package canned

import (
	"context"
	"testing"

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

func TestCannedResponseService_Create(t *testing.T) {
	provider := setupCannedTestDBProvider(t)
	accountID, _ := seedTestAccount(provider.DB(), t)
	svc := NewCannedResponseService(provider)

	cr := &CannedResponse{
		AccountID: accountID,
		ShortCode: "greeting",
		Content:   "Hello! How can I help you?",
	}

	if err := svc.Create(context.Background(), cr); err != nil {
		t.Fatalf("Create failed: %v", err)
	}

	if cr.ID == 0 {
		t.Fatal("expected ID to be set after Create")
	}
	if cr.ShortCode != "greeting" {
		t.Fatalf("expected ShortCode 'greeting', got '%s'", cr.ShortCode)
	}
	if cr.Content != "Hello! How can I help you?" {
		t.Fatalf("expected Content 'Hello! How can I help you?', got '%s'", cr.Content)
	}
}

func TestCannedResponseService_Create_DuplicateShortCode(t *testing.T) {
	provider := setupCannedTestDBProvider(t)
	accountID, _ := seedTestAccount(provider.DB(), t)
	svc := NewCannedResponseService(provider)

	cr1 := &CannedResponse{
		AccountID: accountID,
		ShortCode: "greeting",
		Content:   "Hello!",
	}
	if err := svc.Create(context.Background(), cr1); err != nil {
		t.Fatalf("first Create failed: %v", err)
	}

	// Same short_code within the same account should fail due to uniqueIndex.
	cr2 := &CannedResponse{
		AccountID: accountID,
		ShortCode: "greeting",
		Content:   "Hi there!",
	}
	if err := svc.Create(context.Background(), cr2); err == nil {
		t.Fatal("expected error on duplicate short_code, got nil")
	}
}

func TestCannedResponseService_GetByID(t *testing.T) {
	provider := setupCannedTestDBProvider(t)
	accountID, _ := seedTestAccount(provider.DB(), t)
	svc := NewCannedResponseService(provider)

	cr := &CannedResponse{
		AccountID: accountID,
		ShortCode: "thanks",
		Content:   "Thank you for contacting us!",
	}
	if err := svc.Create(context.Background(), cr); err != nil {
		t.Fatalf("Create failed: %v", err)
	}

	found, err := svc.GetByID(context.Background(), cr.ID)
	if err != nil {
		t.Fatalf("GetByID failed: %v", err)
	}
	if found.ID != cr.ID {
		t.Fatalf("expected ID %d, got %d", cr.ID, found.ID)
	}
	if found.ShortCode != "thanks" {
		t.Fatalf("expected ShortCode 'thanks', got '%s'", found.ShortCode)
	}
	if found.Content != "Thank you for contacting us!" {
		t.Fatalf("expected Content 'Thank you for contacting us!', got '%s'", found.Content)
	}
}

func TestCannedResponseService_GetByID_NotFound(t *testing.T) {
	provider := setupCannedTestDBProvider(t)
	svc := NewCannedResponseService(provider)

	_, err := svc.GetByID(context.Background(), 9999)
	if err == nil {
		t.Fatal("expected error for non-existent ID, got nil")
	}
}

func TestCannedResponseService_Update(t *testing.T) {
	provider := setupCannedTestDBProvider(t)
	accountID, _ := seedTestAccount(provider.DB(), t)
	svc := NewCannedResponseService(provider)

	cr := &CannedResponse{
		AccountID: accountID,
		ShortCode: "bye",
		Content:   "Goodbye!",
	}
	if err := svc.Create(context.Background(), cr); err != nil {
		t.Fatalf("Create failed: %v", err)
	}

	updates := map[string]interface{}{
		"short_code": "farewell",
		"content":    "Farewell and thank you!",
	}
	if err := svc.Update(context.Background(), cr.ID, updates); err != nil {
		t.Fatalf("Update failed: %v", err)
	}

	found, err := svc.GetByID(context.Background(), cr.ID)
	if err != nil {
		t.Fatalf("GetByID after Update failed: %v", err)
	}
	if found.ShortCode != "farewell" {
		t.Fatalf("expected ShortCode 'farewell', got '%s'", found.ShortCode)
	}
	if found.Content != "Farewell and thank you!" {
		t.Fatalf("expected Content 'Farewell and thank you!', got '%s'", found.Content)
	}
}

func TestCannedResponseService_Delete(t *testing.T) {
	provider := setupCannedTestDBProvider(t)
	accountID, _ := seedTestAccount(provider.DB(), t)
	svc := NewCannedResponseService(provider)

	cr := &CannedResponse{
		AccountID: accountID,
		ShortCode: "hello",
		Content:   "Hello!",
	}
	if err := svc.Create(context.Background(), cr); err != nil {
		t.Fatalf("Create failed: %v", err)
	}

	if err := svc.Delete(context.Background(), cr.ID); err != nil {
		t.Fatalf("Delete failed: %v", err)
	}

	// After soft delete, GetByID should return error.
	_, err := svc.GetByID(context.Background(), cr.ID)
	if err == nil {
		t.Fatal("expected error after Delete, got nil (soft-deleted record should not be found)")
	}
}

func TestCannedResponseService_ListByAccount(t *testing.T) {
	provider := setupCannedTestDBProvider(t)
	accountID, _ := seedTestAccount(provider.DB(), t)
	svc := NewCannedResponseService(provider)

	// Seed multiple canned responses.
	items := []CannedResponse{
		{AccountID: accountID, ShortCode: "alpha", Content: "Alpha content"},
		{AccountID: accountID, ShortCode: "beta", Content: "Beta content"},
		{AccountID: accountID, ShortCode: "gamma", Content: "Gamma content"},
	}
	for i := range items {
		if err := svc.Create(context.Background(), &items[i]); err != nil {
			t.Fatalf("Create #%d failed: %v", i, err)
		}
	}

	// Create a second account with its own canned response — should not appear.
	db := provider.DB()
	account2 := &model.Account{Name: "Other Account"}
	if err := db.Create(account2).Error; err != nil {
		t.Fatalf("failed to create second account: %v", err)
	}
	crOther := &CannedResponse{
		AccountID: account2.ID,
		ShortCode: "other",
		Content:   "Other account content",
	}
	if err := svc.Create(context.Background(), crOther); err != nil {
		t.Fatalf("Create other-account canned response failed: %v", err)
	}

	results, err := svc.ListByAccount(context.Background(), accountID)
	if err != nil {
		t.Fatalf("ListByAccount failed: %v", err)
	}

	if len(results) != 3 {
		t.Fatalf("expected 3 results, got %d", len(results))
	}

	// Results should be ordered by short_code ASC.
	if results[0].ShortCode != "alpha" {
		t.Fatalf("expected first result ShortCode 'alpha', got '%s'", results[0].ShortCode)
	}
	if results[1].ShortCode != "beta" {
		t.Fatalf("expected second result ShortCode 'beta', got '%s'", results[1].ShortCode)
	}
	if results[2].ShortCode != "gamma" {
		t.Fatalf("expected third result ShortCode 'gamma', got '%s'", results[2].ShortCode)
	}
}

func TestCannedResponseService_Search(t *testing.T) {
	provider := setupCannedTestDBProvider(t)
	accountID, _ := seedTestAccount(provider.DB(), t)
	svc := NewCannedResponseService(provider)

	items := []CannedResponse{
		{AccountID: accountID, ShortCode: "greet_hi", Content: "Hi there! Welcome."},
		{AccountID: accountID, ShortCode: "greet_hello", Content: "Hello! How can we help?"},
		{AccountID: accountID, ShortCode: "farewell", Content: "Goodbye and have a great day!"},
	}
	for i := range items {
		if err := svc.Create(context.Background(), &items[i]); err != nil {
			t.Fatalf("Create #%d failed: %v", i, err)
		}
	}

	// Search for "greet" — should match short_code on first two items.
	results, err := svc.Search(context.Background(), accountID, "greet")
	if err != nil {
		t.Fatalf("Search failed: %v", err)
	}

	// short_code matches should rank before content-only matches.
	// Both "greet_hi" and "greet_hello" match on short_code.
	if len(results) < 2 {
		t.Fatalf("expected at least 2 results for 'greet', got %d", len(results))
	}

	// Verify that short_code match results come first.
	for i := 0; i < 2; i++ {
		if results[i].ShortCode != "greet_hi" && results[i].ShortCode != "greet_hello" {
			t.Fatalf("expected short_code match in top results, got '%s'", results[i].ShortCode)
		}
	}

	// Search for "great" — matches content in "farewell".
	results2, err := svc.Search(context.Background(), accountID, "great")
	if err != nil {
		t.Fatalf("Search for 'great' failed: %v", err)
	}
	if len(results2) != 1 {
		t.Fatalf("expected 1 result for 'great', got %d", len(results2))
	}
	if results2[0].ShortCode != "farewell" {
		t.Fatalf("expected ShortCode 'farewell', got '%s'", results2[0].ShortCode)
	}

	// Empty query should return all (same as ListByAccount).
	results3, err := svc.Search(context.Background(), accountID, "")
	if err != nil {
		t.Fatalf("Search with empty query failed: %v", err)
	}
	if len(results3) != 3 {
		t.Fatalf("expected 3 results for empty query, got %d", len(results3))
	}
}

func TestCannedResponseService_GetByShortCode(t *testing.T) {
	provider := setupCannedTestDBProvider(t)
	accountID, _ := seedTestAccount(provider.DB(), t)
	svc := NewCannedResponseService(provider)

	cr := &CannedResponse{
		AccountID: accountID,
		ShortCode: "welcome",
		Content:   "Welcome to our service!",
	}
	if err := svc.Create(context.Background(), cr); err != nil {
		t.Fatalf("Create failed: %v", err)
	}

	found, err := svc.GetByShortCode(context.Background(), accountID, "welcome")
	if err != nil {
		t.Fatalf("GetByShortCode failed: %v", err)
	}
	if found.ID != cr.ID {
		t.Fatalf("expected ID %d, got %d", cr.ID, found.ID)
	}
	if found.ShortCode != "welcome" {
		t.Fatalf("expected ShortCode 'welcome', got '%s'", found.ShortCode)
	}

	// Non-existent short_code should return error.
	_, err = svc.GetByShortCode(context.Background(), accountID, "nonexistent")
	if err == nil {
		t.Fatal("expected error for non-existent short_code, got nil")
	}
}