package main

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

	"github.com/BurntSushi/toml"
)

type Config struct {
	Listen         string `toml:"listen"`
	Root           string `toml:"root"`
	Hidden         bool   `toml:"hidden"`
	Footer         string `toml:"footer"`
	FollowSymlinks bool   `toml:"follow_symlinks"`
}

func loadConfig(path string) (*Config, error) {
	b, err := os.ReadFile(path)
	if err != nil {
		return nil, err
	}
	cfg := &Config{}
	md, err := toml.Decode(string(b), cfg)
	if err != nil {
		return nil, fmt.Errorf("%s: %w", path, err)
	}
	// follow_symlinks defaults to true: symlinks are served as a window onto
	// their target, even outside root.
	if !md.IsDefined("follow_symlinks") {
		cfg.FollowSymlinks = true
	}
	if cfg.Root == "" {
		return nil, errors.New(`config: "root" is required`)
	}
	root, err := filepath.Abs(cfg.Root)
	if err != nil {
		return nil, err
	}
	if info, err := os.Stat(root); err != nil || !info.IsDir() {
		return nil, fmt.Errorf("config: root %q is not a directory", root)
	}
	cfg.Root = root
	if cfg.Listen == "" {
		cfg.Listen = ":8080"
	}
	if cfg.Footer == "" {
		cfg.Footer = "kaidan 1.0"
	}
	return cfg, nil
}