feat: Advanced Search Backend (#12917)

## Description

Implements comprehensive search functionality with advanced filtering
capabilities for Chatwoot (Linear: CW-5956).

This PR adds:
1. **Time-based filtering** for contacts and conversations (SQL-based
search)
2. **Advanced message search** with multiple filters
(OpenSearch/Elasticsearch-based)
- **`from` filter**: Filter messages by sender (format: `contact:42` or
`agent:5`)
   - **`inbox_id` filter**: Filter messages by specific inbox
- **Time range filters**: Filter messages using `since` and `until`
parameters (Unix timestamps in seconds)
- **90-day limit enforcement**: Automatically limits searches to the
last 90 days to prevent performance issues

The implementation extends the existing `Enterprise::SearchService`
module for advanced features and adds time filtering to the base
`SearchService` for SQL-based searches.

## API Documentation

### Base URL
All search endpoints follow this pattern:
```
GET /api/v1/accounts/{account_id}/search/{resource}
```

### Authentication
All requests require authentication headers:
```
api_access_token: YOUR_ACCESS_TOKEN
```

---

## 1. Search All Resources

**Endpoint:** `GET /api/v1/accounts/{account_id}/search`

Returns results from all searchable resources (contacts, conversations,
messages, articles).

### Parameters
| Parameter | Type | Description | Required |
|-----------|------|-------------|----------|
| `q` | string | Search query | Yes |
| `page` | integer | Page number (15 items per page) | No |
| `since` | integer | Unix timestamp (contacts/conversations only) | No
|
| `until` | integer | Unix timestamp (contacts/conversations only) | No
|

### Example Request
```bash
curl -X GET "https://app.chatwoot.com/api/v1/accounts/1/search?q=customer" \
  -H "api_access_token: YOUR_ACCESS_TOKEN"
```

### Example Response
```json
{
  "payload": {
    "contacts": [...],
    "conversations": [...],
    "messages": [...],
    "articles": [...]
  }
}
```

---

## 2. Search Contacts

**Endpoint:** `GET /api/v1/accounts/{account_id}/search/contacts`

Search contacts by name, email, phone number, or identifier with
optional time filtering.

### Parameters
| Parameter | Type | Description | Required |
|-----------|------|-------------|----------|
| `q` | string | Search query | Yes |
| `page` | integer | Page number (15 items per page) | No |
| `since` | integer | Unix timestamp - filter by last_activity_at | No |
| `until` | integer | Unix timestamp - filter by last_activity_at | No |

### Example Requests

**Basic search:**
```bash
curl -X GET "https://app.chatwoot.com/api/v1/accounts/1/search/contacts?q=john" \
  -H "api_access_token: YOUR_ACCESS_TOKEN"
```

**Search contacts active in the last 7 days:**
```bash
SINCE=$(date -v-7d +%s)
curl -X GET "https://app.chatwoot.com/api/v1/accounts/1/search/contacts?q=john&since=${SINCE}" \
  -H "api_access_token: YOUR_ACCESS_TOKEN"
```

**Search contacts active between 30 and 7 days ago:**
```bash
SINCE=$(date -v-30d +%s)
UNTIL=$(date -v-7d +%s)
curl -X GET "https://app.chatwoot.com/api/v1/accounts/1/search/contacts?q=john&since=${SINCE}&until=${UNTIL}" \
  -H "api_access_token: YOUR_ACCESS_TOKEN"
```

### Example Response
```json
{
  "payload": {
    "contacts": [
      {
        "id": 42,
        "email": "john@example.com",
        "name": "John Doe",
        "phone_number": "+1234567890",
        "identifier": "user_123",
        "additional_attributes": {},
        "created_at": 1701234567
      }
    ]
  }
}
```

---

## 3. Search Conversations

**Endpoint:** `GET /api/v1/accounts/{account_id}/search/conversations`

Search conversations by display ID, contact name, email, phone number,
or identifier with optional time filtering.

### Parameters
| Parameter | Type | Description | Required |
|-----------|------|-------------|----------|
| `q` | string | Search query | Yes |
| `page` | integer | Page number (15 items per page) | No |
| `since` | integer | Unix timestamp - filter by last_activity_at | No |
| `until` | integer | Unix timestamp - filter by last_activity_at | No |

### Example Requests

**Basic search:**
```bash
curl -X GET "https://app.chatwoot.com/api/v1/accounts/1/search/conversations?q=billing" \
  -H "api_access_token: YOUR_ACCESS_TOKEN"
```

**Search conversations active in the last 24 hours:**
```bash
SINCE=$(date -v-1d +%s)
curl -X GET "https://app.chatwoot.com/api/v1/accounts/1/search/conversations?q=billing&since=${SINCE}" \
  -H "api_access_token: YOUR_ACCESS_TOKEN"
```

**Search conversations from last month:**
```bash
SINCE=$(date -v-30d +%s)
UNTIL=$(date +%s)
curl -X GET "https://app.chatwoot.com/api/v1/accounts/1/search/conversations?q=billing&since=${SINCE}&until=${UNTIL}" \
  -H "api_access_token: YOUR_ACCESS_TOKEN"
```

### Example Response
```json
{
  "payload": {
    "conversations": [
      {
        "id": 123,
        "display_id": 45,
        "inbox_id": 1,
        "status": "open",
        "messages": [...],
        "meta": {...}
      }
    ]
  }
}
```

---

## 4. Search Messages (Advanced)

**Endpoint:** `GET /api/v1/accounts/{account_id}/search/messages`

Advanced message search with multiple filters powered by
OpenSearch/Elasticsearch.

### Prerequisites
- OpenSearch/Elasticsearch must be running (`OPENSEARCH_URL` env var
configured)
- Account must have `advanced_search` feature flag enabled
- Messages must be indexed in OpenSearch

### Parameters
| Parameter | Type | Description | Required |
|-----------|------|-------------|----------|
| `q` | string | Search query | Yes |
| `page` | integer | Page number (15 items per page) | No |
| `from` | string | Filter by sender: `contact:{id}` or `agent:{id}` |
No |
| `inbox_id` | integer | Filter by specific inbox ID | No |
| `since` | integer | Unix timestamp - searches from this time (max 90
days ago) | No |
| `until` | integer | Unix timestamp - searches until this time | No |

### Important Notes
- **90-Day Limit**: If `since` is not provided, searches default to the
last 90 days
- If `since` exceeds 90 days, returns `422` error: "Search is limited to
the last 90 days"
- All time filters use message `created_at` timestamp

### Example Requests

**Basic message search:**
```bash
curl -X GET "https://app.chatwoot.com/api/v1/accounts/1/search/messages?q=refund" \
  -H "api_access_token: YOUR_ACCESS_TOKEN"
```

**Search messages from a specific contact:**
```bash
curl -X GET "https://app.chatwoot.com/api/v1/accounts/1/search/messages?q=refund&from=contact:42" \
  -H "api_access_token: YOUR_ACCESS_TOKEN"
```

**Search messages from a specific agent:**
```bash
curl -X GET "https://app.chatwoot.com/api/v1/accounts/1/search/messages?q=refund&from=agent:5" \
  -H "api_access_token: YOUR_ACCESS_TOKEN"
```

**Search messages in a specific inbox:**
```bash
curl -X GET "https://app.chatwoot.com/api/v1/accounts/1/search/messages?q=refund&inbox_id=3" \
  -H "api_access_token: YOUR_ACCESS_TOKEN"
```

**Search messages from the last 7 days:**
```bash
SINCE=$(date -v-7d +%s)
curl -X GET "https://app.chatwoot.com/api/v1/accounts/1/search/messages?q=refund&since=${SINCE}" \
  -H "api_access_token: YOUR_ACCESS_TOKEN"
```

**Search messages between specific dates:**
```bash
SINCE=$(date -v-30d +%s)
UNTIL=$(date -v-7d +%s)
curl -X GET "https://app.chatwoot.com/api/v1/accounts/1/search/messages?q=refund&since=${SINCE}&until=${UNTIL}" \
  -H "api_access_token: YOUR_ACCESS_TOKEN"
```

**Combine all filters:**
```bash
SINCE=$(date -v-14d +%s)
curl -X GET "https://app.chatwoot.com/api/v1/accounts/1/search/messages?q=refund&from=contact:42&inbox_id=3&since=${SINCE}" \
  -H "api_access_token: YOUR_ACCESS_TOKEN"
```

**Attempt to search beyond 90 days (returns error):**
```bash
SINCE=$(date -v-120d +%s)
curl -X GET "https://app.chatwoot.com/api/v1/accounts/1/search/messages?q=refund&since=${SINCE}" \
  -H "api_access_token: YOUR_ACCESS_TOKEN"
```

### Example Response (Success)
```json
{
  "payload": {
    "messages": [
      {
        "id": 789,
        "content": "I need a refund for my purchase",
        "message_type": "incoming",
        "created_at": 1701234567,
        "conversation_id": 123,
        "inbox_id": 3,
        "sender": {
          "id": 42,
          "type": "contact"
        }
      }
    ]
  }
}
```

### Example Response (90-day limit exceeded)
```json
{
  "error": "Search is limited to the last 90 days"
}
```
**Status Code:** `422 Unprocessable Entity`

---

## 5. Search Articles

**Endpoint:** `GET /api/v1/accounts/{account_id}/search/articles`

Search help center articles by title or content.

### Parameters
| Parameter | Type | Description | Required |
|-----------|------|-------------|----------|
| `q` | string | Search query | Yes |
| `page` | integer | Page number (15 items per page) | No |

### Example Request
```bash
curl -X GET "https://app.chatwoot.com/api/v1/accounts/1/search/articles?q=installation" \
  -H "api_access_token: YOUR_ACCESS_TOKEN"
```

### Example Response
```json
{
  "payload": {
    "articles": [
      {
        "id": 456,
        "title": "Installation Guide",
        "slug": "installation-guide",
        "portal_slug": "help",
        "account_id": 1,
        "category_name": "Getting Started",
        "status": "published",
        "updated_at": 1701234567
      }
    ]
  }
}
```

---

## Technical Implementation

### SQL-Based Search (Contacts, Conversations, Articles)
- Uses PostgreSQL `ILIKE` queries by default
- Optional GIN index support via `search_with_gin` feature flag for
better performance
- Time filtering uses `last_activity_at` for contacts/conversations
- Returns paginated results (15 per page)

### Advanced Search (Messages)
- Powered by OpenSearch/Elasticsearch via Searchkick gem
- Requires `OPENSEARCH_URL` environment variable
- Requires `advanced_search` account feature flag
- Enforces 90-day lookback limit via
`Limits::MESSAGE_SEARCH_TIME_RANGE_LIMIT_DAYS`
- Validates inbox access permissions before filtering
- Returns paginated results (15 per page)

---

## Type of change

- [x] New feature (non-breaking change which adds functionality)
- [x] Enhancement (improves existing functionality)

---

## How Has This Been Tested?

### Unit Tests
- **Contact Search Tests**: 3 new test cases for time filtering
(`since`, `until`, combined)
- **Conversation Search Tests**: 3 new test cases for time filtering
- **Message Search Tests**: 10+ test cases covering:
  - Individual filters (`from`, `inbox_id`, time range)
  - Combined filters
  - Permission validation for inbox access
  - Feature flag checks
  - 90-day limit enforcement
  - Error handling for exceeded time limits

### Test Commands
```bash
# Run all search controller tests
bundle exec rspec spec/controllers/api/v1/accounts/search_controller_spec.rb

# Run search service tests (includes enterprise specs)
bundle exec rspec spec/services/search_service_spec.rb
```

### Manual Testing Setup
A rake task is provided to create 50,000 test messages across multiple
inboxes:

```bash
# 1. Create test data
bundle exec rake search:setup_test_data

# 2. Start OpenSearch
mise elasticsearch-start

# 3. Reindex messages
rails runner "Message.search_index.import Message.all"

# 4. Enable feature flag
rails runner "Account.first.enable_features('advanced_search')"

# 5. Test via API or Rails console
```

---

## Checklist

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [x] I have made corresponding changes to the documentation (this PR
description)
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

---

## Additional Notes

### Requirements
- **OpenSearch/Elasticsearch**: Required for advanced message search
  - Set `OPENSEARCH_URL` environment variable
  - Example: `export OPENSEARCH_URL=http://localhost:9200`
- **Feature Flags**:
  - `advanced_search`: Account-level flag for message advanced search
- `search_with_gin` (optional): Account-level flag for GIN-based SQL
search

### Performance Considerations
- 90-day limit prevents expensive long-range queries on large datasets
- GIN indexes recommended for high-volume search on SQL-based resources
- OpenSearch/Elasticsearch provides faster full-text search for messages

### Breaking Changes
- None. All new parameters are optional and backward compatible.

### Frontend Integration
- Frontend PR tracking advanced search UI will consume these endpoints
- Time range pickers should convert JavaScript `Date` to Unix timestamps
(seconds)
- Date conversion: `Math.floor(date.getTime() / 1000)`

### Error Handling
- Invalid `from` parameter format is silently ignored (filter not
applied)
- Time range exceeding 90 days returns `422` with error message
- Missing `q` parameter returns `422` (existing behavior)
- Unauthorized inbox access is filtered out (no error, just excluded
from results)

---------

Co-authored-by: iamsivin <iamsivin@gmail.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Pranav <pranav@chatwoot.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/javascript/dashboard/modules/search/components/SearchHeader.vue

@@ -1,48 +1,34 @@
 <script setup>
-import { ref, useTemplateRef, onMounted, onUnmounted, watch } from 'vue';
-import { debounce } from '@chatwoot/utils';
+import { ref, watch, useTemplateRef, defineModel } from 'vue';
+import { FEATURE_FLAGS } from 'dashboard/featureFlags';
+import { INSTALLATION_TYPES } from 'dashboard/constants/installationTypes';
+import { ROLES } from 'dashboard/constants/permissions';
+
+import SearchInput from './SearchInput.vue';
+import SearchFilters from './SearchFilters.vue';
+import Policy from 'dashboard/components/policy.vue';
 
 const props = defineProps({
-  initialQuery: {
-    type: String,
-    default: '',
-  },
+  initialQuery: { type: String, default: '' },
 });
 
-const emit = defineEmits(['search']);
+const emit = defineEmits(['search', 'filterChange']);
 
+const filters = defineModel('filters', { type: Object, default: () => ({}) });
+
+const searchInputRef = useTemplateRef('searchInputRef');
 const searchQuery = ref(props.initialQuery);
-const isInputFocused = ref(false);
 
-const searchInput = useTemplateRef('searchInput');
-
-const handler = e => {
-  if (e.key === '/' && document.activeElement.tagName !== 'INPUT') {
-    e.preventDefault();
-    searchInput.value.focus();
-  } else if (e.key === 'Escape' && document.activeElement.tagName === 'INPUT') {
-    e.preventDefault();
-    searchInput.value.blur();
+const onSearch = query => {
+  if (query?.trim() && searchInputRef.value) {
+    searchInputRef.value.addToRecentSearches(query.trim());
   }
+  emit('search', query);
 };
 
-const debouncedEmit = debounce(
-  value =>
-    emit('search', value.length > 1 || value.match(/^[0-9]+$/) ? value : ''),
-  500
-);
-
-const onInput = e => {
-  searchQuery.value = e.target.value;
-  debouncedEmit(searchQuery.value);
-};
-
-const onFocus = () => {
-  isInputFocused.value = true;
-};
-
-const onBlur = () => {
-  isInputFocused.value = false;
+const onSelectRecentSearch = query => {
+  searchQuery.value = query;
+  onSearch(query);
 };
 
 watch(
@@ -54,51 +40,30 @@ watch(
   },
   { immediate: true }
 );
-
-onMounted(() => {
-  searchInput.value.focus();
-  document.addEventListener('keydown', handler);
-});
-
-onUnmounted(() => {
-  document.removeEventListener('keydown', handler);
-});
 </script>
 
 <template>
-  <div
-    class="input-container rounded-xl transition-[border-bottom] duration-[0.2s] ease-[ease-in-out] relative flex items-center py-2 px-4 h-14 gap-2 border border-solid bg-n-alpha-black2"
-    :class="{
-      'border-n-brand': isInputFocused,
-      'border-n-weak': !isInputFocused,
-    }"
-  >
-    <div class="flex items-center">
-      <fluent-icon
-        icon="search"
-        class="icon"
-        aria-hidden="true"
-        :class="{
-          'text-n-blue-text': isInputFocused,
-          'text-n-slate-10': !isInputFocused,
-        }"
-      />
-    </div>
-    <input
-      ref="searchInput"
-      type="search"
-      class="reset-base outline-none w-full m-0 bg-transparent border-transparent shadow-none text-n-slate-12 dark:text-n-slate-12 active:border-transparent active:shadow-none hover:border-transparent hover:shadow-none focus:border-transparent focus:shadow-none"
-      :placeholder="$t('SEARCH.INPUT_PLACEHOLDER')"
-      :value="searchQuery"
-      @focus="onFocus"
-      @blur="onBlur"
-      @input="onInput"
-    />
-    <woot-label
-      :title="$t('SEARCH.PLACEHOLDER_KEYBINDING')"
-      :show-close="false"
-      small
-      class="!m-0 whitespace-nowrap !bg-n-slate-3 dark:!bg-n-solid-3 !border-n-weak dark:!border-n-strong"
-    />
+  <div class="flex flex-col gap-2">
+    <SearchInput
+      ref="searchInputRef"
+      v-model="searchQuery"
+      @search="onSearch"
+      @select-recent-search="onSelectRecentSearch"
+    >
+      <Policy
+        :permissions="ROLES"
+        :installation-types="[
+          INSTALLATION_TYPES.ENTERPRISE,
+          INSTALLATION_TYPES.CLOUD,
+        ]"
+        :feature-flag="FEATURE_FLAGS.ADVANCED_SEARCH"
+        class="w-full"
+      >
+        <SearchFilters
+          v-model="filters"
+          @update-filters="$emit('filterChange', $event)"
+        />
+      </Policy>
+    </SearchInput>
   </div>
 </template>