import * as vscode from 'vscode';
import * as path from 'path';
import { SidebarChatProvider } from '../sidebarProvider';
import { getActiveBrainProfile, logInfo } from '../utils';
import { pickConfigTarget } from '../lib/paths';

/**
 * Handles chat-domain messages: prompts, model selection, sessions, streaming control,
 * generic webview transport (export, settings, addMessage), action approvals, and the
 * cross-cutting `ready` bootstrap.
 *
 * Returns true when the message was handled by this domain, false otherwise — the
 * caller chains domain handlers until one accepts the message.
 */
export async function handleChatMessage(provider: SidebarChatProvider, data: any): Promise<boolean> {
    switch (data.type) {
        case 'prompt':
        case 'promptWithFile':
            provider._lmStudio?.activity.bump();
            await provider._context.globalState.update(SidebarChatProvider.blankChatStateKey, false);
            await provider._handlePrompt(data);
            await provider._autoWriteChronicleAfterPrompt();
            await provider._saveCurrentSession();
            return true;
        case 'activity':
            provider._lmStudio?.activity.bump();
            return true;
        case 'ready':
            await provider._sendBrainStatus();
            await provider._sendBrainProfiles();
            await provider._sendSessionList();
            await provider._sendModels();
            await provider._sendChronicleProjects();
            await provider._restoreActiveSessionIntoView();
            await provider._sendReadyStatus();
            return true;
        case 'getReadyStatus':
            await provider._sendReadyStatus();
            return true;
        case 'createLessonFromConversation':
            await vscode.commands.executeCommand('g1nation.lesson.fromConversation');
            return true;
        case 'manageLessons':
            await vscode.commands.executeCommand('g1nation.lesson.manage');
            return true;
        case 'getModels':
            await provider._sendModels();
            return true;
        case 'getSessions':
            await provider._sendSessionList();
            return true;
        case 'newChat':
            provider._currentSessionId = null;
            provider._currentSessionBrainId = getActiveBrainProfile().id;
            provider._agent.resetConversation();
            await provider._context.globalState.update(SidebarChatProvider.activeSessionStateKey, null);
            await provider._context.globalState.update(SidebarChatProvider.lastVisibleChatStateKey, null);
            await provider._context.globalState.update(SidebarChatProvider.blankChatStateKey, true);
            provider.clearChat();
            await provider._sendBrainStatus();
            return true;
        case 'stopGeneration':
            provider._agent.stop();
            return true;
        case 'loadSession':
            await provider._loadSession(data.id);
            return true;
        case 'deleteSession':
            await provider._deleteSession(data.id);
            return true;
        case 'openSettings':
            // Route the sidebar gear button to Astra's own settings webview.
            // Falls back to VS Code Settings if the view hasn't registered yet
            // (e.g. during the very first activation pass) and surfaces any
            // unexpected error so the user isn't stuck with a silent button.
            try {
                await vscode.commands.executeCommand('g1nation.settings.focus');
            } catch (e: any) {
                logInfo('openSettings: settings.focus failed, falling back to VS Code Settings.', { error: e?.message ?? String(e) });
                try {
                    await vscode.commands.executeCommand('workbench.action.openSettings', 'g1nation');
                } catch (e2: any) {
                    vscode.window.showErrorMessage(`Astra Settings 열기 실패: ${e2?.message ?? e2}`);
                }
            }
            return true;
        case 'addMessage':
            provider._view?.webview.postMessage({ type: 'addMessage', role: data.role, value: data.value, rationale: data.rationale });
            return true;
        case 'refreshModels':
            await provider._sendModels(true);
            return true;
        case 'model': {
            // Write to whichever scope already holds the value so a stale
            // Workspace override doesn't shadow our Global update — that was
            // the "sidebar shows e2b but Settings shows e4b" desync.
            const { target } = pickConfigTarget('g1nation', 'defaultModel');
            await vscode.workspace.getConfiguration('g1nation').update('defaultModel', data.value, target);
            logInfo(`Default model updated to: ${data.value}`, { target });
            provider._lmStudio?.lifecycle.onModelSelected(data.value);
            return true;
        }
        case 'proactiveTrigger':
            await provider._handleProactiveSuggestion(data.context);
            return true;
        case 'exportResponse': {
            const workspacePath = vscode.workspace.workspaceFolders?.[0].uri.fsPath || '';
            const defaultPath = path.join(workspacePath, 'g1_response.md');
            const uri = await vscode.window.showSaveDialog({
                defaultUri: vscode.Uri.file(defaultPath),
                filters: { 'Markdown': ['md'] }
            });
            if (uri) {
                await vscode.workspace.fs.writeFile(uri, Buffer.from(data.text, 'utf8'));
                vscode.window.showInformationMessage(`✅ Exported to ${path.basename(uri.fsPath)}`);
            }
            return true;
        }
        case 'approveAction':
            await provider._agent.approveTransaction();
            return true;
        case 'rejectAction':
            await provider._agent.rejectTransaction();
            return true;
        default:
            return false;
    }
}