import { z } from "zod"

const optionalStringMaxSchema = (max: number) =>
    z.preprocess(
        (value) => (value === "" || value == null ? undefined : value),
        z.string().max(max, `Must be at most ${max} characters`).optional(),
    )

const optionalNumberSchema = z.preprocess(
    (value) => (value === "" || value == null ? undefined : value),
    z.coerce.number().int().optional(),
)

const relationFieldSchema = z
    .object({ value: z.string(), label: z.string() })
    .nullable()
    .optional()

const vendorFormSchema = z.object({
    first_name: z.string().trim().min(1, "First name is required").max(50, "First name must be at most 50 characters"),
    last_name: z.string().trim().min(1, "Last name is required").max(50, "Last name must be at most 50 characters"),
    company_name: z.string().trim().min(1, "Company name is required").max(50, "Company name must be at most 50 characters"),
    email: z.string().trim().min(1, "Email is required").email("Enter a valid email address").max(100, "Email must be at most 100 characters"),
    salutation: optionalStringMaxSchema(50),
    phone: optionalStringMaxSchema(20),
    alternate_phone: optionalStringMaxSchema(20),
    opening_balance: optionalNumberSchema,
    credit_limit: optionalNumberSchema,
    website: optionalStringMaxSchema(255),
    // ── Address (optional). Persisted by the backend store endpoint when
    // address_line_1 + country + state are provided. ──
    address_line_1: optionalStringMaxSchema(255),
    address_line_2: optionalStringMaxSchema(255),
    city: optionalStringMaxSchema(100),
    zip_code: optionalStringMaxSchema(20),
    country: relationFieldSchema,
    state: relationFieldSchema,
})

type VendorFormValues = z.infer<typeof vendorFormSchema>

export { vendorFormSchema }
export type { VendorFormValues }