"use client";

import {
  type ButtonHTMLAttributes,
  type InputHTMLAttributes,
  type ReactNode,
  type SelectHTMLAttributes,
  type TextareaHTMLAttributes,
  useEffect,
} from "react";
import { cn, toFa } from "@/lib/utils";
import { CloseIcon, SpinnerIcon } from "./icons";

/* ------------------------------- Button -------------------------------- */
type ButtonVariant = "primary" | "secondary" | "danger" | "ghost";
interface ButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
  variant?: ButtonVariant;
  loading?: boolean;
  icon?: ReactNode;
}

const buttonVariants: Record<ButtonVariant, string> = {
  primary: "bg-primary text-white hover:bg-primary-hover",
  secondary:
    "bg-surface-muted text-foreground hover:bg-surface-hover border border-border",
  danger: "bg-danger text-white hover:opacity-90",
  ghost: "text-muted hover:bg-surface-muted",
};

export function Button({
  variant = "primary",
  loading,
  icon,
  className,
  children,
  disabled,
  ...props
}: ButtonProps) {
  return (
    <button
      className={cn(
        "inline-flex items-center justify-center gap-2 rounded-xl px-4 py-2 text-sm font-medium transition disabled:cursor-not-allowed disabled:opacity-60",
        buttonVariants[variant],
        className,
      )}
      disabled={disabled || loading}
      {...props}
    >
      {loading ? <SpinnerIcon className="h-4 w-4" /> : icon}
      {children}
    </button>
  );
}

/* ------------------------------- Fields -------------------------------- */
export function Field({
  label,
  hint,
  required,
  children,
}: {
  label: string;
  hint?: string;
  required?: boolean;
  children: ReactNode;
}) {
  return (
    <label className="flex flex-col gap-1.5 text-sm">
      <span className="font-medium text-foreground">
        {label}
        {required && <span className="text-danger"> *</span>}
      </span>
      {children}
      {hint && <span className="text-xs text-muted">{hint}</span>}
    </label>
  );
}

const fieldClass =
  "w-full rounded-xl border border-border bg-surface px-3 py-2 text-sm outline-none transition focus:border-primary focus:ring-4 focus:ring-[var(--ring)] disabled:opacity-60";

export function Input(props: InputHTMLAttributes<HTMLInputElement>) {
  return <input {...props} className={cn(fieldClass, props.className)} />;
}

export function Textarea(props: TextareaHTMLAttributes<HTMLTextAreaElement>) {
  return (
    <textarea
      rows={3}
      {...props}
      className={cn(fieldClass, "resize-y", props.className)}
    />
  );
}

export function Select(props: SelectHTMLAttributes<HTMLSelectElement>) {
  return <select {...props} className={cn(fieldClass, props.className)} />;
}

export function Switch({
  checked,
  onChange,
  label,
}: {
  checked: boolean;
  onChange: (v: boolean) => void;
  label?: string;
}) {
  return (
    <button
      type="button"
      onClick={() => onChange(!checked)}
      className="inline-flex items-center gap-2 text-sm"
    >
      <span
        className={cn(
          "relative h-6 w-11 rounded-full transition",
          checked ? "bg-primary" : "bg-[var(--switch-off)]",
        )}
      >
        <span
          className={cn(
            "absolute top-0.5 h-5 w-5 rounded-full bg-white transition-all",
            checked ? "left-0.5" : "right-0.5",
          )}
        />
      </span>
      {label}
    </button>
  );
}

/* ----------------------------- Containers ------------------------------ */
export function Card({
  className,
  children,
}: {
  className?: string;
  children: ReactNode;
}) {
  return (
    <div
      className={cn(
        "rounded-2xl border border-border bg-surface p-5 shadow-sm",
        className,
      )}
    >
      {children}
    </div>
  );
}

export function PageHeader({
  title,
  subtitle,
  action,
}: {
  title: string;
  subtitle?: string;
  action?: ReactNode;
}) {
  return (
    <div className="mb-6 flex flex-wrap items-center justify-between gap-3">
      <div>
        <h1 className="text-xl font-bold text-foreground">{title}</h1>
        {subtitle && <p className="mt-1 text-sm text-muted">{subtitle}</p>}
      </div>
      {action}
    </div>
  );
}

export function Badge({
  children,
  tone = "neutral",
}: {
  children: ReactNode;
  tone?: "neutral" | "success" | "danger" | "primary";
}) {
  return (
    <span
      className={cn(
        "inline-flex items-center rounded-full px-2.5 py-0.5 text-xs font-medium",
        tone === "neutral" && "bg-surface-muted text-muted",
        tone === "success" && "bg-success/15 text-success",
        tone === "danger" && "bg-danger/15 text-danger",
        tone === "primary" && "bg-primary-soft text-primary",
      )}
    >
      {children}
    </span>
  );
}

export function Pagination({
  page,
  lastPage,
  total,
  onChange,
}: {
  page: number;
  lastPage: number;
  total?: number;
  onChange: (p: number) => void;
}) {
  if (lastPage <= 1) return null;
  return (
    <div className="mt-4 flex items-center justify-between gap-3 text-sm">
      <span className="text-muted">
        {total != null && `${toFa(total)} مورد · `}
        صفحه {toFa(page)} از {toFa(lastPage)}
      </span>
      <div className="flex items-center gap-2">
        <Button
          variant="secondary"
          onClick={() => onChange(page - 1)}
          disabled={page <= 1}
        >
          قبلی
        </Button>
        <Button
          variant="secondary"
          onClick={() => onChange(page + 1)}
          disabled={page >= lastPage}
        >
          بعدی
        </Button>
      </div>
    </div>
  );
}

export function EmptyState({
  title,
  message,
  icon,
  action,
}: {
  title?: string;
  message: string;
  icon?: ReactNode;
  action?: ReactNode;
}) {
  return (
    <div className="flex flex-col items-center justify-center gap-3 py-16 text-center">
      <span className="flex h-16 w-16 items-center justify-center rounded-2xl bg-surface-muted text-3xl">
        {icon ?? "🌙"}
      </span>
      {title && <p className="font-semibold text-foreground">{title}</p>}
      <p className="max-w-sm text-sm text-muted">{message}</p>
      {action && <div className="mt-1">{action}</div>}
    </div>
  );
}

export function Spinner({ className }: { className?: string }) {
  return <SpinnerIcon className={cn("h-6 w-6 text-primary", className)} />;
}

/* ------------------------------- Modal --------------------------------- */
export function Modal({
  open,
  onClose,
  title,
  children,
  footer,
}: {
  open: boolean;
  onClose: () => void;
  title: string;
  children: ReactNode;
  footer?: ReactNode;
}) {
  useEffect(() => {
    if (!open) return;
    const onKey = (e: KeyboardEvent) => e.key === "Escape" && onClose();
    document.addEventListener("keydown", onKey);
    return () => document.removeEventListener("keydown", onKey);
  }, [open, onClose]);

  if (!open) return null;
  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center p-4">
      <div
        className="absolute inset-0 bg-black/40 backdrop-blur-sm"
        onClick={onClose}
      />
      <div className="relative z-10 flex max-h-[90vh] w-full max-w-lg flex-col overflow-hidden rounded-2xl bg-surface shadow-xl">
        <div className="flex items-center justify-between border-b border-border px-5 py-4">
          <h2 className="font-bold text-foreground">{title}</h2>
          <button
            onClick={onClose}
            className="rounded-lg p-1 text-muted hover:bg-surface-muted"
            aria-label="بستن"
          >
            <CloseIcon className="h-5 w-5" />
          </button>
        </div>
        <div className="overflow-y-auto px-5 py-4">{children}</div>
        {footer && (
          <div className="flex justify-end gap-2 border-t border-border px-5 py-4">
            {footer}
          </div>
        )}
      </div>
    </div>
  );
}

export function ConfirmDialog({
  open,
  title = "حذف مورد",
  message,
  confirmText = "حذف",
  loading,
  onConfirm,
  onClose,
}: {
  open: boolean;
  title?: string;
  message: string;
  confirmText?: string;
  loading?: boolean;
  onConfirm: () => void;
  onClose: () => void;
}) {
  return (
    <Modal
      open={open}
      onClose={onClose}
      title={title}
      footer={
        <>
          <Button variant="secondary" onClick={onClose}>
            انصراف
          </Button>
          <Button variant="danger" loading={loading} onClick={onConfirm}>
            {confirmText}
          </Button>
        </>
      }
    >
      <p className="text-sm text-foreground">{message}</p>
    </Modal>
  );
}