// Atomizer Dashboard - Frontend JavaScript

const API_BASE = 'http://localhost:8080/api';
let currentStudy = null;
let charts = {
    progress: null,
    designVars: null,
    constraints: null
};

// Initialize dashboard
document.addEventListener('DOMContentLoaded', () => {
    console.log('Atomizer Dashboard loaded');
    refreshStudies();
    startActiveOptimizationsPolling();
});

// ====================
// Studies Management
// ====================

async function refreshStudies() {
    try {
        const response = await fetch(`${API_BASE}/studies`);
        const data = await response.json();

        if (data.success) {
            renderStudiesList(data.studies);
        } else {
            showError('Failed to load studies: ' + data.error);
        }
    } catch (error) {
        showError('Connection error: ' + error.message);
    }
}

function renderStudiesList(studies) {
    const container = document.getElementById('studiesList');

    if (!studies || studies.length === 0) {
        container.innerHTML = '<p class="empty">No studies found</p>';
        return;
    }

    const html = studies.map(study => `
        <div class="study-item" onclick="loadStudy('${study.study_name}')">
            <div class="study-name">${study.study_name}</div>
            <div class="study-info">
                <span class="badge">${study.total_trials || 0} trials</span>
                ${study.resume_count > 0 ? `<span class="badge-secondary">Resumed ${study.resume_count}x</span>` : ''}
            </div>
            <div class="study-date">${formatDate(study.created_at)}</div>
        </div>
    `).join('');

    container.innerHTML = html;
}

async function loadStudy(studyName) {
    try {
        const response = await fetch(`${API_BASE}/studies/${studyName}`);
        const data = await response.json();

        if (data.success) {
            currentStudy = studyName;
            displayStudyDetails(data);
        } else {
            showError('Failed to load study: ' + data.error);
        }
    } catch (error) {
        showError('Connection error: ' + error.message);
    }
}

function displayStudyDetails(data) {
    // Hide welcome, show details
    document.getElementById('welcomeScreen').style.display = 'none';
    document.getElementById('studyDetails').style.display = 'block';

    // Update header
    document.getElementById('studyTitle').textContent = data.study_name;
    document.getElementById('studyMeta').textContent =
        `Created: ${formatDate(data.metadata.created_at)} | Config Hash: ${data.metadata.config_hash.substring(0, 8)}`;

    // Update summary cards
    if (data.summary && data.summary.best_value !== undefined) {
        document.getElementById('bestObjective').textContent = data.summary.best_value.toFixed(4);
        document.getElementById('totalTrials').textContent = data.summary.n_trials || data.history.length;

        // Best parameters
        const paramsHtml = Object.entries(data.summary.best_params || {})
            .map(([name, value]) => `<div><strong>${name}:</strong> ${value.toFixed(4)}</div>`)
            .join('');
        document.getElementById('bestParams').innerHTML = paramsHtml || '<p>No data</p>';
    }

    // Render charts
    renderCharts(data.history);

    // Render history table
    renderHistoryTable(data.history);
}

// ====================
// Charts
// ====================

async function renderCharts(history) {
    if (!history || history.length === 0) return;

    // Get visualization data
    try {
        const response = await fetch(`${API_BASE}/results/visualization/${currentStudy}`);
        const data = await response.json();

        if (!data.success) return;

        // Progress Chart
        renderProgressChart(data.trials, data.total_objectives, data.running_best);

        // Design Variables Chart
        renderDesignVarsChart(data.trials, data.design_variables);

        // Constraints Chart
        renderConstraintsChart(data.trials, data.constraints);
    } catch (error) {
        console.error('Error rendering charts:', error);
    }
}

function renderProgressChart(trials, objectives, runningBest) {
    const ctx = document.getElementById('progressChart').getContext('2d');

    if (charts.progress) {
        charts.progress.destroy();
    }

    charts.progress = new Chart(ctx, {
        type: 'line',
        data: {
            labels: trials,
            datasets: [
                {
                    label: 'Total Objective',
                    data: objectives,
                    borderColor: '#3b82f6',
                    backgroundColor: 'rgba(59, 130, 246, 0.1)',
                    tension: 0.1
                },
                {
                    label: 'Running Best',
                    data: runningBest,
                    borderColor: '#10b981',
                    backgroundColor: 'rgba(16, 185, 129, 0.1)',
                    borderWidth: 2,
                    tension: 0.1
                }
            ]
        },
        options: {
            responsive: true,
            maintainAspectRatio: false,
            plugins: {
                legend: {
                    display: true,
                    position: 'top'
                },
                tooltip: {
                    mode: 'index',
                    intersect: false
                }
            },
            scales: {
                x: {
                    title: {
                        display: true,
                        text: 'Trial Number'
                    }
                },
                y: {
                    title: {
                        display: true,
                        text: 'Objective Value'
                    }
                }
            }
        }
    });
}

function renderDesignVarsChart(trials, designVars) {
    const ctx = document.getElementById('designVarsChart').getContext('2d');

    if (charts.designVars) {
        charts.designVars.destroy();
    }

    const colors = ['#3b82f6', '#10b981', '#f59e0b', '#ef4444', '#8b5cf6'];
    const datasets = Object.entries(designVars).map(([name, values], index) => ({
        label: name,
        data: values,
        borderColor: colors[index % colors.length],
        backgroundColor: colors[index % colors.length] + '20',
        tension: 0.1
    }));

    charts.designVars = new Chart(ctx, {
        type: 'line',
        data: {
            labels: trials,
            datasets: datasets
        },
        options: {
            responsive: true,
            maintainAspectRatio: false,
            plugins: {
                legend: {
                    display: true,
                    position: 'top'
                }
            },
            scales: {
                x: {
                    title: {
                        display: true,
                        text: 'Trial Number'
                    }
                },
                y: {
                    title: {
                        display: true,
                        text: 'Value'
                    }
                }
            }
        }
    });
}

function renderConstraintsChart(trials, constraints) {
    const ctx = document.getElementById('constraintsChart').getContext('2d');

    if (charts.constraints) {
        charts.constraints.destroy();
    }

    const colors = ['#3b82f6', '#10b981', '#f59e0b'];
    const datasets = Object.entries(constraints).map(([name, values], index) => ({
        label: name,
        data: values,
        borderColor: colors[index % colors.length],
        backgroundColor: colors[index % colors.length] + '20',
        tension: 0.1
    }));

    charts.constraints = new Chart(ctx, {
        type: 'line',
        data: {
            labels: trials,
            datasets: datasets
        },
        options: {
            responsive: true,
            maintainAspectRatio: false,
            plugins: {
                legend: {
                    display: true,
                    position: 'top'
                }
            },
            scales: {
                x: {
                    title: {
                        display: true,
                        text: 'Trial Number'
                    }
                },
                y: {
                    title: {
                        display: true,
                        text: 'Value'
                    }
                }
            }
        }
    });
}

// ====================
// History Table
// ====================

function renderHistoryTable(history) {
    const tbody = document.querySelector('#historyTable tbody');

    if (!history || history.length === 0) {
        tbody.innerHTML = '<tr><td colspan="5">No trials yet</td></tr>';
        return;
    }

    const html = history.map(trial => `
        <tr>
            <td>${trial.trial_number}</td>
            <td>${trial.total_objective.toFixed(4)}</td>
            <td>${formatDesignVars(trial.design_variables)}</td>
            <td>${formatConstraints(trial.constraints)}</td>
            <td>${formatDateTime(trial.timestamp)}</td>
        </tr>
    `).join('');

    tbody.innerHTML = html;
}

function formatDesignVars(vars) {
    return Object.entries(vars)
        .map(([name, value]) => `${name}=${value.toFixed(4)}`)
        .join(', ');
}

function formatConstraints(constraints) {
    return Object.entries(constraints)
        .map(([name, value]) => `${name}=${value.toFixed(4)}`)
        .join(', ');
}

// ====================
// New Optimization
// ====================

function showNewOptimizationModal() {
    document.getElementById('newOptimizationModal').style.display = 'flex';
}

function closeNewOptimizationModal() {
    document.getElementById('newOptimizationModal').style.display = 'none';
}

async function startOptimization() {
    const studyName = document.getElementById('newStudyName').value || `study_${Date.now()}`;
    const nTrials = parseInt(document.getElementById('newTrials').value) || 50;
    const configPath = document.getElementById('newConfigPath').value;
    const resume = document.getElementById('resumeExisting').checked;

    try {
        const response = await fetch(`${API_BASE}/optimization/start`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({
                study_name: studyName,
                n_trials: nTrials,
                config_path: configPath,
                resume: resume
            })
        });

        const data = await response.json();

        if (data.success) {
            showSuccess(`Optimization "${studyName}" started successfully!`);
            closeNewOptimizationModal();
            setTimeout(refreshStudies, 1000);
        } else {
            showError('Failed to start optimization: ' + data.error);
        }
    } catch (error) {
        showError('Connection error: ' + error.message);
    }
}

// ====================
// Active Optimizations Polling
// ====================

function startActiveOptimizationsPolling() {
    setInterval(updateActiveOptimizations, 5000); // Poll every 5 seconds
    updateActiveOptimizations();
}

async function updateActiveOptimizations() {
    try {
        const response = await fetch(`${API_BASE}/optimization/status`);
        const data = await response.json();

        if (data.success) {
            renderActiveOptimizations(data.active_optimizations);
        }
    } catch (error) {
        console.error('Failed to update active optimizations:', error);
    }
}

function renderActiveOptimizations(optimizations) {
    const container = document.getElementById('activeOptimizations');

    const entries = Object.entries(optimizations);
    if (entries.length === 0) {
        container.innerHTML = '<p class="empty">No active optimizations</p>';
        return;
    }

    const html = entries.map(([name, opt]) => `
        <div class="active-item">
            <div class="active-name">${name}</div>
            <div class="active-status status-${opt.status}">${opt.status}</div>
            ${opt.status === 'running' ? `
                <div class="progress-bar">
                    <div class="progress-fill" style="width: ${(opt.current_trial / opt.n_trials * 100).toFixed(0)}%"></div>
                </div>
                <div class="active-progress">${opt.current_trial || 0} / ${opt.n_trials} trials</div>
            ` : ''}
        </div>
    `).join('');

    container.innerHTML = html;
}

// ====================
// Study Actions
// ====================

async function resumeCurrentStudy() {
    if (!currentStudy) return;

    const nTrials = prompt('Number of additional trials:', '25');
    if (!nTrials) return;

    try {
        const response = await fetch(`${API_BASE}/optimization/start`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({
                study_name: currentStudy,
                n_trials: parseInt(nTrials),
                resume: true
            })
        });

        const data = await response.json();

        if (data.success) {
            showSuccess(`Study "${currentStudy}" resumed with ${nTrials} additional trials`);
        } else {
            showError('Failed to resume study: ' + data.error);
        }
    } catch (error) {
        showError('Connection error: ' + error.message);
    }
}

async function deleteCurrentStudy() {
    if (!currentStudy) return;

    if (!confirm(`Are you sure you want to delete study "${currentStudy}"? This cannot be undone.`)) {
        return;
    }

    try {
        const response = await fetch(`${API_BASE}/studies/${currentStudy}/delete`, {
            method: 'DELETE'
        });

        const data = await response.json();

        if (data.success) {
            showSuccess(`Study "${currentStudy}" deleted successfully`);
            currentStudy = null;
            document.getElementById('studyDetails').style.display = 'none';
            document.getElementById('welcomeScreen').style.display = 'block';
            refreshStudies();
        } else {
            showError('Failed to delete study: ' + data.error);
        }
    } catch (error) {
        showError('Connection error: ' + error.message);
    }
}

// ====================
// Utility Functions
// ====================

function formatDate(dateString) {
    if (!dateString) return 'N/A';
    const date = new Date(dateString);
    return date.toLocaleDateString();
}

function formatDateTime(dateString) {
    if (!dateString) return 'N/A';
    const date = new Date(dateString);
    return date.toLocaleString();
}

function showSuccess(message) {
    // Simple success notification
    alert('✓ ' + message);
}

function showError(message) {
    // Simple error notification
    alert('✗ Error: ' + message);
    console.error(message);
}