package v1

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

	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/assert"

	"github.com/gochat/gochat/internal/service"
)

// setupContactEdgeRouter creates a test router for contact handler edge-case tests.



func setupContactEdgeRouter(handler *ContactHandler) *gin.Engine {
	gin.SetMode(gin.TestMode)
	router := gin.New()
	router.Use(gin.Recovery(), mockAuthMiddleware())
	router.POST("/api/v1/accounts/:id/contacts", handler.Create)
	router.PUT("/api/v1/accounts/:id/contacts/:contact_id", handler.Update)
	router.GET("/api/v1/accounts/:id/contacts", handler.List)
	router.GET("/api/v1/accounts/:id/contacts/search", handler.Search)
	router.DELETE("/api/v1/accounts/:id/contacts/:contact_id", handler.Delete)
	return router
}

func newContactEdgeHandler() *ContactHandler {
	return NewContactHandler(&service.ContactService{}, &service.ContactInboxService{}, &service.ContactMergeService{}, &service.ContactNoteService{})
}

// ===========================
// Create Contact edge cases
// ===========================

func TestContactCreate_EmptyBody(t *testing.T) {
	handler := newContactEdgeHandler()
	router := setupContactEdgeRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/contacts", nil)
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	assert.Contains(t, resp, "error")
}

func TestContactCreate_InvalidJSON(t *testing.T) {
	handler := newContactEdgeHandler()
	router := setupContactEdgeRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/contacts", bytes.NewBufferString(`{malformed`))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	assert.Contains(t, resp, "error")
}

func TestContactCreate_MissingRequiredName(t *testing.T) {
	handler := newContactEdgeHandler()
	router := setupContactEdgeRouter(handler)

	// name is required (validate:"required,min=1")
	w := httptest.NewRecorder()
	body := `{"email":"test@example.com"}`
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/contacts", bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	// ShouldBindJSON succeeds (valid JSON syntax), but service.Create will fail due to validation
	// With nil service, it panics → 500 from Recovery middleware
	assert.NotEqual(t, http.StatusOK, w.Code)
	assert.NotEqual(t, http.StatusCreated, w.Code)
}

func TestContactCreate_InvalidEmail(t *testing.T) {
	handler := newContactEdgeHandler()
	router := setupContactEdgeRouter(handler)

	// email has validate:"omitempty,email"; "not-an-email" is invalid
	w := httptest.NewRecorder()
	body := `{"name":"John","email":"not-an-email"}`
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/contacts", bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	// ShouldBindJSON succeeds, but service.Create rejects via validation → nil service panics → 500
	assert.NotEqual(t, http.StatusOK, w.Code)
}

func TestContactCreate_InvalidAccountID(t *testing.T) {
	handler := newContactEdgeHandler()
	router := setupContactEdgeRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/abc/contacts", bytes.NewBufferString(`{"name":"John"}`))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
}

func TestContactCreate_WrongMethod(t *testing.T) {
	handler := newContactEdgeHandler()
	router := setupContactEdgeRouter(handler)

	// Create is POST-only; sending GET returns 404 (no route for GET /contacts at same path level as POST)
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PATCH", "/api/v1/accounts/1/contacts", nil)
	router.ServeHTTP(w, req)

	assert.True(t, w.Code == http.StatusNotFound || w.Code == http.StatusBadRequest)
}

// ===========================
// Update Contact edge cases
// ===========================

func TestContactUpdate_EmptyBody(t *testing.T) {
	handler := newContactEdgeHandler()
	router := setupContactEdgeRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PUT", "/api/v1/accounts/1/contacts/1", nil)
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
}

func TestContactUpdate_InvalidJSON(t *testing.T) {
	handler := newContactEdgeHandler()
	router := setupContactEdgeRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PUT", "/api/v1/accounts/1/contacts/1", bytes.NewBufferString(`{bad json`))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
}

func TestContactUpdate_InvalidAccountID(t *testing.T) {
	handler := newContactEdgeHandler()
	router := setupContactEdgeRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PUT", "/api/v1/accounts/notanid/contacts/1", bytes.NewBufferString(`{"name":"Jane"}`))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
}

func TestContactUpdate_InvalidContactID(t *testing.T) {
	handler := newContactEdgeHandler()
	router := setupContactEdgeRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PUT", "/api/v1/accounts/1/contacts/xyz", bytes.NewBufferString(`{"name":"Jane"}`))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
}

func TestContactUpdate_InvalidEmail(t *testing.T) {
	handler := newContactEdgeHandler()
	router := setupContactEdgeRouter(handler)

	// email has validate:"omitempty,email"; "bad-email" is invalid
	w := httptest.NewRecorder()
	body := `{"email":"bad-email"}`
	req, _ := http.NewRequest("PUT", "/api/v1/accounts/1/contacts/1", bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	// ShouldBindJSON succeeds but service rejects → nil service panics → 500
	assert.NotEqual(t, http.StatusOK, w.Code)
}

// ===========================
// Search Contact edge cases
// ===========================

func TestContactSearch_InvalidAccountID(t *testing.T) {
	handler := newContactEdgeHandler()
	router := setupContactEdgeRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/abc/contacts/search?q=test", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
}

func TestContactSearch_WrongMethod(t *testing.T) {
	handler := newContactEdgeHandler()
	router := setupContactEdgeRouter(handler)

	// Search is GET-only; DELETE should return 404
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("DELETE", "/api/v1/accounts/1/contacts/search?q=test", nil)
	router.ServeHTTP(w, req)

	assert.True(t, w.Code == http.StatusNotFound || w.Code == http.StatusBadRequest)
}

// ===========================
// Delete Contact edge cases
// ===========================

func TestContactDelete_InvalidAccountID(t *testing.T) {
	handler := newContactEdgeHandler()
	router := setupContactEdgeRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("DELETE", "/api/v1/accounts/abc/contacts/1", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
}

func TestContactDelete_InvalidContactID(t *testing.T) {
	handler := newContactEdgeHandler()
	router := setupContactEdgeRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("DELETE", "/api/v1/accounts/1/contacts/notanumber", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
}