package v1

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

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

	"github.com/gochat/gochat/internal/model"
	"github.com/gochat/gochat/internal/search"
)

// mockSearchRepo implements search.SearchRepoInterface for handler tests.
type mockSearchRepo struct {
	conversations []model.Conversation
	convTotal     int64
	convErr       error

	messages  []model.Message
	msgTotal  int64
	msgErr    error
	msgFilter *search.SearchFilter

	contacts     []model.Contact
	contactTotal int64
	contactErr   error

	companies    []model.Company
	companyTotal int64
	companyErr   error

	articles     []model.Article
	articleTotal int64
	articleErr   error
}

func (m *mockSearchRepo) SearchConversations(ctx context.Context, accountID uint, query string, filter *search.SearchFilter) ([]model.Conversation, int64, error) {
	return m.conversations, m.convTotal, m.convErr
}

func (m *mockSearchRepo) SearchMessages(ctx context.Context, accountID uint, query string, filter *search.SearchFilter) ([]model.Message, int64, error) {
	m.msgFilter = filter
	return m.messages, m.msgTotal, m.msgErr
}

func (m *mockSearchRepo) SearchContacts(ctx context.Context, accountID uint, query string, filter *search.SearchFilter) ([]model.Contact, int64, error) {
	return m.contacts, m.contactTotal, m.contactErr
}

func (m *mockSearchRepo) SearchCompanies(ctx context.Context, accountID uint, query string, filter *search.SearchFilter) ([]model.Company, int64, error) {
	return m.companies, m.companyTotal, m.companyErr
}

func (m *mockSearchRepo) SearchArticles(ctx context.Context, accountID uint, query string, filter *search.SearchFilter) ([]model.Article, int64, error) {
	return m.articles, m.articleTotal, m.articleErr
}

// Helper to create model objects without embedded Base in literals.
func makeConversation(accountID uint, status string) model.Conversation {
	return model.Conversation{AccountID: accountID, Status: status}
}

func makeMessage(accountID, conversationID uint, content string) model.Message {
	return model.Message{AccountID: accountID, ConversationID: conversationID, Content: content}
}

func makeContact(accountID uint, name string) model.Contact {
	return model.Contact{AccountID: accountID, Name: name}
}

func makeArticle(accountID, portalID uint, title, desc, content, status string) model.Article {
	return model.Article{AccountID: accountID, PortalID: portalID, Title: title, Description: desc, Content: content, Status: status}
}

// setupSearchHandlerRouter creates a test router with search handler routes.
func setupSearchHandlerRouter(h *SearchHandler) *gin.Engine {
	gin.SetMode(gin.TestMode)
	r := gin.New()

	api := r.Group("/api/v1/accounts/:account_id/search")
	{
		api.GET("", h.GlobalSearch)
		api.GET("/conversations", h.SearchConversations)
		api.GET("/messages", h.SearchMessages)
		api.GET("/contacts", h.SearchContacts)
		api.GET("/articles", h.SearchArticles)
	}

	return r
}

// ========== GlobalSearch handler tests ==========

func TestSearchHandler_GlobalSearch_Success(t *testing.T) {
	repo := &mockSearchRepo{
		conversations: []model.Conversation{makeConversation(1, "open")},
		convTotal:     1,
		messages:      []model.Message{makeMessage(1, 1, "hello")},
		msgTotal:      1,
		contacts:      []model.Contact{makeContact(1, "Alice")},
		contactTotal:  1,
		articles:      []model.Article{makeArticle(1, 1, "FAQ", "desc", "content", "published")},
		articleTotal:  1,
	}

	svc := search.NewSearchService(repo)
	handler := NewSearchHandler(svc)
	router := setupSearchHandlerRouter(handler)

	w := httptest.NewRecorder()
	req := httptest.NewRequest("GET", "/api/v1/accounts/1/search?q=test&page=1&per_page=10", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusOK, w.Code)

	var body map[string]interface{}
	assert.NoError(t, json.Unmarshal(w.Body.Bytes(), &body))
	require.NotContains(t, body, "success")
	payload, ok := body["payload"].(map[string]interface{})
	require.True(t, ok)
	assert.Len(t, payload["conversations"], 1)
	assert.Len(t, payload["contacts"], 1)
	assert.Len(t, payload["messages"], 1)
	assert.Len(t, payload["articles"], 1)
}

func TestSearchHandler_GlobalSearch_InvalidAccountID(t *testing.T) {
	repo := &mockSearchRepo{}
	svc := search.NewSearchService(repo)
	handler := NewSearchHandler(svc)
	router := setupSearchHandlerRouter(handler)

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

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

func TestSearchHandler_GlobalSearch_WithFilterParams(t *testing.T) {
	repo := &mockSearchRepo{
		conversations: []model.Conversation{makeConversation(1, "open")},
		convTotal:     1,
		messages:      []model.Message{makeMessage(1, 1, "msg")},
		msgTotal:      1,
		contacts:      []model.Contact{makeContact(1, "Bob")},
		contactTotal:  1,
		articles:      []model.Article{makeArticle(1, 1, "FAQ", "desc", "content", "published")},
		articleTotal:  1,
	}
	svc := search.NewSearchService(repo)
	handler := NewSearchHandler(svc)
	router := setupSearchHandlerRouter(handler)

	w := httptest.NewRecorder()
	req := httptest.NewRequest("GET", "/api/v1/accounts/1/search?q=test&status=open&page=2&per_page=5&sort_by=updated_at&sort_order=asc", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusOK, w.Code)

	var body map[string]interface{}
	assert.NoError(t, json.Unmarshal(w.Body.Bytes(), &body))
	require.NotContains(t, body, "success")
	payload, ok := body["payload"].(map[string]interface{})
	require.True(t, ok)
	assert.Len(t, payload["conversations"], 1)
}

// ========== SearchConversations handler tests ==========

func TestSearchHandler_SearchConversations_Success(t *testing.T) {
	repo := &mockSearchRepo{
		conversations: []model.Conversation{makeConversation(1, "open")},
		convTotal:     1,
	}
	svc := search.NewSearchService(repo)
	handler := NewSearchHandler(svc)
	router := setupSearchHandlerRouter(handler)

	w := httptest.NewRecorder()
	req := httptest.NewRequest("GET", "/api/v1/accounts/1/search/conversations?q=billing&page=1&per_page=10", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusOK, w.Code)

	var body map[string]interface{}
	assert.NoError(t, json.Unmarshal(w.Body.Bytes(), &body))
	require.NotContains(t, body, "success")
	payload, ok := body["payload"].(map[string]interface{})
	require.True(t, ok)
	results, ok := payload["conversations"].([]interface{})
	require.True(t, ok)
	require.Len(t, results, 1)
}

func TestSearchHandler_SearchConversations_InvalidAccountID(t *testing.T) {
	repo := &mockSearchRepo{}
	svc := search.NewSearchService(repo)
	handler := NewSearchHandler(svc)
	router := setupSearchHandlerRouter(handler)

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

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

func TestSearchHandler_SearchConversations_ServiceError(t *testing.T) {
	repo := &mockSearchRepo{convErr: assert.AnError}
	svc := search.NewSearchService(repo)
	handler := NewSearchHandler(svc)
	router := setupSearchHandlerRouter(handler)

	w := httptest.NewRecorder()
	req := httptest.NewRequest("GET", "/api/v1/accounts/1/search/conversations?q=test", nil)
	router.ServeHTTP(w, req)

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

// ========== SearchMessages handler tests ==========

func TestSearchHandler_SearchMessages_Success(t *testing.T) {
	repo := &mockSearchRepo{
		messages: []model.Message{makeMessage(1, 1, "hello world")},
		msgTotal: 1,
	}
	svc := search.NewSearchService(repo)
	handler := NewSearchHandler(svc)
	router := setupSearchHandlerRouter(handler)

	w := httptest.NewRecorder()
	req := httptest.NewRequest("GET", "/api/v1/accounts/1/search/messages?q=hello&page=1", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusOK, w.Code)

	var body map[string]interface{}
	assert.NoError(t, json.Unmarshal(w.Body.Bytes(), &body))
	require.NotContains(t, body, "success")
	payload, ok := body["payload"].(map[string]interface{})
	require.True(t, ok)
	results, ok := payload["messages"].([]interface{})
	require.True(t, ok)
	require.Len(t, results, 1)
	require.NotNil(t, repo.msgFilter)
	assert.Equal(t, 15, repo.msgFilter.PerPage)
}

func TestSearchHandler_SearchMessages_MeiliHitPayloadShape(t *testing.T) {
	svc := search.NewSearchServiceWithEngine(&stubSearchEngine{
		resp: &search.SearchResponse{
			Results: []search.SearchResult{{
				Type:      search.ResultTypeMessage,
				ID:        9,
				AccountID: 1,
				Data: map[string]any{
					"data": map[string]any{
						"message": map[string]any{
							"id":              float64(9),
							"content":         "hello from meili",
							"account_id":      float64(1),
							"conversation_id": float64(3),
							"message_type":    "incoming",
							"created_at_ts":   float64(1700000000),
						},
					},
				},
			}},
			ByType: map[string]int64{"message": 1},
		},
	}, nil)
	handler := NewSearchHandler(svc)
	router := setupSearchHandlerRouter(handler)

	w := httptest.NewRecorder()
	req := httptest.NewRequest("GET", "/api/v1/accounts/1/search/messages?q=hello", nil)
	router.ServeHTTP(w, req)

	require.Equal(t, http.StatusOK, w.Code)
	var body map[string]any
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &body))
	payload := body["payload"].(map[string]any)
	messages := payload["messages"].([]any)
	require.Len(t, messages, 1)
	message := messages[0].(map[string]any)
	assert.Equal(t, float64(0), message["message_type"])
	assert.Equal(t, float64(1700000000), message["created_at"])
}

func TestSearchHandler_SearchMessages_InvalidAccountID(t *testing.T) {
	repo := &mockSearchRepo{}
	svc := search.NewSearchService(repo)
	handler := NewSearchHandler(svc)
	router := setupSearchHandlerRouter(handler)

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

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

func TestSearchHandler_SearchMessages_ServiceError(t *testing.T) {
	repo := &mockSearchRepo{msgErr: assert.AnError}
	svc := search.NewSearchService(repo)
	handler := NewSearchHandler(svc)
	router := setupSearchHandlerRouter(handler)

	w := httptest.NewRecorder()
	req := httptest.NewRequest("GET", "/api/v1/accounts/1/search/messages?q=test", nil)
	router.ServeHTTP(w, req)

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

// ========== SearchContacts handler tests ==========

func TestSearchHandler_SearchContacts_Success(t *testing.T) {
	repo := &mockSearchRepo{
		contacts:     []model.Contact{makeContact(1, "Alice")},
		contactTotal: 1,
	}
	svc := search.NewSearchService(repo)
	handler := NewSearchHandler(svc)
	router := setupSearchHandlerRouter(handler)

	w := httptest.NewRecorder()
	req := httptest.NewRequest("GET", "/api/v1/accounts/1/search/contacts?q=Alice&page=1&per_page=10", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusOK, w.Code)

	var body map[string]interface{}
	assert.NoError(t, json.Unmarshal(w.Body.Bytes(), &body))
	require.NotContains(t, body, "success")
	payload, ok := body["payload"].(map[string]interface{})
	require.True(t, ok)
	results, ok := payload["contacts"].([]interface{})
	require.True(t, ok)
	require.Len(t, results, 1)
	contact := results[0].(map[string]interface{})
	assert.Equal(t, "Alice", contact["name"])
}

func TestSearchHandler_SearchContacts_InvalidAccountID(t *testing.T) {
	repo := &mockSearchRepo{}
	svc := search.NewSearchService(repo)
	handler := NewSearchHandler(svc)
	router := setupSearchHandlerRouter(handler)

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

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

func TestSearchHandler_SearchContacts_ServiceError(t *testing.T) {
	repo := &mockSearchRepo{contactErr: assert.AnError}
	svc := search.NewSearchService(repo)
	handler := NewSearchHandler(svc)
	router := setupSearchHandlerRouter(handler)

	w := httptest.NewRecorder()
	req := httptest.NewRequest("GET", "/api/v1/accounts/1/search/contacts?q=test", nil)
	router.ServeHTTP(w, req)

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

// ========== SearchArticles handler tests ==========

func TestSearchHandler_SearchArticles_Success(t *testing.T) {
	repo := &mockSearchRepo{
		articles:     []model.Article{makeArticle(1, 1, "FAQ Guide", "desc", "content", "published")},
		articleTotal: 1,
	}
	svc := search.NewSearchService(repo)
	handler := NewSearchHandler(svc)
	router := setupSearchHandlerRouter(handler)

	w := httptest.NewRecorder()
	req := httptest.NewRequest("GET", "/api/v1/accounts/1/search/articles?q=FAQ&page=1&per_page=10", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusOK, w.Code)

	var body map[string]interface{}
	assert.NoError(t, json.Unmarshal(w.Body.Bytes(), &body))
	require.NotContains(t, body, "success")
	payload, ok := body["payload"].(map[string]interface{})
	require.True(t, ok)
	results, ok := payload["articles"].([]interface{})
	require.True(t, ok)
	require.Len(t, results, 1)
}

func TestSearchHandler_SearchArticles_InvalidAccountID(t *testing.T) {
	repo := &mockSearchRepo{}
	svc := search.NewSearchService(repo)
	handler := NewSearchHandler(svc)
	router := setupSearchHandlerRouter(handler)

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

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

func TestSearchHandler_SearchArticles_ServiceError(t *testing.T) {
	repo := &mockSearchRepo{articleErr: assert.AnError}
	svc := search.NewSearchService(repo)
	handler := NewSearchHandler(svc)
	router := setupSearchHandlerRouter(handler)

	w := httptest.NewRecorder()
	req := httptest.NewRequest("GET", "/api/v1/accounts/1/search/articles?q=test", nil)
	router.ServeHTTP(w, req)

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

type stubSearchEngine struct {
	resp *search.SearchResponse
	err  error
}

func (s *stubSearchEngine) Search(ctx context.Context, accountID uint, query string, filter *search.SearchFilter) (*search.SearchResponse, error) {
	return s.resp, s.err
}

func (s *stubSearchEngine) IndexDocument(ctx context.Context, doc search.SearchDocument) error {
	return nil
}
func (s *stubSearchEngine) IndexBatch(ctx context.Context, docs []search.SearchDocument) error {
	return nil
}
func (s *stubSearchEngine) DeleteDocument(ctx context.Context, docType search.SearchResultType, accountID uint, id uint) error {
	return nil
}
func (s *stubSearchEngine) Bootstrap(ctx context.Context) error { return nil }
func (s *stubSearchEngine) Close() error                        { return nil }