use crate::ws_all::{
    convert_course_sections_to_req_course_sections_for_jihua_daka_scenario,
    convert_course_sections_to_req_course_sections_for_jihua_daka_scenario2, find_hty_user_by_host,
    find_hty_user_group_by_id,
};
use crate::ws_lianxi::count_lianxi_and_piyue_on_the_fly;
use anyhow::anyhow;
use axum::extract::{Path, Query, State};
use axum::Json;
use chrono::NaiveDateTime;
use diesel::PgConnection;
use htycommons::common::{
    current_local_datetime, get_page_and_page_size, parse_date_time, strip_result_vec, HtyErr,
    HtyErrCode, HtyResponse,
};
use htycommons::db::{exec_read_write_task, extract_conn, fetch_db_conn, DbState};
use htycommons::jwt::jwt_decode_token;
use htycommons::uuid;
use htycommons::web::{
    wrap_json_anyhow_err, wrap_json_ok_resp, AuthorizationHeader, HtyHostHeader,
    HtySudoerTokenHeader,
};
use htyuc_remote::remote_calls::find_hty_user_with_info_by_id;
use htyws_models::models::{
    Daka, DakaCourseSection, JihuaCourseSectionMeta, Course, ReqDakaCourseSection,
    ReqDakaCourseSectionsRelation, ReqDakaWithCourseSectionIds, ReqDakaWithCourseSections,
    ReqDakaWithCourseSections2,
};
use std::collections::HashMap;
use std::ops::DerefMut;
use std::sync::Arc;
use tracing::{debug, error};

fn required_current_org_id_from_sudoer_token_str(token_str: &String) -> anyhow::Result<String> {
    jwt_decode_token(token_str)?
        .current_org_id
        .ok_or_else(|| anyhow!("current_org_id is required"))
}

pub async fn create_daka(
    root: HtySudoerTokenHeader,
    host: HtyHostHeader,
    auth: AuthorizationHeader,
    State(db_pool): State<Arc<DbState>>,
    Json(in_daka): Json<ReqDakaWithCourseSectionIds>,
) -> Json<HtyResponse<String>> {
    debug!("create_daka -> starts");
    match raw_create_daka(auth, root, host, db_pool, &in_daka).await {
        Ok(ok) => wrap_json_ok_resp(ok),
        Err(e) => {
            error!("create_daka -> failed to create daka, e: {}", e);
            wrap_json_anyhow_err(e)
        }
    }
}

pub async fn raw_create_daka(
    _token: AuthorizationHeader,
    root: HtySudoerTokenHeader,
    host: HtyHostHeader,
    db_pool: Arc<DbState>,
    in_req_daka: &ReqDakaWithCourseSectionIds,
) -> anyhow::Result<String> {
    let current_org_id = jwt_decode_token(&(*_token).clone())?
        .current_org_id
        .ok_or_else(|| anyhow!("current_org_id is required"))?;
    let req_daka = in_req_daka.clone();
    if req_daka.start_date.is_none()
        || req_daka.duration_days.is_none()
        || req_daka.name.is_none()
        || req_daka.teacher_id.is_none()
    // || req_daka.group_id.is_none()
    {
        return Err(anyhow!(HtyErr {
            code: HtyErrCode::WebErr,
            reason: Some(
                "start_date or duration_days or name or teacher_id or teacher_name is none".into()
            ),
        }));
    }
    let teacher_name = find_hty_user_by_host(
        &req_daka
            .teacher_id
            .clone()
            .ok_or_else(|| anyhow!("teacher_id is required"))?,
        &host,
        &root,
    )
    .await?
    .real_name;

    let now = current_local_datetime();
    let insert_daka = Daka {
        id: uuid(),
        desc: req_daka.desc.clone(),
        start_date: req_daka
            .start_date
            .clone()
            .ok_or_else(|| anyhow!("start_date is required"))?,
        duration_days: req_daka
            .duration_days
            .clone()
            .ok_or_else(|| anyhow!("duration_days is required"))?,
        name: req_daka
            .name
            .clone()
            .ok_or_else(|| anyhow!("name is required"))?,
        created_at: now.clone(),
        created_by: req_daka
            .created_by
            .clone()
            .ok_or_else(|| anyhow!("created_by is required"))?,
        teacher_id: req_daka
            .teacher_id
            .clone()
            .ok_or_else(|| anyhow!("teacher_id is required"))?,
        group_id: req_daka.group_id.clone(),
        is_delete: false,
        teacher_name,
        group_name: req_daka.group_name.clone(),
        lianxi_count: req_daka.lianxi_count.clone(),
        teachers: req_daka.teachers.clone(),
        updated_at: Some(now.clone()),
        updated_by: Some(
            req_daka
                .created_by
                .clone()
                .ok_or_else(|| anyhow!("created_by is required"))?,
        ),
        students: req_daka.students.clone(),
        course_sections: req_daka.course_sections.clone(),
        is_yanqi: req_daka.is_yanqi.clone(),
        org_id: Some(current_org_id),
    };

    let mut params = HashMap::new();
    params.insert("params".to_string(), (req_daka, insert_daka.clone()));
    let created_daka_result =
        raw_create_daka_tx(params, extract_conn(fetch_db_conn(&db_pool)?).deref_mut());
    match created_daka_result {
        Ok(create_daka) => Ok(create_daka.id),
        Err(e) => Err(anyhow!(HtyErr {
            code: HtyErrCode::WebErr,
            reason: Some("fail to create daka e: ".to_string() + &e.to_string()),
        })),
    }
}

pub fn raw_create_daka_tx(
    params: HashMap<String, (ReqDakaWithCourseSectionIds, Daka)>,
    conn: &mut PgConnection,
) -> anyhow::Result<Daka> {
    let task = move |in_params: Option<HashMap<String, (ReqDakaWithCourseSectionIds, Daka)>>,
                     conn: &mut PgConnection|
          -> anyhow::Result<Daka> {
        let the_params = in_params.ok_or_else(|| anyhow!("params is required"))?;
        let (req_daka_with_section_ids, insert_daka) = the_params
            .clone()
            .get("params")
            .ok_or_else(|| anyhow!("params key not found"))?
            .clone();
        let sections_ids = req_daka_with_section_ids
            .to_owned()
            .course_section_ids
            .unwrap_or_default();

        debug!("START CREATE DAKA -> {:?}", &the_params);

        let result_daka = Daka::create(&insert_daka, conn)?;

        debug!("DAKA CREATED -> {:?}", &result_daka);

        let meta_data = JihuaCourseSectionMeta { meta: None };

        for in_section_id in sections_ids {
            let section = DakaCourseSection {
                id: uuid(),
                daka_id: result_daka.id.clone(),
                course_section_id: in_section_id,
                meta: Some(meta_data.clone()),
                is_delete: false,
                org_id: result_daka.org_id.clone(),
            };
            debug!("START CREATE DAKA QUMU SECTION -> {:?}", &section);
            let created_section = DakaCourseSection::create(&section, conn)?;
            debug!("CREATED DAKA QUMU SECTION -> {:?}", &created_section);
        }
        Ok(result_daka)
    };
    exec_read_write_task(Box::new(task), Some(params), conn)
}

pub async fn find_daka_by_id(
    root: HtySudoerTokenHeader,
    Path(id): Path<String>,
    State(db_pool): State<Arc<DbState>>,
) -> Json<HtyResponse<ReqDakaWithCourseSections>> {
    debug!("find_daka_by_id -> start here");
    match raw_find_daka_by_id(&root, &id, db_pool).await {
        Ok(res) => {
            debug!("find_daka_by_id -> successfully find daka: {:?}", res);
            wrap_json_ok_resp(res)
        }
        Err(e) => {
            error!("find_daka_by_id -> failed to find daka, e: {}", e);
            wrap_json_anyhow_err(e)
        }
    }
}

pub async fn find_daka_by_id2(
    root: HtySudoerTokenHeader,
    Path(id): Path<String>,
    State(db_pool): State<Arc<DbState>>,
) -> Json<HtyResponse<ReqDakaWithCourseSections2>> {
    debug!("find_daka_by_id2 -> start here");
    match raw_find_daka_by_id2(&root, &id, db_pool).await {
        Ok(res) => {
            debug!("find_daka_by_id2 -> successfully find daka: {:?}", res);
            wrap_json_ok_resp(res)
        }
        Err(e) => {
            error!("find_daka_by_id2 -> failed to find daka, e: {}", e);
            wrap_json_anyhow_err(e)
        }
    }
}

pub async fn raw_find_daka_by_id2(
    root: &HtySudoerTokenHeader,
    id: &String,
    db_pool: Arc<DbState>,
) -> anyhow::Result<ReqDakaWithCourseSections2> {
    debug!("raw_find_daka_by_id2 -> {:?}", id);
    let current_org_id = required_current_org_id_from_sudoer_token_str(&root.0)?;
    let daka = Daka::find_by_id_in_org(
        &id,
        &current_org_id,
        extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
    )?;

    debug!("raw_find_daka_by_id2 -> daka: {:?}", id);

    let all_lianxis =
        daka.find_active_belonging_lianxis(extract_conn(fetch_db_conn(&db_pool)?).deref_mut())?;

    debug!("raw_find_daka_by_id2 -> all_lianxis: {:?}", all_lianxis);

    let (count_lianxi, not_piyue_count) = count_lianxi_and_piyue_on_the_fly(&all_lianxis);

    let the_course_sections =
        daka.find_active_linked_course_sections(extract_conn(fetch_db_conn(&db_pool)?).deref_mut())?;

    debug!(
        "raw_find_daka_by_id2 -> the_course_sections: {:?}",
        the_course_sections
    );

    let any_req_course_sections = convert_course_sections_to_req_course_sections_for_jihua_daka_scenario2(
        &String::from("DAKA"),
        &daka.id,
        the_course_sections.clone(),
        extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
    );

    debug!(
        "raw_find_daka_by_id2 -> any_req_course_sections: {:?}",
        any_req_course_sections
    );

    let out_req_course_sections = strip_result_vec(any_req_course_sections)?;

    debug!(
        "raw_find_daka_by_id2 -> out_req_course_sections: {:?}",
        out_req_course_sections
    );

    let any_relations: Vec<anyhow::Result<ReqDakaCourseSection>> = the_course_sections
        .iter()
        .map(|course_section| {
            let daka_org_id = daka
                .org_id
                .as_ref()
                .ok_or_else(|| anyhow!("daka.org_id is required"))?;
            let in_jihua_course_section =
                DakaCourseSection::find_by_daka_id_and_course_section_id_in_org(
                    &daka.id,
                    &course_section.id,
                    daka_org_id,
                    extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
                )?;
            Ok(ReqDakaCourseSection {
                id: Some(in_jihua_course_section.id.clone()),
                daka_id: None,
                course_section_id: Some(in_jihua_course_section.course_section_id.clone()),
                meta: None,
                is_delete: Some(in_jihua_course_section.is_delete.clone()),
            })
        })
        .collect();

    debug!(
        "raw_find_daka_by_id2 -> daka.teacher_id {:?}",
        &daka.teacher_id
    );

    let user_teacher = find_hty_user_with_info_by_id(&daka.teacher_id, root).await?;

    let user_group;
    if let Some(group_id) = &daka.group_id {
        let c_group_id = group_id.clone();
        user_group = find_hty_user_group_by_id(&c_group_id.clone(), root).await?;

        Ok(ReqDakaWithCourseSections2 {
            all_lianxis: None,
            created_at: Some(daka.created_at.clone()),
            created_by: Some(daka.created_by.clone()),
            desc: daka.desc.clone(),
            duration_days: Some(daka.duration_days.clone()),
            group_id: Some(c_group_id.clone()),
            group_name: user_group.group_name,
            id: Some(daka.id.clone()),
            is_delete: Some(daka.is_delete.clone()),
            is_yanqi: daka.is_yanqi.clone(),
            lianxi_count: Some(count_lianxi),
            name: Some(daka.name.clone()),
            not_piyue_count: Some(not_piyue_count),
            course_sections2: daka.course_sections.clone(),
            course_sections: Some(out_req_course_sections),
            relations: Some(strip_result_vec(any_relations)?),
            start_date: Some(daka.start_date.clone()),
            students: daka.students.clone(),
            teacher_id: Some(daka.teacher_id.clone()),
            teacher_name: user_teacher.real_name,
            teachers: daka.teachers.clone(),
            updated_at: daka.updated_at.clone(),
            updated_by: daka.updated_by.clone(),
        })
    } else {
        Ok(ReqDakaWithCourseSections2 {
            id: Some(daka.id.clone()),
            desc: daka.desc.clone(),
            start_date: Some(daka.start_date.clone()),
            duration_days: Some(daka.duration_days.clone()),
            name: Some(daka.name.clone()),
            created_at: Some(daka.created_at.clone()),
            created_by: Some(daka.created_by.clone()),
            teacher_id: Some(daka.teacher_id.clone()),
            group_id: None,
            is_delete: Some(daka.is_delete.clone()),
            teacher_name: user_teacher.real_name,
            group_name: None,
            course_sections: Some(out_req_course_sections),
            lianxi_count: Some(count_lianxi),
            teachers: daka.teachers.clone(),
            updated_at: daka.updated_at.clone(),
            all_lianxis: None,
            relations: Some(strip_result_vec(any_relations)?),
            not_piyue_count: Some(not_piyue_count),
            updated_by: daka.updated_by.clone(),
            students: daka.students.clone(),
            course_sections2: daka.course_sections.clone(),
            is_yanqi: daka.is_yanqi.clone(),
        })
    }
}

pub async fn raw_find_daka_by_id(
    root: &HtySudoerTokenHeader,
    id: &String,
    db_pool: Arc<DbState>,
) -> anyhow::Result<ReqDakaWithCourseSections> {
    let current_org_id = required_current_org_id_from_sudoer_token_str(&root.0)?;
    let daka = Daka::find_by_id_in_org(
        &id,
        &current_org_id,
        extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
    )?;

    let all_lianxis =
        daka.find_active_belonging_lianxis(extract_conn(fetch_db_conn(&db_pool)?).deref_mut())?;
    let (count_lianxi, not_piyue_count) = count_lianxi_and_piyue_on_the_fly(&all_lianxis);
    let the_course_sections =
        daka.find_active_linked_course_sections(extract_conn(fetch_db_conn(&db_pool)?).deref_mut())?;

    let any_req_course_sections = convert_course_sections_to_req_course_sections_for_jihua_daka_scenario(
        &String::from("DAKA"),
        &daka.id,
        the_course_sections.clone(),
        extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
    );

    let out_req_course_sections = strip_result_vec(any_req_course_sections)?;

    let any_relations: Vec<anyhow::Result<ReqDakaCourseSection>> = the_course_sections
        .iter()
        .map(|course_section| {
            let daka_org_id = daka
                .org_id
                .as_ref()
                .ok_or_else(|| anyhow!("daka.org_id is required"))?;
            let in_jihua_course_section =
                DakaCourseSection::find_by_daka_id_and_course_section_id_in_org(
                    &daka.id,
                    &course_section.id,
                    daka_org_id,
                    extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
                )?;
            Ok(ReqDakaCourseSection {
                id: Some(in_jihua_course_section.id.clone()),
                daka_id: None,
                course_section_id: Some(in_jihua_course_section.course_section_id.clone()),
                meta: None,
                is_delete: Some(in_jihua_course_section.is_delete.clone()),
            })
        })
        .collect();

    debug!(
        "raw_find_daka_by_id -> daka.teacher_id {:?}",
        &daka.teacher_id
    );

    let user_teacher = find_hty_user_with_info_by_id(&daka.teacher_id, root).await?;

    if let Some(group_id) = &daka.group_id {
        let c_group_id = group_id.clone();
        let user_group = find_hty_user_group_by_id(&c_group_id, root).await?;

        Ok(ReqDakaWithCourseSections {
            id: Some(daka.id.clone()),
            desc: daka.desc.clone(),
            start_date: Some(daka.start_date.clone()),
            duration_days: Some(daka.duration_days.clone()),
            name: Some(daka.name.clone()),
            created_at: Some(daka.created_at.clone()),
            created_by: Some(daka.created_by.clone()),
            teacher_id: Some(daka.teacher_id.clone()),
            group_id: Some(c_group_id),
            is_delete: Some(daka.is_delete.clone()),
            teacher_name: user_teacher.real_name,
            group_name: user_group.group_name,
            course_sections: Some(out_req_course_sections),
            lianxi_count: Some(count_lianxi),
            all_lianxis: None,
            relations: Some(strip_result_vec(any_relations)?),
            not_piyue_count: Some(not_piyue_count),
            teachers: daka.teachers.clone(),
            updated_at: daka.updated_at.clone(),
            updated_by: daka.updated_by.clone(),
            students: daka.students.clone(),
            course_sections2: daka.course_sections.clone(),
            is_yanqi: daka.is_yanqi.clone(),
        })
    } else {
        Ok(ReqDakaWithCourseSections {
            id: Some(daka.id.clone()),
            desc: daka.desc.clone(),
            start_date: Some(daka.start_date.clone()),
            duration_days: Some(daka.duration_days.clone()),
            name: Some(daka.name.clone()),
            created_at: Some(daka.created_at.clone()),
            created_by: Some(daka.created_by.clone()),
            teacher_id: Some(daka.teacher_id.clone()),
            group_id: None,
            is_delete: Some(daka.is_delete.clone()),
            teacher_name: user_teacher.real_name,
            group_name: None,
            course_sections: Some(out_req_course_sections),
            lianxi_count: Some(count_lianxi),
            all_lianxis: None,
            relations: Some(strip_result_vec(any_relations)?),
            not_piyue_count: Some(not_piyue_count),
            teachers: daka.teachers.clone(),
            updated_at: daka.updated_at.clone(),
            updated_by: daka.updated_by.clone(),
            students: daka.students.clone(),
            course_sections2: daka.course_sections.clone(),
            is_yanqi: daka.is_yanqi.clone(),
        })
    }
}

pub async fn update_daka(
    _root: HtySudoerTokenHeader,
    auth: AuthorizationHeader,
    State(db_pool): State<Arc<DbState>>,
    Json(in_daka): Json<ReqDakaWithCourseSectionIds>,
) -> Json<HtyResponse<String>> {
    debug!("update_daka_by_id -> starts");
    debug!("update_daka_by_id -> in_daka / {:?}", &in_daka);

    match raw_update_daka(auth, db_pool, &in_daka).await {
        Ok(ok) => wrap_json_ok_resp(ok),
        Err(e) => {
            error!("update_jihua -> failed to update jihua, e: {}", e);
            wrap_json_anyhow_err(e)
        }
    }
}

pub async fn raw_update_daka(
    _token: AuthorizationHeader,
    db_pool: Arc<DbState>,
    in_req_daka: &ReqDakaWithCourseSectionIds,
) -> anyhow::Result<String> {
    let current_org_id = jwt_decode_token(&(*_token).clone())?
        .current_org_id
        .ok_or_else(|| anyhow!("current_org_id is required"))?;
    let the_req_daka = in_req_daka.clone();
    let id_daka = the_req_daka
        .clone()
        .id
        .ok_or_else(|| anyhow!("id is required"))?;

    if the_req_daka.id.is_none()
        || the_req_daka.start_date.is_none()
        || the_req_daka.duration_days.is_none()
        || the_req_daka.name.is_none()
    // || the_req_daka.group_id.is_none()
    // || the_req_daka.teacher_id.is_none()
    {
        return Err(anyhow!(HtyErr {
            code: HtyErrCode::NullErr,
            reason: Some(
                "missing mandatory fields for Daka: id / start_date / duration_days / name".into()
            ),
        }));
    }

    let mut params = HashMap::new();
    params.insert("c_req_daka".to_string(), the_req_daka.clone());
    debug!("raw_update_daka -> update_daka -> {:?}", &params);

    let task_update_daka = move |in_params: Option<HashMap<String, ReqDakaWithCourseSectionIds>>,
                                 conn: &mut PgConnection|
          -> anyhow::Result<()> {
        let the_params = in_params.ok_or_else(|| anyhow!("params is required"))?;
        debug!("task_update_daka params -> {:?}", &the_params);
        let c_req_daka = the_params
            .clone()
            .get("c_req_daka")
            .ok_or_else(|| anyhow!("c_req_daka key not found"))?
            .clone();
        let mut db_daka = Daka::find_by_id(&id_daka, conn)?;

        db_daka.desc = c_req_daka.desc.clone();
        db_daka.start_date = c_req_daka
            .start_date
            .clone()
            .ok_or_else(|| anyhow!("start_date is required"))?;
        db_daka.duration_days = c_req_daka
            .duration_days
            .clone()
            .ok_or_else(|| anyhow!("duration_days is required"))?;
        db_daka.name = c_req_daka
            .name
            .clone()
            .ok_or_else(|| anyhow!("name is required"))?;
        db_daka.teacher_id = c_req_daka
            .teacher_id
            .clone()
            .ok_or_else(|| anyhow!("teacher_id is required"))?;
        db_daka.group_id = c_req_daka.group_id.clone();
        db_daka.teacher_name = c_req_daka.teacher_name.clone();
        db_daka.group_name = c_req_daka.group_name.clone();
        db_daka.teachers = c_req_daka.teachers.clone();
        db_daka.students = c_req_daka.students.clone();
        db_daka.updated_by = c_req_daka.updated_by.clone();
        db_daka.updated_at = c_req_daka.updated_at.clone();
        db_daka.course_sections = c_req_daka.course_sections.clone();
        db_daka.is_yanqi = c_req_daka.is_yanqi.clone();
        db_daka.org_id = Some(current_org_id.clone());

        debug!("raw_update_daka -> update_daka -> {:?}", &db_daka);

        Daka::update(&db_daka, conn)?;

        let _ = raw_update_daka_course_section_relations(
            &c_req_daka.to_req_daka_course_sections_relation()?,
            conn,
        );
        Ok(())
    };

    let _ = match exec_read_write_task(
        Box::new(task_update_daka),
        Some(params),
        extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
    ) {
        Ok(()) => Ok(()),
        _ => Err(anyhow!(HtyErr {
            code: HtyErrCode::NullErr,
            reason: Some("raw_update_daka -> updated error ".into()),
        })),
    };
    Ok(the_req_daka
        .clone()
        .id
        .ok_or_else(|| anyhow!("id is required"))?)
}

pub fn raw_update_daka_course_section_relations(
    in_daka_course_sections: &ReqDakaCourseSectionsRelation,
    conn: &mut PgConnection,
) -> anyhow::Result<()> {
    debug!("in_daka_course_sections -> {:?}", in_daka_course_sections);
    // 先验证数据完整性
    let c_in_daka_course_sections = in_daka_course_sections.clone();
    let in_daka_id = c_in_daka_course_sections.daka_id.clone();

    if let Some(daka_id) = &in_daka_id {
        let in_daka = Daka::find_by_id(daka_id, conn)?;
        // 确认打卡存在.
        debug!(
            "raw_update_daka_course_section_relations -> in_daka: {:?}",
            &in_daka
        );
        if c_in_daka_course_sections.course_section_ids.is_none() {
            // *没传入关系，则不动。*
            debug!("raw_update_daka_course_section_relations -> no incoming `daka_course_sections` to modify");
            Ok(())
        } else {
            let in_course_section_ids = c_in_daka_course_sections
                .clone()
                .course_section_ids
                .clone()
                .ok_or_else(|| anyhow!("course_section_ids is required"))?; // 这些是传入给我们要保留/添加的关系.

            // *更新逻辑*
            // 1.把不存在于传入的`in_course_section_ids`，且已有的关系数据删掉（逻辑删除）。
            // 2. `in_course_section_ids`之前没有的数据添加进表。

            // 首先做第一步
            // todo: 改为逻辑删除后，这里会重复查出来`已删除`关系，后续优化。
            let current_org_id = in_daka
                .org_id
                .clone()
                .ok_or_else(|| anyhow!("daka.org_id is required"))?;
            let mut to_delete_relation_ids: Vec<String> = Vec::new();
            // 查找这个daka的所有course_section_ids，然后跟传入的做比对，把不存在于传入数据的ids放入`to_delete_relation_ids`,然后逻辑删除.
            let existing_daka_course_sections =
                DakaCourseSection::find_by_daka_id_in_org(daka_id, &current_org_id, conn)?;
            debug!(
                "raw_update_daka_course_section_relations -> existing_daka_course_sections -> {:?}",
                &existing_daka_course_sections
            );

            if !existing_daka_course_sections.is_empty() {
                for rel in existing_daka_course_sections {
                    let id_section = rel.course_section_id;
                    if !in_course_section_ids.contains(&id_section) {
                        to_delete_relation_ids.push(rel.id.clone()); // 如果这条已有关系在传入数据里不存在，则准备逻辑删除这条关系.
                    }
                }
            }

            debug!(
                "raw_update_jihua_course_section_relations -> to_delete_relation_ids -> {:?}",
                &to_delete_relation_ids
            );

            // todo: 改为逻辑删除后，这里会重复查出来`已删除`关系，后续优化。
            // 删除不再需要的关系
            for to_delete_rel_id in to_delete_relation_ids {
                // 这里只是逻辑删除.
                let _ = DakaCourseSection::logic_delete_by_id(&to_delete_rel_id, conn)?;
            }

            // 然后做第二步
            for in_course_section_id in in_course_section_ids.clone() {
                match DakaCourseSection::find_by_daka_id_and_course_section_id_in_org(
                    &in_daka.id,
                    &in_course_section_id,
                    &current_org_id,
                    conn,
                ) {
                    Ok(rel) => {
                        debug!("find_by_daka_id_and_course_section_id -> FOUND RELATION -> {:?} / UPDATING STATUS", & rel);
                        let mut c_rel = rel.clone();
                        c_rel.is_delete = false;
                        debug!(
                            "find_by_daka_id_and_course_section_id -> STATUS TO UPDATE {:?}",
                            &c_rel
                        );
                        let updated = DakaCourseSection::update(&c_rel, conn)?;
                        debug!(
                            "find_by_daka_id_and_course_section_id -> UPDATED ITEM {:?}",
                            &updated
                        );
                    }
                    Err(_err) => {
                        debug!(
                            "find_by_daka_id_and_course_section_id -> NOT FOUND RELATION / ADDING"
                        );
                        // 没有这条关系，添加.
                        let to_add_rel = DakaCourseSection {
                            id: uuid(),
                            daka_id: daka_id.clone(),
                            course_section_id: in_course_section_id.clone(),
                            meta: None,
                            is_delete: false,
                            org_id: in_daka.org_id.clone(),
                        };
                        debug!("raw_update_daka_course_section_relations -> ADDING THIS RELATION -> {:?}", & to_add_rel);
                        let _ = DakaCourseSection::create(&to_add_rel, conn)?;
                    }
                }
            }
            Ok(())
        }
    } else {
        return Err(anyhow!(HtyErr {
            code: HtyErrCode::NullErr,
            reason: Some("Null Daka ID".into()),
        }));
    }
}

pub async fn delete_daka_by_id(
    root: HtySudoerTokenHeader,
    Path(id_delete): Path<String>,
    State(db_pool): State<Arc<DbState>>,
) -> Json<HtyResponse<()>> {
    debug!("delete_daka_by_id -> start here");
    match raw_delete_daka_by_id(&root, &id_delete, db_pool).await {
        Ok(ok) => wrap_json_ok_resp(ok),
        Err(e) => {
            error!("delete_daka_by_id -> failed to delete daka, e: {}", e);
            wrap_json_anyhow_err(e)
        }
    }
}

pub async fn raw_delete_daka_by_id(
    root: &HtySudoerTokenHeader,
    id_delete: &String,
    db_pool: Arc<DbState>,
) -> anyhow::Result<()> {
    let current_org_id = required_current_org_id_from_sudoer_token_str(&root.0)?;
    let _ = Daka::find_by_id_in_org(
        id_delete,
        &current_org_id,
        extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
    )?;
    // 逻辑删除 daka
    let _ = Daka::logic_delete_by_id(
        id_delete,
        extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
    )?;
    Ok(())
}

pub async fn find_dakas_with_sections_by_user_id(
    Query(params): Query<HashMap<String, String>>,
    sudoer: HtySudoerTokenHeader,
    host: HtyHostHeader,
    _auth: AuthorizationHeader,
    State(db_pool): State<Arc<DbState>>,
) -> Json<HtyResponse<(Vec<ReqDakaWithCourseSections>, i64, i64)>> {
    debug!(
        "find_dakas_with_sections_by_user_id -> starts / params: {:?}",
        params
    );

    let teacher_id = params.get("teacher_id");
    let student_id = params.get("student_id");
    let scope = params.get("scope");
    if params.get("page").is_none() || params.get("page_size").is_none() {
        return wrap_json_anyhow_err(anyhow!("page or page_size not set!"));
    }
    let (some_page, some_page_size) = get_page_and_page_size(&params);
    let page = match some_page {
        Some(p) => p,
        None => return wrap_json_anyhow_err(anyhow!("page is required")),
    };
    let page_size = match some_page_size {
        Some(ps) => ps,
        None => return wrap_json_anyhow_err(anyhow!("page_size is required")),
    };

    if page < 1 || page_size < 1 {
        return wrap_json_anyhow_err(anyhow!("page or page_size not valid!"));
    }

    let start_date = params.get("start_date");
    let mut start_from: Option<NaiveDateTime> = None;
    if let Some(start_date_str) = start_date {
        match parse_date_time(start_date_str) {
            Ok(dt) => start_from = Some(dt),
            Err(e) => return wrap_json_anyhow_err(e),
        }
    }

    match raw_find_dakas_with_sections_by_user_id(
        &teacher_id,
        &student_id,
        &scope,
        &start_from,
        page,
        page_size,
        sudoer,
        &host,
        db_pool,
    )
    .await
    {
        Ok(ok) => wrap_json_ok_resp(ok),
        Err(e) => {
            error!(
                "find_dakas_with_sections_by_user_id -> failed to find, e: {}",
                e
            );
            wrap_json_anyhow_err(e)
        }
    }
}

pub async fn raw_find_dakas_with_sections_by_user_id(
    teacher_id: &Option<&String>,
    student_id: &Option<&String>,
    scope: &Option<&String>,
    start_from: &Option<NaiveDateTime>,
    page: i64,
    page_size: i64,
    _root: HtySudoerTokenHeader,
    _host: &HtyHostHeader,
    db_pool: Arc<DbState>,
) -> anyhow::Result<(Vec<ReqDakaWithCourseSections>, i64, i64)> {
    debug!("raw_find_dakas_with_sections_by_user_id -> START");
    debug!("raw_find_dakas_with_sections_by_user_id -> teacher_id: {:?} / student_id: {:?} / scope: {:?}", teacher_id, student_id, scope);
    let current_org_id = required_current_org_id_from_sudoer_token_str(&_root.0)?;

    if (teacher_id.is_some() && student_id.is_some())
        || (teacher_id.is_none() && student_id.is_none())
    {
        return Err(anyhow!(HtyErr {
            code: HtyErrCode::WebErr,
            reason: Some("teacher id and student id can only exits one".into()),
        }));
    }

    let dakas_with_pages: (Vec<Daka>, i64, i64);
    let dakas: Vec<Daka>;

    if teacher_id.is_some() {
        match scope {
            &Some(string_ref) => match string_ref.as_str() {
                "ALL" => {
                    dakas_with_pages = Daka::find_active_dakas_by_all_teachers_with_pagination(
                        teacher_id
                            .as_ref()
                            .ok_or_else(|| anyhow!("teacher_id is required"))?,
                        &current_org_id,
                        page,
                        page_size,
                        extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
                    )?;
                }
                "CREATED" => {
                    dakas_with_pages = Daka::find_active_dakas_by_owner_teacher_with_pagination(
                        teacher_id
                            .as_ref()
                            .ok_or_else(|| anyhow!("teacher_id is required"))?,
                        &current_org_id,
                        page,
                        page_size,
                        start_from,
                        extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
                    )?;
                }
                "ASSIGNED" => {
                    dakas_with_pages =
                        Daka::find_active_dakas_by_assigned_teachers_with_pagination(
                            teacher_id
                                .as_ref()
                                .ok_or_else(|| anyhow!("teacher_id is required"))?,
                            &current_org_id,
                            page,
                            page_size,
                            extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
                        )?;
                }
                _ => {
                    return Err(anyhow!(HtyErr {
                        code: HtyErrCode::WebErr,
                        reason: Some("invalid scope".into()),
                    }));
                }
            },
            &None => {
                return Err(anyhow!(HtyErr {
                    code: HtyErrCode::WebErr,
                    reason: Some("scope can not be none when teacher_id exist".into()),
                }));
            }
        }

        dakas = dakas_with_pages.0;
    } else {
        // student_id
        let id_student = student_id
            .as_ref()
            .ok_or_else(|| anyhow!("student_id is required"))?;

        dakas_with_pages = Daka::find_active_dakas_by_student_id_with_pagination(
            &id_student,
            &current_org_id,
            page,
            page_size,
            extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
        )?;
        dakas = dakas_with_pages.0;
    }

    let res: anyhow::Result<Vec<ReqDakaWithCourseSections>> = dakas
        .iter()
        .map(|daka| {
            let mut req_daka = daka.to_req();

            //---------------------------------------------------------------------------------------------------------
            let linked_course_section = daka.find_active_linked_course_sections(
                extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
            )?;
            let req_course_sections: anyhow::Result<Vec<_>> = linked_course_section
                .iter()
                .map(|course_section| {
                    let mut req_course_section = course_section.to_req_with_ref_resource(
                        extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
                    )?;
                    let linked_course = Course::find_by_id(
                        course_section
                            .course_id
                            .as_ref()
                            .ok_or_else(|| anyhow!("course_id is required"))?,
                        extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
                    )?;
                    req_course_section.course_name = Some(linked_course.name);
                    req_course_section.meta = None;
                    Ok(req_course_section)
                })
                .collect();
            let req_course_sections = req_course_sections?;

            req_daka.course_sections = Some(req_course_sections);
            //---------------------------------------------------------------------------------------------------------

            // todo: 更新数据后，切换为使用字段数据
            // // req_jihua.lianxi_count = Some(count_lianxi as i32);
            // let c_ret_count = jihua.lianxi_count.clone();
            // debug!("return lianxi_count: {:?}", c_ret_count);
            // if c_ret_count.is_none() {
            //     req_jihua.lianxi_count = Some(0);
            // } else {
            //     req_jihua.lianxi_count = c_ret_count;
            // }

            // fixme: 目前先动态计算
            // fix: 改为使用数据库字段
            // todo: 创建时练习时更新两个字段
            // todo: jihua里面补充`not_piyue_count`字段
            let all_lianxis = daka.find_active_belonging_lianxis(
                extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
            )?;
            let (count_lianxi, not_piyue_count) = count_lianxi_and_piyue_on_the_fly(&all_lianxis);
            req_daka.lianxi_count = Some(count_lianxi);
            req_daka.not_piyue_count = Some(not_piyue_count);

            Ok(req_daka)
        })
        .collect();

    match res {
        Ok(res) => Ok((res, dakas_with_pages.1, dakas_with_pages.2)),
        Err(e) => {
            debug!("err -> {:?}", e);
            return Err(anyhow!(e));
        }
    }
}