package handlers

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"go.uber.org/zap"

	"veza-backend-api/internal/core/subscription"
)

func TestNewSubscriptionHandler(t *testing.T) {
	logger := zap.NewNop()
	svc := subscription.NewService(nil, logger)
	handler := NewSubscriptionHandler(svc, logger)

	if handler == nil {
		t.Fatal("expected non-nil handler")
	}
	if handler.service == nil {
		t.Error("expected non-nil service")
	}
	if handler.logger == nil {
		t.Error("expected non-nil logger")
	}
}

func TestSubscriptionHandler_GetMySubscription_NoAuth(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := subscription.NewService(nil, logger)
	handler := NewSubscriptionHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodGet, "/subscriptions/me", nil)

	handler.GetMySubscription(c)

	if w.Code != http.StatusUnauthorized {
		t.Errorf("expected 401, got %d", w.Code)
	}
}

func TestSubscriptionHandler_Subscribe_NoAuth(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := subscription.NewService(nil, logger)
	handler := NewSubscriptionHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodPost, "/subscriptions/subscribe", strings.NewReader(`{}`))
	c.Request.Header.Set("Content-Type", "application/json")

	handler.Subscribe(c)

	if w.Code != http.StatusUnauthorized {
		t.Errorf("expected 401, got %d", w.Code)
	}
}

func TestSubscriptionHandler_Subscribe_InvalidBody(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := subscription.NewService(nil, logger)
	handler := NewSubscriptionHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Set("user_id", uuid.New())
	c.Request = httptest.NewRequest(http.MethodPost, "/subscriptions/subscribe", strings.NewReader(`{}`))
	c.Request.Header.Set("Content-Type", "application/json")

	handler.Subscribe(c)

	// Should get validation error since plan_id and billing_cycle are missing
	var resp map[string]interface{}
	if err := json.NewDecoder(w.Body).Decode(&resp); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}

	if resp["success"] != false {
		t.Error("expected success=false for invalid request")
	}
}

func TestSubscriptionHandler_CancelSubscription_NoAuth(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := subscription.NewService(nil, logger)
	handler := NewSubscriptionHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodPost, "/subscriptions/cancel", nil)

	handler.CancelSubscription(c)

	if w.Code != http.StatusUnauthorized {
		t.Errorf("expected 401, got %d", w.Code)
	}
}

func TestSubscriptionHandler_GetPlan_InvalidID(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := subscription.NewService(nil, logger)
	handler := NewSubscriptionHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "id", Value: "not-a-uuid"}}
	c.Request = httptest.NewRequest(http.MethodGet, "/subscriptions/plans/not-a-uuid", nil)

	handler.GetPlan(c)

	var resp map[string]interface{}
	if err := json.NewDecoder(w.Body).Decode(&resp); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	if resp["success"] != false {
		t.Error("expected success=false for invalid plan ID")
	}
}

func TestSubscriptionHandler_ChangeBillingCycle_NoAuth(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := subscription.NewService(nil, logger)
	handler := NewSubscriptionHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodPut, "/subscriptions/billing-cycle", strings.NewReader(`{"billing_cycle":"yearly"}`))
	c.Request.Header.Set("Content-Type", "application/json")

	handler.ChangeBillingCycle(c)

	if w.Code != http.StatusUnauthorized {
		t.Errorf("expected 401, got %d", w.Code)
	}
}