Use Ollama rewrite path for CV generation

JobTrackerApi/Services/SummarizerService.cs

@@ -153,8 +153,7 @@ namespace JobTrackerApi.Services
         public Task<string?> SummarizeSectionAsync(string instruction, string text, int maxLength = 180, int minLength = 40)
         {
             if (string.IsNullOrWhiteSpace(instruction) || string.IsNullOrWhiteSpace(text)) return Task.FromResult<string?>(null);
-            var composed = ComposeBoundedPrompt(instruction.Trim(), text.Trim());
-            return SummarizeCoreAsync(composed, maxLength, minLength);
+            return RewriteCoreAsync(instruction.Trim(), text.Trim(), maxLength, minLength);
         }
 
         private static string ComposeBoundedPrompt(string instruction, string text)
@@ -174,6 +173,95 @@ namespace JobTrackerApi.Services
             return prefix + text[..remaining];
         }
 
+        private async Task<string?> RewriteCoreAsync(string instruction, string text, int maxLength, int minLength)
+        {
+            var normalizedMaxLength = Math.Clamp(maxLength, AiServiceMinSummaryLength, AiServiceMaxSummaryLength);
+            var normalizedMinLength = Math.Clamp(minLength, AiServiceMinMinLength, AiServiceMaxMinLength);
+            if (normalizedMinLength >= normalizedMaxLength)
+            {
+                normalizedMinLength = Math.Max(AiServiceMinMinLength, normalizedMaxLength - 1);
+            }
+
+            var composed = ComposeBoundedPrompt(instruction, text);
+            var key = BuildCacheKey($"rewrite::{composed}", normalizedMaxLength, normalizedMinLength);
+            Interlocked.Increment(ref _requests);
+
+            if (_cache.TryGetValue<string>(key, out var cached))
+            {
+                Interlocked.Increment(ref _cacheHits);
+                lock (_metricsLock)
+                {
+                    _lastSuccessAt = DateTimeOffset.UtcNow;
+                    _lastError = null;
+                }
+                return cached;
+            }
+
+            Interlocked.Increment(ref _cacheMisses);
+
+            var client = _httpFactory.CreateClient("ai-service");
+            var payload = JsonSerializer.Serialize(new
+            {
+                instruction,
+                text,
+                max_length = normalizedMaxLength,
+                min_length = normalizedMinLength,
+            });
+            using var content = new StringContent(payload, Encoding.UTF8, "application/json");
+            var sw = Stopwatch.StartNew();
+
+            try
+            {
+                var res = await client.PostAsync("/cv/rewrite", content);
+                sw.Stop();
+                Interlocked.Add(ref _totalLatencyTicks, sw.ElapsedTicks);
+                if (!res.IsSuccessStatusCode)
+                {
+                    var errorBody = await ReadErrorBodyAsync(res);
+                    Interlocked.Increment(ref _failures);
+                    lock (_metricsLock)
+                    {
+                        _lastFailureAt = DateTimeOffset.UtcNow;
+                        _lastError = $"AI rewrite failed: {errorBody}";
+                    }
+                    return null;
+                }
+
+                using var stream = await res.Content.ReadAsStreamAsync();
+                using var doc = await JsonDocument.ParseAsync(stream);
+                if (doc.RootElement.TryGetProperty("rewritten_text", out var el))
+                {
+                    var s = el.GetString();
+                    if (!string.IsNullOrWhiteSpace(s)) _cache.Set(key, s, TimeSpan.FromHours(6));
+                    lock (_metricsLock)
+                    {
+                        _lastSuccessAt = DateTimeOffset.UtcNow;
+                        _lastError = null;
+                    }
+                    return s;
+                }
+
+                lock (_metricsLock)
+                {
+                    _lastFailureAt = DateTimeOffset.UtcNow;
+                    _lastError = "AI rewrite failed: response did not contain rewritten_text.";
+                }
+                return null;
+            }
+            catch (Exception ex)
+            {
+                sw.Stop();
+                Interlocked.Add(ref _totalLatencyTicks, sw.ElapsedTicks);
+                Interlocked.Increment(ref _failures);
+                lock (_metricsLock)
+                {
+                    _lastFailureAt = DateTimeOffset.UtcNow;
+                    _lastError = ex.Message;
+                }
+                return null;
+            }
+        }
+
         private async Task<string?> SummarizeCoreAsync(string text, int maxLength, int minLength)
         {
             var normalizedMaxLength = Math.Clamp(maxLength, AiServiceMinSummaryLength, AiServiceMaxSummaryLength);