package utils

import (
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"github.com/sirrobot01/decypharr/internal/testutil"
)

// checkMagnet is a helper function that verifies magnet properties
func checkMagnet(t *testing.T, magnet *Magnet, expectedInfoHash, expectedName, expectedLink string, expectedTrackerCount int, shouldBeTorrent bool) {
	t.Helper() // This marks the function as a test helper

	// Verify basic properties
	if magnet.Name != expectedName {
		t.Errorf("Expected name '%s', got '%s'", expectedName, magnet.Name)
	}
	if magnet.InfoHash != expectedInfoHash {
		t.Errorf("Expected InfoHash '%s', got '%s'", expectedInfoHash, magnet.InfoHash)
	}
	if magnet.Link != expectedLink {
		t.Errorf("Expected Link '%s', got '%s'", expectedLink, magnet.Link)
	}

	// Verify the magnet link contains the essential info hash
	if !strings.Contains(magnet.Link, "xt=urn:btih:"+expectedInfoHash) {
		t.Error("Magnet link should contain info hash")
	}

	// Verify tracker count
	trCount := strings.Count(magnet.Link, "tr=")
	if trCount != expectedTrackerCount {
		t.Errorf("Expected %d tracker URLs, got %d", expectedTrackerCount, trCount)
	}
}

// testMagnetFromFile is a helper function for tests that use GetMagnetFromFile with file operations
func testMagnetFromFile(t *testing.T, filePath string, rmTrackerUrls bool, expectedInfoHash, expectedName, expectedLink string, expectedTrackerCount int) {
	t.Helper()

	file, err := os.Open(filePath)
	if err != nil {
		t.Fatalf("Failed to open torrent file %s: %v", filePath, err)
	}
	defer file.Close()

	magnet, err := GetMagnetFromFile(file, filepath.Base(filePath), rmTrackerUrls)
	if err != nil {
		t.Fatalf("GetMagnetFromFile failed: %v", err)
	}

	checkMagnet(t, magnet, expectedInfoHash, expectedName, expectedLink, expectedTrackerCount, true)

	// Log the result
	if rmTrackerUrls {
		t.Logf("Generated clean magnet link: %s", magnet.Link)
	} else {
		t.Logf("Generated magnet link with trackers: %s", magnet.Link)
	}
}

func TestGetMagnetFromFile_RealTorrentFile_StripTrue(t *testing.T) {
	expectedInfoHash := "8a19577fb5f690970ca43a57ff1011ae202244b8"
	expectedName := "ubuntu-25.04-desktop-amd64.iso"
	expectedLink := "magnet:?xt=urn:btih:8a19577fb5f690970ca43a57ff1011ae202244b8&dn=ubuntu-25.04-desktop-amd64.iso"
	expectedTrackerCount := 0 // Should be 0 when stripping trackers

	torrentPath := testutil.GetTestTorrentPath()
	testMagnetFromFile(t, torrentPath, true, expectedInfoHash, expectedName, expectedLink, expectedTrackerCount)
}

func TestGetMagnetFromFile_RealTorrentFile_StripFalse(t *testing.T) {
	expectedInfoHash := "8a19577fb5f690970ca43a57ff1011ae202244b8"
	expectedName := "ubuntu-25.04-desktop-amd64.iso"
	expectedLink := "magnet:?xt=urn:btih:8a19577fb5f690970ca43a57ff1011ae202244b8&dn=ubuntu-25.04-desktop-amd64.iso&tr=https%3A%2F%2Ftorrent.ubuntu.com%2Fannounce&tr=https%3A%2F%2Fipv6.torrent.ubuntu.com%2Fannounce"
	expectedTrackerCount := 2 // Should be 2 when preserving trackers

	torrentPath := testutil.GetTestTorrentPath()
	testMagnetFromFile(t, torrentPath, false, expectedInfoHash, expectedName, expectedLink, expectedTrackerCount)
}

func TestGetMagnetFromFile_MagnetFile_StripTrue(t *testing.T) {
	expectedInfoHash := "8a19577fb5f690970ca43a57ff1011ae202244b8"
	expectedName := "ubuntu-25.04-desktop-amd64.iso"
	expectedLink := "magnet:?xt=urn:btih:8a19577fb5f690970ca43a57ff1011ae202244b8&dn=ubuntu-25.04-desktop-amd64.iso"
	expectedTrackerCount := 0 // Should be 0 when stripping trackers

	torrentPath := testutil.GetTestMagnetPath()
	testMagnetFromFile(t, torrentPath, true, expectedInfoHash, expectedName, expectedLink, expectedTrackerCount)
}

func TestGetMagnetFromFile_MagnetFile_StripFalse(t *testing.T) {
	expectedInfoHash := "8a19577fb5f690970ca43a57ff1011ae202244b8"
	expectedName := "ubuntu-25.04-desktop-amd64.iso"
	expectedLink := "magnet:?xt=urn:btih:8a19577fb5f690970ca43a57ff1011ae202244b8&dn=ubuntu-25.04-desktop-amd64.iso&tr=https%3A%2F%2Fipv6.torrent.ubuntu.com%2Fannounce&tr=https%3A%2F%2Ftorrent.ubuntu.com%2Fannounce"
	expectedTrackerCount := 2

	torrentPath := testutil.GetTestMagnetPath()
	testMagnetFromFile(t, torrentPath, false, expectedInfoHash, expectedName, expectedLink, expectedTrackerCount)
}

func TestGetMagnetFromUrl_MagnetLink_StripTrue(t *testing.T) {
	expectedInfoHash := "8a19577fb5f690970ca43a57ff1011ae202244b8"
	expectedName := "ubuntu-25.04-desktop-amd64.iso"
	expectedLink := "magnet:?xt=urn:btih:8a19577fb5f690970ca43a57ff1011ae202244b8&dn=ubuntu-25.04-desktop-amd64.iso"
	expectedTrackerCount := 0

	// Load the magnet URL from the test file
	magnetUrl, err := testutil.GetTestMagnetContent()
	if err != nil {
		t.Fatalf("Failed to load magnet URL from test file: %v", err)
	}

	magnet, err := GetMagnetFromUrl(magnetUrl, true)
	if err != nil {
		t.Fatalf("GetMagnetFromUrl failed: %v", err)
	}

	checkMagnet(t, magnet, expectedInfoHash, expectedName, expectedLink, expectedTrackerCount, false)
	t.Logf("Generated clean magnet link: %s", magnet.Link)
}

func TestGetMagnetFromUrl_MagnetLink_StripFalse(t *testing.T) {
	expectedInfoHash := "8a19577fb5f690970ca43a57ff1011ae202244b8"
	expectedName := "ubuntu-25.04-desktop-amd64.iso"
	expectedLink := "magnet:?xt=urn:btih:8a19577fb5f690970ca43a57ff1011ae202244b8&dn=ubuntu-25.04-desktop-amd64.iso&tr=https%3A%2F%2Fipv6.torrent.ubuntu.com%2Fannounce&tr=https%3A%2F%2Ftorrent.ubuntu.com%2Fannounce"
	expectedTrackerCount := 2

	// Load the magnet URL from the test file
	magnetUrl, err := testutil.GetTestMagnetContent()
	if err != nil {
		t.Fatalf("Failed to load magnet URL from test file: %v", err)
	}

	magnet, err := GetMagnetFromUrl(magnetUrl, false)
	if err != nil {
		t.Fatalf("GetMagnetFromUrl failed: %v", err)
	}

	checkMagnet(t, magnet, expectedInfoHash, expectedName, expectedLink, expectedTrackerCount, false)
	t.Logf("Generated magnet link with trackers: %s", magnet.Link)
}


// testMagnetFromHttpTorrent is a helper function for tests that use GetMagnetFromUrl with HTTP torrent links
func testMagnetFromHttpTorrent(t *testing.T, torrentPath string, rmTrackerUrls bool, expectedInfoHash, expectedName, expectedLink string, expectedTrackerCount int) {
	t.Helper()

	// Read the torrent file content
	torrentData, err := testutil.GetTestDataBytes(torrentPath)
	if err != nil {
		t.Fatalf("Failed to read torrent file: %v", err)
	}

	// Create a test HTTP server that serves the torrent file
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/x-bittorrent")
		w.Write(torrentData)
	}))
	defer server.Close()

	// Test the function with the mock server URL
	magnet, err := GetMagnetFromUrl(server.URL, rmTrackerUrls)
	if err != nil {
		t.Fatalf("GetMagnetFromUrl failed: %v", err)
	}

	checkMagnet(t, magnet, expectedInfoHash, expectedName, expectedLink, expectedTrackerCount, true)

	// Log the result
	if rmTrackerUrls {
		t.Logf("Generated clean magnet link from HTTP torrent: %s", magnet.Link)
	} else {
		t.Logf("Generated magnet link with trackers from HTTP torrent: %s", magnet.Link)
	}
}

func TestGetMagnetFromUrl_TorrentLink_StripTrue(t *testing.T) {
	expectedInfoHash := "8a19577fb5f690970ca43a57ff1011ae202244b8"
	expectedName := "ubuntu-25.04-desktop-amd64.iso"
	expectedLink := "magnet:?xt=urn:btih:8a19577fb5f690970ca43a57ff1011ae202244b8&dn=ubuntu-25.04-desktop-amd64.iso"
	expectedTrackerCount := 0

	testMagnetFromHttpTorrent(t, "ubuntu-25.04-desktop-amd64.iso.torrent", true, expectedInfoHash, expectedName, expectedLink, expectedTrackerCount)
}

func TestGetMagnetFromUrl_TorrentLink_StripFalse(t *testing.T) {
	expectedInfoHash := "8a19577fb5f690970ca43a57ff1011ae202244b8"
	expectedName := "ubuntu-25.04-desktop-amd64.iso"
	expectedLink := "magnet:?xt=urn:btih:8a19577fb5f690970ca43a57ff1011ae202244b8&dn=ubuntu-25.04-desktop-amd64.iso&tr=https%3A%2F%2Ftorrent.ubuntu.com%2Fannounce&tr=https%3A%2F%2Fipv6.torrent.ubuntu.com%2Fannounce"
	expectedTrackerCount := 2

	testMagnetFromHttpTorrent(t, "ubuntu-25.04-desktop-amd64.iso.torrent", false, expectedInfoHash, expectedName, expectedLink, expectedTrackerCount)
}