"use client";

import { cn } from "@/lib/utils";

type LoadingStateProps = {
  message?: string;
  size?: "sm" | "md" | "lg";
  className?: string;
};

export function LoadingState({
  message = "Loading...",
  size = "md",
  className,
}: LoadingStateProps) {
  const sizeClasses = {
    sm: "h-6 w-6 border-2",
    md: "h-8 w-8 border-2",
    lg: "h-12 w-12 border-3",
  };

  return (
    <div
      className={cn(
        "flex flex-col items-center justify-center gap-4 p-8",
        className,
      )}
      aria-live="polite"
      aria-busy="true"
    >
      <div
        className={cn(
          "animate-spin rounded-full border-current border-t-transparent",
          sizeClasses[size],
        )}
        role="status"
        aria-label="Loading"
      />
      {message && (
        <p className="text-[14px] text-[var(--text-secondary)] loading-message">
          {message}
        </p>
      )}
    </div>
  );
}

type SkeletonProps = {
  variant?: "text" | "card" | "circle" | "rect";
  width?: string | number;
  height?: string | number;
  lines?: number;
  className?: string;
};

export function Skeleton({
  variant = "rect",
  width,
  height,
  lines = 1,
  className,
}: SkeletonProps) {
  const baseClasses = "skeleton";
  
  const variantClasses = {
    text: "rounded-md",
    card: "rounded-lg",
    circle: "rounded-full",
    rect: "rounded-sm",
  };

  const style = {
    width: width || (variant === "text" ? "100%" : "120px"),
    height: height || (variant === "text" ? "1em" : variant === "circle" ? width || "40px" : "80px"),
  };

  if (variant === "text" && lines > 1) {
    return (
      <div className={cn("flex flex-col gap-2", className)}>
        {Array.from({ length: lines }).map((_, i) => (
          <div
            key={i}
            className={cn(baseClasses, variantClasses[variant])}
            style={{
              width: width || (i === lines - 1 ? "70%" : "100%"),
              height: height || "1em",
            }}
          />
        ))}
      </div>
    );
  }

  return (
    <div
      className={cn(baseClasses, variantClasses[variant], className)}
      style={style}
      aria-hidden="true"
    />
  );
}

type PageLoadingProps = {
  message?: string;
  subtitle?: string;
};

export function PageLoading({ message, subtitle }: PageLoadingProps) {
  return (
    <div className="flex min-h-[400px] flex-1 items-center justify-center">
      <LoadingState message={message || "Loading..."} size="lg" />
      {subtitle && (
        <p className="mt-2 text-center text-[13px] text-[var(--text-muted)]">
          {subtitle}
        </p>
      )}
    </div>
  );
}

type InlineLoadingProps = {
  text?: string;
  size?: "sm" | "md" | "lg";
  className?: string;
};

export function InlineLoading({
  text = "Loading...",
  size = "sm",
  className,
}: InlineLoadingProps) {
  return (
    <div
      className={cn(
        "flex items-center gap-2 text-[var(--text-secondary)]",
        className,
      )}
    >
      <span
        className={cn(
          "animate-spin rounded-full border-current border-t-transparent",
          size === "sm" && "h-3 w-3 border-2",
          size === "md" && "h-4 w-4 border-2",
          size === "lg" && "h-5 w-5 border-2",
        )}
      />
      <span className="text-[12px] sm:text-[13px]">{text}</span>
    </div>
  );
}

type CardSkeletonProps = {
  lines?: number;
  withImage?: boolean;
  className?: string;
};

export function CardSkeleton({
  lines = 3,
  withImage = false,
  className,
}: CardSkeletonProps) {
  return (
    <div
      className={cn(
        "workspace-card overflow-hidden p-4",
        className,
      )}
    >
      {withImage && (
        <Skeleton variant="rect" width="100%" height={120} className="mb-4" />
      )}
      <Skeleton variant="text" width="60%" className="mb-2" />
      <Skeleton variant="text" width="100%" lines={lines} />
    </div>
  );
}