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 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 you want to execute the "deactivate5g" script
    #[arg(long = "deactivate-5g", default_value_t = false)]
    deactivate5g: 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![];
    let mut pysim_outputs = vec![];
    // parse the supplied card configs
    let card_configs = parser::parse_csv(&args.csv).unwrap();
    for conf in card_configs {
        // create the arguments
        let imsi_ending = String::from(&conf.IMSI[6..]);

        // add command to be run on the open5gcore
        user_provision_commands.push(format!("./provision_user.sh -S 001010000012345 -k {} -a 8000 -o 00000000000000000000000000000000 -s 000000000010 -t 0 -c 1 -u 0 -T 12345", String::from(&conf.IMSI)));

        let pysim_args = conf.generate_pysim_args(&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);
            }
            // wait for the child process to stop
            // let child = command.stdout(Stdio::piped()).spawn().unwrap();
            // let output = child.wait_with_output().unwrap();
            let output = command.output().expect("process failed to execute");
            if output.status.success() {
                let output_string = String::from_utf8(output.stdout).unwrap();
                pysim_outputs.push(output_string.clone());
                println!("{} ", output_string);
                println!("{} programmed sim card", "SUCCESSFULLY".green());
            } else {
                println!("{} ", String::from_utf8(output.stderr).unwrap());
                println!("{}, please check the output of pySim above!", "ERROR".red());
                continue;
            }
        }

        // possibly execute deactivate5g command
        if args.deactivate5g {
            println!("{}: ./pySim-shell.py -p{} --script scripts/deactivate-5g.script", "EXECUTING".red(), &args.device);
            if args.dry_run {
                print!("{}: The command is not executed since {} is enabled\n", "WARNING".yellow(), "dry_run".yellow());
                continue;
            }
            println!("{}. Not Implemented Yet!", "TODO".red());
        }
    }

    // output to file
    let mut file = File::create(args.output_file).unwrap();
    writeln!(&mut file, "PySim outputs:").unwrap();
    for pysim_out in pysim_outputs {
        writeln!(&mut file, "{}", pysim_out).unwrap();
    }
    writeln!(&mut file, "\nCommands to be executed on core:").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 => {
            return 'a' != next_string.chars().next().unwrap()
        }
        Ok(_) => return true,  // other input is ignored
        Err(err) => panic!("{}", err),
    };
}