package runtime

import (
	"os"
	"path/filepath"
	"strconv"
)

type Environment struct {
	Version          string
	Codename         string
	DataDirectory    string
	ContentDirectory string
	Hostname         string
	Port             int
	WatchInterval    int
}

// part of environment checking
func safeStringGrab(key, fallback string) string {
	if v, ok := os.LookupEnv(key); ok {
		return v
	}
	return fallback
}

func safeIntGrab(key string, fallback int) int {
	if v, ok := os.LookupEnv(key); ok {
		if i, err := strconv.Atoi(v); err == nil {
			return i
		}
	}
	return fallback
}

func GrabEnvironment() Environment {
	cwd, err := os.Getwd()
	if err != nil {
		cwd = "."
	}

	fbBase := filepath.Join(cwd, "data")
	fbContent := filepath.Join(fbBase, "content")

	return Environment{
		Version:          safeStringGrab("VERSION", "0.0.1"),
		Codename:         safeStringGrab("CODENAME", "Magical Anomaly"),
		DataDirectory:    safeStringGrab("DATA_DIR", fbBase),
		ContentDirectory: safeStringGrab("CONTENT_DIR", fbContent),
		Hostname:         safeStringGrab("HOSTNAME", "0.0.0.0"),

		Port:          safeIntGrab("PORT", 8080),
		WatchInterval: safeIntGrab("WATCHDOG_INTERVAL", 60),
	}
}

// part of filesystem checking
func EnsureOperation(workDir string) error {
	nDirs := []string{
		workDir,
		filepath.Join(workDir, "data"),
		filepath.Join(workDir, "data", "content"),
		filepath.Join(workDir, "web"),
	}

	for _, p := range nDirs {
		if err := os.MkdirAll(p, 0755); err != nil {
			return err
		}
	}

	return nil
}