use std::fs::File;
use std::io::prelude::*;
use std::process::{Command, exit};
use clap::Parser;
use colored::*;


mod parser;


// setup cli parser
#[derive(Parser, Debug)]
#[command(
    author = "Julius Herrmann (juhe00002@uni-saarland.de)",
    about = "A simple tool to enable batch writing od 'sysoISIm-SJA2' cards with the corresponding CSV data by the manufacturer",
    long_about = None)]
pub struct CliArgs {
    /// The path to the pySim binary
    #[arg(short = 'b', long = "binary", default_value_t = String::from("./pySim-prog.py"))]
    bin: String,
    /// The path to the csv file to read
    #[arg(short = 'c', long = "csv")]
    csv: String,
    /// Set the output file with the commands for the HSS on the core
    #[arg(short = 'o', long = "output", default_value_t = String::from("output"))]
    output_file: String,
    /// The name of the nework
    #[arg(short = 'n', long = "name")]
    name: String,
    /// The mcc code
    #[arg(long = "mcc")]
    mcc: String,
    /// The mnc code
    #[arg(long = "mnc")]
    mnc: String,
    #[arg(short = 'd', long = "device", default_value_t = 0)]
    device: u8,
    #[arg(long = "ki", default_value_t = String::from("00000000000000000000000000000000"))]
    ki: String,
    #[arg(long = "opc", default_value_t = String::from("00000000000000000000000000000000"))]
    opc: String,
    /// Set true if you want to use an op key instead of opc
    #[arg(long = "use-op", default_value_t = false)]
    use_op: bool,
    #[arg(long = "op", default_value_t = String::from("00000000000000000000000000000000"))]
    op: String,
    /// Set true if IMS is used 
    #[arg(long = "ims", default_value_t = false)]
    ims: bool,
    /// Set true to only do a dry run (print commands and not execute them)
    #[arg(long = "dry-run", default_value_t = false)]
    dry_run: bool,
}

fn main() {
    let args = CliArgs::parse();
    let mut user_provision_commands = vec![];
    // parse the supplied card configs
    let card_configs = parser::parse_csv(&args.csv).unwrap();
    for mut conf in card_configs {
        // get the ending of the IMSI to distinguish cards
        let imsi_ending = parser::get_imsi_ending(&mut conf);

        // calculate the new IMSI
        parser::update_imsi(&mut conf, &args);

        let pysim_args = parser::generate_pysim_args(&conf, &args);

        println!("\n{}:", "EXECUTING".red());
        print!("{}", args.bin);
        for pysim_arg in &pysim_args {
            print!(" {}", pysim_arg);
        }

        if !wait_for_user(&format!("Please insert the sim-card with IMSI ending in: {}", imsi_ending.green())) {
            exit_programm(1);
        }

        if args.dry_run {
            println!("{}: The command is not executed since {} is enabled", "WARNING".yellow(), "dry_run".yellow());
        } else {
            let mut command = Command::new(&args.bin);
            for pysim_arg in pysim_args {
                command.arg(pysim_arg);
            }
            // execute pySim and wait for it to stop
            let output = command.output().expect("process failed to execute!");
            if output.status.success() {
                println!("{} ", String::from_utf8(output.stdout).unwrap());
                println!("{} programmed sim card", "SUCCESSFULLY".green());
            } else {
                println!("{} ", String::from_utf8(output.stdout).unwrap());
                println!("{} ", String::from_utf8(output.stderr).unwrap());
                println!("{}, please check the output of pySim above!", "ERROR".red());
                continue;
            }
        }


        // add command to be run on the open5gcore
        /*
        * S = imsi
        * k = Ki
        * a = 8000 amf
        * o = opc/op
        * s = sqn (= 0)
        * t = auth_type (= 0)
        * c = op is opc
        * u = usim_type (= 0)
        */
        let mut user_provision_command = format!("./provision_user.sh -S {} -k {} -a {} -o {} -s {} -t {} -c {} -u {}",
            String::from(&conf.IMSI),
            args.ki,
            "8000",
            {
                if args.use_op {
                    &args.op
                } else {
                    &args.opc
                }
            },
            "0",
            "0",
            {
                if args.use_op {
                    "0"
                } else {
                    "1"
                }
            },
            "0"
        );

        if args.ims {
            user_provision_command.push_str(&format!(" -n mnc{}.mcc{}.3gppnetwork.org -T 49{}", args.mnc, args.mcc, imsi_ending));
        }

        user_provision_commands.push(user_provision_command);
    }

    // output to file
    let mut file = File::create(args.output_file).unwrap();
    for command in user_provision_commands {
        writeln!(&mut file, "{}", command).unwrap();
    }

    exit_programm(0)
}

fn exit_programm(code: i32) {
    println!("{}", "GOODBYE!".green());
    exit(code);
}

// wait for user to input enter. If a is entered return false signaling to stop the program
fn wait_for_user(msg: &str) -> bool {
    println!("\n{}\nPress enter to continue or 'a' to abort:", msg);
    let mut next_string = String::new();
    match std::io::stdin().read_line(&mut next_string) {
        Ok(n) if n > 0 => {
            !next_string.starts_with('a')
        }
        Ok(_) => true,  // other input is ignored
        Err(err) => panic!("{}", err),
    }
}