document.addEventListener('DOMContentLoaded', () => {
    // Function Graph Visualization with enhanced controls
    const functionCtx = document.getElementById('functionGraph').getContext('2d');
    let xMin = -10, xMax = 10, yMin = -5, yMax = 5;
const algebraCtx = document.getElementById('algebraGraph').getContext('2d');
    
    // Initialize function graph
    const functionGraph = new Chart(functionCtx, {
        type: 'line',
        data: {
            datasets: [{
                label: 'Function',
                borderColor: '#7c3aed',
                backgroundColor: 'rgba(124, 58, 237, 0.1)',
                borderWidth: 2,
                pointRadius: 0,
                fill: true
            }]
        },
        options: {
            responsive: true,
            maintainAspectRatio: false,
            scales: {
                x: {
                    type: 'linear',
                    position: 'center',
                    min: xMin,
                    max: xMax,
                    title: {
                        display: true,
                        text: 'x-axis',
                        font: {
                            weight: 'bold'
                        }
                    },
                    grid: {
                        color: (ctx) => ctx.tick.value === 0 ? '#000' : 'rgba(0, 0, 0, 0.1)'
                    }
                },
                y: {
                    type: 'linear',
                    position: 'center',
                    min: yMin,
                    max: yMax,
                    title: {
                        display: true,
                        text: 'y-axis',
                        font: {
                            weight: 'bold'
                        }
                    },
                    grid: {
                        color: (ctx) => ctx.tick.value === 0 ? '#000' : 'rgba(0, 0, 0, 0.1)'
                    }
                }
            },
            plugins: {
                tooltip: {
                    mode: 'nearest',
                    intersect: false,
                    callbacks: {
                        label: (context) => {
                            return `f(${context.parsed.x.toFixed(2)}) = ${context.parsed.y.toFixed(2)}`;
                        }
                    }
                },
                legend: {
                    display: false
                },
                zoom: {
                    pan: {
                        enabled: true,
                        mode: 'xy'
                    },
                    zoom: {
                        wheel: {
                            enabled: true
                        },
                        pinch: {
                            enabled: true
                        },
                        mode: 'xy'
                    }
                }
            },
            interaction: {
                mode: 'nearest',
                intersect: false
            }
        }
});

    // Initialize algebra graph
    const algebraGraph = new Chart(algebraCtx, {
        type: 'line',
        data: {
            datasets: [{
                label: 'Linear Equation',
                borderColor: '#0ea5e9',
                backgroundColor: 'rgba(14, 165, 233, 0.1)',
                borderWidth: 2,
                pointRadius: 0
            }]
        },
        options: {
            responsive: true,
            scales: {
                x: {
                    type: 'linear',
                    position: 'center',
                    min: -10,
                    max: 10
                },
                y: {
                    type: 'linear',
                    position: 'center',
                    min: -10,
                    max: 10
                }
            }
        }
    });
    // Add zoom and pan controls
    document.getElementById('zoomIn').addEventListener('click', () => {
        xMin *= 0.8;
        xMax *= 0.8;
        yMin *= 0.8;
        yMax *= 0.8;
        updateGraphScale();
    });

    document.getElementById('zoomOut').addEventListener('click', () => {
        xMin *= 1.2;
        xMax *= 1.2;
        yMin *= 1.2;
        yMax *= 1.2;
        updateGraphScale();
    });

    document.getElementById('resetView').addEventListener('click', () => {
        xMin = -10; xMax = 10;
        yMin = -5; yMax = 5;
        updateGraphScale();
    });

    function updateGraphScale() {
        functionGraph.options.scales.x.min = xMin;
        functionGraph.options.scales.x.max = xMax;
        functionGraph.options.scales.y.min = yMin;
        functionGraph.options.scales.y.max = yMax;
        functionGraph.update();
    }

    // Update function graph when input changes
    document.getElementById('functionInput').addEventListener('input', function() {
        updateFunctionGraph();
    });

    // Mouse move coordinates display
    const coordDisplay = document.getElementById('coordinatesDisplay');
    document.getElementById('functionGraph').addEventListener('mousemove', (e) => {
        const rect = e.target.getBoundingClientRect();
        const x = xMin + (xMax - xMin) * (e.clientX - rect.left) / rect.width;
        const y = yMax - (yMax - yMin) * (e.clientY - rect.top) / rect.height;
        coordDisplay.textContent = `x: ${x.toFixed(2)}, y: ${y.toFixed(2)}`;
    });
    function updateFunctionGraph() {
        const func = document.getElementById('functionInput').value;
        const data = [];
        let isValid = true;
        
        for (let x = xMin; x <= xMax; x += (xMax - xMin)/200) {
            try {
                const y = math.evaluate(func, {x: x});
                if (!isNaN(y) && isFinite(y)) {
                    data.push({x: x, y: y});
                } else {
                    isValid = false;
                }
            } catch (e) {
                console.error("Error evaluating function:", e);
                isValid = false;
            }
        }
        
        // Update line color based on validity
        functionGraph.data.datasets[0].borderColor = isValid ? '#7c3aed' : '#ef4444';
functionGraph.data.datasets[0].data = data;
        functionGraph.update();
    }

    // Update algebra graph with sliders
    document.getElementById('sliderM').addEventListener('input', updateAlgebraGraph);
    document.getElementById('sliderB').addEventListener('input', updateAlgebraGraph);

    function updateAlgebraGraph() {
        const m = parseFloat(document.getElementById('sliderM').value);
        const b = parseFloat(document.getElementById('sliderB').value);
        
        const data = [
            {x: -10, y: m*-10 + b},
            {x: 10, y: m*10 + b}
        ];
        
        algebraGraph.data.datasets[0].data = data;
        algebraGraph.update();
    }

    // Initialize graphs
    updateFunctionGraph();
    updateAlgebraGraph();

    // Geometry Canvas Interaction
    const geometryCanvas = document.getElementById('geometryCanvas');
    let isDrawing = false;
    let currentShape = null;
    let startX, startY;

    document.getElementById('drawLine').addEventListener('click', () => setShapeMode('line'));
    document.getElementById('drawCircle').addEventListener('click', () => setShapeMode('circle'));
    document.getElementById('drawRectangle').addEventListener('click', () => setShapeMode('rectangle'));
    document.getElementById('drawTriangle').addEventListener('click', () => setShapeMode('triangle'));

    function setShapeMode(shape) {
        currentShape = shape;
        clearGeometryCanvas();
    }

    function clearGeometryCanvas() {
        geometryCanvas.innerHTML = '<div class="absolute inset-0 flex items-center justify-center text-gray-400">Draw shapes here</div>';
    }

    geometryCanvas.addEventListener('mousedown', (e) => {
        if (!currentShape) return;
        
        isDrawing = true;
        const rect = geometryCanvas.getBoundingClientRect();
        startX = e.clientX - rect.left;
        startY = e.clientY - rect.top;
        
        // Clear instructions if present
        if (geometryCanvas.querySelector('div')) {
            geometryCanvas.innerHTML = '';
        }
    });

    geometryCanvas.addEventListener('mousemove', (e) => {
        if (!isDrawing || !currentShape) return;
        
        const rect = geometryCanvas.getBoundingClientRect();
        const endX = e.clientX - rect.left;
        const endY = e.clientY - rect.top;
        
        // Clear previous shape
        geometryCanvas.innerHTML = '';
        
        // Draw new shape
        const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
        svg.setAttribute('width', '100%');
        svg.setAttribute('height', '100%');
        svg.style.position = 'absolute';
        
        let shape;
        switch (currentShape) {
            case 'line':
                shape = document.createElementNS("http://www.w3.org/2000/svg", "line");
                shape.setAttribute('x1', startX);
                shape.setAttribute('y1', startY);
                shape.setAttribute('x2', endX);
                shape.setAttribute('y2', endY);
                shape.setAttribute('stroke', '#7c3aed');
                shape.setAttribute('stroke-width', '2');
                break;
                
            case 'circle':
                const radius = Math.sqrt(Math.pow(endX - startX, 2) + Math.pow(endY - startY, 2));
                shape = document.createElementNS("http://www.w3.org/2000/svg", "circle");
                shape.setAttribute('cx', startX);
                shape.setAttribute('cy', startY);
                shape.setAttribute('r', radius);
                shape.setAttribute('fill', 'rgba(124, 58, 237, 0.2)');
                shape.setAttribute('stroke', '#7c3aed');
                shape.setAttribute('stroke-width', '2');
                break;
                
            case 'rectangle':
                shape = document.createElementNS("http://www.w3.org/2000/svg", "rect");
                shape.setAttribute('x', Math.min(startX, endX));
                shape.setAttribute('y', Math.min(startY, endY));
                shape.setAttribute('width', Math.abs(endX - startX));
                shape.setAttribute('height', Math.abs(endY - startY));
                shape.setAttribute('fill', 'rgba(124, 58, 237, 0.2)');
                shape.setAttribute('stroke', '#7c3aed');
                shape.setAttribute('stroke-width', '2');
                break;
                
            case 'triangle':
                shape = document.createElementNS("http://www.w3.org/2000/svg", "polygon");
                const points = `${startX},${startY} ${endX},${endY} ${startX},${endY}`;
                shape.setAttribute('points', points);
                shape.setAttribute('fill', 'rgba(124, 58, 237, 0.2)');
                shape.setAttribute('stroke', '#7c3aed');
                shape.setAttribute('stroke-width', '2');
                break;
        }
        
        svg.appendChild(shape);
        geometryCanvas.appendChild(svg);
    });

    geometryCanvas.addEventListener('mouseup', () => {
        isDrawing = false;
    });

    geometryCanvas.addEventListener('mouseleave', () => {
        isDrawing = false;
    });
});