/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { useState, useCallback } from 'react';
import * as fs from 'node:fs/promises';
import path from 'node:path';
import { partListUnionToString, coreEvents } from '@google/gemini-cli-core';
import { MessageType, ToolCallStatus } from '../types.js';
export const useSessionBrowser = (config, onLoadHistory) => {
    const [isSessionBrowserOpen, setIsSessionBrowserOpen] = useState(false);
    return {
        isSessionBrowserOpen,
        openSessionBrowser: useCallback(() => {
            setIsSessionBrowserOpen(true);
        }, []),
        closeSessionBrowser: useCallback(() => {
            setIsSessionBrowserOpen(false);
        }, []),
        /**
         * Loads a conversation by ID, and reinitializes the chat recording service with it.
         */
        handleResumeSession: useCallback(async (session) => {
            try {
                const chatsDir = path.join(config.storage.getProjectTempDir(), 'chats');
                const fileName = session.fileName;
                const originalFilePath = path.join(chatsDir, fileName);
                // Load up the conversation.
                const conversation = JSON.parse(await fs.readFile(originalFilePath, 'utf8'));
                // Use the old session's ID to continue it.
                const existingSessionId = conversation.sessionId;
                config.setSessionId(existingSessionId);
                const resumedSessionData = {
                    conversation,
                    filePath: originalFilePath,
                };
                // We've loaded it; tell the UI about it.
                setIsSessionBrowserOpen(false);
                const historyData = convertSessionToHistoryFormats(conversation.messages);
                onLoadHistory(historyData.uiHistory, historyData.clientHistory, resumedSessionData);
            }
            catch (error) {
                coreEvents.emitFeedback('error', 'Error resuming session:', error);
                setIsSessionBrowserOpen(false);
            }
        }, [config, onLoadHistory]),
        /**
         * Deletes a session by ID using the ChatRecordingService.
         */
        handleDeleteSession: useCallback((session) => {
            // Note: Chat sessions are stored on disk using a filename derived from
            // the session, e.g. "session-<timestamp>-<sessionIdPrefix>.json".
            // The ChatRecordingService.deleteSession API expects this file basename
            // (without the ".json" extension), not the full session UUID.
            try {
                const chatRecordingService = config
                    .getGeminiClient()
                    ?.getChatRecordingService();
                if (chatRecordingService) {
                    chatRecordingService.deleteSession(session.file);
                }
            }
            catch (error) {
                coreEvents.emitFeedback('error', 'Error deleting session:', error);
                throw error;
            }
        }, [config]),
    };
};
/**
 * Converts session/conversation data into UI history and Gemini client history formats.
 */
export function convertSessionToHistoryFormats(messages) {
    const uiHistory = [];
    for (const msg of messages) {
        // Add the message only if it has content
        const contentString = partListUnionToString(msg.content);
        if (msg.content && contentString.trim()) {
            let messageType;
            switch (msg.type) {
                case 'user':
                    messageType = MessageType.USER;
                    break;
                case 'info':
                    messageType = MessageType.INFO;
                    break;
                case 'error':
                    messageType = MessageType.ERROR;
                    break;
                case 'warning':
                    messageType = MessageType.WARNING;
                    break;
                default:
                    messageType = MessageType.GEMINI;
                    break;
            }
            uiHistory.push({
                type: messageType,
                text: contentString,
            });
        }
        // Add tool calls if present
        if (msg.type !== 'user' &&
            'toolCalls' in msg &&
            msg.toolCalls &&
            msg.toolCalls.length > 0) {
            uiHistory.push({
                type: 'tool_group',
                tools: msg.toolCalls.map((tool) => ({
                    callId: tool.id,
                    name: tool.displayName || tool.name,
                    description: tool.description || '',
                    renderOutputAsMarkdown: tool.renderOutputAsMarkdown ?? true,
                    status: tool.status === 'success'
                        ? ToolCallStatus.Success
                        : ToolCallStatus.Error,
                    resultDisplay: tool.resultDisplay,
                    confirmationDetails: undefined,
                })),
            });
        }
    }
    // Convert to Gemini client history format
    const clientHistory = [];
    for (const msg of messages) {
        // Skip system/error messages and user slash commands
        if (msg.type === 'info' || msg.type === 'error' || msg.type === 'warning') {
            continue;
        }
        if (msg.type === 'user') {
            // Skip user slash commands
            const contentString = partListUnionToString(msg.content);
            if (contentString.trim().startsWith('/') ||
                contentString.trim().startsWith('?')) {
                continue;
            }
            // Add regular user message
            clientHistory.push({
                role: 'user',
                parts: [{ text: contentString }],
            });
        }
        else if (msg.type === 'gemini') {
            // Handle Gemini messages with potential tool calls
            const hasToolCalls = msg.toolCalls && msg.toolCalls.length > 0;
            if (hasToolCalls) {
                // Create model message with function calls
                const modelParts = [];
                // Add text content if present
                const contentString = partListUnionToString(msg.content);
                if (msg.content && contentString.trim()) {
                    modelParts.push({ text: contentString });
                }
                // Add function calls
                for (const toolCall of msg.toolCalls) {
                    modelParts.push({
                        functionCall: {
                            name: toolCall.name,
                            args: toolCall.args,
                            ...(toolCall.id && { id: toolCall.id }),
                        },
                    });
                }
                clientHistory.push({
                    role: 'model',
                    parts: modelParts,
                });
                // Create single function response message with all tool call responses
                const functionResponseParts = [];
                for (const toolCall of msg.toolCalls) {
                    if (toolCall.result) {
                        // Convert PartListUnion result to function response format
                        let responseData;
                        if (typeof toolCall.result === 'string') {
                            responseData = {
                                functionResponse: {
                                    id: toolCall.id,
                                    name: toolCall.name,
                                    response: {
                                        output: toolCall.result,
                                    },
                                },
                            };
                        }
                        else if (Array.isArray(toolCall.result)) {
                            // toolCall.result is an array containing properly formatted
                            // function responses
                            functionResponseParts.push(...toolCall.result);
                            continue;
                        }
                        else {
                            // Fallback for non-array results
                            responseData = toolCall.result;
                        }
                        functionResponseParts.push(responseData);
                    }
                }
                // Only add user message if we have function responses
                if (functionResponseParts.length > 0) {
                    clientHistory.push({
                        role: 'user',
                        parts: functionResponseParts,
                    });
                }
            }
            else {
                // Regular Gemini message without tool calls
                const contentString = partListUnionToString(msg.content);
                if (msg.content && contentString.trim()) {
                    clientHistory.push({
                        role: 'model',
                        parts: [{ text: contentString }],
                    });
                }
            }
        }
    }
    return {
        uiHistory,
        clientHistory,
    };
}
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