use std::{
    collections::{HashMap, VecDeque},
    num::ParseIntError,
    str::{FromStr, Utf8Error},
};

use crate::{
    element::{Content, Name, NamespaceDeclaration},
    Element,
};

#[derive(Debug)]
pub enum DeserializeError {
    FromStr(String),
    UnexpectedAttributes(HashMap<Name, String>),
    UnexpectedContent(VecDeque<Content>),
    MissingAttribute(Name),
    IncorrectName(String),
    IncorrectNamespace(String),
    Unqualified,
    MissingChild,
    MissingValue,
}

#[derive(Debug)]
pub enum Error {
    ReadError(std::io::Error),
    Utf8Error(Utf8Error),
    ParseError(String),
    EntityProcessError(String),
    // TODO: better choice for failures than string
    InvalidCharRef(String),
    DuplicateNameSpaceDeclaration(NamespaceDeclaration),
    DuplicateAttribute(String),
    UnqualifiedNamespace(String),
    MismatchedEndTag(Name, Name),
    NotInElement(String),
    ExtraData(String),
    UndeclaredNamespace(String),
    IncorrectName(Name),
    UnexpectedAttribute(Name),
    DeserializeError(String),
    UnexpectedNumberOfContents(usize),
    UnexpectedContent(Content),
    UnexpectedElement(Name),
    Deserialize(DeserializeError),
}

impl From<DeserializeError> for Error {
    fn from(e: DeserializeError) -> Self {
        Self::Deserialize(e)
    }
}

impl From<std::io::Error> for Error {
    fn from(e: std::io::Error) -> Self {
        Self::ReadError(e)
    }
}

impl From<Utf8Error> for Error {
    fn from(e: Utf8Error) -> Self {
        Self::Utf8Error(e)
    }
}

impl From<ParseIntError> for Error {
    fn from(e: ParseIntError) -> Self {
        Self::InvalidCharRef(e.to_string())
    }
}