adding new mindforge applications

Mindforge.API/Providers/GeminiApiProvider.cs

@@ -0,0 +1,202 @@
+using System;
+using System.Net.Http;
+using System.Text;
+using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Configuration;
+
+namespace Mindforge.API.Providers
+{
+    public class GeminiApiProvider : ILlmApiProvider
+    {
+        private readonly HttpClient _httpClient;
+        private readonly IConfiguration _configuration;
+        private readonly ILogger<GeminiApiProvider> _logger;
+
+        public GeminiApiProvider(HttpClient httpClient, IConfiguration configuration, ILogger<GeminiApiProvider> logger)
+        {
+            _httpClient = httpClient;
+            _httpClient.Timeout = TimeSpan.FromMinutes(5);
+            _configuration = configuration;
+            _logger = logger;
+        }
+
+        public async Task<string> SendRequestAsync(string systemPrompt, string userPrompt, string model)
+        {
+            var apiKey = _configuration["GEMINI_API_KEY"];
+            if (string.IsNullOrEmpty(apiKey))
+            {
+                throw new Exception("GEMINI_API_KEY not found in configuration.");
+            }
+
+            var apiBase = "https://generativelanguage.googleapis.com/v1beta";
+            var url = $"{apiBase.TrimEnd('/')}/models/{model}:generateContent?key={apiKey}";
+
+            var reqBody = new
+            {
+                system_instruction = string.IsNullOrEmpty(systemPrompt) ? null : new
+                {
+                    parts = new[] { new { text = systemPrompt } }
+                },
+                contents = new[]
+                {
+                    new
+                    {
+                        role = "user",
+                        parts = new[] { new { text = userPrompt } }
+                    }
+                }
+            };
+
+            var jsonBody = JsonSerializer.Serialize(reqBody, new JsonSerializerOptions { DefaultIgnoreCondition = System.Text.Json.Serialization.JsonIgnoreCondition.WhenWritingNull });
+
+            using var request = new HttpRequestMessage(HttpMethod.Post, url);
+            request.Content = new StringContent(jsonBody, Encoding.UTF8, "application/json");
+
+            var response = await _httpClient.SendAsync(request);
+            var responseBody = await response.Content.ReadAsStringAsync();
+
+            if (!response.IsSuccessStatusCode)
+            {
+                throw new Exception($"Gemini API error status {(int)response.StatusCode}: {responseBody}");
+            }
+
+            var result = JsonSerializer.Deserialize<JsonElement>(responseBody);
+            if (result.TryGetProperty("candidates", out var candidates) && candidates.GetArrayLength() > 0)
+            {
+                var content = candidates[0].GetProperty("content");
+                if (content.TryGetProperty("parts", out var parts) && parts.GetArrayLength() > 0)
+                {
+                    return parts[0].GetProperty("text").GetString() ?? string.Empty;
+                }
+            }
+
+            throw new Exception("empty response from Gemini API");
+        }
+
+        public async Task<string> SendRequestBatchAsync(string systemPrompt, string userPrompt, string model)
+        {
+            var apiKey = _configuration["GEMINI_API_KEY"];
+            if (string.IsNullOrEmpty(apiKey))
+                throw new Exception("GEMINI_API_KEY not found in configuration.");
+
+            var apiBase = "https://generativelanguage.googleapis.com/v1beta";
+            var jsonOptions = new JsonSerializerOptions { DefaultIgnoreCondition = System.Text.Json.Serialization.JsonIgnoreCondition.WhenWritingNull };
+
+            // Build single inline request
+            var batchBody = new
+            {
+                batch = new
+                {
+                    display_name = "mindforge-batch",
+                    input_config = new
+                    {
+                        requests = new
+                        {
+                            requests = new[]
+                            {
+                                new
+                                {
+                                    request = new
+                                    {
+                                        system_instruction = string.IsNullOrEmpty(systemPrompt) ? null : new
+                                        {
+                                            parts = new[] { new { text = systemPrompt } }
+                                        },
+                                        contents = new[]
+                                        {
+                                            new
+                                            {
+                                                role = "user",
+                                                parts = new[] { new { text = userPrompt } }
+                                            }
+                                        }
+                                    },
+                                    metadata = new { key = "request-1" }
+                                }
+                            }
+                        }
+                    }
+                }
+            };
+
+            // Submit batch job
+            var createUrl = $"{apiBase}/models/{model}:batchGenerateContent?key={apiKey}";
+            using var createReq = new HttpRequestMessage(HttpMethod.Post, createUrl);
+            createReq.Content = new StringContent(JsonSerializer.Serialize(batchBody, jsonOptions), Encoding.UTF8, "application/json");
+
+            var createResp = await _httpClient.SendAsync(createReq);
+            var createBody = await createResp.Content.ReadAsStringAsync();
+            if (!createResp.IsSuccessStatusCode)
+                throw new Exception($"Gemini Batch API error creating job {(int)createResp.StatusCode}: {createBody}");
+
+            _logger.LogInformation("Gemini Batch API job created");
+
+            var createResult = JsonSerializer.Deserialize<JsonElement>(createBody);
+            if (!createResult.TryGetProperty("name", out var nameEl))
+                throw new Exception("Gemini Batch API did not return a job name.");
+
+            var batchName = nameEl.GetString()!;
+            var pollUrl = $"{apiBase}/{batchName}?key={apiKey}";
+
+            _logger.LogInformation("Gemini Batch API job name: {BatchName}", batchName);
+
+            // Poll until terminal state
+            while (true)
+            {
+                await Task.Delay(TimeSpan.FromSeconds(10));
+
+                using var pollReq = new HttpRequestMessage(HttpMethod.Get, pollUrl);
+                var pollResp = await _httpClient.SendAsync(pollReq);
+                var pollBody = await pollResp.Content.ReadAsStringAsync();
+
+                if (!pollResp.IsSuccessStatusCode)
+                    throw new Exception($"Gemini Batch API error polling status {(int)pollResp.StatusCode}: {pollBody}");
+
+                var pollResult = JsonSerializer.Deserialize<JsonElement>(pollBody);
+                var metadata = pollResult.GetProperty("metadata");
+                var state = metadata.GetProperty("state");
+
+                _logger.LogInformation("Gemini Batch API job state: {State}", state.GetString());
+
+                switch (state.GetString())
+                {
+                    case "BATCH_STATE_SUCCEEDED":
+                        if (pollResult.TryGetProperty("response", out var batchResponse) &&
+                            batchResponse.TryGetProperty("inlinedResponses", out var inlinedResponses) &&
+                            inlinedResponses.TryGetProperty("inlinedResponses", out var inlinedResponsesInternal) &&
+                            inlinedResponsesInternal.GetArrayLength() > 0)
+                        {
+                            _logger.LogInformation("Gemini Batch API job succeeded");
+
+                            var first = inlinedResponsesInternal[0];
+                            if (first.TryGetProperty("error", out var reqError))
+                                throw new Exception($"Gemini Batch request error: {reqError}");
+
+                            if (first.TryGetProperty("response", out var innerResponse) &&
+                                innerResponse.TryGetProperty("candidates", out var candidates) &&
+                                candidates.GetArrayLength() > 0)
+                            {
+                                var content = candidates[0].GetProperty("content");
+                                if (content.TryGetProperty("parts", out var parts) && parts.GetArrayLength() > 0)
+                                    return parts[0].GetProperty("text").GetString() ?? string.Empty;
+                            }
+                        }
+                        throw new Exception("Gemini Batch job succeeded but returned no content.");
+
+                    case "BATCH_STATE_FAILED":
+                        throw new Exception($"Gemini Batch job failed: {pollBody}");
+
+                    case "BATCH_STATE_CANCELLED":
+                        throw new Exception("Gemini Batch job was cancelled.");
+
+                    case "BATCH_STATE_EXPIRED":
+                        throw new Exception("Gemini Batch job expired before completing.");
+
+                    // BATCH_STATE_PENDING / BATCH_STATE_RUNNING — keep polling
+                }
+            }
+        }
+    }
+}