package service

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"
)

func TestNotificationChannelCRUD(t *testing.T) {
	t.Skip("requires database")
}

func TestNotificationChannelTelegram(t *testing.T) {
	t.Skip("requires database")
}

func TestNotificationUpdateSubscriptions(t *testing.T) {
	t.Skip("requires database")
}

func TestDeliverWebhook_Success(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != "POST" {
			t.Errorf("expected POST, got %s", r.Method)
		}
		if r.Header.Get("Content-Type") != "application/json" {
			t.Errorf("expected application/json content type")
		}
		var body map[string]interface{}
		json.NewDecoder(r.Body).Decode(&body)
		if body["title"] != "Test Event" {
			t.Errorf("expected title 'Test Event', got %v", body["title"])
		}
		w.WriteHeader(200)
	}))
	defer server.Close()

	svc := NewNotificationService(nil) // nil DB is fine for delivery tests
	err := svc.DeliverWebhook(context.Background(), server.URL, map[string]interface{}{
		"title": "Test Event",
	})
	if err != nil {
		t.Fatalf("expected nil error, got: %v", err)
	}
}

func TestDeliverWebhook_Non200(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(500)
	}))
	defer server.Close()

	svc := NewNotificationService(nil)
	err := svc.DeliverWebhook(context.Background(), server.URL, map[string]interface{}{})
	if err == nil {
		t.Fatal("expected error on 500 response, got nil")
	}
}

func TestDeliverWebhook_Timeout(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		time.Sleep(15 * time.Second) // exceed client timeout
	}))
	defer server.Close()

	svc := NewNotificationService(nil)
	err := svc.DeliverWebhook(context.Background(), server.URL, map[string]interface{}{})
	if err == nil {
		t.Fatal("expected error on timeout, got nil")
	}
}

func TestDeliverTelegram_Success(t *testing.T) {
	var receivedPath string
	var receivedBody map[string]interface{}

	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		receivedPath = r.URL.Path
		json.NewDecoder(r.Body).Decode(&receivedBody)
		w.WriteHeader(200)
		json.NewEncoder(w).Encode(map[string]interface{}{"ok": true})
	}))
	defer server.Close()

	svc := NewNotificationService(nil)
	svc.telegramBaseURL = server.URL // override for testing

	err := svc.DeliverTelegram(context.Background(), "123456:ABC-DEF", "987654321", "<b>Test Message</b>")
	if err != nil {
		t.Fatalf("expected nil error, got: %v", err)
	}

	expectedPath := "/bot123456:ABC-DEF/sendMessage"
	if receivedPath != expectedPath {
		t.Errorf("expected path %s, got %s", expectedPath, receivedPath)
	}
	if receivedBody["chat_id"] != "987654321" {
		t.Errorf("expected chat_id 987654321, got %v", receivedBody["chat_id"])
	}
	if receivedBody["parse_mode"] != "HTML" {
		t.Errorf("expected parse_mode HTML, got %v", receivedBody["parse_mode"])
	}
}

func TestDeliverTelegram_Non200(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(400)
		json.NewEncoder(w).Encode(map[string]interface{}{"ok": false, "description": "Bad Request"})
	}))
	defer server.Close()

	svc := NewNotificationService(nil)
	svc.telegramBaseURL = server.URL

	err := svc.DeliverTelegram(context.Background(), "token", "chat", "text")
	if err == nil {
		t.Fatal("expected error on 400 response, got nil")
	}
}

func TestCalculateBackoff(t *testing.T) {
	expected := []time.Duration{
		30 * time.Second,  // attempt 0: 30s
		60 * time.Second,  // attempt 1: 60s
		120 * time.Second, // attempt 2: 120s
		240 * time.Second, // attempt 3: 240s
		480 * time.Second, // attempt 4: 480s (capped)
		480 * time.Second, // attempt 5: still capped
	}

	for i, want := range expected {
		got := calculateBackoff(i)
		if got != want {
			t.Errorf("calculateBackoff(%d) = %v, want %v", i, got, want)
		}
	}
}

func TestMaskTelegramConfig(t *testing.T) {
	raw := json.RawMessage(`{"bot_token":"secret123","chat_id":"999"}`)
	masked := maskConfig("telegram", raw)

	var m map[string]interface{}
	json.Unmarshal(masked, &m)

	if m["bot_token"] != "***" {
		t.Errorf("expected bot_token masked as ***, got %v", m["bot_token"])
	}
	if m["chat_id"] != "999" {
		t.Errorf("expected chat_id preserved as 999, got %v", m["chat_id"])
	}
}

func TestMaskWebhookConfig(t *testing.T) {
	raw := json.RawMessage(`{"url":"https://example.com/hook"}`)
	masked := maskConfig("webhook", raw)

	var m map[string]interface{}
	json.Unmarshal(masked, &m)

	if m["url"] != "https://example.com/hook" {
		t.Errorf("expected url preserved, got %v", m["url"])
	}
}

func TestValidateChannelConfig_Webhook(t *testing.T) {
	svc := NewNotificationService(nil)

	tests := []struct {
		name    string
		config  string
		wantErr bool
	}{
		{"valid", `{"url":"https://example.com/hook"}`, false},
		{"http scheme", `{"url":"http://example.com/hook"}`, false},
		{"missing url", `{"url":""}`, true},
		{"no url field", `{}`, true},
		{"invalid scheme", `{"url":"ftp://example.com"}`, true},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			err := svc.ValidateChannelConfig("webhook", json.RawMessage(tt.config))
			if (err != nil) != tt.wantErr {
				t.Errorf("ValidateChannelConfig() error = %v, wantErr %v", err, tt.wantErr)
			}
		})
	}
}

func TestValidateChannelConfig_Telegram(t *testing.T) {
	svc := NewNotificationService(nil)

	tests := []struct {
		name    string
		config  string
		wantErr bool
	}{
		{"valid", `{"bot_token":"123:ABC","chat_id":"999"}`, false},
		{"missing bot_token", `{"bot_token":"","chat_id":"999"}`, true},
		{"missing chat_id", `{"bot_token":"123:ABC","chat_id":""}`, true},
		{"both missing", `{}`, true},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			err := svc.ValidateChannelConfig("telegram", json.RawMessage(tt.config))
			if (err != nil) != tt.wantErr {
				t.Errorf("ValidateChannelConfig() error = %v, wantErr %v", err, tt.wantErr)
			}
		})
	}
}