// Package config loads the curated app list for the once-add wizard from
// /etc/once-add/apps.toml, writing a default seed if the file is absent.
package config

import (
	"os"
	"path/filepath"

	"github.com/BurntSushi/toml"
)

// Path is the on-disk location of the curated app list. Edit it to add apps;
// no rebuild of once-add is needed.
const Path = "/etc/once-add/apps.toml"

// App is one curated entry shown in the wizard's app picker.
type App struct {
	Name        string `toml:"name"`        // display name, e.g. "Writebook"
	Image       string `toml:"image"`       // container image ref
	Description string `toml:"description"` // one-line description
	Suggested   string `toml:"suggested"`   // pre-fills the hostname field
}

type file struct {
	App []App `toml:"app"`
}

const defaultSeed = `# once-add curated apps. Edit freely — add [[app]] blocks; no rebuild needed.
# 'suggested' pre-fills the hostname field in the wizard.

[[app]]
name        = "Writebook"
image       = "ghcr.io/basecamp/writebook"
description = "Books & documentation"
suggested   = "book"

[[app]]
name        = "Campfire"
image       = "ghcr.io/basecamp/once-campfire"
description = "Team chat"
suggested   = "chat"
`

// Load reads the curated app list, writing the default seed first if the file
// does not yet exist. Writing the seed requires root (once-add runs as root).
func Load() ([]App, error) {
	if _, err := os.Stat(Path); os.IsNotExist(err) {
		if err := writeDefault(); err != nil {
			return nil, err
		}
	}
	var f file
	if _, err := toml.DecodeFile(Path, &f); err != nil {
		return nil, err
	}
	return f.App, nil
}

func writeDefault() error {
	if err := os.MkdirAll(filepath.Dir(Path), 0o755); err != nil {
		return err
	}
	return os.WriteFile(Path, []byte(defaultSeed), 0o644)
}