import { TextAttachmentContext } from "@/context/TextAttachmentContext";
import { isTextAttachment } from "@/lib/issue-attachments";
import { ArtifactPreview } from "@/components/artifacts/ArtifactCard";
import { isVideoLikeOutput } from "@/lib/issue-output";
import { AgentAvatar, type AvatarAgent } from "../AgentAvatar";
import { Identity } from "../Identity";
import { paperclipHumanAvatarUrl } from "@/lib/issue-chat-human-author";
import { useCallback, useContext, useState, type ReactNode } from "react";
import { useEmailComment } from "@/components/EmailMessageCard";
import type { IssueAttachment } from "@paperclipai/shared";
import { IssueGalleryContext } from "@/context/IssueGalleryContext";
import { cn } from "@/lib/utils";
import { useStreamlinedTaskChatPresentation } from "./presentation-mode";
import { MarkdownBody } from "@/components/MarkdownBody";
import {
  ImageGalleryModal,
  type GalleryMediaItem,
} from "@/components/ImageGalleryModal";
import {
  Attachment,
  AttachmentContent,
  AttachmentDescription,
  AttachmentGroup,
  AttachmentMedia,
  AttachmentTitle,
  AttachmentTrigger,
} from "@/components/ui/attachment";
import {
  extractAttachmentRefs,
  extractImageRefs,
  fileKindForAttachment,
  formatFileSize,
  hydrateAttachmentRefs,
  isImageAttachment,
  stripStandaloneImageEmbeds,
  type AttachmentRef,
} from "./task-chat-attachments";
import { TaskChatSystemNotice } from "./TaskChatSystemNotice";
import type { TaskChatMessageItem } from "./task-chat-model";

interface TaskChatBubbleProps {
  item: TaskChatMessageItem;
  /** Requeues a blocked task after a no-live-execution-path recovery notice. */
  onTryAgainNoLiveExecutionPath?: () => Promise<void> | void;
  tryAgainNoLiveExecutionPathPending?: boolean;
  /** Disable the entrance animation when replacing an already-visible live response. */
  animateEntry?: boolean;
  /** Action shown beside the queued state for an interruptible message. */
  queuedAction?: ReactNode;
  /**
   * The settled run turn rendered on this bubble's footer line (round 9):
   * replaces the plain timestamp with "2:34 PM · ✓ Worked · 38s · 3 tools"
   * (the timestamp leads the summary), expandable to the nested tool history.
   * Supplied by TaskChatThreadView when `item.attachedTurn` is set.
   */
  attachedTurn?: ReactNode;
  /** New-runner Worked header, rendered above the durable final response. */
  beforeTurn?: ReactNode;
  /** The durable runner turn already owns the shared agent identity row. */
  hideAgentIdentity?: boolean;
  /**
   * copy · 👍 · 👎 controls for an agent bubble's footer line (PAP-413).
   * Rendered here only for a runless reply (leading the bare timestamp); when
   * an attached turn is present it owns these via its `leading` slot instead,
   * so this bubble skips them. Human/system bubbles pass nothing.
   */
  actions?: ReactNode;
  attachments?: IssueAttachment[];
}

function initialsForName(name: string) {
  const parts = name.trim().split(/\s+/);
  if (parts.length >= 2) {
    return (parts[0][0] + parts[parts.length - 1][0]).toUpperCase();
  }
  return name.slice(0, 2).toUpperCase();
}

export function TaskChatAgentIdentity({
  agentName,
  agentIcon,
  agent,
}: {
  agentName: string;
  agentIcon?: string | null;
  agent?: AvatarAgent;
}) {
  return (
    <span
      className="flex items-center gap-2 px-1"
      data-testid="task-chat-agent-identity"
    >
      <span data-testid="task-chat-agent-avatar"><AgentAvatar agent={agent} name={agentName} size={24} /></span>
      <span className="text-sm font-semibold text-foreground">{agentName}</span>
    </span>
  );
}

/**
 * Viewer-relative message row — the primary legibility signal. Own messages sit
 * right in a solid accent bubble; agents and other humans sit on the left
 * directly on the page surface with their own avatar and name;
 * system notices are centered and recede.
 */
function galleryItemForMedia(
  src: string,
  name?: string,
  attachment?: ReturnType<typeof hydrateAttachmentRefs>[number],
): GalleryMediaItem {
  return {
    id: attachment?.id ?? src,
    contentPath: attachment?.openPath ?? src,
    openPath: attachment?.openPath,
    downloadPath: attachment?.downloadPath,
    contentType: attachment?.contentType ?? "",
    originalFilename: name?.trim() ? name : "image",
  };
}

function uniqueAttachmentRefs(refs: AttachmentRef[]): AttachmentRef[] {
  return refs.filter(
    (ref, index) =>
      refs.findIndex(
        (candidate) =>
          (ref.id && candidate.id === ref.id) || candidate.url === ref.url,
      ) === index,
  );
}

export function TaskChatBubble(props: TaskChatBubbleProps) {
  const email = useEmailComment(props.item.id);
  return email ?? <TaskChatBubbleContent {...props} />;
}
function TaskChatBubbleContent({
  item,
  animateEntry = true,
  queuedAction,
  attachedTurn,
  beforeTurn,
  hideAgentIdentity = false,
  actions,
  attachments = [],
  onTryAgainNoLiveExecutionPath,
  tryAgainNoLiveExecutionPathPending,
}: TaskChatBubbleProps) {
  const streamlined = useStreamlinedTaskChatPresentation();
  const openText = useContext(TextAttachmentContext);
  // Task attachments share the page gallery; standalone images retain the bubble viewer.
  const openIssueGallery = useContext(IssueGalleryContext);
  const [lightboxSrc, setLightboxSrc] = useState<string | null>(null);
  // Keep MarkdownBody's memo boundary intact when only the live tail changes.
  // A fresh callback here reparses every historical response on every update.
  const openImage = useCallback((src: string) => {
    if (!openIssueGallery?.(src)) setLightboxSrc(src);
  }, [openIssueGallery]);
  if (item.interstitial) {
    // Interstitial updates are ephemeral (PAP-361): while streaming the text
    // lives on the live parent row's line (TaskChatStatusItem.selfTalk), and
    // once finished it renders nowhere — the run log / classic transcript
    // remain the archive. Never rendered as a bubble.
    return null;
  }

  if (item.author === "system") {
    // Collapsed humanized one-liner, expandable to the full detail (PAP-443).
    return (
      <TaskChatSystemNotice
        item={item}
        onTryAgainNoLiveExecutionPath={onTryAgainNoLiveExecutionPath}
        tryAgainNoLiveExecutionPathPending={tryAgainNoLiveExecutionPathPending}
      />
    );
  }

  const isHuman = item.author === "human";
  const isOwnMessage = isHuman && item.isCurrentUser === true;
  const sentFromIMessage = isHuman && item.sourceChannel === "imessage-photon";
  // Non-image file references ("[name](/api/attachments/…/content)") render as
  // attachment chips under the bubble; link-only lines leave the body text.
  const { refs: linkedRefs, text: bodyWithoutAttachmentLinks } =
    extractAttachmentRefs(item.text);
  const embeddedImageRefs = extractImageRefs(bodyWithoutAttachmentLinks);
  const bodyText = stripStandaloneImageEmbeds(bodyWithoutAttachmentLinks);
  const hydratedLinkedRefs = hydrateAttachmentRefs(linkedRefs, attachments);
  const hydratedEmbeddedRefs = hydrateAttachmentRefs(
    embeddedImageRefs,
    attachments,
  );
  const boundAttachmentRefs: AttachmentRef[] = attachments
    .filter((attachment) => attachment.issueCommentId === item.id)
    .map((attachment) => ({
      id: attachment.id,
      name: attachment.originalFilename?.trim() || "attachment",
      url: attachment.contentPath,
      contentType: attachment.contentType,
      byteSize: attachment.byteSize,
      openPath: attachment.openPath,
      downloadPath: attachment.downloadPath,
    }));
  const imageRefs = uniqueAttachmentRefs([
    ...hydratedEmbeddedRefs,
    ...hydratedLinkedRefs.filter(isImageAttachment),
    ...boundAttachmentRefs.filter(isImageAttachment),
  ]);
  const attachmentRefs = uniqueAttachmentRefs([
    ...hydratedLinkedRefs.filter((ref) => !isImageAttachment(ref)),
    ...boundAttachmentRefs.filter((ref) => !isImageAttachment(ref)),
  ]);
  const mediaRefs = [...imageRefs, ...attachmentRefs.filter((ref) => isVideoLikeOutput(ref.contentType, ref.name))];
  const galleryItems: GalleryMediaItem[] =
    lightboxSrc !== null && !mediaRefs.some((ref) => ref.url === lightboxSrc)
      ? // A clicked image the extractor missed (e.g. inline HTML) still gets a
        // single-item lightbox rather than nothing.
        [galleryItemForMedia(lightboxSrc)]
      : mediaRefs.map((ref) => galleryItemForMedia(ref.url, ref.name, ref));
  const lightboxIndex =
    lightboxSrc === null
      ? -1
      : Math.max(0, mediaRefs.findIndex((ref) => ref.url === lightboxSrc));
  return (
    <div
      className={cn(
        "flex w-full flex-col gap-1",
        animateEntry && "tc-enter-bubble",
        isOwnMessage ? "items-end" : "items-start",
      )}
    >
      {beforeTurn ? <div className="w-full pb-1">{beforeTurn}</div> : null}
      {isHuman && !item.isCurrentUser && item.authorName ? (
        <span className="px-1 text-sm font-semibold text-foreground" data-testid="task-chat-human-identity" data-author-user-id={item.authorUserId}>
          <Identity name={item.authorName} avatarUrl={paperclipHumanAvatarUrl(item.authorAvatarUrl)} size="default" className="gap-2" />
        </span>
      ) : null}
      {!isHuman && item.authorName && !hideAgentIdentity ? (
        <TaskChatAgentIdentity
          agentName={item.authorName}
          agentIcon={item.agentIcon}
          agent={item.agent}
        />
      ) : null}
      {bodyText.length > 0 ? (
        <div
          // Stable hook so the TaskChatLab bubble-treatment explorations
          // (PAP-501) can scope background/border overrides to the agent
          // bubble body without touching the live thread.
          data-testid={
            isHuman ? "task-chat-human-bubble" : "task-chat-agent-bubble"
          }
          className={cn(
            "break-words py-2 text-sm",
            isOwnMessage
              ? "max-w-(--pct-85) rounded-2xl rounded-br-sm bg-(--liveness-blue) px-3.5 text-white"
              : "w-full bg-transparent px-1 text-foreground",
          )}
        >
          <MarkdownBody
            // The own-message bubble sits on the solid --liveness-blue accent, so the
            // prose body text must follow the bubble's `text-white` rather than
            // the default light-mode prose color (which reads as black on blue).
            // `paperclip-markdown-on-accent` flips prose tokens to currentColor
            // (== inherited white) in both themes; dark mode was already correct
            // only because `prose-invert` happened to lighten the text.
            className={isOwnMessage ? "paperclip-markdown-on-accent" : undefined}
            softBreaks
            linkIssueReferences
            onImageClick={openImage}
          >
            {bodyText}
          </MarkdownBody>
        </div>
      ) : null}
      {imageRefs.length > 0 ? (
        <div
          className="flex max-w-(--pct-85) flex-col gap-2"
          data-testid="task-chat-bubble-media"
        >
          <span className="text-xs text-muted-foreground">
            Images · {imageRefs.length}
          </span>
          <div className="grid grid-cols-4 gap-2">
            {imageRefs
              .slice(0, imageRefs.length > 4 ? 3 : 4)
              .map((ref, index) => (
                <button
                  key={ref.url}
                  type="button"
                  className="group aspect-video min-w-0 overflow-hidden rounded-md bg-muted outline-none focus-visible:ring-2 focus-visible:ring-ring"
                  aria-label={`Open ${ref.name || `image ${index + 1}`}`}
                  onClick={() => openImage(ref.url)}
                >
                  <img
                    src={ref.openPath ?? ref.url}
                    alt={ref.name}
                    loading="lazy"
                    className="h-full w-full object-cover transition-transform group-hover:scale-(--s-1_02)"
                  />
                </button>
              ))}
            {imageRefs.length > 4 ? (
              <button
                type="button"
                className="aspect-video min-w-0 rounded-md bg-muted text-sm font-semibold text-foreground outline-none focus-visible:ring-2 focus-visible:ring-ring"
                aria-label={`Open ${imageRefs.length - 3} more screenshots`}
                onClick={() => openImage(imageRefs[3].url)}
              >
                +{imageRefs.length - 3}
              </button>
            ) : null}
          </div>
          <span className="truncate text-xs text-muted-foreground">
            {imageRefs.map((ref) => ref.name || "image").join(" · ")}
          </span>
        </div>
      ) : null}
      {attachmentRefs.length > 0 ? (
        <div className="flex max-w-(--pct-85) flex-col gap-2">
          <span className="text-xs text-muted-foreground">
            Files · {attachmentRefs.length}
          </span>
          <AttachmentGroup data-testid="task-chat-bubble-attachments">
            {attachmentRefs.map((ref) => {
              const kind = fileKindForAttachment(ref);
              const KindIcon = kind.icon;
              const size = formatFileSize(ref.byteSize);
              const video = isVideoLikeOutput(ref.contentType, ref.name);
              return (
                <Attachment key={ref.url} size="sm">
                  <AttachmentMedia className={video ? "aspect-video group-data-[size=sm]/attachment:w-20" : undefined}>
                    {video ? <ArtifactPreview artifact={{ title: ref.name, contentPath: ref.openPath ?? ref.url, mediaKind: "video" }} /> : <KindIcon aria-hidden />}
                  </AttachmentMedia>
                  <AttachmentContent>
                    <AttachmentTitle className="max-w-48">
                      {ref.name}
                    </AttachmentTitle>
                    <AttachmentDescription className="max-w-48">
                      {size ? `${kind.label} · ${size}` : kind.label}
                    </AttachmentDescription>
                  </AttachmentContent>
                  <AttachmentTrigger
                    aria-label={`Open ${ref.name}`}
                    onClick={video ? () => openImage(ref.url) : undefined}
                    render={video ? <button type="button" /> :
                      <a
                        href={ref.openPath ?? ref.url}
                        onClick={(event) => {
                          if (openText && ref.id && isTextAttachment({ contentType: ref.contentType ?? "", originalFilename: ref.name }) && !event.metaKey && !event.ctrlKey && !event.shiftKey && !event.altKey) {
                            event.preventDefault(); openText(ref.id, ref.name);
                          }
                        }}
                        target="_blank"
                        rel="noreferrer"
                      />
                    }
                  />
                </Attachment>
              );
            })}
          </AttachmentGroup>
        </div>
      ) : null}
      {!isHuman && item.verificationCaveats?.length ? (
        <div
          className="mx-1 w-(--sz-calc-7) rounded-md border border-amber-500/25 bg-amber-500/5 px-3 py-2 text-xs"
          data-testid="task-chat-verification-caveats"
        >
          <p className="font-medium text-amber-800 dark:text-amber-200">
            Verification caveat
          </p>
          <ul className="mt-1 space-y-1 text-muted-foreground">
            {item.verificationCaveats.map((caveat, index) => (
              <li key={`${caveat.commandOrCheck}:${index}`}>
                <span className="font-mono text-foreground">
                  {caveat.commandOrCheck}
                </span>
                {caveat.reasonCode
                  ? ` · ${caveat.reasonCode.replaceAll("_", " ")}`
                  : ""}
                {caveat.detail ? (
                  <span className="block">{caveat.detail}</span>
                ) : null}
              </li>
            ))}
          </ul>
        </div>
      ) : null}
      {item.optimistic ? (
        <span className="flex items-center gap-1 px-1 text-(length:--text-micro) text-muted-foreground">
          <span>{item.optimistic === "queued" ? "Queued" : "Sending…"}</span>
          {item.optimistic === "queued" ? queuedAction : null}
        </span>
      ) : attachedTurn ? (
        // The settled turn takes over the footer line: timestamp + "✓ Worked"
        // summary, always visible; expanding stretches beneath the bubble. The
        // copy/👍/👎 actions (PAP-413) ride the turn's summary row via its
        // `leading` slot — not this wrapper — so they stay anchored to the
        // summary line when the tool history expands beneath it.
        <div
          className="self-stretch"
          data-testid="task-chat-bubble-attached-turn"
        >
          {attachedTurn}
        </div>
      ) : actions ? (
        streamlined ? (
          <div className="flex w-full items-center justify-between gap-2 px-1">
            {item.timestamp ? (
              <span className="text-(length:--text-micro) text-muted-foreground">
                {item.timestamp}
              </span>
            ) : null}
            {actions}
          </div>
        ) : (
          <div className="flex items-center gap-1">
            {actions}
            {item.timestamp ? (
              <span className="px-1 text-(length:--text-micro) text-muted-foreground">
                {item.timestamp}
              </span>
            ) : null}
          </div>
        )
      ) : item.timestamp || sentFromIMessage ? (
        // Timestamps are always visible (round 9) — no longer hover-revealed.
        <span className="px-1 text-(length:--text-micro) text-muted-foreground">
          {sentFromIMessage ? "Sent from iMessage" : null}
          {sentFromIMessage && item.timestamp ? " · " : null}
          {item.timestamp}
        </span>
      ) : null}
      {lightboxSrc !== null && lightboxIndex >= 0 ? (
        <ImageGalleryModal
          items={galleryItems}
          initialIndex={lightboxIndex}
          open
          onOpenChange={(open) => {
            if (!open) setLightboxSrc(null);
          }}
        />
      ) : null}
    </div>
  );
}