From c0e815ae63e82ff717752c2ce9ad4223eb8149de Mon Sep 17 00:00:00 2001
From: Vadim <vadim.olonin@gmail.com>
Date: Sun, 11 Oct 2026 21:50:01 +0300
Subject: [PATCH] history component

---
 src/api/history.api.ts          |  33 ++++
 src/components/HistoryList.vue  | 256 +++++++++++++++++++++++++++++++-
 src/components/IssueDetails.vue |   7 +-
 3 files changed, 292 insertions(+), 4 deletions(-)
 create mode 100644 src/api/history.api.ts

diff --git a/src/api/history.api.ts b/src/api/history.api.ts
new file mode 100644
index 0000000..217ac7f
--- /dev/null
+++ b/src/api/history.api.ts
@@ -0,0 +1,33 @@
+import { apiClient } from '@/lib/api-client.ts'
+import type { User } from '@/api/user.api.ts'
+
+/** created — a pseudo-field: the issue creation record, both values are null */
+export type IssueChangeField = 'created' | 'title' | 'content' | 'status' | 'priority' | 'assignee' | 'dueDate'
+
+/** Values are serialized: priority — number, dueDate — ISO date, assignee — user id */
+export interface IssueFieldChange {
+  field: IssueChangeField
+  oldValue: string | null
+  newValue: string | null
+  /** Only for field = assignee: null — unassigned or the user was deleted */
+  oldUser?: User | null
+  newUser?: User | null
+}
+
+/** One save of the issue: who, when and which fields changed */
+export interface IssueHistoryEntry {
+  /** changeId */
+  id: string
+  changedAt: string
+  actorId: string | null
+  /** null — system change or the actor deleted their account */
+  actor: User | null
+  changes: IssueFieldChange[]
+}
+
+// CLIENT REQUEST
+
+/** Oldest first */
+export async function itemsList(issueId: number) {
+  return apiClient.get<IssueHistoryEntry[]>(`/api/issues/${issueId}/history`)
+}
diff --git a/src/components/HistoryList.vue b/src/components/HistoryList.vue
index 442b6c6..60e19df 100644
--- a/src/components/HistoryList.vue
+++ b/src/components/HistoryList.vue
@@ -1,7 +1,257 @@
-<script setup lang="ts"></script>
+<script setup lang="ts">
+import { computed, reactive, ref, watch } from 'vue'
+import { itemsList, type IssueFieldChange, type IssueHistoryEntry } from '@/api/history.api.ts'
+import type { User } from '@/api/user.api.ts'
+import { useStatusStore } from '@/stores/status.ts'
+
+interface Props {
+  issueId: number
+  /** Changes when the issue is saved — the history is reloaded */
+  version?: string
+}
+
+const { issueId, version } = defineProps<Props>()
+
+const FIELD_LABELS: Record<IssueFieldChange['field'], string> = {
+  created: 'Created',
+  title: 'Title',
+  content: 'Details',
+  status: 'Status',
+  priority: 'Priority',
+  assignee: 'Assignee',
+  dueDate: 'Due Date',
+}
+
+const PRIORITY_LABELS: Record<string, string> = {
+  '0': 'Lowest',
+  '1': 'Low',
+  '2': 'Normal',
+  '3': 'High',
+  '4': 'Highest',
+}
+
+const statusStore = useStatusStore()
+
+const entries = ref<IssueHistoryEntry[]>([])
+const loading = ref(false)
+const error = ref<string | null>(null)
+/** Change keys (entryId:field) with an expanded details diff */
+const expanded = reactive(new Set<string>())
+
+async function load(id: number) {
+  loading.value = true
+  error.value = null
+  try {
+    const res = await itemsList(id)
+    // The issue may have changed while the request was in flight
+    if (id !== issueId) return
+    entries.value = res
+  } catch (e) {
+    error.value = e instanceof Error ? e.message : 'error get issue history'
+  } finally {
+    if (id === issueId) loading.value = false
+  }
+}
+
+watch(
+  () => issueId,
+  (id) => {
+    entries.value = []
+    expanded.clear()
+    load(id)
+  },
+  { immediate: true },
+)
+
+watch(
+  () => version,
+  () => load(issueId),
+)
+
+const dateTimeFormat = new Intl.DateTimeFormat('ru-RU', { dateStyle: 'medium', timeStyle: 'short' })
+
+/** Newest first */
+const items = computed(() =>
+  [...entries.value].reverse().map((entry) => ({
+    entry,
+    time: dateTimeFormat.format(new Date(entry.changedAt)),
+    created: entry.changes.some((c) => c.field === 'created'),
+    changes: entry.changes.filter((c) => c.field !== 'created'),
+  })),
+)
+
+function userName(user: User | null | undefined) {
+  return user ? user.name || user.email : 'Deleted user'
+}
+
+function initials(user: User | null) {
+  return user ? (user.name || user.email || '?')[0]!.toUpperCase() : '?'
+}
+
+function status(alias: string) {
+  return statusStore.statuses?.find((el) => el.alias === alias)
+}
+
+function formatValue(change: IssueFieldChange, value: string | null) {
+  if (value === null || value === '') return 'None'
+  switch (change.field) {
+    case 'status':
+      return status(value)?.name ?? value
+    case 'priority':
+      return PRIORITY_LABELS[value] ?? value
+    case 'dueDate':
+      return new Date(value).toLocaleDateString('ru-RU')
+    default:
+      return value
+  }
+}
+
+function changeKey(entry: IssueHistoryEntry, change: IssueFieldChange) {
+  return `${entry.id}:${change.field}`
+}
+
+function toggle(key: string) {
+  if (expanded.has(key)) expanded.delete(key)
+  else expanded.add(key)
+}
+</script>
 
 <template>
-  <v-sheet class="px-4 py-2"> History </v-sheet>
+  <div class="history px-2 py-3">
+    <div v-if="loading && entries.length === 0" class="history__placeholder">
+      <v-progress-circular indeterminate size="24" width="2" />
+    </div>
+
+    <div v-else-if="error && entries.length === 0" class="history__placeholder text-error">{{ error }}</div>
+
+    <div v-else-if="entries.length === 0" class="history__placeholder text-medium-emphasis">No history yet</div>
+
+    <div v-for="item in items" :key="item.entry.id" class="history__entry">
+      <v-avatar
+        :image="item.entry.actor?.image ?? undefined"
+        :text="initials(item.entry.actor)"
+        color="primary"
+        rounded="circle"
+        density="compact"
+        border
+      />
+
+      <div class="history__body">
+        <div class="d-flex flex-wrap align-baseline ga-2">
+          <span class="font-weight-medium">{{ userName(item.entry.actor) }}</span>
+          <span v-if="item.created" class="text-medium-emphasis">created the issue</span>
+          <span v-else class="text-medium-emphasis">made changes</span>
+          <span class="text-medium-emphasis text-body-small ms-auto">{{ item.time }}</span>
+        </div>
+
+        <div v-for="change in item.changes" :key="change.field" class="history__change">
+          <div class="text-medium-emphasis">{{ FIELD_LABELS[change.field] }}:</div>
+
+          <div v-if="change.field === 'content'">
+            <a class="history__toggle text-primary" @click="toggle(changeKey(item.entry, change))">
+              {{ expanded.has(changeKey(item.entry, change)) ? 'Hide changes' : 'Show changes' }}
+            </a>
+            <div v-if="expanded.has(changeKey(item.entry, change))" class="d-flex flex-column ga-1 mt-1">
+              <v-sheet border class="history__text history__text--old px-2 py-1">
+                {{ formatValue(change, change.oldValue) }}
+              </v-sheet>
+              <v-sheet border class="history__text px-2 py-1">{{ formatValue(change, change.newValue) }}</v-sheet>
+            </div>
+          </div>
+
+          <div v-else-if="change.field === 'assignee'" class="history__values">
+            <span class="history__old">{{ change.oldValue ? userName(change.oldUser) : 'Unassigned' }}</span>
+            <v-icon icon="mdi-arrow-right" size="small" />
+            <span>{{ change.newValue ? userName(change.newUser) : 'Unassigned' }}</span>
+          </div>
+
+          <div v-else-if="change.field === 'status'" class="history__values">
+            <v-chip
+              v-if="change.oldValue"
+              :color="status(change.oldValue)?.color"
+              :text="formatValue(change, change.oldValue)"
+              density="compact"
+              variant="flat"
+              label
+            />
+            <span v-else class="history__old">None</span>
+            <v-icon icon="mdi-arrow-right" size="small" />
+            <v-chip
+              :color="change.newValue ? status(change.newValue)?.color : undefined"
+              :text="formatValue(change, change.newValue)"
+              density="compact"
+              variant="flat"
+              label
+            />
+          </div>
+
+          <div v-else class="history__values">
+            <span class="history__old">{{ formatValue(change, change.oldValue) }}</span>
+            <v-icon icon="mdi-arrow-right" size="small" />
+            <span>{{ formatValue(change, change.newValue) }}</span>
+          </div>
+        </div>
+      </div>
+    </div>
+  </div>
 </template>
 
-<style scoped lang="scss"></style>
+<style scoped lang="scss">
+.history {
+  display: flex;
+  flex-direction: column;
+  gap: 16px;
+  height: 100%;
+  overflow-y: auto;
+
+  &__placeholder {
+    margin: auto;
+  }
+
+  &__entry {
+    display: flex;
+    gap: 8px;
+  }
+
+  &__body {
+    flex: 1;
+    min-width: 0;
+  }
+
+  &__change {
+    display: grid;
+    grid-template-columns: 6rem 1fr;
+    column-gap: 0.5rem;
+    margin-top: 6px;
+  }
+
+  &__values {
+    display: flex;
+    flex-wrap: wrap;
+    align-items: center;
+    gap: 6px;
+    min-width: 0;
+    overflow-wrap: anywhere;
+  }
+
+  &__old {
+    text-decoration: line-through;
+    opacity: 0.7;
+  }
+
+  &__toggle {
+    cursor: pointer;
+  }
+
+  &__text {
+    white-space: pre-wrap;
+    overflow-wrap: anywhere;
+    max-height: 12rem;
+    overflow-y: auto;
+
+    &--old {
+      opacity: 0.7;
+    }
+  }
+}
+</style>
diff --git a/src/components/IssueDetails.vue b/src/components/IssueDetails.vue
index 5f5025c..661923b 100644
--- a/src/components/IssueDetails.vue
+++ b/src/components/IssueDetails.vue
@@ -164,7 +164,12 @@ defineExpose({
 
           <div class="activity__window">
             <comments-list v-if="activity === 'comment'" :issue-id="issue.id" class="h-100" />
-            <history-list v-else-if="activity === 'history'" />
+            <history-list
+              v-else-if="activity === 'history'"
+              :issue-id="issue.id"
+              :version="issue.updatedAt"
+              class="h-100"
+            />
           </div>
         </v-sheet>
       </expansion-panel>