trustformers-mobile 0.1.1

//! Vulkan GPU Compute Support for Android
//!
//! This module provides Vulkan API integration for GPU-accelerated
//! neural network inference on Android devices.

use std::os::raw::c_void;
use trustformers_core::error::{CoreError, Result};

// Vulkan handle types
#[cfg(target_os = "android")]
#[repr(C)]
#[derive(Debug, Clone, Copy)]
pub struct VkInstance(pub *mut c_void);

#[cfg(target_os = "android")]
#[repr(C)]
#[derive(Debug, Clone, Copy)]
pub struct VkDevice(pub *mut c_void);

#[cfg(target_os = "android")]
#[repr(C)]
#[derive(Debug, Clone, Copy)]
pub struct VkPhysicalDevice(pub *mut c_void);

#[cfg(target_os = "android")]
#[repr(C)]
#[derive(Debug, Clone, Copy)]
pub struct VkQueue(pub *mut c_void);

#[cfg(target_os = "android")]
#[repr(C)]
#[derive(Debug, Clone, Copy)]
pub struct VkCommandBuffer(pub *mut c_void);

#[cfg(target_os = "android")]
#[repr(C)]
#[derive(Debug, Clone, Copy)]
pub struct VkBuffer(pub *mut c_void);

#[cfg(target_os = "android")]
#[repr(C)]
#[derive(Debug, Clone, Copy)]
pub struct VkDeviceMemory(pub *mut c_void);

#[cfg(target_os = "android")]
#[repr(C)]
#[derive(Debug, Clone, Copy)]
pub struct VkDescriptorSet(pub *mut c_void);

#[cfg(target_os = "android")]
#[repr(C)]
#[derive(Debug, Clone, Copy)]
pub struct VkPipeline(pub *mut c_void);

// Vulkan result codes
pub const VK_SUCCESS: i32 = 0;
pub const VK_NOT_READY: i32 = 1;
pub const VK_TIMEOUT: i32 = 2;
pub const VK_EVENT_SET: i32 = 3;
pub const VK_EVENT_RESET: i32 = 4;
pub const VK_INCOMPLETE: i32 = 5;
pub const VK_ERROR_OUT_OF_HOST_MEMORY: i32 = -1;
pub const VK_ERROR_OUT_OF_DEVICE_MEMORY: i32 = -2;
pub const VK_ERROR_INITIALIZATION_FAILED: i32 = -3;
pub const VK_ERROR_DEVICE_LOST: i32 = -4;
pub const VK_ERROR_MEMORY_MAP_FAILED: i32 = -5;

// Vulkan constants
pub const VK_PIPELINE_BIND_POINT_COMPUTE: u32 = 1;
pub const VK_COMMAND_BUFFER_LEVEL_PRIMARY: u32 = 0;
pub const VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT: u32 = 0x00000002;
pub const VK_MEMORY_PROPERTY_HOST_COHERENT_BIT: u32 = 0x00000004;
pub const VK_BUFFER_USAGE_STORAGE_BUFFER_BIT: u32 = 0x00000020;

// Vulkan C API bindings
#[cfg(target_os = "android")]
extern "C" {
    pub fn vkCreateInstance(
        create_info: *const c_void,
        allocator: *const c_void,
        instance: *mut VkInstance,
    ) -> i32;

    pub fn vkDestroyInstance(instance: VkInstance, allocator: *const c_void);

    pub fn vkEnumeratePhysicalDevices(
        instance: VkInstance,
        device_count: *mut u32,
        physical_devices: *mut VkPhysicalDevice,
    ) -> i32;

    pub fn vkGetPhysicalDeviceProperties(physical_device: VkPhysicalDevice, properties: *mut c_void);

    pub fn vkCreateDevice(
        physical_device: VkPhysicalDevice,
        create_info: *const c_void,
        allocator: *const c_void,
        device: *mut VkDevice,
    ) -> i32;

    pub fn vkDestroyDevice(device: VkDevice, allocator: *const c_void);

    pub fn vkGetDeviceQueue(
        device: VkDevice,
        queue_family_index: u32,
        queue_index: u32,
        queue: *mut VkQueue,
    );

    pub fn vkCreateBuffer(
        device: VkDevice,
        create_info: *const c_void,
        allocator: *const c_void,
        buffer: *mut VkBuffer,
    ) -> i32;

    pub fn vkDestroyBuffer(device: VkDevice, buffer: VkBuffer, allocator: *const c_void);

    pub fn vkAllocateMemory(
        device: VkDevice,
        allocate_info: *const c_void,
        allocator: *const c_void,
        memory: *mut VkDeviceMemory,
    ) -> i32;

    pub fn vkFreeMemory(device: VkDevice, memory: VkDeviceMemory, allocator: *const c_void);

    pub fn vkBindBufferMemory(
        device: VkDevice,
        buffer: VkBuffer,
        memory: VkDeviceMemory,
        memory_offset: u64,
    ) -> i32;

    pub fn vkMapMemory(
        device: VkDevice,
        memory: VkDeviceMemory,
        offset: u64,
        size: u64,
        flags: u32,
        data: *mut *mut c_void,
    ) -> i32;

    pub fn vkUnmapMemory(device: VkDevice, memory: VkDeviceMemory);

    pub fn vkCreateComputePipelines(
        device: VkDevice,
        pipeline_cache: *mut c_void,
        create_info_count: u32,
        create_infos: *const c_void,
        allocator: *const c_void,
        pipelines: *mut VkPipeline,
    ) -> i32;

    pub fn vkDestroyPipeline(device: VkDevice, pipeline: VkPipeline, allocator: *const c_void);

    pub fn vkAllocateCommandBuffers(
        device: VkDevice,
        allocate_info: *const c_void,
        command_buffers: *mut VkCommandBuffer,
    ) -> i32;

    pub fn vkFreeCommandBuffers(
        device: VkDevice,
        command_pool: *mut c_void,
        command_buffer_count: u32,
        command_buffers: *const VkCommandBuffer,
    );

    pub fn vkBeginCommandBuffer(command_buffer: VkCommandBuffer, begin_info: *const c_void) -> i32;

    pub fn vkEndCommandBuffer(command_buffer: VkCommandBuffer) -> i32;

    pub fn vkCmdBindPipeline(
        command_buffer: VkCommandBuffer,
        pipeline_bind_point: u32,
        pipeline: VkPipeline,
    );

    pub fn vkCmdBindDescriptorSets(
        command_buffer: VkCommandBuffer,
        pipeline_bind_point: u32,
        layout: *mut c_void,
        first_set: u32,
        descriptor_set_count: u32,
        descriptor_sets: *const VkDescriptorSet,
        dynamic_offset_count: u32,
        dynamic_offsets: *const u32,
    );

    pub fn vkCmdDispatch(
        command_buffer: VkCommandBuffer,
        group_count_x: u32,
        group_count_y: u32,
        group_count_z: u32,
    );

    pub fn vkQueueSubmit(
        queue: VkQueue,
        submit_count: u32,
        submits: *const c_void,
        fence: *mut c_void,
    ) -> i32;

    pub fn vkQueueWaitIdle(queue: VkQueue) -> i32;

    pub fn vkDeviceWaitIdle(device: VkDevice) -> i32;
}

/// Vulkan compute context for Android GPU acceleration
#[cfg(target_os = "android")]
pub struct VulkanComputeContext {
    instance: VkInstance,
    physical_device: VkPhysicalDevice,
    device: VkDevice,
    queue: VkQueue,
    command_buffer: VkCommandBuffer,
}

#[cfg(target_os = "android")]
impl VulkanComputeContext {
    /// Create a new Vulkan compute context
    pub fn new() -> Result<Self> {
        let instance = Self::create_instance()?;
        let physical_device = Self::select_physical_device(instance)?;
        let device = Self::create_device(physical_device)?;
        let queue = Self::get_compute_queue(device);
        let command_buffer = Self::create_command_buffer(device)?;

        Ok(Self {
            instance,
            physical_device,
            device,
            queue,
            command_buffer,
        })
    }

    /// Create Vulkan instance with Android-specific extensions
    fn create_instance() -> Result<VkInstance> {
        let mut instance = VkInstance(std::ptr::null_mut());

        // Simplified instance creation (in practice, would set up proper create info)
        let result = unsafe {
            vkCreateInstance(
                std::ptr::null(), // create_info
                std::ptr::null(), // allocator
                &mut instance,
            )
        };

        if result != VK_SUCCESS {
            return Err(TrustformersError::runtime_error(format!(
                "Failed to create Vulkan instance: {}",
                result
            )).into());
        }

        tracing::info!("Vulkan instance created successfully");
        Ok(instance)
    }

    /// Select the best physical device for compute
    fn select_physical_device(instance: VkInstance) -> Result<VkPhysicalDevice> {
        let mut device_count: u32 = 0;
        let mut devices: Vec<VkPhysicalDevice> = Vec::new();

        // Get device count
        let result = unsafe {
            vkEnumeratePhysicalDevices(instance, &mut device_count, std::ptr::null_mut())
        };

        if result != VK_SUCCESS || device_count == 0 {
            return Err(TrustformersError::runtime_error(
                "No Vulkan physical devices found".into(),
            ).into());
        }

        // Get devices
        devices.resize(device_count as usize, VkPhysicalDevice(std::ptr::null_mut()));
        let result = unsafe {
            vkEnumeratePhysicalDevices(instance, &mut device_count, devices.as_mut_ptr())
        };

        if result != VK_SUCCESS {
            return Err(TrustformersError::runtime_error(
                "Failed to enumerate Vulkan physical devices".into(),
            ).into());
        }

        // Select first device (simplified - in practice would evaluate capabilities)
        tracing::info!("Selected Vulkan physical device 0 of {}", device_count);
        Ok(devices[0])
    }

    /// Create logical device
    fn create_device(physical_device: VkPhysicalDevice) -> Result<VkDevice> {
        let mut device = VkDevice(std::ptr::null_mut());

        // Simplified device creation (in practice, would set up proper create info)
        let result = unsafe {
            vkCreateDevice(
                physical_device,
                std::ptr::null(), // create_info
                std::ptr::null(), // allocator
                &mut device,
            )
        };

        if result != VK_SUCCESS {
            return Err(TrustformersError::runtime_error(format!(
                "Failed to create Vulkan device: {}",
                result
            )).into());
        }

        tracing::info!("Vulkan logical device created successfully");
        Ok(device)
    }

    /// Get compute queue
    fn get_compute_queue(device: VkDevice) -> VkQueue {
        let mut queue = VkQueue(std::ptr::null_mut());

        // Get compute queue (simplified - assumes queue family 0 has compute)
        unsafe {
            vkGetDeviceQueue(device, 0, 0, &mut queue); // queue_family_index: 0, queue_index: 0
        }

        queue
    }

    /// Create command buffer
    fn create_command_buffer(device: VkDevice) -> Result<VkCommandBuffer> {
        let mut command_buffer = VkCommandBuffer(std::ptr::null_mut());

        // Simplified command buffer creation
        let result = unsafe {
            vkAllocateCommandBuffers(
                device,
                std::ptr::null(), // allocate_info
                &mut command_buffer,
            )
        };

        if result != VK_SUCCESS {
            return Err(TrustformersError::runtime_error(format!(
                "Failed to create Vulkan command buffer: {}",
                result
            )).into());
        }

        Ok(command_buffer)
    }

    /// Create compute pipeline for a specific operation
    pub fn create_compute_pipeline(&self, operation: ComputeOperation) -> Result<VkPipeline> {
        let mut pipeline = VkPipeline(std::ptr::null_mut());

        // Simplified compute pipeline creation
        let result = unsafe {
            vkCreateComputePipelines(
                self.device,
                std::ptr::null_mut(), // pipeline_cache
                1,                    // create_info_count
                std::ptr::null(),     // create_infos (would contain actual pipeline info)
                std::ptr::null(),     // allocator
                &mut pipeline,
            )
        };

        if result != VK_SUCCESS {
            return Err(TrustformersError::runtime_error(format!(
                "Failed to create Vulkan {:?} pipeline: {}",
                operation, result
            )).into());
        }

        tracing::info!("Created Vulkan {:?} compute pipeline", operation);
        Ok(pipeline)
    }

    /// Execute compute operation
    pub fn execute_compute(
        &self,
        pipeline: VkPipeline,
        group_count_x: u32,
        group_count_y: u32,
        group_count_z: u32,
    ) -> Result<()> {
        // Begin command buffer
        let result = unsafe {
            vkBeginCommandBuffer(self.command_buffer, std::ptr::null())
        };
        if result != VK_SUCCESS {
            return Err(TrustformersError::runtime_error(format!(
                "Failed to begin command buffer: {}",
                result
            )).into());
        }

        // Bind pipeline
        unsafe {
            vkCmdBindPipeline(
                self.command_buffer,
                VK_PIPELINE_BIND_POINT_COMPUTE,
                pipeline,
            );
        }

        // Dispatch compute work
        unsafe {
            vkCmdDispatch(self.command_buffer, group_count_x, group_count_y, group_count_z);
        }

        // End command buffer
        let result = unsafe { vkEndCommandBuffer(self.command_buffer) };
        if result != VK_SUCCESS {
            return Err(TrustformersError::runtime_error(format!(
                "Failed to end command buffer: {}",
                result
            )).into());
        }

        // Submit to queue
        let result = unsafe {
            vkQueueSubmit(
                self.queue,
                1,                    // submit_count
                std::ptr::null(),     // submits (would contain actual submit info)
                std::ptr::null_mut(), // fence
            )
        };
        if result != VK_SUCCESS {
            return Err(TrustformersError::runtime_error(format!(
                "Failed to submit to queue: {}",
                result
            )).into());
        }

        // Wait for completion
        let result = unsafe { vkQueueWaitIdle(self.queue) };
        if result != VK_SUCCESS {
            return Err(TrustformersError::runtime_error(format!(
                "Failed to wait for queue idle: {}",
                result
            )).into());
        }

        Ok(())
    }

    /// Create buffer for compute operations
    pub fn create_buffer(&self, size: u64, usage: u32) -> Result<(VkBuffer, VkDeviceMemory)> {
        let mut buffer = VkBuffer(std::ptr::null_mut());
        let mut memory = VkDeviceMemory(std::ptr::null_mut());

        // Create buffer
        let result = unsafe {
            vkCreateBuffer(
                self.device,
                std::ptr::null(), // create_info (would contain actual buffer info)
                std::ptr::null(), // allocator
                &mut buffer,
            )
        };

        if result != VK_SUCCESS {
            return Err(TrustformersError::runtime_error(format!(
                "Failed to create Vulkan buffer: {}",
                result
            )).into());
        }

        // Allocate memory
        let result = unsafe {
            vkAllocateMemory(
                self.device,
                std::ptr::null(), // allocate_info (would contain actual memory requirements)
                std::ptr::null(), // allocator
                &mut memory,
            )
        };

        if result != VK_SUCCESS {
            unsafe {
                vkDestroyBuffer(self.device, buffer, std::ptr::null());
            }
            return Err(TrustformersError::runtime_error(format!(
                "Failed to allocate Vulkan memory: {}",
                result
            )).into());
        }

        // Bind buffer memory
        let result = unsafe { vkBindBufferMemory(self.device, buffer, memory, 0) };
        if result != VK_SUCCESS {
            unsafe {
                vkFreeMemory(self.device, memory, std::ptr::null());
                vkDestroyBuffer(self.device, buffer, std::ptr::null());
            }
            return Err(TrustformersError::runtime_error(format!(
                "Failed to bind buffer memory: {}",
                result
            )).into());
        }

        Ok((buffer, memory))
    }

    /// Map buffer memory for CPU access
    pub fn map_memory(&self, memory: VkDeviceMemory, size: u64) -> Result<*mut c_void> {
        let mut data: *mut c_void = std::ptr::null_mut();

        let result = unsafe {
            vkMapMemory(self.device, memory, 0, size, 0, &mut data)
        };

        if result != VK_SUCCESS {
            return Err(TrustformersError::runtime_error(format!(
                "Failed to map Vulkan memory: {}",
                result
            )).into());
        }

        Ok(data)
    }

    /// Unmap buffer memory
    pub fn unmap_memory(&self, memory: VkDeviceMemory) {
        unsafe {
            vkUnmapMemory(self.device, memory);
        }
    }

    /// Destroy buffer and free memory
    pub fn destroy_buffer(&self, buffer: VkBuffer, memory: VkDeviceMemory) {
        unsafe {
            vkDestroyBuffer(self.device, buffer, std::ptr::null());
            vkFreeMemory(self.device, memory, std::ptr::null());
        }
    }

    /// Destroy pipeline
    pub fn destroy_pipeline(&self, pipeline: VkPipeline) {
        unsafe {
            vkDestroyPipeline(self.device, pipeline, std::ptr::null());
        }
    }

    /// Get device handle
    pub fn get_device(&self) -> VkDevice {
        self.device
    }

    /// Get queue handle
    pub fn get_queue(&self) -> VkQueue {
        self.queue
    }

    /// Get command buffer handle
    pub fn get_command_buffer(&self) -> VkCommandBuffer {
        self.command_buffer
    }
}

#[cfg(target_os = "android")]
impl Drop for VulkanComputeContext {
    fn drop(&mut self) {
        unsafe {
            // Clean up in reverse order
            vkDeviceWaitIdle(self.device);
            vkDestroyDevice(self.device, std::ptr::null());
            vkDestroyInstance(self.instance, std::ptr::null());
        }
        tracing::info!("Vulkan context destroyed");
    }
}

/// Supported compute operations
#[derive(Debug, Clone, Copy)]
pub enum ComputeOperation {
    Conv2D,
    ReLU,
    MatMul,
    Add,
    Pool2D,
}

/// Check if Vulkan is available on the device
pub fn is_vulkan_available() -> bool {
    #[cfg(target_os = "android")]
    {
        // In practice, would check for libvulkan.so and API level 24+
        true
    }
    #[cfg(not(target_os = "android"))]
    {
        false
    }
}

/// Vulkan utility functions
pub mod utils {
    use super::*;

    /// Convert Vulkan result to human-readable string
    pub fn vk_result_to_string(result: i32) -> &'static str {
        match result {
            VK_SUCCESS => "Success",
            VK_NOT_READY => "Not ready",
            VK_TIMEOUT => "Timeout",
            VK_ERROR_OUT_OF_HOST_MEMORY => "Out of host memory",
            VK_ERROR_OUT_OF_DEVICE_MEMORY => "Out of device memory",
            VK_ERROR_INITIALIZATION_FAILED => "Initialization failed",
            VK_ERROR_DEVICE_LOST => "Device lost",
            VK_ERROR_MEMORY_MAP_FAILED => "Memory map failed",
            _ => "Unknown error",
        }
    }

    /// Check if Vulkan result indicates success
    pub fn vk_is_success(result: i32) -> bool {
        result == VK_SUCCESS
    }
}

// Stub implementations for non-Android platforms
#[cfg(not(target_os = "android"))]
pub struct VulkanComputeContext;

#[cfg(not(target_os = "android"))]
impl VulkanComputeContext {
    pub fn new() -> Result<Self> {
        Err(TrustformersError::runtime_error(
            "Vulkan is only available on Android".into(),
        ))
    }
}

// Make handles Send/Sync for multithreading
#[cfg(target_os = "android")]
unsafe impl Send for VkInstance {}
#[cfg(target_os = "android")]
unsafe impl Sync for VkInstance {}
#[cfg(target_os = "android")]
unsafe impl Send for VkDevice {}
#[cfg(target_os = "android")]
unsafe impl Sync for VkDevice {}
#[cfg(target_os = "android")]
unsafe impl Send for VkQueue {}
#[cfg(target_os = "android")]
unsafe impl Sync for VkQueue {}

#[cfg(test)]
mod tests {
    use super::*;
    use super::utils::*;

    #[test]
    fn test_vulkan_constants() {
        assert_eq!(VK_SUCCESS, 0);
        assert_eq!(VK_PIPELINE_BIND_POINT_COMPUTE, 1);
    }

    #[test]
    fn test_result_handling() {
        assert!(vk_is_success(VK_SUCCESS).into());
        assert!(!vk_is_success(VK_ERROR_OUT_OF_HOST_MEMORY));

        assert_eq!(vk_result_to_string(VK_SUCCESS), "Success");
        assert_eq!(vk_result_to_string(VK_ERROR_OUT_OF_HOST_MEMORY), "Out of host memory");
    }

    #[test]
    fn test_availability() {
        let _available = is_vulkan_available();
    }

    #[cfg(target_os = "android")]
    #[test]
    fn test_context_creation() {
        let context = VulkanComputeContext::new();
        if context.is_err() {
            // Vulkan might not be available in test environment
            return;
        }

        let context = context.expect("operation failed in test");
        assert!(!context.get_device().0.is_null());
        assert!(!context.get_queue().0.is_null());
    }
}