//! Patch Engine
//! Responsible for generating patches from compiled artifacts

use serde::{Deserialize, Serialize};

/// Compiled artifact from the build process
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CompiledArtifact {
    /// The root node ID of the view
    pub root_id: u64,
    /// The serialized view
    pub view: SerializedView,
}

/// Serialized view representation
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SerializedView {
    /// The view type (e.g., "Text", "Button")
    pub view_type: String,
    /// The view properties
    pub props: serde_json::Value,
    /// The child views
    pub children: Vec<SerializedView>,
}

/// Runtime patch types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum RuntimePatch {
    /// Replace a view at the specified node ID
    ReplaceView {
        /// The node ID to replace
        node_id: u64,
        /// The new view to insert
        new_view: SerializedView,
    },
    /// Update state at the specified node ID
    UpdateState {
        /// The node ID to update
        node_id: u64,
        /// The field to update
        field: String,
        /// The new value
        value: serde_json::Value,
    },
    /// Batch multiple patches together
    Batch(Vec<RuntimePatch>),
}

/// Patch Engine implementation
pub struct PatchEngine;

impl PatchEngine {
    /// Create a new PatchEngine
    pub fn new() -> Self {
        Self
    }
    
    /// Generate a patch from a compiled artifact
    pub fn generate_patch(&self, artifact: CompiledArtifact) -> RuntimePatch {
        // TODO: Implement real diff logic
        // For now, we'll create a simple replace view patch
        RuntimePatch::Batch(vec![
            RuntimePatch::ReplaceView {
                node_id: artifact.root_id,
                new_view: artifact.view,
            }
        ])
    }
}