use mwbot::{
    Bot, Page,
    generators::{Generator, querypage::QueryPage, search::Search},
};
use crate::fetching::DynWsdcFetcher;

pub async fn wanted_ids(bot: Bot, _fetcher: DynWsdcFetcher) -> Vec<(u32, Page)> {
    let mut gene = QueryPage::new("Wantedpages").generate(&bot);
    let mut result = vec![];
    while let Some(x) = gene.recv().await {
        let p = match x {
            Ok(p) => p,
            Err(e) => {
                match e {
                    mwbot::Error::ApiError(a) if &a.code == "assertuserfailed" => {
                        tracing::error!("Bot is logged out: {a}");
                        panic!();
                    }
                    _ => {
                        tracing::error!("Could not get search result: {e}");
                    }
                }
                continue;
            }
        };
        if let Ok(n) = parse_wsdc_page_name(p.title()) {
            result.push((n, p));
        }
    }
    result
}

#[derive(thiserror::Error, Debug)]
enum TitleParseError {
    #[error("Does not contain the correct prefix")]
    NoPrefix,
    #[error("Possibly incorrect page")]
    Sketchy,
}

fn parse_wsdc_page_name(name: &str) -> Result<u32, TitleParseError> {
    if !name.starts_with("WSDC/") {
        return Err(TitleParseError::NoPrefix);
    }
    match name.trim_start_matches("WSDC/").parse::<u32>() {
        Ok(n) => Ok(n),
        Err(e) => {
            tracing::error!("Page {name} does not fit: {e}");
            Err(TitleParseError::Sketchy)
        }
    }
}

#[allow(dead_code)]
pub async fn index_wsdc_ids(bot: &Bot, _fetcher: DynWsdcFetcher) -> Vec<(u32, Page)> {
    let mut gene = Search::new("WSDC/").generate(bot);
    let mut result = vec![];
    while let Some(x) = gene.recv().await {
        let p = match x {
            Ok(p) => p,
            Err(e) => {
                tracing::error!("Could not get search result: {e}");
                continue;
            }
        };
        if let Ok(n) = parse_wsdc_page_name(p.title()) {
            result.push((n, p));
        }
    }
    result
}