use indexmap::IndexMap;
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{Example, IntoPipelineData, PipelineData, ShellError, Signature, Value};

pub mod shadow {
    include!(concat!(env!("OUT_DIR"), "/shadow.rs"));
}

#[derive(Clone)]
pub struct Version;

impl Command for Version {
    fn name(&self) -> &str {
        "version"
    }

    fn signature(&self) -> Signature {
        Signature::build("version")
    }

    fn usage(&self) -> &str {
        "Display Nu version."
    }

    fn run(
        &self,
        engine_state: &EngineState,
        stack: &mut Stack,
        call: &Call,
        input: PipelineData,
    ) -> Result<PipelineData, ShellError> {
        version(engine_state, stack, call, input)
    }

    fn examples(&self) -> Vec<Example> {
        vec![Example {
            description: "Display Nu version",
            example: "version",
            result: None,
        }]
    }
}

pub fn version(
    engine_state: &EngineState,
    _stack: &mut Stack,
    call: &Call,
    _input: PipelineData,
) -> Result<PipelineData, ShellError> {
    let tag = call.head;

    let mut indexmap = IndexMap::with_capacity(4);

    indexmap.insert(
        "version".to_string(),
        Value::String {
            val: env!("CARGO_PKG_VERSION").to_string(),
            span: tag,
        },
    );

    let branch: Option<&str> = Some(shadow::BRANCH).filter(|x| !x.is_empty());
    if let Some(branch) = branch {
        indexmap.insert(
            "branch".to_string(),
            Value::String {
                val: branch.to_string(),
                span: call.head,
            },
        );
    }

    let short_commit: Option<&str> = Some(shadow::SHORT_COMMIT).filter(|x| !x.is_empty());
    if let Some(short_commit) = short_commit {
        indexmap.insert(
            "short_commit".to_string(),
            Value::String {
                val: short_commit.to_string(),
                span: call.head,
            },
        );
    }
    let commit_hash: Option<&str> = Some(shadow::COMMIT_HASH).filter(|x| !x.is_empty());
    if let Some(commit_hash) = commit_hash {
        indexmap.insert(
            "commit_hash".to_string(),
            Value::String {
                val: commit_hash.to_string(),
                span: call.head,
            },
        );
    }
    let commit_date: Option<&str> = Some(shadow::COMMIT_DATE).filter(|x| !x.is_empty());
    if let Some(commit_date) = commit_date {
        indexmap.insert(
            "commit_date".to_string(),
            Value::String {
                val: commit_date.to_string(),
                span: call.head,
            },
        );
    }

    let build_os: Option<&str> = Some(shadow::BUILD_OS).filter(|x| !x.is_empty());
    if let Some(build_os) = build_os {
        indexmap.insert(
            "build_os".to_string(),
            Value::String {
                val: build_os.to_string(),
                span: call.head,
            },
        );
    }

    let rust_version: Option<&str> = Some(shadow::RUST_VERSION).filter(|x| !x.is_empty());
    if let Some(rust_version) = rust_version {
        indexmap.insert(
            "rust_version".to_string(),
            Value::String {
                val: rust_version.to_string(),
                span: call.head,
            },
        );
    }

    let rust_channel: Option<&str> = Some(shadow::RUST_CHANNEL).filter(|x| !x.is_empty());
    if let Some(rust_channel) = rust_channel {
        indexmap.insert(
            "rust_channel".to_string(),
            Value::String {
                val: rust_channel.to_string(),
                span: call.head,
            },
        );
    }

    let cargo_version: Option<&str> = Some(shadow::CARGO_VERSION).filter(|x| !x.is_empty());
    if let Some(cargo_version) = cargo_version {
        indexmap.insert(
            "cargo_version".to_string(),
            Value::String {
                val: cargo_version.to_string(),
                span: call.head,
            },
        );
    }

    let pkg_version: Option<&str> = Some(shadow::PKG_VERSION).filter(|x| !x.is_empty());
    if let Some(pkg_version) = pkg_version {
        indexmap.insert(
            "pkg_version".to_string(),
            Value::String {
                val: pkg_version.to_string(),
                span: call.head,
            },
        );
    }

    let build_time: Option<&str> = Some(shadow::BUILD_TIME).filter(|x| !x.is_empty());
    if let Some(build_time) = build_time {
        indexmap.insert(
            "build_time".to_string(),
            Value::String {
                val: build_time.to_string(),
                span: call.head,
            },
        );
    }

    let build_rust_channel: Option<&str> =
        Some(shadow::BUILD_RUST_CHANNEL).filter(|x| !x.is_empty());
    if let Some(build_rust_channel) = build_rust_channel {
        indexmap.insert(
            "build_rust_channel".to_string(),
            Value::String {
                val: build_rust_channel.to_string(),
                span: call.head,
            },
        );
    }

    indexmap.insert(
        "features".to_string(),
        Value::String {
            val: features_enabled().join(", "),
            span: call.head,
        },
    );

    // Get a list of command names and check for plugins
    let installed_plugins = engine_state
        .plugin_decls()
        .into_iter()
        .filter(|x| x.is_plugin().is_some())
        .map(|x| x.name())
        .collect::<Vec<_>>();

    indexmap.insert(
        "installed_plugins".to_string(),
        Value::String {
            val: installed_plugins.join(", "),
            span: call.head,
        },
    );

    let cols = indexmap.keys().cloned().collect::<Vec<_>>();
    let vals = indexmap.values().cloned().collect::<Vec<_>>();

    // Ok(Value::List {
    //     vals: vec![Value::Record {
    //         cols,
    //         vals,
    //         span: call.head,
    //     }],
    //     span: call.head,
    // }
    // .into_pipeline_data())

    // List looks better than table, imo
    Ok(Value::Record {
        cols,
        vals,
        span: call.head,
    }
    .into_pipeline_data())
}

fn features_enabled() -> Vec<String> {
    let mut names = vec!["default".to_string()];

    // NOTE: There should be another way to know
    // features on.
    #[cfg(feature = "ctrlc")]
    {
        names.push("ctrlc".to_string());
    }

    // #[cfg(feature = "rich-benchmark")]
    // {
    //     names.push("rich-benchmark".to_string());
    // }

    #[cfg(feature = "rustyline-support")]
    {
        names.push("rustyline".to_string());
    }

    #[cfg(feature = "term")]
    {
        names.push("term".to_string());
    }

    #[cfg(feature = "uuid_crate")]
    {
        names.push("uuid".to_string());
    }

    #[cfg(feature = "which")]
    {
        names.push("which".to_string());
    }

    #[cfg(feature = "zip")]
    {
        names.push("zip".to_string());
    }

    #[cfg(feature = "clipboard-cli")]
    {
        names.push("clipboard-cli".to_string());
    }

    #[cfg(feature = "trash-support")]
    {
        names.push("trash".to_string());
    }

    #[cfg(feature = "dataframe")]
    {
        names.push("dataframe".to_string());
    }

    #[cfg(feature = "table-pager")]
    {
        names.push("table-pager".to_string());
    }

    // #[cfg(feature = "binaryview")]
    // {
    //     names.push("binaryview".to_string());
    // }

    // #[cfg(feature = "start")]
    // {
    //     names.push("start".to_string());
    // }

    // #[cfg(feature = "bson")]
    // {
    //     names.push("bson".to_string());
    // }

    // #[cfg(feature = "sqlite")]
    // {
    //     names.push("sqlite".to_string());
    // }

    // #[cfg(feature = "s3")]
    // {
    //     names.push("s3".to_string());
    // }

    // #[cfg(feature = "chart")]
    // {
    //     names.push("chart".to_string());
    // }

    // #[cfg(feature = "xpath")]
    // {
    //     names.push("xpath".to_string());
    // }

    // #[cfg(feature = "selector")]
    // {
    //     names.push("selector".to_string());
    // }

    // #[cfg(feature = "extra")]
    // {
    //     names.push("extra".to_string());
    // }

    // #[cfg(feature = "preserve_order")]
    // {
    //     names.push("preserve_order".to_string());
    // }

    // #[cfg(feature = "wee_alloc")]
    // {
    //     names.push("wee_alloc".to_string());
    // }

    // #[cfg(feature = "console_error_panic_hook")]
    // {
    //     names.push("console_error_panic_hook".to_string());
    // }

    names.sort();

    names
}