use clap::builder::FalseyValueParser;

use clap::{value_parser, Arg, ArgAction, Command};

pub fn build_cli() -> Command {

let file_name_help = concat!(

"Script to run. Can be:\n\n",

"1. a path to a script file\n",

"2. the name of a script in ./scripts (without .fi extension)\n",

"3. a single dash to read from stdin\n",

);

let file_name_arg =

Arg::new("FILE_NAME").index(1).required(false).help(file_name_help);

let code_arg = Arg::new("code")

.short('c')

.long("code")

.required(false)

.num_args(1)

.help("Use this to run short snippets of code");

let dis_arg = Arg::new("dis")

.short('i')

.long("dis")

.action(ArgAction::SetTrue)

.help("disassemble instructions?");

let history_path_arg = Arg::new("history_path")

.long("history-path")

.required(false)

.num_args(1)

.default_value("~/.config/feint/repl-history")

.help("Path to REPL history file");

let no_history_arg = Arg::new("no_history")

.long("no-history")

.action(ArgAction::SetTrue)

.help("Disable REPL history? [default: history enabled]");

let argv_help = concat!(

"Additional args will be set as system.argv.\n",

"Can be used when running a script and with -c.\n",

"CANNOT be used when running REPL."

);

let argv_arg =

Arg::new("argv").index(2).trailing_var_arg(true).num_args(0..).help(argv_help);

Command::new("FeInt")

.version("0.0.0")

.arg(

Arg::new("max_call_depth")

.short('x')

.long("max-call-depth")

.default_value("0")

.value_parser(value_parser!(usize))

.env("FEINT_MAX_CALL_DEPTH")

.help("Maximum call/recursion depth"),

)

.arg(

Arg::new("debug")

.short('d')

.long("debug")

.action(ArgAction::SetTrue)

.value_parser(FalseyValueParser::new())

.env("FEINT_DEBUG")

.help("Enable debug mode?"),

)

// Subcommand: run (when no subcommand is specified)

.arg(&file_name_arg)

.arg(&code_arg)

.arg(&dis_arg)

.arg(&history_path_arg)

.arg(&no_history_arg)

.arg(&argv_arg)

.subcommands([

// Subcommand: run

Command::new("run")

.about("Run script or code")

.arg(&file_name_arg)

.arg(&code_arg)

.arg(&dis_arg)

.arg(&history_path_arg)

.arg(&no_history_arg)

.arg(&argv_arg),

// Subcommand: test

Command::new("test")

.about("Run test")

.arg(Arg::new("argv").index(1).trailing_var_arg(true).num_args(0..)),

])

}