//! 用户画像增量更新器
//! 从 CombinedExtraction 的 profile_signals 提取需要更新的字段
//! 不额外调用 LLM，纯规则驱动

use crate::types::CombinedExtraction;

/// 更新类型：字段覆盖 vs 数组追加
#[derive(Debug, Clone, PartialEq)]
pub enum ProfileUpdateKind {
    /// 直接覆盖字段值（industry, communication_style）
    SetField,
    /// 追加到 JSON 数组字段（recent_topic, pain_point, preferred_tool）
    AppendArray,
}

/// 待更新的画像字段
#[derive(Debug, Clone, PartialEq)]
pub struct ProfileFieldUpdate {
    pub field: String,
    pub value: String,
    pub kind: ProfileUpdateKind,
}

/// 用户画像更新器
/// 从 CombinedExtraction 的 profile_signals 中提取需更新的字段列表
/// 调用方（zclaw-runtime）负责实际写入 UserProfileStore
pub struct UserProfileUpdater;

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

    /// 从提取结果中收集需要更新的画像字段
    /// 返回 (field, value, kind) 列表，由调用方根据 kind 选择写入方式
    pub fn collect_updates(
        &self,
        extraction: &CombinedExtraction,
    ) -> Vec<ProfileFieldUpdate> {
        let signals = &extraction.profile_signals;
        let mut updates = Vec::new();

        if let Some(ref industry) = signals.industry {
            updates.push(ProfileFieldUpdate {
                field: "industry".to_string(),
                value: industry.clone(),
                kind: ProfileUpdateKind::SetField,
            });
        }

        if let Some(ref style) = signals.communication_style {
            updates.push(ProfileFieldUpdate {
                field: "communication_style".to_string(),
                value: style.clone(),
                kind: ProfileUpdateKind::SetField,
            });
        }

        if let Some(ref topic) = signals.recent_topic {
            updates.push(ProfileFieldUpdate {
                field: "recent_topic".to_string(),
                value: topic.clone(),
                kind: ProfileUpdateKind::AppendArray,
            });
        }

        if let Some(ref pain) = signals.pain_point {
            updates.push(ProfileFieldUpdate {
                field: "pain_point".to_string(),
                value: pain.clone(),
                kind: ProfileUpdateKind::AppendArray,
            });
        }

        if let Some(ref tool) = signals.preferred_tool {
            updates.push(ProfileFieldUpdate {
                field: "preferred_tool".to_string(),
                value: tool.clone(),
                kind: ProfileUpdateKind::AppendArray,
            });
        }

        updates
    }
}

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

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

    #[test]
    fn test_collect_updates_industry() {
        let mut extraction = CombinedExtraction::default();
        extraction.profile_signals.industry = Some("healthcare".to_string());

        let updater = UserProfileUpdater::new();
        let updates = updater.collect_updates(&extraction);

        assert_eq!(updates.len(), 1);
        assert_eq!(updates[0].field, "industry");
        assert_eq!(updates[0].value, "healthcare");
        assert_eq!(updates[0].kind, ProfileUpdateKind::SetField);
    }

    #[test]
    fn test_collect_updates_no_signals() {
        let extraction = CombinedExtraction::default();
        let updater = UserProfileUpdater::new();
        let updates = updater.collect_updates(&extraction);
        assert!(updates.is_empty());
    }

    #[test]
    fn test_collect_updates_multiple_signals() {
        let mut extraction = CombinedExtraction::default();
        extraction.profile_signals.industry = Some("ecommerce".to_string());
        extraction.profile_signals.communication_style = Some("concise".to_string());

        let updater = UserProfileUpdater::new();
        let updates = updater.collect_updates(&extraction);

        assert_eq!(updates.len(), 2);
    }

    #[test]
    fn test_collect_updates_all_five_dimensions() {
        let mut extraction = CombinedExtraction::default();
        extraction.profile_signals.industry = Some("healthcare".to_string());
        extraction.profile_signals.communication_style = Some("concise".to_string());
        extraction.profile_signals.recent_topic = Some("报表自动化".to_string());
        extraction.profile_signals.pain_point = Some("手动汇总太慢".to_string());
        extraction.profile_signals.preferred_tool = Some("researcher".to_string());

        let updater = UserProfileUpdater::new();
        let updates = updater.collect_updates(&extraction);

        assert_eq!(updates.len(), 5);
        let set_fields: Vec<_> = updates
            .iter()
            .filter(|u| u.kind == ProfileUpdateKind::SetField)
            .map(|u| u.field.as_str())
            .collect();
        let append_fields: Vec<_> = updates
            .iter()
            .filter(|u| u.kind == ProfileUpdateKind::AppendArray)
            .map(|u| u.field.as_str())
            .collect();
        assert_eq!(set_fields, vec!["industry", "communication_style"]);
        assert_eq!(append_fields, vec!["recent_topic", "pain_point", "preferred_tool"]);
    }
}