package searchreplace

import (
	"testing"
	"time"

	"git.nakama.town/fmartingr/butterrobot/internal/model"
)

func TestSearchReplace(t *testing.T) {
	// Create plugin instance
	p := New()

	// Test cases
	tests := []struct {
		name           string
		command        string
		originalText   string
		expectedResult string
		expectActions  bool
	}{
		{
			name:           "Simple replacement",
			command:        "s/hello/world/",
			originalText:   "hello everyone",
			expectedResult: "world everyone",
			expectActions:  true,
		},
		{
			name:           "Case-insensitive replacement",
			command:        "s/HELLO/world/i",
			originalText:   "Hello everyone",
			expectedResult: "world everyone",
			expectActions:  true,
		},
		{
			name:           "Global replacement",
			command:        "s/a/X/g",
			originalText:   "banana",
			expectedResult: "bXnXnX",
			expectActions:  true,
		},
		{
			name:           "No change",
			command:        "s/nothing/something/",
			originalText:   "test message",
			expectedResult: "test message",
			expectActions:  true, // We send a "no changes" message
		},
		{
			name:           "Not a search/replace command",
			command:        "hello",
			originalText:   "test message",
			expectedResult: "",
			expectActions:  false,
		},
		{
			name:           "Invalid pattern",
			command:        "s/(/)/",
			originalText:   "test message",
			expectedResult: "error",
			expectActions:  true, // We send an error message
		},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			// Create message
			msg := &model.Message{
				Text:    tc.command,
				Chat:    "test-chat",
				ReplyTo: "original-message-id",
				Date:    time.Now(),
				Channel: &model.Channel{
					Platform: "test",
				},
				Raw: map[string]interface{}{
					"message": map[string]interface{}{
						"reply_to_message": map[string]interface{}{
							"text": tc.originalText,
						},
					},
				},
			}

			// Process message
			actions := p.OnMessage(msg, nil)

			// Check results
			if tc.expectActions {
				if len(actions) == 0 {
					t.Fatalf("Expected actions but got none")
				}

				action := actions[0]
				if action.Type != model.ActionSendMessage {
					t.Fatalf("Expected send message action but got %v", action.Type)
				}

				if tc.expectedResult == "error" {
					// Just checking that we got an error message
					if action.Message == nil || action.Message.Text == "" {
						t.Fatalf("Expected error message but got empty message")
					}
				} else if tc.originalText == tc.expectedResult {
					// Check if we got the "no changes" message
					if action.Message == nil || action.Message.Text != "No changes were made to the original message." {
						t.Fatalf("Expected 'no changes' message but got: %s", action.Message.Text)
					}
				} else {
					// Check actual replacement result
					if action.Message == nil || action.Message.Text != tc.expectedResult {
						t.Fatalf("Expected result: %s, got: %s", tc.expectedResult, action.Message.Text)
					}
				}
			} else if len(actions) > 0 {
				t.Fatalf("Expected no actions but got %d", len(actions))
			}
		})
	}
}

func TestPerformReplacement(t *testing.T) {
	p := New()

	// Test cases for the performReplacement function
	tests := []struct {
		name      string
		text      string
		search    string
		replace   string
		flags     string
		expected  string
		expectErr bool
	}{
		{
			name:      "Simple replacement",
			text:      "Hello World",
			search:    "Hello",
			replace:   "Hi",
			flags:     "",
			expected:  "Hi World",
			expectErr: false,
		},
		{
			name:      "Case insensitive",
			text:      "Hello World",
			search:    "hello",
			replace:   "Hi",
			flags:     "i",
			expected:  "Hi World",
			expectErr: false,
		},
		{
			name:      "Global replacement",
			text:      "one two one two",
			search:    "one",
			replace:   "1",
			flags:     "g",
			expected:  "1 two 1 two",
			expectErr: false,
		},
		{
			name:      "No match",
			text:      "Hello World",
			search:    "Goodbye",
			replace:   "Hi",
			flags:     "",
			expected:  "Hello World",
			expectErr: false,
		},
		{
			name:      "Invalid regex",
			text:      "Hello World",
			search:    "(",
			replace:   "Hi",
			flags:     "n", // treat as regex
			expected:  "",
			expectErr: true,
		},
		{
			name:      "Escape special chars by default",
			text:      "Hello (World)",
			search:    "(World)",
			replace:   "[Earth]",
			flags:     "",
			expected:  "Hello [Earth]",
			expectErr: false,
		},
		{
			name:      "Regex mode with n flag",
			text:      "Hello (World)",
			search:    "\\(World\\)",
			replace:   "[Earth]",
			flags:     "n",
			expected:  "Hello [Earth]",
			expectErr: false,
		},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			result, err := p.performReplacement(tc.text, tc.search, tc.replace, tc.flags)

			if tc.expectErr {
				if err == nil {
					t.Fatalf("Expected error but got none")
				}
			} else if err != nil {
				t.Fatalf("Unexpected error: %v", err)
			} else if result != tc.expected {
				t.Fatalf("Expected result: %s, got: %s", tc.expected, result)
			}
		})
	}
}