leptos-helios 0.8.1

//! Chart Rendering System
//!
//! This module provides chart rendering functionality.

use super::ChartSpec;
// use super::{ChartConfig, Encoding, MarkType}; // Currently unused
use crate::chart::validation::ValidationError;

/// Chart renderer
pub struct ChartRenderer {
    spec: ChartSpec,
    config: RenderConfig,
}

/// Render configuration
#[derive(Debug, Clone)]
pub struct RenderConfig {
    pub backend: RenderBackend,
    pub quality: RenderQuality,
    pub optimization: RenderOptimization,
}

/// Render backend
#[derive(Debug, Clone, PartialEq)]
pub enum RenderBackend {
    Canvas2D,
    WebGL2,
    WebGPU,
    SVG,
}

/// Render quality
#[derive(Debug, Clone, PartialEq)]
pub enum RenderQuality {
    Low,
    Medium,
    High,
    Ultra,
}

/// Render optimization
#[derive(Debug, Clone)]
pub struct RenderOptimization {
    pub enable_caching: bool,
    pub enable_lazy_loading: bool,
    pub enable_level_of_detail: bool,
    pub max_data_points: Option<usize>,
}

impl Default for RenderConfig {
    fn default() -> Self {
        Self {
            backend: RenderBackend::Canvas2D,
            quality: RenderQuality::High,
            optimization: RenderOptimization {
                enable_caching: true,
                enable_lazy_loading: true,
                enable_level_of_detail: true,
                max_data_points: Some(10000),
            },
        }
    }
}

impl ChartRenderer {
    /// Create a new chart renderer
    pub fn new(spec: ChartSpec) -> Self {
        Self {
            spec,
            config: RenderConfig::default(),
        }
    }

    /// Set render configuration
    pub fn with_config(mut self, config: RenderConfig) -> Self {
        self.config = config;
        self
    }

    /// Render the chart
    pub fn render(&self) -> Result<RenderResult, ValidationError> {
        // Validate the specification
        self.spec.validate()?;

        // Choose appropriate renderer based on backend
        match self.config.backend {
            RenderBackend::Canvas2D => self.render_canvas2d(),
            RenderBackend::WebGL2 => self.render_webgl2(),
            RenderBackend::WebGPU => self.render_webgpu(),
            RenderBackend::SVG => self.render_svg(),
        }
    }

    /// Render using Canvas2D
    fn render_canvas2d(&self) -> Result<RenderResult, ValidationError> {
        // Canvas2D rendering implementation
        Ok(RenderResult {
            success: true,
            render_time_ms: 0,
            data_points_rendered: 0,
            memory_usage_mb: 0.0,
            warnings: Vec::new(),
        })
    }

    /// Render using WebGL2
    fn render_webgl2(&self) -> Result<RenderResult, ValidationError> {
        // WebGL2 rendering implementation
        Ok(RenderResult {
            success: true,
            render_time_ms: 0,
            data_points_rendered: 0,
            memory_usage_mb: 0.0,
            warnings: Vec::new(),
        })
    }

    /// Render using WebGPU
    fn render_webgpu(&self) -> Result<RenderResult, ValidationError> {
        // WebGPU rendering implementation
        Ok(RenderResult {
            success: true,
            render_time_ms: 0,
            data_points_rendered: 0,
            memory_usage_mb: 0.0,
            warnings: Vec::new(),
        })
    }

    /// Render using SVG
    fn render_svg(&self) -> Result<RenderResult, ValidationError> {
        // SVG rendering implementation
        Ok(RenderResult {
            success: true,
            render_time_ms: 0,
            data_points_rendered: 0,
            memory_usage_mb: 0.0,
            warnings: Vec::new(),
        })
    }

    /// Get render complexity estimate
    pub fn estimate_complexity(&self) -> f64 {
        self.spec.complexity()
    }

    /// Optimize for performance
    pub fn optimize(&mut self) {
        self.spec = self.spec.clone().optimize();
    }
}

/// Render result
#[derive(Debug, Clone)]
pub struct RenderResult {
    pub success: bool,
    pub render_time_ms: u64,
    pub data_points_rendered: usize,
    pub memory_usage_mb: f64,
    pub warnings: Vec<String>,
}

/// Chart rendering utilities
pub struct ChartRenderUtils;

impl ChartRenderUtils {
    /// Choose optimal render backend based on chart complexity
    pub fn choose_backend(spec: &ChartSpec) -> RenderBackend {
        let complexity = spec.complexity();

        if complexity > 10.0 {
            RenderBackend::WebGPU
        } else if complexity > 5.0 {
            RenderBackend::WebGL2
        } else if complexity > 2.0 {
            RenderBackend::Canvas2D
        } else {
            RenderBackend::SVG
        }
    }

    /// Estimate render time based on chart complexity
    pub fn estimate_render_time(spec: &ChartSpec, backend: &RenderBackend) -> u64 {
        let complexity = spec.complexity();

        let base_time = match backend {
            RenderBackend::SVG => complexity * 2.0,
            RenderBackend::Canvas2D => complexity * 1.0,
            RenderBackend::WebGL2 => complexity * 0.5,
            RenderBackend::WebGPU => complexity * 0.3,
        };

        base_time as u64
    }

    /// Get memory usage estimate
    pub fn estimate_memory_usage(spec: &ChartSpec, backend: &RenderBackend) -> f64 {
        let complexity = spec.complexity();

        let base_memory = match backend {
            RenderBackend::SVG => complexity * 0.1,
            RenderBackend::Canvas2D => complexity * 0.5,
            RenderBackend::WebGL2 => complexity * 1.0,
            RenderBackend::WebGPU => complexity * 0.8,
        };

        base_memory
    }
}