use reqwest::blocking::Client;
use scraper::{Html, Selector};
use serde::{Deserialize, Serialize};
use std::fs;

const BASE: &str = "https://letterboxd.com";
const LIST: &str = "https://letterboxd.com/mimuuu/list/2026/by/reverse/";

#[derive(Deserialize)]
struct FilmJson {
    name: String,
    released: Released,
    directors: Vec<Person>,
}

#[derive(Deserialize)]
struct Released {
    year: u16,
}

#[derive(Deserialize)]
struct Person {
    name: String,
}

#[derive(Serialize)]
struct Film {
    title: String,
    year: u16,
    director: String,
    url: String,
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::builder().user_agent("Mozilla/5.0").build()?;

    // One request: list page (only to discover the 5 film endpoints)
    let html = client.get(LIST).send()?.text()?;
    let doc = Html::parse_document(&html);
    let selector = Selector::parse("li.posteritem div.react-component")?;

    let mut films = Vec::new();

    for node in doc.select(&selector).take(5) {
        let details = node.value().attr("data-details-endpoint").unwrap();

        let slug = node.value().attr("data-item-link").unwrap();

        // One request per film: JSON metadata
        let film: FilmJson = client.get(format!("{BASE}{details}")).send()?.json()?;

        films.push(Film {
            title: film.name,
            year: film.released.year,
            director: film
                .directors
                .first()
                .map(|d| d.name.clone())
                .unwrap_or_default(),
            url: format!("{BASE}{slug}"),
        });
    }

    fs::create_dir_all("data")?;
    fs::write("data/films.json", serde_json::to_string_pretty(&films)?)?;

    println!("Saved {} films", films.len());
    Ok(())
}