// xdg's Go tools bundle: the account's XDG desktop conventions — its folders, its default
// applications and what starts at login. Served by the node's runtime as the operator account.
//
// None needs the display. Folders, lists and autostart entries are files; xdg-mime and gio answer
// from the same files; whether a program runs is read from /proc. Only xdg_default's `set` changes
// anything, and only the person's own list of defaults.
package main

import (
	"fmt"
	"os"

	stdio "git.novox.be/novox/mesh-sdk/go"
)

func main() {
	if err := stdio.Serve("", tools(NewMachine())); err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
}

func text(args map[string]any, name string) (string, error) {
	v, ok := args[name]
	if !ok || v == nil {
		return "", nil
	}
	s, isText := v.(string)
	if !isText {
		return "", fmt.Errorf("%s is text", name)
	}
	return s, nil
}

func tools(m *Machine) []stdio.Tool {
	envArg := map[string]any{"type": "string", "description": "the desktop name dex is given (default: the session's, i3)"}
	env := func(args map[string]any) (string, error) {
		e, err := text(args, "environment")
		if err != nil || e != "" {
			return e, err
		}
		return m.Desktop, nil
	}
	return []stdio.Tool{
		{
			Name: "xdg_user_dirs",
			Description: "The account's folders (Desktop, Downloads, Documents, …) as user-dirs.dirs names them: " +
				"each one as written, the path it resolves to, whether it exists as a directory, whether it points " +
				"at the home (not wanted), and the folder xdg-user-dirs would have made instead. Also whether " +
				"xdg-user-dirs-update may rewrite the file at login, and the locale it was made in.",
			Run: func(map[string]any) (any, error) { return m.UserDirs(), nil },
		},
		{
			Name: "xdg_default",
			Description: "The default application for a MIME type (text/html) or a URL scheme (https, mailto): what " +
				"xdg-open uses, what GTK programs use, which mimeapps list decided it, the application's desktop " +
				"file and whether its program is installed. With set (a desktop file id such as firefox.desktop), " +
				"make it the default through xdg-mime: it is written to the person's own list, which the mesh " +
				"never writes and which outranks the mesh's defaults.",
			Input: map[string]any{
				"type": "object",
				"properties": map[string]any{
					"type": map[string]any{"type": "string", "description": "a MIME type (application/pdf) or a URL scheme (https, mailto)"},
					"set":  map[string]any{"type": "string", "description": "make this installed desktop file id the default (an action)"},
				},
				"required": []string{"type"},
			},
			Run: func(args map[string]any) (any, error) {
				t, err := text(args, "type")
				if err != nil {
					return nil, err
				}
				mime, err := Normalise(t)
				if err != nil {
					return nil, err
				}
				set, err := text(args, "set")
				if err != nil {
					return nil, err
				}
				if set != "" {
					return m.SetDefault(mime, set)
				}
				return m.Handle(mime), nil
			},
		},
		{
			Name: "xdg_open_handlers",
			Description: "Who opens the links and files that matter (http, https, mailto, HTML, folders, text, " +
				"Markdown, PDF, images, video, audio, and any types given): the application xdg-open and GTK " +
				"programs pick and which list decided. Also every mimeapps list in the order applications read " +
				"them, every default naming an application that is not installed, and every installed handler " +
				"whose program is missing.",
			Input: map[string]any{
				"type": "object",
				"properties": map[string]any{
					"types": map[string]any{"type": "array", "items": map[string]any{"type": "string"}, "description": "more MIME types or URL schemes to answer for"},
				},
			},
			Run: func(args map[string]any) (any, error) {
				var extra []string
				if v, ok := args["types"]; ok && v != nil {
					list, isList := v.([]any)
					if !isList {
						return nil, fmt.Errorf("types is a list of text")
					}
					for _, x := range list {
						s, isText := x.(string)
						if !isText {
							return nil, fmt.Errorf("types is a list of text")
						}
						extra = append(extra, s)
					}
				}
				return m.OpenHandlers(extra)
			},
		},
		{
			Name: "xdg_autostart",
			Description: "Every XDG autostart entry, the account's and the system's: what it runs, Hidden, " +
				"OnlyShowIn and NotShowIn, whether dex starts it at login under the window manager (and if not, " +
				"why), whether the window manager's own configuration starts the same program too, and how many " +
				"of the account's processes run it now.",
			Input: map[string]any{"type": "object", "properties": map[string]any{"environment": envArg}},
			Run: func(args map[string]any) (any, error) {
				e, err := env(args)
				if err != nil {
					return nil, err
				}
				return map[string]any{"environment": e, "entries": m.Autostarts(e)}, nil
			},
		},
		{
			Name: "xdg_check",
			Description: "Whether the account's XDG conventions are sound: user-dirs.dirs is the mesh's, every folder " +
				"it names exists and xdg-user-dirs-update cannot rewrite it; the mesh's default applications are " +
				"in place, every mimeapps list parses with nothing written twice, no default names an application " +
				"that is not installed, no handler's program is missing; no program is started twice at login and " +
				"every program dex starts is installed.",
			Input: map[string]any{"type": "object", "properties": map[string]any{"environment": envArg}},
			Run: func(args map[string]any) (any, error) {
				e, err := env(args)
				if err != nil {
					return nil, err
				}
				return m.Check(e), nil
			},
		},
	}
}