mod filters;

use std::{path::PathBuf, str::FromStr, sync::LazyLock};

use filters::*;
use tera::{Context, Tera};
use time::OffsetDateTime;
use tokio::time::Instant;
use tokio_stream::{wrappers::ReadDirStream, StreamExt};

use crate::{icon::extract_icon, AResult, FileInfo, BASE_DIR};

pub static TERA: LazyLock<Tera> = LazyLock::new(|| {
    let mut tera = Tera::default();
    tera.add_raw_template(
        "index.html.jinja",
        include_str!("../templates/index.html.jinja"),
    )
    .unwrap();
    tera.add_raw_template(
        "markdown.html.jinja",
        include_str!("../templates/markdown.html.jinja"),
    )
    .unwrap();
    tera.register_filter("iconize", iconize);
    tera.register_filter("from_ico", from_ico);
    tera.register_filter("size", size);
    tera.register_filter("time", time);
    tera.register_filter("md", md);

    tera
});

pub async fn render_index(path: &PathBuf, time: Instant) -> AResult<String> {
    let time2 = Instant::now();
    let base = BASE_DIR.display().to_string();
    let dirname = path
        .display()
        .to_string()
        .replace(&base, "")
        .replace('\\', "/");

    let filename = path.file_name().unwrap().to_string_lossy().to_string();
    let description = PathBuf::from_str(&format!(
        "{}/.{}.info",
        path.parent().unwrap().to_string_lossy(),
        filename
    ))?;
    let description = if description.exists() {
        Some(std::fs::read_to_string(description)?)
    } else {
        None
    };

    let directories = get_directories(path).await?;
    let files = get_files(path).await?;

    let tera = &*TERA;

    let mut context = Context::new();
    context.insert("description", &description);
    context.insert("dirname", &dirname);
    context.insert("directories", &directories);
    context.insert("files", &files);

    let loading = time2.elapsed() + time.elapsed();
    context.insert("loading", &loading.as_millis());
    Ok(tera.render("index.html.jinja", &context)?)
}

pub fn render_markdown(filename: &str, content: &str) -> AResult<String> {
    let tera = &*TERA;

    let mut context = Context::new();
    context.insert("filename", &filename);
    context.insert("content", &content);

    Ok(tera.render("markdown.html.jinja", &context)?)
}

async fn get_directories(path: &PathBuf) -> AResult<Vec<FileInfo>> {
    let mut contents = ReadDirStream::new(tokio::fs::read_dir(&path).await?);

    let mut files = vec![];

    while let Some(file) = contents.next().await {
        let file = file?;
        let metadata = file.metadata().await?;
        if !metadata.is_dir() {
            continue;
        }
        let filename = file.file_name().to_string_lossy().to_string();
        if filename.starts_with('.') {
            continue;
        }

        // let created: OffsetDateTime = metadata.created()?.into();
        let modified: OffsetDateTime = metadata.modified()?.into();

        let description = PathBuf::from_str(&format!(
            "{}/.{}.info",
            file.path().parent().unwrap().to_string_lossy(),
            filename
        ))?;

        let description = if description.exists() {
            Some(std::fs::read_to_string(description)?)
        } else {
            None
        };

        files.push(FileInfo {
            filename,
            format: "DIR".to_string(),
            size: 0,
            icon: None,
            // created,
            modified,
            description,
        });
    }

    Ok(files)
}

async fn get_files(path: &PathBuf) -> AResult<Vec<FileInfo>> {
    let mut contents = ReadDirStream::new(tokio::fs::read_dir(&path).await?);

    let mut files = vec![];

    while let Some(file) = contents.next().await {
        let file = file?;
        let metadata = file.metadata().await?;
        if metadata.is_dir() {
            continue;
        }
        let filename = file.file_name().to_string_lossy().to_string();
        if filename.starts_with('.') {
            continue;
        }
        let format = file_format::FileFormat::from_file(file.path())?;
        let format = format.media_type();

        let icon = if format == "application/x-dosexec" {
            // ..
            extract_icon(&file.path()).ok().flatten()
        } else {
            None
        };

        // let created: OffsetDateTime = metadata.created()?.into();
        let modified: OffsetDateTime = metadata.modified()?.into();

        let description = PathBuf::from_str(&format!(
            "{}/.{}.info",
            file.path().parent().unwrap().to_string_lossy(),
            filename
        ))?;

        let description = if description.exists() {
            Some(std::fs::read_to_string(description)?)
        } else {
            None
        };

        files.push(FileInfo {
            filename,
            format: format.to_string(),
            size: metadata.len() as usize,
            icon,
            // created,
            modified,
            description,
        });
    }

    Ok(files)
}