refactor: extract platform media crates

server-rs/crates/platform-image/src/generated_asset_sheets/prompt.rs

@@ -0,0 +1,65 @@
+use super::error::GeneratedAssetSheetError;
+
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct GeneratedAssetSheetPromptInput<'a> {
+    pub subject_text: &'a str,
+    pub item_names: &'a [String],
+    pub grid_size: usize,
+    pub item_name_prompt_template: Option<&'a str>,
+    pub special_prompt: Option<&'a str>,
+}
+
+pub fn build_generated_asset_sheet_prompt(
+    input: &GeneratedAssetSheetPromptInput<'_>,
+) -> Result<String, GeneratedAssetSheetError> {
+    let grid_size = input.grid_size;
+    if grid_size == 0 {
+        return Err(GeneratedAssetSheetError::invalid_request(
+            "系列素材图集的 n 必须大于 0。",
+        ));
+    }
+    if input.item_names.len() > grid_size {
+        return Err(GeneratedAssetSheetError::invalid_request(format!(
+            "系列素材图集的物品行数不能超过 n。gridSize={grid_size}, itemCount={}",
+            input.item_names.len()
+        )));
+    }
+
+    let subject_text = input.subject_text.trim();
+    let subject_text = if subject_text.is_empty() {
+        "系列素材"
+    } else {
+        subject_text
+    };
+    let item_rows = input
+        .item_names
+        .iter()
+        .enumerate()
+        .map(|(index, item_name)| {
+            let row_index = index + 1;
+            let item_name = item_name.trim();
+            if let Some(template) = input
+                .item_name_prompt_template
+                .map(str::trim)
+                .filter(|value| !value.is_empty())
+            {
+                return template
+                    .replace("{row_index}", row_index.to_string().as_str())
+                    .replace("{item_name}", item_name)
+                    .replace("{view_count}", grid_size.to_string().as_str());
+            }
+            format!("第{row_index}行：{item_name} 的 {grid_size} 个不同视图")
+        })
+        .collect::<Vec<_>>()
+        .join("；");
+    let special_prompt = input
+        .special_prompt
+        .map(str::trim)
+        .filter(|value| !value.is_empty())
+        .map(str::to_string)
+        .unwrap_or_else(|| format!("每个物品生成 {grid_size} 个不同视图。"));
+
+    Ok(format!(
+        "生成一张1:1图片。固定生成{grid_size}行*{grid_size}列网格素材图，画面是{subject_text}。严格{grid_size}*{grid_size}均匀排布，严格按行组织：{item_rows}。{special_prompt}每个格子一个独立居中的完整素材，每格背景必须是统一纯绿色绿幕背景（高饱和亮绿色，接近 #00FF00），背景平整无纹理、无渐变、无阴影、无道具，方便后续抠成透明。素材本身不得使用与绿幕相同的纯绿色；若素材天然含绿色，必须使用更深、更黄或更蓝的绿色并用清晰描边与绿幕区分。统一柔和光照，清晰轮廓，适合直接切割成游戏2D素材。请让每个素材完整落在自己的格子中央，四周保留留白，相邻素材主体之间必须至少保留单个素材格宽度的1/4空白间距（约25%单格宽度），包含左右相邻格和上下相邻行，素材主体不得占满格子。禁止主体跨格、贴边或越界，禁止任何内容进入相邻格子影响裁剪后的效果。不要出现文字、水印、UI、边框、网格线、标签、底座、场景或其他物体。"
+    ))
+}