package app

import (
	"fmt"

	"forge.cadoles.com/arcad/edge/pkg/app"
	"forge.cadoles.com/arcad/edge/pkg/module/util"
	"github.com/dop251/goja"
	"github.com/pkg/errors"
)

type Module struct {
	repository Repository
}

type gojaManifest struct {
	ID          string   `goja:"id" json:"id"`
	Version     string   `goja:"version" json:"version"`
	Title       string   `goja:"title" json:"title"`
	Description string   `goja:"description" json:"description"`
	Tags        []string `goja:"tags" json:"tags"`
}

func toGojaManifest(manifest *app.Manifest) *gojaManifest {
	return &gojaManifest{
		ID:          string(manifest.ID),
		Version:     manifest.Version,
		Title:       manifest.Title,
		Description: manifest.Description,
		Tags:        manifest.Tags,
	}
}

func toGojaManifests(manifests []*app.Manifest) []*gojaManifest {
	gojaManifests := make([]*gojaManifest, len(manifests))

	for i, m := range manifests {
		gojaManifests[i] = toGojaManifest(m)
	}

	return gojaManifests
}

func (m *Module) Name() string {
	return "app"
}

func (m *Module) Export(export *goja.Object) {
	if err := export.Set("list", m.list); err != nil {
		panic(errors.Wrap(err, "could not set 'list' function"))
	}

	if err := export.Set("get", m.get); err != nil {
		panic(errors.Wrap(err, "could not set 'get' function"))
	}

	if err := export.Set("getUrl", m.getURL); err != nil {
		panic(errors.Wrap(err, "could not set 'list' function"))
	}
}

func (m *Module) list(call goja.FunctionCall, rt *goja.Runtime) goja.Value {
	ctx := util.AssertContext(call.Argument(0), rt)

	manifests, err := m.repository.List(ctx)
	if err != nil {
		panic(rt.ToValue(errors.WithStack(err)))
	}

	return rt.ToValue(toGojaManifests(manifests))
}

func (m *Module) get(call goja.FunctionCall, rt *goja.Runtime) goja.Value {
	ctx := util.AssertContext(call.Argument(0), rt)
	appID := assertAppID(call.Argument(1), rt)

	manifest, err := m.repository.Get(ctx, appID)
	if err != nil {
		panic(rt.ToValue(errors.WithStack(err)))
	}

	return rt.ToValue(toGojaManifest(manifest))
}

func (m *Module) getURL(call goja.FunctionCall, rt *goja.Runtime) goja.Value {
	ctx := util.AssertContext(call.Argument(0), rt)
	appID := assertAppID(call.Argument(1), rt)

	var from string
	if len(call.Arguments) > 2 {
		from = util.AssertString(call.Argument(2), rt)
	}

	url, err := m.repository.GetURL(ctx, appID, from)
	if err != nil {
		panic(rt.ToValue(errors.WithStack(err)))
	}

	return rt.ToValue(url)
}

func ModuleFactory(repository Repository) app.ServerModuleFactory {
	return func(server *app.Server) app.ServerModule {
		return &Module{
			repository: repository,
		}
	}
}

func assertAppID(value goja.Value, rt *goja.Runtime) app.ID {
	appID, ok := value.Export().(app.ID)
	if !ok {
		rawAppID, ok := value.Export().(string)
		if !ok {
			panic(rt.NewTypeError(fmt.Sprintf("app id  must be an appid or a string, got '%T'", value.Export())))
		}

		appID = app.ID(rawAppID)
	}

	return appID
}