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use std::env;
use std::fs::{File, metadata};
use crate::ext::file_ext::FileExt;
use crate::header::Header;
use crate::mime_type::MimeType;
use crate::range::{ContentRange, Range};
use crate::request::{METHOD, Request};
use crate::response::{Error, Response, STATUS_CODE_REASON_PHRASE};
use crate::symbol::SYMBOL;

pub struct StaticResourceController;

impl StaticResourceController {

    pub fn is_matching_request(request: &Request) -> bool {
        let boxed_static_filepath = FileExt::get_static_filepath(&request.request_uri);
        if boxed_static_filepath.is_err() {
            return false
        }

        let static_filepath = boxed_static_filepath.unwrap();

        let boxed_md = metadata(&static_filepath);
        if boxed_md.is_err() {
            return false
        }

        let md = boxed_md.unwrap();
        if md.is_dir() {
            return false
        }

        let boxed_file = File::open(&static_filepath);

        let is_get = request.method == METHOD.get;
        let is_head = request.method == METHOD.head;
        let is_options = request.method == METHOD.options;
        boxed_file.is_ok() && (is_get || is_head || is_options && request.request_uri != SYMBOL.slash)
    }

    pub fn process_request(request: &Request, mut response: Response) -> Response {
        let boxed_content_range_list = StaticResourceController::process_static_resources(&request);
        if boxed_content_range_list.is_ok() {
            let content_range_list = boxed_content_range_list.unwrap();

            if content_range_list.len() != 0 {

                let mut status_code_reason_phrase = STATUS_CODE_REASON_PHRASE.n200_ok;

                let does_request_include_range_header = request.get_header(Header::_RANGE.to_string()).is_some();
                if does_request_include_range_header {
                    status_code_reason_phrase = STATUS_CODE_REASON_PHRASE.n206_partial_content;
                }

                let is_options_request = request.method == METHOD.options;
                if is_options_request {
                    status_code_reason_phrase = STATUS_CODE_REASON_PHRASE.n204_no_content;
                }


                let dir = env::current_dir().unwrap();
                let working_directory = dir.as_path().to_str().unwrap();
                let static_filepath = [working_directory, request.request_uri.as_str()].join(SYMBOL.empty_string);
                let boxed_modified_date_time = FileExt::file_modified_utc(&static_filepath);

                if boxed_modified_date_time.is_ok() {
                    let modified_date_time = boxed_modified_date_time.unwrap();
                    let last_modified_unix_nanos = Header{ name: Header::_LAST_MODIFIED_UNIX_EPOCH_NANOS.to_string(), value: modified_date_time.to_string() };
                    response.headers.push(last_modified_unix_nanos);
                }

                response.status_code = *status_code_reason_phrase.status_code;
                response.reason_phrase = status_code_reason_phrase.reason_phrase.to_string();
                response.content_range_list = content_range_list;

            }
        } else {
            let error : Error = boxed_content_range_list.err().unwrap();
            let body = error.message;

            let content_range = Range::get_content_range(
                Vec::from(body.as_bytes()),
                MimeType::TEXT_HTML.to_string()
            );

            let content_range_list = vec![content_range];

            response.status_code = *error.status_code_reason_phrase.status_code;
            response.reason_phrase = error.status_code_reason_phrase.reason_phrase.to_string();
            response.content_range_list = content_range_list;

        }


        response
    }

    pub fn process_static_resources(request: &Request) -> Result<Vec<ContentRange>, Error> {
        let dir = env::current_dir().unwrap();
        let working_directory = dir.as_path().to_str().unwrap();
        let static_filepath = [working_directory, request.request_uri.as_str()].join(SYMBOL.empty_string);

        let mut content_range_list = Vec::new();

        let boxed_file = File::open(&static_filepath);
        if boxed_file.is_ok()  {
            let md = metadata(&static_filepath).unwrap();
            if md.is_file() {
                let mut range_header = &Header {
                    name: Header::_RANGE.to_string(),
                    value: "bytes=0-".to_string()
                };

                let boxed_header = request.get_header(Header::_RANGE.to_string());
                if boxed_header.is_some() {
                    range_header = boxed_header.unwrap();
                }

                let boxed_content_range_list = Range::get_content_range_list(&request.request_uri, range_header);
                if boxed_content_range_list.is_ok() {
                    content_range_list = boxed_content_range_list.unwrap();
                } else {
                    let error = boxed_content_range_list.err().unwrap();
                    return Err(error)
                }
            }
        }

        Ok(content_range_list)
    }
}