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

use colored::Colorize;
use pandoc::{PandocError, PandocOutput};
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-PW2",
            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.",
        },
        CfgField::Default {
            key: "eta",
            default: "no ETA, program never ran",
            description: "ETA message for estimating time the program takes"
        }
    ],
};

pub struct Mediawiki {
    server_url: String,
    http_user: String,
    http_password: String,
    api_user: String,
    api_secret: String,
    is_dry_run: bool,
    login_token: String,
    csrf_token: String,
    client: Client,
}

impl std::fmt::Debug for Mediawiki {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("Mediawiki")
            .field("server_url", &self.server_url)
            .field("http_user", &self.http_user)
            .field("http_password", &"*****")
            .field("is_dry_run", &self.is_dry_run)
            .field("client", &self.client)
            .finish()
    }
}

pub enum RequestType {
    Get,
    Post,
    PostForEditing
}

impl Mediawiki {
    pub fn new(
        server_url: &str, http_auth_user: &str, http_auth_password: &str, api_user: &str, api_secret: &str, is_dry_run: bool,
    ) -> Self {
        Self {
            server_url: server_url.to_string(),
            http_user: http_auth_user.to_string(),
            http_password: http_auth_password.to_string(),
            api_user: api_user.to_string(),
            api_secret: api_secret.to_string(),
            is_dry_run,
            login_token: String::new(),
            csrf_token: String::new(),
            client: Client::builder().cookie_store(true).build().unwrap(),
        }
    }
    pub fn get_login_token(&self) -> Result<String, Box<dyn Error>> {
        let url =
            format!("{}/api.php?", self.server_url);
        let params: Box<[(&str, &str)]> = Box::from( [
            ("format", "json"),
            ("meta", "tokens"),
            ("type", "login"),
            ("action", "query")
        ]);
        let resp =  self.make_request(url, params, RequestType::Get).unwrap();
        let response_deserialized: QueryResponseLogin = serde_json::from_str(&resp)?;
        Ok(response_deserialized.query.tokens.logintoken)
    }
    pub fn login (&self) -> Result<String, Box<dyn Error>> {
        let url = format!("{}/api.php?", self.server_url);
        let params: Box<[(&str, &str)]> = Box::from([
            ("lgname", self.api_user.as_str()),
            ("lgpassword", self.api_secret.as_str()),
            ("lgtoken", &self.login_token),
            ("action", "login")
        ]);
        let resp: Result<String, Box<dyn Error>> =  self.make_request(url, params, RequestType::Post);
        Ok(resp.unwrap())
    }
    pub fn get_csrf_token(&self) -> Result<String, Box<dyn Error>> { // HAS TO BE FIXED
        let url =
            format!("{}/api.php?", self.server_url);
        let params: Box<[(&str, &str)]> = Box::from([
            ("format", "json"),
            ("meta", "tokens"),
            ("formatversion", "2"),
            ("action", "query")
        ]);
        let resp: Result<String, Box<dyn Error>> =  self.make_request(url, params, RequestType::Get);
        let resp = resp.unwrap();
        let response_deserialized: QueryResponseCsrf = serde_json::from_str(&resp)?;
        Ok(response_deserialized.query.tokens.csrftoken)
    }

    pub fn make_request(&self, url: String, params: Box<[(&str, &str)]>, request_type: RequestType) -> Result<String, Box<dyn Error>> {
        let resp: Result<String, Box<dyn Error>> =  match
            match request_type {
                RequestType::Get => {
                    self
                        .client
                        .get(url)
                        //.basic_auth(&self.http_user, Some(&self.http_password)) ZU TESTZWECKEN ENTFERNT
                        .query(&params)
                        .send()
                }
                RequestType::Post | RequestType::PostForEditing => {
                    self
                        .client
                        .post(url)
                        //.basic_auth(&self.http_user, Some(&self.http_password)) ZU TESTZWECKEN ENTFERNT
                        .form(&params)
                        .send()
                }
            }
        {
            Ok(response) => {
                if response.status().is_success() {
                    match request_type {
                        RequestType::PostForEditing => Ok(response.text().unwrap()),
                        _ => Ok(response.text().unwrap())
                    }
                }
                else {
                    Err(format!("Failed to connect to wiki server: HTTP status code {}", response.status()).into())
                }
            }
            Err(e) => {
                if e.is_connect() {
                    Err(format!("Failed to connect to wiki server. Please check your internet connection or the server URL.\n(Error: {})", e).into())
                } else {
                    Err(format!("An error occurred while sending the request to the wiki server: {}", e).into())
                }
            }
        };
        resp
    }
    /// Creates a completely new wiki page with page_content and page_title as inputs
    pub fn new_wiki_page (&self, page_title: &str, page_content: &str) -> Result<String, Box<dyn Error>> {
        // action=edit&format=json&title=Wikipedia:Sandbox&appendtext=Hello&token=sampleCsrfToken123+\
        let url =
            format!("{}/api.php?", self.server_url);
        let params: Box<[(&str, &str)]> = Box::from([
            ("action", "edit"), // Create and edit pages. 
            ("format", "json"),
            ("title", page_title), // Title of the page to edit. Cannot be used together with pageid. 
            ("appendtext", page_content), // Add this text to the end of the page or section. Overrides text.
            ("token", self.csrf_token.as_str()), // A "csrf" token retrieved from action=query&meta=tokens
            ("bot", "true"), // Mark this edit as a bot edit.
        ]);
        self.make_request(url, params, RequestType::Post)
    }
}

#[derive(Deserialize)]
struct QueryResponseLogin {
    batchcomplete: String,
    query: QueryTokensLogin,
}

#[derive(Deserialize)]
struct QueryTokensLogin {
    tokens: TokensLogin,
}

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

#[derive(Deserialize)]
struct QueryResponseCsrf {
    batchcomplete: bool,
    query: crate::mediawiki::QueryTokensCsrf,
}

#[derive(Deserialize)]
struct QueryTokensCsrf {
    tokens: crate::mediawiki::TokensCsrf,
}

#[derive(Deserialize)]
struct TokensCsrf {
    csrftoken: String,
}

pub fn pad_ins_wiki(old_pad_content: String, wiki: &mut Mediawiki) -> Result<(), Box<dyn Error>> {
    // Login to Wiki and get required tokens for logging in and writing
    let auth_result = wiki.get_login_token()?;
    wiki.login_token.clone_from(&auth_result);
    println!("AUTH Success");
    let login_result = wiki.login()?;
    println!("LOGIN Success");
    let csrf_token = wiki.get_csrf_token();
    let csrf_token = csrf_token.unwrap_or_else(|e| {
        println!("Error while trying to get csrf: {:?}", e);
        String::new()
    });
    println!("CSRF Success");
    wiki.csrf_token.clone_from(&csrf_token);
    println!("---AUTH RESULT:---\n{}\n---LOGIN RESULT:---\n{:?}\n---CSRF RESULT:---\n{}\n-----------", auth_result, login_result, csrf_token);

    // Convert to mediawiki and make new page
    let pad_converted = convert_md_to_mediawiki(old_pad_content);
    println!("Das kommt ins Wiki: {}", pad_converted);
    //wiki.new_wiki_page("Page Test 5", &pad_converted)?; JUST AN EXAMPLE

    // 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}")

     */
    Ok(())
}

/// 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)
        .unwrap_or_else(|_| panic!("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!");
    contents
}

/// 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 {
    // TODO: use tempfile="3.3", make it a NamedTempFile::new()?;
    //       or alternatively use piped stdout to avoid files entirely
    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");
    let temp = read_txt_file(output_filepath);
    println!("TEMP: {}", temp.purple());
    temp
}