export async function generateText()

in src/video_toys/lib/textGeneration.ts [56:141]
71 lines of code
11 McCabe index (conditional complexity)

export async function generateText(
  options: GenerateTextOptions,
): Promise<string> {
  const {
    modelName,
    prompt,
    videoUrl,
    temperature = 0.75,
    safetySettings = DEFAULT_SAFETY_SETTINGS,
  } = options;

  if (!GEMINI_API_KEY) {
    throw new Error('Gemini API key is missing or empty');
  }

  const ai = new GoogleGenAI({apiKey: GEMINI_API_KEY});

  const parts: Part[] = [{text: prompt}];

  if (videoUrl) {
    try {
      parts.push({
        fileData: {
          mimeType: 'video/mp4',
          fileUri: videoUrl,
        },
      });
    } catch (error) {
      console.error('Error processing video input:', error);
      throw new Error(`Failed to process video input from URL: ${videoUrl}`);
    }
  }

  const generationConfig: GenerateContentConfig = {
    temperature,
    safetySettings,
  };

  const request: GenerateContentParameters = {
    model: modelName,
    contents: [{role: 'user', parts}],
    config: generationConfig,
  };

  try {
    const response = await ai.models.generateContent(request);

    // Check for prompt blockage
    if (response.promptFeedback?.blockReason) {
      throw new Error(
        `Content generation failed: Prompt blocked (reason: ${response.promptFeedback.blockReason})`,
      );
    }

    // Check for response blockage
    if (!response.candidates || response.candidates.length === 0) {
      throw new Error('Content generation failed: No candidates returned.');
    }

    const firstCandidate = response.candidates[0];

    // Check for finish reasons other than STOP
    if (
      firstCandidate.finishReason &&
      firstCandidate.finishReason !== FinishReason.STOP
    ) {
      if (firstCandidate.finishReason === FinishReason.SAFETY) {
        throw new Error(
          'Content generation failed: Response blocked due to safety settings.',
        );
      } else {
        throw new Error(
          `Content generation failed: Stopped due to ${firstCandidate.finishReason}.`,
        );
      }
    }

    return response.text;
  } catch (error) {
    console.error(
      'An error occurred during Gemini API call or response processing:',
      error,
    );
    throw error;
  }
}