package graph

import (
	"context"

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

func handleWorkgroups(ctx context.Context, filter *model.WorkgroupsFilter) ([]*model.Workgroup, error) {
	db, err := getDB(ctx)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	repo := model.NewWorkgroupRepository(db)

	criteria := make([]interface{}, 0)

	if filter != nil {
		if len(filter.Ids) > 0 {
			criteria = append(criteria, "id in (?)", filter.Ids)
		}
	}

	found, err := repo.FindWorkgroups(ctx, criteria...)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	workgroups := make([]*model.Workgroup, 0)

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

		if authorized {
			workgroups = append(workgroups, wg)
		}
	}

	return workgroups, nil
}

func handleJoinWorkgroup(ctx context.Context, rawWorkgroupID string) (*model.Workgroup, error) {
	user, db, err := getSessionUser(ctx)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	repo := model.NewWorkgroupRepository(db)

	workgroup, err := repo.Find(ctx, rawWorkgroupID)
	if err != nil {
		return nil, errors.WithStack(err)
	}

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

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

	workgroup, err = repo.AddUserToWorkgroup(ctx, user.ID, workgroup.ID)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	eventRepo := model.NewEventRepository(db)

	if _, err := eventRepo.Add(ctx, user, model.EventTypeJoined, workgroup); err != nil {
		return nil, errors.WithStack(err)
	}

	return workgroup, nil
}

func handleLeaveWorkgroup(ctx context.Context, workgroupID string) (*model.Workgroup, error) {
	user, db, err := getSessionUser(ctx)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	repo := model.NewWorkgroupRepository(db)

	workgroup, err := repo.Find(ctx, workgroupID)
	if err != nil {
		return nil, errors.WithStack(err)
	}

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

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

	workgroup, err = repo.RemoveUserFromWorkgroup(ctx, user.ID, workgroup.ID)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	eventRepo := model.NewEventRepository(db)

	if _, err := eventRepo.Add(ctx, user, model.EventTypeLeaved, workgroup); err != nil {
		return nil, errors.WithStack(err)
	}

	return workgroup, nil
}

func handleCreateWorkgroup(ctx context.Context, changes model.WorkgroupChanges) (*model.Workgroup, error) {
	authorized, err := isAuthorized(ctx, &model.Workgroup{}, model.ActionCreate)
	if err != nil {
		return nil, errs.WithStack(err)
	}

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

	user, db, err := getSessionUser(ctx)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	repo := model.NewWorkgroupRepository(db)

	workgroup, err := repo.CreateWorkgroup(ctx, changes)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	eventRepo := model.NewEventRepository(db)

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

	return workgroup, nil
}

func handleCloseWorkgroup(ctx context.Context, workgroupID string) (*model.Workgroup, error) {
	user, db, err := getSessionUser(ctx)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	repo := model.NewWorkgroupRepository(db)

	workgroup, err := repo.Find(ctx, workgroupID)
	if err != nil {
		return nil, errors.WithStack(err)
	}

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

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

	workgroup, err = repo.CloseWorkgroup(ctx, workgroup.ID)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	eventRepo := model.NewEventRepository(db)

	if _, err := eventRepo.Add(ctx, user, model.EventTypeClosed, workgroup); err != nil {
		return nil, errors.WithStack(err)
	}

	return workgroup, nil
}

func handleUpdateWorkgroup(ctx context.Context, workgroupID string, changes model.WorkgroupChanges) (*model.Workgroup, error) {
	user, db, err := getSessionUser(ctx)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	repo := model.NewWorkgroupRepository(db)

	workgroup, err := repo.Find(ctx, workgroupID)
	if err != nil {
		return nil, errors.WithStack(err)
	}

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

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

	workgroup, err = repo.UpdateWorkgroup(ctx, workgroup.ID, changes)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	eventRepo := model.NewEventRepository(db)

	if _, err := eventRepo.Add(ctx, user, model.EventTypeUpdated, workgroup); err != nil {
		return nil, errors.WithStack(err)
	}

	return workgroup, nil
}