use axum::Json;
use axum::extract::{Extension, FromRef, Path, Query, State};
use axum::response::sse::{Event, KeepAlive, Sse};
use erp_core::health_provider::TimeRange;
use erp_core::rbac::require_permission;
use erp_core::types::{ApiResponse, TenantContext};
use futures::StreamExt;
use serde::Deserialize;
use std::convert::Infallible;

use crate::config_resolver;
use crate::dto::{AnalysisSseEvent, AnalysisType};
use crate::state::AiState;

pub mod chat_handler;
pub mod config_handler;
pub mod insight_handler;
pub mod risk_handler;
pub mod rule_handler;
pub mod suggestion_handler;

// === 分析请求 Body ===

/// 从 prompt.model_config 解析模型参数，缺失字段用 AI 配置默认值填充
async fn resolve_model_config(
    model_config: &serde_json::Value,
    tenant_id: uuid::Uuid,
    db: &sea_orm::DatabaseConnection,
) -> (String, f32, u32) {
    let defaults = config_resolver::load_ai_config(tenant_id, db).await;
    let analysis = &defaults.analysis_defaults;

    let model = model_config
        .get("model")
        .and_then(|v| v.as_str())
        .unwrap_or(&analysis.model)
        .to_string();
    let temperature = model_config
        .get("temperature")
        .and_then(|v| v.as_f64())
        .unwrap_or(analysis.temperature as f64) as f32;
    let max_tokens = model_config
        .get("max_tokens")
        .and_then(|v| v.as_u64())
        .unwrap_or(analysis.max_tokens as u64) as u32;

    (model, temperature, max_tokens)
}

#[derive(Debug, Deserialize, utoipa::ToSchema)]
pub struct AnalyzeBody {
    pub report_id: Option<uuid::Uuid>,
    pub patient_id: Option<uuid::Uuid>,
    pub metrics: Option<Vec<String>>,
    pub source_id: Option<uuid::Uuid>,
}

// === SSE 分析端点 ===

#[utoipa::path(
    post,
    path = "/ai/analyze/lab-report",
    request_body = AnalyzeBody,
    responses((status = 200, description = "SSE 化验报告分析流")),
    tag = "AI 分析",
    security(("bearer_auth" = [])),
)]
pub async fn stream_lab_report<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
    Json(body): Json<AnalyzeBody>,
) -> Result<Sse<impl futures::Stream<Item = Result<Event, Infallible>>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.analysis.manage")?;
    let report_id = body
        .report_id
        .ok_or_else(|| erp_core::error::AppError::Validation("report_id 必填".into()))?;

    let lab_dto = state
        .health_provider
        .get_lab_report(ctx.tenant_id, report_id)
        .await?;

    if lab_dto.items.is_empty() {
        return Err(erp_core::error::AppError::Validation(
            "化验报告缺少检查项目数据，无法进行 AI 分析。请先录入完整的化验指标。".into(),
        ));
    }

    let sanitized_data = state.analysis.sanitizer.sanitize_lab_report(&lab_dto)?;

    let prompt = state
        .prompt
        .get_active_prompt(ctx.tenant_id, "lab_report_interpretation")
        .await?;

    let model_config = &prompt.model_config;
    let (model, temperature, max_tokens) =
        resolve_model_config(model_config, ctx.tenant_id, &state.db).await;

    let (stream, analysis_id, _provider_name) = state
        .analysis
        .stream_analyze(
            ctx.tenant_id,
            ctx.user_id,
            uuid::Uuid::nil(),
            AnalysisType::LabReport,
            report_id.to_string(),
            prompt.system_prompt,
            prompt.user_prompt_template,
            sanitized_data,
            model,
            temperature,
            max_tokens,
        )
        .await?;

    let analysis_id_clone = analysis_id;
    let state_clone = state.clone();
    let patient_id_clone = uuid::Uuid::nil(); // lab report 场景 patient_id 从 report 关联
    let doctor_id_clone = ctx.user_id;

    let sse_stream = build_sse_stream(
        stream,
        analysis_id_clone,
        state_clone,
        "lab_report",
        ctx.tenant_id,
        patient_id_clone,
        doctor_id_clone,
    );
    Ok(Sse::new(sse_stream).keep_alive(KeepAlive::default()))
}

#[utoipa::path(
    post,
    path = "/ai/analyze/trends",
    request_body = AnalyzeBody,
    responses((status = 200, description = "SSE 趋势分析流")),
    tag = "AI 分析",
    security(("bearer_auth" = [])),
)]
pub async fn stream_trends<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
    Json(body): Json<AnalyzeBody>,
) -> Result<Sse<impl futures::Stream<Item = Result<Event, Infallible>>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.analysis.manage")?;
    let patient_id = body
        .patient_id
        .ok_or_else(|| erp_core::error::AppError::Validation("patient_id 必填".into()))?;

    let metrics = body.metrics.unwrap_or_else(|| {
        vec![
            "systolic_bp_morning".into(),
            "diastolic_bp_morning".into(),
            "heart_rate".into(),
            "weight".into(),
            "blood_sugar".into(),
        ]
    });
    let range = TimeRange {
        start: chrono::Utc::now() - chrono::Duration::days(90),
        end: chrono::Utc::now(),
    };

    let trend_data = state
        .health_provider
        .get_trend_analysis_data(ctx.tenant_id, patient_id, &metrics, &range)
        .await?;

    if trend_data.metrics.is_empty() {
        return Err(erp_core::error::AppError::Validation(
            "患者在选定时间段内无体征监测数据，无法进行趋势分析。".into(),
        ));
    }

    let sanitized_data = state
        .analysis
        .sanitizer
        .sanitize_trend_analysis(&trend_data)?;

    let prompt = state
        .prompt
        .get_active_prompt(ctx.tenant_id, "health_trend_analysis")
        .await?;

    let model_config = &prompt.model_config;
    let (model, temperature, max_tokens) =
        resolve_model_config(model_config, ctx.tenant_id, &state.db).await;

    let (stream, analysis_id, _) = state
        .analysis
        .stream_analyze(
            ctx.tenant_id,
            ctx.user_id,
            patient_id,
            AnalysisType::Trends,
            patient_id.to_string(),
            prompt.system_prompt,
            prompt.user_prompt_template,
            sanitized_data,
            model,
            temperature,
            max_tokens,
        )
        .await?;

    let analysis_id_clone = analysis_id;
    let state_clone = state.clone();

    let sse_stream = build_sse_stream(
        stream,
        analysis_id_clone,
        state_clone,
        "trend",
        ctx.tenant_id,
        uuid::Uuid::nil(),
        ctx.user_id,
    );
    Ok(Sse::new(sse_stream).keep_alive(KeepAlive::default()))
}

#[utoipa::path(
    post,
    path = "/ai/analyze/checkup-plan",
    request_body = AnalyzeBody,
    responses((status = 200, description = "SSE 体检计划分析流")),
    tag = "AI 分析",
    security(("bearer_auth" = [])),
)]
pub async fn stream_checkup_plan<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
    Json(body): Json<AnalyzeBody>,
) -> Result<Sse<impl futures::Stream<Item = Result<Event, Infallible>>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.analysis.manage")?;
    let patient_id = body
        .patient_id
        .ok_or_else(|| erp_core::error::AppError::Validation("patient_id 必填".into()))?;

    let summary_dto = state
        .health_provider
        .get_patient_summary(ctx.tenant_id, patient_id)
        .await?;
    let sanitized_data = state
        .analysis
        .sanitizer
        .sanitize_patient_summary(&summary_dto)?;

    let prompt = state
        .prompt
        .get_active_prompt(ctx.tenant_id, "personalized_checkup_plan")
        .await?;

    let model_config = &prompt.model_config;
    let (model, temperature, max_tokens) =
        resolve_model_config(model_config, ctx.tenant_id, &state.db).await;

    let (stream, analysis_id, _) = state
        .analysis
        .stream_analyze(
            ctx.tenant_id,
            ctx.user_id,
            patient_id,
            AnalysisType::CheckupPlan,
            patient_id.to_string(),
            prompt.system_prompt,
            prompt.user_prompt_template,
            sanitized_data,
            model,
            temperature,
            max_tokens,
        )
        .await?;

    let analysis_id_clone = analysis_id;
    let state_clone = state.clone();

    let sse_stream = build_sse_stream(
        stream,
        analysis_id_clone,
        state_clone,
        "checkup_plan",
        ctx.tenant_id,
        uuid::Uuid::nil(),
        ctx.user_id,
    );
    Ok(Sse::new(sse_stream).keep_alive(KeepAlive::default()))
}

#[utoipa::path(
    post,
    path = "/ai/analyze/report-summary",
    request_body = AnalyzeBody,
    responses((status = 200, description = "SSE 报告摘要分析流")),
    tag = "AI 分析",
    security(("bearer_auth" = [])),
)]
pub async fn stream_report_summary<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
    Json(body): Json<AnalyzeBody>,
) -> Result<Sse<impl futures::Stream<Item = Result<Event, Infallible>>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.analysis.manage")?;
    let report_id = body
        .report_id
        .ok_or_else(|| erp_core::error::AppError::Validation("report_id 必填".into()))?;

    let report_dto = state
        .health_provider
        .get_full_report(ctx.tenant_id, report_id)
        .await?;

    if report_dto.sections.is_empty() {
        return Err(erp_core::error::AppError::Validation(
            "健康报告缺少内容数据，无法生成摘要。请先完善报告内容。".into(),
        ));
    }

    let sanitized_data = state
        .analysis
        .sanitizer
        .sanitize_health_report(&report_dto)?;

    let prompt = state
        .prompt
        .get_active_prompt(ctx.tenant_id, "report_summary_generation")
        .await?;

    let model_config = &prompt.model_config;
    let (model, temperature, max_tokens) =
        resolve_model_config(model_config, ctx.tenant_id, &state.db).await;

    let (stream, analysis_id, _) = state
        .analysis
        .stream_analyze(
            ctx.tenant_id,
            ctx.user_id,
            uuid::Uuid::nil(),
            AnalysisType::ReportSummary,
            report_id.to_string(),
            prompt.system_prompt,
            prompt.user_prompt_template,
            sanitized_data,
            model,
            temperature,
            max_tokens,
        )
        .await?;

    let analysis_id_clone = analysis_id;
    let state_clone = state.clone();

    let sse_stream = build_sse_stream(
        stream,
        analysis_id_clone,
        state_clone,
        "report_summary",
        ctx.tenant_id,
        uuid::Uuid::nil(),
        ctx.user_id,
    );
    Ok(Sse::new(sse_stream).keep_alive(KeepAlive::default()))
}

#[utoipa::path(
    post,
    path = "/ai/analyze/follow-up-summary",
    request_body = AnalyzeBody,
    responses((status = 200, description = "SSE 随访小结生成流")),
    tag = "AI 分析",
    security(("bearer_auth" = [])),
)]
pub async fn stream_follow_up_summary<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
    Json(body): Json<AnalyzeBody>,
) -> Result<Sse<impl futures::Stream<Item = Result<Event, Infallible>>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.analysis.manage")?;
    let task_id = body
        .source_id
        .ok_or_else(|| erp_core::error::AppError::Validation("source_id (task_id) 必填".into()))?;

    let data = state
        .health_provider
        .get_follow_up_summary_data(ctx.tenant_id, task_id)
        .await?;

    if data.records.is_empty() {
        return Err(erp_core::error::AppError::Validation(
            "该随访任务尚无随访记录，无法生成小结。请先填写至少一条随访记录。".into(),
        ));
    }

    let sanitized_data = state.analysis.sanitizer.sanitize_follow_up_data(&data)?;

    let prompt = state
        .prompt
        .get_active_prompt(ctx.tenant_id, "follow_up_summary_generation")
        .await?;

    let model_config = &prompt.model_config;
    let (model, temperature, max_tokens) =
        resolve_model_config(model_config, ctx.tenant_id, &state.db).await;

    let (stream, analysis_id, _) = state
        .analysis
        .stream_analyze(
            ctx.tenant_id,
            ctx.user_id,
            data.patient_id,
            AnalysisType::FollowUpSummary,
            task_id.to_string(),
            prompt.system_prompt,
            prompt.user_prompt_template,
            sanitized_data,
            model,
            temperature,
            max_tokens,
        )
        .await?;

    let analysis_id_clone = analysis_id;
    let state_clone = state.clone();
    let patient_id_clone = data.patient_id;

    let sse_stream = build_sse_stream(
        stream,
        analysis_id_clone,
        state_clone,
        "follow_up_summary",
        ctx.tenant_id,
        patient_id_clone,
        ctx.user_id,
    );
    Ok(Sse::new(sse_stream).keep_alive(KeepAlive::default()))
}

// === 分析历史 ===

#[derive(Debug, Deserialize, utoipa::IntoParams)]
pub struct ListAnalysisQuery {
    pub patient_id: Option<uuid::Uuid>,
    pub analysis_type: Option<String>,
    pub page: Option<u64>,
    pub page_size: Option<u64>,
}

#[utoipa::path(
    get,
    path = "/ai/analysis/history",
    params(ListAnalysisQuery),
    responses((status = 200, description = "分析历史列表")),
    tag = "AI 分析",
    security(("bearer_auth" = [])),
)]
pub async fn list_analysis<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
    Query(params): Query<ListAnalysisQuery>,
) -> Result<Json<ApiResponse<serde_json::Value>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.analysis.list")?;
    let pagination = erp_core::types::Pagination {
        page: params.page,
        page_size: params.page_size,
    };
    let (items, total) = state
        .analysis
        .list_analysis(
            ctx.tenant_id,
            params.patient_id,
            params.analysis_type,
            &pagination,
        )
        .await?;

    // 批量查询 patient_name（通过 raw SQL 避免跨 crate 依赖 erp-health）
    let patient_ids: std::collections::HashSet<uuid::Uuid> = items
        .iter()
        .filter(|a| a.patient_id != uuid::Uuid::nil())
        .map(|a| a.patient_id)
        .collect();

    let patient_names: std::collections::HashMap<uuid::Uuid, String> = if !patient_ids.is_empty() {
        #[derive(sea_orm::FromQueryResult)]
        struct PatientName {
            id: uuid::Uuid,
            name: String,
        }
        let ids: Vec<uuid::Uuid> = patient_ids.into_iter().collect();
        use sea_orm::FromQueryResult;
        PatientName::find_by_statement(sea_orm::Statement::from_sql_and_values(
            sea_orm::DatabaseBackend::Postgres,
            "SELECT id, name FROM patient WHERE id = ANY($1) AND tenant_id = $2 AND deleted_at IS NULL",
            [ids.into(), ctx.tenant_id.into()],
        ))
        .all(&state.db)
        .await
        .unwrap_or_default()
        .into_iter()
        .map(|p| (p.id, p.name))
        .collect()
    } else {
        std::collections::HashMap::new()
    };

    let data: Vec<serde_json::Value> = items
        .into_iter()
        .map(|a| {
            let mut val = serde_json::to_value(&a).unwrap_or_default();
            if let Some(obj) = val.as_object_mut() {
                obj.insert(
                    "patient_name".to_string(),
                    serde_json::json!(patient_names.get(&a.patient_id).cloned()),
                );
            }
            val
        })
        .collect();

    Ok(Json(ApiResponse::ok(serde_json::json!({
        "data": data,
        "total": total,
        "page": pagination.page.unwrap_or(1),
        "page_size": pagination.limit(),
    }))))
}

#[utoipa::path(
    get,
    path = "/ai/analysis/{id}",
    responses((status = 200, description = "分析详情")),
    tag = "AI 分析",
    security(("bearer_auth" = [])),
)]
pub async fn get_analysis<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<uuid::Uuid>,
) -> Result<Json<ApiResponse<crate::entity::ai_analysis::Model>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.analysis.list")?;
    let analysis = state.analysis.get_analysis(id, ctx.tenant_id).await?;
    Ok(Json(ApiResponse::ok(analysis)))
}

// === Prompt 管理 ===

#[derive(Debug, Deserialize, utoipa::IntoParams)]
pub struct ListPromptsQuery {
    pub category: Option<String>,
    pub page: Option<u64>,
    pub page_size: Option<u64>,
}

#[utoipa::path(
    get,
    path = "/ai/prompts",
    params(ListPromptsQuery),
    responses((status = 200, description = "Prompt 模板列表")),
    tag = "AI Prompt",
    security(("bearer_auth" = [])),
)]
pub async fn list_prompts<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
    Query(params): Query<ListPromptsQuery>,
) -> Result<Json<ApiResponse<serde_json::Value>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.prompt.list")?;
    let pagination = erp_core::types::Pagination {
        page: params.page,
        page_size: params.page_size,
    };
    let (items, total) = state
        .prompt
        .list_prompts(ctx.tenant_id, params.category, &pagination)
        .await?;
    Ok(Json(ApiResponse::ok(serde_json::json!({
        "data": items,
        "total": total,
        "page": pagination.page.unwrap_or(1),
        "page_size": pagination.limit(),
    }))))
}

#[derive(Debug, Deserialize, utoipa::ToSchema)]
pub struct CreatePromptBody {
    pub name: String,
    pub description: Option<String>,
    pub system_prompt: String,
    pub user_prompt_template: String,
    pub model_config: serde_json::Value,
    pub category: String,
}

#[utoipa::path(
    post,
    path = "/ai/prompts",
    request_body = CreatePromptBody,
    responses((status = 200, description = "创建 Prompt 模板")),
    tag = "AI Prompt",
    security(("bearer_auth" = [])),
)]
pub async fn create_prompt<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
    Json(body): Json<CreatePromptBody>,
) -> Result<Json<ApiResponse<crate::entity::ai_prompt::Model>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.prompt.manage")?;
    validate_prompt_safety(&body.system_prompt)?;
    validate_prompt_safety(&body.user_prompt_template)?;
    let prompt = state
        .prompt
        .create_prompt(
            ctx.tenant_id,
            ctx.user_id,
            body.name,
            body.system_prompt,
            body.user_prompt_template,
            body.model_config,
            body.category,
        )
        .await?;
    Ok(Json(ApiResponse::ok(prompt)))
}

#[utoipa::path(
    post,
    path = "/ai/prompts/{id}/activate",
    responses((status = 200, description = "激活 Prompt 模板")),
    tag = "AI Prompt",
    security(("bearer_auth" = [])),
)]
pub async fn activate_prompt<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<uuid::Uuid>,
) -> Result<Json<ApiResponse<crate::entity::ai_prompt::Model>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.prompt.manage")?;
    let prompt = state.prompt.activate_prompt(id, ctx.tenant_id).await?;
    Ok(Json(ApiResponse::ok(prompt)))
}

#[utoipa::path(
    post,
    path = "/ai/prompts/{id}/rollback",
    responses((status = 200, description = "回滚 Prompt 模板")),
    tag = "AI Prompt",
    security(("bearer_auth" = [])),
)]
pub async fn rollback_prompt<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<uuid::Uuid>,
) -> Result<Json<ApiResponse<crate::entity::ai_prompt::Model>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.prompt.manage")?;
    let prompt = state.prompt.rollback_prompt(id, ctx.tenant_id).await?;
    Ok(Json(ApiResponse::ok(prompt)))
}

// === 用量统计 ===

#[utoipa::path(
    get,
    path = "/ai/usage/overview",
    responses((status = 200, description = "AI 用量概览")),
    tag = "AI 用量",
    security(("bearer_auth" = [])),
)]
pub async fn usage_overview<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
) -> Result<Json<ApiResponse<serde_json::Value>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.usage.list")?;
    let overview = state.usage.get_overview(ctx.tenant_id).await?;
    Ok(Json(ApiResponse::ok(serde_json::json!({
        "total_count": overview.total_count,
    }))))
}

#[utoipa::path(
    get,
    path = "/ai/usage/by-type",
    responses((status = 200, description = "按类型用量统计")),
    tag = "AI 用量",
    security(("bearer_auth" = [])),
)]
pub async fn usage_by_type<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
) -> Result<Json<ApiResponse<Vec<serde_json::Value>>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.usage.list")?;
    let types = state.usage.get_by_type(ctx.tenant_id).await?;
    let result: Vec<serde_json::Value> = types
        .into_iter()
        .map(|t| {
            serde_json::json!({
                "analysis_type": t.analysis_type,
                "count": t.count,
            })
        })
        .collect();
    Ok(Json(ApiResponse::ok(result)))
}

// === Provider 管理 ===

#[utoipa::path(
    get,
    path = "/ai/providers/health",
    responses((status = 200, description = "AI Provider 健康检查")),
    tag = "AI Provider",
    security(("bearer_auth" = [])),
)]
pub async fn provider_health<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
) -> Result<Json<ApiResponse<serde_json::Value>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.analysis.list")?;
    let statuses = state.provider_registry.health_check_all().await;
    let result: serde_json::Value = statuses.iter().map(|entry| {
        let (name, health) = entry.pair();
        serde_json::json!({
            "provider": name,
            "healthy": health.is_healthy(),
            "status": match health {
                crate::provider::registry::ProviderHealth::Healthy { last_check } =>
                    serde_json::json!({"status": "healthy", "last_check": last_check.to_rfc3339()}),
                crate::provider::registry::ProviderHealth::Degraded { last_check, error } =>
                    serde_json::json!({"status": "degraded", "last_check": last_check.to_rfc3339(), "error": error}),
                crate::provider::registry::ProviderHealth::Unavailable { since, error } =>
                    serde_json::json!({"status": "unavailable", "since": since.to_rfc3339(), "error": error}),
            },
        })
    }).collect();
    Ok(Json(ApiResponse::ok(result)))
}

#[utoipa::path(
    get,
    path = "/ai/providers",
    responses((status = 200, description = "AI Provider 列表")),
    tag = "AI Provider",
    security(("bearer_auth" = [])),
)]
pub async fn provider_names<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
) -> Result<Json<ApiResponse<Vec<String>>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.analysis.list")?;
    Ok(Json(ApiResponse::ok(
        state.provider_registry.provider_names(),
    )))
}

#[utoipa::path(
    get,
    path = "/ai/quota/summary",
    responses((status = 200, description = "AI 配额汇总")),
    tag = "AI 用量",
    security(("bearer_auth" = [])),
)]
pub async fn quota_summary<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
) -> Result<Json<ApiResponse<crate::service::quota::QuotaSummary>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.usage.list")?;
    let summary = state.quota.get_usage_summary(ctx.tenant_id).await?;
    Ok(Json(ApiResponse::ok(summary)))
}

// === 透析风险评估（KDIGO 规则） ===

#[utoipa::path(
    post,
    path = "/ai/dialysis/risk-assessment",
    responses((status = 200, description = "透析风险评估")),
    tag = "AI 分析",
    security(("bearer_auth" = [])),
)]
pub async fn assess_dialysis_risk<S>(
    Extension(ctx): Extension<TenantContext>,
    Json(body): Json<crate::service::dialysis_risk_scorer::DialysisLabInput>,
) -> Result<
    Json<ApiResponse<crate::service::dialysis_risk_scorer::DialysisRiskAssessment>>,
    erp_core::error::AppError,
>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.analysis.manage")?;
    let scorer = crate::service::dialysis_risk_scorer::DialysisRiskScorer::new();
    let result = scorer.assess(&body);
    Ok(Json(ApiResponse::ok(result)))
}

// === 成本与预算 ===

#[utoipa::path(
    get,
    path = "/ai/budget/status",
    responses((status = 200, description = "AI 预算状态")),
    tag = "AI 用量",
    security(("bearer_auth" = [])),
)]
pub async fn budget_status<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
) -> Result<Json<ApiResponse<crate::service::cost::BudgetStatus>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.usage.list")?;
    let cost_svc = crate::service::cost::CostService::new(state.db.clone());
    let status = cost_svc.get_budget_status(ctx.tenant_id).await?;
    Ok(Json(ApiResponse::ok(status)))
}

#[derive(Debug, Deserialize)]
pub struct CostEstimateQuery {
    pub analysis_type: String,
    pub model: Option<String>,
}

#[utoipa::path(
    get,
    path = "/ai/cost/estimate",
    responses((status = 200, description = "AI 成本预估")),
    tag = "AI 用量",
    security(("bearer_auth" = [])),
)]
pub async fn cost_estimate<S>(
    Extension(ctx): Extension<TenantContext>,
    Query(params): Query<CostEstimateQuery>,
) -> Result<Json<ApiResponse<crate::service::cost::CostEstimate>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.usage.list")?;
    let model = params
        .model
        .unwrap_or_else(|| "claude-sonnet-4-6".to_string());
    let estimate = crate::service::cost::CostService::estimate_cost(&params.analysis_type, &model);
    Ok(Json(ApiResponse::ok(estimate)))
}

// === AI 管理看板 ===

#[derive(Debug, Deserialize, utoipa::IntoParams)]
pub struct DailyUsageQuery {
    pub start_date: String,
    pub end_date: String,
}

#[utoipa::path(
    get,
    path = "/ai/admin/daily-usage",
    params(DailyUsageQuery),
    responses((status = 200, description = "按日聚合用量")),
    tag = "AI 管理",
    security(("bearer_auth" = [])),
)]
pub async fn admin_daily_usage<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
    Query(params): Query<DailyUsageQuery>,
) -> Result<Json<ApiResponse<serde_json::Value>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.admin.dashboard")?;

    let start_date = chrono::NaiveDate::parse_from_str(&params.start_date, "%Y-%m-%d")
        .map_err(|_| erp_core::error::AppError::Validation("start_date 格式错误".into()))?;
    let end_date = chrono::NaiveDate::parse_from_str(&params.end_date, "%Y-%m-%d")
        .map_err(|_| erp_core::error::AppError::Validation("end_date 格式错误".into()))?;

    let rows = state
        .usage
        .get_daily_usage(ctx.tenant_id, start_date, end_date)
        .await?;

    Ok(Json(ApiResponse::ok(serde_json::json!({
        "data": rows,
        "start_date": params.start_date,
        "end_date": params.end_date,
    }))))
}

#[utoipa::path(
    get,
    path = "/ai/admin/flags",
    responses((status = 200, description = "功能开关列表")),
    tag = "AI 管理",
    security(("bearer_auth" = [])),
)]
pub async fn admin_list_flags<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
) -> Result<
    Json<ApiResponse<Vec<crate::service::feature_flag_service::FeatureFlag>>>,
    erp_core::error::AppError,
>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.admin.flags")?;
    let flags = state.feature_flags.get_all(ctx.tenant_id).await?;
    Ok(Json(ApiResponse::ok(flags)))
}

#[derive(Debug, Deserialize, utoipa::ToSchema)]
pub struct UpdateFlagBody {
    pub feature: String,
    pub enabled: bool,
}

#[utoipa::path(
    post,
    path = "/ai/admin/flags",
    request_body = UpdateFlagBody,
    responses((status = 200, description = "更新功能开关")),
    tag = "AI 管理",
    security(("bearer_auth" = [])),
)]
pub async fn admin_update_flag<S>(
    State(state): State<AiState>,
    Extension(ctx): Extension<TenantContext>,
    Json(body): Json<UpdateFlagBody>,
) -> Result<Json<ApiResponse<serde_json::Value>>, erp_core::error::AppError>
where
    AiState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "ai.admin.flags")?;
    state
        .feature_flags
        .set_enabled(ctx.tenant_id, &body.feature, body.enabled, ctx.user_id)
        .await?;
    Ok(Json(ApiResponse::ok(serde_json::json!({
        "feature": body.feature,
        "enabled": body.enabled,
    }))))
}

// === SSE 流构建辅助 ===

fn build_sse_stream(
    stream: std::pin::Pin<Box<dyn futures::Stream<Item = crate::error::AiResult<String>> + Send>>,
    analysis_id: uuid::Uuid,
    state: AiState,
    analysis_type: &'static str,
    tenant_id: uuid::Uuid,
    patient_id: uuid::Uuid,
    doctor_id: uuid::Uuid,
) -> impl futures::Stream<Item = Result<Event, Infallible>> {
    async_stream::stream! {
        let mut full_content = String::new();
        let mut index: u32 = 0;

        let mut stream = std::pin::pin!(stream);
        while let Some(result) = stream.next().await {
            match result {
                Ok(chunk) => {
                    full_content.push_str(&chunk);
                    index += 1;
                    let event = AnalysisSseEvent::Chunk { content: chunk, index };
                    let data = serde_json::to_string(&event).unwrap_or_default();
                    yield Ok(Event::default().event("chunk").data(data));
                }
                Err(e) => {
                    let event = AnalysisSseEvent::Error { message: e.to_string() };
                    let data = serde_json::to_string(&event).unwrap_or_default();
                    yield Ok(Event::default().event("error").data(data));
                    let _ = state.analysis.fail_analysis(analysis_id, e.to_string()).await;
                    // 发布 AI 分析失败事件
                    let fail_event = erp_core::events::DomainEvent::new(
                        "ai.analysis.failed",
                        tenant_id,
                        erp_core::events::build_event_payload(serde_json::json!({
                            "analysis_id": analysis_id,
                            "error": e.to_string(),
                        })),
                    );
                    state.event_bus.publish(fail_event, &state.db).await;
                    return;
                }
            }
        }

        let metadata = serde_json::json!({"analysis_type": analysis_type});
        let _ = state.analysis.complete_analysis(analysis_id, full_content.clone(), metadata.clone()).await;

        // 记录用量的估算 token 消耗（SSE 模式无法获取精确 token 数，按 4 字符 ≈ 1 token 估算）
        let est_output_tokens = (full_content.len() as u32) / 4;
        if let Err(e) = state.usage.log_usage(
            tenant_id,
            "sse",
            "",
            analysis_type,
            0,
            est_output_tokens,
            0,
            0,
            false,
        ).await {
            tracing::warn!(error = %e, "Failed to log SSE analysis usage");
        }

        // 后处理：解析双通道输出、创建建议、发布事件
        crate::service::post_process::post_process_analysis(
            &state,
            analysis_id,
            &full_content,
            tenant_id,
            patient_id,
            doctor_id,
            analysis_type,
            metadata,
        ).await;

        let done_event = AnalysisSseEvent::Done {
            analysis_id,
            status: "completed".into(),
        };
        let data = serde_json::to_string(&done_event).unwrap_or_default();
        yield Ok(Event::default().event("done").data(data));
    }
}

/// 检查提示词内容是否包含可疑注入模式
fn validate_prompt_safety(content: &str) -> Result<(), erp_core::error::AppError> {
    let suspicious = [
        "ignore previous",
        "ignore all previous",
        "ignore above",
        "disregard previous",
        "you are now",
        "new instructions:",
    ];
    let lower = content.to_lowercase();
    for pattern in &suspicious {
        if lower.contains(pattern) {
            return Err(erp_core::error::AppError::Validation(format!(
                "提示词内容包含不安全模式: {}",
                pattern
            )));
        }
    }
    Ok(())
}