package smtp2shoutrrr

import (
	"context"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"net/smtp"
	"testing"
	"time"

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

func TestEmailForwarding(t *testing.T) {
	// Start mock ntfy server
	notifications := make([]string, 0)
	mockServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			w.WriteHeader(http.StatusMethodNotAllowed)
			return
		}

		// Read body and log
		body, err := io.ReadAll(r.Body)
		if err != nil {
			w.WriteHeader(http.StatusInternalServerError)
			return
		}

		notifications = append(notifications, string(body))
		w.WriteHeader(http.StatusOK)
	}))
	defer mockServer.Close()

	// Configure the SMTP server
	config := &Config{
		Port:     2525,
		Username: "testuser",
		Password: "testpass",
		Recipients: []ConfigRecipient{
			{
				Addresses: []string{"test@example.com"},
				Target:    "generic+" + mockServer.URL + "/?template=json",
			},
		},
	}

	ctx := context.Background()
	smtpServer := NewSMTPServer(config)

	// Start the server
	go func() {
		if err := smtpServer.Start(ctx); err != nil {
			t.Errorf("failed to start server: %v", err)
		}
	}()

	// Give the server time to start
	time.Sleep(100 * time.Millisecond)
	defer func() {
		if err := smtpServer.Stop(ctx); err != nil {
			t.Errorf("failed to stop server: %v", err)
		}
	}()

	// Send test email
	auth := smtp.PlainAuth("", config.Username, config.Password, "localhost")
	err := smtp.SendMail(
		fmt.Sprintf("localhost:%d", config.Port),
		auth,
		"sender@example.com",
		[]string{"test@example.com"},
		[]byte("Subject: Test Email\r\n\r\nThis is a test email body"),
	)
	require.NoError(t, err)

	// Give some time for the notification to be processed
	time.Sleep(100 * time.Millisecond)

	// Verify the notification was received
	require.Len(t, notifications, 1)
	require.Contains(t, notifications[0], "This is a test email body")
}

func TestMultipleTargets(t *testing.T) {
	// Track notifications received
	notifications := make([]string, 0)
	mockServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			w.WriteHeader(http.StatusMethodNotAllowed)
			return
		}

		body, err := io.ReadAll(r.Body)
		if err != nil {
			w.WriteHeader(http.StatusInternalServerError)
			return
		}

		notifications = append(notifications, string(body))
		w.WriteHeader(http.StatusOK)
	}))
	defer mockServer.Close()

	// Configure with multiple targets
	config := &Config{
		Port:     2526,
		Username: "testuser",
		Password: "testpass",
		Recipients: []ConfigRecipient{
			{
				Addresses: []string{"test@example.com"},
				Targets: []string{
					"generic+" + mockServer.URL + "/?template=json&id=1",
					"generic+" + mockServer.URL + "/?template=json&id=2",
				},
			},
		},
	}

	ctx := context.Background()
	smtpServer := NewSMTPServer(config)

	go func() {
		if err := smtpServer.Start(ctx); err != nil {
			t.Errorf("failed to start server: %v", err)
		}
	}()

	time.Sleep(100 * time.Millisecond)
	defer func() {
		if err := smtpServer.Stop(ctx); err != nil {
			t.Errorf("failed to stop server: %v", err)
		}
	}()

	// Send test email
	auth := smtp.PlainAuth("", config.Username, config.Password, "localhost")
	err := smtp.SendMail(
		fmt.Sprintf("localhost:%d", config.Port),
		auth,
		"sender@example.com",
		[]string{"test@example.com"},
		[]byte("Subject: Multiple Targets Test\r\n\r\nTest body for multiple targets"),
	)
	require.NoError(t, err)

	time.Sleep(100 * time.Millisecond)

	// Verify both targets received notification
	require.Len(t, notifications, 2)
	require.Contains(t, notifications[0], "Test body for multiple targets")
	require.Contains(t, notifications[1], "Test body for multiple targets")
}

func TestTargetAndTargetsMerging(t *testing.T) {
	// Track notifications and targets hit
	notificationCount := 0
	mockServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			w.WriteHeader(http.StatusMethodNotAllowed)
			return
		}

		_, _ = io.ReadAll(r.Body)
		notificationCount++
		w.WriteHeader(http.StatusOK)
	}))
	defer mockServer.Close()

	// Configure with both Target (deprecated) and Targets
	config := &Config{
		Port:     2527,
		Username: "testuser",
		Password: "testpass",
		Recipients: []ConfigRecipient{
			{
				Addresses: []string{"test@example.com"},
				Target:    "generic+" + mockServer.URL + "/?template=json&id=legacy",
				Targets: []string{
					"generic+" + mockServer.URL + "/?template=json&id=new1",
					"generic+" + mockServer.URL + "/?template=json&id=new2",
				},
			},
		},
	}

	ctx := context.Background()
	smtpServer := NewSMTPServer(config)

	go func() {
		if err := smtpServer.Start(ctx); err != nil {
			t.Errorf("failed to start server: %v", err)
		}
	}()

	time.Sleep(100 * time.Millisecond)
	defer func() {
		if err := smtpServer.Stop(ctx); err != nil {
			t.Errorf("failed to stop server: %v", err)
		}
	}()

	// Send test email
	auth := smtp.PlainAuth("", config.Username, config.Password, "localhost")
	err := smtp.SendMail(
		fmt.Sprintf("localhost:%d", config.Port),
		auth,
		"sender@example.com",
		[]string{"test@example.com"},
		[]byte("Subject: Merging Test\r\n\r\nTest body"),
	)
	require.NoError(t, err)

	time.Sleep(100 * time.Millisecond)

	// Verify all 3 targets received notification (1 from Target + 2 from Targets)
	require.Equal(t, 3, notificationCount)
}

func TestPartialTargetFailure(t *testing.T) {
	// Track successful notifications
	successCount := 0
	mockServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			w.WriteHeader(http.StatusMethodNotAllowed)
			return
		}

		_, _ = io.ReadAll(r.Body)

		// Fail if URL path contains "fail"
		if r.URL.Path == "/fail" {
			w.WriteHeader(http.StatusInternalServerError)
			return
		}

		successCount++
		w.WriteHeader(http.StatusOK)
	}))
	defer mockServer.Close()

	// Configure with mix of good and bad targets
	config := &Config{
		Port:     2528,
		Username: "testuser",
		Password: "testpass",
		Recipients: []ConfigRecipient{
			{
				Addresses: []string{"test@example.com"},
				Targets: []string{
					"generic+" + mockServer.URL + "/success1?template=json",
					"generic+" + mockServer.URL + "/fail?template=json",
					"generic+" + mockServer.URL + "/success2?template=json",
				},
			},
		},
	}

	ctx := context.Background()
	smtpServer := NewSMTPServer(config)

	go func() {
		if err := smtpServer.Start(ctx); err != nil {
			t.Errorf("failed to start server: %v", err)
		}
	}()

	time.Sleep(100 * time.Millisecond)
	defer func() {
		if err := smtpServer.Stop(ctx); err != nil {
			t.Errorf("failed to stop server: %v", err)
		}
	}()

	// Send test email
	auth := smtp.PlainAuth("", config.Username, config.Password, "localhost")
	err := smtp.SendMail(
		fmt.Sprintf("localhost:%d", config.Port),
		auth,
		"sender@example.com",
		[]string{"test@example.com"},
		[]byte("Subject: Partial Failure Test\r\n\r\nTest body"),
	)
	require.NoError(t, err)

	time.Sleep(100 * time.Millisecond)

	// Verify that 2 out of 3 targets succeeded
	require.Equal(t, 2, successCount)
}

func TestInvalidTargetURLs(t *testing.T) {
	// Track notifications
	notifications := make([]string, 0)
	mockServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			w.WriteHeader(http.StatusMethodNotAllowed)
			return
		}

		body, _ := io.ReadAll(r.Body)
		notifications = append(notifications, string(body))
		w.WriteHeader(http.StatusOK)
	}))
	defer mockServer.Close()

	// Configure with invalid and valid URLs
	config := &Config{
		Port:     2529,
		Username: "testuser",
		Password: "testpass",
		Recipients: []ConfigRecipient{
			{
				Addresses: []string{"test@example.com"},
				Targets: []string{
					"://invalid-url", // Invalid URL
					"generic+" + mockServer.URL + "/?template=json&id=1", // Valid URL
					"ht!tp://bad url with spaces",                        // Invalid URL
					"generic+" + mockServer.URL + "/?template=json&id=2", // Valid URL
				},
			},
		},
	}

	ctx := context.Background()
	smtpServer := NewSMTPServer(config)

	go func() {
		if err := smtpServer.Start(ctx); err != nil {
			t.Errorf("failed to start server: %v", err)
		}
	}()

	time.Sleep(100 * time.Millisecond)
	defer func() {
		if err := smtpServer.Stop(ctx); err != nil {
			t.Errorf("failed to stop server: %v", err)
		}
	}()

	// Send test email
	auth := smtp.PlainAuth("", config.Username, config.Password, "localhost")
	err := smtp.SendMail(
		fmt.Sprintf("localhost:%d", config.Port),
		auth,
		"sender@example.com",
		[]string{"test@example.com"},
		[]byte("Subject: Invalid URLs Test\r\n\r\nTest body"),
	)
	require.NoError(t, err)

	time.Sleep(100 * time.Millisecond)

	// Verify only valid URLs received notifications (2 out of 4)
	require.Len(t, notifications, 2)
}