use blockchain::env;
use blockchain::from_str;
use blockchain::read_to_string;
use blockchain::tilde;
use blockchain::wallets::structures::Wallet;
use blockchain::Value;
use rustyline::completion::FilenameCompleter;
use rustyline::error::ReadlineError;
use rustyline::{history::DefaultHistory, CompletionType, Config, Editor};
use rustyline_derive::Completer;
use rustyline_derive::Helper as RustyHelper;
use rustyline_derive::Highlighter as RustyHighlighter;
use rustyline_derive::Hinter as RustyHinter;
use rustyline_derive::Validator as RustyValidator;

async fn read_address_file(path: &str) -> Result<String, String> {
    // Allow ~ in paths and then extract either a raw address or an address from wallet JSON.
    let expanded_path = tilde(path).to_string();
    read_to_string(&expanded_path)
        .await
        .map_err(|e| format!("Failed to read {expanded_path}: {e}"))
        .and_then(|contents| extract_address(&contents))
}

fn extract_address(contents: &str) -> Result<String, String> {
    // Address files may be a plain address string or a saved wallet JSON object.
    let trimmed = contents.trim();
    if trimmed.is_empty() {
        return Err("Address file is empty".to_string());
    }

    if trimmed.starts_with('{') {
        // Prefer the short address when present, but accept long_address for wallet validation too.
        let value: Value =
            from_str(trimmed).map_err(|e| format!("Failed to parse wallet JSON: {e}"))?;
        let address = value
            .get("short_address")
            .and_then(|v| v.as_str())
            .or_else(|| value.get("long_address").and_then(|v| v.as_str()))
            .ok_or_else(|| "Wallet JSON does not contain a usable address field".to_string())?;
        return Ok(address.trim().to_string());
    }

    Ok(trimmed.to_string())
}

#[derive(RustyHelper, Completer, RustyHinter, RustyHighlighter, RustyValidator)]
struct PathHelper {
    #[rustyline(Completer)]
    completer: FilenameCompleter,
}

fn prompt_for_path(prompt: &str) -> Result<String, String> {
    // Rustyline gives the interactive prompt filesystem completion.
    let config = Config::builder()
        .completion_type(CompletionType::List)
        .build();
    let mut editor =
        Editor::<PathHelper, DefaultHistory>::with_config(config).map_err(|e| e.to_string())?;
    editor.set_helper(Some(PathHelper {
        completer: FilenameCompleter::new(),
    }));

    match editor.readline(prompt) {
        Ok(line) => Ok(line.trim().to_string()),
        Err(ReadlineError::Interrupted) | Err(ReadlineError::Eof) => {
            Err("Input cancelled".to_string())
        }
        Err(err) => Err(format!("Failed to read address file path: {err}")),
    }
}

#[tokio::main]
async fn main() {
    // Accept the address file path as an arg or prompt interactively.
    let args: Vec<String> = env::args().collect();

    if args.len() > 1 && args.len() != 2 {
        println!("Usage: ./verify_address <address_file>");
        return;
    }

    let address_path = if args.len() == 2 {
        args[1].clone()
    } else {
        match prompt_for_path(
            "Please enter the path to the file containing the wallet address: ",
        ) {
            Ok(path) => path,
            Err(err) => {
                eprintln!("{err}");
                return;
            }
        }
    };

    let address = match read_address_file(&address_path).await {
        Ok(address) => address,
        Err(err) => {
            println!("{err}");
            return;
        }
    };

    // Verify either a long wallet address or a current-network short address.
    let message_hash = Wallet::wallet_validation(address.trim()).await
        || Wallet::short_address_validation(address.trim());

    println!("{message_hash}");
}