//go:build !darwin

package llm

/*

#include <stdlib.h>
#include "dynamic_shim.h"

*/
import "C"
import (
	"context"
	"embed"
	"errors"
	"fmt"
	"io/fs"
	"log"
	"os"
	"path/filepath"
	"strings"
	"sync"
	"unsafe"

	"github.com/jmorganca/ollama/api"
)

//go:embed llama.cpp/gguf/build/lib/*
var libEmbed embed.FS

var RocmShimMissing = fmt.Errorf("ROCm shim library not included in this build of ollama. Radeon GPUs are not supported")

type shimExtServer struct {
	s       C.struct_dynamic_llama_server
	options api.Options
}

// Note: current implementation does not support concurrent instantiations
var shimMutex sync.Mutex
var llm *shimExtServer

func (llm *shimExtServer) llama_server_init(sparams *C.ext_server_params_t, err *C.ext_server_resp_t) {
	C.dynamic_shim_llama_server_init(llm.s, sparams, err)
}
func (llm *shimExtServer) llama_server_start() {
	C.dynamic_shim_llama_server_start(llm.s)
}
func (llm *shimExtServer) llama_server_stop() {
	C.dynamic_shim_llama_server_stop(llm.s)
}

func (llm *shimExtServer) llama_server_completion(json_req *C.char, resp *C.ext_server_resp_t) {
	C.dynamic_shim_llama_server_completion(llm.s, json_req, resp)
}
func (llm *shimExtServer) llama_server_completion_next_result(task_id C.int, resp *C.ext_server_task_result_t) {
	C.dynamic_shim_llama_server_completion_next_result(llm.s, task_id, resp)
}
func (llm *shimExtServer) llama_server_completion_cancel(task_id C.int, err *C.ext_server_resp_t) {
	C.dynamic_shim_llama_server_completion_cancel(llm.s, task_id, err)
}
func (llm *shimExtServer) llama_server_release_task_result(result *C.ext_server_task_result_t) {
	C.dynamic_shim_llama_server_release_task_result(llm.s, result)
}

func (llm *shimExtServer) llama_server_tokenize(json_req *C.char, json_resp **C.char, err *C.ext_server_resp_t) {
	C.dynamic_shim_llama_server_tokenize(llm.s, json_req, json_resp, err)
}
func (llm *shimExtServer) llama_server_detokenize(json_req *C.char, json_resp **C.char, err *C.ext_server_resp_t) {
	C.dynamic_shim_llama_server_detokenize(llm.s, json_req, json_resp, err)
}
func (llm *shimExtServer) llama_server_embedding(json_req *C.char, json_resp **C.char, err *C.ext_server_resp_t) {
	C.dynamic_shim_llama_server_embedding(llm.s, json_req, json_resp, err)
}
func (llm *shimExtServer) llama_server_release_json_resp(json_resp **C.char) {
	C.dynamic_shim_llama_server_release_json_resp(llm.s, json_resp)
}

func newDynamicShimExtServer(library, model string, adapters, projectors []string, numLayers int64, opts api.Options) (extServer, error) {
	shimMutex.Lock()
	defer shimMutex.Unlock()
	libPath := C.CString(library)
	defer C.free(unsafe.Pointer(libPath))
	resp := newExtServerResp(128)
	defer freeExtServerResp(resp)
	var srv C.struct_dynamic_llama_server
	C.dynamic_shim_init(libPath, &srv, &resp)
	if resp.id < 0 {
		return nil, fmt.Errorf("Unable to load dynamic library: %s", C.GoString(resp.msg))
	}
	llm = &shimExtServer{
		s:       srv,
		options: opts,
	}
	log.Printf("Loading Dynamic Shim llm server: %s", library)
	return newExtServer(llm, model, adapters, projectors, numLayers, opts)
}

func (llm *shimExtServer) Predict(ctx context.Context, pred PredictOpts, fn func(PredictResult)) error {
	return predict(llm, llm.options, ctx, pred, fn)
}

func (llm *shimExtServer) Encode(ctx context.Context, prompt string) ([]int, error) {
	return encode(llm, ctx, prompt)
}

func (llm *shimExtServer) Decode(ctx context.Context, tokens []int) (string, error) {
	return decode(llm, ctx, tokens)
}

func (llm *shimExtServer) Embedding(ctx context.Context, input string) ([]float64, error) {
	return embedding(llm, ctx, input)
}

func (llm *shimExtServer) Close() {
	close(llm)
}

func nativeInit(workdir string) error {
	libs, err := extractDynamicLibs(workdir, "llama.cpp/gguf/build/lib/*server*")
	if err != nil {
		if err == payloadMissing {
			log.Printf("%s", payloadMissing)
			return nil
		}
		return err
	}
	for _, lib := range libs {
		libName := strings.Split(strings.TrimPrefix(filepath.Base(lib), "lib"), ".")[0]
		AvailableShims[libName] = lib
	}

	// Only check ROCm access if we have the dynamic lib loaded
	if _, rocmPresent := AvailableShims["rocm_server"]; rocmPresent {
		// Verify we have permissions - either running as root, or we have group access to the driver
		fd, err := os.OpenFile("/dev/kfd", os.O_RDWR, 0666)
		if err != nil {
			if errors.Is(err, fs.ErrPermission) {
				log.Fatalf("Radeon card detected, but permissions not set up properly.  Either run ollama as root, or add you user account to the render group.")
				return err
			} else if errors.Is(err, fs.ErrNotExist) {
				// expected behavior without a radeon card
				return nil
			}

			return fmt.Errorf("failed to check permission on /dev/kfd: %w", err)
		}
		fd.Close()

	}

	return nil
}