// Package env manages the daemon-global environment for ollie.
// It loads $XDG_CONFIG_HOME/ollie/env and provides defaults,
// formatted for export to frontends via ollie/env.
package env

import (
	"bufio"
	"os"
	"path/filepath"
	"strings"

	"ollie/paths"
)

// EnsureDefaults loads $XDG_CONFIG_HOME/ollie/env and sets default values for any
// OLLIE_* vars not already present in the process environment.
func EnsureDefaults() {
	LoadFile(filepath.Join(paths.CfgDir(), "env"))
}

// Set sets a variable in the process environment.
func Set(k, v string) { os.Setenv(k, v) } //nolint:errcheck

// LoadFile reads KEY=VALUE pairs from path and sets any key not already
// present in the environment. Lines beginning with # and blank lines are
// ignored. Missing file is silently ignored.
func LoadFile(path string) {
	f, err := os.Open(path)
	if err != nil {
		return
	}
	defer f.Close()

	sc := bufio.NewScanner(f)
	for sc.Scan() {
		line := strings.TrimSpace(sc.Text())
		if line == "" || strings.HasPrefix(line, "#") {
			continue
		}
		k, v, ok := strings.Cut(line, "=")
		if !ok {
			continue
		}
		k = strings.TrimSpace(k)
		if i := strings.Index(v, " #"); i >= 0 {
			v = v[:i]
		}
		v = strings.TrimSpace(v)
		if len(v) >= 2 && (v[0] == '"' && v[len(v)-1] == '"' || v[0] == '\'' && v[len(v)-1] == '\'') {
			v = v[1 : len(v)-1]
		}
		if k != "" && os.Getenv(k) == "" {
			os.Setenv(k, paths.ExpandHome(os.ExpandEnv(v))) //nolint:errcheck
		}
	}
}

// Get returns a variable from the process environment.
func Get(k string) string { return os.Getenv(k) }