streamrip-go/internal/jsonutil/jsonutil.go

// Package jsonutil provides shared helpers for working with untyped JSON
// values (map[string]any) that come from API responses across all providers.
package jsonutil

import (
	"strconv"
	"strings"
)

// StringFromAny converts a dynamic JSON value to a string.
// Numeric types are formatted without trailing zeroes.
func StringFromAny(v any) string {
	switch t := v.(type) {
	case string:
		return t
	case int:
		return strconv.Itoa(t)
	case int64:
		return strconv.FormatInt(t, 10)
	case float64:
		return strconv.FormatFloat(t, 'f', -1, 64)
	default:
		return ""
	}
}

// IntFromAny converts a dynamic JSON value to an int.
// Handles int, int64, float64, and string types.
func IntFromAny(v any) int {
	switch t := v.(type) {
	case int:
		return t
	case int32:
		return int(t)
	case int64:
		return int(t)
	case float64:
		return int(t)
	case string:
		i, _ := strconv.Atoi(strings.TrimSpace(t))
		return i
	default:
		return 0
	}
}

// FloatFromAny converts a dynamic JSON value to a float64.
func FloatFromAny(v any) float64 {
	switch t := v.(type) {
	case float64:
		return t
	case int:
		return float64(t)
	case int64:
		return float64(t)
	default:
		return 0
	}
}

// BoolFromAny converts a dynamic JSON value to a bool.
// Supports bool, string ("true"/"1"/"yes"), and numeric types.
func BoolFromAny(v any) bool {
	switch t := v.(type) {
	case bool:
		return t
	case string:
		l := strings.ToLower(strings.TrimSpace(t))
		return l == "1" || l == "true" || l == "yes"
	case int:
		return t != 0
	case int64:
		return t != 0
	case float64:
		return t != 0
	default:
		return false
	}
}

// FirstNonEmpty returns the first string in items that is non-empty after trimming.
func FirstNonEmpty(items ...string) string {
	for _, item := range items {
		if strings.TrimSpace(item) != "" {
			return strings.TrimSpace(item)
		}
	}
	return ""
}

// NestedMap returns the value at m[key] as a map[string]any.
// Returns an empty map if the key is missing or the value is not a map.
func NestedMap(m map[string]any, key string) map[string]any {
	v, ok := m[key].(map[string]any)
	if !ok {
		return map[string]any{}
	}
	return v
}

// NestedAny traverses a chain of map keys and returns the final value.
func NestedAny(v map[string]any, keys ...string) any {
	cur := any(v)
	for _, key := range keys {
		m, ok := cur.(map[string]any)
		if !ok {
			return nil
		}
		cur = m[key]
	}
	return cur
}

// NestedString traverses a chain of map keys and returns the final value as a string.
func NestedString(v map[string]any, keys ...string) string {
	return StringFromAny(NestedAny(v, keys...))
}

// TitleCase capitalises the first rune of s. This is a simple ASCII replacement
// for the deprecated strings.Title function, suitable for source names like
// "qobuz" → "Qobuz".
func TitleCase(s string) string {
	if s == "" {
		return s
	}
	r := []rune(s)
	if r[0] >= 'a' && r[0] <= 'z' {
		r[0] -= 'a' - 'A'
	}
	return string(r)
}

// DisplayArtistNames joins artist names the way the providers present them:
// "A", "A & B", or "A, B & C". Previously duplicated byte-for-byte in
// internal/app, provider/yandex and provider/beatport.
func DisplayArtistNames(names []string) string {
	switch len(names) {
	case 0:
		return ""
	case 1:
		return names[0]
	case 2:
		return names[0] + " & " + names[1]
	default:
		return strings.Join(names[:len(names)-1], ", ") + " & " + names[len(names)-1]
	}
}