use std::str::from_utf8;

use macroconf::config;
use miniconf::{Error::Absent, JsonCoreSlash, Tree, TreeKey};
use serde::{Deserialize, Serialize};

#[config]
#[derive(Debug, Clone, Copy, Serialize, Deserialize, Tree)]
struct SubConfig {
    skipped: i32,
    #[min]
    min: i32,
    #[max]
    max: i32,
    #[default = 0]
    default: i32,
    /// This is a description
    description: i32,
}

#[config]
#[derive(Debug, Clone, Copy, Tree)]
struct Config {
    #[tree(depth(2))]
    sub_config: SubConfig,
}

#[test]
fn keys() {
    for (id, field) in ["skipped", "min", "max", "default", "description"]
        .into_iter()
        .enumerate()
    {
        assert_eq!(
            SubConfig::traverse_by_key(std::iter::once(field), |index, name| {
                assert_eq!((id, field), (index, name));
                Ok::<_, ()>(())
            }),
            Ok(1)
        );
    }
}

#[test]
fn sub_keys() {
    assert_eq!(
        SubConfig::traverse_by_key(["skipped", "value"].into_iter(), |_, _| Ok::<_, ()>(())),
        Ok(1)
    );
    for field in ["min", "max", "default", "description"] {
        assert_eq!(
            SubConfig::traverse_by_key([field, "value"].into_iter(), |_, _| Ok::<_, ()>(())),
            Ok(2)
        );
        assert_eq!(
            SubConfig::traverse_by_key([field, field].into_iter(), |_, _| Ok::<_, ()>(())),
            Ok(2)
        );
    }
}

#[test]
fn serialize() {
    let mut buffer = [0u8; 32];
    let config = SubConfig {
        skipped: 1,
        min: __SubConfigMin::new(2),
        max: __SubConfigMax::new(3),
        default: __SubConfigDefault::new(4),
        description: __SubConfigDescription::new(5),
    };

    for (input, output) in [
        ("/skipped", "1"),
        ("/min", "2"),
        ("/min/value", "2"),
        ("/min/min", "-2147483648"),
        ("/max", "3"),
        ("/max/value", "3"),
        ("/max/max", "2147483647"),
        ("/default", "4"),
        ("/default/value", "4"),
        ("/default/default", "0"),
        ("/description", "5"),
        ("/description/value", "5"),
        ("/description/description", "\"This is a description\""),
    ] {
        let res = config.get_json(input, &mut buffer);
        assert_eq!(res, Ok(output.len()));
        assert_eq!(from_utf8(&buffer[..output.len()]), Ok(output));
    }
}

#[test]
fn deserialize() {
    let mut config = SubConfig {
        skipped: 0,
        min: __SubConfigMin::new(0),
        max: __SubConfigMax::new(0),
        default: __SubConfigDefault::new(0),
        description: __SubConfigDescription::new(0),
    };

    for input in [
        "/skipped",
        "/min",
        "/min/value",
        "/max",
        "/max/value",
        "/default",
        "/default/value",
        "/description",
        "/description/value",
    ] {
        let res = config.set_json(input, b"10");
        assert_eq!(res, Ok(2));
    }

    for input in [
        "/min/min",
        "/max/max",
        "/default/default",
        "/description/description",
    ] {
        let res = config.set_json(input, b"10");
        assert_eq!(res, Err(Absent(1)));
    }
}

#[test]
fn subconfig() {
    let control = vec![
        "/sub_config/skipped".to_owned(),
        "/sub_config/min/value".to_owned(),
        "/sub_config/min/min".to_owned(),
        "/sub_config/max/value".to_owned(),
        "/sub_config/max/max".to_owned(),
        "/sub_config/default/value".to_owned(),
        "/sub_config/default/default".to_owned(),
        "/sub_config/description/value".to_owned(),
        "/sub_config/description/description".to_owned(),
    ];
    let paths: Vec<String> = Config::iter_paths::<String>("/")
        .filter_map(|path| path.ok())
        .collect();
    assert_eq!(paths, control);
}