use anyhow::{format_err, Result};
use chrono::{DateTime, Local, NaiveDate, TimeZone, Utc};
use html2md::parse_html;
use megalodon::{generator, megalodon::GetLocalTimelineInputOptions, response::Response};
use std::env;

#[derive(Debug)]
struct Post {
    content: String,
    created_at: DateTime<Utc>,
}

#[tokio::main]
async fn main() -> Result<()> {
    env_logger::init();

    let start = Local
        .from_local_datetime(
            &NaiveDate::from_ymd_opt(2023, 7, 1)
                .ok_or_else(|| format_err!("Invallid date!"))?
                .and_hms_opt(0, 0, 0)
                .expect("Failed to construct time!"),
        )
        .unwrap();

    let end = Local
        .from_local_datetime(
            &NaiveDate::from_ymd_opt(2023, 7, 1)
                .ok_or_else(|| format_err!("Invallid date!"))?
                .and_hms_opt(23, 59, 59)
                .expect("Failed to construct time!"),
        )
        .unwrap();

    println!("Date {:#?}", start);

    let url = env::var("MASTODON_URL")?;
    let token = env::var("MASTODON_ACCESS_TOKEN")?;
    let client = generator(megalodon::SNS::Mastodon, url, Some(token), None);
    let mut max_id: Option<String> = None;
    loop {
        let Response { json, .. } = if let Some(max_id) = max_id.as_ref() {
            client
                .get_local_timeline(Some(&GetLocalTimelineInputOptions {
                    max_id: Some(max_id.clone()),
                    ..GetLocalTimelineInputOptions::default()
                }))
                .await?
        } else {
            client.get_local_timeline(None).await?
        };

        if let Some(last) = json.last() {
            println!(
                "Checking {:?} against {:?}: {}",
                last.created_at,
                start,
                last.created_at > start
            );
            if last.created_at > start {
                max_id.replace(last.id.clone());
                continue;
            }
        }
        println!(
            "{:#?}",
            json.iter()
                .filter(|json| start <= json.created_at && json.created_at <= end)
                .map(|json| Post {
                    content: parse_html(&json.content),
                    created_at: json.created_at
                })
                .collect::<Vec<Post>>()
        );
        break;
    }
    Ok(())
}