use crate::column::{ColumnKind, ListKind, PubkeySource};
use crate::timeline::Timeline;
use crate::Error;
use enostr::{Filter, Keypair, Pubkey, SecretKey};
use nostrdb::{Ndb, Transaction};
use tracing::{error, info};

pub struct Args {
    pub columns: Vec<ArgColumn>,
    pub relays: Vec<String>,
    pub is_mobile: Option<bool>,
    pub keys: Vec<Keypair>,
    pub since_optimize: bool,
    pub light: bool,
    pub dbpath: Option<String>,
}

impl Args {
    pub fn parse(args: &[String]) -> Self {
        let mut res = Args {
            columns: vec![],
            relays: vec![],
            is_mobile: None,
            keys: vec![],
            light: false,
            since_optimize: true,
            dbpath: None,
        };

        let mut i = 0;
        let len = args.len();
        while i < len {
            let arg = &args[i];

            if arg == "--mobile" {
                res.is_mobile = Some(true);
            } else if arg == "--light" {
                res.light = true;
            } else if arg == "--dark" {
                res.light = false;
            } else if arg == "--pub" || arg == "--npub" {
                i += 1;
                let pubstr = if let Some(next_arg) = args.get(i) {
                    next_arg
                } else {
                    error!("sec argument missing?");
                    continue;
                };

                if let Ok(pk) = Pubkey::parse(pubstr) {
                    res.keys.push(Keypair::only_pubkey(pk));
                } else {
                    error!(
                        "failed to parse {} argument. Make sure to use hex or npub.",
                        arg
                    );
                }
            } else if arg == "--sec" || arg == "--nsec" {
                i += 1;
                let secstr = if let Some(next_arg) = args.get(i) {
                    next_arg
                } else {
                    error!("sec argument missing?");
                    continue;
                };

                if let Ok(sec) = SecretKey::parse(secstr) {
                    res.keys.push(Keypair::from_secret(sec));
                } else {
                    error!(
                        "failed to parse {} argument. Make sure to use hex or nsec.",
                        arg
                    );
                }
            } else if arg == "--no-since-optimize" {
                res.since_optimize = false;
            } else if arg == "--filter" {
                i += 1;
                let filter = if let Some(next_arg) = args.get(i) {
                    next_arg
                } else {
                    error!("filter argument missing?");
                    continue;
                };

                if let Ok(filter) = Filter::from_json(filter) {
                    res.columns.push(ArgColumn::Generic(vec![filter]));
                } else {
                    error!("failed to parse filter '{}'", filter);
                }
            } else if arg == "--dbpath" {
                i += 1;
                let path = if let Some(next_arg) = args.get(i) {
                    next_arg
                } else {
                    error!("dbpath argument missing?");
                    continue;
                };
                res.dbpath = Some(path.clone());
            } else if arg == "-r" || arg == "--relay" {
                i += 1;
                let relay = if let Some(next_arg) = args.get(i) {
                    next_arg
                } else {
                    error!("relay argument missing?");
                    continue;
                };
                res.relays.push(relay.clone());
            } else if arg == "--column" || arg == "-c" {
                i += 1;
                let column_name = if let Some(next_arg) = args.get(i) {
                    next_arg
                } else {
                    error!("column argument missing");
                    continue;
                };

                if let Some(rest) = column_name.strip_prefix("contacts:") {
                    if let Ok(pubkey) = Pubkey::parse(rest) {
                        info!("got contact column for user {}", pubkey.hex());
                        res.columns.push(ArgColumn::Column(ColumnKind::contact_list(
                            PubkeySource::Explicit(pubkey),
                        )))
                    } else {
                        error!("error parsing contacts pubkey {}", &column_name[9..]);
                        continue;
                    }
                } else if column_name == "contacts" {
                    res.columns.push(ArgColumn::Column(ColumnKind::contact_list(
                        PubkeySource::DeckAuthor,
                    )))
                }
            } else if arg == "--filter-file" || arg == "-f" {
                i += 1;
                let filter_file = if let Some(next_arg) = args.get(i) {
                    next_arg
                } else {
                    error!("filter file argument missing?");
                    continue;
                };

                let data = if let Ok(data) = std::fs::read(filter_file) {
                    data
                } else {
                    error!("failed to read filter file '{}'", filter_file);
                    continue;
                };

                if let Some(filter) = std::str::from_utf8(&data)
                    .ok()
                    .and_then(|s| Filter::from_json(s).ok())
                {
                    res.columns.push(ArgColumn::Generic(vec![filter]));
                } else {
                    error!("failed to parse filter in '{}'", filter_file);
                }
            }

            i += 1;
        }

        if res.columns.is_empty() {
            let ck = ColumnKind::contact_list(PubkeySource::DeckAuthor);
            info!("No columns set, setting up defaults: {:?}", ck);
            res.columns.push(ArgColumn::Column(ck));
        }

        res
    }
}

/// A way to define columns from the commandline. Can be column kinds or
/// generic queries
pub enum ArgColumn {
    Column(ColumnKind),
    Generic(Vec<Filter>),
}

impl ArgColumn {
    pub fn into_timeline(self, ndb: &Ndb, user: Option<&[u8; 32]>) -> Timeline {
        match self {
            ArgColumn::Generic(filters) => Timeline::new(ColumnKind::Generic, Some(filters)),

            ArgColumn::Column(ColumnKind::Universe) => {
                Timeline::new(ColumnKind::Universe, Some(vec![]))
            }

            ArgColumn::Column(ColumnKind::Generic) => {
                panic!("Not a valid ArgColumn")
            }

            ArgColumn::Column(ColumnKind::List(ListKind::Contact(ref pk_src))) => {
                let pk = match pk_src {
                    PubkeySource::DeckAuthor => {
                        if let Some(user_pk) = user {
                            user_pk
                        } else {
                            // No user loaded, so we have to return an unloaded
                            // contact list columns
                            return Timeline::new(
                                ColumnKind::contact_list(PubkeySource::DeckAuthor),
                                None,
                            );
                        }
                    }
                    PubkeySource::Explicit(pk) => pk.bytes(),
                };

                let contact_filter = Filter::new().authors([pk]).kinds([3]).limit(1).build();
                let txn = Transaction::new(ndb).expect("txn");
                let results = ndb
                    .query(&txn, vec![contact_filter], 1)
                    .expect("contact query failed?");

                if results.is_empty() {
                    return Timeline::new(ColumnKind::contact_list(pk_src.to_owned()), None);
                }

                match Timeline::contact_list(&results[0].note) {
                    Err(Error::EmptyContactList) => {
                        Timeline::new(ColumnKind::contact_list(pk_src.to_owned()), None)
                    }
                    Err(e) => panic!("Unexpected error: {e}"),
                    Ok(tl) => tl,
                }
            }
        }
    }
}