package service

import (
	"testing"
)

func TestParseFormatJSON(t *testing.T) {
	data := []byte(`{
		"id": "vid",
		"formats": [
			{"format_id": "18", "ext": "mp4", "resolution": "640x360", "fps": 30, "vcodec": "avc1", "acodec": "mp4a", "format_note": "360p"},
			{"format_id": "137", "ext": "mp4", "width": 1920, "height": 1080, "fps": 60, "vcodec": "avc1", "acodec": "none", "filesize": 1048576, "format_note": "1080p"},
			{"format_id": "233", "ext": "m4a", "resolution": "audio only", "vcodec": "none", "acodec": "mp4a", "audio_channels": 2, "format_note": "audio"}
		]
	}`)
	formats, err := parseFormatJSON(data)
	if err != nil {
		t.Fatalf("parseFormatJSON: %v", err)
	}
	if len(formats) != 3 {
		t.Fatalf("expected 3 formats, got %d: %+v", len(formats), formats)
	}
	if formats[0].ID != "18" || formats[0].Ext != "mp4" || formats[0].Resolution != "640x360" {
		t.Errorf("format[0] = %+v", formats[0])
	}
	if formats[0].FPS != "30" {
		t.Errorf("format[0] fps = %q, want 30", formats[0].FPS)
	}
	// Resolution is derived from width/height when no resolution string is present.
	if formats[1].Resolution != "1920x1080" {
		t.Errorf("format[1] resolution = %q, want 1920x1080", formats[1].Resolution)
	}
	if formats[1].FileSize != "1.0 MiB" {
		t.Errorf("format[1] filesize = %q, want 1.0 MiB", formats[1].FileSize)
	}
	// Audio-only format: codec falls back to acodec and channels are populated.
	if formats[2].Codec != "mp4a" {
		t.Errorf("format[2] codec = %q, want mp4a", formats[2].Codec)
	}
	if formats[2].Channels != "2" {
		t.Errorf("format[2] channels = %q, want 2", formats[2].Channels)
	}
}

func TestParseFormatJSONPlaylistFallback(t *testing.T) {
	// A playlist dump exposes formats under the first entry, not at the top level.
	data := []byte(`{"_type":"playlist","entries":[{"id":"a","formats":[{"format_id":"18","ext":"mp4"}]}]}`)
	formats, err := parseFormatJSON(data)
	if err != nil {
		t.Fatalf("parseFormatJSON: %v", err)
	}
	if len(formats) != 1 || formats[0].ID != "18" {
		t.Fatalf("expected 1 format from entry fallback, got %+v", formats)
	}
}