use maud::{html, Markup, DOCTYPE};
use rocket::{Rocket,Build,launch,get,routes,fs::{FileServer}};
use std::{fs::OpenOptions, io::BufReader, collections::HashMap};
use chrono::prelude::*;

const TELEGRAM_TIMESTAMP_FORMAT: &str = "%FT%X";

#[derive(Debug, Clone, PartialEq, serde::Serialize, serde::Deserialize)]
#[serde(rename_all = "snake_case")]
enum MediaType {
    Sticker,
    Animation,
    VideoFile,
    AudioFile,
    VoiceMessage,
    VideoMessage
}

#[derive(Debug, Clone)]
struct ScoredChatMessage {
    pub chat_message: ChatMessage,
    pub last_used: NaiveDateTime,
    pub times: u32
}

impl TryFrom<ChatMessage> for ScoredChatMessage {
    type Error = chrono::format::ParseError;
    
    fn try_from(value: ChatMessage) -> Result<Self, Self::Error> {
        Ok(ScoredChatMessage {
            chat_message: value.clone(),
            last_used: NaiveDateTime::parse_from_str(&value.date, TELEGRAM_TIMESTAMP_FORMAT)?,
            times: 1
        })
    }
}


impl From<ScoredChatMessage> for Markup {
    fn from(item: ScoredChatMessage) -> Markup {
        if let Some(mime_type) = &item.chat_message.mime_type {
            let message_file = item.chat_message.file.expect("No sticker file");
            let message_date = item.last_used;
            match mime_type.as_str() {
                "image/webp" => {
                    return html! {
                        .sticker {
                            img loading="lazy" src=(message_file);
                            p { "Times used: " (item.times) br; (message_date.format("%Y-%m-%d %H:%M:%S")) }
                        }
                    };
                }
                "video/webm" => {
                    return html! {
                        .sticker.animated {
                            video loading="lazy" autoplay loop controls src=(message_file) {}
                            p { "Times used: " (item.times) br; (message_date.format("%Y-%m-%d %H:%M:%S")) }
                        }
                    }
                }
                "application/x-tgsticker" => {
                    return html! {
                        .sticker.animated {
                            tgs-player loading="lazy" autoplay loop controls src=(message_file) {}
                            p { "Times used: " (item.times) br; (message_date.format("%Y-%m-%d %H:%M:%S")) }
                        }
                    }
                }
                _ => {
                    return html! {
                        p { "Unknown type " (mime_type) }
                    };
                }
            }
        } else {
            return html! {
                p { "No type" }
            };
        }

    } 
}


#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
struct ChatMessage {
    pub media_type: Option<MediaType>,
    pub mime_type: Option<String>,
    pub file: Option<String>,
    pub date_unixtime: String,
    pub date: String
}


#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
struct Chat {
    name: String,
    messages: Vec<ChatMessage>
}


#[launch]
fn rocket() -> Rocket<Build> {
    rocket::build()
        .mount("/", routes![index])
        .mount("/stickers", FileServer::from("./stickers"))
        .mount("/video_files", FileServer::from("./video_files"))
}

#[get("/")]
fn index() -> Markup {
    let tg_export_result: Chat = serde_json::from_reader(
        BufReader::new(OpenOptions::new().read(true).open("./result.json").expect("Could not open ./result.json"))
    ).expect("Could not parse result.json");

    let mut messages: Vec<ScoredChatMessage> = tg_export_result.messages.into_iter()
        .filter(|m| matches!(m.media_type, Some(MediaType::Sticker)))
        .fold(HashMap::new(), |mut acc: HashMap<String, ScoredChatMessage>, message| {
            if let Some(ref file) = message.file {
                let message_date = NaiveDateTime::parse_from_str(&message.date, TELEGRAM_TIMESTAMP_FORMAT)
                    .expect("Could not parse date");
                let entry = acc.entry(file.to_owned()).or_insert_with(|| ScoredChatMessage::try_from(message)
                    .expect("Could not parse date"));
                entry.last_used = entry.last_used.max(message_date);
                entry.times += 1;
            }
            acc
        })
        .into_values()
        .collect();

    messages.sort_by(|a, b| b.times.cmp(&a.times));

    return html! {
        (DOCTYPE)
        head {
            script src="https://unpkg.com/@lottiefiles/lottie-player@0.4.0/dist/tgs-player.js" {}
        }
        body {
            style {
                r#"* { box-sizing: border-box; }

                    h1 {text-align: center;}

                    body {
                        width: 100vw;
                        margin: 0;
                        padding: 0;
                    }

                    .container {
                        max-width: 1024px;
                        margin: 0 auto;
                    }

                    .container,
                    .stickers,
                    .sticker {
                        display: flex;
                        position: relative;
                        flex-flow: row wrap;
                    }

                    .sticker {
                        flex: 0 0 25%;
                        align-items: flex-end;
                        padding: 1rem;
                        border: 1px solid #00000055;
                    }

                    .sticker p {
                        flex: 1;
                        text-align: center;
                    }

                    img, video, tgs-player {
                        width: 100%;
                        height: auto;
                        margin: 0 auto;
                        aspect-ratio: 1 / 1;
                        object-fit: contain;
                    }"#
            }
            .container {
                h1 { "Stickers with " (tg_export_result.name) }
                .stickers {
                    @for message in messages {
                        (<ScoredChatMessage as Into<Markup>>::into(message))
                    }
                }
            }
        }
    };
}