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/// # Config Reference
///
/// Config file reference for `a_cli_tool`.
///
/// By default `a_cli_tool` looks for configuration in `./config.yaml`,
/// unless another path is specified with the `-c/--config` parameter.
///
#[derive(serde::Deserialize, schemars::JsonSchema)]
pub struct Config {
    /// The name of the thing this CLI tool is building for you.
    ///
    name: String,

    /// The version of the thing this CLI tool will build for you.
    ///
    /// This is a [SemVer][semver] version, e.g:
    ///
    /// ```
    /// version: 1.2.3
    /// ```
    ///
    /// [semver]: https://semver.org/
    ///
    version: Version,

    /// _Optional:_ A description of the thing this CLI tool is
    /// building for you.
    ///
    description: Option<String>,

    #[serde(flatten)]
    data: AppData,
}

#[derive(serde::Deserialize)]
pub struct Version(semver::Version);

impl schemars::JsonSchema for Version {
    fn is_referenceable() -> bool {
        false
    }

    fn schema_name() -> String {
        "Version".to_string()
    }

    fn json_schema(_: &mut schemars::gen::SchemaGenerator) -> schemars::schema::Schema {
        schemars::schema::SchemaObject {
            instance_type: Some(schemars::schema::InstanceType::String.into()),
            ..Default::default()
        }
        .into()
    }
}

/// Application config fields.
///
/// Configuration for this CLI tool that tell it where to get data
/// from, write data to, and what operations to perform on it.
///
#[derive(serde::Deserialize, schemars::JsonSchema)]
pub struct AppData {
    /// The configuration for the source of data for this tool.
    ///
    source: Source,

    /// A path to write the created thing to.
    ///
    target: std::path::PathBuf,

    /// The operations to perform on the data this tool manipulates.
    ///
    /// This array of operations will be performed in order and an
    /// operation may appear more than once.
    ///
    /// E.g:
    ///
    /// ```
    /// actions: [ foo, bar, baz, bar ]
    /// ```
    ///
    actions: Vec<Actions>,
}

/// The configuration for the source of data for this tool.
///
/// This can either be set to a local file, or a URL.
///
#[derive(serde::Deserialize, schemars::JsonSchema)]
#[serde(rename_all = "snake_case")]
pub enum Source {
    /// Set source to a file path.
    ///
    /// ```
    /// file: path/to/file.yaml
    /// ```
    ///
    File(std::path::PathBuf),

    /// Set source to a URL.
    ///
    /// ```
    /// url: https://urlofsource.com/sourcedata/
    /// ```
    ///
    Url(String),
}

/// The possible operations to perform on the data this tool manipulates.
///
/// See each option below for what it does and how it's referenced in
/// config.
///
#[derive(serde::Deserialize, schemars::JsonSchema)]
#[serde(rename_all = "snake_case")]
pub enum Actions {
    /// Perform a "foo" operation on the data:
    ///
    /// ```
    /// foo
    /// ```
    Foo,

    /// Perform a "bar" operation on the data:
    ///
    /// ```
    /// bar
    /// ```
    Bar,

    /// Perform a "baz" operation on the data:
    ///
    /// ```
    /// baz
    /// ```
    Baz,

    /// Perform a "foo bar" operation on the data:
    ///
    /// ```
    /// foo_bar
    /// ```
    FooBar,

    /// Perform a "foo baz" operation on the data:
    ///
    /// ```
    /// foo_baz
    /// ```
    BarBaz,

    /// Perform a "foo bar baz" operation on the data:
    ///
    /// ```
    /// fbb
    /// ```
    #[serde(rename = "fbb")]
    FooBarBaz,
}