import { X } from "lucide-react";
import { type ReactNode, useEffect, useId, useRef } from "react";

interface ConfirmDialogProps {
  open: boolean;
  title: string;
  description: ReactNode;
  confirmLabel: string;
  danger?: boolean;
  busy?: boolean;
  onConfirm: () => void;
  onCancel: () => void;
  children?: ReactNode;
}

export function ConfirmDialog({ open, title, description, confirmLabel, danger, busy, onConfirm, onCancel, children }: ConfirmDialogProps) {
  const titleId = useId();
  const descriptionId = useId();
  const panelRef = useDialogLifecycle(open, onCancel, !busy);
  if (!open) {
    return null;
  }
  return (
    <div className="confirm-backdrop" role="presentation" onClick={() => !busy && onCancel()}>
      <div
        ref={panelRef}
        className="confirm-panel"
        role="dialog"
        aria-modal="true"
        aria-labelledby={titleId}
        aria-describedby={descriptionId}
        aria-busy={busy}
        onClick={(event) => event.stopPropagation()}
      >
        <div className="panel-header dialog-panel-header">
          <h2 id={titleId}>{title}</h2>
          <button type="button" className="theme-upload drawer-close" aria-label={`关闭${title}`} onClick={onCancel} disabled={busy}>
            <X size={14} />
            <span>关闭</span>
          </button>
        </div>
        <p id={descriptionId}>{description}</p>
        {children}
        <div className="confirm-actions">
          <button type="button" onClick={onCancel} disabled={busy}>
            取消
          </button>
          <button type="button" className={danger ? "confirm-danger" : "confirm-primary"} onClick={onConfirm} disabled={busy}>
            {busy ? "提交中…" : confirmLabel}
          </button>
        </div>
      </div>
    </div>
  );
}

interface ManagementDialogProps {
  open: boolean;
  title: string;
  description?: ReactNode;
  wide?: boolean;
  onClose: () => void;
  children: ReactNode;
}

export function ManagementDialog({ open, title, description, wide, onClose, children }: ManagementDialogProps) {
  const titleId = useId();
  const descriptionId = useId();
  const panelRef = useDialogLifecycle(open, onClose, true);
  if (!open) {
    return null;
  }
  return (
    <div className="confirm-backdrop management-dialog-backdrop" role="presentation" onClick={onClose}>
      <div
        ref={panelRef}
        className={`drawer-panel management-dialog-panel${wide ? " management-dialog-wide" : ""}`}
        role="dialog"
        aria-modal="true"
        aria-labelledby={titleId}
        aria-describedby={description ? descriptionId : undefined}
        onClick={(event) => event.stopPropagation()}
      >
        <div className="panel-header dialog-panel-header">
          <h2 id={titleId}>{title}</h2>
          <button type="button" className="theme-upload drawer-close" aria-label={`关闭${title}`} onClick={onClose}>
            <X size={14} />
            <span>关闭</span>
          </button>
        </div>
        {description && <p id={descriptionId} className="dialog-description">{description}</p>}
        {children}
      </div>
    </div>
  );
}

function useDialogLifecycle(open: boolean, onClose: () => void, canClose: boolean) {
  const panelRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    if (!open) {
      return;
    }
    const previousFocus = document.activeElement instanceof HTMLElement ? document.activeElement : null;
    const panel = panelRef.current;
    const focusTarget = panel?.querySelector<HTMLElement>("button:not([disabled]), input:not([disabled]), select:not([disabled]), textarea:not([disabled])");
    focusTarget?.focus();

    function handleKeyDown(event: KeyboardEvent) {
      if (event.key === "Escape" && canClose) {
        event.preventDefault();
        onClose();
      }
    }

    document.addEventListener("keydown", handleKeyDown);
    const previousBodyOverflow = document.body.style.overflow;
    document.body.style.overflow = "hidden";
    return () => {
      document.removeEventListener("keydown", handleKeyDown);
      document.body.style.overflow = previousBodyOverflow;
      previousFocus?.focus();
    };
  }, [canClose, onClose, open]);

  return panelRef;
}

interface UsageMeterProps {
  label: string;
  percent?: number;
}

export function UsageMeter({ label, percent }: UsageMeterProps) {
  const known = typeof percent === "number" && Number.isFinite(percent);
  const clamped = known ? Math.max(0, Math.min(100, percent)) : 0;
  return (
    <div className="usage-meter">
      <span>{label}</span>
      <span className="usage-meter-track" role="img" aria-label={known ? `${label} ${Math.round(clamped)}%` : `${label} 暂无数据`}>
        {known && <span className={`usage-meter-fill${clamped >= 85 ? " usage-high" : ""}`} style={{ width: `${clamped}%` }} />}
      </span>
      <span className="usage-meter-value">{known ? `${Math.round(clamped)}%` : "--"}</span>
    </div>
  );
}

interface DiffViewProps {
  lines: Array<{ kind: "same" | "added" | "removed"; text: string }>;
}

export function DiffView({ lines }: DiffViewProps) {
  return (
    <div className="diff-view" role="figure" aria-label="配置变更对比">
      {lines.map((line, index) => (
        <span key={`${index}-${line.text}`} className={`diff-line diff-line-${line.kind}`}>
          <span aria-hidden="true">{line.kind === "added" ? "+" : line.kind === "removed" ? "-" : " "}</span>
          <span>{line.text || " "}</span>
        </span>
      ))}
    </div>
  );
}