package main

import (
	"context"
	"fmt"
	"os"
	"reflect"
	"regexp"
	"sort"
	"strings"

	"github.com/containers/buildah"
	"github.com/containers/libpod/libpod"
	"github.com/containers/libpod/pkg/rootless"
	"github.com/containers/storage"
	"github.com/fatih/camelcase"
	"github.com/pkg/errors"
	"github.com/urfave/cli"
)

var (
	stores     = make(map[storage.Store]struct{})
	LatestFlag = cli.BoolFlag{
		Name:  "latest, l",
		Usage: "act on the latest container podman is aware of",
	}
	LatestPodFlag = cli.BoolFlag{
		Name:  "latest, l",
		Usage: "act on the latest pod podman is aware of",
	}
)

const (
	idTruncLength = 12
)

func splitCamelCase(src string) string {
	entries := camelcase.Split(src)
	return strings.Join(entries, " ")
}

func shortID(id string) string {
	if len(id) > idTruncLength {
		return id[:idTruncLength]
	}
	return id
}

func usageErrorHandler(context *cli.Context, err error, _ bool) error {
	cmd := context.App.Name
	if len(context.Command.Name) > 0 {
		cmd = cmd + " " + context.Command.Name
	}
	return fmt.Errorf("%s\nSee '%s --help'.", err, cmd)
}

func commandNotFoundHandler(context *cli.Context, command string) {
	fmt.Fprintf(os.Stderr, "Command %q not found.\nSee `%s --help`.\n", command, context.App.Name)
	os.Exit(exitCode)
}

// validateFlags searches for StringFlags or StringSlice flags that never had
// a value set.  This commonly occurs when the CLI mistakenly takes the next
// option and uses it as a value.
func validateFlags(c *cli.Context, flags []cli.Flag) error {
	for _, flag := range flags {
		switch reflect.TypeOf(flag).String() {
		case "cli.StringSliceFlag":
			{
				f := flag.(cli.StringSliceFlag)
				name := strings.Split(f.Name, ",")
				val := c.StringSlice(name[0])
				for _, v := range val {
					if ok, _ := regexp.MatchString("^-.+", v); ok {
						return errors.Errorf("option --%s requires a value", name[0])
					}
				}
			}
		case "cli.StringFlag":
			{
				f := flag.(cli.StringFlag)
				name := strings.Split(f.Name, ",")
				val := c.String(name[0])
				if ok, _ := regexp.MatchString("^-.+", val); ok {
					return errors.Errorf("option --%s requires a value", name[0])
				}
			}
		}
	}
	return nil
}

// checkAllAndLatest checks that --all and --latest are used correctly
func checkAllAndLatest(c *cli.Context) error {
	argLen := len(c.Args())
	if (c.Bool("all") || c.Bool("latest")) && argLen > 0 {
		return errors.Errorf("no arguments are needed with --all or --latest")
	}
	if c.Bool("all") && c.Bool("latest") {
		return errors.Errorf("--all and --latest cannot be used together")
	}
	if argLen < 1 && !c.Bool("all") && !c.Bool("latest") {
		return errors.Errorf("you must provide at least one pod name or id")
	}
	return nil
}

// getAllOrLatestContainers tries to return the correct list of containers
// depending if --all, --latest or <container-id> is used.
// It requires the Context (c) and the Runtime (runtime). As different
// commands are using different container state for the --all option
// the desired state has to be specified in filterState. If no filter
// is desired a -1 can be used to get all containers. For a better
// error message, if the filter fails, a corresponding verb can be
// specified which will then appear in the error message.
func getAllOrLatestContainers(c *cli.Context, runtime *libpod.Runtime, filterState libpod.ContainerStatus, verb string) ([]*libpod.Container, error) {
	var containers []*libpod.Container
	var lastError error
	var err error
	if c.Bool("all") {
		if filterState != -1 {
			var filterFuncs []libpod.ContainerFilter
			filterFuncs = append(filterFuncs, func(c *libpod.Container) bool {
				state, _ := c.State()
				return state == filterState
			})
			containers, err = runtime.GetContainers(filterFuncs...)
		} else {
			containers, err = runtime.GetContainers()
		}
		if err != nil {
			return nil, errors.Wrapf(err, "unable to get %s containers", verb)
		}
	} else if c.Bool("latest") {
		lastCtr, err := runtime.GetLatestContainer()
		if err != nil {
			return nil, errors.Wrapf(err, "unable to get latest container")
		}
		containers = append(containers, lastCtr)
	} else {
		args := c.Args()
		for _, i := range args {
			container, err := runtime.LookupContainer(i)
			if err != nil {
				if lastError != nil {
					fmt.Fprintln(os.Stderr, lastError)
				}
				lastError = errors.Wrapf(err, "unable to find container %s", i)
			}
			if container != nil {
				// This is here to make sure this does not return [<nil>] but only nil
				containers = append(containers, container)
			}
		}
	}

	return containers, lastError
}

// getContext returns a non-nil, empty context
func getContext() context.Context {
	return context.TODO()
}

func getDefaultNetwork() string {
	if rootless.IsRootless() {
		return "slirp4netns"
	}
	return "bridge"
}

// Common flags shared between commands
var createFlags = []cli.Flag{
	cli.StringSliceFlag{
		Name:  "add-host",
		Usage: "Add a custom host-to-IP mapping (host:ip) (default [])",
	},
	cli.StringSliceFlag{
		Name:  "annotation",
		Usage: "Add annotations to container (key:value) (default [])",
	},
	cli.StringSliceFlag{
		Name:  "attach, a",
		Usage: "Attach to STDIN, STDOUT or STDERR (default [])",
	},
	cli.StringFlag{
		Name:  "blkio-weight",
		Usage: "Block IO weight (relative weight) accepts a weight value between 10 and 1000.",
	},
	cli.StringSliceFlag{
		Name:  "blkio-weight-device",
		Usage: "Block IO weight (relative device weight, format: `DEVICE_NAME:WEIGHT`)",
	},
	cli.StringSliceFlag{
		Name:  "cap-add",
		Usage: "Add capabilities to the container",
	},
	cli.StringSliceFlag{
		Name:  "cap-drop",
		Usage: "Drop capabilities from the container",
	},
	cli.StringFlag{
		Name:  "cgroup-parent",
		Usage: "Optional parent cgroup for the container",
	},
	cli.StringFlag{
		Name:  "cidfile",
		Usage: "Write the container ID to the file",
	},
	cli.StringFlag{
		Name:  "conmon-pidfile",
		Usage: "path to the file that will receive the PID of conmon",
	},
	cli.Uint64Flag{
		Name:  "cpu-period",
		Usage: "Limit the CPU CFS (Completely Fair Scheduler) period",
	},
	cli.Int64Flag{
		Name:  "cpu-quota",
		Usage: "Limit the CPU CFS (Completely Fair Scheduler) quota",
	},
	cli.Uint64Flag{
		Name:  "cpu-rt-period",
		Usage: "Limit the CPU real-time period in microseconds",
	},
	cli.Int64Flag{
		Name:  "cpu-rt-runtime",
		Usage: "Limit the CPU real-time runtime in microseconds",
	},
	cli.Uint64Flag{
		Name:  "cpu-shares",
		Usage: "CPU shares (relative weight)",
	},
	cli.Float64Flag{
		Name:  "cpus",
		Usage: "Number of CPUs. The default is 0.000 which means no limit",
	},
	cli.StringFlag{
		Name:  "cpuset-cpus",
		Usage: "CPUs in which to allow execution (0-3, 0,1)",
	},
	cli.StringFlag{
		Name:  "cpuset-mems",
		Usage: "Memory nodes (MEMs) in which to allow execution (0-3, 0,1). Only effective on NUMA systems.",
	},
	cli.BoolFlag{
		Name:  "detach, d",
		Usage: "Run container in background and print container ID",
	},
	cli.StringFlag{
		Name:  "detach-keys",
		Usage: "Override the key sequence for detaching a container. Format is a single character `[a-Z]` or `ctrl-<value>` where `<value>` is one of: `a-z`, `@`, `^`, `[`, `,` or `_`",
	},
	cli.StringSliceFlag{
		Name:  "device",
		Usage: "Add a host device to the container (default [])",
	},
	cli.StringSliceFlag{
		Name:  "device-read-bps",
		Usage: "Limit read rate (bytes per second) from a device (e.g. --device-read-bps=/dev/sda:1mb)",
	},
	cli.StringSliceFlag{
		Name:  "device-read-iops",
		Usage: "Limit read rate (IO per second) from a device (e.g. --device-read-iops=/dev/sda:1000)",
	},
	cli.StringSliceFlag{
		Name:  "device-write-bps",
		Usage: "Limit write rate (bytes per second) to a device (e.g. --device-write-bps=/dev/sda:1mb)",
	},
	cli.StringSliceFlag{
		Name:  "device-write-iops",
		Usage: "Limit write rate (IO per second) to a device (e.g. --device-write-iops=/dev/sda:1000)",
	},
	cli.StringSliceFlag{
		Name:  "dns",
		Usage: "Set custom DNS servers",
	},
	cli.StringSliceFlag{
		Name:  "dns-opt",
		Usage: "Set custom DNS options",
	},
	cli.StringSliceFlag{
		Name:  "dns-search",
		Usage: "Set custom DNS search domains",
	},
	cli.StringFlag{
		Name:  "entrypoint",
		Usage: "Overwrite the default ENTRYPOINT of the image",
	},
	cli.StringSliceFlag{
		Name:  "env, e",
		Usage: "Set environment variables in container",
	},
	cli.StringSliceFlag{
		Name:  "env-file",
		Usage: "Read in a file of environment variables",
	},
	cli.StringSliceFlag{
		Name:  "expose",
		Usage: "Expose a port or a range of ports (default [])",
	},
	cli.StringSliceFlag{
		Name:  "gidmap",
		Usage: "GID map to use for the user namespace",
	},
	cli.StringSliceFlag{
		Name:  "group-add",
		Usage: "Add additional groups to join (default [])",
	},
	cli.BoolFlag{
		Name:   "help",
		Hidden: true,
	},
	cli.StringFlag{
		Name:  "hostname, h",
		Usage: "Set container hostname",
	},
	cli.StringFlag{
		Name:  "image-volume, builtin-volume",
		Usage: "Tells podman how to handle the builtin image volumes. The options are: 'bind', 'tmpfs', or 'ignore' (default 'bind')",
		Value: "bind",
	},
	cli.BoolFlag{
		Name:  "init",
		Usage: "Run an init binary inside the container that forwards signals and reaps processes",
	},
	cli.StringFlag{
		Name: "init-path",
		// Do not use  the Value field for setting the default value to determine user input (i.e., non-empty string)
		Usage: fmt.Sprintf("Path to the container-init binary (default: %q)", libpod.DefaultInitPath),
	},
	cli.BoolFlag{
		Name:  "interactive, i",
		Usage: "Keep STDIN open even if not attached",
	},
	cli.StringFlag{
		Name:  "ip",
		Usage: "Specify a static IPv4 address for the container",
	},
	cli.StringFlag{
		Name:  "ipc",
		Usage: "IPC namespace to use",
	},
	cli.StringFlag{
		Name:  "kernel-memory",
		Usage: "Kernel memory limit (format: `<number>[<unit>]`, where unit = b, k, m or g)",
	},
	cli.StringSliceFlag{
		Name:  "label",
		Usage: "Set metadata on container (default [])",
	},
	cli.StringSliceFlag{
		Name:  "label-file",
		Usage: "Read in a line delimited file of labels (default [])",
	},
	cli.StringFlag{
		Name:  "log-driver",
		Usage: "Logging driver for the container",
	},
	cli.StringSliceFlag{
		Name:  "log-opt",
		Usage: "Logging driver options (default [])",
	},
	cli.StringFlag{
		Name:  "mac-address",
		Usage: "Container MAC address (e.g. 92:d0:c6:0a:29:33), not currently supported",
	},
	cli.StringFlag{
		Name:  "memory, m",
		Usage: "Memory limit (format: <number>[<unit>], where unit = b, k, m or g)",
	},
	cli.StringFlag{
		Name:  "memory-reservation",
		Usage: "Memory soft limit (format: <number>[<unit>], where unit = b, k, m or g)",
	},
	cli.StringFlag{
		Name:  "memory-swap",
		Usage: "Swap limit equal to memory plus swap: '-1' to enable unlimited swap",
	},
	cli.Int64Flag{
		Name:  "memory-swappiness",
		Usage: "Tune container memory swappiness (0 to 100) (default -1)",
		Value: -1,
	},
	cli.StringFlag{
		Name:  "name",
		Usage: "Assign a name to the container",
	},
	cli.StringFlag{
		Name:  "net, network",
		Usage: "Connect a container to a network",
		Value: getDefaultNetwork(),
	},
	cli.BoolFlag{
		Name:  "oom-kill-disable",
		Usage: "Disable OOM Killer",
	},
	cli.StringFlag{
		Name:  "oom-score-adj",
		Usage: "Tune the host's OOM preferences (-1000 to 1000)",
	},
	cli.StringFlag{
		Name:  "pid",
		Usage: "PID namespace to use",
	},
	cli.Int64Flag{
		Name:  "pids-limit",
		Usage: "Tune container pids limit (set -1 for unlimited)",
	},
	cli.StringFlag{
		Name:  "pod",
		Usage: "Run container in an existing pod",
	},
	cli.BoolFlag{
		Name:  "privileged",
		Usage: "Give extended privileges to container",
	},
	cli.StringSliceFlag{
		Name:  "publish, p",
		Usage: "Publish a container's port, or a range of ports, to the host (default [])",
	},
	cli.BoolFlag{
		Name:  "publish-all, P",
		Usage: "Publish all exposed ports to random ports on the host interface",
	},
	cli.BoolFlag{
		Name:  "quiet, q",
		Usage: "Suppress output information when pulling images",
	},
	cli.BoolFlag{
		Name:  "read-only",
		Usage: "Make containers root filesystem read-only",
	},
	cli.StringFlag{
		Name:  "restart",
		Usage: "Restart is not supported.  Please use a systemd unit file for restart",
	},
	cli.BoolFlag{
		Name:  "rm",
		Usage: "Remove container (and pod if created) after exit",
	},
	cli.BoolFlag{
		Name:  "rootfs",
		Usage: "The first argument is not an image but the rootfs to the exploded container",
	},
	cli.StringSliceFlag{
		Name:  "security-opt",
		Usage: "Security Options (default [])",
	},
	cli.StringFlag{
		Name:  "shm-size",
		Usage: "Size of `/dev/shm`. The format is `<number><unit>`.",
		Value: "65536k",
	},
	cli.StringFlag{
		Name:  "stop-signal",
		Usage: "Signal to stop a container. Default is SIGTERM",
	},
	cli.IntFlag{
		Name:  "stop-timeout",
		Usage: "Timeout (in seconds) to stop a container. Default is 10",
		Value: libpod.CtrRemoveTimeout,
	},
	cli.StringSliceFlag{
		Name:  "storage-opt",
		Usage: "Storage driver options per container (default [])",
	},
	cli.StringFlag{
		Name:  "subgidname",
		Usage: "Name of range listed in /etc/subgid for use in user namespace",
	},
	cli.StringFlag{
		Name:  "subuidname",
		Usage: "Name of range listed in /etc/subuid for use in user namespace",
	},

	cli.StringSliceFlag{
		Name:  "sysctl",
		Usage: "Sysctl options (default [])",
	},
	cli.BoolTFlag{
		Name:  "systemd",
		Usage: "Run container in systemd mode if the command executable is systemd or init",
	},
	cli.StringSliceFlag{
		Name:  "tmpfs",
		Usage: "Mount a temporary filesystem (`tmpfs`) into a container (default [])",
	},
	cli.BoolFlag{
		Name:  "tty, t",
		Usage: "Allocate a pseudo-TTY for container",
	},
	cli.StringSliceFlag{
		Name:  "uidmap",
		Usage: "UID map to use for the user namespace",
	},
	cli.StringSliceFlag{
		Name:  "ulimit",
		Usage: "Ulimit options (default [])",
	},
	cli.StringFlag{
		Name:  "user, u",
		Usage: "Username or UID (format: <name|uid>[:<group|gid>])",
	},
	cli.StringFlag{
		Name:  "userns",
		Usage: "User namespace to use",
	},
	cli.StringFlag{
		Name:  "uts",
		Usage: "UTS namespace to use",
	},
	cli.StringSliceFlag{
		Name:  "mount",
		Usage: "Attach a filesystem mount to the container (default [])",
	},
	cli.StringSliceFlag{
		Name:  "volume, v",
		Usage: "Bind mount a volume into the container (default [])",
	},
	cli.StringSliceFlag{
		Name:  "volumes-from",
		Usage: "Mount volumes from the specified container(s) (default [])",
	},
	cli.StringFlag{
		Name:  "workdir, w",
		Usage: "Working `directory inside the container",
	},
}

func getFormat(c *cli.Context) (string, error) {
	format := strings.ToLower(c.String("format"))
	if strings.HasPrefix(format, buildah.OCI) {
		return buildah.OCIv1ImageManifest, nil
	}

	if strings.HasPrefix(format, buildah.DOCKER) {
		return buildah.Dockerv2ImageManifest, nil
	}
	return "", errors.Errorf("unrecognized image type %q", format)
}

func sortFlags(flags []cli.Flag) []cli.Flag {
	sort.Slice(flags, func(i, j int) bool {
		return strings.Compare(flags[i].GetName(), flags[j].GetName()) < 0
	})
	return flags
}

func getAuthFile(authfile string) string {
	if authfile != "" {
		return authfile
	}
	return os.Getenv("REGISTRY_AUTH_FILE")
}

// scrubServer removes 'http://' or 'https://' from the front of the
// server/registry string if either is there.  This will be mostly used
// for user input from 'podman login' and 'podman logout'.
func scrubServer(server string) string {
	server = strings.TrimPrefix(server, "https://")
	return strings.TrimPrefix(server, "http://")
}