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use crate::prelude::*;
use nu_engine::{shell::MvArgs, WholeStreamCommand};
use nu_errors::ShellError;
use nu_protocol::{Signature, SyntaxShape};

pub struct Mv;

impl WholeStreamCommand for Mv {
    fn name(&self) -> &str {
        "mv"
    }

    fn signature(&self) -> Signature {
        Signature::build("mv")
            .required(
                "source",
                SyntaxShape::GlobPattern,
                "the location to move files/directories from",
            )
            .required(
                "destination",
                SyntaxShape::FilePath,
                "the location to move files/directories to",
            )
    }

    fn usage(&self) -> &str {
        "Move files or directories."
    }

    fn run_with_actions(&self, args: CommandArgs) -> Result<ActionStream, ShellError> {
        mv(args)
    }

    fn examples(&self) -> Vec<Example> {
        vec![
            Example {
                description: "Rename a file",
                example: "mv before.txt after.txt",
                result: None,
            },
            Example {
                description: "Move a file into a directory",
                example: "mv test.txt my/subdirectory",
                result: None,
            },
            Example {
                description: "Move many files into a directory",
                example: "mv *.txt my/subdirectory",
                result: None,
            },
        ]
    }
}

fn mv(args: CommandArgs) -> Result<ActionStream, ShellError> {
    let name = args.call_info.name_tag.clone();
    let shell_manager = args.shell_manager();

    let args = MvArgs {
        src: args.req(0)?,
        dst: args.req(1)?,
    };

    shell_manager.mv(args, name)
}

#[cfg(test)]
mod tests {
    use super::Mv;
    use super::ShellError;

    #[test]
    fn examples_work_as_expected() -> Result<(), ShellError> {
        use crate::examples::test as test_examples;

        test_examples(Mv {})
    }
}