use std::io;
use std::fs;
use std::path::Path;
use std::env;
use walkdir::WalkDir;
use std::process::Command;
use std::ffi::OsStr;
use colorize::AnsiColor;
use dirs;
use pandoc::PandocError;
use dokugile::template;
use rust_i18n::t;
use include_dir::{include_dir, Dir};

rust_i18n::i18n!("locales");

struct Project {
    wiki_path: String,
    doc_path: String,
    doc_title: String,
    output_dir: String,
}

impl Project {
    fn new(wiki_path: String, doc_path: String, doc_title:String, output_dir: String) -> Project {
        Project {
            wiki_path,
            doc_path,
            doc_title,
            output_dir,
        }
    }
}

fn main() {
    const NAME: &str = env!("CARGO_PKG_NAME");
    const VERSION: &str = env!("CARGO_PKG_VERSION");
    const REPO: &str = env!("CARGO_PKG_REPOSITORY");
    println!("{} {}\n{}\n",NAME.b_magenta(), VERSION.b_magenta(), REPO.b_blue());

    static ASSETS_DIR: Dir<'_> = include_dir!("$CARGO_MANIFEST_DIR/assets");
    let _ = set_lang();
    let mut wiki_path = String::new();
    let mut doc_path = String::new();
    let mut doc_title = String::new();
    let mut output_dir = String::new();
    let mut attempts: i8 = 0;

    while !Path::new(&doc_path).exists() || doc_title.trim().is_empty(){
        doc_path = String::new();
        let mut input = String::new();
        println!("{}:", t!("Project name"));
        io::stdin().read_line(&mut input).expect(&t!("Failed to read line")); 
        let root = env::var("HOME").unwrap().to_string()+"/";
        let user_documents_path = dirs::document_dir().unwrap().display().to_string();
        let user_doc_dir = user_documents_path.split("/").collect::<Vec<_>>().last().unwrap().to_string();

        while !Path::new(&wiki_path).exists() {
            let mut project_dir = String::new();
            println!("{}:[{}/Wiki] ", t!("Project location"), &user_doc_dir);
            io::stdin().read_line(&mut project_dir).expect(&t!("Failed to read line"));
            if project_dir.trim().is_empty() { project_dir = String::from(user_doc_dir.clone()+"/Wiki") };
            wiki_path = root.clone()+project_dir.trim();
            
            if !Path::new(&wiki_path).exists(){
                let mut ans = String::new();
                println!("{}", t!("Do you want to create a new location called %{s} for the documents?(y/n)[Y]", s = &project_dir.trim().to_owned().green().bold()));
                io::stdin().read_line(&mut ans).expect("Failed to read line");
                if ans.trim().is_empty() { ans = String::from("Y") };
                match ans.trim() {
                    "y" | "yes" | "Y" | "B" | "Bai" => { //let _ = fs::create_dir(&wiki_path);
                        let _ = mkdir(&wiki_path);
                        println!("{}.", t!("Location %{s} has been created", s = &project_dir.trim().to_owned().green().bold()));
                    },
                    _ => continue,
                };
            }
        }

        if input.trim().is_empty(){
            attempts += 1;
        }
        if attempts == 3 {
            break
        };

        doc_title = input.to_string();
        output_dir = input.trim_end().to_owned()+"_html";
        doc_path.push_str(&wiki_path);
        doc_path.push_str("/");
        doc_path.push_str(&doc_title.trim_end());
        //doc_path.push_str(&capitalize_first_letter(&doc_title.trim_end()));
        let res_path = wiki_path.clone()+"/res";
        if !Path::new(&doc_path).exists() || !Path::new(&res_path).exists(){
            // extract assets to temporary directory
            let  _ = ASSETS_DIR.extract("/tmp/assets");
            let mut ans = String::new();
            if !Path::new(&doc_path).exists() {
                println!("{}", t!("The project %{s} has not been found. Do you want to create it?(y/n)[Y]", s = &input.trim().to_owned().green().bold()));
                io::stdin().read_line(&mut ans).expect(&t!("Failed to read line"));
            }
            if ans.trim().is_empty() { ans = String::from("Y") };
            match ans.trim() {
                "y" | "yes" | "Y" | "B" | "Bai" => {
                    let _ = mkdir(&doc_path);
                    // create resources
                    for entry in WalkDir::new("/tmp/assets").into_iter().filter_map(|e| e.ok()) {
                        let input_entry = String::from(entry.path().strip_prefix("/tmp/assets").expect(&t!("Path not found")).display().to_string());
                        let subdirs = wiki_path.to_string()+"/"+&input_entry;
                        let images = wiki_path.to_string()+"/"+&doc_title.trim()+"/"+&input_entry;

                        if entry.path().is_dir(){ 
                            match Path::new(&input_entry).to_str() {
                                Some("images") => { //create images directory
                                    let _ = mkdir(&images);
                                },
                                Some(..) => { //create resources and its subdirectories
                                    let _ = mkdir(&subdirs);
                                },
                                _ => continue
                            };
                        }else if entry.path().is_file(){
                            let source = String::from(entry.path().display().to_string());
                            match Path::new(&input_entry).to_str() {
                                Some(d) if d.contains("images/")=>{ //copy sample-image to images folder
                                    let _ = copy(&source, &images);
                                },
                                Some(..) => { //copy files from all other directories
                                    let _ = copy(&source, &subdirs);
                                },
                                _ => continue
                            };
                        }
                    }
                    println!("{}.", t!("Project %{s} has been created. Now you can edit index.md file and create content", s = &input.trim().to_owned().green().bold()));
                    //remove temporary created assets directory
                    let _ = fs::remove_dir_all(Path::new("/tmp/assets"));
                },
                _ => continue,
            }; 
        }

        let index = doc_path.to_string()+"/index.md";
        if !Path::new(&index).exists(){
            let _ = touch(&index, &template());
        };
    }

    let res = processing(Project::new(wiki_path.clone(), doc_path.clone(), doc_title, output_dir));
    match res {
        Err(e) => println!("{}", t!("The operation failed with error %{s}", s = e)),
        Ok(e) => println!("{}", e)
    };
}

fn mkdir(dir: &String) -> std::io::Result<()>{
    let _ = fs::create_dir(dir)?;
    Ok(())
}

fn touch(file: &String, content: &String) -> std::io::Result<()>{
    fs::write(file, content)?;
    Ok(())
}

fn copy(source: &String, dest: &String) -> std::io::Result<()> {
    fs::copy(source, dest)?;
    Ok(())
}
/*
fn capitalize_first_letter(s: &str) -> String {
    s[0..1].to_uppercase() + &s[1..]
}
*/

fn processing(project: Project) -> Result<String, String>{
    let mut md_count :i32 = 0;
    let mut error = String::new();
    for entry in WalkDir::new(&project.doc_path).into_iter().filter_map(|e| e.ok()) {
        if entry.path().is_dir(){
            let input_entry = String::from(entry.path().display().to_string());
            let doc_title: String = "/".to_string()+&project.doc_title.trim_end();
            let output_dir: String = "/".to_string()+ &project.output_dir.trim_end();
            //replace project-directory to project-directory_html(e.g. "Test" to "Test_html")
            let new_entry = input_entry.replace(&doc_title, &output_dir);
            //create output _html directory and subdirectories except images dir
            match &entry.path().file_name() {
                Some(p) if *p != "images"=> {
                    let _ = mkdir(&new_entry);
                },
                _ => continue,
            };
        }else if entry.path().is_file(){
            if let Some(extension) = entry.path().extension().and_then(OsStr::to_str) {
                //filter md files
                match extension {
                    "md" => {
                        //md_count += 1;
                        println!("{}", t!("found... %{s}", s = entry.path().display()));
                        let conv = md_to_html(entry.path(), &project.doc_title, &project.output_dir, &project.wiki_path);
                        match conv {
                            Ok(()) => md_count += 1,
                            Err(e) => { //println!("{}", e);
                                        error = e.to_string();
                                        break;
                            },
                        };
                    },
                    _ => (),
                };
            };
        };
    };

    if error.is_empty() {
        if md_count == 0 {
            println!("{}", t!("No markdown files found!"));
            println!("{}", t!("Pleade edit first your documents in markdown format and come back to convert them to html. Bye!"));
        }else{
            println!("{}", t!("Processed markdown files.. %{s}", s = md_count));
        }
        let mut index = project.wiki_path.to_owned()+"/"+&project.output_dir.trim_end();
        index.push_str("/index.html");
        sanitize(Path::new(&index));
        //Ok("Success")
        let link = String::from("file://".to_owned()+&index).b_blue();
        let message:String = String::from(t!("Congrats! Check your documentation at.. %{s}", s = &link));
        Ok(message)
    }else{
        //Err(std::stringify!(error))
        Err(error)
    }
}

fn md_to_html(input_file: &Path, doc_title: &String, output_dir: &String, wiki_path: &String) -> Result<(), PandocError>{
    let page_title: String = "pagetitle=".to_string()+*&doc_title.trim_end();
    let doc_title: String = "/".to_string()+*&doc_title.trim_end();
    let output_dir: String = "/".to_string()+ *&output_dir.trim_end();
    let output_file = input_file.display().to_string().replace(&doc_title, &output_dir).replace(".md", ".html");
    let base_path = wiki_path.to_owned()+&doc_title;
    let res_path = wiki_path.to_owned()+&"/res:".to_string();
    let mut pandoc = pandoc::new();
    pandoc.add_input(&input_file);
    pandoc.arg("resource-path", &res_path); //for css and javascript resources
    pandoc.arg("resource-path", &base_path); //for image search
    pandoc.arg("include-after-body", "buttons.html");
    pandoc.arg("css", "css/theme.css");
    pandoc.arg("css", "css/sidebar.css");
    pandoc.arg("css", "css/buttons.css");
    pandoc.arg("embed-resources", "true");
    pandoc.arg("standalone", "true");
    pandoc.arg("shift-heading-level-by", "-1");
    pandoc.set_number_sections();
    pandoc.set_toc();
    pandoc.arg("toc-depth", "4");
    pandoc.arg("metadata", &page_title);
    pandoc.set_output(pandoc::OutputKind::File(output_file.into()));
    //pandoc.execute().unwrap();

    match pandoc.execute() {
        Ok(..) => Ok(()),
        Err(PandocError::PandocNotFound) => Err(PandocError::PandocNotFound),
        Err(PandocError::IoErr(e)) => Err(PandocError::IoErr(e)),
        Err(PandocError::Err(e)) => Err(PandocError::Err(e)),
        Err(PandocError::NoInputSpecified) => Err(PandocError::NoInputSpecified),
        Err(PandocError::BadUtf8Conversion(e)) => Err(PandocError::BadUtf8Conversion(e)),
        Err(PandocError::NoOutputSpecified) => Err(PandocError::NoOutputSpecified)
    }
}

fn sanitize(index: &Path){
    if index.exists(){
        //convert page links from ".md" to ".html" in the index.html file
        Command::new("sed")
        .args(["-i", r"-e s/\.md/\.html/g", &index.display().to_string()])
        .status()
        .expect(&t!("sed command failed start"));
    }else{
        println!("{}", t!("Please consider renaming your main page to index.md and restart the document conversion again. See you later!"));
    };
}

fn set_lang(){
    let default = String::from("en_US"); // default locale
    let locales = rust_i18n::available_locales!(); // available locales
    let lang:String = match env::var("LANG") { // find out user's lang
        Ok(val) => match val {
            v if !v.is_empty() && locales.iter().any(|e| v.contains(e)) => v[..5].to_string(),
            _ => default
        } ,
        Err(..) => default,
    };
    rust_i18n::set_locale(&lang); // set user lang    
}