package runner

import (
	"context"
	"git.0x7f.app/WOJ/woj-server/internal/e"
	"git.0x7f.app/WOJ/woj-server/internal/misc/config"
	"git.0x7f.app/WOJ/woj-server/internal/misc/log"
	"git.0x7f.app/WOJ/woj-server/pkg/pool"
	"git.0x7f.app/WOJ/woj-server/pkg/utils"
	"github.com/containerd/containerd"
	"github.com/containerd/containerd/namespaces"
	"github.com/samber/do"
	"go.uber.org/zap"
	"runtime"
	"sync/atomic"
)

var _ Service = (*service)(nil)

type Service interface {
	// EnsureDeps build docker images
	EnsureDeps() e.Status
	// NewProblem = Download + Parse + Prebuild
	NewProblem(meta *JudgeMeta, url string, force bool) (*Config, e.Status)

	// Compile compile user submission
	Compile(meta *JudgeMeta) (*JudgeStatus, e.Status)
	// RunAndJudge execute user program
	RunAndJudge(meta *JudgeMeta) (*JudgeStatus, int32, e.Status)

	// ParseConfig parse config file
	ParseConfig(meta *JudgeMeta, skipCheck bool) (*Config, error)
	// ProblemExists check if problem exists
	ProblemExists(meta *JudgeMeta) bool

	HealthCheck() error
	Shutdown() error
}

func NewService(i *do.Injector) (Service, error) {
	concurrency := utils.If(runtime.NumCPU() > 1, runtime.NumCPU()-1, 1)
	cfg := do.MustInvoke[config.Service](i).GetConfig()

	srv := &service{
		log:     do.MustInvoke[log.Service](i).GetLogger("runner"),
		pool:    pool.NewTaskPool(concurrency, concurrency),
		verbose: cfg.Development,
	}

	var err error
	srv.container.client, err = containerd.New(cfg.Runner.Address)
	if err != nil {
		srv.log.Error("failed to connect to containerd", zap.Error(err))
		return nil, err
	}

	srv.container.ctx = namespaces.WithNamespace(context.Background(), "woj")
	srv.container.count.Store(0)

	srv.pool.Start()
	return srv, nil
}

type service struct {
	log       *zap.Logger
	pool      *pool.TaskPool
	container struct {
		client *containerd.Client
		ctx    context.Context
		count  atomic.Uint64
	}
	verbose bool
}

func (s *service) HealthCheck() error {
	return nil
}

func (s *service) Shutdown() error {
	s.pool.Stop()
	if s.container.client != nil {
		// TODO: wait and kill all containers
		_ = s.container.client.Close()
	}

	return nil
}