use std::{fs::File, io::{Write, Cursor}};
use quick_xml::{se::Serializer, events::BytesStart};
use serde::{Serialize, Deserialize};
use serde::ser::{SerializeSeq, SerializeStruct};

use serde_xml_rs::{to_string, to_writer};

#[derive(Debug, Deserialize, PartialEq, Clone)]
pub(crate) struct Metadata {
    pub(crate) title: String,
    pub(crate) series_title: String,

    pub(crate) chapter_number: u16,

    pub(crate) total_chapter_count: i16,

    pub(crate) volume_number: i16,

    pub(crate) summary: String,

    pub(crate) release_date: ReleaseDate,

    pub(crate) writer: String,
    pub(crate) translator: String,
    pub(crate) letterer: String,
    pub(crate) editor: String,

    pub(crate) publisher: String,

    pub(crate) genre: String,

    pub(crate) tags: Vec<String>,

    pub(crate) page_count: u16,

    pub(crate) language: String,

    pub(crate) characters: Vec<String>,

    pub(crate) age_rating: String
}

impl Default for Metadata {
    fn default() -> Self {
        Self {
            title: "".into(),
            series_title: "".into(),
            chapter_number: 0,
            total_chapter_count: -1,
            volume_number: 1,
            summary: "".into(),
            release_date: ReleaseDate {
                year: -1,
                month: -1,
                day: -1,
            },
            writer: "".into(),
            letterer: "".into(),
            editor: "".into(),
            translator: "".into(),
            publisher: "".into(),
            genre: "".into(),
            tags: vec![],
            page_count: 0,
            language: "en".into(),
            characters: vec![],
            age_rating: "Unknown".into()
        }
    }
}

impl Serialize for Metadata {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: serde::Serializer {
        let mut out_state = serializer.serialize_struct("Metadata", 22)?;
        out_state.serialize_field("@xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance")?;
        out_state.serialize_field("@xsi:noNamespaceSchemaLocation", "ComicInfo.xsd")?;
        out_state.serialize_field("Series", &self.series_title)?;
        out_state.serialize_field("Title", &self.title)?;

        out_state.serialize_field("Number", &self.chapter_number)?;
        out_state.serialize_field("Count", &self.total_chapter_count)?;
        out_state.serialize_field("Volume", &self.volume_number)?;

        if self.summary != "" {
            out_state.serialize_field("Summary", &self.summary)?;
        }

        out_state.serialize_field("Year", &self.release_date.year)?;
        out_state.serialize_field("Month", &self.release_date.month)?;
        out_state.serialize_field("Day", &self.release_date.day)?;

        if self.writer != "" {
            out_state.serialize_field("Writer", &self.writer)?;
        }

        if self.letterer != "" {
            out_state.serialize_field("Letterer", &self.letterer)?;
        }

        if self.editor != "" {
            out_state.serialize_field("Editor", &self.editor)?;
        }

        if self.translator != "" {
            out_state.serialize_field("Translator", &self.translator)?;
        }

        if self.publisher != "" {
            out_state.serialize_field("Publisher", &self.publisher)?;
        }

        out_state.serialize_field("Genre", &self.genre)?;

        if self.tags.len() != 0 {
            out_state.serialize_field("Tags", &self.tags.join(", "))?;
        }

        out_state.serialize_field("PageCount", &self.page_count)?;

        out_state.serialize_field("LanguageISO", &self.language)?;

        if self.characters.len() != 0 {
            out_state.serialize_field("Characters", &self.characters.join(", "))?;
        }

        out_state.serialize_field("AgeRating", &self.age_rating)?;

        out_state.end()
    }
}

impl Metadata {
    pub(crate) fn save_to_xml(&self, path: &str) {
        let mut file = File::create(path).unwrap();
        let mut buffer = String::new();
        let root = "ComicInfo";

        let mut ser = Serializer::with_root(&mut buffer, Some(root)).unwrap();
        ser.indent(' ', 4);

        self.serialize(ser).unwrap();
        file.write(buffer.as_bytes()).unwrap();
    }
}

#[derive(Debug, Deserialize, PartialEq, Clone)]
pub(crate) struct ReleaseDate {
    year: i16,
    month: i8,
    day: i8
}

/*#[derive(strum_macros::Display, Debug, PartialEq, strum_macros::EnumIter, Serialize, Deserialize, Clone)]
#[serde(tag = "AgeRating")]
pub(crate) enum AgeRating {
    #[strum(serialize="Unknown")]
    Unknown,
    #[strum(serialize="Adults Only 18+")]
    #[serde(rename="Adults Only 18+")]
    AdultsOnly,
    #[strum(serialize="Early Childhood")]
    #[serde(rename="Early Childhood")]
    EarlyChildhood,
    #[strum(serialize="Everyone")]
    Everyone,
    #[strum(serialize="Everyone 10+")]
    #[serde(rename="Everyone 10+")]
    Everyone10,
    #[strum(serialize="G")]
    G,
    #[strum(serialize="Kids to Adults")]
    #[serde(rename="Kids to Adults")]
    KidsAdults,
    #[strum(serialize="M")]
    M,
    #[strum(serialize="MA15+")]
    #[serde(rename="MA15+")]
    MA15,
    #[strum(serialize="Mature 17+")]
    #[serde(rename="Mature 17+")]
    Mature,
    #[strum(serialize="PG")]
    PG,
    #[strum(serialize="R18+")]
    #[serde(rename="R18+")]
    R18,
    #[strum(serialize="Rating Pending")]
    #[serde(rename="Rating Pending")]
    RatingPending,
    #[strum(serialize="Teen")]
    Teen,
    #[strum(serialize="X18+")]
    #[serde(rename="X18+")]
    X18
}

#[derive(strum_macros::Display, Debug, PartialEq, strum_macros::EnumIter, Serialize, Deserialize, Clone)]
#[serde(tag = "LanguageISO")]
pub(crate) enum LanguageISO {
    #[strum(serialize="en")]
    #[serde(rename="en")]
    EN,
    #[strum(serialize="jp")]
    #[serde(rename="jp")]
    JP
}*/