package help

import (
	"strings"
	"testing"

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

// MockPlugin implements the Plugin interface for testing
type MockPlugin struct {
	id   string
	name string
	help string
}

func (m *MockPlugin) GetID() string   { return m.id }
func (m *MockPlugin) GetName() string { return m.name }
func (m *MockPlugin) GetHelp() string { return m.help }
func (m *MockPlugin) RequiresConfig() bool {
	return false
}
func (m *MockPlugin) OnMessage(msg *model.Message, config map[string]interface{}, cache model.CacheInterface) []*model.MessageAction {
	return nil
}

// MockDatabase implements the ChannelPluginGetter interface for testing
type MockDatabase struct {
	channelPlugins         map[int64][]*model.ChannelPlugin
	platformChannelPlugins map[string][]*model.ChannelPlugin // key: "platform:platformChannelID"
}

func (m *MockDatabase) GetChannelPlugins(channelID int64) ([]*model.ChannelPlugin, error) {
	if plugins, exists := m.channelPlugins[channelID]; exists {
		return plugins, nil
	}
	return nil, db.ErrNotFound
}

func (m *MockDatabase) GetChannelPluginsFromPlatformID(platform, platformChannelID string) ([]*model.ChannelPlugin, error) {
	key := platform + ":" + platformChannelID
	if plugins, exists := m.platformChannelPlugins[key]; exists {
		return plugins, nil
	}
	return nil, db.ErrNotFound
}

func TestHelpPlugin_OnMessage(t *testing.T) {
	tests := []struct {
		name             string
		messageText      string
		enabledPlugins   map[string]*MockPlugin
		expectResponse   bool
		expectNoPlugins  bool
		expectCategories []string
	}{
		{
			name:        "responds to !help command",
			messageText: "!help",
			enabledPlugins: map[string]*MockPlugin{
				"dev.ping": {
					id:   "dev.ping",
					name: "Ping",
					help: "Responds to 'ping' with 'pong'",
				},
				"fun.dice": {
					id:   "fun.dice",
					name: "Dice Roller",
					help: "Rolls dice when you type '!dice [formula]'",
				},
			},
			expectResponse:   true,
			expectCategories: []string{"Development", "Fun and Entertainment"},
		},
		{
			name:           "ignores non-help messages",
			messageText:    "hello world",
			enabledPlugins: map[string]*MockPlugin{},
			expectResponse: false,
		},
		{
			name:            "ignores case variation",
			messageText:     "!HELP",
			enabledPlugins:  map[string]*MockPlugin{},
			expectResponse:  true,
			expectNoPlugins: true,
		},
		{
			name:            "handles no enabled plugins",
			messageText:     "!help",
			enabledPlugins:  map[string]*MockPlugin{},
			expectResponse:  true,
			expectNoPlugins: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// Create mock database
			mockDB := &MockDatabase{
				channelPlugins:         make(map[int64][]*model.ChannelPlugin),
				platformChannelPlugins: make(map[string][]*model.ChannelPlugin),
			}

			// Setup channel plugins in mock database
			var channelPluginList []*model.ChannelPlugin
			pluginCounter := int64(1)
			for pluginID := range tt.enabledPlugins {
				channelPluginList = append(channelPluginList, &model.ChannelPlugin{
					ID:        pluginCounter,
					ChannelID: 1,
					PluginID:  pluginID,
					Enabled:   true,
					Config:    make(map[string]interface{}),
				})
				pluginCounter++
			}

			// Set up both mapping approaches for the test
			mockDB.channelPlugins[1] = channelPluginList
			mockDB.platformChannelPlugins["test:test-channel"] = channelPluginList

			// Create help plugin
			p := New(mockDB)

			// Create mock channel
			channel := &model.Channel{
				ID:                1,
				Platform:          "test",
				PlatformChannelID: "test-channel",
			}

			// Create test message
			msg := &model.Message{
				ID:      "test-msg",
				Text:    tt.messageText,
				Chat:    "test-chat",
				Channel: channel,
			}

			// Mock the plugin registry
			originalRegistry := plugin.GetAvailablePlugins()

			// Override the registry for this test
			plugin.ClearRegistry()
			for _, mockPlugin := range tt.enabledPlugins {
				plugin.Register(mockPlugin)
			}

			// Call OnMessage
			actions := p.OnMessage(msg, map[string]interface{}{}, nil)

			// Restore original registry
			plugin.ClearRegistry()
			for _, p := range originalRegistry {
				plugin.Register(p)
			}

			if !tt.expectResponse {
				if len(actions) != 0 {
					t.Errorf("Expected no response, but got %d actions", len(actions))
				}
				return
			}

			if len(actions) != 1 {
				t.Errorf("Expected 1 action, got %d", len(actions))
				return
			}

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

			responseText := action.Message.Text

			if tt.expectNoPlugins {
				if !strings.Contains(responseText, "No plugins are currently enabled") {
					t.Errorf("Expected 'no plugins' message, got: %s", responseText)
				}
				return
			}

			// Check that expected categories appear in response
			for _, category := range tt.expectCategories {
				if !strings.Contains(responseText, "**"+category+":**") {
					t.Errorf("Expected category '%s' in response, got: %s", category, responseText)
				}
			}

			// Check that plugin names and help text appear
			for _, mockPlugin := range tt.enabledPlugins {
				if !strings.Contains(responseText, mockPlugin.GetName()) {
					t.Errorf("Expected plugin name '%s' in response", mockPlugin.GetName())
				}
				if !strings.Contains(responseText, mockPlugin.GetHelp()) {
					t.Errorf("Expected plugin help '%s' in response", mockPlugin.GetHelp())
				}
			}
		})
	}
}