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// Copyright 2018 TiKV Project Authors. Licensed under Apache-2.0.

use std::error::Error;
use std::result::Result;
use tikv_util::config::ReadableDuration;

#[derive(Clone, Serialize, Deserialize, PartialEq, Debug)]
#[serde(default)]
#[serde(rename_all = "kebab-case")]
pub struct Config {
    pub num_threads: usize,
    pub stream_channel_window: usize,
    /// The timeout for going back into normal mode from import mode.
    ///
    /// Default is 10m.
    pub import_mode_timeout: ReadableDuration,
}

impl Default for Config {
    fn default() -> Config {
        Config {
            num_threads: 8,
            stream_channel_window: 128,
            import_mode_timeout: ReadableDuration::minutes(10),
        }
    }
}

impl Config {
    pub fn validate(&self) -> Result<(), Box<dyn Error>> {
        if self.num_threads == 0 {
            return Err("import.num_threads can not be 0".into());
        }
        if self.stream_channel_window == 0 {
            return Err("import.stream_channel_window can not be 0".into());
        }
        Ok(())
    }
}