use crate::errors::ShellError;
use crate::object::{Primitive, Value};
use crate::parser::lexer::Spanned;
use crate::prelude::*;
use std::path::{Path, PathBuf};

pub fn open(args: CommandArgs) -> Result<OutputStream, ShellError> {
    if args.positional.len() == 0 {
        return Err(ShellError::string("open requires a filepath"));
    }

    let cwd = args.env.lock().unwrap().cwd().to_path_buf();
    let mut full_path = PathBuf::from(cwd);

    let contents = match &args.positional[0].item {
        Value::Primitive(Primitive::String(s)) => {
            full_path.push(Path::new(&s));
            match std::fs::read_to_string(&full_path) {
                Ok(s) => s,
                Err(_) => {
                    return Err(ShellError::labeled_error(
                        "File cound not be opened",
                        "file not found",
                        args.positional[0].span,
                    ));
                }
            }
        }
        _ => {
            return Err(ShellError::labeled_error(
                "Expected string value for filename",
                "expected filename",
                args.positional[0].span,
            ));
        }
    };

    let mut stream = VecDeque::new();

    let open_raw = match args.positional.get(1) {
        Some(Spanned {
            item: Value::Primitive(Primitive::String(s)),
            ..
        }) if s == "--raw" => true,
        Some(v) => {
            return Err(ShellError::labeled_error(
                "Unknown flag for open",
                "unknown flag",
                v.span,
            ))
        }
        _ => false,
    };

    match full_path.extension() {
        Some(x) if x == "toml" && !open_raw => {
            stream.push_back(ReturnValue::Value(
                crate::commands::from_toml::from_toml_string_to_value(contents),
            ));
        }
        Some(x) if x == "json" && !open_raw => {
            stream.push_back(ReturnValue::Value(
                crate::commands::from_json::from_json_string_to_value(contents),
            ));
        }
        Some(x) if x == "yml" && !open_raw => {
            stream.push_back(ReturnValue::Value(
                crate::commands::from_yaml::from_yaml_string_to_value(contents),
            ));
        }
        Some(x) if x == "yaml" && !open_raw => {
            stream.push_back(ReturnValue::Value(
                crate::commands::from_yaml::from_yaml_string_to_value(contents),
            ));
        }
        _ => {
            stream.push_back(ReturnValue::Value(Value::Primitive(Primitive::String(
                contents,
            ))));
        }
    }

    Ok(stream.boxed())
}