/*
   Copyright The containerd Authors.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package composer

import (
	"context"
	"fmt"

	containerd "github.com/containerd/containerd/v2/client"
	"github.com/containerd/log"

	"github.com/containerd/nerdctl/v2/pkg/labels"
)

func (c *Composer) Containers(ctx context.Context, services ...string) ([]containerd.Container, error) {
	projectLabel := fmt.Sprintf("labels.%q==%s", labels.ComposeProject, c.project.Name)
	filters := []string{}
	for _, service := range services {
		filters = append(filters, fmt.Sprintf("%s,labels.%q==%s", projectLabel, labels.ComposeService, service))
	}
	if len(services) == 0 {
		filters = append(filters, projectLabel)
	}
	log.G(ctx).Debugf("filters: %v", filters)
	containers, err := c.client.Containers(ctx, filters...)
	if err != nil {
		return nil, err
	}
	return containers, nil
}

func (c *Composer) containerExists(ctx context.Context, name, service string) (bool, error) {
	// get list of containers for service
	containers, err := c.Containers(ctx, service)
	if err != nil {
		return false, err
	}

	for _, container := range containers {
		containerLabels, err := container.Labels(ctx)
		if err != nil {
			return false, err
		}
		if name == containerLabels[labels.Name] {
			// container exists
			return true, nil
		}
	}
	// container doesn't exist
	return false, nil
}

func (c *Composer) containerID(ctx context.Context, name, service string) (string, error) {
	// get list of containers for service
	containers, err := c.Containers(ctx, service)
	if err != nil {
		return "", err
	}

	for _, container := range containers {
		containerLabels, err := container.Labels(ctx)
		if err != nil {
			return "", err
		}
		if name == containerLabels[labels.Name] {
			// container exists
			return container.ID(), nil
		}
	}
	// container doesn't exist
	return "", nil
}