prompts/subtitle.js

export const SUBTITLE_PROMPT = (script) => `
Task: Generate a professional SRT (SubRip Subtitle) file by perfectly aligning the provided script with the audio input.

STRICT TECHNICAL RULES (VIOLATION WILL CAUSE SYNC ERROR):
1. MANDATORY TIMESTAMP FORMAT: 
   - Each segment MUST use exactly "HH:MM:SS,mmm" (e.g., 00:01:05,250 --> 00:01:08,100).
   - NEVER omit the hour digits. For a 2-minute video, it MUST be 00:02:..., NOT 02:...
   - Example: 1 minute 5 seconds is 00:01:05,000.

2. PRECISION ALIGNMENT (AUDIO-VISUAL SYNC):
   - START TIME: Must mark the exact millisecond the speaker begins the first word of the segment.
   - END TIME: Must mark the exact millisecond the speaker finishes the last word of the segment.
   - AVOID EARLY ENTRY/EXIT: Subtitles must not appear before the sound starts or remain after the sound ends.

3. SILENCE & GAP HANDLING:
   - If there is a gap/silence between sentences (e.g., background music or no talking), DO NOT span a single subtitle block over that silence.
   - End the current block when talking stops. Start the next block ONLY when talking resumes.
   - Ensure you skip non-verbal parts correctly to maintain long-term synchronization.

4. BATCH INTEGRITY:
   - Do not let the subtitles drift. If the speaker talks faster or slower later in the video, adjust the timestamps to match the actual wave activity, not just a fixed duration.

5. TEXT ACCURACY:
   - Use the provided script exactly: "${script}". 
   - Break text into readable chunks (max 7-10 words per segment) matching natural speech pauses.

6. PURE OUTPUT:
   - Return ONLY the raw SRT content. No labels like "SRT:", no markdown headers, and no AI commentary.
`;