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use crate::header::Header;
use crate::symbol::{SYMBOL};

#[cfg(test)]
mod tests;

pub struct ContentDisposition {
    pub disposition_type: String,
    pub field_name: Option<String>,
    pub file_name: Option<String>
}

pub struct DispositionType {
    pub inline: &'static str,
    pub attachment: &'static str,
    pub form_data: &'static str
}

impl ContentDisposition {
    pub fn as_string(&self) -> Result<String, String> {
        let mut formatted = "".to_string();
        let is_inline = self.disposition_type.to_string() == DISPOSITION_TYPE.inline.to_string();
        if is_inline {
            let is_file_name_specified = self.file_name.is_some();
            if is_file_name_specified {
                let message = "For Content-Disposition of type inline 'filename' property is redundant";
                return Err(message.to_string());
            }
            let is_field_name_specified = self.field_name.is_some();
            if is_field_name_specified {
                let message = "For Content-Disposition of type inline 'name' property is redundant";
                return Err(message.to_string());
            }

            formatted = format!("{}: {}", Header::_CONTENT_DISPOSITION.to_string(), self.disposition_type);
        }

        let is_attachment = self.disposition_type.to_string() == DISPOSITION_TYPE.attachment.to_string();
        if is_attachment {
            let is_field_name_specified = self.field_name.is_some();
            if is_field_name_specified {
                let message = "For Content-Disposition of type attachment 'name' property is redundant";
                return Err(message.to_string());
            }


            let is_file_name_specified = self.file_name.is_some();
            if is_file_name_specified {
                let file_name = self.file_name.clone().unwrap();
                formatted = format!("{}: {}; filename=\"{}\"", Header::_CONTENT_DISPOSITION.to_string(), self.disposition_type, file_name);
            } else {
                formatted = format!("{}: {}", Header::_CONTENT_DISPOSITION.to_string(), self.disposition_type);
            }
        }

        let is_form_data = self.disposition_type.to_string() == DISPOSITION_TYPE.form_data.to_string();
        if is_form_data {
            let is_file_name_specified = self.file_name.is_some();
            let is_field_name_specified = self.field_name.is_some();

            if !is_field_name_specified {
                let message = "Content-Dispositon header with a type of multipart/form-data is required to have 'name' property";
                return Err(message.to_string())
            }

            if is_file_name_specified {
                let file_name = self.file_name.clone().unwrap();
                let field_name = self.field_name.clone().unwrap();

                formatted = format!("{}: {}; name=\"{}\"; filename=\"{}\"", Header::_CONTENT_DISPOSITION.to_string(), self.disposition_type, field_name, file_name);
            } else {
                let field_name = self.field_name.clone().unwrap();

                formatted = format!("{}: {}; name=\"{}\"", Header::_CONTENT_DISPOSITION.to_string(), self.disposition_type, field_name);
            }
        }


        Ok(formatted)
    }
}

pub const DISPOSITION_TYPE: DispositionType = DispositionType {
    inline: "inline",
    attachment: "attachment",
    form_data: "form-data",
};


impl ContentDisposition {
    pub fn parse(raw_content_disposition: &str) -> Result<ContentDisposition, String> {
        let mut parts: Vec<&str> = raw_content_disposition.split(SYMBOL.semicolon).collect();
        if parts.len() == 0 {
            parts.push(raw_content_disposition);
        }

        let disposition_type = parts.get(0).unwrap();
        if disposition_type.to_string() != DISPOSITION_TYPE.inline.to_string()
            && disposition_type.to_string() != DISPOSITION_TYPE.attachment.to_string()
            && disposition_type.to_string() != DISPOSITION_TYPE.form_data.to_string() {
            let message = format!("Unable to parse Content-Disposition header: {}", raw_content_disposition);
            return Err(message)
        }

        let mut filename = None;
        let mut fieldname = None;

        let boxed_second_element = parts.get(1);
        if boxed_second_element.is_some() {
            let second_element = boxed_second_element.unwrap();
            let boxed_split = second_element.split_once(SYMBOL.equals);
            if boxed_split.is_none() {
                let message = format!("Unable to parse second property in the Content-Disposition header: {}", second_element);
                return Err(message)
            }
            let (key, value) = boxed_split.unwrap();
            let key = key.trim();
            let is_filename_field = key == "filename";
            if is_filename_field {
                filename = Some(value.to_string().replace(SYMBOL.quotation_mark, SYMBOL.empty_string));
            }
            let is_name_field = key == "name";
            if is_name_field  {
                fieldname = Some(value.to_string().replace(SYMBOL.quotation_mark, SYMBOL.empty_string));
            }
        }

        let boxed_third_element = parts.get(2);
        if boxed_third_element.is_some() {
            let second_element = boxed_third_element.unwrap();
            let boxed_split = second_element.split_once(SYMBOL.equals);
            if boxed_split.is_none() {
                let message = format!("Unable to parse second property in the Content-Disposition header: {}", second_element);
                return Err(message)
            }
            let (key, value) = boxed_split.unwrap();
            let key = key.trim();
            let is_filename_field = key == "filename";
            if is_filename_field {
                filename = Some(value.to_string().replace(SYMBOL.quotation_mark, SYMBOL.empty_string));
            }
            let is_name_field = key == "name";
            if is_name_field  {
                fieldname = Some(value.to_string().replace(SYMBOL.quotation_mark, SYMBOL.empty_string));
            }

            if !is_filename_field && !is_name_field {
                let message = format!("Unable to parse property in the Content-Disposition header: {}", raw_content_disposition);
                return Err(message.to_string())
            }
        }

        let content_disposition = ContentDisposition {
            disposition_type: disposition_type.to_string(),
            field_name: fieldname,
            file_name: filename,
        };

        if disposition_type.to_string() == DISPOSITION_TYPE.form_data.to_string()
            && content_disposition.field_name == None {
            let message = format!("Field name is not set for Content-Disposition: {}", raw_content_disposition);
            return Err(message)
        }

        Ok(content_disposition)
    }
}