use markdown::{to_html_with_options, CompileOptions, Options};
use regex::Regex;
use std::collections::HashMap;
use std::{env, fs::read_to_string};
use tera::{Context, Tera};
fn main() {
    let args: Vec<String> = env::args().collect();
    if args.len() < 2 {
        panic!("Please provide md file");
    }

    let markdown = read_to_string(args.get(1).unwrap()).expect("File does not exist");

    println!("{}", generate_blog_entry(markdown));
}

fn generate_blog_entry(markdown: String) -> String {
    let markdown = markdown.clone();

    let mut tera = Tera::new("templates/*").unwrap();
    tera.autoescape_on(vec![]);

    let (mut key_value, markdown) = get_kv(markdown);

    let html_markdown = to_html_with_options(
        &markdown,
        &Options {
            compile: CompileOptions {
                allow_dangerous_html: true,
                allow_dangerous_protocol: true,
                ..CompileOptions::default()
            },
            ..Options::default()
        },
    )
    .unwrap();

    key_value.insert("blog_content".to_string(), html_markdown);

    let context = Context::from_serialize(&key_value).unwrap();

    tera.render(key_value.get("template").unwrap(), &context)
        .unwrap()
}

fn get_kv(markdown: String) -> (HashMap<String, String>, String) {
    let re_key_value = Regex::new(r"(?ms)---(.*)---(?:\n)").unwrap();

    let key_value_string = re_key_value
        .find(markdown.as_str())
        .expect("Can't find key value map in markdown");

    let content_markdown = re_key_value
        .replace(markdown.clone().as_str(), "")
        .to_string();

    let mut key_value: HashMap<String, String> = HashMap::new();

    for line in key_value_string.as_str().lines() {
        if line == "---" {
            continue;
        }
        key_value.insert(
            line.split(':')
                .collect::<Vec<&str>>().first()
                .unwrap()
                .trim()
                .to_string(),
            line.split(':')
                .collect::<Vec<&str>>()
                .get(1)
                .unwrap()
                .trim()
                .to_string(),
        );
    }

    (key_value, content_markdown)
}