// Copyright (C) 2026 Danilo M. <danix@danix.xyz>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

package notify

import (
	"log"
	"path/filepath"
	"strings"

	"github.com/godbus/dbus/v5"
)

// XDGSoundDirs is the sound theme search path: the user's dir then each data
// dir, the same roots as XDGIconDirs.
func XDGSoundDirs() []string {
	dirs := XDGIconDirs()
	for i, d := range dirs {
		dirs[i] = filepath.Join(filepath.Dir(d), "sounds")
	}
	return dirs
}

var soundExts = []string{".oga", ".ogg", ".wav"}

// LookupSound resolves a sound naming spec name: the theme, its Inherits
// chain, then freedesktop, each searched across every root; within that, the
// full name first and then with trailing -components dropped, as the spec's
// fallback (message-new-email, message-new, message). "" when nothing matches.
func LookupSound(name, theme string) string {
	var chain []string
	seen := map[string]bool{}
	for t := theme; t != "" && !seen[t]; {
		seen[t] = true
		chain = append(chain, t)
		next := ""
		for _, root := range XDGSoundDirs() {
			if v := inheritsOf(filepath.Join(root, t)); v != "" {
				next = v
				break
			}
		}
		t = next
	}
	if !seen["freedesktop"] {
		chain = append(chain, "freedesktop")
	}
	for n := name; n != ""; {
		for _, t := range chain {
			for _, root := range XDGSoundDirs() {
				for _, ext := range soundExts {
					p := filepath.Join(root, t, "stereo", n+ext)
					if fileExists(p) {
						return p
					}
				}
			}
		}
		i := strings.LastIndexByte(n, '-')
		if i < 0 {
			break
		}
		n = n[:i]
	}
	return ""
}

// SoundFromHints reads the three freedesktop sound hints. sound-file wins over
// sound-name, but only as an absolute path to an existing file: anything else
// is logged and treated as absent, so the name still gets its turn. silent is
// suppress-sound, published as is; the renderer decides what it means.
func SoundFromHints(hints map[string]dbus.Variant, theme string) (sound string, silent bool) {
	if v, ok := hints["suppress-sound"]; ok {
		silent, _ = v.Value().(bool)
	}
	if v, ok := hints["sound-file"]; ok {
		if p, _ := v.Value().(string); p != "" {
			if filepath.IsAbs(p) && fileExists(p) {
				return p, silent
			}
			log.Printf("notifyd: sound-file %q is not an absolute path to a file", p)
		}
	}
	if v, ok := hints["sound-name"]; ok {
		if n, _ := v.Value().(string); n != "" {
			return LookupSound(n, theme), silent
		}
	}
	return "", silent
}