use clap::{Parser, Subcommand};
use itertools::Itertools;
use log::{debug, error, info};
use serde::{Serialize, Deserialize};
use std::env;
use std::fs;
use std::io::Read;
use std::io::Write;
use std::process::Stdio;
use std::{process, collections::HashMap};

use crate::bitwarden_api::model;

mod bitwarden_api;

// GOALS:
// * `search` item via dmenu / rofi / cli
// * `search --mark` parameter that remembers the marked entry
// * `mark get {field}` returns the field of the marked element (id, title, folder, username, password, etc)
// * "scroll" through marked history, mark as active again
// * automatically execute `export BW_SESSION="$(bw unlock --raw)" && bw serve --hostname 127.0.0.1&` if required
// * unlock with system keyring if possible
// * autotype?


#[derive(Parser)]
#[command(author, version, about, long_about = None)] // Read from `Cargo.toml`
struct Cli {
    #[command(subcommand)]
    command: CliCommands,
}

#[derive(Subcommand)]
enum CliCommands {
    // Show the details of the item
    Select {
        title: Option<String>,
    },
}

#[derive(Serialize, Deserialize)]
struct History {
    history: Vec<String>,
}


fn main() {
    env_logger::init();

    let cli = Cli::parse();
    match &cli.command {
        CliCommands::Select{title: _} => {
            // the title is always ignored, we want the id which we get via the environment variables
            debug!("Running in select mode");
            rofi();
        }
    }
}


fn get_history() -> Vec<String> {
    let file_path = "/tmp/bw-menu-history.json"; // TODO: use XDG paths

    let read_file = fs::OpenOptions::new()
        .read(true)
        .open(file_path);

    let json_str = match read_file {
        Ok(mut file) => {
            let mut content = String::new();
            file.read_to_string(&mut content).expect("Failed to read file");
            content
        }
        Err(_) => String::new(), // Return an empty string if the file cannot be opened
    };

    // Deserialize JSON string back into a Rust struct
    let history: History = serde_json::from_str(&json_str).unwrap_or_else(|_| {
        // Return a default Person with an empty history if deserialization fails
        History {
            history: Vec::new(),
        }
    });

    history.history
}


fn save_history(entries: Vec<String>) {
    let history = History {
        history: entries,
    };
    let json_str = serde_json::to_string(&history).expect("Failed to serialize to JSON!");

    let file_path = "/tmp/bw-menu-history.json"; // TODO: use XDG paths

    // Write the JSON string to a file, overwriting it if it already exists
    let mut file = fs::OpenOptions::new()
        .write(true)
        .truncate(true) // Ensure the file is truncated before writing
        .create(true)
        .open(file_path)
        .expect("Failed to open file for writing!");

    file.write_all(json_str.as_bytes()).expect("Failed to write to file!");
}

const MAX_HISTORY_LEN: usize = 5; // TODO: make configurable
fn add_history(entry: &String) {
    let mut history = get_history();
    history.insert(0, entry.to_string());
    if history.len() > MAX_HISTORY_LEN {
        history = history[0..MAX_HISTORY_LEN].to_vec();
    }
    save_history(history);
}


// the flow is:
// 1. bw-menu starts rofi in the script mode
// 2. rofi calls bw-menu calls bw-menu to get a list of items to display
// 3. the user interacts with the list
// 4. rofi sets environment variables, and calls bw-menu with the title of the selected item
// 5. bw-menu acts based on the environment variables
//
// currently using the script mode so that we can pass additional info (eg the id).
// no other mode supports this, meaning we would need to match based on the title
fn rofi() {
    let rofi_retv = env::var("ROFI_RETV");
    let rofi_info = env::var("ROFI_INFO");
    dbg!(&rofi_retv);
    dbg!(&rofi_info);

    match rofi_retv {
        Err(_) => {
            // this means rofi is not running yet, so let's start it
            debug!("starting initial rofi process");
            let _ = process::Command::new("rofi")
                .arg("-show")
                .arg("bw")
                .arg("-modes")
                .arg("bw:./target/debug/bw-menu select") // todo: set the path according to argv[0]
                // we need to remap some default so that we can use the keys for custom binds
                .arg("-kb-accept-alt")
                .arg("F12")
                .arg("-kb-accept-custom")
                .arg("F11")
                // set our custom keybinds
                .arg("-kb-custom-1")
                .arg("Shift+Return")
                .arg("-kb-custom-2")
                .arg("Control+Return")
                .spawn()
                .expect("Failed to spawn child process"); // TODO: better error handling
        }
        Ok(_) => {
            // this means we are being called by rofi as a custom script
            // either generate the list, or act on input
            let rofi_retv = rofi_retv.unwrap_or_default().to_string().parse::<i32>().unwrap_or(0);
            let rofi_info = rofi_info.unwrap_or_default();

            if rofi_retv == 0 {
                // 0: Initial call of script
                generate_rofi_list(get_bitwarden_logins());
            } else {
                let item = match crate::bitwarden_api::object_item(&rofi_info) {
                    Ok(response) => response,
                    Err(msg) => {
                        error!("Failed to get Bitwarden item with id {}:\n{}", rofi_info, msg);
                        process::exit(1);
                    }
                };
                add_history(&rofi_info);
                // 1: Selected an entry
                if rofi_retv == 1 {
                    info!("copy password");
                    if let Some(login) = item.data.login {
                        if let Some(password) = login.password {
                            save_to_clipboard(password);
                        }
                    }
                // 10-28: Custom keybinding 1-19
                } else if rofi_retv == 10 {
                    info!("copy username");
                    if let Some(login) = item.data.login {
                        if let Some(username) = login.username {
                            save_to_clipboard(username);
                        }
                    }
                } else if rofi_retv == 11 {
                    info!("show item");
                    println!("\0prompt\x1fSelect field");
                    println!("\0message\x1fReturn | Copy field");
                    println!("{}\0icon\x1f{}\x1finfo\x1f{}", "TODO", "folder", "single-item:todo");
                    // TODO: not sure how to proceed here. currently pressing return leads to the "copy password" action
                    // one option is to pass the action in the info and parsing that

                    // if let Some(login) = item.data.login {
                    //     if let Some(username) = login.username {
                    //         println!("Username: {}", username);
                    //     }
                    // }
                }
                // we are done here
                process::exit(0);
            }
        }
    }
}

fn get_bitwarden_logins() -> HashMap<String, model::response::ListObjectItemsDataData> {
    match crate::bitwarden_api::status() {
        Ok(response) => {
            if response.data.template.status != "unlocked" {
                error!("Vault is {}, should be unlocked!", response.data.template.status);
                process::exit(1);
            }
        }
        Err(msg) => {
            error!("Failed to get Bitwarden status:\n{msg}");
            process::exit(1);
        }
    }

    match crate::bitwarden_api::sync() {
        Ok(_) => info!("Sync'd Bitwarden Vault."),
        Err(msg) => {
            error!("Failed to sync Bitwarden Vault:\n{msg}");
            process::exit(1);
        }
    }

    let items = match crate::bitwarden_api::list_object_items() {
        Ok(response) => {
            info!("Got list of Bitwarden items.");
            response.data.data
        }
        Err(msg) => {
            error!("Failed to get list of Bitwarden items:\n{msg}");
            process::exit(1);
        }
    };

    let collections: HashMap<String, String> = match crate::bitwarden_api::list_object_collections() {
        Ok(response) => {
            info!("Got list of Bitwarden collections.");
            response.data.data.iter()
                .map(|item| (item.id.clone(), item.name.clone()))
                .collect()
        }
        Err(msg) => {
            error!("Failed to get list of Bitwarden collections:\n{msg}");
            process::exit(1);
        }
    };

    let folders: HashMap<String, String> = match crate::bitwarden_api::list_object_folders() {
        Ok(response) => {
            info!("Got list of Bitwarden folders.");
            response.data.data.iter()
                .filter(|item| item.id.is_some())
                .map(|item| (item.id.as_ref().unwrap().clone(), item.name.clone()))
                .collect()
        }
        Err(msg) => {
            error!("Failed to get list of Bitwarden folders:\n{msg}");
            process::exit(1);
        }
    };

    let mut logins: HashMap<String, model::response::ListObjectItemsDataData> = HashMap::new();
    for item in items {
        if item.login.is_some() {
            let title = get_title(&item, &folders, &collections);
            debug!("Login: {}", title);
            logins.insert(title, item);
        }
        // break;
    }
    // dbg!(&logins);
    logins
}


fn generate_rofi_list(logins: HashMap<String, model::response::ListObjectItemsDataData>) {
    println!("\0prompt\x1fSelect item");
    println!("\0message\x1fReturn | Copy password\rShift+Return | Copy username or selected field\rControl+Return | Show item");
    println!("\0use-hot-keys\x1ftrue");
    println!("\0no-custom\x1ftrue");
    println!("\0markup-rows\x1ftrue");

    for title in logins.keys().sorted() {
        print!("{title}");
        let icon = "folder"; // TODO: what icons are available? ~/.icons seems to work
        println!("\0icon\x1f{}\x1finfo\x1f{}", icon, logins[title].id);
    }
}


fn get_title(item: &model::response::ListObjectItemsDataData, folders: &HashMap<String, String>, collections: &HashMap<String, String>) -> String {
    let mut title = String::new();
    let login = item.login.as_ref().unwrap();

    if item.folderId.is_some() {
        title.push_str(&format!("{}/", folders[item.folderId.as_ref().unwrap()]));
    }

    // TODO: how do we handle multiple collections nicely? i dont like the pipe for searching. my
    // fav solution right now is to display the entry multiple times, eg "000/000-p-xca01", "001/000-p-xca01"
    for collection_id in &item.collectionIds {
        title.push_str(&collections[collection_id]);
    }
    if !item.collectionIds.is_empty() {
        title.push('/');
    }

    if title.is_empty() {
        title.push_str("ungrouped/");
    }

    title.push_str(&item.name);

    if login.username.is_some() {
        title.push_str(&format!(" ({})", login.username.as_ref().unwrap()));
    }

    title
}


fn save_to_clipboard(input: String) {
    // using xclip blocks the app. maybe piping the output to /dev/null would fix this
    // let mut cmd = process::Command::new("xclip")
    //     .arg("-in")
    //     .arg("-selection")
    //     .arg("clipboard")
    //     .stdin(Stdio::piped())
    //     .spawn()
    //     .expect("Failed to spawn child process");

    let mut cmd = process::Command::new("xsel")
        .arg("--input")
        .arg("--clipboard")
        .stdin(Stdio::piped())
        .spawn()
        .expect("Failed to spawn child process"); // TODO: better error handling

    let mut stdin = cmd.stdin.take().expect("Failed to open stdin.");

    let child_thread = std::thread::spawn(move || {
        stdin.write_all(input.as_bytes()).expect("Failed to write to stdin");
    });

    let result = child_thread.join();

    match result {
        Ok(_) => debug!("Child thread completed successfully"),
        Err(e) => error!("Child thread encountered an error: {:?}", e),
    }
}