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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>DuckDB Explorer</title>
    <style>
        /* --- THEME VARIABLES --- */
        :root {
            --bg-color: #f4f7f6;
            --text-color: #333;
            --header-bg: #4CAF50;
            --header-text: white;
            --sidebar-bg: #e9ecef;
            --sidebar-text: #495057;
            --sidebar-hover-bg: #d4dadf;
            --sidebar-active-bg: #007bff;
            --sidebar-active-text: white;
            --content-bg: #fff;
            --border-color: #dee2e6;
            --border-color-light: #e9ecef;
            --table-header-bg: #f8f9fa;
            --table-row-even-bg: #fdfdfe;
            --button-primary-bg: #28a745;
            --button-primary-hover-bg: #218838;
            --button-primary-text: white;
            --status-success-bg: #d1e7dd;
            --status-success-text: #0f5132;
            --status-success-border: #badbcc;
            --status-error-bg: #f8d7da;
            --status-error-text: #842029;
            --status-error-border: #f5c2c7;
            /* --loader-border: #f3f3f3; */ /* No longer needed */
            /* --loader-spinner: #007bff; */ /* No longer needed */
            --input-border: #ced4da;
            --input-bg: #fff;
            --link-color: #007bff;
        }

        @media (prefers-color-scheme: dark) {
            :root {
                --bg-color: #1a1a1a;
                --text-color: #e8e8e8;
                --header-bg: #2a622d;
                --header-text: #e8e8e8;
                --sidebar-bg: #2c2c2c;
                --sidebar-text: #adb5bd;
                --sidebar-hover-bg: #444;
                --sidebar-active-bg: #0056b3;
                --sidebar-active-text: white;
                --content-bg: #212121;
                --border-color: #444;
                --border-color-light: #333;
                --table-header-bg: #2c2c2c;
                --table-row-even-bg: #252525;
                --button-primary-bg: #218838;
                --button-primary-hover-bg: #1e7e34;
                --button-primary-text: white;
                --status-success-bg: #143620;
                --status-success-text: #a3cfbb;
                --status-success-border: #2a622d;
                --status-error-bg: #58151c;
                --status-error-text: #f5c6cb;
                --status-error-border: #842029;
                /* --loader-border: #444; */ /* No longer needed */
                /* --loader-spinner: #4dabf7; */ /* No longer needed */
                --input-border: #555;
                --input-bg: #333;
                --link-color: #4dabf7;
            }
            input[type="text"], textarea {
                color: var(--text-color);
                background-color: var(--input-bg);
            }
             th, td {
                color: var(--text-color);
             }
            ::placeholder { color: #888; opacity: 1; }
            :-ms-input-placeholder { color: #888; }
            ::-ms-input-placeholder { color: #888; }
        }

        /* --- General Styles --- */
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            margin: 0; padding: 0; display: flex; flex-direction: column; height: 100vh;
            background-color: var(--bg-color); color: var(--text-color);
            transition: background-color 0.3s, color 0.3s;
        }
        a { color: var(--link-color); }

        /* --- Header --- */
        header {
            background-color: var(--header-bg); color: var(--header-text); padding: 15px 20px;
            display: flex; align-items: center; box-shadow: 0 2px 4px rgba(0,0,0,0.1);
            font-size: 1.2em; font-weight: bold; transition: background-color 0.3s, color 0.3s;
        }
         /* Removed header .loader styling */

        /* --- Container, Sidebar, Main Content (Keep as before) --- */
         .container { display: flex; flex: 1; overflow: hidden; }
         #sidebar { width: 220px; background-color: var(--sidebar-bg); padding: 15px; overflow-y: auto; border-right: 1px solid var(--border-color); transition: background-color 0.3s; }
         #sidebar h3 { margin-top: 0; margin-bottom: 15px; color: var(--sidebar-text); border-bottom: 1px solid var(--border-color); padding-bottom: 10px; }
         #tableList { list-style: none; padding: 0; margin: 0; }
         #tableList li { padding: 8px 10px; cursor: pointer; border-radius: 4px; margin-bottom: 5px; transition: background-color 0.2s, color 0.2s; font-size: 0.95em; color: var(--sidebar-text); }
         #tableList li:hover { background-color: var(--sidebar-hover-bg); }
         #tableList li.active { background-color: var(--sidebar-active-bg); color: var(--sidebar-active-text); font-weight: bold; }
         #mainContent { flex: 1; display: flex; flex-direction: column; padding: 20px; overflow: hidden; }
         .content-area { flex: 1; display: flex; flex-direction: column; overflow: hidden; gap: 15px; }
         #schemaDisplay, #dataDisplayContainer, #queryResultContainer { background-color: var(--content-bg); border: 1px solid var(--border-color); border-radius: 5px; padding: 15px; margin-bottom: 0; overflow: auto; box-shadow: 0 1px 3px rgba(0,0,0,0.05); transition: background-color 0.3s, border-color 0.3s; }
         #schemaDisplay h4, #dataDisplayContainer h4, #queryResultContainer h4 { margin-top: 0; color: var(--sidebar-text); border-bottom: 1px solid var(--border-color-light); padding-bottom: 10px; margin-bottom: 15px; }
         #dataDisplayContainer { flex: 1; display: flex; flex-direction: column; }
         #dataDisplay { flex: 1; overflow: auto; min-height: 100px; }
         #schemaDisplay p, #dataDisplayContainer p { color: #888; }

        /* --- Query Area (Keep as before) --- */
        #queryArea { padding-top: 20px; border-top: 1px solid var(--border-color); background-color: var(--content-bg); padding: 15px; border-radius: 5px; box-shadow: 0 -1px 3px rgba(0,0,0,0.05); margin-top: 15px; transition: background-color 0.3s, border-color 0.3s; }
         #queryArea h4 { margin-top: 0; margin-bottom: 10px; color: var(--sidebar-text); }
        #queryArea textarea { width: 100%; min-height: 80px; padding: 10px; border: 1px solid var(--input-border); border-radius: 4px; box-sizing: border-box; font-family: monospace; margin-bottom: 10px; resize: vertical; background-color: var(--input-bg); color: var(--text-color); transition: background-color 0.3s, border-color 0.3s, color 0.3s; }
        #queryArea button { padding: 10px 20px; background-color: var(--button-primary-bg); color: var(--button-primary-text); border: none; border-radius: 4px; cursor: pointer; transition: background-color 0.2s; font-weight: bold; }
        #queryArea button:hover { background-color: var(--button-primary-hover-bg); }

        /* --- Tables (Keep as before) --- */
        table { width: 100%; border-collapse: collapse; margin-top: 0; font-size: 0.9em; }
        th, td { border: 1px solid var(--border-color-light); padding: 10px 12px; text-align: left; white-space: nowrap; max-width: 250px; overflow: hidden; text-overflow: ellipsis; color: var(--text-color); transition: border-color 0.3s; }
        th { background-color: var(--table-header-bg); font-weight: 600; position: sticky; top: 0; z-index: 1; transition: background-color 0.3s; }
        tr:nth-child(even) { background-color: var(--table-row-even-bg); transition: background-color 0.3s; }
         tr:nth-child(odd) { background-color: var(--content-bg); transition: background-color 0.3s; }

         /* --- Status Message (Keep as before) --- */
         #statusMessage { padding: 10px 15px; margin-top: 15px; border-radius: 4px; display: none; font-size: 0.9em; transition: background-color 0.3s, color 0.3s, border-color 0.3s; }
        #statusMessage.success { background-color: var(--status-success-bg); color: var(--status-success-text); border: 1px solid var(--status-success-border); }
        #statusMessage.error { background-color: var(--status-error-bg); color: var(--status-error-text); border: 1px solid var(--status-error-border); }

         /* Removed .loader and @keyframes spin styling */
    </style>
</head>
<body>

    <header>
        <span>🦆 DuckDB Explorer</span>
         <!-- Removed loader div -->
    </header>

    <div class="container">
        <aside id="sidebar">
            <h3>Tables</h3>
            <ul id="tableList">
                <li>Loading...</li>
            </ul>
        </aside>

        <main id="mainContent">
            <div class="content-area">
                <div id="schemaDisplay">
                    <h4>Schema</h4>
                    <p id="schemaPlaceholder">Select a table from the list.</p>
                    <table id="schemaTable"></table>
                </div>
                <div id="dataDisplayContainer">
                     <h4>Data <span id="tableDataHeader"></span></h4>
                     <p id="dataPlaceholder">Select a table from the list.</p>
                    <div id="dataDisplay">
                        <table id="dataTable"></table>
                    </div>
                </div>
                <div id="queryResultContainer" style="display: none;">
                     <h4>Query Result</h4>
                     <div id="queryResultDisplay">
                        <table id="queryResultTable"></table>
                    </div>
                </div>
            </div>

            <div id="queryArea">
                <h4>Custom SQL Query (SELECT/SHOW/PRAGMA only)</h4>
                <textarea id="sqlInput" placeholder="Enter your SELECT query here... e.g., SELECT * FROM table_name LIMIT 10"></textarea>
                <button id="runSqlButton">Run SQL</button>
            </div>

             <div id="statusMessage"></div>
        </main>
    </div>

    <script>
        // --- Keep the existing element variables EXCEPT loadingIndicator ---
        const tableList = document.getElementById('tableList');
        const schemaDisplay = document.getElementById('schemaDisplay');
        const schemaTable = document.getElementById('schemaTable');
        const schemaPlaceholder = document.getElementById('schemaPlaceholder');
        const dataDisplayContainer = document.getElementById('dataDisplayContainer');
        const dataDisplay = document.getElementById('dataDisplay');
        const dataTable = document.getElementById('dataTable');
        const dataPlaceholder = document.getElementById('dataPlaceholder');
        const tableDataHeader = document.getElementById('tableDataHeader');
        const sqlInput = document.getElementById('sqlInput');
        const runSqlButton = document.getElementById('runSqlButton');
        const queryResultContainer = document.getElementById('queryResultContainer');
        const queryResultDisplay = document.getElementById('queryResultDisplay');
        const queryResultTable = document.getElementById('queryResultTable');
        const statusMessage = document.getElementById('statusMessage');
        // const loadingIndicator = document.getElementById('loadingIndicator'); // Removed

        // --- API URL, currentTables, selectedTable, polling (Keep as before) ---
        const API_BASE_URL = '';
        let currentTables = [];
        let selectedTable = null;
        let pollingIntervalId = null;
        const POLLING_INTERVAL_MS = 10000;

        // --- Utility Functions ---
        // --- REMOVE showLoader function ---
        // function showLoader(show) {
        //     loadingIndicator.style.display = show ? 'inline-block' : 'none';
        // }

        // --- Keep showStatus, clearStatus ---
         function showStatus(message, isError = false) {
             statusMessage.textContent = message;
             statusMessage.className = isError ? 'error' : 'success';
             statusMessage.style.display = 'block';
             setTimeout(() => { statusMessage.style.display = 'none'; }, 5000);
         }
         function clearStatus() {
             statusMessage.textContent = '';
             statusMessage.style.display = 'none';
         }

        async function fetchAPI(endpoint, options = {}) {
            // REMOVE showLoader(true);
            clearStatus();
            const url = `${API_BASE_URL}${endpoint}`;
            try {
                const response = await fetch(url, options);
                if (!response.ok) {
                    let errorDetail = `HTTP error! status: ${response.status}`;
                    try {
                        const errorJson = await response.json();
                        errorDetail += ` - ${errorJson.detail || JSON.stringify(errorJson)}`;
                    } catch (e) { /* Ignore */ }
                    throw new Error(errorDetail);
                }
                 const contentType = response.headers.get("content-type");
                 if (contentType && contentType.includes("application/json")) {
                     return await response.json();
                 }
                 return await response.text();
            } catch (error) {
                console.error('API Fetch Error:', error);
                showStatus(`Error: ${error.message}`, true);
                throw error;
            } finally {
                // REMOVE showLoader(false);
            }
        }

        // --- Keep renderTable, renderSchema ---
        function renderTable(data, tableElement) {
            tableElement.innerHTML = '';
             if (!data || !Array.isArray(data)) {
                 tableElement.innerHTML = '<tbody><tr><td>Invalid data format received.</td></tr></tbody>';
                 console.error("Invalid data format for renderTable:", data);
                 return;
             }
            if (data.length === 0) {
                tableElement.innerHTML = '<tbody><tr><td>No data available.</td></tr></tbody>';
                return;
            }
            const headers = Object.keys(data[0]);
            const thead = tableElement.createTHead();
            const headerRow = thead.insertRow();
            headers.forEach(headerText => {
                const th = document.createElement('th');
                th.textContent = headerText;
                headerRow.appendChild(th);
            });
            const tbody = tableElement.createTBody();
            data.forEach(rowData => {
                const row = tbody.insertRow();
                headers.forEach(header => {
                    const cell = row.insertCell();
                    const value = rowData[header];
                    cell.textContent = (value === null || value === undefined) ? 'NULL' : String(value);
                 });
            });
        }
         function renderSchema(schemaData) {
             schemaTable.innerHTML = '';
             schemaPlaceholder.style.display = 'none';

            if (!schemaData || !schemaData.columns || schemaData.columns.length === 0) {
                schemaTable.innerHTML = '<tbody><tr><td colspan="2">No schema information available.</td></tr></tbody>';
                return;
            }

            const thead = schemaTable.createTHead();
            const headerRow = thead.insertRow();
            ['Name', 'Type'].forEach(headerText => {
                const th = document.createElement('th');
                th.textContent = headerText;
                headerRow.appendChild(th);
            });

            const tbody = schemaTable.createTBody();
            schemaData.columns.forEach(column => {
                const row = tbody.insertRow();
                row.insertCell().textContent = column.name;
                row.insertCell().textContent = column.type;
            });
         }


        // --- Event Handlers (Keep and ensure showLoader calls are removed) ---

        async function loadTables(isPolling = false) {
            // ... (keep existing logic, just remove showLoader calls) ...
            if (!isPolling) {
                tableList.innerHTML = '<li>Loading tables...</li>';
                schemaTable.innerHTML = '';
                dataTable.innerHTML = '';
                tableDataHeader.textContent = '';
                queryResultContainer.style.display = 'none';
                schemaPlaceholder.style.display = 'block';
                dataPlaceholder.style.display = 'block';
            }
            try {
                const newTables = await fetchAPI('/tables');
                if (!isPolling || JSON.stringify(newTables) !== JSON.stringify(currentTables)) {
                    console.log("Table list changed, updating UI.");
                    currentTables = newTables;
                    displayTables(currentTables);
                    if (!isPolling) {
                         showStatus("Tables loaded.", false);
                    }
                    if (selectedTable && !currentTables.includes(selectedTable)) {
                         console.log(`Selected table "${selectedTable}" removed.`);
                         selectedTable = null;
                         tableDataHeader.textContent = '';
                         schemaDisplay.innerHTML = '<h4>Schema</h4><p id="schemaPlaceholder">Select a table from the list.</p><table id="schemaTable"></table>';
                         dataDisplayContainer.innerHTML = '<h4>Data <span id="tableDataHeader"></span></h4><p id="dataPlaceholder">Select a table from the list.</p><div id="dataDisplay"><table id="dataTable"></table></div>';
                         schemaTable = document.getElementById('schemaTable');
                         dataTable = document.getElementById('dataTable');
                         schemaPlaceholder = document.getElementById('schemaPlaceholder');
                         dataPlaceholder = document.getElementById('dataPlaceholder');
                         tableDataHeader = document.getElementById('tableDataHeader');
                     }
                 }
                 if (currentTables.length > 0 && !isPolling) {
                     schemaPlaceholder.style.display = 'none';
                     dataPlaceholder.style.display = 'none';
                 } else if (currentTables.length === 0 && !isPolling) {
                      tableList.innerHTML = '<li>No tables found.</li>';
                     schemaPlaceholder.textContent = 'No tables found in the database.';
                     dataPlaceholder.textContent = 'No tables found in the database.';
                 }
            } catch (error) {
                if (!isPolling) {
                    tableList.innerHTML = '<li>Error loading tables.</li>';
                    schemaPlaceholder.textContent = 'Error loading tables.';
                    dataPlaceholder.textContent = 'Error loading tables.';
                } else {
                    console.error("Polling error:", error);
                }
            }
        }

        function displayTables(tables) {
            // ... (keep existing logic) ...
             tableList.innerHTML = '';
            if (tables.length === 0) {
                tableList.innerHTML = '<li>No tables found.</li>';
                return;
            }
            tables.sort().forEach(tableName => {
                const li = document.createElement('li');
                li.textContent = tableName;
                li.dataset.tableName = tableName;
                li.onclick = () => handleTableSelection(li);
                if (tableName === selectedTable) {
                    li.classList.add('active');
                }
                tableList.appendChild(li);
            });
        }

        async function handleTableSelection(listItem) {
             // ... (keep existing logic, just remove showLoader calls) ...
            const currentActive = tableList.querySelector('.active');
            if (currentActive) {
                currentActive.classList.remove('active');
            }
            listItem.classList.add('active');

            selectedTable = listItem.dataset.tableName;
            if (!selectedTable) return;

            queryResultContainer.style.display = 'none';
            dataDisplayContainer.style.display = 'flex';
            dataPlaceholder.style.display = 'none';

            tableDataHeader.textContent = `for table "${selectedTable}"`;
            schemaPlaceholder.style.display = 'none';
            schemaTable.innerHTML = '<tbody><tr><td colspan="2">Loading schema...</td></tr></tbody>';
            dataTable.innerHTML = '<tbody><tr><td>Loading data...</td></tr></tbody>';

            try {
                const [schemaResponse, tableDataResponse] = await Promise.all([
                    fetchAPI(`/tables/${selectedTable}/schema`),
                    fetchAPI(`/tables/${selectedTable}?limit=100`)
                ]);
                renderSchema(schemaResponse);
                renderTable(tableDataResponse, dataTable);
            } catch (error) {
                 schemaTable.innerHTML = '<tbody><tr><td colspan="2">Error loading schema.</td></tr></tbody>';
                 dataTable.innerHTML = '<tbody><tr><td>Error loading data.</td></tr></tbody>';
            }
        }


         async function runCustomQuery() {
              // ... (keep existing logic, just remove showLoader calls) ...
             const sql = sqlInput.value.trim();
             if (!sql) {
                 showStatus("SQL query cannot be empty.", true);
                 return;
             }
             const currentActive = tableList.querySelector('.active');
             if (currentActive) {
                 currentActive.classList.remove('active');
             }
             selectedTable = null;

            dataDisplayContainer.style.display = 'none';
            dataPlaceholder.style.display = 'none';
             schemaPlaceholder.style.display = 'block';
             schemaTable.innerHTML = '';
             tableDataHeader.textContent = '';

            queryResultContainer.style.display = 'block';
            queryResultTable.innerHTML = '<tbody><tr><td>Running query...</td></tr></tbody>';

             try {
                 const resultData = await fetchAPI('/query', {
                     method: 'POST',
                     headers: { 'Content-Type': 'application/json', },
                     body: JSON.stringify({ sql: sql }),
                 });
                 renderTable(resultData, queryResultTable);
                 showStatus("Query executed successfully.", false);
             } catch (error) {
                 queryResultTable.innerHTML = '<tbody><tr><td>Error executing query. See status message.</td></tr></tbody>';
             }
         }

         // --- Keep Polling Functions ---
         function startPolling() {
             stopPolling();
             console.log(`Starting polling every ${POLLING_INTERVAL_MS / 1000} seconds.`);
             pollingIntervalId = setInterval(() => loadTables(true), POLLING_INTERVAL_MS);
         }
         function stopPolling() {
             if (pollingIntervalId) {
                 console.log("Stopping polling.");
                 clearInterval(pollingIntervalId);
                 pollingIntervalId = null;
             }
         }

        // --- Initial Setup ---
        runSqlButton.onclick = runCustomQuery;
        document.addEventListener('DOMContentLoaded', () => {
            loadTables().then(() => {
                if (currentTables.length >= 0) { // Start even if no tables initially
                    startPolling();
                }
            });
        });

    </script>

</body>
</html>