import type {  EnvironmentId,  PullRequestActor,  PullRequestComment,  PullRequestDetailView,  PullRequestRef,  ScopedThreadRef,} from "@t3tools/contracts";import {  ChevronDownIcon,  ExternalLinkIcon,  FileCode2Icon,  GitCommitHorizontalIcon,  GitMergeIcon,  GitPullRequestClosedIcon,  GitPullRequestIcon,  MessageSquareIcon,  PencilIcon,} from "lucide-react";import { useState, type ReactNode } from "react"; import { cn } from "~/lib/utils";import { readLocalApi } from "~/localApi";import { pullRequestEnvironment } from "~/state/pullRequests";import { useAtomCommand } from "~/state/use-atom-command";import { formatRelativeTimeLabel } from "~/timestampFormat"; import { Button } from "../ui/button";import { Collapsible, CollapsiblePanel, CollapsibleTrigger } from "../ui/collapsible";import { toastManager } from "../ui/toast";import { Tooltip, TooltipPopup, TooltipTrigger } from "../ui/tooltip";import {  buildPullRequestTimeline,  groupPullRequestTimelineConversations,  isPullRequestVerdictStale,  newestPullRequestCommitAt,  pullRequestReviewOutcome,  type PullRequestReviewOutcome,  type PullRequestTimelineEvent,} from "./pullRequestDetail.logic";import { canEditPullRequestComment } from "./pullRequestEditing.logic";import { PullRequestMarkdown } from "./PullRequestMarkdown";import { PullRequestMarkdownEditor } from "./PullRequestMarkdownEditor";import { PullRequestReactionBar } from "./PullRequestReactions";import {  PullRequestActorAvatar,  PullRequestDiffStat,  PullRequestMetaLine,  PullRequestReviewOutcomeIcon,  pullRequestReviewOutcomeLabel,  pullRequestReviewOutcomeStaleLabel,  pullRequestReviewOutcomeToneClassName,} from "./pullRequestPresentation"; /** What every comment on the timeline needs to react; only the subject differs between them. */interface ReactionSurface {  readonly canReact: boolean;  readonly environmentId: EnvironmentId;  /** Thread the timeline is shown beside, so body links can open in its in-app browser. */  readonly threadRef: ScopedThreadRef | null;  readonly reference: PullRequestRef;  readonly onRefresh: () => void;} function TimelineBody({  body,  markdown,  cwd,  environmentId,  threadRef,}: {  body: string;  markdown: boolean;  cwd: string;  environmentId: EnvironmentId;  threadRef: ScopedThreadRef | null;}) {  return (    <div className="mt-3">      {markdown ? (        <PullRequestMarkdown          text={body}          cwd={cwd}          environmentId={environmentId}          threadRef={threadRef}        />      ) : (        <p className="whitespace-pre-wrap text-xs text-muted-foreground">{body}</p>      )}    </div>  );} function ActorName({ actor }: { actor: PullRequestActor | null }) {  return <span className="font-semibold text-foreground">{actor?.login ?? "ghost"}</span>;} function TimelineMarker({  children,  className,}: {  children: ReactNode;  className?: string | undefined;}) {  return (    <span      className={cn(        "absolute left-0 top-1/2 z-10 flex size-8 -translate-y-1/2 items-center justify-center bg-background",        className,      )}    >      {children}    </span>  );} function IconMarker({ icon, className }: { icon: ReactNode; className?: string | undefined }) {  return (    <TimelineMarker className={className}>      <span className="flex size-7 items-center justify-center bg-background text-muted-foreground">        {icon}      </span>    </TimelineMarker>  );} function ActorTimelineMarker({  actors,  className,  fallback,  muted = false,}: {  actors: ReadonlyArray<PullRequestActor>;  className?: string | undefined;  fallback: ReactNode;  muted?: boolean;}) {  const actor = actors[0];  return actor === undefined ? (    <IconMarker className={className} icon={fallback} />  ) : (    <TimelineMarker className={className}>      <PullRequestActorAvatar        actor={actor}        className={cn(          "size-7 bg-muted text-[9px] transition-opacity",          muted && "opacity-45 grayscale",        )}      />    </TimelineMarker>  );} function friendlyReviewState(value: string): string {  const words = value.toLowerCase().replaceAll("_", " ").replaceAll("-", " ");  return words.replace(/^\w/u, (letter) => letter.toUpperCase());} function ReviewStateBadge({ state }: { state: string }) {  return (    <span className="text-[10px] font-medium text-muted-foreground">      {friendlyReviewState(state)}    </span>  );} function OpenOnHostButton({ url, onOpen }: { url: string | null; onOpen: (url: string) => void }) {  return url === null ? null : (    <Button      size="icon-xs"      variant="ghost"      className="-mr-1 -mt-1 shrink-0 text-muted-foreground"      aria-label="Open activity on host"      onClick={() => onOpen(url)}    >      <ExternalLinkIcon className="size-3" />    </Button>  );} function ConversationCard({  event,  editable,  cwd,  onOpen,  reactions,}: {  event: PullRequestTimelineEvent;  /** The remark behind this entry, only where this reader may rewrite it. */  editable: PullRequestComment | null;  cwd: string;  onOpen: (url: string) => void;  reactions: ReactionSurface;}) {  const [editing, setEditing] = useState(false);  const [saving, setSaving] = useState(false);  const updateComment = useAtomCommand(pullRequestEnvironment.updateComment, {    reportFailure: false,  });   const save = async (body: string) => {    // A review's own summary is not a kind any host rewrites, which is why `editable` is never    // one; the check is here because the comment's own type still allows it.    if (editable === null || saving || editable.kind === "review") return;    setSaving(true);    const result = await updateComment({      environmentId: reactions.environmentId,      input: { ...reactions.reference, commentId: editable.id, kind: editable.kind, body },    });    setSaving(false);    if (result._tag === "Failure") {      toastManager.add({ type: "error", title: "Could not save the comment" });      return;    }    setEditing(false);    reactions.onRefresh();  };   return (    <article className="group py-2">      <div className="px-2">        <div className="flex min-w-0 items-start gap-2">          <div className="min-w-0 flex-1">            <div className="flex min-w-0 flex-wrap items-center gap-x-1.5 gap-y-1 text-xs">              <ActorName actor={event.actor} />              <span className="text-muted-foreground">{event.title}</span>              {event.reviewState ? <ReviewStateBadge state={event.reviewState} /> : null}            </div>            <PullRequestMetaLine className="mt-1 flex-wrap text-[11px] text-muted-foreground">              <span>{formatRelativeTimeLabel(event.at)}</span>              {event.path ? (                <span className="inline-flex min-w-0 items-center gap-1">                  <FileCode2Icon aria-hidden className="size-3 shrink-0" />                  <span className="truncate">{event.path}</span>                </span>              ) : null}            </PullRequestMetaLine>          </div>          {editable !== null && !editing ? (            <Button              size="icon-xs"              variant="ghost"              className="-mt-1 shrink-0 text-muted-foreground opacity-0 transition-opacity group-focus-within:opacity-100 group-hover:opacity-100 focus-visible:opacity-100"              aria-label="Edit comment"              onClick={() => setEditing(true)}            >              <PencilIcon className="size-3" />            </Button>          ) : null}          <OpenOnHostButton url={event.url} onOpen={onOpen} />        </div>      </div>      {editing && editable !== null ? (        <div className="px-2 pb-2 pt-3">          <PullRequestMarkdownEditor            value={editable.body}            cwd={cwd}            environmentId={reactions.environmentId}            threadRef={reactions.threadRef}            label="Edit comment"            saving={saving}            onSave={(body) => void save(body)}            onCancel={() => setEditing(false)}          />        </div>      ) : event.body ? (        <div className="px-2 pb-2">          <TimelineBody            body={event.body}            markdown={event.markdown}            cwd={cwd}            environmentId={reactions.environmentId}            threadRef={reactions.threadRef}          />        </div>      ) : null}      {reactions.canReact || event.reactions.length > 0 ? (        <div className="px-2 pb-2">          <PullRequestReactionBar            reactions={event.reactions}            canReact={reactions.canReact}            subjectId={event.id}            environmentId={reactions.environmentId}            reference={reactions.reference}            onRefresh={reactions.onRefresh}          />        </div>      ) : null}    </article>  );} function uniqueConversationActors(events: ReadonlyArray<PullRequestTimelineEvent>) {  const actors = new Map<string, PullRequestActor>();  for (const event of events) {    const actor = event.actor;    if (actor !== null && !actors.has(actor.login)) actors.set(actor.login, actor);  }  return [...actors.values()];} function ConversationGroup({  events,  editable,  cwd,  onOpen,  reactions,}: {  events: ReadonlyArray<PullRequestTimelineEvent>;  editable: ReadonlyMap<string, PullRequestComment>;  cwd: string;  onOpen: (url: string) => void;  reactions: ReactionSurface;}) {  const [open, setOpen] = useState(false);  const actors = uniqueConversationActors(events);  const first = events[0];  if (first === undefined) return null;   return (    <div className="relative mb-5 pl-12 [contain-intrinsic-block-size:48px] [content-visibility:auto]">      <ActorTimelineMarker        actors={actors}        className="top-6"        fallback={<MessageSquareIcon className="size-3.5" />}        muted={!open}      />      <Collapsible open={open} onOpenChange={setOpen}>        <div>          <CollapsibleTrigger            className={cn(              "flex w-full min-w-0 items-center gap-3 py-2 text-left transition-opacity hover:opacity-100",              open ? "text-foreground opacity-100" : "text-muted-foreground opacity-55",            )}          >            <span className="min-w-0 flex-1">              <span className="block text-xs font-semibold">                {events.length.toLocaleString()} {events.length === 1 ? "comment" : "comments"}              </span>              <span className="block truncate text-[10px] text-muted-foreground">                {actors.length.toLocaleString()} {actors.length === 1 ? "author" : "authors"} ·{" "}                {formatRelativeTimeLabel(first.at)}              </span>            </span>            <ChevronDownIcon              aria-hidden              className={cn(                "size-3.5 shrink-0 text-muted-foreground transition-transform",                open && "rotate-180",              )}            />          </CollapsibleTrigger>          <CollapsiblePanel>            {open ? (              <div className="mt-1 space-y-1">                {events.map((event) => (                  <ConversationCard                    // Named with the pull request too: a remark's id is the host's own, and two                    // pull requests can hand out the same one — which would leave one card's open                    // editor standing over the other's remark.                    key={`${reactions.reference.projectId}#${reactions.reference.number}:${event.id}`}                    event={event}                    editable={editable.get(event.id) ?? null}                    cwd={cwd}                    onOpen={onOpen}                    reactions={reactions}                  />                ))}              </div>            ) : null}          </CollapsiblePanel>        </div>      </Collapsible>    </div>  );} function CommitEvent({  event,  onOpen,}: {  event: PullRequestTimelineEvent;  onOpen: (oid: string) => void;}) {  return (    <button      type="button"      className="group relative mb-5 block w-full rounded-sm pl-12 text-left outline-none [contain-intrinsic-block-size:48px] [content-visibility:auto] focus-visible:ring-2 focus-visible:ring-ring"      aria-label={`View commit ${event.id}`}      onClick={() => onOpen(event.id)}    >      <ActorTimelineMarker        actors={event.commitAuthors}        fallback={<GitCommitHorizontalIcon className="size-3.5" />}      />      <div className="flex min-w-0 items-center gap-2.5 py-1.5">        <div className="min-w-0 flex-1">          <div className="truncate text-xs font-semibold text-foreground transition-colors group-hover:text-primary">            {event.body ?? "Untitled commit"}          </div>          <div className="mt-1 flex flex-wrap items-center gap-x-2 gap-y-0.5 text-[10px] text-muted-foreground">            <code className="font-mono">{event.id.slice(0, 7)}</code>            <span>{formatRelativeTimeLabel(event.at)}</span>          </div>        </div>        {event.additions !== null && event.deletions !== null ? (          <PullRequestDiffStat            additions={event.additions}            deletions={event.deletions}            className="ml-auto shrink-0 font-mono text-[10px]"          />        ) : null}      </div>    </button>  );} function LifecycleEvent({ event }: { event: PullRequestTimelineEvent }) {  const presentation =    event.kind === "opened"      ? {          icon: <GitPullRequestIcon className="size-3.5" />,          label: "Pull request opened",        }      : event.kind === "merged"        ? {            icon: <GitMergeIcon className="size-3.5" />,            label: "Pull request merged",          }        : {            icon: <GitPullRequestClosedIcon className="size-3.5" />,            label: "Pull request closed",          };   return (    <div className="relative mb-5 pl-12 [contain-intrinsic-block-size:48px] [content-visibility:auto]">      <IconMarker icon={presentation.icon} />      <div className="py-1.5 text-xs">        <div className="flex flex-wrap items-center gap-1.5">          {event.actor ? <ActorName actor={event.actor} /> : null}          <span className="font-semibold text-foreground">{presentation.label}</span>        </div>        <div className="mt-0.5 text-[11px] text-muted-foreground">          {formatRelativeTimeLabel(event.at)}        </div>      </div>    </div>  );} /** * A verdict, as its own row rather than a line inside a collapsed conversation. It wears the * reviewer's face on the rail and the verdict's own icon beside their name, so "approved" reads * at a glance from the same place a merge or a commit does. */function ReviewVerdictEvent({  event,  outcome,  stale,  cwd,  onOpen,  reactions,}: {  event: PullRequestTimelineEvent;  outcome: PullRequestReviewOutcome;  /** Commits landed after this verdict, so it speaks for code the branch no longer has. */  stale: boolean;  cwd: string;  onOpen: (url: string) => void;  reactions: ReactionSurface;}) {  return (    <div className="group relative mb-5 pl-12 [contain-intrinsic-block-size:48px] [content-visibility:auto]">      {/* Pinned rather than centred: this row grows with a body and a reaction bar, and a          centred avatar drifts down beside them instead of sitting by the name. */}      <ActorTimelineMarker        actors={event.actor ? [event.actor] : []}        className="top-6"        fallback={<PullRequestReviewOutcomeIcon outcome={outcome} />}      />      <div className="flex min-w-0 items-start gap-2 py-1.5">        <div className="min-w-0 flex-1">          <div className="flex min-w-0 flex-wrap items-center gap-x-1.5 gap-y-1 text-xs">            <ActorName actor={event.actor} />            {/* The word alone, in the verdict's own colour — green for an approval, red for a                request for changes. A verdict overtaken by later commits keeps its word and                loses that colour: it still happened, and it no longer speaks for what is on the                branch. Lowercased in the styling rather than the string, so what a screen reader                announces stays the label every other surface uses. */}            <Tooltip disabled={!stale}>              <TooltipTrigger                render={                  <span                    className={cn(                      "font-medium lowercase",                      stale                        ? "text-muted-foreground opacity-70"                        : pullRequestReviewOutcomeToneClassName(outcome),                    )}                  />

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