use async_trait::async_trait;
use serde::{Deserialize, Serialize};
use uuid::Uuid;

use crate::error::AppResult;

/// 健康数据提供者 trait，由 erp-health 实现
/// 返回的 DTO 已脱去 PII（姓名、身份证号等），只包含年龄/性别/医疗数据
#[async_trait]
pub trait HealthDataProvider: Send + Sync {
    /// 获取化验报告（指标列表）
    async fn get_lab_report(&self, tenant_id: Uuid, report_id: Uuid) -> AppResult<LabReportDto>;

    /// 获取生命体征趋势数据
    async fn get_vital_signs(
        &self,
        tenant_id: Uuid,
        patient_id: Uuid,
        metrics: &[String],
        range: &TimeRange,
    ) -> AppResult<Vec<VitalSignDto>>;

    /// 获取患者摘要（用于个性化方案）
    async fn get_patient_summary(
        &self,
        tenant_id: Uuid,
        patient_id: Uuid,
    ) -> AppResult<PatientSummaryDto>;

    /// 获取完整健康报告（用于摘要生成）
    async fn get_full_report(&self, tenant_id: Uuid, report_id: Uuid)
    -> AppResult<HealthReportDto>;

    /// 获取趋势分析预计算数据（统计摘要 + 异常检测）
    async fn get_trend_analysis_data(
        &self,
        tenant_id: Uuid,
        patient_id: Uuid,
        metrics: &[String],
        range: &TimeRange,
    ) -> AppResult<TrendAnalysisDto>;
}

// === DTO 定义 ===

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TimeRange {
    pub start: chrono::DateTime<chrono::Utc>,
    pub end: chrono::DateTime<chrono::Utc>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LabReportDto {
    pub age_group: String,
    pub sex: String,
    pub department: String,
    pub report_date: String,
    pub items: Vec<LabItemDto>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LabItemDto {
    pub name: String,
    pub value: f64,
    pub unit: String,
    pub reference_range: String,
    pub is_abnormal: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct VitalSignDto {
    pub metric: String,
    pub values: Vec<(String, f64)>,
    pub unit: String,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PatientSummaryDto {
    pub age_group: String,
    pub sex: String,
    pub chronic_conditions: Vec<String>,
    pub medications: Vec<String>,
    pub family_history: Vec<String>,
    pub last_checkup_date: String,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HealthReportDto {
    pub age_group: String,
    pub sex: String,
    pub department: String,
    pub report_date: String,
    pub sections: Vec<ReportSectionDto>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ReportSectionDto {
    pub title: String,
    pub findings: Vec<String>,
    pub abnormal_items: Vec<String>,
}

// === 趋势分析 DTO ===

/// 趋势方向
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum TrendDirection {
    Rising,
    Falling,
    Stable,
}

/// 趋势分析整体 DTO
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TrendAnalysisDto {
    pub patient_id: Uuid,
    pub period_start: String,
    pub period_end: String,
    pub metrics: Vec<MetricTrendAnalysis>,
}

/// 单个指标的趋势分析结果
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MetricTrendAnalysis {
    pub metric: String,
    pub unit: String,
    pub data_point_count: usize,
    /// 线性回归统计（数据不足时为 None）
    pub regression: Option<RegressionStats>,
    /// 检测到的异常点
    pub anomalies: Vec<AnomalyInfo>,
}

/// 线性回归统计摘要
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RegressionStats {
    pub slope: f64,
    pub intercept: f64,
    pub r_squared: f64,
    pub direction: TrendDirection,
    pub daily_change: f64,
    pub period_change: f64,
}

/// 异常点信息
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AnomalyInfo {
    pub date: String,
    pub value: f64,
    pub mean: f64,
    pub std_dev: f64,
    pub deviation: f64,
}