//! 设备管理 API — CRUD + 详情 + 级联下拉
//!
//! 提供柜子的增删改查、详情查询、安全码重新生成，
//! 以及柜子/仓板/仓体的级联下拉选项。

use axum::extract::{Path, Query, State};
use axum::Json;
use redis;
use serde::{Deserialize, Serialize};
use serde_json::{json, Value};
use sqlx::MySqlPool;

use super::organizations::{
    generate_auth_str,
    CabinBoardRow, CompartmentRow, CreateCabinetBody, ReplaceImeiBody, UpdateCabinetBody,
};
use crate::error::AppError;
use crate::middleware::auth::{self, CurrentUser};
use super::scope_guard;

/// 基础柜子行（只包含数据库字段，用于简单查询）
#[derive(Debug, Clone, Serialize, sqlx::FromRow)]
struct CabinetBasicRow {
    id: i64,
    project_id: Option<i64>,
    abstract_id: Option<String>,
    imei: String,
    iccid: Option<String>,
    name: Option<String>,
    address: Option<String>,
    latitude: Option<String>,
    longitude: Option<String>,
    status: i8,
    /// 充电工作模式：0=平台指令模式 1=自动充电工作模式
    work_mode: Option<i8>,
}

impl From<CabinetBasicRow> for super::organizations::CabinetRow {
    fn from(row: CabinetBasicRow) -> Self {
        super::organizations::CabinetRow {
            id: row.id,
            project_id: row.project_id,
            abstract_id: row.abstract_id,
            imei: row.imei,
            iccid: row.iccid,
            name: row.name,
            address: row.address,
            status: row.status,
            board_count: None,
            channel_count: None,
            idle_count: None,
            charging_count: None,
            full_count: None,
            fault_count: None,
            rssi: None,
            pow_fail_dc: None,
            pow_fail_ac: None,
            is_online: None,
            org_disabled: None,
            project_address: None,
        }
    }
}

// ---------------------------------------------------------------------------
// 项目访问权限验证
// ---------------------------------------------------------------------------

/// 验证用户是否有权访问指定项目
///
/// 总管理员（role_level >= 2）可访问所有项目；
/// 企业管理员只能访问本组织下的项目。
async fn check_project_access(
    user: &CurrentUser,
    pool: &MySqlPool,
    project_id: i64,
) -> Result<(), AppError> {
    // 总管理员可访问所有项目
    if user.role_level >= 2 {
        return Ok(());
    }

    if let Some(org_id) = user.organization_id {
        // 验证项目是否属于用户的组织
        let project: Option<(i64,)> = sqlx::query_as(
            "SELECT id FROM projects WHERE id = ? AND organization_id = ?",
        )
        .bind(project_id)
        .bind(org_id)
        .fetch_optional(pool)
        .await?;

        if project.is_none() {
            return Err(AppError::Forbidden("无权访问该项目".into()));
        }
    } else {
        return Err(AppError::Forbidden("无组织关联".into()));
    }

    Ok(())
}

// ---------------------------------------------------------------------------
// 设备 CRUD
// ---------------------------------------------------------------------------

/// GET /api/projects/:project_id/cabinets — 按项目查询柜子列表
pub async fn list_cabinets(
    user: CurrentUser,
    State(state): State<super::AppState>,
    Path(project_id): Path<i64>,
) -> Result<Json<Value>, AppError> {
    auth::check_permission(&user, "device:view")?;
    check_project_access(&user, &state.mysql, project_id).await?;

    let db = &state.mysql;
    let sql_rows = sqlx::query_as::<_, CabinetBasicRow>(
        r#"SELECT id, project_id, abstract_id, imei, iccid, name, address, status, work_mode
           FROM cabinets WHERE project_id = ? ORDER BY id"#,
    )
    .bind(project_id)
    .fetch_all(db)
    .await?;

    let rows: Vec<super::organizations::CabinetRow> = sql_rows.into_iter().map(Into::into).collect();
    Ok(Json(json!({ "code": 0, "data": rows, "message": "ok" })))
}

/// POST /api/cabinets — 批量添加柜子
///
/// 每个 IMEI 创建一个柜子，同时生成默认仓控板和 6 个仓体。
pub async fn create_cabinet(
    user: CurrentUser,
    State(state): State<super::AppState>,
    Json(body): Json<CreateCabinetBody>,
) -> Result<Json<Value>, AppError> {
    auth::check_permission(&user, "device:create")?;
    scope_guard::verify_project_ownership(&state.mysql, &user, body.project_id).await?;

    let db = &state.mysql;
    if body.imeis.is_empty() {
        return Err(AppError::BadRequest("IMEI 列表不能为空".into()));
    }

    let mut unique_imeis: Vec<String> = Vec::new();
    for imei in &body.imeis {
        let trimmed = imei.trim().to_string();
        if trimmed.len() != 15 {
            return Err(AppError::BadRequest(
                format!("IMEI 必须为15位数字: {}", trimmed),
            ));
        }
        if !unique_imeis.contains(&trimmed) {
            unique_imeis.push(trimmed);
        }
    }

    let mut created_ids: Vec<i64> = Vec::new();

    for imei in &unique_imeis {
        let auth_str = generate_auth_str();

        let mut tx = db.begin().await.map_err(AppError::Database)?;

        let result = sqlx::query(
            r#"INSERT INTO cabinets (project_id, imei, auth_str)
               VALUES (?, ?, ?)"#,
        )
        .bind(body.project_id)
        .bind(imei)
        .bind(&auth_str)
        .execute(&mut *tx)
        .await?;

        let cabinet_id = result.last_insert_id() as i64;

        let board_result = sqlx::query(
            r#"INSERT INTO cabin_boards (cabinet_id, board_id) VALUES (?, 1)"#,
        )
        .bind(cabinet_id)
        .execute(&mut *tx)
        .await?;

        let board_pk = board_result.last_insert_id() as i64;

        for ch in 1..=6 {
            sqlx::query(
                r#"INSERT INTO compartments (cabin_board_id, channel_id) VALUES (?, ?)"#,
            )
            .bind(board_pk)
            .bind(ch)
            .execute(&mut *tx)
            .await?;
        }

        tx.commit().await.map_err(AppError::Database)?;
        created_ids.push(cabinet_id);
        tracing::info!("创建柜子 id={} imei={}", cabinet_id, imei);
    }

    Ok(Json(json!({ "code": 0, "data": { "ids": created_ids }, "message": "ok" })))
}

/// PUT /api/cabinets/:id — 更新柜子（划拨项目等）
pub async fn update_cabinet(
    user: CurrentUser,
    State(state): State<super::AppState>,
    Path(id): Path<i64>,
    Json(body): Json<UpdateCabinetBody>,
) -> Result<Json<Value>, AppError> {
    auth::check_permission(&user, "device:edit")?;
    scope_guard::verify_cabinet_ownership(&state.mysql, &user, id).await?;

    let db = &state.mysql;
    let rows = sqlx::query(
        r#"UPDATE cabinets SET
            project_id = COALESCE(?, project_id),
            name = COALESCE(?, name),
            abstract_id = COALESCE(?, abstract_id)
         WHERE id = ?"#,
    )
    .bind(body.project_id)
    .bind(&body.name)
    .bind(&body.abstract_id)
    .bind(id)
    .execute(db)
    .await?
    .rows_affected();

    if rows == 0 {
        return Err(AppError::NotFound(format!("柜子 {} 不存在", id)));
    }

    tracing::info!("更新柜子 id={}", id);
    Ok(Json(json!({ "code": 0, "data": null, "message": "ok" })))
}

/// 柜子状态更新请求体
#[derive(Debug, Deserialize)]
pub struct SetCabinetStatusBody {
    pub status: i8,
}

/// PUT /api/cabinets/:id/status — 设置柜子状态（启用/禁用）
///
/// 注意：禁/启用操作仅总管理员（role_level >= 2）可以执行，客户管理员无此权限。
pub async fn set_cabinet_status(
    user: CurrentUser,
    State(state): State<super::AppState>,
    Path(id): Path<i64>,
    Json(body): Json<SetCabinetStatusBody>,
) -> Result<Json<Value>, AppError> {
    auth::check_permission(&user, "device:edit")?;
    scope_guard::verify_cabinet_ownership(&state.mysql, &user, id).await?;

    // 禁/启用操作仅总管理员可执行
    if user.role_level < 2 {
        return Err(AppError::Forbidden("仅总管理员可禁用/启用柜子".into()));
    }

    let db = &state.mysql;
    let rows = sqlx::query("UPDATE cabinets SET status = ? WHERE id = ?")
        .bind(body.status)
        .bind(id)
        .execute(db)
        .await?
        .rows_affected();

    if rows == 0 {
        return Err(AppError::NotFound(format!("柜子 {} 不存在", id)));
    }

    let action = if body.status == 2 { "禁用" } else { "启用" };
    tracing::info!("{}柜子 id={}", action, id);
    Ok(Json(json!({ "code": 0, "data": null, "message": "ok" })))
}

/// 充电工作模式更新请求体（前端契约：字符串 "0" / "1"）
#[derive(Debug, Deserialize)]
pub struct UpdateWorkModeBody {
    pub work_mode: String,
}

/// PUT /api/cabinets/:id/work-mode — 设置充电工作模式
///
/// 0=平台指令模式（默认，需平台下发指令才充电）
/// 1=自动充电工作模式（设备自主充电）
/// 权限：device:edit（编辑设备），并校验柜子存在 + 组织归属。
pub async fn update_work_mode(
    user: CurrentUser,
    State(state): State<super::AppState>,
    Path(id): Path<i64>,
    Json(body): Json<UpdateWorkModeBody>,
) -> Result<Json<Value>, AppError> {
    auth::check_permission(&user, "device:edit")?;
    // 组织隔离：非总管理员只能改本组织项目的柜子
    scope_guard::verify_cabinet_ownership(&state.mysql, &user, id).await?;

    // 白名单取值，拒绝一切其它输入（含 "2"、"true" 等）
    let mode: i8 = match body.work_mode.trim() {
        "0" => 0,
        "1" => 1,
        other => {
            return Err(AppError::BadRequest(format!(
                "work_mode 只能为 \"0\"(平台指令模式) 或 \"1\"(自动充电模式)，收到: {}",
                other
            )))
        }
    };

    let rows = sqlx::query("UPDATE cabinets SET work_mode = ? WHERE id = ?")
        .bind(mode)
        .bind(id)
        .execute(&state.mysql)
        .await?
        .rows_affected();

    // 总管理员路径下 verify_cabinet_ownership 直接放行，这里兜底不存在的情况
    if rows == 0 {
        return Err(AppError::NotFound(format!("柜子 {} 不存在", id)));
    }

    tracing::info!("设置充电工作模式 id={} work_mode={}", id, mode);
    Ok(Json(json!({ "code": 0, "data": { "success": true }, "message": "ok" })))
}

/// DELETE /api/cabinets/:id — 删除柜子（级联删除仓控板和仓体）
pub async fn delete_cabinet(
    user: CurrentUser,
    State(state): State<super::AppState>,
    Path(id): Path<i64>,
) -> Result<Json<Value>, AppError> {
    auth::check_permission(&user, "device:delete")?;
    scope_guard::verify_cabinet_ownership(&state.mysql, &user, id).await?;

    let db = &state.mysql;
    let mut tx = db.begin().await.map_err(AppError::Database)?;

    sqlx::query(
        r#"DELETE compartments FROM compartments
           INNER JOIN cabin_boards ON compartments.cabin_board_id = cabin_boards.id
           WHERE cabin_boards.cabinet_id = ?"#,
    )
    .bind(id)
    .execute(&mut *tx)
    .await?;

    sqlx::query(r#"DELETE FROM cabin_boards WHERE cabinet_id = ?"#)
        .bind(id)
        .execute(&mut *tx)
        .await?;

    let rows = sqlx::query(r#"DELETE FROM cabinets WHERE id = ?"#)
        .bind(id)
        .execute(&mut *tx)
        .await?
        .rows_affected();

    tx.commit().await.map_err(AppError::Database)?;

    if rows == 0 {
        return Err(AppError::NotFound(format!("柜子 {} 不存在", id)));
    }

    tracing::info!("删除柜子 id={}", id);
    Ok(Json(json!({ "code": 0, "data": null, "message": "ok" })))
}

/// POST /api/cabinets/:id/bind — 绑定平台抽象ID
pub async fn bind_cabinet(
    user: CurrentUser,
    State(state): State<super::AppState>,
    Path(id): Path<i64>,
) -> Result<Json<Value>, AppError> {
    auth::check_permission(&user, "device:edit")?;
    scope_guard::verify_cabinet_ownership(&state.mysql, &user, id).await?;

    let db = &state.mysql;

    // 检查柜子是否存在且未绑定
    let bound: (i64,) = sqlx::query_as(
        "SELECT COUNT(*) FROM cabinets WHERE id = ? AND abstract_id IS NULL"
    )
    .bind(id)
    .fetch_one(db)
    .await?;

    if bound.0 == 0 {
        return Err(AppError::BadRequest("柜子不存在或已绑定".into()));
    }

    // 事务：插入绑定记录 + 回写设备表
    let mut tx = db.begin().await.map_err(AppError::Database)?;

    let result = sqlx::query(
        "INSERT INTO abstract_bindings (cabinet_id) VALUES (?)"
    )
    .bind(id)
    .execute(&mut *tx)
    .await?;

    let binding_id = result.last_insert_id() as u64;
    let abstract_id = format!("10-{:08X}", binding_id);

    sqlx::query(
        "UPDATE cabinets SET abstract_id = ? WHERE id = ?"
    )
    .bind(&abstract_id)
    .bind(id)
    .execute(&mut *tx)
    .await?;

    tx.commit().await.map_err(AppError::Database)?;

    tracing::info!("绑定柜子 id={} abstract_id={}", id, abstract_id);
    Ok(Json(json!({ "code": 0, "data": { "abstract_id": abstract_id }, "message": "ok" })))
}

/// POST /api/cabinets/:id/replace-imei — 更换IMEI（换模组）
pub async fn replace_imei(
    user: CurrentUser,
    State(state): State<super::AppState>,
    Path(id): Path<i64>,
    Json(body): Json<ReplaceImeiBody>,
) -> Result<Json<Value>, AppError> {
    auth::check_permission(&user, "device:edit")?;
    scope_guard::verify_cabinet_ownership(&state.mysql, &user, id).await?;

    let imei = body.imei.trim().to_string();
    if imei.len() != 15 || !imei.chars().all(|c| c.is_ascii_digit()) {
        return Err(AppError::BadRequest("IMEI 必须为15位数字".into()));
    }

    let db = &state.mysql;

    // 检查柜子是否存在
    let exists: (i64,) = sqlx::query_as("SELECT COUNT(*) FROM cabinets WHERE id = ?")
        .bind(id)
        .fetch_one(db)
        .await?;
    if exists.0 == 0 {
        return Err(AppError::NotFound(format!("柜子 {} 不存在", id)));
    }

    // 检查新IMEI是否已被其他柜子使用
    let conflict: Vec<(i64, Option<String>)> = sqlx::query_as(
        "SELECT id, name FROM cabinets WHERE imei = ? AND id != ?"
    )
    .bind(&imei)
    .bind(id)
    .fetch_all(db)
    .await?;

    if let Some(row) = conflict.first() {
        let name = row.1.as_deref().unwrap_or("未知");
        return Err(AppError::Conflict(
            format!("IMEI {} 已被柜子 {} ({}) 使用", imei, row.0, name)
        ));
    }

    // 更新IMEI
    sqlx::query("UPDATE cabinets SET imei = ? WHERE id = ?")
        .bind(&imei)
        .bind(id)
        .execute(db)
        .await?;

    tracing::info!("更换IMEI id={} new_imei={}", id, imei);
    Ok(Json(json!({ "code": 0, "data": null, "message": "ok" })))
}

/// POST /api/cabinets/:id/regenerate-auth — 重新生成安全码
pub async fn regenerate_auth(
    user: CurrentUser,
    State(state): State<super::AppState>,
    Path(id): Path<i64>,
) -> Result<Json<Value>, AppError> {
    // 仅总管理员可重置安全码：device:auth_str:reset 不在企业管理员/操作员的权限码表中，
    // 且 check_permission 对 role_level >= 2 直接放行，因此等价于「仅总管理员可用」
    auth::check_permission(&user, "device:auth_str:reset")?;
    scope_guard::verify_cabinet_ownership(&state.mysql, &user, id).await?;

    let db = &state.mysql;
    let auth_str = generate_auth_str();

    let rows = sqlx::query(r#"UPDATE cabinets SET auth_str = ?, auth_str_issued = 0 WHERE id = ?"#)
        .bind(&auth_str)
        .bind(id)
        .execute(db)
        .await?
        .rows_affected();

    // 同步 Redis：
    //   1. 用新码覆盖 auth_str:{imei} —— 旧安全码【立即失效】，设备继续用旧码 login 会收到「签名错误」，
    //      从而触发设备重新调用 auth_str 申领新码，形成自愈闭环
    //   2. 清除 auth_str:issued:{imei} 标记 —— 允许设备重新申领
    let imei: Option<String> = sqlx::query_scalar("SELECT imei FROM cabinets WHERE id = ?")
        .bind(id)
        .fetch_optional(db)
        .await?;
    if let Some(imei) = imei {
        let code_key = format!("auth_str:{}", imei);
        let issued_key = format!("auth_str:issued:{}", imei);
        let mut conn = state.redis.clone();

        if let Err(e) = redis::cmd("SET")
            .arg(&code_key)
            .arg(&auth_str)
            .query_async::<()>(&mut conn)
            .await
        {
            tracing::error!("[regenerate_auth] SET {} 失败: {}", code_key, e);
        }

        let _: Result<(), _> = redis::cmd("DEL")
            .arg(&issued_key)
            .query_async(&mut conn)
            .await;
    }

    if rows == 0 {
        return Err(AppError::NotFound(format!("柜子 {} 不存在", id)));
    }

    tracing::info!("重新生成 auth_str id={}", id);
    Ok(Json(json!({ "code": 0, "data": { "auth_str": auth_str }, "message": "ok" })))
}

// ---------------------------------------------------------------------------
// 柜子详情（含仓控板 + 仓体）
// ---------------------------------------------------------------------------

/// GET /api/cabinets/:id — 柜子详情，包含仓控板和仓体
pub async fn get_cabinet_detail(
    user: CurrentUser,
    State(state): State<super::AppState>,
    Path(id): Path<i64>,
) -> Result<Json<Value>, AppError> {
    auth::check_permission(&user, "device:view")?;

    let db = &state.mysql;
    let cabinet = sqlx::query_as::<_, CabinetBasicRow>(
        r#"SELECT id, project_id, abstract_id, imei, iccid, name, address, CAST(latitude AS CHAR) AS latitude, CAST(longitude AS CHAR) AS longitude, status, work_mode
           FROM cabinets WHERE id = ?"#,
    )
    .bind(id)
    .fetch_optional(db)
    .await?
    .ok_or_else(|| AppError::NotFound(format!("柜子 {} 不存在", id)))?;

    // 验证用户是否有权访问该柜子所属的项目
    if let Some(pid) = cabinet.project_id {
        check_project_access(&user, db, pid).await?;
    }

    // 仓控板 + 仓体（含实时字段占位），并收集通道 Redis key 所需的映射
    let (mut cabin_boards, comp_ids, comp_to_board) = load_boards_with_compartments(db, id).await?;

    // 一次 pipeline 读取柜级 + 通道级实时状态；Redis 异常一律降级，不让详情接口整体失败
    let realtime =
        fetch_cabinet_realtime(&state.redis_url, &cabinet.imei, &comp_ids, &comp_to_board).await;
    apply_realtime(&mut cabin_boards, &realtime);

    // 查询项目名称
    let project_name: Option<String> = if let Some(pid) = cabinet.project_id {
        sqlx::query_scalar("SELECT name FROM projects WHERE id = ?")
            .bind(pid)
            .fetch_optional(db)
            .await
            .ok()
            .flatten()
    } else {
        None
    };

    Ok(Json(json!({
        "code": 0,
        "data": {
            "id": cabinet.id,
            "project_id": cabinet.project_id,
            "project_name": project_name,
            "abstract_id": cabinet.abstract_id,
            "imei": cabinet.imei,
            "iccid": cabinet.iccid,
            "name": cabinet.name,
            "status": cabinet.status,
            // 充电工作模式：字符串 "0"/"1"（前端契约），无值时为 null
            "work_mode": cabinet.work_mode.map(|m| m.to_string()),
            "rssi": realtime.rssi,
            "pow_fail_dc": realtime.pow_fail_dc,
            "pow_fail_ac": realtime.pow_fail_ac,
            // 柜温：Redis `device:{imei}.temp`，语义 K×100（与柜级 temp 口径一致）；
            // 取不到为 null（前端显示 `--°C`），不落 0
            "temp": realtime.temp,
            "address": cabinet.address,
            "latitude": cabinet.latitude,
            "longitude": cabinet.longitude,
            "cabin_boards": cabin_boards,
        },
        "message": "ok"
    })))
}

// ---------------------------------------------------------------------------
// 设备详情 — Redis 实时状态（柜级 + 通道级）
// ---------------------------------------------------------------------------

/// 详情页实时状态快照；Redis 不可用时整体为默认空值
///
/// 所有字段一律 `Option`：Redis 里取不到就保持 `None`（响应 JSON 为 `null`），
/// **绝不落成 0/空串** —— 0 是"真实读数为 0"，与"无数据"必须区分。
#[derive(Default)]
struct CabinetRealtime {
    rssi: Option<i32>,
    pow_fail_dc: Option<bool>,
    pow_fail_ac: Option<bool>,
    /// 柜温，平台单位 K×100（Redis `device:{imei}` 的 `temp`）
    temp: Option<i64>,
    /// 仓体 id -> (SOC, 电池ID)
    soc_map: std::collections::HashMap<i64, (Option<i64>, Option<String>)>,
    /// 仓体 id -> 通道级实时状态
    ch_map: std::collections::HashMap<i64, ChannelRealtime>,
}

/// 单通道实时状态（与 `report_worker::write_channel_state` 写入的 Hash 字段一一对应）
///
/// 单位口径与 `docs/API.md` 一致：`soc` ‰ / `voltage` mV / `current` mA / `temp` K×100，
/// `batt_status` / `pow_status` 为 2 位 hex 字符串。
#[derive(Default, Clone, Debug)]
struct ChannelRealtime {
    /// 电芯最高温度，单位 K×100
    temp: Option<i64>,
    /// 电池状态（2 位 hex）
    batt_status: Option<String>,
    /// 电源状态（2 位 hex）
    pow_status: Option<String>,
    /// 充电电压，单位 mV
    voltage: Option<i64>,
    /// 充电电流，单位 mA
    current: Option<i64>,
}

/// pipeline 中柜级（`device:{imei}`）HGET 的字段个数：rssi / pow_fail_dc / pow_fail_ac / temp。
/// 与 [`fetch_cabinet_realtime`] 下发的命令顺序、[`parse_cabinet_realtime`] 的下标解析
/// **三者必须同步修改**，故抽成常量。
const CABINET_REALTIME_FIELDS: usize = 4;
/// pipeline 中每个通道 HGET 的字段个数：temp / batt_status / pow_status / voltage / current
const CHANNEL_REALTIME_FIELDS: usize = 5;

/// 查询仓控板与仓体，构建带实时字段占位的 JSON
///
/// 返回 `(柜控板JSON列表, 仓体id列表, 仓体id->(板号,通道号)映射)`，
/// 后两者供 Redis 批量查询通道级状态使用（板号/通道号为十进制不补零）。
async fn load_boards_with_compartments(
    db: &MySqlPool,
    cabinet_id: i64,
) -> Result<(Vec<Value>, Vec<i64>, Vec<(i64, (i8, i8))>), AppError> {
    let boards: Vec<CabinBoardRow> = sqlx::query_as(
        r#"SELECT id, cabinet_id, board_id, status
           FROM cabin_boards WHERE cabinet_id = ? ORDER BY board_id"#,
    )
    .bind(cabinet_id)
    .fetch_all(db)
    .await?;

    let mut cabin_boards: Vec<Value> = Vec::new();
    let mut comp_ids: Vec<i64> = Vec::new();
    let mut comp_to_board: Vec<(i64, (i8, i8))> = Vec::new();

    for board in boards {
        let compartments: Vec<CompartmentRow> = sqlx::query_as(
            r#"SELECT id, cabin_board_id, channel_id, status
               FROM compartments WHERE cabin_board_id = ? ORDER BY channel_id"#,
        )
        .bind(board.id)
        .fetch_all(db)
        .await?;

        for c in &compartments {
            comp_ids.push(c.id);
            comp_to_board.push((c.id, (board.board_id, c.channel_id)));
        }

        // batt_status / pow_status 为 2 位 hex 字符串，Redis 缺失时保持 null
        let comp_values: Vec<Value> = compartments
            .into_iter()
            .map(|c| {
                json!({
                    "id": c.id,
                    "channel_id": c.channel_id,
                    "status": c.status,
                    "batt_status": Value::Null,
                    "pow_status": Value::Null,
                    // 通道级实时字段占位：Redis 缺失时保持 null（**不落 0**，
                    // 前端 `c.voltage ?? '-'` 据此显示"-"而不是"-mV"）
                    "voltage": Value::Null,
                    "current": Value::Null,
                    "temp": Value::Null,
                })
            })
            .collect();

        cabin_boards.push(json!({
            "id": board.id,
            "board_id": board.board_id,
            "status": board.status,
            "compartments": comp_values,
        }));
    }

    Ok((cabin_boards, comp_ids, comp_to_board))
}

/// 一次 pipeline 拉取柜级(device:{imei}) + 通道级(device:{imei}:board:{b}:ch:{c}) 实时状态
///
/// 为什么放一起：详情接口要求低延迟，柜级 4 个字段 + 每通道 5 个字段共用一次网络往返。
/// 任何一步失败都只记 WARN 并降级为空值 —— 详情主体数据来自 MySQL，不能因缓存故障整体失败。
///
/// 柜级第 4 个字段 `temp`（柜温，K×100）与通道级 `voltage`/`current` 是**补取**字段：
/// 设备上报（`report_worker::write_device_state` / `write_channel_state`）早就写进了 Redis，
/// 只是接口没取，导致 PC 端柜温恒为 `--°C`、电压电流恒为 `-mV -mA`。
async fn fetch_cabinet_realtime(
    redis_url: &str,
    imei: &str,
    comp_ids: &[i64],
    comp_to_board: &[(i64, (i8, i8))],
) -> CabinetRealtime {
    let client = match redis::Client::open(redis_url) {
        Ok(c) => c,
        Err(e) => {
            tracing::warn!("[cabinet_detail] Redis 客户端创建失败，实时状态降级: {}", e);
            return CabinetRealtime::default();
        }
    };
    // 使用多路复用连接（MultiplexedConnection），替代已废弃的 aio::Connection
    let mut conn = match client.get_multiplexed_async_connection().await {
        Ok(c) => c,
        Err(e) => {
            tracing::warn!("[cabinet_detail] Redis 连接失败，实时状态降级: {}", e);
            return CabinetRealtime::default();
        }
    };

    let key = format!("device:{}", imei);
    let mut pipe = redis::pipe();
    pipe.cmd("HGET").arg(&key).arg("rssi")
        .cmd("HGET").arg(&key).arg("pow_fail_dc")
        .cmd("HGET").arg(&key).arg("pow_fail_ac")
        .cmd("HGET").arg(&key).arg("temp");
    for cid in comp_ids {
        pipe.cmd("GET").arg(format!("compartment:status:{}", cid));
    }
    // 通道级：板号/通道号为十进制不补零，与设备上报写入的 key 保持一致
    for (_, (board_id, channel_id)) in comp_to_board {
        let rkey = format!("device:{}:board:{}:ch:{}", imei, board_id, channel_id);
        pipe.cmd("HGET").arg(&rkey).arg("temp")
            .cmd("HGET").arg(&rkey).arg("batt_status")
            .cmd("HGET").arg(&rkey).arg("pow_status")
            .cmd("HGET").arg(&rkey).arg("voltage")
            .cmd("HGET").arg(&rkey).arg("current");
    }

    // 用类型标注而非 turbofish：query_async 的泛型首参是连接类型
    let queried: Result<Vec<Option<String>>, redis::RedisError> =
        pipe.query_async(&mut conn).await;
    match queried {
        Ok(vals) => parse_cabinet_realtime(&vals, comp_ids, comp_to_board),
        Err(e) => {
            tracing::warn!("[cabinet_detail] Redis pipeline 读取失败，实时状态降级 imei={} err={}", imei, e);
            CabinetRealtime::default()
        }
    }
}

/// 解析 pipeline 结果：柜级 [`CABINET_REALTIME_FIELDS`] 项 + 每仓体 1 项(SOC JSON)
/// + 每通道 [`CHANNEL_REALTIME_FIELDS`] 项(temp/batt_status/pow_status/voltage/current)
///
/// 任何一项缺失或解析失败 → 对应字段保持 `None`（**不落 0**）。
fn parse_cabinet_realtime(
    vals: &[Option<String>],
    comp_ids: &[i64],
    comp_to_board: &[(i64, (i8, i8))],
) -> CabinetRealtime {
    /// 取出第 i 项的非空字符串
    fn pick(vals: &[Option<String>], i: usize) -> Option<String> {
        vals.get(i).and_then(|v| v.as_ref()).cloned()
    }
    /// 取出第 i 项并解析为 i64（空值/非数字 → None）
    fn pick_i64(vals: &[Option<String>], i: usize) -> Option<i64> {
        pick(vals, i).and_then(|v| v.trim().parse::<i64>().ok())
    }

    let mut rt = CabinetRealtime {
        rssi: pick(vals, 0).and_then(|v| v.parse().ok()),
        pow_fail_dc: pick(vals, 1).map(|v| v == "1"),
        pow_fail_ac: pick(vals, 2).map(|v| v == "1"),
        temp: pick_i64(vals, 3),
        ..Default::default()
    };

    for (i, cid) in comp_ids.iter().enumerate() {
        if let Some(data) = pick(vals, CABINET_REALTIME_FIELDS + i) {
            if let Ok(v) = serde_json::from_str::<Value>(&data) {
                let soc = v.get("soc").and_then(|s| s.as_i64());
                let bid = v.get("battery_id").and_then(|s| s.as_str()).map(str::to_string);
                rt.soc_map.insert(*cid, (soc, bid));
            }
        }
    }

    // 通道级字段紧随 SOC 段之后，每通道 CHANNEL_REALTIME_FIELDS 项
    let base = CABINET_REALTIME_FIELDS + comp_ids.len();
    for (i, (cid, _)) in comp_to_board.iter().enumerate() {
        let off = base + i * CHANNEL_REALTIME_FIELDS;
        rt.ch_map.insert(
            *cid,
            ChannelRealtime {
                temp: pick_i64(vals, off),
                batt_status: pick(vals, off + 1),
                pow_status: pick(vals, off + 2),
                voltage: pick_i64(vals, off + 3),
                current: pick_i64(vals, off + 4),
            },
        );
    }

    rt
}

/// 把实时状态注入仓体 JSON：缺失字段保持 null / 原值，绝不写空字符串，也绝不落 0
fn apply_realtime(cabin_boards: &mut [Value], rt: &CabinetRealtime) {
    for board in cabin_boards.iter_mut() {
        let Some(comps) = board.get_mut("compartments").and_then(|c| c.as_array_mut()) else {
            continue;
        };
        for comp in comps.iter_mut() {
            let Some(cid) = comp.get("id").and_then(|i| i.as_i64()) else {
                continue;
            };
            if let Some((soc, bid)) = rt.soc_map.get(&cid) {
                if let Some(s) = soc {
                    comp["soc"] = json!(s);
                }
                if let Some(b) = bid {
                    comp["battery_id"] = json!(b);
                }
            }
            if let Some(ch) = rt.ch_map.get(&cid) {
                if let Some(t) = ch.temp {
                    comp["temp"] = json!(t);
                }
                if let Some(bs) = &ch.batt_status {
                    comp["batt_status"] = json!(bs);
                }
                if let Some(ps) = &ch.pow_status {
                    comp["pow_status"] = json!(ps);
                }
                if let Some(v) = ch.voltage {
                    comp["voltage"] = json!(v);
                }
                if let Some(c) = ch.current {
                    comp["current"] = json!(c);
                }
            }
        }
    }
}

// ---------------------------------------------------------------------------
// 级联下拉选项
// ---------------------------------------------------------------------------

/// 柜子下拉查询参数
#[derive(Debug, Deserialize)]
pub struct CabinetListQuery {
    pub project_id: Option<i64>,
}

/// 仓板下拉查询参数
#[derive(Debug, Deserialize)]
pub struct CabinBoardListQuery {
    pub cabinet_id: i64,
}

/// 仓体下拉查询参数
#[derive(Debug, Deserialize)]
pub struct CompartmentListQuery {
    pub cabin_board_id: i64,
}

/// 柜子下拉选项
#[derive(Debug, Serialize, sqlx::FromRow)]
pub struct CabinetOption {
    pub id: i64,
    pub name: Option<String>,
    pub abstract_id: String,
    pub imei: Option<String>,
    pub iccid: Option<String>,
    pub address: Option<String>,
    pub status: i8,
}

/// 仓板下拉选项
#[derive(Debug, Serialize, sqlx::FromRow)]
pub struct CabinBoardOption {
    pub id: i64,
    pub board_id: i8,
}

/// 仓体下拉选项
#[derive(Debug, Serialize, sqlx::FromRow)]
pub struct CompartmentOption {
    pub id: i64,
    pub channel_id: i8,
}

/// GET /api/cabinets/options — 柜子下拉列表
pub async fn list_cabinet_options(
    user: CurrentUser,
    State(state): State<super::AppState>,
    Query(params): Query<CabinetListQuery>,
) -> Result<Json<Value>, AppError> {
    auth::check_permission(&user, "device:view")?;

    let rows = if let Some(pid) = params.project_id {
        sqlx::query_as::<_, CabinetOption>(
            "SELECT id, name, abstract_id, imei, iccid, address, status FROM cabinets WHERE project_id = ? ORDER BY id"
        )
        .bind(pid)
        .fetch_all(&state.mysql)
        .await?
    } else {
        sqlx::query_as::<_, CabinetOption>(
            "SELECT id, name, abstract_id, imei, iccid, address, status FROM cabinets ORDER BY id"
        )
        .fetch_all(&state.mysql)
        .await?
    };

    Ok(Json(json!({ "code": 0, "data": rows, "message": "ok" })))
}

/// GET /api/cabin-boards/options — 仓板下拉列表
pub async fn list_cabin_board_options(
    user: CurrentUser,
    State(state): State<super::AppState>,
    Query(params): Query<CabinBoardListQuery>,
) -> Result<Json<Value>, AppError> {
    auth::check_permission(&user, "device:view")?;

    let rows = sqlx::query_as::<_, CabinBoardOption>(
        "SELECT id, board_id FROM cabin_boards WHERE cabinet_id = ? ORDER BY board_id"
    )
    .bind(params.cabinet_id)
    .fetch_all(&state.mysql)
    .await?;

    Ok(Json(json!({ "code": 0, "data": rows, "message": "ok" })))
}

/// GET /api/compartments/options — 仓体下拉列表
pub async fn list_compartment_options(
    user: CurrentUser,
    State(state): State<super::AppState>,
    Query(params): Query<CompartmentListQuery>,
) -> Result<Json<Value>, AppError> {
    auth::check_permission(&user, "device:view")?;

    let rows = sqlx::query_as::<_, CompartmentOption>(
        "SELECT id, channel_id FROM compartments WHERE cabin_board_id = ? ORDER BY channel_id"
    )
    .bind(params.cabin_board_id)
    .fetch_all(&state.mysql)
    .await?;

    Ok(Json(json!({ "code": 0, "data": rows, "message": "ok" })))
}

// ---------------------------------------------------------------------------
// 单元测试
// ---------------------------------------------------------------------------

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

    /// pipeline 结果解析：柜级 4 项 + 每仓体 1 项(SOC) + 每通道 5 项的下标布局，
    /// 并确认电压/电流/柜温被正确取出（回归 ③：数据在 Redis 但接口不取）
    #[test]
    fn test_parse_cabinet_realtime_reads_voltage_current_and_temp() {
        let comp_ids = vec![11_i64, 12_i64];
        let comp_to_board = vec![(11_i64, (1_i8, 1_i8)), (12_i64, (1_i8, 2_i8))];
        let vals: Vec<Option<String>> = vec![
            // 柜级：rssi / pow_fail_dc / pow_fail_ac / temp
            Some("85".into()),
            Some("1".into()),
            Some("0".into()),
            Some("29815".into()),
            // 每仓体 1 项（compartment:status:{id}，该 key 无写入方 → 通常为 None）
            None,
            None,
            // 通道 11：temp / batt_status / pow_status / voltage / current
            Some("29815".into()),
            Some("82".into()),
            Some("03".into()),
            Some("53200".into()),
            Some("1500".into()),
            // 通道 12
            Some("30015".into()),
            Some("02".into()),
            Some("01".into()),
            Some("48000".into()),
            Some("0".into()),
        ];

        let rt = parse_cabinet_realtime(&vals, &comp_ids, &comp_to_board);

        assert_eq!(rt.rssi, Some(85));
        assert_eq!(rt.pow_fail_dc, Some(true));
        assert_eq!(rt.pow_fail_ac, Some(false));
        assert_eq!(rt.temp, Some(29815), "柜温应被取出");

        let ch11 = rt.ch_map.get(&11).expect("通道 11 应有实时状态");
        assert_eq!(ch11.voltage, Some(53200), "电压应被取出");
        assert_eq!(ch11.current, Some(1500), "电流应被取出");
        assert_eq!(ch11.temp, Some(29815));
        assert_eq!(ch11.batt_status.as_deref(), Some("82"));
        assert_eq!(ch11.pow_status.as_deref(), Some("03"));

        let ch12 = rt.ch_map.get(&12).expect("通道 12 应有实时状态");
        // 0 是**真实读数**，必须原样保留（不能与"无数据"混为一谈）
        assert_eq!(ch12.current, Some(0));
        assert_eq!(ch12.voltage, Some(48000));
    }

    /// 字段缺失/非数字时必须保持 None，绝不落 0（"无数据"不能伪装成 0）
    #[test]
    fn test_parse_cabinet_realtime_missing_fields_stay_none() {
        let comp_ids = vec![7_i64];
        let comp_to_board = vec![(7_i64, (1_i8, 1_i8))];
        // 柜级 4 项 + SOC 1 项 + 通道 5 项，其中电压是非数字垃圾值、电流缺失
        let vals: Vec<Option<String>> = vec![
            None,
            None,
            None,
            None,
            None,
            Some("29815".into()),
            Some("82".into()),
            Some("03".into()),
            Some("abc".into()),
            None,
        ];

        let rt = parse_cabinet_realtime(&vals, &comp_ids, &comp_to_board);

        assert_eq!(rt.temp, None);
        assert_eq!(rt.rssi, None);
        let ch = rt.ch_map.get(&7).expect("通道应存在（缺失也是 None 集合）");
        assert_eq!(ch.voltage, None, "非数字电压必须是 None 而不是 0");
        assert_eq!(ch.current, None, "缺失电流必须是 None 而不是 0");
        assert_eq!(ch.temp, Some(29815));
    }

    /// apply_realtime：只覆盖取到的值，取不到的字段保持占位 null
    #[test]
    fn test_apply_realtime_keeps_null_when_missing() {
        let mut wrap = vec![json!({
            "compartments": [{
                "id": 11,
                "channel_id": 1,
                "status": 0,
                "batt_status": Value::Null,
                "pow_status": Value::Null,
                "voltage": Value::Null,
                "current": Value::Null,
                "temp": Value::Null,
            }]
        })];

        let mut ch_map = std::collections::HashMap::new();
        ch_map.insert(
            11_i64,
            ChannelRealtime {
                temp: None,
                batt_status: Some("82".into()),
                pow_status: None,
                voltage: Some(53200),
                current: None,
            },
        );
        let rt = CabinetRealtime { ch_map, ..Default::default() };

        apply_realtime(&mut wrap, &rt);

        let comp = &wrap[0]["compartments"][0];
        assert_eq!(comp["batt_status"], json!("82"));
        assert_eq!(comp["voltage"], json!(53200));
        assert_eq!(comp["current"], Value::Null, "缺失电流必须保持 null");
        assert_eq!(comp["temp"], Value::Null, "缺失温度必须保持 null");
        assert_eq!(comp["pow_status"], Value::Null);
    }
}