feat: UI to show the SLA threshold in chat screen (#9146)

- UI will show the breach in the conversation list.
- UI will show the breach in the conversation header.

Fixes: https://linear.app/chatwoot/issue/CW-3146/update-the-ui-to-show-the-breach-in-the-conversation-list
Fixes: https://linear.app/chatwoot/issue/CW-3144/ui-update-to-show-the-breachgoing-to-breach

app/javascript/dashboard/components/widgets/conversation/helpers/specs/SLAHelper.spec.js

@@ -0,0 +1,150 @@
+import { evaluateSLAStatus } from '../SLAHelper';
+
+beforeEach(() => {
+  jest
+    .spyOn(Date, 'now')
+    .mockImplementation(() => new Date('2024-01-01T00:00:00Z').getTime());
+});
+
+afterEach(() => {
+  jest.restoreAllMocks();
+});
+
+describe('SLAHelper', () => {
+  describe('evaluateSLAStatus', () => {
+    it('returns an empty object when sla or chat is not present', () => {
+      expect(evaluateSLAStatus(null, null)).toEqual({
+        type: '',
+        threshold: '',
+        icon: '',
+        isSlaMissed: false,
+      });
+    });
+
+    // Case when FRT SLA is missed
+    it('correctly identifies a missed FRT SLA', () => {
+      const appliedSla = {
+        sla_first_response_time_threshold: 600,
+        sla_next_response_time_threshold: 1200,
+        sla_resolution_time_threshold: 1800,
+        created_at: 1704066540,
+      };
+      const chatMissed = {
+        first_reply_created_at: 0,
+        waiting_since: 0,
+        status: 'open',
+      };
+      expect(evaluateSLAStatus(appliedSla, chatMissed)).toEqual({
+        type: 'FRT',
+        threshold: '1m',
+        icon: 'flame',
+        isSlaMissed: true,
+      });
+    });
+
+    // Case when FRT SLA is not missed
+    it('correctly identifies an FRT SLA not yet breached', () => {
+      const appliedSla = {
+        sla_first_response_time_threshold: 600,
+        sla_next_response_time_threshold: 1200,
+        sla_resolution_time_threshold: 1800,
+        created_at: 1704066660,
+      };
+      const chatNotMissed = {
+        first_reply_created_at: 0,
+        waiting_since: 0,
+        status: 'open',
+      };
+      expect(evaluateSLAStatus(appliedSla, chatNotMissed)).toEqual({
+        type: 'FRT',
+        threshold: '1m',
+        icon: 'alarm',
+        isSlaMissed: false,
+      });
+    });
+
+    // Case when NRT SLA is missed
+    it('correctly identifies a missed NRT SLA', () => {
+      const appliedSla = {
+        sla_first_response_time_threshold: 600,
+        sla_next_response_time_threshold: 1200,
+        sla_resolution_time_threshold: 1800,
+        created_at: 1704065200,
+      };
+      const chatMissed = {
+        first_reply_created_at: 1704066200,
+        waiting_since: 1704065940,
+        status: 'open',
+      };
+      expect(evaluateSLAStatus(appliedSla, chatMissed)).toEqual({
+        type: 'NRT',
+        threshold: '1m',
+        icon: 'flame',
+        isSlaMissed: true,
+      });
+    });
+
+    // Case when NRT SLA is not missed
+    it('correctly identifies an NRT SLA not yet breached', () => {
+      const appliedSla = {
+        sla_first_response_time_threshold: 600,
+        sla_next_response_time_threshold: 1200,
+        sla_resolution_time_threshold: 1800,
+        created_at: 1704065200 - 2000,
+      };
+      const chatNotMissed = {
+        first_reply_created_at: 1704066200,
+        waiting_since: 1704066060,
+        status: 'open',
+      };
+      expect(evaluateSLAStatus(appliedSla, chatNotMissed)).toEqual({
+        type: 'NRT',
+        threshold: '1m',
+        icon: 'alarm',
+        isSlaMissed: false,
+      });
+    });
+
+    // Case when RT SLA is missed
+    it('correctly identifies a missed RT SLA', () => {
+      const appliedSla = {
+        sla_first_response_time_threshold: 600,
+        sla_next_response_time_threshold: 1200,
+        sla_resolution_time_threshold: 1800,
+        created_at: 1704065340,
+      };
+      const chatMissed = {
+        first_reply_created_at: 1704066200,
+        waiting_since: 0,
+        status: 'open',
+      };
+      expect(evaluateSLAStatus(appliedSla, chatMissed)).toEqual({
+        type: 'RT',
+        threshold: '1m',
+        icon: 'flame',
+        isSlaMissed: true,
+      });
+    });
+
+    // Case when RT SLA is not missed
+    it('correctly identifies an RT SLA not yet breached', () => {
+      const appliedSla = {
+        sla_first_response_time_threshold: 600,
+        sla_next_response_time_threshold: 1200,
+        sla_resolution_time_threshold: 1800,
+        created_at: 1704065460,
+      };
+      const chatNotMissed = {
+        first_reply_created_at: 1704066200,
+        waiting_since: 0,
+        status: 'open',
+      };
+      expect(evaluateSLAStatus(appliedSla, chatNotMissed)).toEqual({
+        type: 'RT',
+        threshold: '1m',
+        icon: 'alarm',
+        isSlaMissed: false,
+      });
+    });
+  });
+});