package main

import (
	"errors"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
)

func run_r_script(name string, args []string) error {
	var rpath, logpath string
	var ok bool
	workdate, dealname, reinvflag := args[0], args[1], args[2]

	if val, ok := os.LookupEnv("CODE_DIR"); ok {
		rpath = filepath.Join(val, "R")
	} else {
		return errors.New("CODE_DIR environment variable not set.")
	}

	if logpath, ok = os.LookupEnv("SERENITAS_LOG_DIR"); !ok {
		return errors.New("SERENITAS_LOG_DIR environment variable not set.")
	}

	cmd := exec.Command("Rscript", "--vanilla", filepath.Join(rpath, fmt.Sprintf("%s.R", name)),
		workdate, dealname+","+reinvflag)
	cmd.Dir = rpath
	if f, err := os.OpenFile(filepath.Join(logpath, fmt.Sprintf("%s.Rout", name)),
		os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0600); err != nil {
		return err
	} else {
		cmd.Stdout = f
		if err := cmd.Run(); err != nil {
			return err
		}
		return nil
	}
}

func run_python_script(name string, args []string) error {

	var python_path string
	if val, ok := os.LookupEnv("CODE_DIR"); ok {
		python_path = filepath.Join(val, "python")
	} else {
		return errors.New("CODE_DIR environment variable not set.")
	}
	args = append([]string{filepath.Join(python_path, name)}, args...)
	cmd := exec.Command("python3", args...)
	cmd.Dir = python_path
	return cmd.Run()
}

var tasks = map[string]func([]string) error{
	"build_portfolios": func(args []string) error {
		return run_r_script("build_portfolios", args)
	},
	"build_scenarios": func(args []string) error {
		return run_r_script("build_scenarios", args)
	},
	"generate_scenarios": func(args []string) error {
		return run_python_script(filepath.Join("intex", "intex_scenarios.py"), args)
	},
}