ratchjob 0.2.1

use serde::{Deserialize, Serialize};
use std::borrow::Cow;
use std::fmt::{Display, Formatter};
use std::{collections::HashMap, convert::TryFrom, sync::Arc};

use crate::common::model::{TokenSession, UserSession};
use crate::common::pb::data_object::CacheItemDo;

#[derive(Debug, Eq, PartialEq, Clone, Hash, Serialize, Deserialize)]
pub enum CacheType {
    String,
    Map,
    UserSession,
    ApiTokenSession, //open api
}

impl Default for CacheType {
    fn default() -> Self {
        Self::String
    }
}

impl CacheType {
    pub fn get_type_data(&self) -> u8 {
        match self {
            CacheType::String => 1,
            CacheType::Map => 2,
            CacheType::UserSession => 3,
            CacheType::ApiTokenSession => 4,
        }
    }

    pub fn from_data(v: u8) -> anyhow::Result<Self> {
        match v {
            1 => Ok(CacheType::String),
            2 => Ok(CacheType::Map),
            3 => Ok(CacheType::UserSession),
            4 => Ok(CacheType::ApiTokenSession),
            _ => Err(anyhow::anyhow!("unknown type from {}", &v)),
        }
    }
}

#[derive(Debug, Eq, PartialEq, Clone, Hash, Default, Serialize, Deserialize)]
pub struct CacheKey {
    pub cache_type: CacheType,
    pub key: Arc<String>,
}

impl CacheKey {
    pub fn to_key_string(&self) -> String {
        format!("{}\x00{}", self.cache_type.get_type_data(), &self.key)
    }
}

impl Display for CacheKey {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}\x00{}", self.cache_type.get_type_data(), &self.key)
    }
}

impl CacheKey {
    pub fn new(cache_type: CacheType, key: Arc<String>) -> Self {
        Self { cache_type, key }
    }

    pub fn from_db_key(db_key: Vec<u8>) -> anyhow::Result<Self> {
        let mut iter = db_key.split(|v| *v == 0);
        let t = if let Some(t) = iter.next() {
            std::str::from_utf8(t)?.parse::<u8>()?
        } else {
            return Err(anyhow::anyhow!("db_key split type is error!"));
        };
        if let Some(key) = iter.next() {
            Self::from_bytes(key.to_owned(), t)
        } else {
            Err(anyhow::anyhow!("db_key split key is error!"))
        }
    }

    fn from_bytes(key: Vec<u8>, t: u8) -> anyhow::Result<Self> {
        let key = String::from_utf8(key)?;
        Self::from_string(key, t)
    }

    fn from_string(key: String, t: u8) -> anyhow::Result<Self> {
        let cache_type = CacheType::from_data(t)?;
        Ok(Self {
            cache_type,
            key: Arc::new(key),
        })
    }
}

#[derive(Clone, Debug, Serialize, Deserialize)]
pub enum CacheValue {
    String(Arc<String>),
    Number(i64),
    Map(Arc<HashMap<String, String>>),
    //后面UserSession换成定义好的对象
    UserSession(Arc<UserSession>),
    ApiTokenSession(Arc<TokenSession>),
}

impl Default for CacheValue {
    fn default() -> Self {
        Self::String(Default::default())
    }
}

impl CacheValue {
    pub fn try_to_number(&self) -> Option<i64> {
        match self {
            CacheValue::Number(v) => Some(*v),
            CacheValue::String(v) => v.parse::<i64>().ok(),
            _ => None,
        }
    }

    pub fn try_to_string(&self) -> Option<Arc<String>> {
        match self {
            CacheValue::String(v) => Some(v.clone()),
            CacheValue::Number(v) => Some(Arc::new(v.to_string())),
            _ => None,
        }
    }

    pub fn get_cache_type(&self) -> CacheType {
        match self {
            CacheValue::String(_) => CacheType::String,
            CacheValue::Number(_) => CacheType::String,
            CacheValue::Map(_) => CacheType::Map,
            CacheValue::UserSession(_) => CacheType::UserSession,
            CacheValue::ApiTokenSession(_) => CacheType::ApiTokenSession,
        }
    }

    pub fn to_bytes(&self) -> Vec<u8> {
        match self {
            CacheValue::String(v) => v.as_bytes().to_owned(),
            CacheValue::Number(v) => v.to_string().as_bytes().to_owned(),
            CacheValue::Map(m) => serde_json::to_vec(m).unwrap_or_default(),
            CacheValue::UserSession(v) => serde_json::to_vec(v).unwrap_or_default(),
            CacheValue::ApiTokenSession(v) => serde_json::to_vec(v).unwrap_or_default(),
        }
    }

    pub fn from_bytes(data: &[u8], cache_type: CacheType) -> anyhow::Result<Self> {
        match cache_type {
            CacheType::String => Ok(CacheValue::String(Arc::new(
                std::str::from_utf8(data)?.to_string(),
            ))),
            CacheType::Map => Ok(CacheValue::Map(Arc::new(serde_json::from_slice(&data)?))),
            CacheType::UserSession => Ok(CacheValue::UserSession(Arc::new(
                serde_json::from_slice(&data)?,
            ))),
            CacheType::ApiTokenSession => {
                Ok(CacheValue::ApiTokenSession(serde_json::from_slice(&data)?))
            }
        }
    }

    pub fn to_do<'b>(&self, key: &'b CacheKey) -> CacheItemDo<'b> {
        CacheItemDo {
            key: Cow::Borrowed(key.key.as_ref()),
            data: Cow::Owned(self.to_bytes()),
            timeout: 0,
            cache_type: self.get_cache_type().get_type_data() as u32,
        }
    }
}

impl<'a> TryFrom<CacheItemDo<'a>> for CacheValue {
    type Error = anyhow::Error;
    fn try_from(value: CacheItemDo<'a>) -> Result<Self, Self::Error> {
        let cache_type = CacheType::from_data(value.cache_type as u8)?;
        Self::from_bytes(value.data.as_ref(), cache_type)
    }
}