/**
 * @file FileViewer.tsx
 * @description Read-only file-content modal for the config explorer. Takes
 * already-fetched data as props (path/data/error) rather than fetching
 * itself, so it stays tool-agnostic — the orchestrator (Claude or Codex
 * config page) owns the fetch. A markdown file gets a Raw / Preview switch
 * (`MarkdownPreview`); Raw is the default.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { useRef, useState } from "react";
import { useDialog } from "../../hooks/useDialog";
import { useTranslation } from "react-i18next";
import { FileText, X, AlertCircle, Eye, Code2 } from "lucide-react";
import type { CcFileResponse } from "../../lib/api";
import { CopyButton } from "./configPrimitives";
import { MarkdownPreview, isMarkdown } from "../MarkdownPreview";

export function FileViewer({
  state,
  onClose,
}: {
  state: { path: string; data: CcFileResponse | null; error: string | null };
  onClose: () => void;
}) {
  const { t } = useTranslation("ccConfig");
  const [preview, setPreview] = useState(false);
  const canPreview = isMarkdown(state.path) && !!state.data;
  const panelRef = useRef<HTMLDivElement>(null);
  useDialog(true, panelRef, onClose);
  return (
    <div
      className="fixed inset-0 bg-surface-0/70 z-50 flex items-center justify-center p-4"
      onClick={onClose}
    >
      <div
        ref={panelRef}
        role="dialog"
        aria-modal="true"
        aria-labelledby="cc-file-viewer-title"
        className="relative w-full max-w-4xl max-h-[85vh] rounded-xl border border-border bg-surface-1 flex flex-col"
        onClick={(e) => e.stopPropagation()}
      >
        <div className="flex items-center gap-2 border-b border-border px-4 py-2.5">
          <FileText className="w-4 h-4 text-fg-muted" />
          <span
            id="cc-file-viewer-title"
            className="font-mono text-[12px] text-fg-secondary truncate flex-1"
          >
            {state.path}
          </span>
          {canPreview && (
            <button
              type="button"
              aria-pressed={preview}
              onClick={() => setPreview((v) => !v)}
              className="inline-flex items-center gap-1 rounded-md border border-border px-2 py-0.5 text-[11px] text-fg-secondary hover:bg-surface-3 hover:text-fg-primary"
            >
              {preview ? <Code2 className="h-3 w-3" /> : <Eye className="h-3 w-3" />}
              {preview ? t("common.raw") : t("common.preview")}
            </button>
          )}
          <CopyButton value={state.path} />
          <button
            type="button"
            onClick={onClose}
            className="text-fg-secondary hover:text-fg-primary p-1 rounded-md hover:bg-surface-3"
            aria-label={t("common.close")}
          >
            <X className="w-4 h-4" />
          </button>
        </div>
        <div className="overflow-auto p-4">
          {state.error ? (
            <div className="text-sm text-status-danger inline-flex items-center gap-2">
              <AlertCircle className="w-4 h-4" />
              {state.error}
            </div>
          ) : !state.data ? (
            <div className="text-sm text-fg-muted">…</div>
          ) : preview && canPreview ? (
            <>
              <MarkdownPreview text={state.data.text} />
              {state.data.truncated && (
                <p className="text-[11px] text-fg-muted italic">{t("common.truncated")}</p>
              )}
            </>
          ) : (
            <pre className="text-[11px] font-mono text-fg-secondary whitespace-pre-wrap break-words">
              {state.data.text}
              {state.data.truncated && (
                <span className="text-fg-muted italic">
                  {"\n\n"}
                  {t("common.truncated")}
                </span>
              )}
            </pre>
          )}
        </div>
      </div>
    </div>
  );
}