// ==========================================
// Chat Surface — SidebarChats Component
// ==========================================
// Personal AI chats with folder grouping and context menus.

const html = window.html;
const { useState, useCallback, useRef, useEffect } = window.hooks;

const CHEVRON_SVG = html`
    <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor"
         stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round">
        <polyline points="9 18 15 12 9 6"/>
    </svg>`;

const CHAT_SVG = html`
    <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor"
         stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
        <path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z"/>
    </svg>`;

const FOLDER_SVG = html`
    <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor"
         stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
        <path d="M22 19a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h5l2 3h9a2 2 0 0 1 2 2z"/>
    </svg>`;

const DOTS_SVG = html`
    <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor"
         stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
        <circle cx="12" cy="12" r="1"/><circle cx="12" cy="5" r="1"/><circle cx="12" cy="19" r="1"/>
    </svg>`;

/**
 * @param {{
 *   chatsByFolder: Record<string, Array>,
 *   folders: Array<{id: string, name: string}>,
 *   activeId: string|null,
 *   collapsed: boolean,
 *   onToggle: () => void,
 *   onSelect: (id: string) => void,
 *   onRename: (id: string, title: string) => void,
 *   onDelete: (id: string) => void,
 *   onMoveToFolder: (chatId: string, folderId: string|null) => void,
 *   onCreateFolder: (name: string) => void,
 *   onRenameFolder: (id: string, name: string) => void,
 *   onDeleteFolder: (id: string) => void,
 * }} props
 */
export function SidebarChats({
    chatsByFolder, folders, activeId, collapsed, onToggle, onSelect,
    onRename, onDelete, onMoveToFolder, onCreateFolder,
    onRenameFolder, onDeleteFolder,
}) {
    const [contextMenu, setContextMenu] = useState(null);
    const menuRef = useRef(null);

    // Close context menu on outside click or Escape
    useEffect(() => {
        if (!contextMenu) return;
        function _close(e) {
            if (e.type === 'keydown' && e.key !== 'Escape') return;
            if (e.type === 'click' && menuRef.current?.contains(e.target)) return;
            setContextMenu(null);
        }
        document.addEventListener('click', _close);
        document.addEventListener('keydown', _close);
        return () => {
            document.removeEventListener('click', _close);
            document.removeEventListener('keydown', _close);
        };
    }, [contextMenu]);

    const _openMenu = useCallback((e, type, item) => {
        e.preventDefault();
        e.stopPropagation();
        const rect = e.currentTarget.getBoundingClientRect();
        setContextMenu({ type, item, x: rect.right, y: rect.bottom });
    }, []);

    const _action = useCallback(async (action, item) => {
        setContextMenu(null);
        if (action === 'rename') {
            const newTitle = prompt('Rename:', item.title || item.name || '');
            if (newTitle && newTitle.trim()) {
                if (item.name !== undefined) await onRenameFolder(item.id, newTitle.trim());
                else await onRename(item.id, newTitle.trim());
            }
        } else if (action === 'delete') {
            const label = item.name !== undefined ? 'folder' : 'chat';
            if (confirm('Delete this ' + label + '?')) {
                if (item.name !== undefined) await onDeleteFolder(item.id);
                else await onDelete(item.id);
            }
        } else if (action === 'move-out') {
            await onMoveToFolder(item.id, null);
        } else if (action === 'new-folder') {
            const name = prompt('Folder name:');
            if (name && name.trim()) await onCreateFolder(name.trim());
        } else if (action.startsWith('move-to:')) {
            const fid = action.slice(8);
            await onMoveToFolder(item.id, fid);
        }
    }, [onRename, onDelete, onMoveToFolder, onCreateFolder, onRenameFolder, onDeleteFolder]);

    // Count total chats
    const totalChats = Object.values(chatsByFolder).reduce((sum, arr) => sum + arr.length, 0);
    const unfolderedChats = chatsByFolder[''] || [];

    return html`
        <div class="sw-chat-surface__section">
            <button class="sw-chat-surface__section-header"
                    onClick=${onToggle}
                    aria-expanded=${!collapsed}>
                <span class=${'sw-chat-surface__chevron' + (collapsed ? '' : ' sw-chat-surface__chevron--open')}>
                    ${CHEVRON_SVG}
                </span>
                <span class="sw-chat-surface__section-label">Chats</span>
                ${totalChats > 0 && html`
                    <span class="sw-chat-surface__section-count">${totalChats}</span>`}
            </button>
            ${!collapsed && html`
                <div class="sw-chat-surface__section-body" role="listbox">
                    ${/* Folders first */''}
                    ${folders.map(folder => {
                        const folderChats = chatsByFolder[folder.id] || [];
                        return html`
                            <div key=${'f-' + folder.id} class="sw-chat-surface__folder">
                                <div class="sw-chat-surface__folder-header">
                                    <span class="sw-chat-surface__item-icon">${FOLDER_SVG}</span>
                                    <span class="sw-chat-surface__folder-name">${folder.name}</span>
                                    <span class="sw-chat-surface__folder-count">${folderChats.length}</span>
                                    <button class="sw-chat-surface__item-menu"
                                            onClick=${(e) => _openMenu(e, 'folder', folder)}
                                            title="Folder actions"
                                            aria-label="Folder actions">
                                        ${DOTS_SVG}
                                    </button>
                                </div>
                                ${folderChats.map(ch => html`
                                    <${ChatItem} key=${ch.id} chat=${ch} activeId=${activeId}
                                                  onSelect=${onSelect} onOpenMenu=${_openMenu}
                                                  indent=${true} />`)}
                            </div>`;
                    })}
                    ${/* Unfoldered chats */''}
                    ${unfolderedChats.map(ch => html`
                        <${ChatItem} key=${ch.id} chat=${ch} activeId=${activeId}
                                      onSelect=${onSelect} onOpenMenu=${_openMenu} />`)}
                    ${totalChats === 0 && html`
                        <div class="sw-chat-surface__empty">No chats yet</div>`}
                </div>`}

            ${/* Context Menu */''}
            ${contextMenu && html`
                <div class="sw-chat-surface__context-menu" ref=${menuRef}
                     style=${'left:' + contextMenu.x + 'px;top:' + contextMenu.y + 'px;'}>
                    ${contextMenu.type === 'chat' && html`
                        <button onClick=${() => _action('rename', contextMenu.item)}>Rename</button>
                        ${folders.length > 0 && folders.map(f => html`
                            <button key=${f.id} onClick=${() => _action('move-to:' + f.id, contextMenu.item)}>
                                Move to ${f.name}
                            </button>`)}
                        ${contextMenu.item.folder_id && html`
                            <button onClick=${() => _action('move-out', contextMenu.item)}>Remove from folder</button>`}
                        <button class="sw-chat-surface__ctx-danger"
                                onClick=${() => _action('delete', contextMenu.item)}>Delete</button>
                    `}
                    ${contextMenu.type === 'folder' && html`
                        <button onClick=${() => _action('rename', contextMenu.item)}>Rename</button>
                        <button class="sw-chat-surface__ctx-danger"
                                onClick=${() => _action('delete', contextMenu.item)}>Delete</button>
                    `}
                </div>`}
        </div>`;
}

function ChatItem({ chat, activeId, onSelect, onOpenMenu, indent }) {
    return html`
        <button class=${'sw-chat-surface__item' + (chat.id === activeId ? ' sw-chat-surface__item--active' : '') + (indent ? ' sw-chat-surface__item--indent' : '')}
                onClick=${() => onSelect(chat.id)}
                onContextMenu=${(e) => { e.preventDefault(); onOpenMenu(e, 'chat', chat); }}
                role="option"
                aria-selected=${chat.id === activeId}
                title=${chat.title || 'Untitled'}>
            <span class="sw-chat-surface__item-icon">${CHAT_SVG}</span>
            <span class="sw-chat-surface__item-title">${chat.title || 'Untitled'}</span>
            <button class="sw-chat-surface__item-menu"
                    onClick=${(e) => _stopAndOpen(e, onOpenMenu, 'chat', chat)}
                    title="Chat actions"
                    aria-label="Chat actions">
                ${DOTS_SVG}
            </button>
        </button>`;
}

function _stopAndOpen(e, onOpenMenu, type, item) {
    e.stopPropagation();
    onOpenMenu(e, type, item);
}