe(true);
    if (result.success) {
      expect(result.data.page).toBe(1);
      expect(result.data.limit).toBe(20);
    }
  });

  it("coerces string page to number", () => {
    const result = paginationSchema.safeParse({ page: "3", limit: "50" });
    expect(result.success).toBe(true);
    if (result.success) {
      expect(result.data.page).toBe(3);
      expect(result.data.limit).toBe(50);
      expect(typeof result.data.page).toBe("number");
      expect(typeof result.data.limit).toBe("number");
    }
  });

  it("rejects page less than 1", () => {
    const result = paginationSchema.safeParse({ page: 0 });
    expect(result.success).toBe(false);
  });

  it("rejects limit greater than 100", () => {
    const result = paginationSchema.safeParse({ limit: 101 });
    expect(result.success).toBe(false);
  });

  it("rejects limit less than 1", () => {
    const result = paginationSchema.safeParse({ limit: 0 });
    expect(result.success).toBe(false);
  });

  it("rejects non-integer page", () => {
    const result = paginationSchema.safeParse({ page: 1.5 });
    expect(result.success).toBe(false);
  });
});

// --------------- schemas/changelog ---------------

describe("changelogChangeTypeEnum", () => {
  it("accepts fix", () => {
    expect(changelogChangeTypeEnum.safeParse("fix").success).toBe(true);
  });

  it("accepts feature", () => {
    expect(changelogChangeTypeEnum.safeParse("feature").success).toBe(true);
  });

  it("accepts improvement", () => {
    expect(changelogChangeTypeEnum.safeParse("improvement").success).toBe(true);
  });

  it("rejects invalid value", () => {
    expect(changelogChangeTypeEnum.safeParse("bugfix").success).toBe(false);
  });
});

describe("changelogEntrySchema", () => {
  const validEntry = {
    id: "123e4567-e89b-12d3-a456-426614174000",
    changeType: "fix",
    title: "Fixed bug",
    description: "This is a fix description",
    publishedAt: "2026-01-15T10:00:00.000Z",
    createdAt: "2026-01-15T10:00:00.000Z",
    updatedAt: "2026-01-15T10:00:00.000Z",
  };

  it("accepts valid changelog entry", () => {
    expect(changelogEntrySchema.safeParse(validEntry).success).toBe(true);
  });

  it("rejects missing id", () => {
    const { id, ...rest } = validEntry;
    expect(changelogEntrySchema.safeParse(rest).success).toBe(false);
  });

  it("rejects non-UUID id", () => {
    expect(changelogEntrySchema.safeParse({ ...validEntry, id: "not-uuid" }).success).toBe(false);
  });

  it("rejects empty title", () => {
    expect(changelogEntrySchema.safeParse({ ...validEntry, title: "" }).success).toBe(false);
  });

  it("rejects empty description", () => {
    expect(changelogEntrySchema.safeParse({ ...validEntry, description: "" }).success).toBe(false);
  });

  it("rejects invalid publishedAt datetime", () => {
    expect(
      changelogEntrySchema.safeParse({ ...validEntry, publishedAt: "not-a-date" }).success,
    ).toBe(false);
  });

  it("rejects invalid changeType", () => {
    expect(
      changelogEntrySchema.safeParse({ ...validEntry, changeType: "bugfix" }).success,
    ).toBe(false);
  });
});

describe("createChangelogEntrySchema", () => {
  const validCreate = {
    changeType: "feature",
    title: "New feature",
    description: "Description of the new feature",
    publishedAt: "2026-01-15T10:00:00.000Z",
  };

  it("accepts valid create input", () => {
    expect(createChangelogEntrySchema.safeParse(validCreate).success).toBe(true);
  });

  it("rejects missing title", () => {
    const { title, ...rest } = validCreate;
    expect(createChangelogEntrySchema.safeParse(rest).success).toBe(false);
  });

  it("rejects empty description", () => {
    expect(createChangelogEntrySchema.safeParse({ ...validCreate, description: "" }).success).toBe(
      false,
    );
  });

  it("does not require id field", () => {
    // create schema doesn't have id
    expect(validCreate).not.toHaveProperty("id");
  });
});

describe("updateChangelogEntrySchema", () => {
  it("accepts partial update (empty object)", () => {
    expect(updateChangelogEntrySchema.safeParse({}).success).toBe(true);
  });

  it("accepts single field update", () => {
    expect(updateChangelogEntrySchema.safeParse({ title: "Updated" }).success).toBe(true);
  });

  it("accepts full update", () => {
    expect(
      updateChangelogEntrySchema.safeParse({
        changeType: "fix",
        title: "Full update",
        description: "Updated description",
        publishedAt: "2026-01-15T10:00:00.000Z",
      }).success,
    ).toBe(true);
  });

  it("rejects invalid changeType in partial update", () => {
    expect(updateChangelogEntrySchema.safeParse({ changeType: "bugfix" }).success).toBe(false);
  });

  it("rejects empty title in partial update", () => {
    expect(updateChangelogEntrySchema.safeParse({ title: "" }).success).toBe(false);
  });
});

// --------------- utils/vin-validator ---------------

describe("isValidVin", () => {
  it("returns true for valid VIN", () => {
    expect(isValidVin("WVWZZZ1JZ3W597935")).toBe(true);
  });

  it("returns false for VIN with invalid characters", () => {
    expect(isValidVin("WVWZZZ1IZ3W597935")).toBe(false);
  });

  it("returns false for short VIN", () => {
    expect(isValidVin("WVWZZZ1JZ3W59793")).toBe(false);
  });

  it("returns false for empty string", () => {
    expect(isValidVin("")).toBe(false);
  });

  it("converts lowercase to uppercase for validation", () => {
    expect(isValidVin("wvwzzz1jz3w597935")).toBe(true);
  });
});

describe("validateVinCheckDigit", () => {
  it("returns true for a VIN with valid check digit", () => {
    // Known-good VIN with check digit that validates
    expect(validateVinCheckDigit("1HGBH41JXMN109186")).toBe(true);
  });

  it("returns false for invalid VIN", () => {
    expect(validateVinCheckDigit("INVALIDVIN1234567")).toBe(false);
  });

  it("returns false for VIN with wrong check digit", () => {
    // Take a valid VIN and change position 8 (the check digit)
    expect(validateVinCheckDigit("WVWZZZ1JZ9W597935")).toBe(false);
  });
});

describe("extractWmi", () => {
  it("extracts first 3 characters as WMI", () => {
    expect(extractWmi("WVWZZZ1JZ3W597935")).toBe("WVW");
  });

  it("uppercases the result", () => {
    expect(extractWmi("wvwzzz1jz3w597935")).toBe("WVW");
  });
});

describe("extractModelYear", () => {
  it("extracts year for 2010 (A)", () => {
    expect(extractModelYear("WVWZZZ1JZAW597935")).toBe(2010);
  });

  it("extracts year for 2025 (S)", () => {
    expect(extractModelYear("WVWZZZ1JZSW597935")).toBe(2025);
  });

  it("returns null for unknown year character", () => {
    expect(extractModelYear("WVWZZZ1JZ0W597935")).toBeNull();
  });

  it("handles lowercase input", () => {
    expect(extractModelYear("wvwzzz1jzaw597935")).toBe(2010);
  });
});

// --------------- utils/currency ---------------

describe("formatTRY", () => {
  it("formats kurus to TRY", () => {
    const result = formatTRY(200_00);
    expect(result).toContain("200");
  });

  it("formats zero", () => {
    const result = formatTRY(0);
    expect(result).toContain("0");
  });
});

describe("kurusToLira", () => {
  it("converts 100 kurus to 1 lira", () => {
    expect(kurusToLira(100)).toBe(1);
  });

  it("converts 20000 kurus to 200 lira", () => {
    expect(kurusToLira(200_00)).toBe(200);
  });

  it("converts 0", () => {
    expect(kurusToLira(0)).toBe(0);
  });
});

describe("liraToKurus", () => {
  it("converts 1 lira to 100 kurus", () => {
    expect(liraToKurus(1)).toBe(100);
  });

  it("converts 200 lira to 20000 kurus", () => {
    expect(liraToKurus(200)).toBe(200_00);
  });

  it("rounds to nearest kurus", () => {
    expect(liraToKurus(0.005)).toBe(1);
  });
});

// --------------- utils/formatters ---------------

describe("formatVin", () => {
  it("uppercases and strips invalid chars", () => {
    expect(formatVin("wvw-zzz 1jz3w597935")).toBe("WVWZZZ1JZ3W597935");
  });

  it("handles already clean VIN", () => {
    expect(formatVin("WVWZZZ1JZ3W597935")).toBe("WVWZZZ1JZ3W597935");
  });
});

describe("formatDate", () => {
  it("formats a Date object", () => {
    const d = new Date(2026, 0, 15);
    const result = formatDate(d);
    expect(result).toBe("15.01.2026");
  });

  it("formats an ISO string", () => {
    const result = formatDate("2026-01-15");
    expect(result).toBe("15.01.2026");
  });
});

describe("formatDateTime", () => {
  it("returns a string containing date and time", () => {
    const d = new Date(2026, 0, 15, 14, 30);
    const result = formatDateTime(d);
    expect(result).toContain("15.01.2026");
  });
});

describe("slugify", () => {
  it("lowercases and replaces spaces with dashes", () => {
    expect(slugify("Hello World")).toBe("hello-world");
  });

  it("replaces Turkish characters", () => {
    expect(slugify("ğüşıöç")).toBe("gusioc");
  });

  it("removes leading/trailing dashes", () => {
    expect(slugify(" hello ")).toBe("hello");
  });

  it("handles special characters", () => {
    expect(slugify("Merhaba Dünya!")).toBe("merhaba-dunya");
  });
});

describe("generateReferralCode", () => {
  it("returns 8-character string", () => {
    const code = generateReferralCode();
    expect(code).toHaveLength(8);
  });

  it("contains only uppercase letters and numbers", () => {
    const code = generateReferralCode();
    expect(/^[A-Z0-9]+$/.test(code)).toBe(true);
  });

  it("does not contain ambiguous characters", () => {
    const code = generateReferralCode();
    expect(code).not.toMatch(/[IO0]/);
  });

  it("generates different codes on repeated calls", () => {
    const codes = new Set(Array.from({ length: 10 }, () => generateReferralCode()));
    // Extremely unlikely all 10 generate the same code
    expect(codes.size).toBeGreaterThan(1);
  });
});

// --------------- constants/regex ---------------

describe("VIN_REGEX", () => {
  it("matches a valid VIN", () => {
    expect(VIN_REGEX.test("WVWZZZ1JZ3W597935")).toBe(true);
  });

  it("does not match VIN with I", () => {
    expect(VIN_REGEX.test("WVWZZZ1IZ3W597935")).toBe(false);
  });

  it("does not match VIN with O", () => {
    expect(VIN_REGEX.test("WVWZZZ1OZ3W597935")).toBe(false);
  });
});

describe("EMAIL_REGEX", () => {
  it("matches valid email", () => {
    expect(EMAIL_REGEX.test("user@example.com")).toBe(true);
  });

  it("does not match missing @", () => {
    expect(EMAIL_REGEX.test("userexample.com")).toBe(false);
  });

  it("does not match missing domain", () => {
    expect(EMAIL_REGEX.test("user@")).toBe(false);
  });
});

describe("OEM_CODE_REGEX", () => {
  it("matches valid OEM code", () => {
    expect(OEM_CODE_REGEX.test("06A-109-108-B")).toBe(true);
  });

  it("matches short OEM code", () => {
    expect(OEM_CODE_REGEX.test("ABC")).toBe(true);
  });
});

// --------------- constants/plans ---------------

describe("PLANS", () => {
  it("has SINGLE, DOUBLE, TRIPLE, and FULL plans", () => {
    expect(PLANS.SINGLE).toBeDefined();
    expect(PLANS.DOUBLE).toBeDefined();
    expect(PLANS.TRIPLE).toBeDefined();
    expect(PLANS.FULL).toBeDefined();
  });

  it("FULL plan has brandCount 0 (unlimited)", () => {
    expect(PLANS.FULL.brandCount).toBe(0);
  });

  it("SINGLE plan has brandCount 1", () => {
    expect(PLANS.SINGLE.brandCount).toBe(1);
  });

  it("all plans have positive price", () => {
    for (const plan of Object.values(PLANS)) {
      expect(plan.priceMonthly).toBeGreaterThan(0);
      expect(plan.priceYearly).toBeGreaterThan(0);
    }
  });
});

describe("FULL_PLAN_BRAND_LIMIT", () => {
  it("equals 999", () => {
    expect(FULL_PLAN_BRAND_LIMIT).toBe(999);
  });
});

describe("REFERRAL_REWARDS", () => {
  it("TIER_1 requires 3 referrals for 7 extension days", () => {
    expect(REFERRAL_REWARDS.TIER_1.count).toBe(3);
    expect(REFERRAL_REWARDS.TIER_1.extensionDays).toBe(7);
  });

  it("TIER_2 requires 5 referrals for 30 extension days", () => {
    expect(REFERRAL_REWARDS.TIER_2.count).toBe(5);
    expect(REFERRAL_REWARDS.TIER_2.extensionDays).toBe(30);
  });
});

describe("CURRENCY", () => {
  it("is TRY", () => {
    expect(CURRENCY).toBe("TRY");
  });
});

// --------------- constants/error-codes ---------------

describe("ERROR_CODES", () => {
  it("has auth error codes", () => {
    expect(ERROR_CODES.INVALID_CREDENTIALS).toBe("AUTH_001");
    expect(ERROR_CODES.EMAIL_ALREADY_EXISTS).toBe("AUTH_002");
    expect(ERROR_CODES.SESSION_EXPIRED).toBe("AUTH_003");
    expect(ERROR_CODES.UNAUTHORIZED).toBe("AUTH_004");
    expect(ERROR_CODES.FORBIDDEN).toBe("AUTH_005");
  });

  it("has VIN error codes", () => {
    expect(ERROR_CODES.INVALID_VIN).toBe("VIN_001");
    expect(ERROR_CODES.VIN_DECODE_FAILED).toBe("VIN_002");
    expect(ERROR_CODES.BRAND_NOT_SUPPORTED).toBe("VIN_003");
  });

  it("has subscription error codes", () => {
    expect(ERROR_CODES.NO_ACTIVE_SUBSCRIPTION).toBe("SUB_001");
    expect(ERROR_CODES.BRAND_ACCESS_DENIED).toBe("SUB_002");
    expect(ERROR_CODES.INVALID_BRAND_COUNT).toBe("SUB_003");
    expect(ERROR_CODES.SUBSCRIPTION_ALREADY_ACTIVE).toBe("SUB_004");
  });

  it("has payment error codes", () => {
    expect(ERROR_CODES.PAYMENT_FAILED).toBe("PAY_001");
    expect(ERROR_CODES.EFT_RECEIPT_REQUIRED).toBe("PAY_003");
    expect(ERROR_CODES.PAYMENT_ALREADY_PROCESSED).toBe("PAY_004");
  });

  it("has general error codes", () => {
    expect(ERROR_CODES.NOT_FOUND).toBe("GEN_001");
    expect(ERROR_CODES.VALIDATION_ERROR).toBe("GEN_002");
    expect(ERROR_CODES.INTERNAL_ERROR).toBe("GEN_003");
    expect(ERROR_CODES.RATE_LIMITED).toBe("GEN_004");
    expect(ERROR_CODES.CONFLICT).toBe("GEN_005");
  });

  it("has integration error codes", () => {
    expect(ERROR_CODES.PL24_ERROR).toBe("INT_001");
    expect(ERROR_CODES.EMEX_ERROR).toBe("INT_002");
    expect(ERROR_CODES.CORGI_ERROR).toBe("INT_003");
  });
});