use std::time::Duration;

use super::Error;
use crate::constants::{ACCOUNT, ACTIVE_APP, APP_NODE, DELETED_APP, NEW_APP_REQ};
use crate::db;
use crate::db::general::Report;
use crate::old_brain;
use detee_shared::app_proto;
use serde::{Deserialize, Serialize};
use surrealdb::engine::remote::ws::Client;
use surrealdb::sql::Datetime;
use surrealdb::{Notification, RecordId, Surreal};
use tokio_stream::StreamExt;

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct AppNode {
    pub id: RecordId,
    pub operator: RecordId,
    pub country: String,
    pub region: String,
    pub city: String,
    pub ip: String,
    pub avail_mem_mb: u32,
    pub avail_vcpus: u32,
    pub avail_storage_gbs: u32,
    pub avail_ports: u32,
    pub max_ports_per_app: u32,
    pub price: u64,
    pub offline_minutes: u64,
}

impl AppNode {
    pub async fn register(self, db: &Surreal<Client>) -> Result<AppNode, Error> {
        db::Account::get_or_create(db, &self.operator.key().to_string()).await?;
        let app_node_id = self.id.clone();
        let app_node: Option<AppNode> = db.upsert(app_node_id.clone()).content(self).await?;
        app_node.ok_or(Error::FailedToCreateDBEntry(format!("{APP_NODE}:{app_node_id}")))
    }
}

pub enum AppDaemonMsg {
    Create(NewAppReq),
    Delete(DeletedApp),
}

impl From<NewAppReq> for AppDaemonMsg {
    fn from(value: NewAppReq) -> Self {
        Self::Create(value)
    }
}

impl From<DeletedApp> for AppDaemonMsg {
    fn from(value: DeletedApp) -> Self {
        Self::Delete(value)
    }
}

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct NewAppReq {
    pub id: RecordId,
    #[serde(rename = "in")]
    pub admin: RecordId,
    #[serde(rename = "out")]
    pub app_node: RecordId,
    pub app_name: String,
    pub package_url: String,
    pub mr_enclave: String,
    pub hratls_pubkey: String,
    pub ports: Vec<u32>,
    pub memory_mb: u32,
    pub vcpu: u32,
    pub disk_mb: u32,
    pub locked_nano: u64,
    pub price_per_unit: u64,
    pub error: String,
    pub created_at: Datetime,
}

impl NewAppReq {
    pub async fn get(db: &Surreal<Client>, id: &str) -> Result<Option<Self>, Error> {
        let new_app_req: Option<Self> = db.select((NEW_APP_REQ, id)).await?;
        Ok(new_app_req)
    }
    pub async fn submit_error(
        db: &Surreal<Client>,
        id: &str,
        error: String,
    ) -> Result<Option<Self>, Error> {
        #[derive(Serialize)]
        struct NewAppError {
            error: String,
        }

        let record: Option<Self> =
            db.update((NEW_APP_REQ, id)).merge(NewAppError { error }).await?;

        Ok(record)
    }

    pub async fn submit(self, db: &Surreal<Client>) -> Result<Vec<Self>, Error> {
        let new_app_req: Vec<Self> = db.insert(NEW_APP_REQ).relation(self).await?;
        Ok(new_app_req)
    }
}

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct AppNodeWithReports {
    pub id: RecordId,
    pub operator: RecordId,
    pub country: String,
    pub region: String,
    pub city: String,
    pub ip: String,
    pub avail_mem_mb: u32,
    pub avail_vcpus: u32,
    pub avail_storage_gbs: u32,
    pub avail_ports: u32,
    pub max_ports_per_app: u32,
    pub price: u64,
    pub offline_minutes: u64,
    pub reports: Vec<Report>,
}

impl AppNodeWithReports {
    pub async fn find_by_filters(
        db: &Surreal<Client>,
        filters: app_proto::AppNodeFilters,
        limit_one: bool,
    ) -> Result<Vec<Self>, Error> {
        let mut filter_query = format!(
            "select *, <-report.* from {APP_NODE} where
            avail_ports >= {} &&
            max_ports_per_app >= {} &&
            avail_vcpus >= {} &&
            avail_mem_mb >= {} &&
            avail_storage_gbs >= {} ",
            filters.free_ports,
            filters.free_ports,
            filters.vcpus,
            filters.memory_mb,
            filters.storage_mb
        );

        if !filters.city.is_empty() {
            filter_query += &format!("&& city = '{}' ", filters.city);
        }
        if !filters.region.is_empty() {
            filter_query += &format!("&& region = '{}' ", filters.region);
        }
        if !filters.country.is_empty() {
            filter_query += &format!("&& country = '{}' ", filters.country);
        }
        if !filters.ip.is_empty() {
            filter_query += &format!("&& ip = '{}' ", filters.ip);
        }

        if limit_one {
            filter_query += "limit 1";
        }

        filter_query += ";";
        let mut query_resp = db.query(filter_query).await?;
        let app_nodes: Vec<Self> = query_resp.take(0)?;
        Ok(app_nodes)
    }
}

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct ActiveApp {
    pub id: RecordId,
    #[serde(rename = "in")]
    pub admin: RecordId,
    #[serde(rename = "out")]
    pub app_node: RecordId,
    pub app_name: String,
    pub mapped_ports: Vec<(u64, u64)>,
    pub host_ipv4: String,
    pub vcpus: u64,
    pub memory_mb: u64,
    pub disk_size_gb: u64,
    pub created_at: Datetime,
    pub price_per_unit: u64,
    pub locked_nano: u64,
    pub collected_at: Datetime,
    pub mr_enclave: String,
    pub package_url: String,
    pub hratls_pubkey: String,
}

impl From<ActiveApp> for DeletedApp {
    fn from(value: ActiveApp) -> Self {
        Self {
            id: value.id,
            admin: value.admin,
            app_node: value.app_node,
            app_name: value.app_name,
            mapped_ports: value.mapped_ports,
            host_ipv4: value.host_ipv4,
            vcpus: value.vcpus,
            memory_mb: value.memory_mb,
            disk_size_gb: value.disk_size_gb,
            created_at: value.created_at,
            price_per_unit: value.price_per_unit,
            locked_nano: value.locked_nano,
            collected_at: value.collected_at,
            mr_enclave: value.mr_enclave,
            package_url: value.package_url,
            hratls_pubkey: value.hratls_pubkey,
        }
    }
}

impl ActiveApp {
    pub fn price_per_minute(&self) -> u64 {
        (self.total_units() * self.price_per_unit as f64) as u64
    }

    fn total_units(&self) -> f64 {
        // TODO: Optimize this based on price of hardware.
        (self.vcpus as f64 * 5f64) + (self.memory_mb as f64 / 200f64) + (self.disk_size_gb as f64)
    }

    pub async fn activate(db: &Surreal<Client>, id: &str) -> Result<(), Error> {
        let new_app_req = match NewAppReq::get(db, id).await? {
            Some(r) => r,
            None => return Ok(()),
        };

        let active_app = Self {
            id: RecordId::from((ACTIVE_APP, id)),
            admin: new_app_req.admin,
            app_node: new_app_req.app_node,
            app_name: new_app_req.app_name,
            mapped_ports: vec![],
            host_ipv4: String::new(),
            vcpus: new_app_req.vcpu as u64,
            memory_mb: new_app_req.memory_mb as u64,
            disk_size_gb: new_app_req.disk_mb as u64,
            created_at: new_app_req.created_at.clone(),
            price_per_unit: new_app_req.price_per_unit,
            locked_nano: new_app_req.locked_nano,
            collected_at: new_app_req.created_at,
            mr_enclave: new_app_req.mr_enclave.clone(),
            package_url: new_app_req.package_url.clone(),
            hratls_pubkey: new_app_req.hratls_pubkey.clone(),
        };

        let _: Vec<ActiveApp> = db.insert(()).relation(active_app).await?;

        Ok(())
    }

    pub async fn delete(db: &Surreal<Client>, id: &str) -> Result<bool, Error> {
        let deleted_app: Option<Self> = db.delete((ACTIVE_APP, id)).await?;
        if let Some(deleted_app) = deleted_app {
            let deleted_app: DeletedApp = deleted_app.into();
            let _: Vec<DeletedApp> = db.insert(DELETED_APP).relation(deleted_app).await?;
            Ok(true)
        } else {
            Ok(false)
        }
    }
    pub async fn listen(db: &Surreal<Client>, app_id: &str) -> Result<ActiveApp, Error> {
        let mut query_response = db
            .query(format!(
                "live select error from {NEW_APP_REQ} where id = {NEW_APP_REQ}:{app_id};"
            ))
            .query(format!("live select * from {ACTIVE_APP} where id = {ACTIVE_APP}:{app_id};"))
            .await?;

        let mut error_stream = query_response.stream::<Notification<db::ErrorFromTable>>(0)?;
        let mut active_app_stream = query_response.stream::<Notification<ActiveApp>>(1)?;

        tokio::time::timeout(Duration::from_secs(30), async {
            loop {
                tokio::select! {
                    Some(err_notif) = error_stream.next() =>{
                        match err_notif{
                            Ok(err_notif) =>{
                                if err_notif.action == surrealdb::Action::Update && !err_notif.data.error.is_empty(){
                                    return Err(Error::NewAppDaemonResp(err_notif.data.error))
                                }
                            }
                            Err(e) => return Err(e.into())
                        }

                    }
                    Some(active_app_notif) = active_app_stream.next() => {
                        match active_app_notif {
                            Ok(active_app_notif) =>{
                                if active_app_notif.action == surrealdb::Action::Create {
                                    let _: Option<NewAppReq> = db.delete((NEW_APP_REQ, app_id)).await?;
                                    return Ok(active_app_notif.data);
                                }
                            }
                            Err(e) => return Err(e.into())
                        }
                    }
                }
            }
        })
        .await?
    }
}

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct ActiveAppWithNode {
    pub id: RecordId,
    #[serde(rename = "in")]
    pub admin: RecordId,
    #[serde(rename = "out")]
    pub app_node: AppNode,
    pub app_name: String,
    pub mapped_ports: Vec<(u64, u64)>,
    pub host_ipv4: String,
    pub vcpus: u64,
    pub memory_mb: u64,
    pub disk_size_gb: u64,
    pub created_at: Datetime,
    pub price_per_unit: u64,
    pub locked_nano: u64,
    pub collected_at: Datetime,
    pub mr_enclave: String,
    pub package_url: String,
    pub hratls_pubkey: String,
}

impl From<ActiveAppWithNode> for ActiveApp {
    fn from(val: ActiveAppWithNode) -> Self {
        Self {
            id: val.id,
            admin: val.admin,
            app_node: val.app_node.id,
            app_name: val.app_name,
            mapped_ports: val.mapped_ports,
            host_ipv4: val.host_ipv4,
            vcpus: val.vcpus,
            memory_mb: val.memory_mb,
            disk_size_gb: val.disk_size_gb,
            created_at: val.created_at,
            price_per_unit: val.price_per_unit,
            locked_nano: val.locked_nano,
            collected_at: val.collected_at,
            mr_enclave: val.mr_enclave,
            package_url: val.package_url,
            hratls_pubkey: val.hratls_pubkey,
        }
    }
}

impl ActiveAppWithNode {
    pub async fn get_by_uuid(db: &Surreal<Client>, uuid: &str) -> Result<Option<Self>, Error> {
        let contract: Option<Self> =
            db.query(format!("select * from {ACTIVE_APP}:{uuid} fetch out;")).await?.take(0)?;
        Ok(contract)
    }

    pub async fn list_by_node(db: &Surreal<Client>, node_pubkey: &str) -> Result<Vec<Self>, Error> {
        let mut query_result = db
            .query(format!(
                "select * from {ACTIVE_APP} where out = {APP_NODE}:{node_pubkey} fetch out;"
            ))
            .await?;

        let contract: Vec<Self> = query_result.take(0)?;
        Ok(contract)
    }

    pub async fn list_by_admin(db: &Surreal<Client>, admin: &str) -> Result<Vec<Self>, Error> {
        let mut query_result = db
            .query(format!("select * from {ACTIVE_APP} where in = {ACCOUNT}:{admin} fetch out;"))
            .await?;

        let app_contracts: Vec<Self> = query_result.take(0)?;

        Ok(app_contracts)
    }

    pub async fn list_by_operator(
        db: &Surreal<Client>,
        operator: &str,
    ) -> Result<Vec<Self>, Error> {
        let mut query_result = db
            .query(format!(
                "select
                    (select * from ->operator->app_node<-{ACTIVE_APP} fetch out)
                    as app_contracts
                from {ACCOUNT}:{operator}"
            ))
            .await?;
        #[derive(Deserialize)]
        struct Wrapper {
            app_contracts: Vec<ActiveAppWithNode>,
        }

        let c: Option<Wrapper> = query_result.take(0)?;
        match c {
            Some(contracts_wrapper) => Ok(contracts_wrapper.app_contracts),
            None => Ok(vec![]),
        }
    }
}

#[derive(Debug, Serialize)]
pub struct AppNodeResources {
    pub avail_no_of_port: u32,
    pub avail_vcpus: u32,
    pub avail_memory_mb: u32,
    pub avail_storage_mb: u32,
    pub max_ports_per_app: u32,
}

impl AppNodeResources {
    pub async fn merge(
        self,
        db: &Surreal<Client>,
        node_pubkey: &str,
    ) -> Result<Option<AppNode>, Error> {
        let app_node: Option<AppNode> = db.update((APP_NODE, node_pubkey)).merge(self).await?;
        Ok(app_node)
    }
}

impl From<&old_brain::BrainData> for Vec<AppNode> {
    fn from(old_data: &old_brain::BrainData) -> Self {
        let mut nodes = Vec::new();
        for old_node in old_data.app_nodes.iter() {
            nodes.push(AppNode {
                id: RecordId::from(("app_node", old_node.node_pubkey.clone())),
                operator: RecordId::from((ACCOUNT, old_node.operator_wallet.clone())),
                country: old_node.country.clone(),
                region: old_node.region.clone(),
                city: old_node.city.clone(),
                ip: old_node.ip.clone(),
                avail_mem_mb: old_node.avail_mem_mb,
                avail_vcpus: old_node.avail_vcpus,
                avail_storage_gbs: old_node.avail_storage_mb,
                avail_ports: old_node.avail_no_of_port,
                max_ports_per_app: old_node.max_ports_per_app,
                price: old_node.price,
                offline_minutes: old_node.offline_minutes,
            });
        }
        nodes
    }
}

#[derive(Debug, Serialize, Deserialize)]
pub struct DeletedApp {
    pub id: RecordId,
    #[serde(rename = "in")]
    pub admin: RecordId,
    #[serde(rename = "out")]
    pub app_node: RecordId,
    pub app_name: String,
    pub mapped_ports: Vec<(u64, u64)>,
    pub host_ipv4: String,
    pub vcpus: u64,
    pub memory_mb: u64,
    pub disk_size_gb: u64,
    pub created_at: Datetime,
    pub price_per_unit: u64,
    pub locked_nano: u64,
    pub collected_at: Datetime,
    pub mr_enclave: String,
    pub package_url: String,
    pub hratls_pubkey: String,
}