use super::JobType;
#[cfg(feature = "server")]
use crate::models::schema::*;
use crate::utils::Platform;
use crate::{UError, UResult};
#[cfg(feature = "server")]
use diesel::{Identifiable, Insertable, Queryable};
use serde::{Deserialize, Serialize};
use std::fs;
use uuid::Uuid;

#[derive(Serialize, Deserialize, Clone, Debug)]
#[cfg_attr(
    feature = "server",
    derive(Queryable, Identifiable, Insertable, AsChangeset),
    table_name = "jobs"
)]
pub struct JobMeta {
    #[serde(default)]
    pub alias: Option<String>,

    /// string like `bash -c {} -a 1 --arg2`,
    /// where {} is replaced by executable's tmp path
    #[serde(default)]
    pub argv: String,

    #[serde(default = "Uuid::new_v4")]
    pub id: Uuid,

    #[serde(default)]
    pub exec_type: JobType,

    ///target triple
    #[serde(default)]
    pub platform: String,

    #[serde(default)]
    pub payload: Option<Vec<u8>>,

    /// if payload should be read from external resource
    #[serde(default)]
    pub payload_path: Option<String>,

    ///cron-like string
    #[serde(default)]
    pub schedule: Option<String>,
}

impl JobMeta {
    pub fn builder() -> JobMetaBuilder {
        JobMetaBuilder::default()
    }

    pub fn into_builder(self) -> JobMetaBuilder {
        JobMetaBuilder { inner: self }
    }

    pub fn from_shell(cmd: impl Into<String>) -> UResult<JobMeta> {
        Self::builder().with_shell(cmd).build()
    }
}

impl Default for JobMeta {
    fn default() -> Self {
        Self {
            id: Uuid::new_v4(),
            alias: None,
            argv: String::new(),
            exec_type: JobType::Shell,
            platform: Platform::current().into_string(),
            payload: None,
            schedule: None,
            payload_path: None,
        }
    }
}

#[derive(Default)]
pub struct JobMetaBuilder {
    inner: JobMeta,
}

impl JobMetaBuilder {
    pub fn with_shell(mut self, shell_cmd: impl Into<String>) -> Self {
        self.inner.argv = shell_cmd.into();
        self.inner.exec_type = JobType::Shell;
        self
    }

    pub fn with_payload(mut self, payload: impl Into<Vec<u8>>) -> Self {
        self.inner.payload = Some(payload.into());
        self
    }

    pub fn with_payload_src(mut self, path: impl Into<String>) -> Self {
        self.inner.payload_path = Some(path.into());
        self
    }

    pub fn with_alias(mut self, alias: impl Into<String>) -> Self {
        self.inner.alias = Some(alias.into());
        self
    }

    pub fn with_type(mut self, e_type: JobType) -> Self {
        self.inner.exec_type = e_type;
        self
    }

    pub fn build(self) -> UResult<JobMeta> {
        let mut inner = self.inner;
        match inner.exec_type {
            JobType::Shell => {
                if inner.argv.is_empty() {
                    // TODO: fix detecting
                    inner.argv = String::from("/bin/bash -c {}")
                }
                let argv_parts =
                    shlex::split(&inner.argv).ok_or(UError::JobArgsError("Shlex failed".into()))?;
                let empty_err = UError::JobArgsError("Empty argv".into());
                if argv_parts.get(0).ok_or(empty_err.clone())?.is_empty() {
                    return Err(empty_err.into());
                }
                if let Some(path) = &inner.payload_path {
                    let data = fs::read(path)
                        .map_err(|e| UError::FSError(path.to_string(), e.to_string()))?;
                    inner.payload = Some(data)
                }
                match inner.payload.as_ref() {
                    Some(_) => {
                        if !inner.argv.contains("{}") {
                            return Err(UError::JobArgsError(
                                "Argv contains no executable placeholder".into(),
                            )
                            .into());
                        }
                    }
                    None => {
                        if inner.argv.contains("{}") {
                            return Err(UError::JobArgsError(
                                "No payload provided, but argv contains executable placeholder"
                                    .into(),
                            )
                            .into());
                        }
                    }
                };
                if !Platform::new(&inner.platform).check() {
                    return Err(UError::JobArgsError(format!(
                        "Unknown platform {}",
                        inner.platform
                    )));
                }
                Ok(inner.into())
            }
            _ => Ok(inner.into()),
        }
    }
}