use crate::commands::WholeStreamCommand;
use crate::prelude::*;
use nu_errors::ShellError;
use nu_protocol::{ReturnSuccess, Signature, UntaggedValue};
use serde::Deserialize;
use serde::Serialize;
use sha2::{Digest, Sha256};
use std::io::Read;
use std::path::PathBuf;
pub struct Autoenv;

#[derive(Deserialize, Serialize, Debug, Default)]
pub struct Trusted {
    pub files: IndexMap<String, Vec<u8>>,
}
impl Trusted {
    pub fn new() -> Self {
        Trusted {
            files: IndexMap::new(),
        }
    }
}
pub fn file_is_trusted(nu_env_file: &PathBuf, content: &[u8]) -> Result<bool, ShellError> {
    let contentdigest = Sha256::digest(&content).as_slice().to_vec();
    let nufile = std::fs::canonicalize(nu_env_file)?;

    let trusted = read_trusted()?;
    Ok(trusted.files.get(&nufile.to_string_lossy().to_string()) == Some(&contentdigest))
}

pub fn read_trusted() -> Result<Trusted, ShellError> {
    let config_path = config::default_path_for(&Some(PathBuf::from("nu-env.toml")))?;

    let mut file = std::fs::OpenOptions::new()
        .read(true)
        .create(true)
        .write(true)
        .open(config_path)
        .or_else(|_| {
            Err(ShellError::untagged_runtime_error(
                "Couldn't open nu-env.toml",
            ))
        })?;
    let mut doc = String::new();
    file.read_to_string(&mut doc)?;

    let allowed = toml::de::from_str(doc.as_str()).unwrap_or_else(|_| Trusted::new());
    Ok(allowed)
}

#[async_trait]
impl WholeStreamCommand for Autoenv {
    fn name(&self) -> &str {
        "autoenv"
    }
    fn usage(&self) -> &str {
        // "Mark a .nu-env file in a directory as trusted. Needs to be re-run after each change to the file or its filepath."
        "Manage directory specific environments"
    }
    fn signature(&self) -> Signature {
        Signature::build("autoenv")
    }
    async fn run(
        &self,
        _args: CommandArgs,
        registry: &CommandRegistry,
    ) -> Result<OutputStream, ShellError> {
        let registry = registry.clone();
        Ok(OutputStream::one(ReturnSuccess::value(
            UntaggedValue::string(crate::commands::help::get_help(&Autoenv, &registry))
                .into_value(Tag::unknown()),
        )))
    }

    fn examples(&self) -> Vec<Example> {
        vec![Example {
            description: "Allow .nu-env file in current directory",
            example: "autoenv trust",
            result: None,
        }]
    }
}