package web_test

import (
	"bytes"
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	"code.severnaya.net/kordophone-mock/v2/model"
	"code.severnaya.net/kordophone-mock/v2/server"
	"code.severnaya.net/kordophone-mock/v2/web"
)

func TestVersion(t *testing.T) {
	s := httptest.NewServer(web.NewMockHTTPServer(web.MockHTTPServerConfiguration{}))

	resp, err := http.Get(s.URL + "/version")
	if err != nil {
		t.Fatalf("TestVersion error: %s", err)
	}

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		t.Fatalf("Error decoding body: %s", body)
	}

	if string(body) != server.VERSION {
		t.Fatalf("Unexpected return value: %s (expected %s)", body, "1.0")
	}
}

func TestStatus(t *testing.T) {
	s := httptest.NewServer(web.NewMockHTTPServer(web.MockHTTPServerConfiguration{}))

	resp, err := http.Get(s.URL + "/status")
	if err != nil {
		t.Fatalf("TestStatus error: %s", err)
	}

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		t.Fatalf("Error decoding body: %s", body)
	}

	if string(body) != "OK" {
		t.Fatalf("Unexpected return value: %s (expected %s)", body, "OK")
	}
}

func TestConversations(t *testing.T) {
	server := web.NewMockHTTPServer(web.MockHTTPServerConfiguration{})
	httpServer := httptest.NewServer(server)

	conversation := model.Conversation{
		Date:               time.Now(),
		Participants:       []string{"Alice", "Bob"},
		UnreadCount:        1,
		LastMessagePreview: "Hello world",
		Guid:               "1234567890",
	}

	server.Server.AddConversation(conversation)

	resp, err := http.Get(httpServer.URL + "/conversations")
	if err != nil {
		t.Fatalf("TestConversations error: %s", err)
	}

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		t.Fatalf("Error decoding body: %s", body)
	}

	var convos []model.Conversation
	err = json.Unmarshal(body, &convos)
	if err != nil {
		t.Fatalf("Error unmarshalling JSON: %s", err)
	}

	if len(convos) != 1 {
		t.Fatalf("Unexpected number of conversations: %d (expected %d)", len(convos), 1)
	}

	if convos[0].Guid != conversation.Guid {
		t.Fatalf("Unexpected conversation GUID: %s (expected %s)", convos[0].Guid, conversation.Guid)
	}

	if convos[0].LastMessagePreview != conversation.LastMessagePreview {
		t.Fatalf("Unexpected conversation LastMessagePreview: %s (expected %s)", convos[0].LastMessagePreview, conversation.LastMessagePreview)
	}

	if convos[0].UnreadCount != conversation.UnreadCount {
		t.Fatalf("Unexpected conversation UnreadCount: %d (expected %d)", convos[0].UnreadCount, conversation.UnreadCount)
	}

	for i, p := range convos[0].Participants {
		if p != conversation.Participants[i] {
			t.Fatalf("Unexpected conversation Participants: %s (expected %s)", p, conversation.Participants[i])
		}
	}

	if !convos[0].Date.Equal(conversation.Date) {
		t.Fatalf("Unexpected conversation Date: %s (expected %s)", convos[0].Date, conversation.Date)
	}
}

func TestAuthentication(t *testing.T) {
	s := web.NewMockHTTPServer(web.MockHTTPServerConfiguration{AuthEnabled: true})
	httpServer := httptest.NewServer(s)

	// First, try authenticated request and make sure it fails
	resp, err := http.Get(httpServer.URL + "/status")
	if err != nil {
		t.Fatalf("TestAuthentication status error: %s", err)
	}

	if resp.StatusCode != http.StatusUnauthorized {
		t.Fatalf("Unexpected status code: %d (expected %d)", resp.StatusCode, http.StatusUnauthorized)
	}

	tryAuthenticate := func(username string, password string) *http.Response {
		authRequest := web.AuthenticationRequest{
			Username: username,
			Password: password,
		}

		authRequestJSON, err := json.Marshal(authRequest)
		if err != nil {
			t.Fatalf("Error marshalling JSON: %s", err)
		}

		resp, err := http.Post(httpServer.URL+"/authenticate", "application/json", io.NopCloser(bytes.NewReader(authRequestJSON)))
		if err != nil {
			t.Fatalf("TestAuthentication error: %s", err)
		}

		return resp
	}

	// Send authentication request with bad credentials
	resp = tryAuthenticate("bad", "credentials")
	if resp.StatusCode == http.StatusOK {
		t.Fatalf("Unexpected status code: %d (expected %d)", resp.StatusCode, http.StatusUnauthorized)
	}

	// Now try good credentials
	resp = tryAuthenticate(server.AUTH_USERNAME, server.AUTH_PASSWORD)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("Unexpected status code: %d (expected %d)", resp.StatusCode, http.StatusOK)
	}

	// Decode the token from the body.
	body, err := io.ReadAll(resp.Body)
	if err != nil {
		t.Fatalf("Error decoding body: %s", body)
	}

	var authToken model.AuthToken
	err = json.Unmarshal(body, &authToken)
	if err != nil {
		t.Fatalf("Error unmarshalling JSON: %s, body: %s", err, body)
	}

	if authToken.SignedToken == "" {
		t.Fatalf("Unexpected empty signed token")
	}

	// Send a request with the signed token
	req, err := http.NewRequest(http.MethodGet, httpServer.URL+"/status", nil)
	if err != nil {
		t.Fatalf("Error creating request: %s", err)
	}

	req.Header.Set("Authorization", "Bearer "+authToken.SignedToken)

	resp, err = http.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("Error sending request: %s", err)
	}

	if resp.StatusCode != http.StatusOK {
		t.Fatalf("Unexpected status code: %d (expected %d)", resp.StatusCode, http.StatusUnauthorized)
	}

	body, err = io.ReadAll(resp.Body)
	if err != nil {
		t.Fatalf("Error decoding body: %s", body)
	}

	if string(body) != "OK" {
		t.Fatalf("Unexpected body: %s (expected %s)", body, "OK")
	}
}