use anyhow::Context;
/*
    This file is part of jellything (https://codeberg.org/metamuffin/jellything)
    which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
    Copyright (C) 2023 metamuffin <metamuffin.org>
*/
use clap::{Parser, Subcommand};
use jellycommon::ItemInfo;
use jellymatroska::read::EbmlReader;
use jellyremuxer::import::import_read;
use jellytools::tmdb::{tmdb_details, tmdb_image, tmdb_search};
use log::{info, warn};
use std::{
    fs::File,
    io::{stdin, Write},
    path::PathBuf,
    process::exit,
};

#[derive(Parser)]
struct Args {
    #[arg(short = 'N', long)]
    dry: bool,
    #[clap(subcommand)]
    action: Action,
}

#[derive(Subcommand)]
enum Action {
    Create {
        path: PathBuf,
        #[arg(short, long)]
        title: Option<String>,
        #[arg(short = 'T', long)]
        tmdb: Option<String>,
        #[arg(short = 'i', long)]
        input: PathBuf,
    },
    Set {
        #[arg(short = 'I', long)]
        item: PathBuf,
        #[arg(short, long)]
        banner: Option<PathBuf>,
        #[arg(short, long)]
        title: Option<String>,
        #[arg(short = 'D', long)]
        description_head: Option<String>,
        #[arg(short = 'd', long)]
        description: Option<String>,
        #[arg(short = 'c', long)]
        clear_inputs: bool,
        #[arg(short = 'i', long, num_args(0..))]
        input: Vec<PathBuf>,
    },
}

fn main() -> anyhow::Result<()> {
    env_logger::builder()
        .filter_level(log::LevelFilter::Info)
        .parse_env("LOG")
        .init();
    let args = Args::parse();

    match args.action {
        Action::Create {
            path,
            title,
            tmdb: id,
            input,
        } => {
            let key = std::env::var("TMDB_API_KEY").context("tmdb api key required")?;
            let id = if let Some(id) = id {
                id.parse().unwrap()
            } else {
                let title = title.unwrap();
                let results = tmdb_search(&title, &key)?;
                info!("results:");
                for (i, r) in results.results.iter().enumerate() {
                    info!("\t[{i}] {}: {}", r.id, r.title);
                }
                let res_index = if results.results.len() != 1 {
                    stdin()
                        .lines()
                        .next()
                        .unwrap()
                        .unwrap()
                        .parse::<usize>()
                        .unwrap()
                } else {
                    0
                };
                results.results[res_index].id
            };

            let details = tmdb_details(id, &key).context("fetching details")?;
            let ident = make_ident(&details.title);
            let path = path.join(&ident);
            std::fs::create_dir_all(&path)?;

            let poster = details
                .poster_path
                .map(|p| {
                    let pu = path.join("poster.jpeg");
                    let mut f = File::create(&pu)?;
                    tmdb_image(&p, &mut f)?;
                    Ok::<_, anyhow::Error>(pu)
                })
                .transpose()?;
            let backdrop = details
                .backdrop_path
                .map(|p| {
                    let pu = path.join("backdrop.jpeg");
                    let mut f = File::create(&pu)?;
                    tmdb_image(&p, &mut f)?;
                    Ok::<_, anyhow::Error>(pu)
                })
                .transpose()?;

            let mut iteminfo = ItemInfo {
                poster,
                backdrop,
                description: details.overview,
                description_head: details.tagline,
                title: details.title,
                duration: Default::default(),
                tracks: Default::default(),
            };
            info!("{iteminfo:#?}");
            info!("is this correct? [y/n]");
            if stdin().lines().next().unwrap().unwrap() != "y" {
                exit(0)
            }

            let source_path = path.join(format!("source.mkv"));
            // std::fs::rename(&input, &source_path)?;
            // std::os::unix::fs::symlink(&input, &source_path)?;
            std::fs::copy(&input, &source_path)?;
            let input = File::open(&source_path).unwrap();
            let mut input = EbmlReader::new(input);
            import_read(&source_path, &mut input, &mut iteminfo)?;

            let k = serde_json::to_string_pretty(&iteminfo)?;
            if args.dry {
                println!("{k}")
            } else {
                let mut f = File::create(path.join(format!("{ident}.jelly")))?;
                f.write_all(k.as_bytes())?;
            }

            Ok(())
        }
        Action::Set {
            banner,
            clear_inputs,
            description,
            description_head,
            input,
            item,
            title,
        } => {
            let mut iteminfo: ItemInfo = match File::open(item.clone()) {
                Ok(f) => serde_json::from_reader(f)?,
                Err(e) => {
                    warn!("could not load item info: {e}");
                    warn!("using the default instead");
                    ItemInfo {
                        duration: 0.0,
                        poster: None,
                        backdrop: None,
                        description_head: "Lorem ipsum!".to_string(),
                        description: "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.".to_string(),
                        title: item.to_str().unwrap().to_string(),
                        tracks: Default::default(),
                    }
                }
            };

            if let Some(title) = title {
                iteminfo.title = title;
            }
            if let Some(banner) = banner {
                iteminfo.poster = Some(banner);
            }
            if let Some(d) = description {
                iteminfo.description = d;
            }
            if let Some(d) = description_head {
                iteminfo.description_head = d;
            }
            if clear_inputs {
                iteminfo.tracks = Default::default()
            }

            for input_path in input {
                let input = File::open(input_path.clone()).unwrap();
                let mut input = EbmlReader::new(input);
                import_read(&input_path, &mut input, &mut iteminfo)?;
            }

            let k = serde_json::to_string_pretty(&iteminfo)?;
            if args.dry {
                println!("{k}")
            } else {
                let mut f = File::create(item)?;
                f.write_all(k.as_bytes())?;
            }
            Ok(())
        }
    }
}

fn make_ident(s: &str) -> String {
    let mut out = String::new();
    for s in s.chars() {
        match s {
            'a'..='z' => out.push(s),
            'A'..='Z' => out.push(s.to_ascii_lowercase()),
            '-' | ' ' | '_' => out.push('-'),
            _ => (),
        }
    }
    out
}