use async_trait::async_trait;
use axum::Router;
use erp_core::module::{ErpModule, ModuleType, PermissionDescriptor};
use std::any::Any;

pub struct AiModule;

#[async_trait]
impl ErpModule for AiModule {
    fn name(&self) -> &str {
        "ai"
    }

    fn module_type(&self) -> ModuleType {
        ModuleType::Builtin
    }

    fn dependencies(&self) -> Vec<&str> {
        vec!["health"]
    }

    fn permissions(&self) -> Vec<PermissionDescriptor> {
        vec![
            PermissionDescriptor {
                code: "ai.analysis.list".into(),
                name: "查看分析历史".into(),
                description: "查看 AI 分析结果历史记录".into(),
                module: "ai".into(),
            },
            PermissionDescriptor {
                code: "ai.analysis.manage".into(),
                name: "请求分析".into(),
                description: "发起 AI 分析请求".into(),
                module: "ai".into(),
            },
            PermissionDescriptor {
                code: "ai.prompt.list".into(),
                name: "查看 Prompt".into(),
                description: "查看 AI Prompt 模板列表".into(),
                module: "ai".into(),
            },
            PermissionDescriptor {
                code: "ai.prompt.manage".into(),
                name: "管理 Prompt".into(),
                description: "创建/编辑/激活/回滚 Prompt 模板".into(),
                module: "ai".into(),
            },
            PermissionDescriptor {
                code: "ai.usage.list".into(),
                name: "查看用量".into(),
                description: "查看 AI 用量统计".into(),
                module: "ai".into(),
            },
            PermissionDescriptor {
                code: "ai.provider.manage".into(),
                name: "管理提供商".into(),
                description: "管理 AI 提供商配置".into(),
                module: "ai".into(),
            },
            PermissionDescriptor {
                code: "ai.suggestion.list".into(),
                name: "查看 AI 建议".into(),
                description: "查看 AI 分析生成的建议列表".into(),
                module: "ai".into(),
            },
            PermissionDescriptor {
                code: "ai.suggestion.manage".into(),
                name: "审批 AI 建议".into(),
                description: "批准或拒绝 AI 建议".into(),
                module: "ai".into(),
            },
        ]
    }

    fn as_any(&self) -> &dyn Any {
        self
    }

    async fn on_startup(
        &self,
        ctx: &erp_core::module::ModuleContext,
    ) -> erp_core::error::AppResult<()> {
        let (mut rx, _handle) = ctx.event_bus.subscribe_filtered("ai.reanalysis.".to_string());
        let db = ctx.db.clone();

        tokio::spawn(async move {
            loop {
                match rx.recv().await {
                    Some(event) if event.event_type == "ai.reanalysis.requested" => {
                        let suggestion_id = event.payload.get("original_suggestion_id")
                            .and_then(|v| v.as_str())
                            .and_then(|s| uuid::Uuid::parse_str(s).ok());
                        let patient_id = event.payload.get("patient_id")
                            .and_then(|v| v.as_str())
                            .and_then(|s| uuid::Uuid::parse_str(s).ok());

                        match (suggestion_id, patient_id) {
                            (Some(sid), Some(pid)) => {
                                if let Err(e) = crate::service::reanalysis::handle_reanalysis_requested(
                                    &db, event.tenant_id, sid, pid,
                                ).await {
                                    tracing::warn!(
                                        suggestion_id = %sid,
                                        error = %e,
                                        "AI 再分析处理失败"
                                    );
                                }
                            }
                            _ => {
                                tracing::warn!("ai.reanalysis.requested 事件缺少必要字段");
                            }
                        }
                    }
                    Some(_) => {}
                    None => {
                        tracing::info!("AI 再分析事件订阅通道已关闭");
                        break;
                    }
                }
            }
        });

        tracing::info!(module = "ai", "AI 模块事件处理器已注册（监听 reanalysis）");
        Ok(())
    }
}

impl AiModule {
    pub fn public_routes<S>() -> Router<S>
    where
        crate::state::AiState: axum::extract::FromRef<S>,
        S: Clone + Send + Sync + 'static,
    {
        Router::new()
    }

    pub fn protected_routes<S>() -> Router<S>
    where
        crate::state::AiState: axum::extract::FromRef<S>,
        S: Clone + Send + Sync + 'static,
    {
        Router::new()
            .route(
                "/ai/analyze/lab-report",
                axum::routing::post(crate::handler::stream_lab_report),
            )
            .route(
                "/ai/analyze/trends",
                axum::routing::post(crate::handler::stream_trends),
            )
            .route(
                "/ai/analyze/checkup-plan",
                axum::routing::post(crate::handler::stream_checkup_plan),
            )
            .route(
                "/ai/analyze/report-summary",
                axum::routing::post(crate::handler::stream_report_summary),
            )
            .route(
                "/ai/analysis/history",
                axum::routing::get(crate::handler::list_analysis),
            )
            .route(
                "/ai/analysis/{id}",
                axum::routing::get(crate::handler::get_analysis),
            )
            .route(
                "/ai/prompts",
                axum::routing::get(crate::handler::list_prompts),
            )
            .route(
                "/ai/prompts",
                axum::routing::post(crate::handler::create_prompt),
            )
            .route(
                "/ai/prompts/{id}/activate",
                axum::routing::post(crate::handler::activate_prompt),
            )
            .route(
                "/ai/prompts/{id}/rollback",
                axum::routing::post(crate::handler::rollback_prompt),
            )
            .route(
                "/ai/usage/overview",
                axum::routing::get(crate::handler::usage_overview),
            )
            .route(
                "/ai/usage/by-type",
                axum::routing::get(crate::handler::usage_by_type),
            )
            .route(
                "/ai/suggestions",
                axum::routing::get(crate::handler::suggestion_handler::list_suggestions),
            )
            .route(
                "/ai/suggestions/{id}/approve",
                axum::routing::post(crate::handler::suggestion_handler::approve_suggestion),
            )
            .route(
                "/ai/suggestions/{id}/comparison",
                axum::routing::get(crate::handler::suggestion_handler::get_comparison),
            )
    }
}