use anyhow::{Context, Result};
use maud::{html, Markup};
use serde::Deserialize;
use toml::value::Date;

use self::page::Page;

mod page;

#[derive(Deserialize)]
struct Data {
    stories: Vec<Story>,
}

impl page::Page for Data {
    fn page_title() -> String {
        String::from("Home")
    }

    fn alternative_htmlfilename() -> Option<String> {
        Some(String::from("index"))
    }

    fn render_content(&self) -> Markup {
        let last_story = self.stories.first();
        html!(
            @if let Some(story) = last_story {
                div class="latest-story" lang=(story.html_lang_value()) {
                    h2 lang="en" { "Latest Story" }
                    h3 {
                        (story.name)
                    }
                    @if let Some(content_warnings) = story.render_content_warnings() {
                        (content_warnings)
                    }

                    p { (story.description) }
                    ul lang="en" {
                        li { "Language: " (story.language) }
                        li {
                            a href=(&story.format_pdf_path()) download
                            {
                                "PDF"
                            }
                        }
                    }

                }
            }
        )
    }

    fn content_style() -> Markup {
        html!(
        """
h2 {
    font-size: 2.5rem;
    color: #2F3C57;
    text-decoration: 0.1rem solid underline black;
}

h3 {
    font-size: 1.8rem;
    color: #2F3C57;
    padding: 2rem 0;
}

.latest-story {
    padding: 3rem;
    margin: 3rem;
    text-align: left;
    background-color: #FFD1A3;
    hyphens: auto;
    * {
        margin: 1rem 0;
    }

    p {
        font-size: 1.2rem;
    }
}

a {
    text-decoration: underline;
    color: #3D1D49;
}

ul {
    list-style: none;
}

.content-warning {
    background-color: #EC7981;
    margin: 2rem 0;
    padding: 0.3rem;
    width: fit-content;
}

        """
        )
    }
}

impl page::Page for Vec<Story> {
    fn page_title() -> String {
        String::from("Stories")
    }

    fn render_content(&self) -> Markup {
        html!(
            @for story in self {
                (story.render_as_card())
            }
        )
    }

    fn prepare_content(&mut self) -> Result<()> {
        self.sort_by(|a, b| {
            let date1 = a.update_date.unwrap_or(a.upload_date);
            let date2 = b.update_date.unwrap_or(b.upload_date);
            date2.cmp(&date1)
        });
        for story in self {
            std::fs::copy(&story.path, story.format_local_pdf_path())?;
        }
        Ok(())
    }

    fn content_style() -> Markup {
        html!(
        """
h2 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    color: #2F3C57;
}

hr {
    margin: 1rem;
}


.story-card {
    text-align: left;
    font-size: 1.2rem;
    hyphens: auto;
    ul {
        display: flex;
        justify-content: start;
        list-style: none;
        flex-wrap: wrap;
        
        li {
            font-size: 1rem;
            padding: 0.8rem;
            margin: 0.8rem;
            background-color: #2F3C57;
            color: #ffd1a3;
            outline: 0.2rem solid #2F3C57;
            
            a {
                text-decoration: underline #E1CCEB;
                color: #E1CCEB;
            }
        }
    }

    hr {
        margin: 2rem 0;
    }

    p {
        margin-top: 1rem;
    }

    padding: 3rem;
    margin: 3rem;
    background-color: #ffd1a3;
    border-bottom: 0.1rem dotted black;

    .content-warning {
        background-color: #EC7981;
        margin: 2rem 0;
        padding: 0.3rem;
        width: fit-content;
    }
}
        """
        )
    }
}

#[derive(Deserialize, Debug)]
enum StoryLanguage {
    German,
    English,
}

impl std::fmt::Display for StoryLanguage {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{:?}", self)
    }
}

#[derive(Deserialize)]
struct Story {
    name: String,
    description: String,
    language: StoryLanguage,
    upload_date: Date,
    update_date: Option<Date>,
    path: String,
    warnings: Option<Vec<String>>,
}

impl Story {
    fn render_as_card(&self) -> Markup {
        html!(div class="story-card" lang=(self.html_lang_value()) {
            card {
                h2 { (self.name) }
                @if let Some(content_warnings) = &self.render_content_warnings() {
                    (content_warnings)
                }
                p { (self.description) }
                hr {}
                ul lang="en" {
                    li { "Language: " (self.language) }
                    li { "Uploaded on: " (self.upload_date) }
                    @if let Some(update_date) = self.update_date {
                        li { "Updated on: " (update_date) }
                    }
                    li {
                        a href=(&self.format_pdf_path()) download
                        {
                            "PDF"
                        }
                    }
                }
            }
        })
    }

    fn format_pdf_path(&self) -> String {
        let snake_case_name = self.name.to_lowercase().replace(" ", "_");
        format!("stories/{}.pdf", snake_case_name)
    }

    fn format_local_pdf_path(&self) -> String {
        format!("dist/{}", self.format_pdf_path())
    }

    fn html_lang_value(&self) -> String {
        match self.language {
            StoryLanguage::German => String::from("de"),
            StoryLanguage::English => String::from("en"),
        }
    }

    fn render_content_warnings(&self) -> Option<Markup> {
        if let Some(warnings) = &self.warnings {
            let (summary, prefix) = match self.language {
                StoryLanguage::German => (
                    String::from("Vorsicht ist geboten."),
                    String::from("Die Geschichte beinhaltet: "),
                ),
                StoryLanguage::English => (
                    String::from("Reader discretion is advised."),
                    String::from("The story contains: "),
                ),
            };
            let details = format!("{}{}", prefix, warnings.join(", "));
            Some(html!(
                details {
                    summary {
                        strong { (summary) }
                    }
                    p class="content-warning" { (details) }
                }
            ))
        } else {
            None
        }
    }
}

fn main() -> Result<()> {
    let data_file_content =
        std::fs::read_to_string("data.toml").with_context(|| "Failed to read data.toml")?;
    let mut data: Data = toml::from_str(&data_file_content)?;
    data.stories.write_page()?;
    data.write_page()?;
    Ok(())
}