//go:build darwin

package gpu

/*
#cgo CFLAGS: -x objective-c
#cgo LDFLAGS: -framework Foundation -framework CoreGraphics -framework Metal
#include "gpu_info_darwin.h"
*/
import "C"

import (
	"log/slog"
	"runtime"
	"syscall"

	"github.com/ollama/ollama/format"
)

const (
	metalMinimumMemory = 512 * format.MebiByte
)

func GetGPUInfo() GpuInfoList {
	mem, _ := GetCPUMem()
	if runtime.GOARCH == "amd64" {
		return []GpuInfo{
			{
				Library: "cpu",
				Variant: GetCPUCapability().String(),
				memInfo: mem,
			},
		}
	}
	info := GpuInfo{
		Library: "metal",
		ID:      "0",
	}
	info.TotalMemory = uint64(C.getRecommendedMaxVRAM())

	// TODO is there a way to gather actual allocated video memory? (currentAllocatedSize doesn't work)
	info.FreeMemory = info.TotalMemory

	info.MinimumMemory = metalMinimumMemory
	return []GpuInfo{info}
}

func GetCPUInfo() GpuInfoList {
	mem, _ := GetCPUMem()
	return []GpuInfo{
		{
			Library: "cpu",
			Variant: GetCPUCapability().String(),
			memInfo: mem,
		},
	}
}

func GetCPUMem() (memInfo, error) {
	return memInfo{
		TotalMemory: uint64(C.getPhysicalMemory()),
		FreeMemory:  uint64(C.getFreeMemory()),
		// FreeSwap omitted as Darwin uses dynamic paging
	}, nil
}

func (l GpuInfoList) GetVisibleDevicesEnv() (string, string) {
	// No-op on darwin
	return "", ""
}

func GetSystemInfo() SystemInfo {
	mem, _ := GetCPUMem()
	query := "hw.perflevel0.physicalcpu"
	perfCores, err := syscall.SysctlUint32(query)
	if err != nil {
		slog.Warn("failed to discover physical CPU details", "query", query, "error", err)
	}
	query = "hw.perflevel1.physicalcpu"
	efficiencyCores, _ := syscall.SysctlUint32(query) // On x86 xeon this wont return data

	// Determine thread count
	query = "hw.logicalcpu"
	logicalCores, _ := syscall.SysctlUint32(query)

	return SystemInfo{
		System: CPUInfo{
			GpuInfo: GpuInfo{
				memInfo: mem,
			},
			CPUs: []CPU{
				{
					CoreCount:           int(perfCores + efficiencyCores),
					EfficiencyCoreCount: int(efficiencyCores),
					ThreadCount:         int(logicalCores),
				},
			},
		},
		GPUs: GetGPUInfo(),
	}
}