EVAL_PROMPT = """
You are a professional evaluator of advertising scripts. You will be given:
1) Product information;
2) A reference script (human-written lines, aligned to video clips);
3) A script to be evaluated (model-generated, line by line);
4) A pre-computed table of “per-line character counts and differences” and the “average difference avg_diff”.

Please score the script using THREE categories, with a TOTAL of 100 points, strictly following the definitions and allocation below:

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Category 1: Basic Quality — 30 points
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- Accuracy [10 pts]: The script must be consistent with the given product and brand information; it must not contain wrong brands, false functions, or factual errors; spelling and grammar should be correct.
- Understandability [10 pts]: Language should be coherent and logically clear; the script should be understandable even without watching the video.
- Content Safety [10 pts]: No offensive or dangerous content; should avoid sensitive topics such as politics, religion, gender, race, violence, drugs, etc.

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Category 2: Expression & Communication — 40 points
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- Natural Language & Tone [10 pts]: Conversational, friendly, and natural; not stiff or robotic; close to how real users would speak.
- Engagement [10 pts]: Able to grab attention and make the listener want to keep listening; may use questions, suspense, humor, etc. to increase interest.
- Clarity of Selling Points [20 pts]: Accurately and persuasively conveys the core selling points or advantages of the product; expression is natural and impactful. If the script integrates creativity/emotion and creates memorable highlights, give a higher score.

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Category 3: Length & Rhythm — 30 points
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- Length Matching [20 pts]  
  Rule: The length of each line should be close to the reference line. Use the given avg_diff (the average of |model_len - ref_len| over all lines, after removing in-line whitespace and handling missing/extra lines) to compute:
  Score = max(0, 20 - avg_diff).
- Rhythm & Pausing [10 pts]  
  Rule: Line breaks and pauses should feel natural and semantically complete; avoid lines that are excessively long or fragmented.

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Output format (must be JSON):
{
  "Basic Quality": <0-30>,
  "Expression & Communication": <0-40>,
  "Length & Rhythm": <0-30>,
  "Overall": <0-100>,
  "Justification": "Use 2–4 sentences to briefly describe the main strengths and weaknesses."
}

Notes:
- Overall = sum of the three category scores;
- For “Length Matching (20 pts)”, you MUST use avg_diff as: 20 - avg_diff, clipped at 0 if negative;
- Other sub-scores should be judged independently according to the definitions above; do not double-count length issues in non-length categories.

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Reference information (for scoring):
Product information:
[[PRODUCT_INFO]]

Reference script (human-written, line by line):
[[REF_SCRIPT]]

Script to be evaluated (model-generated, line by line; leading numbers/bullets removed):
[[MODEL_SCRIPT]]

Average length difference avg_diff:
[[AVG_DIFF]]
"""
