package graph

import (
	"context"
	"reflect"

	"forge.cadoles.com/Cadoles/daddy/internal/orm"
	"gitlab.com/wpetit/goweb/middleware/container"

	"forge.cadoles.com/Cadoles/daddy/internal/model"
	errs "github.com/pkg/errors"
)

func handleCreateDecisionSupportFile(ctx context.Context, changes *model.DecisionSupportFileChanges) (*model.DecisionSupportFile, error) {
	user, db, err := getSessionUser(ctx)
	if err != nil {
		return nil, errs.WithStack(err)
	}

	authorized, err := isAuthorized(ctx, &model.DecisionSupportFile{}, model.ActionCreate)
	if err != nil {
		return nil, errs.WithStack(err)
	}

	if !authorized {
		return nil, errs.WithStack(ErrForbidden)
	}

	repo := model.NewDSFRepository(db)

	dsf, err := repo.Create(ctx, changes)
	if err != nil {
		return nil, errs.WithStack(err)
	}

	eventRepo := model.NewEventRepository(db)

	if _, err := eventRepo.Add(ctx, user, model.EventTypeCreated, dsf); err != nil {
		return nil, errs.WithStack(err)
	}

	return dsf, nil
}

func handleUpdateDecisionSupportFile(ctx context.Context, id string, changes *model.DecisionSupportFileChanges) (*model.DecisionSupportFile, error) {
	user, db, err := getSessionUser(ctx)
	if err != nil {
		return nil, errs.WithStack(err)
	}

	repo := model.NewDSFRepository(db)

	prevDsf, err := repo.Find(ctx, id)
	if err != nil {
		return nil, errs.WithStack(err)
	}

	authorized, err := isAuthorized(ctx, prevDsf, model.ActionUpdate)
	if err != nil {
		return nil, errs.WithStack(err)
	}

	if !authorized {
		return nil, errs.WithStack(ErrForbidden)
	}

	dsf, err := repo.Update(ctx, id, changes)
	if err != nil {
		return nil, errs.WithStack(err)
	}

	eventRepo := model.NewEventRepository(db)

	if changes != nil && changes.Status != nil && prevDsf.Status != *changes.Status {
		switch *changes.Status {
		case model.StatusVoted:
			if _, err := eventRepo.Add(ctx, user, model.EventTypeVoted, dsf); err != nil {
				return nil, errs.WithStack(err)
			}
		case model.StatusClosed:
			if _, err := eventRepo.Add(ctx, user, model.EventTypeClosed, dsf); err != nil {
				return nil, errs.WithStack(err)
			}
		default:
			if _, err := eventRepo.Add(ctx, user, model.EventTypeStatusChanged, dsf); err != nil {
				return nil, errs.WithStack(err)
			}
		}
	}

	if changes != nil && changes.Title != nil && prevDsf.Title != *changes.Title {
		if _, err := eventRepo.Add(ctx, user, model.EventTypeTitleChanged, dsf); err != nil {
			return nil, errs.WithStack(err)
		}
	}

	if changes != nil && !reflect.DeepEqual(prevDsf.Sections, dsf.Sections) {
		if _, err := eventRepo.Add(ctx, user, model.EventTypeUpdated, dsf); err != nil {
			return nil, errs.WithStack(err)
		}
	}

	return dsf, nil
}

func handleDecisionSupportFiles(ctx context.Context, filter *model.DecisionSupportFileFilter) ([]*model.DecisionSupportFile, error) {
	ctn := container.Must(ctx)
	db := orm.Must(ctn).DB()

	repo := model.NewDSFRepository(db)

	found, err := repo.Search(ctx, filter)
	if err != nil {
		return nil, errs.WithStack(err)
	}

	dsfs := make([]*model.DecisionSupportFile, 0)

	for _, d := range found {
		authorized, err := isAuthorized(ctx, d, model.ActionRead)
		if err != nil {
			return nil, errs.WithStack(err)
		}

		if authorized {
			dsfs = append(dsfs, d)
		}
	}

	return dsfs, nil
}