document.addEventListener('DOMContentLoaded', () => {
    const configSelect = document.getElementById('config-select');
    const tbody = document.getElementById('metrics-tbody');
    const tfoot = document.getElementById('metrics-tfoot');
    const instancesList = document.getElementById('instances-list');
    const instancesTitle = document.getElementById('instances-title');

    let currentConfig = null;
    let selectedCell = null;

    // Initialize
    fetchConfigs();

    configSelect.addEventListener('change', (e) => {
        currentConfig = e.target.value;
        loadMetrics(currentConfig);
        clearInstances();
    });

    async function fetchConfigs() {
        try {
            const res = await fetch('/api/configs');
            const data = await res.json();
            
            configSelect.innerHTML = '';
            
            if (data.configs.length === 0) {
                const opt = document.createElement('option');
                opt.text = 'Aucune configuration trouvée';
                opt.disabled = true;
                configSelect.appendChild(opt);
                return;
            }

            data.configs.forEach((conf, idx) => {
                const opt = document.createElement('option');
                opt.value = conf;
                opt.text = conf;
                if (idx === 0) {
                    opt.selected = true;
                    currentConfig = conf;
                }
                configSelect.appendChild(opt);
            });

            if (currentConfig) {
                loadMetrics(currentConfig);
            }
            
        } catch (err) {
            console.error('Failed to fetch configs', err);
            configSelect.innerHTML = '<option disabled selected>Erreur de chargement</option>';
        }
    }

    async function loadMetrics(configName) {
        try {
            const res = await fetch(`/api/configs/${encodeURIComponent(configName)}/metrics`);
            const data = await res.json();
            
            renderTable(data.metrics, data.macro_f1);
        } catch (err) {
            console.error('Failed to load metrics', err);
            tbody.innerHTML = '<tr><td colspan="8">Erreur lors du chargement des données.</td></tr>';
        }
    }

    function getMetricColor(value) {
        if (value >= 0.8) return 'var(--metric-good)';
        if (value >= 0.5) return 'var(--metric-ok)';
        return 'var(--metric-bad)';
    }

    function renderTable(metrics, macroF1) {
        tbody.innerHTML = '';
        
        metrics.forEach(m => {
            const tr = document.createElement('tr');
            
            const f1Color = getMetricColor(m.f1);
            const precColor = getMetricColor(m.precision);
            const recColor = getMetricColor(m.recall);

            tr.innerHTML = `
                <td>${escapeHtml(m.display_name)}</td>
                <td style="color: ${f1Color}">${m.f1.toFixed(3)}</td>
                <td style="color: ${precColor}">${m.precision.toFixed(3)}</td>
                <td style="color: ${recColor}">${m.recall.toFixed(3)}</td>
                <td class="cell-clickable" data-label="${escapeHtml(m.label)}" data-outcome="fn">${m.fn}</td>
                <td class="cell-clickable" data-label="${escapeHtml(m.label)}" data-outcome="fp">${m.fp}</td>
                <td class="cell-clickable" data-label="${escapeHtml(m.label)}" data-outcome="tn">${m.tn}</td>
                <td class="cell-clickable" data-label="${escapeHtml(m.label)}" data-outcome="tp">${m.tp}</td>
            `;
            
            tbody.appendChild(tr);
        });

        const macroColor = getMetricColor(macroF1);
        tfoot.innerHTML = `
            <tr>
                <td style="font-style:italic;">Macro avg</td>
                <td style="color: ${macroColor}">${macroF1.toFixed(3)}</td>
                <td></td>
                <td></td>
                <td></td>
                <td></td>
                <td></td>
                <td></td>
            </tr>
        `;

        // Attach event listeners to clickable cells
        const clickableCells = tbody.querySelectorAll('.cell-clickable');
        clickableCells.forEach(cell => {
            cell.addEventListener('click', onCellClick);
        });
    }

    async function onCellClick(e) {
        if (!currentConfig) return;

        const cell = e.currentTarget;
        const label = cell.getAttribute('data-label');
        const outcome = cell.getAttribute('data-outcome');

        // Manage selection state
        if (selectedCell) {
            selectedCell.classList.remove('cell-selected');
        }
        selectedCell = cell;
        selectedCell.classList.add('cell-selected');

        try {
            const res = await fetch(`/api/configs/${encodeURIComponent(currentConfig)}/instances?label=${encodeURIComponent(label)}&outcome=${encodeURIComponent(outcome)}`);
            const data = await res.json();
            
            instancesTitle.textContent = data.title;
            
            instancesList.innerHTML = '';
            if (data.texts && data.texts.length > 0) {
                data.texts.forEach(text => {
                    const div = document.createElement('div');
                    div.className = 'instance-item';
                    div.textContent = text;
                    instancesList.appendChild(div);
                });
            } else {
                instancesList.innerHTML = '<div class="instances-empty">Aucune phrase à afficher.</div>';
            }
            
        } catch (err) {
            console.error('Failed to load instances', err);
            instancesTitle.textContent = "Erreur de chargement";
            instancesList.innerHTML = '<div class="instances-empty">Impossible de charger les instances.</div>';
        }
    }

    function clearInstances() {
        instancesTitle.textContent = "Cliquez sur une cellule pour voir les instances";
        instancesList.innerHTML = '<div class="instances-empty">Aucune phrase à afficher.</div>';
        if (selectedCell) {
            selectedCell.classList.remove('cell-selected');
            selectedCell = null;
        }
    }

    function escapeHtml(unsafe) {
        return (unsafe || '').toString()
             .replace(/&/g, "&amp;")
             .replace(/</g, "&lt;")
             .replace(/>/g, "&gt;")
             .replace(/"/g, "&quot;")
             .replace(/'/g, "&#039;");
    }
});