package config

import (
	"fmt"
	"net/url"
	"os"
	"path/filepath"

	"gopkg.in/ini.v1"
)

type Serve struct {
	Addr string `ini:"addr"`
}

type Instance struct {
	Name         string `ini:"name"`
	ContactEmail string `ini:"contact-email"`
	BaseURL      string `ini:"base-url"`
}

type Config struct {
	Serve    Serve    `ini:"serve"`
	Instance Instance `ini:"instance"`
}

var systemConfigPath = "/etc/openstore/openstore.conf"

func DefaultPath() (string, error) {
	dir, err := os.UserConfigDir()
	if err != nil {
		return "", err
	}

	return filepath.Join(dir, "openstore", "openstore.conf"), nil
}

func Load(filename string) (*Config, error) {
	cfg, err := ini.LoadSources(ini.LoadOptions{
		Loose:              true,
		KeyValueDelimiters: "=",
	}, systemConfigPath, filename)

	if err != nil {
		return nil, err
	}

	config := &Config{
		Serve: Serve{
			Addr: ":3000",
		},
		Instance: Instance{
			Name:         "Openstore",
			ContactEmail: "jane@doe.com",
			BaseURL:      "https://www.example.com",
		},
	}

	err = cfg.MapTo(config)
	if err != nil {
		return nil, err
	}

	u, err := url.Parse(config.Instance.BaseURL)
	if err != nil || u.Host == "" || u.Scheme == "" {
		return nil, fmt.Errorf(
			"config: base-url must be an absolute url, got %s",
			config.Instance.BaseURL,
		)
	}

	return config, nil
}