/*
   Copyright 2020 Docker Compose CLI 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 compose

import (
	"context"
	"fmt"
	"os"
	"strings"

	"github.com/compose-spec/compose-go/loader"
	"github.com/compose-spec/compose-go/types"
	"github.com/mattn/go-shellwords"
	"github.com/spf13/cobra"

	"github.com/docker/cli/cli"
	"github.com/docker/compose-cli/api/compose"
	"github.com/docker/compose-cli/api/progress"
)

type runOptions struct {
	*composeOptions
	Service      string
	Command      []string
	environment  []string
	Detach       bool
	Remove       bool
	noTty        bool
	user         string
	workdir      string
	entrypoint   string
	labels       []string
	volumes      []string
	publish      []string
	useAliases   bool
	servicePorts bool
	name         string
	noDeps       bool
}

func (opts runOptions) apply(project *types.Project) error {
	target, err := project.GetService(opts.Service)
	if err != nil {
		return err
	}
	if !opts.servicePorts {
		target.Ports = []types.ServicePortConfig{}
	}
	if len(opts.publish) > 0 {
		target.Ports = []types.ServicePortConfig{}
		for _, p := range opts.publish {
			config, err := types.ParsePortConfig(p)
			if err != nil {
				return err
			}
			target.Ports = append(target.Ports, config...)
		}
	}
	if len(opts.volumes) > 0 {
		target.Volumes = []types.ServiceVolumeConfig{}
		for _, v := range opts.volumes {
			volume, err := loader.ParseVolume(v)
			if err != nil {
				return err
			}
			target.Volumes = append(target.Volumes, volume)
		}
	}

	if opts.noDeps {
		for _, s := range project.Services {
			if s.Name != opts.Service {
				project.DisabledServices = append(project.DisabledServices, s)
			}
		}
		project.Services = types.Services{target}
	}

	for i, s := range project.Services {
		if s.Name == opts.Service {
			project.Services[i] = target
			break
		}
	}
	return nil
}

func runCommand(p *projectOptions, backend compose.Service) *cobra.Command {
	opts := runOptions{
		composeOptions: &composeOptions{
			projectOptions: p,
		},
	}
	cmd := &cobra.Command{
		Use:   "run [options] [-v VOLUME...] [-p PORT...] [-e KEY=VAL...] [-l KEY=VALUE...] SERVICE [COMMAND] [ARGS...]",
		Short: "Run a one-off command on a service.",
		Args:  cobra.MinimumNArgs(1),
		PreRunE: Adapt(func(ctx context.Context, args []string) error {
			opts.Service = args[0]
			if len(args) > 1 {
				opts.Command = args[1:]
			}
			if len(opts.publish) > 0 && opts.servicePorts {
				return fmt.Errorf("--service-ports and --publish are incompatible")
			}
			return nil
		}),
		RunE: Adapt(func(ctx context.Context, args []string) error {
			return runRun(ctx, backend, opts)
		}),
	}
	flags := cmd.Flags()
	flags.BoolVarP(&opts.Detach, "detach", "d", false, "Run container in background and print container ID")
	flags.StringArrayVarP(&opts.environment, "env", "e", []string{}, "Set environment variables")
	flags.StringArrayVarP(&opts.labels, "labels", "l", []string{}, "Add or override a label")
	flags.BoolVar(&opts.Remove, "rm", false, "Automatically remove the container when it exits")
	flags.BoolVarP(&opts.noTty, "no-TTY", "T", false, "Disable pseudo-noTty allocation. By default docker compose run allocates a TTY")
	flags.StringVar(&opts.name, "name", "", " Assign a name to the container")
	flags.StringVarP(&opts.user, "user", "u", "", "Run as specified username or uid")
	flags.StringVarP(&opts.workdir, "workdir", "w", "", "Working directory inside the container")
	flags.StringVar(&opts.entrypoint, "entrypoint", "", "Override the entrypoint of the image")
	flags.BoolVar(&opts.noDeps, "no-deps", false, "Don't start linked services.")
	flags.StringArrayVarP(&opts.volumes, "volumes", "v", []string{}, "Bind mount a volume.")
	flags.StringArrayVarP(&opts.publish, "publish", "p", []string{}, "Publish a container's port(s) to the host.")
	flags.BoolVar(&opts.useAliases, "use-aliases", false, "Use the service's network useAliases in the network(s) the container connects to.")
	flags.BoolVar(&opts.servicePorts, "service-ports", false, "Run command with the service's ports enabled and mapped to the host.")

	flags.SetInterspersed(false)
	return cmd
}

func runRun(ctx context.Context, backend compose.Service, opts runOptions) error {
	project, err := setup(*opts.composeOptions, []string{opts.Service})
	if err != nil {
		return err
	}

	err = opts.apply(project)
	if err != nil {
		return err
	}

	err = progress.Run(ctx, func(ctx context.Context) error {
		return startDependencies(ctx, backend, *project, opts.Service)
	})
	if err != nil {
		return err
	}

	var entrypoint []string
	if opts.entrypoint != "" {
		entrypoint, err = shellwords.Parse(opts.entrypoint)
		if err != nil {
			return err
		}
	}

	labels := types.Labels{}
	for _, s := range opts.labels {
		parts := strings.SplitN(s, "=", 2)
		if len(parts) != 2 {
			return fmt.Errorf("label must be set as KEY=VALUE")
		}
		labels[parts[0]] = parts[1]
	}

	// start container and attach to container streams
	runOpts := compose.RunOptions{
		Name:              opts.name,
		Service:           opts.Service,
		Command:           opts.Command,
		Detach:            opts.Detach,
		AutoRemove:        opts.Remove,
		Writer:            os.Stdout,
		Reader:            os.Stdin,
		Tty:               !opts.noTty,
		WorkingDir:        opts.workdir,
		User:              opts.user,
		Environment:       opts.environment,
		Entrypoint:        entrypoint,
		Labels:            labels,
		UseNetworkAliases: opts.useAliases,
		Index:             0,
	}
	exitCode, err := backend.RunOneOffContainer(ctx, project, runOpts)
	if exitCode != 0 {
		errMsg := ""
		if err != nil {
			errMsg = err.Error()
		}
		return cli.StatusError{StatusCode: exitCode, Status: errMsg}
	}
	return err
}

func startDependencies(ctx context.Context, backend compose.Service, project types.Project, requestedServiceName string) error {
	dependencies := types.Services{}
	var requestedService types.ServiceConfig
	for _, service := range project.Services {
		if service.Name != requestedServiceName {
			dependencies = append(dependencies, service)
		} else {
			requestedService = service
		}
	}

	project.Services = dependencies
	project.DisabledServices = append(project.DisabledServices, requestedService)
	if err := backend.Create(ctx, &project, compose.CreateOptions{}); err != nil {
		return err
	}
	return backend.Start(ctx, &project, compose.StartOptions{})
}