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"use client";

import { api } from "@/lib/api";
import { useChatStore } from "@/lib/chatStore";
import { useQuery } from "@tanstack/react-query";
import clsx from "clsx";
import { useEffect } from "react";
import ReactMarkdown from "react-markdown";

/**
 * View-source drawer. Shown when the user clicks a source chip or an inline
 * citation. Renders the full markdown of a doc, plus the option to "Pin this
 * source" — which scopes follow-up questions to that doc via /ask.
 */
export function SourceDrawer({
  open,
  docId,
  docName,
  onClose,
}: {
  open: boolean;
  docId: string | null;
  docName?: string | null;
  onClose: () => void;
}) {
  const activeId = useChatStore((s) => s.activeId);
  const conv = useChatStore((s) => (s.activeId ? s.conversations[s.activeId] : null));
  const pinDoc = useChatStore((s) => s.pinDoc);
  const newConversationPinned = useChatStore((s) => s.newConversationPinned);

  const { data, isLoading, error } = useQuery({
    queryKey: ["doc-content", docId],
    queryFn: () => api.getDocumentContent(docId as string),
    enabled: open && !!docId,
    staleTime: 60_000,
  });

  // ESC to close
  useEffect(() => {
    if (!open) return;
    const onKey = (e: KeyboardEvent) => {
      if (e.key === "Escape") onClose();
    };
    window.addEventListener("keydown", onKey);
    return () => window.removeEventListener("keydown", onKey);
  }, [open, onClose]);

  const isPinned = conv?.pinnedDocId === docId;
  const cleanName = (n: string | null | undefined) =>
    (n ?? "").replace(/_\d{6,}$/, "");
  const displayName = data?.name ? cleanName(data.name) : cleanName(docName);

  const handlePin = () => {
    if (!docId || !activeId) return;
    if (isPinned) pinDoc(activeId, null, null);
    else pinDoc(activeId, docId, data?.name ?? docName ?? null);
  };

  const handleNewScoped = () => {
    if (!docId) return;
    newConversationPinned(docId, data?.name ?? docName ?? "");
    onClose();
  };

  return (
    <>
      {/* Scrim */}
      <div
        className={clsx(
          "fixed inset-0 z-40 bg-canvas-deep/60 backdrop-blur-sm transition-opacity duration-300",
          open ? "opacity-100" : "opacity-0 pointer-events-none"
        )}
        onClick={onClose}
        aria-hidden
      />
      <aside
        className={clsx(
          "fixed top-0 right-0 z-50 h-screen w-full sm:w-[560px] glass-strong",
          "flex flex-col transition-transform duration-300 ease-atelier",
          open ? "translate-x-0" : "translate-x-full"
        )}
        role="dialog"
        aria-modal="true"
        aria-label="Source document"
      >
        {/* Header */}
        <header className="px-6 py-5 border-b border-glass-border">
          <div className="flex items-start justify-between gap-3">
            <div className="min-w-0 flex-1">
              <div className="text-micro uppercase tracking-[0.16em] text-ink-50 font-mono mb-1">
                Source · view
              </div>
              <h2
                className="text-display-sm text-ink truncate"
                title={displayName ?? ""}
              >
                {displayName || "Loading…"}
              </h2>
              {docId && (
                <div className="text-micro font-mono text-ink-50 mt-0.5 truncate">
                  {docId}
                </div>
              )}
            </div>
            <button
              onClick={onClose}
              className="shrink-0 p-2 rounded-md text-ink-50 hover:text-ink hover:bg-glass transition-colors"
              aria-label="Close"
            >
              <svg width="14" height="14" viewBox="0 0 14 14" fill="none">
                <path
                  d="m3 3 8 8M11 3l-8 8"
                  stroke="currentColor"
                  strokeWidth="1.5"
                  strokeLinecap="round"
                />
              </svg>
            </button>
          </div>

          {/* Pin / scope actions */}
          <div className="mt-4 flex flex-wrap items-center gap-2">
            <button
              onClick={handlePin}
              disabled={!activeId || !docId}
              className={clsx(
                "text-caption px-3 py-1.5 rounded-pill transition-colors disabled:opacity-40",
                isPinned
                  ? "bg-amber text-canvas hover:bg-amber-soft"
                  : "bg-glass text-ink hover:bg-glass-stronger"
              )}
              style={
                isPinned
                  ? undefined
                  : { boxShadow: "0 0 0 1px rgba(255,255,255,0.10)" }
              }
              title={
                isPinned
                  ? "Currently pinnedclick to unpin"
                  : "Pin: future questions in this conversation will use only this doc"
              }
            >
              {isPinned ? "✓ Pinned to this conversation" : "Pin to this conversation"}
            </button>
            <button
              onClick={handleNewScoped}
              disabled={!docId}
              className="text-caption px-3 py-1.5 rounded-pill bg-glass text-ink hover:bg-glass-stronger transition-colors disabled:opacity-40"
              style={{ boxShadow: "0 0 0 1px rgba(255,255,255,0.10)" }}
              title="Open a new conversation scoped to this doc"
            >
              New scoped conversation →
            </button>
          </div>
        </header>

        {/* Body */}
        <div className="flex-1 overflow-y-auto px-6 py-5">
          {isLoading && (
            <div className="text-ink-50 text-shimmer">Loading source…</div>
          )}
          {error && (
            <div
              className="p-4 rounded-md"
              style={{
                background: "rgba(255, 122, 122, 0.06)",
                boxShadow: "0 0 0 1px rgba(255, 122, 122, 0.28)",
              }}
            >
              <div className="text-caption-strong text-status-err">
                Couldn&apos;t load source
              </div>
              <div className="text-caption text-ink-70 mt-1">
                {error instanceof Error ? error.message : String(error)}
              </div>
            </div>
          )}
          {data && (
            <article className="markdown-body text-ink leading-[1.7]">
              <ReactMarkdown
                components={{
                  p: ({ children }) => <p className="mb-3 last:mb-0">{children}</p>,
                  h1: ({ children }) => (
                    <h2 className="text-display-md text-ink mt-6 mb-3">{children}</h2>
                  ),
                  h2: ({ children }) => (
                    <h3 className="text-display-sm text-ink mt-5 mb-2.5">{children}</h3>
                  ),
                  h3: ({ children }) => (
                    <h4 className="text-body-strong text-ink mt-4 mb-2">{children}</h4>
                  ),
                  ul: ({ children }) => (
                    <ul className="list-disc pl-5 mb-3 space-y-1 marker:text-amber/70">
                      {children}
                    </ul>
                  ),
                  ol: ({ children }) => (
                    <ol className="list-decimal pl-5 mb-3 space-y-1 marker:text-amber/70 marker:font-mono">
                      {children}
                    </ol>
                  ),
                  strong: ({ children }) => (
                    <strong className="font-semibold text-ink">{children}</strong>
                  ),
                  em: ({ children }) => (
                    <em className="serif-italic text-amber-soft">{children}</em>
                  ),
                  code: ({ children }) => (
                    <code
                      className="font-mono text-amber px-1.5 py-0.5 rounded text-[0.92em]"
                      style={{ background: "rgba(255,181,69,0.10)" }}
                    >
                      {children}
                    </code>
                  ),
                  pre: ({ children }) => (
                    <pre
                      className="font-mono text-caption p-3 rounded-md overflow-x-auto my-3"
                      style={{
                        background: "rgba(0,0,0,0.28)",
                        boxShadow: "0 0 0 1px rgba(255,255,255,0.06)",
                      }}
                    >
                      {children}
                    </pre>
                  ),
                  a: ({ href, children }) => (
                    <a
                      href={href}
                      className="text-amber underline decoration-amber/40 hover:decoration-amber"
                      target="_blank"
                      rel="noopener noreferrer"
                    >
                      {children}
                    </a>
                  ),
                  hr: () => <hr className="my-5 border-0 h-px bg-glass-border" />,
                  blockquote: ({ children }) => (
                    <blockquote className="border-l-2 border-amber/50 pl-4 my-3 text-ink-70 serif-italic">
                      {children}
                    </blockquote>
                  ),
                }}
              >
                {data.text}
              </ReactMarkdown>
            </article>
          )}
        </div>

        {data && (
          <footer className="px-6 py-3 border-t border-glass-border text-micro font-mono uppercase tracking-[0.12em] text-ink-50">
            {data.length_chars.toLocaleString()} chars
            {data.created_at
              ? ` · ${new Date(data.created_at * 1000).toLocaleDateString()}`
              : ""}
          </footer>
        )}
      </aside>
    </>
  );
}