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use std::collections::HashMap;
use std::error::Error;

use errors::Result;
use types::{DataObjectId, DataType, Resources, TaskId, UserAttrs};

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default)]
#[serde(deny_unknown_fields)]
pub struct TaskSpecInput {
    pub id: DataObjectId,

    #[serde(skip_serializing_if = "String::is_empty")]
    #[serde(default)]
    pub label: String,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default)]
#[serde(deny_unknown_fields)]
pub struct TaskSpec {
    pub id: TaskId,

    #[serde(skip_serializing_if = "Vec::is_empty")]
    #[serde(default)]
    pub inputs: Vec<TaskSpecInput>,

    #[serde(skip_serializing_if = "Vec::is_empty")]
    #[serde(default)]
    pub outputs: Vec<DataObjectId>,

    pub task_type: String,

    #[serde(skip_serializing_if = "Option::is_none")]
    #[serde(default)]
    pub config: Option<::serde_json::Value>,

    #[serde(default)]
    pub resources: Resources,

    #[serde(skip_serializing_if = "String::is_empty")]
    #[serde(default)]
    pub name: String,

    #[serde(skip_serializing_if = "HashMap::is_empty")]
    #[serde(default)]
    pub user: UserAttrs,
}

impl TaskSpec {
    pub fn parse_config<'a, D>(&'a self) -> Result<D>
    where
        for<'de> D: ::serde::de::Deserialize<'de>,
    {
        match self.config {
            Some(ref c) => ::serde_json::from_value(c.clone())
                .map_err(|e| format!("Cannot parse task config: {}", e.description()).into()),
            None => Err("Task config is empty, but non-empty config is expected".into()),
        }
    }
}

#[derive(Debug, Clone, Serialize, Deserialize, Default, PartialEq)]
#[serde(deny_unknown_fields)]
pub struct ObjectSpec {
    pub id: DataObjectId,

    #[serde(skip_serializing_if = "String::is_empty")]
    #[serde(default)]
    pub label: String,

    #[serde(skip_serializing_if = "String::is_empty")]
    #[serde(default)]
    pub content_type: String,

    pub data_type: DataType,

    #[serde(skip_serializing_if = "HashMap::is_empty")]
    #[serde(default)]
    pub user: UserAttrs,
}


#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct SessionSpec {
    pub name: String,

    #[serde(skip_serializing_if = "HashMap::is_empty")]
    #[serde(default)]
    pub user: UserAttrs,
}