//! Serializable material asset files under `assets/materials/`.

use serde::{Deserialize, Serialize};

use crate::{MaterialDesc, MaterialParameter, MaterialShaderKind, MaterialTextureBinding};

/// RON material asset: label plus authoring [`MaterialDesc`].
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MaterialAsset {
    pub label: String,
    #[serde(default)]
    pub shader: Option<String>,
    pub material: MaterialDesc,
}

impl MaterialAsset {
    pub fn load_from_path(catalog_path: &str) -> Result<Self, String> {
        let text = std::fs::read_to_string(catalog_path)
            .map_err(|err| format!("could not read {catalog_path}: {err}"))?;
        ron::from_str(&text).map_err(|err| format!("invalid material RON in {catalog_path}: {err}"))
    }
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum ShaderPropertyType {
    Bool,
    Float { min: Option<f32>, max: Option<f32> },
    Vec2,
    Vec3,
    Color,
    Enum { options: Vec<String> },
    Texture,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct ShaderPropertyDesc {
    pub name: String,
    pub display_name: String,
    #[serde(default)]
    pub group: String,
    pub property_type: ShaderPropertyType,
}

/// RON shader schema describing material inspector parameters.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct ShaderSchemaAsset {
    pub label: String,
    pub kind: MaterialShaderKind,
    #[serde(default)]
    pub wgsl_path: Option<String>,
    #[serde(default)]
    pub parameters: Vec<ShaderPropertyDesc>,
    #[serde(default)]
    pub default_values: Vec<MaterialParameter>,
    #[serde(default)]
    pub default_textures: Vec<MaterialTextureBinding>,
}

impl ShaderSchemaAsset {
    pub fn load_from_path(catalog_path: &str) -> Result<Self, String> {
        let text = std::fs::read_to_string(catalog_path)
            .map_err(|err| format!("could not read {catalog_path}: {err}"))?;
        ron::from_str(&text)
            .map_err(|err| format!("invalid shader schema RON in {catalog_path}: {err}"))
    }
}