use sea_orm::{ColumnTrait, EntityTrait, PaginatorTrait, QueryFilter, sea_query::Expr, FromQueryResult};

use erp_core::error::AppResult;

use crate::dto::stats_dto::*;
use crate::entity::{
    patient, consultation_session, follow_up_task,
    points_transaction, dialysis_record, lab_report,
    appointment, vital_signs, patient_doctor_relation, doctor_profile,
};
use crate::state::HealthState;

// ---------------------------------------------------------------------------
// 基础运营统计
// ---------------------------------------------------------------------------

pub async fn get_patient_statistics(
    state: &HealthState,
    tenant_id: uuid::Uuid,
) -> AppResult<PatientStatisticsResp> {
    let db = &state.db;

    let total = patient::Entity::find()
        .filter(patient::Column::TenantId.eq(tenant_id))
        .filter(patient::Column::DeletedAt.is_null())
        .count(db)
        .await?;

    let new_this_month = patient::Entity::find()
        .filter(patient::Column::TenantId.eq(tenant_id))
        .filter(patient::Column::DeletedAt.is_null())
        .filter(Expr::col(patient::Column::CreatedAt).gte(Expr::cust("date_trunc('month', NOW())")))
        .count(db)
        .await?;

    let new_this_week = patient::Entity::find()
        .filter(patient::Column::TenantId.eq(tenant_id))
        .filter(patient::Column::DeletedAt.is_null())
        .filter(Expr::col(patient::Column::CreatedAt).gte(Expr::cust("date_trunc('week', NOW())")))
        .count(db)
        .await?;

    let active_this_month = points_transaction::Entity::find()
        .filter(points_transaction::Column::TenantId.eq(tenant_id))
        .filter(Expr::col(points_transaction::Column::CreatedAt).gte(Expr::cust("date_trunc('month', NOW())")))
        .count(db)
        .await?;

    Ok(PatientStatisticsResp {
        total_patients: total as i64,
        new_this_month: new_this_month as i64,
        new_this_week: new_this_week as i64,
        active_this_month: active_this_month as i64,
    })
}

pub async fn get_consultation_statistics(
    state: &HealthState,
    tenant_id: uuid::Uuid,
) -> AppResult<ConsultationStatisticsResp> {
    let db = &state.db;

    let total_sessions = consultation_session::Entity::find()
        .filter(consultation_session::Column::TenantId.eq(tenant_id))
        .filter(consultation_session::Column::DeletedAt.is_null())
        .count(db)
        .await?;

    let pending_reply = consultation_session::Entity::find()
        .filter(consultation_session::Column::TenantId.eq(tenant_id))
        .filter(consultation_session::Column::DeletedAt.is_null())
        .filter(consultation_session::Column::Status.eq("waiting"))
        .count(db)
        .await?;

    let this_month = consultation_session::Entity::find()
        .filter(consultation_session::Column::TenantId.eq(tenant_id))
        .filter(consultation_session::Column::DeletedAt.is_null())
        .filter(Expr::col(consultation_session::Column::CreatedAt).gte(Expr::cust("date_trunc('month', NOW())")))
        .count(db)
        .await?;

    let avg_response_time_minutes = compute_avg_response_time(db, tenant_id).await?;

    Ok(ConsultationStatisticsResp {
        total_sessions: total_sessions as i64,
        pending_reply: pending_reply as i64,
        avg_response_time_minutes,
        this_month: this_month as i64,
    })
}

pub async fn get_follow_up_statistics(
    state: &HealthState,
    tenant_id: uuid::Uuid,
) -> AppResult<FollowUpStatisticsResp> {
    let db = &state.db;

    // 单次 GROUP BY 查询替代 4 次独立 COUNT
    let sql = r#"
        SELECT COALESCE(status, '__total') AS status, COUNT(*) AS cnt
        FROM follow_up_task
        WHERE tenant_id = $1 AND deleted_at IS NULL
        GROUP BY GROUPING SETS ((status), ())
    "#;

    #[derive(Debug, sea_orm::FromQueryResult)]
    struct StatusCount {
        status: String,
        cnt: i64,
    }

    let rows: Vec<StatusCount> = sea_orm::FromQueryResult::find_by_statement(
        sea_orm::Statement::from_sql_and_values(
            sea_orm::DatabaseBackend::Postgres,
            sql,
            [tenant_id.into()],
        ),
    )
    .all(db)
    .await?;

    let mut total_tasks: i64 = 0;
    let mut completed: i64 = 0;
    let mut pending: i64 = 0;
    let mut overdue: i64 = 0;

    for row in &rows {
        match row.status.as_str() {
            "__total" => total_tasks = row.cnt,
            "completed" => completed = row.cnt,
            "pending" => pending = row.cnt,
            "overdue" => overdue = row.cnt,
            _ => {}
        }
    }

    let completion_rate = if completed + pending + overdue > 0 {
        (completed as f64 / (completed + pending + overdue) as f64) * 100.0
    } else {
        0.0
    };

    Ok(FollowUpStatisticsResp {
        total_tasks,
        completed,
        pending,
        overdue,
        completion_rate,
    })
}

#[derive(Debug, FromQueryResult)]
struct AvgResponseTime {
    avg_minutes: Option<f64>,
}

async fn compute_avg_response_time(
    db: &sea_orm::DatabaseConnection,
    tenant_id: uuid::Uuid,
) -> AppResult<Option<f64>> {
    let sql = r#"
        SELECT AVG(EXTRACT(EPOCH FROM (m.created_at - s.created_at)) / 60) AS avg_minutes
        FROM consultation_session s
        INNER JOIN consultation_message m ON m.session_id = s.id AND m.tenant_id = $1 AND m.deleted_at IS NULL
        WHERE s.tenant_id = $1 AND s.deleted_at IS NULL
          AND m.sender_role = 'doctor'
    "#;

    let result: Option<AvgResponseTime> = sea_orm::FromQueryResult::find_by_statement(
        sea_orm::Statement::from_sql_and_values(
            sea_orm::DatabaseBackend::Postgres,
            sql,
            [tenant_id.into()],
        ),
    )
    .one(db)
    .await?;

    Ok(result.and_then(|r| r.avg_minutes))
}

// ---------------------------------------------------------------------------
// 健康数据统计
// ---------------------------------------------------------------------------

pub async fn get_dialysis_statistics(
    state: &HealthState,
    tenant_id: uuid::Uuid,
) -> AppResult<DialysisStatisticsResp> {
    let db = &state.db;

    let total_records = dialysis_record::Entity::find()
        .filter(dialysis_record::Column::TenantId.eq(tenant_id))
        .filter(dialysis_record::Column::DeletedAt.is_null())
        .count(db)
        .await?;

    let this_month = dialysis_record::Entity::find()
        .filter(dialysis_record::Column::TenantId.eq(tenant_id))
        .filter(dialysis_record::Column::DeletedAt.is_null())
        .filter(Expr::col(dialysis_record::Column::CreatedAt).gte(Expr::cust("date_trunc('month', NOW())")))
        .count(db)
        .await?;

    let pending_review = dialysis_record::Entity::find()
        .filter(dialysis_record::Column::TenantId.eq(tenant_id))
        .filter(dialysis_record::Column::DeletedAt.is_null())
        .filter(dialysis_record::Column::Status.eq("draft"))
        .count(db)
        .await?;

    let type_distribution = count_by_field(
        db, tenant_id,
        "SELECT dialysis_type AS name, COUNT(*) AS value FROM dialysis_record \
         WHERE tenant_id = $1 AND deleted_at IS NULL \
         AND created_at >= date_trunc('month', NOW()) \
         GROUP BY dialysis_type ORDER BY value DESC",
    ).await?;

    let complication_rate = compute_complication_rate(db, tenant_id).await?;
    let avg_ultrafiltration = compute_avg_field(db, tenant_id, "ultrafiltration_volume").await?;
    let avg_duration = compute_avg_field(db, tenant_id, "dialysis_duration").await?;

    Ok(DialysisStatisticsResp {
        total_records: total_records as i64,
        this_month: this_month as i64,
        type_distribution,
        complication_rate,
        avg_ultrafiltration,
        avg_duration,
        pending_review: pending_review as i64,
    })
}

pub async fn get_lab_report_statistics(
    state: &HealthState,
    tenant_id: uuid::Uuid,
) -> AppResult<LabReportStatisticsResp> {
    let db = &state.db;

    let total_reports = lab_report::Entity::find()
        .filter(lab_report::Column::TenantId.eq(tenant_id))
        .filter(lab_report::Column::DeletedAt.is_null())
        .count(db)
        .await?;

    let this_month = lab_report::Entity::find()
        .filter(lab_report::Column::TenantId.eq(tenant_id))
        .filter(lab_report::Column::DeletedAt.is_null())
        .filter(Expr::col(lab_report::Column::CreatedAt).gte(Expr::cust("date_trunc('month', NOW())")))
        .count(db)
        .await?;

    let pending_review = lab_report::Entity::find()
        .filter(lab_report::Column::TenantId.eq(tenant_id))
        .filter(lab_report::Column::DeletedAt.is_null())
        .filter(lab_report::Column::Status.eq("pending"))
        .count(db)
        .await?;

    let reviewed = lab_report::Entity::find()
        .filter(lab_report::Column::TenantId.eq(tenant_id))
        .filter(lab_report::Column::DeletedAt.is_null())
        .filter(lab_report::Column::Status.eq("reviewed"))
        .count(db)
        .await?;

    let type_distribution = count_by_field(
        db, tenant_id,
        "SELECT report_type AS name, COUNT(*) AS value FROM lab_report \
         WHERE tenant_id = $1 AND deleted_at IS NULL \
         AND created_at >= date_trunc('month', NOW()) \
         GROUP BY report_type ORDER BY value DESC",
    ).await?;

    let abnormal_items = count_abnormal_lab_items(db, tenant_id).await?;

    Ok(LabReportStatisticsResp {
        total_reports: total_reports as i64,
        this_month: this_month as i64,
        type_distribution,
        abnormal_items,
        pending_review: pending_review as i64,
        reviewed: reviewed as i64,
    })
}

pub async fn get_appointment_statistics(
    state: &HealthState,
    tenant_id: uuid::Uuid,
) -> AppResult<AppointmentStatisticsResp> {
    let db = &state.db;

    let total_appointments = appointment::Entity::find()
        .filter(appointment::Column::TenantId.eq(tenant_id))
        .filter(appointment::Column::DeletedAt.is_null())
        .count(db)
        .await?;

    let this_month = appointment::Entity::find()
        .filter(appointment::Column::TenantId.eq(tenant_id))
        .filter(appointment::Column::DeletedAt.is_null())
        .filter(Expr::col(appointment::Column::CreatedAt).gte(Expr::cust("date_trunc('month', NOW())")))
        .count(db)
        .await?;

    let status_distribution = count_by_field(
        db, tenant_id,
        "SELECT status AS name, COUNT(*) AS value FROM appointment \
         WHERE tenant_id = $1 AND deleted_at IS NULL \
         AND created_at >= date_trunc('month', NOW()) \
         GROUP BY status ORDER BY value DESC",
    ).await?;

    let type_distribution = count_by_field(
        db, tenant_id,
        "SELECT appointment_type AS name, COUNT(*) AS value FROM appointment \
         WHERE tenant_id = $1 AND deleted_at IS NULL \
         AND created_at >= date_trunc('month', NOW()) \
         GROUP BY appointment_type ORDER BY value DESC",
    ).await?;

    let cancelled = appointment::Entity::find()
        .filter(appointment::Column::TenantId.eq(tenant_id))
        .filter(appointment::Column::DeletedAt.is_null())
        .filter(Expr::col(appointment::Column::CreatedAt).gte(Expr::cust("date_trunc('month', NOW())")))
        .filter(appointment::Column::Status.eq("cancelled"))
        .count(db)
        .await?;

    let cancel_rate = if this_month > 0 {
        (cancelled as f64 / this_month as f64) * 100.0
    } else {
        0.0
    };

    Ok(AppointmentStatisticsResp {
        total_appointments: total_appointments as i64,
        this_month: this_month as i64,
        status_distribution,
        type_distribution,
        cancel_rate,
    })
}

pub async fn get_vital_signs_report_rate(
    state: &HealthState,
    tenant_id: uuid::Uuid,
) -> AppResult<VitalSignsReportRateResp> {
    let db = &state.db;

    let total_patients = patient::Entity::find()
        .filter(patient::Column::TenantId.eq(tenant_id))
        .filter(patient::Column::DeletedAt.is_null())
        .count(db)
        .await?;

    let total_records = vital_signs::Entity::find()
        .filter(vital_signs::Column::TenantId.eq(tenant_id))
        .filter(vital_signs::Column::DeletedAt.is_null())
        .filter(Expr::col(vital_signs::Column::CreatedAt).gte(Expr::cust("date_trunc('month', NOW())")))
        .count(db)
        .await?;

    let reported_patients = count_distinct_patients_vital_signs(db, tenant_id).await?;

    let report_rate = if total_patients > 0 {
        (reported_patients as f64 / total_patients as f64) * 100.0
    } else {
        0.0
    };

    let daily_trend = compute_daily_report_rate(db, tenant_id).await?;

    Ok(VitalSignsReportRateResp {
        total_patients: total_patients as i64,
        reported_patients: reported_patients as i64,
        report_rate,
        total_records: total_records as i64,
        daily_trend,
    })
}

pub async fn get_health_data_stats(
    state: &HealthState,
    tenant_id: uuid::Uuid,
) -> AppResult<HealthDataStatsResp> {
    let dialysis = get_dialysis_statistics(state, tenant_id).await?;
    let lab_reports = get_lab_report_statistics(state, tenant_id).await?;
    let appointments = get_appointment_statistics(state, tenant_id).await?;
    let vital_signs_report_rate = get_vital_signs_report_rate(state, tenant_id).await?;

    Ok(HealthDataStatsResp {
        dialysis,
        lab_reports,
        appointments,
        vital_signs_report_rate,
    })
}

// ---------------------------------------------------------------------------
// 辅助查询
// ---------------------------------------------------------------------------

#[derive(Debug, FromQueryResult)]
struct NameValueRow {
    name: String,
    value: i64,
}

async fn count_by_field(
    db: &sea_orm::DatabaseConnection,
    tenant_id: uuid::Uuid,
    sql: &str,
) -> AppResult<Vec<NameValue>> {
    let rows: Vec<NameValueRow> = sea_orm::FromQueryResult::find_by_statement(
        sea_orm::Statement::from_sql_and_values(
            sea_orm::DatabaseBackend::Postgres,
            sql,
            [tenant_id.into()],
        ),
    )
    .all(db)
    .await?;

    Ok(rows.into_iter().map(|r| NameValue { name: r.name, value: r.value }).collect())
}

#[derive(Debug, FromQueryResult)]
struct AvgFieldResult {
    avg_val: Option<f64>,
}

macro_rules! avg_field_sql {
    ($field:literal) => {
        concat!(
            "SELECT AVG(", $field, ")::FLOAT8 AS avg_val FROM dialysis_record ",
            "WHERE tenant_id = $1 AND deleted_at IS NULL AND ", $field, " IS NOT NULL ",
            "AND created_at >= date_trunc('month', NOW())"
        )
    };
}

async fn compute_avg_field(
    db: &sea_orm::DatabaseConnection,
    tenant_id: uuid::Uuid,
    field: &str,
) -> AppResult<Option<f64>> {
    let sql = match field {
        "ultrafiltration_volume" => avg_field_sql!("ultrafiltration_volume"),
        "dialysis_duration" => avg_field_sql!("dialysis_duration"),
        "uf_volume" => avg_field_sql!("uf_volume"),
        "uf_rate" => avg_field_sql!("uf_rate"),
        "blood_flow_rate" => avg_field_sql!("blood_flow_rate"),
        "dialysate_flow_rate" => avg_field_sql!("dialysate_flow_rate"),
        "pre_weight" => avg_field_sql!("pre_weight"),
        "post_weight" => avg_field_sql!("post_weight"),
        "pre_bp_systolic" => avg_field_sql!("pre_bp_systolic"),
        "pre_bp_diastolic" => avg_field_sql!("pre_bp_diastolic"),
        "post_bp_systolic" => avg_field_sql!("post_bp_systolic"),
        "post_bp_diastolic" => avg_field_sql!("post_bp_diastolic"),
        _ => return Err(erp_core::error::AppError::Validation(format!("不允许的字段名: {field}"))),
    };
    let result: Option<AvgFieldResult> = sea_orm::FromQueryResult::find_by_statement(
        sea_orm::Statement::from_sql_and_values(
            sea_orm::DatabaseBackend::Postgres,
            sql,
            [tenant_id.into()],
        ),
    )
    .one(db)
    .await?;

    Ok(result.and_then(|r| r.avg_val))
}

async fn compute_complication_rate(
    db: &sea_orm::DatabaseConnection,
    tenant_id: uuid::Uuid,
) -> AppResult<f64> {
    let sql = r#"
        SELECT
            COUNT(*) FILTER (WHERE complication_notes IS NOT NULL AND complication_notes != '') AS with_comp,
            COUNT(*) AS total
        FROM dialysis_record
        WHERE tenant_id = $1 AND deleted_at IS NULL
          AND created_at >= date_trunc('month', NOW())
    "#;

    #[derive(Debug, FromQueryResult)]
    struct CompResult {
        with_comp: i64,
        total: i64,
    }

    let result: Option<CompResult> = sea_orm::FromQueryResult::find_by_statement(
        sea_orm::Statement::from_sql_and_values(
            sea_orm::DatabaseBackend::Postgres,
            sql,
            [tenant_id.into()],
        ),
    )
    .one(db)
    .await?;

    Ok(match result {
        Some(r) if r.total > 0 => (r.with_comp as f64 / r.total as f64) * 100.0,
        _ => 0.0,
    })
}

async fn count_abnormal_lab_items(
    db: &sea_orm::DatabaseConnection,
    tenant_id: uuid::Uuid,
) -> AppResult<i64> {
    let sql = r#"
        SELECT COALESCE(SUM(jsonb_array_length(
            COALESCE(
                (SELECT jsonb_agg(elem) FROM jsonb_array_elements(items) elem WHERE elem->>'is_abnormal' = 'true'),
                '[]'::jsonb
            )
        )), 0) AS total
        FROM lab_report
        WHERE tenant_id = $1 AND deleted_at IS NULL AND items IS NOT NULL
          AND created_at >= date_trunc('month', NOW())
    "#;

    #[derive(Debug, FromQueryResult)]
    struct AbnormalCount {
        total: Option<i64>,
    }

    let result: Option<AbnormalCount> = sea_orm::FromQueryResult::find_by_statement(
        sea_orm::Statement::from_sql_and_values(
            sea_orm::DatabaseBackend::Postgres,
            sql,
            [tenant_id.into()],
        ),
    )
    .one(db)
    .await?;

    Ok(result.and_then(|r| r.total).unwrap_or(0))
}

async fn count_distinct_patients_vital_signs(
    db: &sea_orm::DatabaseConnection,
    tenant_id: uuid::Uuid,
) -> AppResult<u64> {
    let sql = r#"
        SELECT COUNT(DISTINCT patient_id) AS cnt
        FROM vital_signs
        WHERE tenant_id = $1 AND deleted_at IS NULL
          AND created_at >= date_trunc('month', NOW())
    "#;

    #[derive(Debug, FromQueryResult)]
    struct DistinctCount {
        cnt: i64,
    }

    let result: Option<DistinctCount> = sea_orm::FromQueryResult::find_by_statement(
        sea_orm::Statement::from_sql_and_values(
            sea_orm::DatabaseBackend::Postgres,
            sql,
            [tenant_id.into()],
        ),
    )
    .one(db)
    .await?;

    Ok(result.map(|r| r.cnt as u64).unwrap_or(0))
}

async fn compute_daily_report_rate(
    db: &sea_orm::DatabaseConnection,
    tenant_id: uuid::Uuid,
) -> AppResult<Vec<DailyReportRate>> {
    let sql = r#"
        SELECT d::date::text AS date,
               COUNT(DISTINCT vs.patient_id) AS reported,
               0 AS total
        FROM generate_series(
            CURRENT_DATE - INTERVAL '6 days',
            CURRENT_DATE,
            INTERVAL '1 day'
        ) d
        LEFT JOIN vital_signs vs ON vs.record_date = d::date
            AND vs.tenant_id = $1 AND vs.deleted_at IS NULL
        GROUP BY d::date
        ORDER BY d::date
    "#;

    #[derive(Debug, FromQueryResult)]
    struct DailyRow {
        date: String,
        reported: i64,
        total: i64,
    }

    let rows: Vec<DailyRow> = sea_orm::FromQueryResult::find_by_statement(
        sea_orm::Statement::from_sql_and_values(
            sea_orm::DatabaseBackend::Postgres,
            sql,
            [tenant_id.into()],
        ),
    )
    .all(db)
    .await?;

    let total_patients = patient::Entity::find()
        .filter(patient::Column::TenantId.eq(tenant_id))
        .filter(patient::Column::DeletedAt.is_null())
        .count(db)
        .await?;

    Ok(rows.into_iter().map(|r| {
        let total = total_patients as i64;
        let rate = if total > 0 { (r.reported as f64 / total as f64) * 100.0 } else { 0.0 };
        DailyReportRate { date: r.date, reported: r.reported, total, rate }
    }).collect())
}

// ---------------------------------------------------------------------------
// 个人维度统计
// ---------------------------------------------------------------------------

pub async fn get_personal_stats(
    state: &HealthState,
    user_id: uuid::Uuid,
    tenant_id: uuid::Uuid,
) -> AppResult<PersonalStatsResp> {
    let db = &state.db;

    // 通过 user_id 查找 doctor_profile 以获得 doctor_id
    let doctor_profile = doctor_profile::Entity::find()
        .filter(doctor_profile::Column::TenantId.eq(tenant_id))
        .filter(doctor_profile::Column::DeletedAt.is_null())
        .filter(doctor_profile::Column::UserId.eq(user_id))
        .one(db)
        .await?;

    let doctor_id = doctor_profile.map(|p| p.id);

    // my_patients: 通过 patient_doctor_relation 统计
    let my_patients = if let Some(did) = doctor_id {
        patient_doctor_relation::Entity::find()
            .filter(patient_doctor_relation::Column::TenantId.eq(tenant_id))
            .filter(patient_doctor_relation::Column::DeletedAt.is_null())
            .filter(patient_doctor_relation::Column::DoctorId.eq(did))
            .count(db)
            .await? as i64
    } else {
        0
    };

    // new_patients_this_month: 本月新增关联患者
    let new_patients_this_month = if let Some(did) = doctor_id {
        let sql = r#"
            SELECT COUNT(*) AS cnt
            FROM patient_doctor_relation pdr
            INNER JOIN patient p ON p.id = pdr.patient_id AND p.deleted_at IS NULL AND p.tenant_id = $1
            WHERE pdr.tenant_id = $1 AND pdr.deleted_at IS NULL
              AND pdr.doctor_id = $2
              AND p.created_at >= date_trunc('month', NOW())
        "#;

        #[derive(Debug, FromQueryResult)]
        struct Cnt {
            cnt: i64,
        }

        let result: Option<Cnt> = FromQueryResult::find_by_statement(
            sea_orm::Statement::from_sql_and_values(
                sea_orm::DatabaseBackend::Postgres,
                sql,
                [tenant_id.into(), did.into()],
            ),
        )
        .one(db)
        .await?;

        result.map(|r| r.cnt).unwrap_or(0)
    } else {
        0
    };

    // follow_up_rate: 分配给当前用户的随访完成率
    let sql = r#"
        SELECT COALESCE(status, '__total') AS status, COUNT(*) AS cnt
        FROM follow_up_task
        WHERE tenant_id = $1 AND deleted_at IS NULL AND assigned_to = $2
        GROUP BY GROUPING SETS ((status), ())
    "#;

    #[derive(Debug, FromQueryResult)]
    struct StatusCount {
        status: String,
        cnt: i64,
    }

    let fu_rows: Vec<StatusCount> = FromQueryResult::find_by_statement(
        sea_orm::Statement::from_sql_and_values(
            sea_orm::DatabaseBackend::Postgres,
            sql,
            [tenant_id.into(), user_id.into()],
        ),
    )
    .all(db)
    .await?;

    let mut fu_total: i64 = 0;
    let mut fu_completed: i64 = 0;
    let mut overdue_follow_ups: i64 = 0;
    for row in &fu_rows {
        match row.status.as_str() {
            "__total" => fu_total = row.cnt,
            "completed" => fu_completed = row.cnt,
            "overdue" => overdue_follow_ups = row.cnt,
            _ => {}
        }
    }
    let follow_up_rate = if fu_total > 0 {
        (fu_completed as f64 / fu_total as f64) * 100.0
    } else {
        0.0
    };

    // consultations_this_month / pending_consultations: 咨询统计
    let consultations_this_month = if let Some(did) = doctor_id {
        consultation_session::Entity::find()
            .filter(consultation_session::Column::TenantId.eq(tenant_id))
            .filter(consultation_session::Column::DeletedAt.is_null())
            .filter(consultation_session::Column::DoctorId.eq(did))
            .filter(Expr::col(consultation_session::Column::CreatedAt).gte(Expr::cust("date_trunc('month', NOW())")))
            .count(db)
            .await? as i64
    } else {
        0
    };

    let pending_consultations = if let Some(did) = doctor_id {
        consultation_session::Entity::find()
            .filter(consultation_session::Column::TenantId.eq(tenant_id))
            .filter(consultation_session::Column::DeletedAt.is_null())
            .filter(consultation_session::Column::DoctorId.eq(did))
            .filter(consultation_session::Column::Status.eq("active"))
            .count(db)
            .await? as i64
    } else {
        0
    };

    // today_appointments: 今日预约
    let today_appointments = if let Some(did) = doctor_id {
        appointment::Entity::find()
            .filter(appointment::Column::TenantId.eq(tenant_id))
            .filter(appointment::Column::DeletedAt.is_null())
            .filter(appointment::Column::DoctorId.eq(did))
            .filter(Expr::col(appointment::Column::AppointmentDate).eq(Expr::cust("CURRENT_DATE")))
            .count(db)
            .await? as i64
    } else {
        0
    };

    // today_follow_ups: 今日随访任务
    let today_follow_ups = follow_up_task::Entity::find()
        .filter(follow_up_task::Column::TenantId.eq(tenant_id))
        .filter(follow_up_task::Column::DeletedAt.is_null())
        .filter(follow_up_task::Column::AssignedTo.eq(user_id))
        .filter(Expr::col(follow_up_task::Column::PlannedDate).eq(Expr::cust("CURRENT_DATE")))
        .count(db)
        .await? as i64;

    // vital_signs_report_rate: 当前医生的患者体征上报率
    let (vital_signs_reported, vital_signs_total, vital_signs_report_rate) = if my_patients > 0 {
        let vs_sql = r#"
            SELECT
                COUNT(DISTINCT vs.patient_id) AS reported,
                $3::bigint AS total
            FROM vital_signs vs
            WHERE vs.tenant_id = $1 AND vs.deleted_at IS NULL
              AND vs.created_at >= date_trunc('month', NOW())
              AND vs.patient_id IN (
                  SELECT patient_id FROM patient_doctor_relation
                  WHERE doctor_id = $2 AND tenant_id = $1 AND deleted_at IS NULL
              )
        "#;

        #[derive(Debug, FromQueryResult)]
        struct VsCount {
            reported: i64,
            total: i64,
        }

        let result: Option<VsCount> = FromQueryResult::find_by_statement(
            sea_orm::Statement::from_sql_and_values(
                sea_orm::DatabaseBackend::Postgres,
                vs_sql,
                [tenant_id.into(), doctor_id.unwrap_or_default().into(), my_patients.into()],
            ),
        )
        .one(db)
        .await?;

        match result {
            Some(r) => {
                let rate = if r.total > 0 {
                    (r.reported as f64 / r.total as f64) * 100.0
                } else {
                    0.0
                };
                (r.reported, r.total, rate)
            }
            None => (0, my_patients, 0.0),
        }
    } else {
        (0, 0, 0.0)
    };

    // pending_lab_reviews: 待审核化验报告（与当前医生的患者关联）
    let pending_lab_reviews = if doctor_id.is_some() {
        let lr_sql = r#"
            SELECT COUNT(*) AS cnt
            FROM lab_report lr
            WHERE lr.tenant_id = $1 AND lr.deleted_at IS NULL
              AND lr.status = 'pending'
              AND lr.patient_id IN (
                  SELECT patient_id FROM patient_doctor_relation
                  WHERE doctor_id = $2 AND tenant_id = $1 AND deleted_at IS NULL
              )
        "#;

        #[derive(Debug, FromQueryResult)]
        struct LrCnt {
            cnt: i64,
        }

        let result: Option<LrCnt> = FromQueryResult::find_by_statement(
            sea_orm::Statement::from_sql_and_values(
                sea_orm::DatabaseBackend::Postgres,
                lr_sql,
                [tenant_id.into(), doctor_id.unwrap_or_default().into()],
            ),
        )
        .one(db)
        .await?;

        result.map(|r| r.cnt).unwrap_or(0)
    } else {
        0
    };

    // abnormal_vital_signs: 简化实现，返回 0（完整实现需要关联危急值阈值配置）
    let abnormal_vital_signs: i64 = 0;

    Ok(PersonalStatsResp {
        my_patients,
        new_patients_this_month,
        follow_up_rate,
        consultations_this_month,
        pending_consultations,
        vital_signs_report_rate,
        today_appointments,
        overdue_follow_ups,
        today_follow_ups,
        abnormal_vital_signs,
        vital_signs_reported,
        vital_signs_total,
        pending_lab_reviews,
    })
}