use axum::Extension;
use axum::extract::{FromRef, Json, Path, Query, State};
use sea_orm::{ColumnTrait, EntityTrait, QueryFilter};
use serde::Deserialize;
use utoipa::IntoParams;
use uuid::Uuid;

use erp_core::error::AppError;
use erp_core::rbac::require_permission;
use erp_core::types::{ApiResponse, PaginatedResponse, TenantContext};

use crate::dto::consultation_dto::*;
use crate::service::consultation_service;
use crate::state::HealthState;

#[derive(Debug, Deserialize, IntoParams)]
pub struct SessionListParams {
    pub page: Option<u64>,
    pub page_size: Option<u64>,
    pub status: Option<String>,
    pub patient_id: Option<Uuid>,
    pub doctor_id: Option<Uuid>,
}

#[derive(Debug, Deserialize, IntoParams)]
pub struct MessageListParams {
    pub page: Option<u64>,
    pub page_size: Option<u64>,
    pub after_id: Option<Uuid>,
}

#[derive(Debug, Deserialize, IntoParams)]
pub struct PollMessagesParams {
    pub after_id: Option<Uuid>,
    /// 超时秒数，默认 25，最大 30
    pub timeout: Option<u64>,
}

#[derive(Debug, serde::Deserialize, utoipa::ToSchema)]
pub struct CloseSessionReq {
    pub version: i32,
}

#[derive(Debug, serde::Deserialize, utoipa::ToSchema)]
pub struct CreateConsultationMessageReq {
    pub session_id: Uuid,
    pub content_type: Option<String>,
    pub content: String,
}

#[derive(Debug, Deserialize, IntoParams)]
pub struct ExportSessionsParams {
    pub status: Option<String>,
    pub patient_id: Option<Uuid>,
    pub doctor_id: Option<Uuid>,
    pub page: Option<u64>,
    pub page_size: Option<u64>,
}

pub async fn create_session<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Json(req): Json<CreateSessionReq>,
) -> Result<Json<ApiResponse<SessionResp>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.consultation.manage")?;
    let result =
        consultation_service::create_session(&state, ctx.tenant_id, Some(ctx.user_id), req).await?;
    Ok(Json(ApiResponse::ok(result)))
}

pub async fn list_sessions<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Query(params): Query<SessionListParams>,
) -> Result<Json<ApiResponse<PaginatedResponse<SessionResp>>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.consultation.list")?;
    let page = params.page.unwrap_or(1);
    let page_size = params.page_size.unwrap_or(20);
    let result = consultation_service::list_sessions(
        &state,
        ctx.tenant_id,
        page,
        page_size,
        params.status,
        params.patient_id,
        params.doctor_id,
    )
    .await?;
    Ok(Json(ApiResponse::ok(result)))
}

pub async fn get_session<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
) -> Result<Json<ApiResponse<SessionResp>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.consultation.list")?;
    let result = consultation_service::get_session(&state, ctx.tenant_id, id).await?;
    Ok(Json(ApiResponse::ok(result)))
}

pub async fn list_messages<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(session_id): Path<Uuid>,
    Query(params): Query<MessageListParams>,
) -> Result<Json<ApiResponse<PaginatedResponse<MessageResp>>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.consultation.list")?;
    let page = params.page.unwrap_or(1);
    let page_size = params.page_size.unwrap_or(20);
    let result = consultation_service::list_messages(
        &state,
        ctx.tenant_id,
        session_id,
        page,
        page_size,
        params.after_id,
    )
    .await?;
    Ok(Json(ApiResponse::ok(result)))
}

/// 长轮询咨询消息 — 有新消息立即返回，否则挂起等待（最多 timeout 秒）。
pub async fn poll_messages<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(session_id): Path<Uuid>,
    Query(params): Query<PollMessagesParams>,
) -> Result<Json<ApiResponse<Vec<MessageResp>>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.consultation.list")?;
    let timeout_secs = params.timeout.unwrap_or(25).min(30);
    let result = consultation_service::poll_new_messages(
        &state,
        ctx.tenant_id,
        session_id,
        params.after_id,
        timeout_secs,
    )
    .await?;
    Ok(Json(ApiResponse::ok(result)))
}

pub async fn close_session<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
    Json(req): Json<CloseSessionReq>,
) -> Result<Json<ApiResponse<SessionResp>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.consultation.manage")?;
    let result = consultation_service::close_session(
        &state,
        ctx.tenant_id,
        id,
        Some(ctx.user_id),
        req.version,
    )
    .await?;
    Ok(Json(ApiResponse::ok(result)))
}

pub async fn create_message<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Json(req): Json<CreateConsultationMessageReq>,
) -> Result<Json<ApiResponse<MessageResp>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.consultation.manage")?;
    // 从 JWT 身份推导 sender_role，不信任客户端输入
    let is_doctor = crate::entity::doctor_profile::Entity::find()
        .filter(crate::entity::doctor_profile::Column::UserId.eq(ctx.user_id))
        .filter(crate::entity::doctor_profile::Column::TenantId.eq(ctx.tenant_id))
        .filter(crate::entity::doctor_profile::Column::DeletedAt.is_null())
        .one(&state.db)
        .await
        .map_err(|e| AppError::Internal(e.to_string()))?
        .is_some();
    let sender_role = if is_doctor { "doctor" } else { "patient" }.to_string();
    let mut msg_req = CreateMessageReq {
        session_id: req.session_id,
        content_type: req.content_type,
        content: req.content,
    };
    msg_req.sanitize();
    let result = consultation_service::create_message(
        &state,
        ctx.tenant_id,
        Some(ctx.user_id),
        ctx.user_id,
        sender_role,
        msg_req,
    )
    .await?;
    Ok(Json(ApiResponse::ok(result)))
}

pub async fn export_sessions<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Query(params): Query<ExportSessionsParams>,
) -> Result<Json<ApiResponse<PaginatedResponse<SessionResp>>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.consultation.list")?;
    let result = consultation_service::export_sessions(
        &state,
        ctx.tenant_id,
        params.status,
        params.patient_id,
        params.doctor_id,
        params.page,
        params.page_size,
    )
    .await?;
    Ok(Json(ApiResponse::ok(result)))
}

/// 标记会话消息为已读。
#[utoipa::path(
    put,
    path = "/consultation-sessions/{id}/read",
    responses(
        (status = 200, description = "标记成功"),
        (status = 404, description = "会话不存在"),
    ),
    tag = "咨询管理",
)]
pub async fn mark_session_read<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
) -> Result<Json<ApiResponse<()>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.consultation.manage")?;
    let is_doctor = crate::entity::doctor_profile::Entity::find()
        .filter(crate::entity::doctor_profile::Column::UserId.eq(ctx.user_id))
        .filter(crate::entity::doctor_profile::Column::TenantId.eq(ctx.tenant_id))
        .filter(crate::entity::doctor_profile::Column::DeletedAt.is_null())
        .one(&state.db)
        .await
        .map_err(|e| AppError::Internal(e.to_string()))?
        .is_some();
    let role = if is_doctor { "doctor" } else { "patient" };
    consultation_service::mark_session_read(&state, ctx.tenant_id, id, ctx.user_id, role).await?;
    Ok(Json(ApiResponse::ok(())))
}

/// 获取当前医生的仪表盘数据。
#[utoipa::path(
    get,
    path = "/doctor/dashboard",
    responses(
        (status = 200, description = "仪表盘数据"),
    ),
    tag = "医护端",
)]
pub async fn get_doctor_dashboard<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
) -> Result<Json<ApiResponse<consultation_service::DoctorDashboard>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.consultation.list")?;
    let mut result =
        consultation_service::get_doctor_dashboard(&state, ctx.tenant_id, ctx.user_id).await?;
    consultation_service::enrich_doctor_dashboard_health(
        &state,
        ctx.tenant_id,
        ctx.user_id,
        &mut result,
    )
    .await?;
    Ok(Json(ApiResponse::ok(result)))
}