use std::error::Error;
use std::fs::File;
use std::io::Read;

use pandoc::{PandocError, PandocOutput};
use reqwest;
use reqwest::blocking::Client;
use serde::Deserialize;

use crate::config_spec::{CfgField, CfgGroup};

pub const CONFIG: CfgGroup<'static> = CfgGroup {
    name: "wiki",
    description: "API Settings for Mediawiki",
    fields: &[
        CfgField::Default {
            key: "server-url",
            default: "https://wiki.berlin.ccc.de/",
            description: "Server running the wiki.",
        },
        CfgField::Default {
            key: "http-user",
            default: "cccb-wiki",
            description: "HTTP basic auth user name.",
        },
        CfgField::Password { key: "http-password", description: "HTTP basic auth password." },
        CfgField::Default {
            key: "api-user",
            default: "PlenumBot@PlenumBot-PW1",
            description: "API Username associated with the bot account used for edits.",
        },
        CfgField::Password {
            key: "api-secret",
            description: "API secret / \"password\" used for authenticating as the bot.",
        },
    ],
};

#[derive(Deserialize)]
struct QueryResponse {
    batchcomplete: String,
    query: QueryTokens,
}

#[derive(Deserialize)]
struct QueryTokens {
    tokens: Tokens,
}

#[derive(Deserialize)]
struct Tokens {
    logintoken: String,
}

pub fn pad_ins_wiki(old_pad_content: String) {
    convert_md_to_mediawiki(old_pad_content);
    // Textdatei wieder einlesen


    // Passwörter aus Datenbank lesen (ToBeDone)
    /*
    let plenum_bot_user = String::from("PlenumBot@PlenumBot-PW1");
    let plenum_bot_pw = String::from("**OLD_API_PW_REMOVED**");
    let login_token = login_to_mediawiki(plenum_bot_user.clone(), plenum_bot_pw.clone())
        .expect("Fehler beim Einloggen!");
    println!("plenum_bot_user: {plenum_bot_user}, plenum_bot_pw: {plenum_bot_pw}, login_token: {login_token}")

     */
}

/// Converts one file type into another using pandoc and saves the result as a txt file
fn pandoc_convert(old_pad_content: String, output_filepath: &str, input_format: pandoc::InputFormat, output_format: pandoc::OutputFormat) -> Result<PandocOutput, PandocError> {
    //Convert Markdown into Mediawiki
    // Vanilla pandoc Befehl: pandoc --from markdown --to mediawiki --no-highlight
    let mut p = pandoc::new();
    p.set_input(pandoc::InputKind::Pipe(old_pad_content));
    p.set_input_format(input_format, vec![]);
    p.set_output(pandoc::OutputKind::File(output_filepath.parse().unwrap()));
    p.set_output_format(output_format, vec![]);
    p.execute()
}

/// Reads a text file from a specified path and returns it as a String
fn read_txt_file (filepath: &str) -> String {
    let mut file =
        File::open(filepath).expect(&*format!("Fehler beim öffnen der Textdatei mit Pfad {filepath}!"));
    let mut contents = String::new();
    file.read_to_string(&mut contents).expect("Fehler beim auslesen der MediaWiki-Textdatei!").to_string()
}

/// Takes a Sting in the Markdown format and returns a String in the mediawiki Format
fn convert_md_to_mediawiki (old_pad_content: String) -> String {
    let output_filepath: &str = "./pandoc_mediawiki.txt";
    pandoc_convert(old_pad_content, output_filepath, pandoc::InputFormat::Markdown, pandoc::OutputFormat::MediaWiki).expect("Fehler beim Umwandeln des und speichern des Pads in eine mediawiki-Textdatei");
    read_txt_file(output_filepath)
}

/// Authenticate with username and password on http basic auth 
pub fn get_login_token(client: &Client, http_user: &str, http_pass: &String) -> Result<String, Box<dyn Error>> {
    let resp = client
        .get("https://wiki.berlin.ccc.de/api.php?action=query&meta=tokens&type=login&format=json")
        .basic_auth(http_user, Some(http_pass))
        .send()?
        .text()?;
    let response_deserialized: QueryResponse = serde_json::from_str(&resp)?;
    Ok(response_deserialized.query.tokens.logintoken)
}