use std::rc::Rc;

use yew::prelude::*;
use yew_router::prelude::*;

use crate::Route;
use crate::pages::blog::content;
use crate::pages::blog::content::BlogEntry;

#[derive(Clone, Debug, Eq, PartialEq, Properties)]
pub struct Props {
  pub seed: u8,
}

#[derive(PartialEq, Eq, Debug)]
pub struct PostState {
  pub inner: content::Post,
}

impl Reducible for PostState {
  type Action = u8;
  fn reduce(self: Rc<Self>, action: u8) -> Rc<Self> {
    Self { inner: content::Post::from_seed(action.into()), }.into()
  }
}

#[function_component]
pub fn Entry(props: &Props) -> Html {
  let seed = props.seed;

  let post = use_reducer(|| PostState {
    inner: content::Post::from_seed(seed.into()),
  });

  {
    let post_dispatcher = post.dispatcher();
    use_effect_with(seed, move |seed| {
      post_dispatcher.dispatch(*seed);

      || {}
    });
  }

  let post = &post.inner;

  let render_quote = |quote: &content::Quote| {
    html! {
      <article class="media block box my-6">
        <figure class="media-left">
          <p class="image is-64x64">
            <img alt="The author's profile" src={quote.author.image_url.clone()} loading="lazy" />
          </p>
        </figure>
        <div class="media-content">
          <div class="content">
            <Link<Route> classes={classes!("is-size-5")} to={Route::Author { id: quote.author.seed }}>
              <strong>{ &quote.author.name }</strong>
            </Link<Route>>
            <p class="is-family-secondary">
              { &quote.content }
            </p>
          </div>
        </div>
      </article>
    }
  };

  let render_section_hero = |section: &content::Section| {
    html! {
      <section class="hero is-dark has-background mt-6 mb-3">
        <img alt="This section's image" class="hero-background is-transparent" src={section.image_url.clone()} loading="lazy" />
        <div class="hero-body">
          <div class="container">
            <h2 class="subtitle">{ &section.title }</h2>
          </div>
        </div>
      </section>
    }
  };

  let render_section = |section, show_hero| {
    let hero = if show_hero {
      render_section_hero(section)
    } else {
      html! {}
    };
    let paragraphs = section.paragraphs.iter().map(|paragraph| {
      html! {
        <p>{ paragraph }</p>
      }
    });
    html! {
      <section>
        { hero }
        <div>{ for paragraphs }</div>
      </section>
    }
  };

  let view_content = {
    // don't show hero for the first section
    let mut show_hero = false;

    let parts = post.content.iter().map(|part| match part {
      content::PostPart::Section(section) => {
        let html = render_section(section, show_hero);
        // show hero between sections
        show_hero = true;
        html
      }
      content::PostPart::Quote(quote) => {
        // don't show hero after a quote
        show_hero = false;
        render_quote(&quote)
      }
    });
    html! {{for parts}}
  };

  let keywords = post
    .meta
    .keywords
    .iter()
    .map(|keyword| html! { <span class="tag is-info">{ keyword }</span> });

  html! {
    <>
      <section class="hero is-medium is-light has-background">
        <img alt="The hero's background" class="hero-background is-transparent" src={post.meta.image_url.clone()} />
        <div class="hero-body">
          <div class="container">
            <h1 class="title">
              { &post.meta.title }
            </h1>
            <h2 class="subtitle">
              { "by " }
              <Link<Route> classes={classes!("has-text-weight-semibold")} to={Route::Author { id: post.meta.author.seed }}>
                { &post.meta.author.name }
              </Link<Route>>
            </h2>
            <div class="tags">
              { for keywords }
            </div>
          </div>
        </div>
      </section>
      <div class="section container">
        { view_content }
      </div>
    </>
  }
}