package policies

import (
	"embed"
	_ "embed"
	"fmt"
	"io/fs"
	"os"
	"strings"

	"github.com/cedar-policy/cedar-go"
	"github.com/cedar-policy/cedar-go/types"
	"github.com/rs/zerolog"
	"github.com/xlgmokha/x/pkg/log"
)

//go:embed *.cedar *.json
var files embed.FS

var All *cedar.PolicySet = cedar.NewPolicySet()
var Entities cedar.EntityMap = cedar.EntityMap{}
var Logger *zerolog.Logger = log.New(os.Stderr, log.Fields{"pkg": "policies"})

func init() {
	err := fs.WalkDir(files, ".", func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}

		if d.IsDir() {
			return nil
		}

		if strings.HasSuffix(path, ".cedar") {
			content, err := fs.ReadFile(files, path)
			if err != nil {
				return err
			}

			policy := cedar.Policy{}
			if err := policy.UnmarshalCedar(content); err != nil {
				return err
			}
			policy.SetFilename(path)

			All.Add(cedar.PolicyID(path), &policy)
		} else if strings.HasSuffix(path, ".json") {
			content, err := fs.ReadFile(files, path)
			if err != nil {
				return err
			}

			if err := Entities.UnmarshalJSON(content); err != nil {
				return err
			}
		}

		return nil
	})

	if err != nil {
		Logger.Err(err)
	}
}

func Allowed(request cedar.Request) bool {
	ok, diagnostic := All.IsAuthorized(Entities, request)
	fmt.Printf("%v: %v -> %v %v%v\n", ok, request.Principal, request.Action.ID, request.Context.Map(), request.Resource.ID)

	if len(diagnostic.Errors) > 0 {
		log.New(os.Stderr, log.Fields{"errors": diagnostic.Errors})
		Logger.Error().Fields(log.Fields{"errors": diagnostic.Errors}.ToMap())
	}
	if len(diagnostic.Reasons) > 0 {
		Logger.Warn().Fields(log.Fields{"reasons": diagnostic.Reasons}.ToMap())
	}
	return ok == types.Allow
}