use crate::errors::ShellError;
use crate::object::{Primitive, Switch, Value};
use crate::parser::parse::span::Span;
use crate::prelude::*;
use mime::Mime;
use std::path::{Path, PathBuf};
use std::str::FromStr;

command! {
    Open as open(args, path: Spanned<PathBuf>, --raw: Switch,) {
        let span = args.name_span;

        let cwd = args
            .env
            .lock()
            .unwrap()
            .path()
            .to_path_buf();

        let full_path = PathBuf::from(cwd);

        let path_str = path.to_str().ok_or(ShellError::type_error("Path", "invalid path".spanned(path.span)))?;

        let (file_extension, contents, contents_span) = fetch(&full_path, path_str, path.span)?;
        // let (file_extension, contents, contents_span) = match &args.expect_nth(0)?.item {
        //     Value::Primitive(Primitive::String(s)) => fetch(&full_path, s, args.expect_nth(0)?.span)?,
        //     _ => {
        //         return Err(ShellError::labeled_error(
        //             "Expected string value for filename",
        //             "expected filename",
        //             args.expect_nth(0)?.span,
        //         ));
        //     }
        // };

        let mut stream = VecDeque::new();

        let file_extension = if raw.is_present() {
            None
        } else {
            file_extension
        };

        match contents {
            Value::Primitive(Primitive::String(string)) =>
                stream.push_back(ReturnSuccess::value(parse_as_value(
                    file_extension,
                    string,
                    contents_span,
                    span,
                )?)
            ),

            other => stream.push_back(ReturnSuccess::value(other.spanned(span))),
        };

        stream
    }
}

pub fn fetch(
    cwd: &PathBuf,
    location: &str,
    span: Span,
) -> Result<(Option<String>, Value, Span), ShellError> {
    let mut cwd = cwd.clone();
    if location.starts_with("http:") || location.starts_with("https:") {
        let response = reqwest::get(location);
        match response {
            Ok(mut r) => match r.headers().get("content-type") {
                Some(content_type) => {
                    let content_type = Mime::from_str(content_type.to_str().unwrap()).unwrap();
                    match (content_type.type_(), content_type.subtype()) {
                        (mime::APPLICATION, mime::XML) => Ok((
                            Some("xml".to_string()),
                            Value::string(r.text().unwrap()),
                            span,
                        )),
                        (mime::APPLICATION, mime::JSON) => Ok((
                            Some("json".to_string()),
                            Value::string(r.text().unwrap()),
                            span,
                        )),
                        (mime::IMAGE, image_ty) => {
                            let mut buf: Vec<u8> = vec![];
                            r.copy_to(&mut buf).map_err(|_| {
                                ShellError::labeled_error(
                                    "Could not load image file",
                                    "could not load",
                                    span,
                                )
                            })?;
                            Ok((Some(image_ty.to_string()), Value::Binary(buf), span))
                        }
                        (mime::TEXT, mime::PLAIN) => {
                            let path_extension = r
                                .url()
                                .path_segments()
                                .and_then(|segments| segments.last())
                                .and_then(|name| if name.is_empty() { None } else { Some(name) })
                                .and_then(|name| {
                                    PathBuf::from(name)
                                        .extension()
                                        .map(|name| name.to_string_lossy().to_string())
                                });

                            Ok((path_extension, Value::string(r.text().unwrap()), span))
                        }
                        (ty, sub_ty) => Ok((
                            None,
                            Value::string(format!("Not yet support MIME type: {} {}", ty, sub_ty)),
                            span,
                        )),
                    }
                }
                None => Ok((None, Value::string(format!("No content type found")), span)),
            },
            Err(_) => {
                return Err(ShellError::labeled_error(
                    "URL could not be opened",
                    "url not found",
                    span,
                ));
            }
        }
    } else {
        cwd.push(Path::new(location));
        match std::fs::read(&cwd) {
            Ok(bytes) => match std::str::from_utf8(&bytes) {
                Ok(s) => Ok((
                    cwd.extension()
                        .map(|name| name.to_string_lossy().to_string()),
                    Value::string(s),
                    span,
                )),
                Err(_) => Ok((None, Value::Binary(bytes), span)),
            },
            Err(_) => {
                return Err(ShellError::labeled_error(
                    "File cound not be opened",
                    "file not found",
                    span,
                ));
            }
        }
    }
}

pub fn parse_as_value(
    extension: Option<String>,
    contents: String,
    contents_span: Span,
    name_span: Option<Span>,
) -> Result<Spanned<Value>, ShellError> {
    match extension {
        Some(x) if x == "toml" => {
            crate::commands::from_toml::from_toml_string_to_value(contents, contents_span)
                .map(|c| c.spanned(contents_span))
                .map_err(move |_| {
                    ShellError::maybe_labeled_error(
                        "Could not open as TOML",
                        "could not open as TOML",
                        name_span,
                    )
                })
        }
        Some(x) if x == "json" => {
            crate::commands::from_json::from_json_string_to_value(contents, contents_span)
                .map(|c| c.spanned(contents_span))
                .map_err(move |_| {
                    ShellError::maybe_labeled_error(
                        "Could not open as JSON",
                        "could not open as JSON",
                        name_span,
                    )
                })
        }
        Some(x) if x == "ini" => {
            crate::commands::from_ini::from_ini_string_to_value(contents, contents_span)
                .map(|c| c.spanned(contents_span))
                .map_err(move |_| {
                    ShellError::maybe_labeled_error(
                        "Could not open as INI",
                        "could not open as INI",
                        name_span,
                    )
                })
        }
        Some(x) if x == "xml" => {
            crate::commands::from_xml::from_xml_string_to_value(contents, contents_span).map_err(
                move |_| {
                    ShellError::maybe_labeled_error(
                        "Could not open as XML",
                        "could not open as XML",
                        name_span,
                    )
                },
            )
        }
        Some(x) if x == "yml" => {
            crate::commands::from_yaml::from_yaml_string_to_value(contents, contents_span).map_err(
                move |_| {
                    ShellError::maybe_labeled_error(
                        "Could not open as YAML",
                        "could not open as YAML",
                        name_span,
                    )
                },
            )
        }
        Some(x) if x == "yaml" => {
            crate::commands::from_yaml::from_yaml_string_to_value(contents, contents_span).map_err(
                move |_| {
                    ShellError::maybe_labeled_error(
                        "Could not open as YAML",
                        "could not open as YAML",
                        name_span,
                    )
                },
            )
        }
        _ => Ok(Value::string(contents).spanned(contents_span)),
    }
}