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use std::sync::Arc;

use serde::{Deserialize, Serialize};
use uuid::Uuid;

use crate::schema::{AppMeta, WorkloadV2};

// TODO: Figure out token type.
pub type RawToken = String;

/// Id of the node - aka server.
pub type NodeId = Uuid;

/// Id of a single Webassembly instance.
#[derive(Serialize, Deserialize, Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct InstanceId(Uuid);

impl InstanceId {
    pub fn new_random() -> Self {
        Self(Uuid::new_v4())
    }

    pub fn nil() -> Self {
        Self(Uuid::nil())
    }

    pub fn to_uuid(&self) -> Uuid {
        self.0
    }

    pub fn from_uuid(uuid: Uuid) -> Self {
        Self(uuid)
    }
}

impl std::fmt::Display for InstanceId {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}

impl std::str::FromStr for InstanceId {
    type Err = uuid::Error;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        Ok(Self(Uuid::parse_str(s)?))
    }
}

impl From<uuid::Uuid> for InstanceId {
    fn from(uuid: uuid::Uuid) -> Self {
        Self(uuid)
    }
}

impl From<InstanceId> for uuid::Uuid {
    fn from(id: InstanceId) -> Self {
        id.0
    }
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct WorkloadMeta {
    pub workload: WorkloadV2,

    // TODO(theduke): store whole AppVersionV1 entity intstead.
    pub app_meta: Option<AppMeta>,
}

impl WorkloadMeta {
    pub fn agent(&self) -> Option<&str> {
        // TODO: implement agent passing/determination for metering.
        None
    }
}

/// Metadata for a running instance.
#[derive(Debug, Clone)]
pub struct InstanceMeta {
    /// Unique, randomly generated UUID for the instance.
    pub id: InstanceId,
    /// Workload related metadata.
    pub workload: Arc<WorkloadMeta>,
}

impl InstanceMeta {
    pub fn new(workload: Arc<WorkloadMeta>) -> Self {
        Self {
            id: InstanceId::new_random(),
            workload,
        }
    }
}