feat: línea de tiempo mezclada en el detalle (Fase 2)

src/app/issues/[id]/page.tsx

@@ -4,13 +4,13 @@ import Link from "next/link";
 import { useParams, useRouter } from "next/navigation";
 import { useCallback, useEffect, useState } from "react";
 import { api } from "@/lib/api";
-import type { Comment, Issue, IssueStatus } from "@/lib/types";
+import type { Activity, Comment, Issue, IssueStatus } from "@/lib/types";
 import { PRIORITY_META, TYPE_META } from "@/lib/meta";
 import { formatLongDate, formatRelative } from "@/lib/format";
 import { useReference, useReferenceLookups, useWorkflowStates } from "@/lib/store";
 import { useAuth } from "@/lib/auth";
 import { AppShell } from "@/components/layout/AppShell";
-import { Avatar } from "@/components/ui/Avatar";
+import { ActivityFeed } from "@/components/issues/ActivityFeed";
 import { EmptyState } from "@/components/ui/EmptyState";
 import { TypeIcon } from "@/components/ui/Icons";
 
@@ -36,22 +36,25 @@ function IssueDetail({ issueId }: { issueId: string }) {
   const { user } = useAuth();
   const { meta, order } = useWorkflowStates();
   const { users, projects, cycles, labels } = useReference();
-  const { projectById, userById } = useReferenceLookups();
+  const { projectById } = useReferenceLookups();
 
   const [issue, setIssue] = useState<Issue | null>(null);
   const [comments, setComments] = useState<Comment[]>([]);
+  const [activity, setActivity] = useState<Activity[]>([]);
   const [loading, setLoading] = useState(true);
   const [draft, setDraft] = useState("");
 
   const load = useCallback(async () => {
     setLoading(true);
-    const [found, issueComments] = await Promise.all([
+    const [found, issueComments, issueActivity] = await Promise.all([
       api.getIssue(issueId),
       api.listComments(issueId),
+      api.listActivity(issueId),
     ]);
 
     setIssue(found);
     setComments(issueComments);
+    setActivity(issueActivity);
     setLoading(false);
   }, [issueId]);
 
@@ -67,8 +70,13 @@ function IssueDetail({ issueId }: { issueId: string }) {
     setIssue((current) => (current ? { ...current, ...partial } : current));
 
     try {
-      const updated = await api.updateIssue(issue.id, partial);
+      const updated = await api.updateIssue(issue.id, {
+        ...partial,
+        ...(user ? { actorId: user.id } : {}),
+      });
       setIssue(updated);
+      // Refrescar la línea de tiempo con los eventos recién creados.
+      void api.listActivity(issue.id).then(setActivity);
     } catch {
       // Revertir si el backend rechaza el cambio.
       void load();
@@ -84,6 +92,7 @@ function IssueDetail({ issueId }: { issueId: string }) {
     setDraft("");
     const created = await api.addComment(issueId, body, user.id);
     setComments((current) => [...current, created]);
+    void api.listActivity(issueId).then(setActivity);
   }
 
   if (loading) {
@@ -150,35 +159,21 @@ function IssueDetail({ issueId }: { issueId: string }) {
           )}
         </div>
 
-        {/* Comentarios */}
+        {/* Línea de tiempo: comentarios + eventos del log (Fase 2) */}
         <section>
           <div className="detail-section-title">Actividad</div>
 
-          {comments.length === 0 && (
-            <p style={{ color: "var(--lp-text-faint)", fontSize: 13 }}>
-              Sin comentarios todavía.
-            </p>
-          )}
-
-          {comments.map((comment) => {
-            const author = userById.get(comment.authorId);
-            return (
-              <div key={comment.id} className="comment">
-                <Avatar user={author} size="lg" />
-                <div className="flex-grow-1">
-                  <div className="d-flex align-items-baseline gap-2 mb-1">
-                    <span style={{ fontSize: 13, fontWeight: 600 }}>
-                      {author?.name ?? "Desconocido"}
-                    </span>
-                    <span style={{ fontSize: 12, color: "var(--lp-text-faint)" }}>
-                      {formatRelative(comment.createdAt)}
-                    </span>
-                  </div>
-                  <div className="comment-body">{comment.body}</div>
-                </div>
-              </div>
-            );
-          })}
+          <ActivityFeed
+            comments={comments}
+            activity={activity}
+            users={new Map(users.map((u) => [u.id, u]))}
+            states={Object.fromEntries(
+              order.map((key) => [key, { label: meta[key]?.label ?? key }]),
+            )}
+            projects={new Map(projects.map((p) => [p.id, p]))}
+            cycles={new Map(cycles.map((c) => [c.id, c]))}
+            labels={new Map(labels.map((l) => [l.id, l]))}
+          />
 
           <form onSubmit={handleComment} className="mt-3">
             <textarea

src/components/issues/ActivityFeed.tsx

@@ -0,0 +1,201 @@
+"use client";
+
+import { useMemo } from "react";
+import type { Activity, Comment, Cycle, Label, Project, User } from "@/lib/types";
+import { formatRelative } from "@/lib/format";
+import { Avatar } from "@/components/ui/Avatar";
+
+interface ActivityFeedProps {
+  comments: Comment[];
+  activity: Activity[];
+  users: Map<string, User>;
+  states: Record<string, { label: string }>;
+  projects: Map<string, Project>;
+  cycles: Map<string, Cycle>;
+  labels: Map<string, Label>;
+}
+
+type FeedItem =
+  | { kind: "comment"; at: string; comment: Comment }
+  | { kind: "event"; at: string; event: Activity };
+
+/**
+ * Línea de tiempo mezclada de un issue (Fase 2): comentarios y eventos
+ * del log en orden cronológico, con descripciones legibles.
+ *
+ * Los valores guardados son claves/ids; aquí se resuelven a nombres
+ * usando los datos de referencia (usuarios, estados, proyectos...).
+ */
+export function ActivityFeed({ comments, activity, users, states, projects, cycles, labels }: ActivityFeedProps) {
+  const items = useMemo<FeedItem[]>(() => {
+    const list: FeedItem[] = [
+      ...comments.map((comment) => ({ kind: "comment" as const, at: comment.createdAt, comment })),
+      ...activity
+        // Los comentarios ya se muestran como tales; no duplicarlos.
+        .filter((event) => event.action !== "comment_added")
+        .map((event) => ({ kind: "event" as const, at: event.createdAt, event })),
+    ];
+    return list.sort((a, b) => a.at.localeCompare(b.at));
+  }, [comments, activity]);
+
+  if (items.length === 0) {
+    return (
+      <p style={{ color: "var(--inv-muted)", fontSize: 13 }}>
+        Sin actividad todavía.
+      </p>
+    );
+  }
+
+  return (
+    <div>
+      {items.map((item) =>
+        item.kind === "comment" ? (
+          <CommentRow
+            key={`c-${item.comment.id}`}
+            comment={item.comment}
+            author={users.get(item.comment.authorId)}
+          />
+        ) : (
+          <EventRow
+            key={`e-${item.event.id}`}
+            event={item.event}
+            actor={item.event.actorId ? users.get(item.event.actorId) : undefined}
+            states={states}
+            projects={projects}
+            cycles={cycles}
+            labels={labels}
+            users={users}
+          />
+        ),
+      )}
+    </div>
+  );
+}
+
+function CommentRow({ comment, author }: { comment: Comment; author?: User }) {
+  return (
+    <div className="comment">
+      <Avatar user={author} size="lg" />
+      <div className="flex-grow-1">
+        <div className="d-flex align-items-baseline gap-2 mb-1">
+          <span style={{ fontSize: 13, fontWeight: 600 }}>{author?.name ?? "Desconocido"}</span>
+          <span style={{ fontSize: 12, color: "var(--inv-muted)" }}>
+            {formatRelative(comment.createdAt)}
+          </span>
+        </div>
+        <div className="comment-body">{comment.body}</div>
+      </div>
+    </div>
+  );
+}
+
+/** Nombre legible de un valor según la acción (id → nombre cuando aplica). */
+function resolveValue(
+  action: string,
+  value: string | null,
+  ctx: {
+    states: Record<string, { label: string }>;
+    projects: Map<string, Project>;
+    cycles: Map<string, Cycle>;
+    labels: Map<string, Label>;
+    users: Map<string, User>;
+  },
+): string {
+  if (value == null || value === "") return "—";
+
+  switch (action) {
+    case "status":
+      return ctx.states[value]?.label ?? value;
+    case "assignee":
+      return ctx.users.get(value)?.name ?? value;
+    case "project":
+      return ctx.projects.get(value)?.name ?? value;
+    case "cycle":
+      return ctx.cycles.get(value)?.name ?? value;
+    case "labels":
+      if (value === "") return "ninguna";
+      return value
+        .split(",")
+        .map((id) => ctx.labels.get(id)?.name ?? id)
+        .join(", ");
+    case "priority": {
+      const names: Record<string, string> = {
+        "0": "sin prioridad",
+        "1": "baja",
+        "2": "media",
+        "3": "alta",
+        "4": "urgente",
+      };
+      return names[value] ?? value;
+    }
+    case "parent":
+      return value === "" ? "raíz" : `issue #${value}`;
+    default:
+      return value.length > 120 ? `${value.slice(0, 120)}…` : value;
+  }
+}
+
+const ACTION_VERB: Record<string, string> = {
+  created: "creó el issue",
+  status: "cambió el estado",
+  assignee: "reasignó el issue",
+  priority: "cambió la prioridad",
+  type: "cambió el tipo",
+  title: "renombró el issue",
+  description: "editó la descripción",
+  project: "movió el issue de proyecto",
+  cycle: "movió el issue de ciclo",
+  labels: "actualizó las etiquetas",
+  parent: "movió el issue en la jerarquía",
+  relation_added: "vinculó el issue",
+  relation_removed: "quitó un vínculo",
+  subscribed: "se suscribió",
+  unsubscribed: "dejó de seguir",
+};
+
+function EventRow({
+  event,
+  actor,
+  states,
+  projects,
+  cycles,
+  labels,
+  users,
+}: {
+  event: Activity;
+  actor?: User;
+  states: Record<string, { label: string }>;
+  projects: Map<string, Project>;
+  cycles: Map<string, Cycle>;
+  labels: Map<string, Label>;
+  users: Map<string, User>;
+}) {
+  const ctx = { states, projects, cycles, labels, users };
+  const verb = ACTION_VERB[event.action] ?? event.action;
+
+  // Acciones con antes/después; el resto muestra el valor nuevo o nada.
+  const hasTransition = event.oldValue != null || event.newValue != null;
+  const detail =
+    event.action === "created"
+      ? ` (${event.newValue})`
+      : hasTransition
+        ? `: ${resolveValue(event.action, event.oldValue, ctx)} → ${resolveValue(event.action, event.newValue, ctx)}`
+        : "";
+
+  return (
+    <div className="comment" style={{ alignItems: "center" }}>
+      <Avatar user={actor} />
+      <div className="flex-grow-1" style={{ fontSize: 13, color: "var(--inv-muted)" }}>
+        <span style={{ fontWeight: 600, color: "var(--bs-body-color)" }}>
+          {actor?.name ?? "Sistema"}
+        </span>{" "}
+        {verb}
+        {detail}
+        <span style={{ fontSize: 12, color: "var(--inv-muted)" }}>
+          {" "}
+          · {formatRelative(event.createdAt)}
+        </span>
+      </div>
+    </div>
+  );
+}

src/lib/api/client.ts

@@ -1,4 +1,5 @@
 import type {
+  Activity,
   Comment,
   Cycle,
   ID,
@@ -41,6 +42,9 @@ export interface ProyectosApi {
   createIssue(input: IssueInput): Promise<Issue>;
   updateIssue(id: ID, patch: Partial<IssueInput>): Promise<Issue>;
 
+  // Línea de tiempo (Fase 2 en sam): eventos de creación, cambios y comentarios.
+  listActivity(issueId: ID): Promise<Activity[]>;
+
   // Comentarios
   listComments(issueId: ID): Promise<Comment[]>;
   /** `authorId` es el idUsuario del usuario en sesión. */

src/lib/api/http.ts

@@ -1,4 +1,5 @@
 import type {
+  Activity,
   Comment,
   Cycle,
   ID,
@@ -158,6 +159,8 @@ export const httpApi: ProyectosApi = {
       body: JSON.stringify(patch),
     }),
 
+  listActivity: (issueId: ID) => request<Activity[]>(`/api/proyectos/issues/${issueId}/activity`),
+
   listComments: (issueId: ID) => request<Comment[]>(`/api/proyectos/issues/${issueId}/comments`),
 
   addComment: (issueId: ID, body: string, authorId: ID) =>

src/lib/api/mock.ts

@@ -1,4 +1,5 @@
 import type {
+  Activity,
   Comment,
   Cycle,
   ID,
@@ -25,6 +26,7 @@ import type { ProyectosApi } from "./client";
 const state = {
   issues: structuredClone(seed.issues),
   comments: structuredClone(seed.comments),
+  activity: [] as Activity[],
   projects: structuredClone(seed.projects),
   cycles: structuredClone(seed.cycles),
   users: structuredClone(seed.users),
@@ -34,6 +36,25 @@ const state = {
 };
 
 /** Claves que cuentan como terminadas (bandera is_done de la API). */
+/** Registra un evento en la línea de tiempo (réplica del backend). */
+function logActivity(
+  issueId: ID,
+  actorId: ID | null,
+  action: string,
+  oldValue: string | null,
+  newValue: string | null,
+) {
+  state.activity.push({
+    id: nextId("ev"),
+    issueId,
+    actorId,
+    action,
+    oldValue,
+    newValue,
+    createdAt: new Date().toISOString(),
+  });
+}
+
 function doneKeys(): Set<string> {
   return new Set(state.states.filter((s) => s.isDone).map((s) => s.key));
 }
@@ -203,6 +224,7 @@ export const mockApi: ProyectosApi = {
     };
 
     state.issues.unshift(issue);
+    logActivity(issue.id, null, "created", null, issue.identifier);
     return issue;
   },
 
@@ -211,6 +233,26 @@ export const mockApi: ProyectosApi = {
     const issue = state.issues.find((i) => i.id === id);
     if (!issue) throw new Error(`Issue ${id} no encontrado`);
 
+    // Solo se registra lo que cambió de verdad (igual que el backend).
+    const actor = (patch as { actorId?: ID }).actorId ?? null;
+    const changed: Array<[string, string | null, string | null]> = [];
+    const track = (action: string, oldV: unknown, newV: unknown) => {
+      const o = oldV == null ? null : String(oldV);
+      const n = newV == null ? null : String(newV);
+      if (o !== n) changed.push([action, o, n]);
+    };
+
+    if (patch.title !== undefined) track("title", issue.title, patch.title);
+    if (patch.description !== undefined) track("description", issue.description, patch.description);
+    if (patch.status !== undefined) track("status", issue.status, patch.status);
+    if (patch.type !== undefined) track("type", issue.type, patch.type);
+    if (patch.priority !== undefined) track("priority", issue.priority, patch.priority);
+    if (patch.assigneeId !== undefined) track("assignee", issue.assigneeId, patch.assigneeId);
+    if (patch.projectId !== undefined) track("project", issue.projectId, patch.projectId);
+    if (patch.cycleId !== undefined) track("cycle", issue.cycleId, patch.cycleId);
+    if (patch.labelIds !== undefined)
+      track("labels", issue.labelIds.join(","), patch.labelIds.join(","));
+
     Object.assign(issue, patch, { updatedAt: new Date().toISOString() });
 
     // Mantener `completedAt` coherente con el estado final
@@ -218,9 +260,17 @@ export const mockApi: ProyectosApi = {
     const isFinished = doneKeys().has(issue.status);
     issue.completedAt = isFinished ? (issue.completedAt ?? new Date().toISOString()) : null;
 
+    for (const [action, o, n] of changed) logActivity(id, actor, action, o, n);
     return issue;
   },
 
+  async listActivity(issueId: ID): Promise<Activity[]> {
+    await delay(60);
+    return state.activity
+      .filter((e) => e.issueId === issueId)
+      .sort((a, b) => a.createdAt.localeCompare(b.createdAt));
+  },
+
   async listComments(issueId: ID): Promise<Comment[]> {
     await delay(60);
     return state.comments.filter((c) => c.issueId === issueId);
@@ -236,6 +286,7 @@ export const mockApi: ProyectosApi = {
       createdAt: new Date().toISOString(),
     };
     state.comments.push(comment);
+    logActivity(issueId, authorId, "comment_added", null, body.slice(0, 200));
     return comment;
   },
 };

src/lib/types.ts

@@ -82,6 +82,22 @@ export interface Cycle {
   status: "upcoming" | "active" | "completed";
 }
 
+/**
+ * Evento del log de actividad (Fase 2 en sam).
+ * action: created, status, assignee, priority, type, title, description,
+ * project, cycle, labels, comment_added, parent, relation_added,
+ * relation_removed, subscribed, unsubscribed.
+ */
+export interface Activity {
+  id: ID;
+  issueId: ID;
+  actorId: ID | null;
+  action: string;
+  oldValue: string | null;
+  newValue: string | null;
+  createdAt: string;
+}
+
 export interface Comment {
   id: ID;
   issueId: ID;
@@ -119,7 +135,11 @@ export interface IssueFilters {
   query?: string;
 }
 
-/** Payload para crear/actualizar un issue. */
+/**
+ * Payload para crear/actualizar un issue.
+ * actorId es transitorio: el backend lo usa como autor del log y no lo
+ * persiste en el issue (ver BuildPatch en sam).
+ */
 export interface IssueInput {
   title: string;
   description?: string;
@@ -130,4 +150,5 @@ export interface IssueInput {
   projectId?: ID | null;
   cycleId?: ID | null;
   labelIds?: ID[];
+  actorId?: ID;
 }