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    /*
     * Copyright (C) 2021  Aravinth Manivannan <realaravinth@batsense.net>
     *
     * This program is free software: you can redistribute it and/or modify
     * it under the terms of the GNU Affero General Public License as
     * published by the Free Software Foundation, either version 3 of the
     * License, or (at your option) any later version.
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU Affero General Public License for more details.
     *
     * You should have received a copy of the GNU Affero General Public License
     * along with this program.  If not, see <https://www.gnu.org/licenses/>.
     */
    use std::{collections::HashMap, hash::Hash};

    use crate::data::*;
    use crate::proxy::StringUtils;
    use get_post::*;

    #[derive(Eq, PartialEq)]
    enum PostitionType {
        Start,
        End,
    }

    struct ListState {
        in_uli: bool,
        in_oli: bool,
    }

    impl Default for ListState {
        fn default() -> Self {
            Self {
                in_uli: false,
                in_oli: false,
            }
        }
    }

    struct Markup<'a, 'b> {
        markup: &'a GetPostPostContentBodyModelParagraphsMarkups,
        p: &'a GetPostPostContentBodyModelParagraphs,
        pos_type: PostitionType,
        gists: &'b Option<Vec<(String, crate::data::GistContent)>>,
    }

    impl<'a, 'b> Markup<'a, 'b> {
        fn start(
            p: &GetPostPostContentBodyModelParagraphs,
            gists: &'b Option<Vec<(String, crate::data::GistContent)>>,
            pindex: usize,
            state: &mut ListState,
        ) -> String {
            let list = Self::list_close(p, state);
            let resp = if p.type_ == "IMG" {
                let metadata = p.metadata.as_ref().unwrap();
                format!(
                    r#"<figure><img width="{}" src="{}" /> <figcaption>"#,
                    metadata.original_width.as_ref().unwrap(),
                    crate::V1_API_ROUTES.proxy.get_medium_asset(&metadata.id)
                )
            } else if p.type_ == "P" {
                "<p>".into()
            } else if p.type_ == "PRE" {
                "<pre>".into()
            } else if p.type_ == "BQ" || p.type_ == "PQ" {
                "<blockquote>".into()
            } else if p.type_ == "H1" {
                "<h1>".into()
            } else if p.type_ == "H2" {
                "<h2>".into()
            } else if p.type_ == "H3" {
                if pindex == 0 {
                    log::debug!("caught heading");
                    "".into()
                } else {
                    "<h3>".into()
                }
            } else if p.type_ == "H4" {
                "<h4>".into()
            } else if p.type_ == "H5" {
                "<h5>".into()
            } else if p.type_ == "H6" {
                "<h6>".into()
            } else if p.type_ == "IFRAME" {
                let src = &p
                    .iframe
                    .as_ref()
                    .unwrap()
                    .media_resource
                    .as_ref()
                    .unwrap()
                    .href;
                if src.contains("gist.github.com") {
                    let gist_id = crate::data::Data::get_gist_id(src);
                    let (_, gist) = gists
                        .as_ref()
                        .unwrap()
                        .iter()
                        .find(|(id, _)| id == gist_id)
                        .as_ref()
                        .unwrap();

                    let mut gists = String::default();
                    for file in &gist.files {
                        gists += &format!(
                            r#"<div class="code-block gist-block">{}</div>"#,
                            file.get_html_content()
                        );
                    }
                    format!(
                        r#"<div class="gist_container">{gists}
                         <a class="gist_link" href="{}" target="_blank">See gist on GitHub</a>"#,
                        &gist.html_url
                    )
                } else {
                    format!(r#"<iframe src="{src}" frameborder="0">"#)
                }
            } else if p.type_ == "ULI" {
                if state.in_uli {
                    "<li>".into()
                } else {
                    state.in_uli = true;
                    "<ul><li>".into()
                }
            } else if p.type_ == "OLI" {
                if state.in_oli {
                    "<li>".into()
                } else {
                    state.in_oli = true;
                    "<ol><li>".into()
                }
            } else if p.type_ == "MIXTAPE_EMBED" {
                "<div class='mixtape'><p>".into()
            } else {
                log::info!("Unknown type: {}", p.type_);
                r#"
                    <p class="libmedium__meta">
                        <b>From LibMedium:</b> LibMedium is built by reverse
                        engineering the Meduim's internal API. This post contains
                        markup(formatting rules) that we are unaware of.
                        Please report this URL <a
                        href="https://github.com/realaravinth/libmedium/issues/1"
                        rel="noreferrer">on our bug tracker</a> so that we can
                        improve page rendering.
                        <br />
                        Alternatively, you can also email me at realaravinth at batsense dot net!
                      </p>
                <span>"#
                    .into()
            };

            match list {
                Some(list) => format!("{list}{resp}"),
                None => resp,
            }
        }

        fn end(
            p: &GetPostPostContentBodyModelParagraphs,
            pindex: usize,
            state: &mut ListState,
        ) -> String {
            let resp: String = if p.type_ == "IMG" {
                "</figcaption></figure>".into()
            } else if p.type_ == "P" {
                "</p>".into()
            } else if p.type_ == "PRE" {
                "</pre>".into()
            } else if p.type_ == "BQ" || p.type_ == "PQ" {
                "</blockquote>".into()
            } else if p.type_ == "H1" {
                "</h1>".into()
            } else if p.type_ == "H2" {
                "</h2>".into()
            } else if p.type_ == "H3" {
                if pindex == 0 {
                    log::debug!("caught heading");
                    "".into()
                } else {
                    "</h3>".into()
                }
            } else if p.type_ == "H4" {
                "</h4>".into()
            } else if p.type_ == "H5" {
                "</h5>".into()
            } else if p.type_ == "H6" {
                "</h6>".into()
            } else if p.type_ == "IFRAME" {
                let src = &p
                    .iframe
                    .as_ref()
                    .unwrap()
                    .media_resource
                    .as_ref()
                    .unwrap()
                    .href;
                if src.contains("gist.github.com") {
                    "</div>".into()
                } else {
                    "</iframe>".into()
                }
            } else if p.type_ == "OLI" || p.type_ == "ULI" {
                "</li>".into()
            } else if p.type_ == "MIXTAPE_EMBED" {
                "</p></div>".into()
            } else {
                "</span>".into()
            };
            if state.in_oli {
                if p.type_ != "OLI" {
                    state.in_oli = false;
                    format!("</ol>{resp}")
                } else {
                    resp
                }
            } else if state.in_uli {
                if p.type_ != "ULI" {
                    state.in_uli = false;
                    format!("</ul>{resp}")
                } else {
                    resp
                }
            } else {
                resp
            }
        }

        fn list_close(
            p: &GetPostPostContentBodyModelParagraphs,
            state: &mut ListState,
        ) -> Option<String> {
            if state.in_oli {
                if p.type_ != "OLI" {
                    state.in_oli = false;
                    return Some(format!("</ol>"));
                }
            };
            if state.in_uli {
                if p.type_ != "ULI" {
                    state.in_uli = false;
                    return Some(format!("</ul>"));
                }
            };
            None
        }

        fn apply_markup(&self, pindex: usize) -> String {
            if self.markup.type_ == "A" {
                if let Some(anchor_type) = &self.markup.anchor_type {
                    if anchor_type == "LINK" {
                        if self.pos_type == PostitionType::Start {
                            format!(
                                r#"<a rel="noreferrer" href="{}">"#,
                                self.markup.href.as_ref().unwrap()
                            )
                        } else {
                            "</a>".into()
                        }
                    } else if anchor_type == "USER" {
                        if self.pos_type == PostitionType::Start {
                            format!(
                                r#"<a rel="noreferrer" href="https://medium.com/u/{}">"#,
                                self.markup.user_id.as_ref().unwrap()
                            )
                        } else {
                            "</a>".into()
                        }
                    } else {
                        //             log::error!("unknown markup.anchor_type: {:?} post id {}", anchor_type, id);
                        if self.pos_type == PostitionType::Start {
                            "<span>".into()
                        } else {
                            "</span>".into()
                        }
                    }
                } else {
                    //             log::error!("unknown markup.anchor_type: {:?} post id {}", anchor_type, id);
                    if self.pos_type == PostitionType::Start {
                        "<span>".into()
                    } else {
                        "</span>".into()
                    }
                }
            } else if self.markup.type_ == "PRE" {
                if self.pos_type == PostitionType::Start {
                    "<pre>".into()
                } else {
                    "</pre>".into()
                }
            } else if self.markup.type_ == "EM" {
                if self.pos_type == PostitionType::Start {
                    "<em>".into()
                } else {
                    "</em>".into()
                }
            } else if self.markup.type_ == "STRONG" {
                if self.pos_type == PostitionType::Start {
                    "<strong>".into()
                } else {
                    "</strong>".into()
                }
            } else if self.markup.type_ == "CODE" {
                if self.pos_type == PostitionType::Start {
                    "<code>".into()
                } else {
                    "</code>".into()
                }
            } else {
                // log::error!("unknown markup.type_: {:?} post id {}", markup.type_, id);
                if self.pos_type == PostitionType::Start {
                    log::info!("Unknown type");
                    r#"
                    <p class="libmedium__meta">
                        <b>From LibMedium:</b> LibMedium is built by reverse
                        engineering the Meduim's internal API. This post contains
                        markup(formatting rules) that we are unaware of.
                        Please report this URL <a
                        href="https://github.com/realaravinth/libmedium/issues/1"
                        rel="noreferrer">on our bug tracker</a> so that we can
                        improve page rendering.
                        <br />
                        Alternatively, you can also email me at realaravinth at batsense dot net!
                      </p>
                <span>"#
                        .into()
                } else {
                    "</span>".into()
                }
            }
        }
    }

    #[derive(Default)]
    struct PositionMap<'a, 'b> {
        map: HashMap<i64, Vec<Markup<'a, 'b>>>,
        arr: Vec<i64>,
    }

    impl<'a, 'b> PositionMap<'a, 'b> {
        fn insert_if_not_exists(&mut self, pos: i64, m: Markup<'a, 'b>) {
            if let Some(markups) = self.map.get_mut(&pos) {
                markups.push(m);
            } else {
                self.map.insert(pos, vec![m]);
                self.arr.push(pos);
            }
        }
    }

    pub fn apply_markup<'b>(
        data: &PostResp,
        gists: &'b Option<Vec<(String, crate::data::GistContent)>>,
    ) -> Vec<String> {
        let mut paragraphs: Vec<String> = Vec::with_capacity(data.content.body_model.paragraphs.len());
        let mut state = ListState::default();
        for (pindex, p) in data.content.body_model.paragraphs.iter().enumerate() {
            let mut pos = PositionMap::default();
            if p.type_ == "H3" && pindex == 0 {
                log::debug!("FOUND TOP LEVEL H3. Breaking");
                continue;
            }
            for m in p.markups.iter() {
                let start_markup = Markup {
                    markup: &m,
                    p,
                    gists,
                    pos_type: PostitionType::Start,
                };
                pos.insert_if_not_exists(m.start, start_markup);
                let end_markup = Markup {
                    markup: &m,
                    p,
                    gists,
                    pos_type: PostitionType::End,
                };

                pos.insert_if_not_exists(m.end, end_markup);
            }

            let mut cur = 0;

            fn incr_cur(cur: usize, point: i64) -> usize {
                let incr = point as usize - cur;
                let post_incr = cur + incr;
                log::debug!(
                    "cur before incr: {cur}, incr by: {}, post incr: {}",
                    incr,
                    post_incr
                );
                post_incr
            }

            let mut content = String::with_capacity(p.text.len());
            content += &Markup::start(&p, &gists, pindex, &mut state);
            pos.arr.sort();
            if let Some(first) = pos.arr.get(0) {
                //content += p.text.substring(cur, *first as usize);
                content += p.text.slice(cur..*first as usize);
                cur = incr_cur(cur, *first);
                for point in pos.arr.iter() {
                    //content.push(p.text.substring(start, start + point);
                    //            if *point != 0 {

                    if cur != *point as usize {
                        //           content += p.text.substring(cur, *point as usize);
                        content += p.text.slice(cur..*point as usize);
                    }
                    //           }
                    let pos_markups = pos.map.get(point).unwrap();
                    for m in pos_markups.iter() {
                        content += &m.apply_markup(pindex);
                    }
                    cur = incr_cur(cur, *point);
                }
                log::debug!("LAST");
                content += p.text.slice(cur..);
                content += &Markup::end(&p, pindex, &mut state);
            } else {
                log::debug!("LAST WITH NO MARKUP");
                content += p.text.slice(cur..);
                content += &Markup::end(&p, pindex, &mut state);
            }
            paragraphs.push(content);
        }
        paragraphs
    }