//! 技能生成器
//! 将聚合的经验模式通过 LLM 转化为 SKILL.md 内容
//! 提供 prompt 构建和 JSON 结果解析

use crate::pattern_aggregator::AggregatedPattern;
use zclaw_types::Result;

/// 技能候选项
#[derive(Debug, Clone)]
pub struct SkillCandidate {
    pub name: String,
    pub description: String,
    pub triggers: Vec<String>,
    pub tools: Vec<String>,
    pub body_markdown: String,
    pub source_pattern: String,
    pub confidence: f32,
    /// 技能版本号，用于后续迭代追踪
    pub version: u32,
}

/// LLM 驱动的技能生成 prompt
const SKILL_GENERATION_PROMPT: &str = r#"
你是一个技能设计专家。根据以下用户反复出现的问题和解决步骤，生成一个可复用的技能定义。

问题模式：{pain_pattern}
解决步骤：{steps}
使用的工具：{tools}
行业背景：{industry}

请生成以下 JSON：
```json
{
  "name": "技能名称（简短中文）",
  "description": "技能描述（一段话）",
  "triggers": ["触发词1", "触发词2", "触发词3"],
  "tools": ["tool1", "tool2"],
  "body_markdown": "技能的 Markdown 正文，包含步骤说明",
  "confidence": 0.85
}
```
"#;

/// 技能生成器
/// 负责 prompt 构建和 LLM 返回的 JSON 解析
pub struct SkillGenerator;

impl SkillGenerator {
    pub fn new() -> Self {
        Self
    }

    /// 从聚合模式构建 LLM prompt
    pub fn build_prompt(pattern: &AggregatedPattern) -> String {
        SKILL_GENERATION_PROMPT
            .replace("{pain_pattern}", &pattern.pain_pattern)
            .replace("{steps}", &pattern.common_steps.join(" → "))
            .replace("{tools}", &pattern.tools_used.join(", "))
            .replace("{industry}", pattern.industry_context.as_deref().unwrap_or("通用"))
    }

    /// 解析 LLM 返回的 JSON 为 SkillCandidate
    pub fn parse_response(json_str: &str, pattern: &AggregatedPattern) -> Result<SkillCandidate> {
        let json_str = crate::json_utils::extract_json_block(json_str);

        let raw: serde_json::Value = serde_json::from_str(&json_str).map_err(|e| {
            zclaw_types::ZclawError::ConfigError(format!("Invalid skill JSON: {}", e))
        })?;

        Ok(SkillCandidate {
            name: raw["name"]
                .as_str()
                .unwrap_or("未命名技能")
                .to_string(),
            description: raw["description"].as_str().unwrap_or("").to_string(),
            triggers: crate::json_utils::extract_string_array(&raw, "triggers"),
            tools: crate::json_utils::extract_string_array(&raw, "tools"),
            body_markdown: raw["body_markdown"].as_str().unwrap_or("").to_string(),
            source_pattern: pattern.pain_pattern.clone(),
            confidence: raw["confidence"].as_f64().unwrap_or(0.5) as f32,
            version: raw["version"].as_u64().unwrap_or(1) as u32,
        })
    }
}

impl Default for SkillGenerator {
    fn default() -> Self {
        Self::new()
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::experience_store::Experience;

    fn make_pattern() -> AggregatedPattern {
        let exp = Experience::new(
            "agent-1",
            "报表生成",
            "researcher",
            vec!["查询数据库".into(), "格式化输出".into()],
            "success",
        );
        AggregatedPattern {
            pain_pattern: "报表生成".to_string(),
            experiences: vec![exp],
            common_steps: vec!["查询数据库".into(), "格式化输出".into()],
            total_reuse: 5,
            tools_used: vec!["researcher".into()],
            industry_context: Some("healthcare".into()),
        }
    }

    #[test]
    fn test_build_prompt() {
        let pattern = make_pattern();
        let prompt = SkillGenerator::build_prompt(&pattern);
        assert!(prompt.contains("报表生成"));
        assert!(prompt.contains("查询数据库"));
        assert!(prompt.contains("researcher"));
        assert!(prompt.contains("healthcare"));
    }

    #[test]
    fn test_parse_response_valid_json() {
        let pattern = make_pattern();
        let json = r##"{"name":"每日报表","description":"生成每日报表","triggers":["报表","日报"],"tools":["researcher"],"body_markdown":"# 每日报表\n步骤1","confidence":0.9}"##;
        let candidate = SkillGenerator::parse_response(json, &pattern).unwrap();
        assert_eq!(candidate.name, "每日报表");
        assert_eq!(candidate.triggers.len(), 2);
        assert_eq!(candidate.confidence, 0.9);
        assert_eq!(candidate.source_pattern, "报表生成");
    }

    #[test]
    fn test_parse_response_json_block() {
        let pattern = make_pattern();
        let text = r#"```json
{"name":"技能A","description":"desc","triggers":["a"],"tools":[],"body_markdown":"body","confidence":0.8}
```"#;
        let candidate = SkillGenerator::parse_response(text, &pattern).unwrap();
        assert_eq!(candidate.name, "技能A");
    }

    #[test]
    fn test_parse_response_invalid_json() {
        let pattern = make_pattern();
        let result = SkillGenerator::parse_response("not json at all", &pattern);
        assert!(result.is_err());
    }

    #[test]
    fn test_extract_json_block_with_markdown() {
        let text = "Here is the result:\n```json\n{\"key\": \"value\"}\n```\nDone.";
        assert_eq!(crate::json_utils::extract_json_block(text), "{\"key\": \"value\"}");
    }

    #[test]
    fn test_extract_json_block_bare() {
        let text = "{\"key\": \"value\"}";
        assert_eq!(crate::json_utils::extract_json_block(text), "{\"key\": \"value\"}");
    }
}