import { Container, Graphics, Text } from 'pixi.js';

/**
 * TimeSeriesPlot - Pure visualization component for time-series data
 *
 * This class is responsible ONLY for displaying data, not generating it.
 * It receives data points from external sources and renders them as a
 * scrolling waterfall display.
 *
 * Architecture:
 * - TimeSeriesPlot: Displays data (this file)
 * - DataSource: Generates/provides data (data-sources.js)
 * - Connection: Links sources to plots
 */
export class TimeSeriesPlot {
    constructor(config) {
        this.x = config.x || 0;
        this.y = config.y || 0;
        this.width = config.width || 800;
        this.height = config.height || 600;
        this.title = config.title || 'Time Series';
        this.baseColor = config.color || 0xff6666;

        // Container for all graphics
        this.container = new Container();
        this.container.x = this.x;
        this.container.y = this.y;

        // Graphics layers (order matters for rendering)
        this.gridGraphics = new Graphics();
        this.linesGraphics = new Graphics();
        this.borderGraphics = new Graphics();

        this.container.addChild(this.gridGraphics);
        this.container.addChild(this.linesGraphics);
        this.container.addChild(this.borderGraphics);

        // Title
        this.titleText = new Text({
            text: this.title,
            style: {
                fontFamily: 'Arial',
                fontSize: 18,
                fill: 0xeeeeee,
            }
        });
        this.titleText.x = 10;
        this.titleText.y = 10;
        this.container.addChild(this.titleText);

        // Display state
        this.lines = []; // Array of {points, yOffset, color, metadata}
        this.maxLines = config.maxLines || 100;
        this.showGrid = config.showGrid !== false;

        // Scrolling and scaling
        this.scrollSpeed = config.scrollSpeed || 1.0;
        this.verticalScale = config.verticalScale || 1.0;

        // Initial draw
        this.draw();
    }

    // ========================================================================
    // Data Input API - This is how external sources send data to the plot
    // ========================================================================

    /**
     * Add a new line of data to the plot
     * @param {Array<{x: number, y: number}>} points - Array of points
     * @param {Object} metadata - Optional metadata (color, timestamp, etc.)
     */
    addLine(points, metadata = {}) {
        const line = {
            points: points,
            yOffset: 0,
            color: metadata.color || this.generateColor(Date.now() / 1000),
            timestamp: metadata.timestamp || Date.now(),
            metadata: metadata,
        };

        this.lines.push(line);

        // Limit number of lines
        if (this.lines.length > this.maxLines) {
            this.lines.shift();
        }
    }

    /**
     * Add a single data point (will be buffered into a line)
     * This is useful for streaming real-time data
     * @param {number} timestamp - Time of the data point
     * @param {number} value - Value at this time
     */
    addDataPoint(timestamp, value) {
        // For now, this creates a single-point line
        // In a more sophisticated version, this could buffer points
        // until a full line is ready
        const point = { x: this.width / 2, y: value };
        this.addLine([point], { timestamp });
    }

    /**
     * Clear all data from the plot
     */
    clearData() {
        this.lines = [];
        this.drawLines();
    }

    // ========================================================================
    // Update and Rendering
    // ========================================================================

    /**
     * Update the plot - called each frame
     * This handles scrolling and cleanup, but NOT data generation
     */
    update() {
        // Scroll existing lines down
        this.scrollLines();

        // Remove off-screen lines
        this.lines = this.lines.filter(line => {
            const scaledOffset = line.yOffset * this.verticalScale;
            return scaledOffset < this.height + 50;
        });

        // Redraw
        this.drawLines();
    }

    scrollLines() {
        this.lines.forEach(line => {
            line.yOffset += this.scrollSpeed;
        });
    }

    draw() {
        this.drawBorder();
        this.drawGrid();
        this.drawLines();
    }

    drawBorder() {
        this.borderGraphics.clear();
        this.borderGraphics.rect(0, 0, this.width, this.height);
        this.borderGraphics.stroke({ width: 2, color: 0x606070 });
    }

    drawGrid() {
        this.gridGraphics.clear();

        if (!this.showGrid) return;

        this.gridGraphics.alpha = 0.3;

        const divisions = 10;
        const color = 0x4a7a9a;

        // Vertical lines
        for (let i = 0; i <= divisions; i++) {
            const x = (i / divisions) * this.width;
            this.gridGraphics.moveTo(x, 0);
            this.gridGraphics.lineTo(x, this.height);
            this.gridGraphics.stroke({ width: 1, color });
        }

        // Horizontal lines
        for (let i = 0; i <= divisions; i++) {
            const y = (i / divisions) * this.height;
            this.gridGraphics.moveTo(0, y);
            this.gridGraphics.lineTo(this.width, y);
            this.gridGraphics.stroke({ width: 1, color });
        }
    }

    drawLines() {
        this.linesGraphics.clear();

        for (const line of this.lines) {
            if (line.points.length < 2) continue;

            // Apply vertical scale to y positions
            const scaledYOffset = line.yOffset * this.verticalScale;

            // Start path
            const firstPoint = line.points[0];
            this.linesGraphics.moveTo(firstPoint.x, firstPoint.y + scaledYOffset);

            // Draw line strip
            for (let i = 1; i < line.points.length; i++) {
                const point = line.points[i];
                this.linesGraphics.lineTo(point.x, point.y + scaledYOffset);
            }

            this.linesGraphics.stroke({ width: 2, color: line.color });
        }
    }

    generateColor(time) {
        // Cycle through colors based on time
        const hue = (time * 0.1) % 1.0;
        const r = Math.floor(Math.abs(Math.sin(hue * Math.PI * 2)) * 255);
        const g = Math.floor(Math.abs(Math.sin((hue + 0.33) * Math.PI * 2)) * 255);
        const b = Math.floor(Math.abs(Math.sin((hue + 0.66) * Math.PI * 2)) * 255);

        return (r << 16) | (g << 8) | b;
    }

    // ========================================================================
    // Configuration and Control
    // ========================================================================

    setGridVisible(visible) {
        this.showGrid = visible;
        this.drawGrid();
    }

    setScrollSpeed(speed) {
        this.scrollSpeed = Math.max(0.1, Math.min(10.0, speed));
    }

    setVerticalScale(scale) {
        this.verticalScale = Math.max(0.2, Math.min(3.0, scale));
    }

    setTitle(title) {
        this.title = title;
        this.titleText.text = title;
    }

    resize(x, y, width, height) {
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;

        this.container.x = x;
        this.container.y = y;

        this.draw();
    }

    // ========================================================================
    // Statistics and Debugging
    // ========================================================================

    getVertexCount() {
        return this.lines.reduce((sum, line) => sum + line.points.length, 0);
    }

    getLineCount() {
        return this.lines.length;
    }

    getOldestTimestamp() {
        if (this.lines.length === 0) return null;
        return Math.min(...this.lines.map(l => l.timestamp));
    }

    getNewestTimestamp() {
        if (this.lines.length === 0) return null;
        return Math.max(...this.lines.map(l => l.timestamp));
    }

    getStats() {
        return {
            lineCount: this.getLineCount(),
            vertexCount: this.getVertexCount(),
            oldestTimestamp: this.getOldestTimestamp(),
            newestTimestamp: this.getNewestTimestamp(),
            timeSpan: this.getNewestTimestamp() - this.getOldestTimestamp(),
        };
    }
}