package model

import (
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
)

func TestLoadFeed_Success(t *testing.T) {
	// Mock RSS feed
	rssFeed := `
		<rss version="2.0">
			<channel>
				<title>Test Podcast</title>
				<description>This is a test podcast</description>
				<link>http://example.com</link>
				<image>
					<url>http://example.com/image.jpg</url>
				</image>
				<copyright>Test Copyright</copyright>
				<language>en</language>
				<item>
					<title>Episode 1</title>
					<link>http://example.com/episode1</link>
					<description>Episode 1 description</description>
				</item>
			</channel>
		</rss>
	`

	// Create a test server
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte(rssFeed))
	}))
	defer server.Close()

	// Call LoadFeed
	podcast, err := LoadFeed(server.URL, "", 10*time.Second)

	// Assertions
	assert.NoError(t, err)
	assert.NotNil(t, podcast)
	assert.Equal(t, "Test Podcast", podcast.Title)
	assert.Equal(t, "This is a test podcast", podcast.Description)
	assert.Equal(t, "http://example.com", podcast.Link)
	assert.Equal(t, "http://example.com/image.jpg", podcast.Image)
	assert.Equal(t, "Test Copyright", podcast.Copyright)
	assert.Equal(t, "en", podcast.Language)
	assert.Len(t, podcast.Episodes, 1)
	assert.Equal(t, "Episode 1", podcast.Episodes[0].Title)
}

func TestLoadFeed_Timeout(t *testing.T) {
	// Create a test server that delays response
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		time.Sleep(2 * time.Second)
		w.Write([]byte("<rss></rss>"))
	}))
	defer server.Close()

	// Call LoadFeed with a short timeout
	_, err := LoadFeed(server.URL, "", 1*time.Second)

	// Assertions
	assert.Error(t, err)
	assert.Contains(t, err.Error(), "context deadline exceeded")
}

func TestLoadFeed_InvalidURL(t *testing.T) {
	// Call LoadFeed with an invalid URL
	_, err := LoadFeed("http://invalid-url", "", 10*time.Second)

	// Assertions
	assert.Error(t, err)
	assert.Contains(t, err.Error(), "解析播客订阅失败")
}

func TestLoadFeed_EmptyFeed(t *testing.T) {
	// Create a test server with an empty feed
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte(""))
	}))
	defer server.Close()

	// Call LoadFeed
	_, err := LoadFeed(server.URL, "", 10*time.Second)

	// Assertions
	assert.Error(t, err)
	assert.Contains(t, err.Error(), "解析播客订阅失败")
}