package provider

import (
	"fmt"
	"log"
	"sort"

	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
	"github.com/hashicorp/terraform-plugin-sdk/v2/terraform"
)

func resourceDockerContainerV1() *schema.Resource {
	return &schema.Resource{
		// This is only used for state migration, so the CRUD
		// callbacks are no longer relevant
		SchemaVersion: 1,
		Schema: map[string]*schema.Schema{
			"name": {
				Type:     schema.TypeString,
				Required: true,
				ForceNew: true,
			},

			"rm": {
				Type:     schema.TypeBool,
				Default:  false,
				Optional: true,
			},

			"read_only": {
				Type:     schema.TypeBool,
				Default:  false,
				Optional: true,
				ForceNew: true,
			},

			"start": {
				Type:     schema.TypeBool,
				Default:  true,
				Optional: true,
			},

			"attach": {
				Type:     schema.TypeBool,
				Default:  false,
				Optional: true,
			},

			"logs": {
				Type:     schema.TypeBool,
				Default:  false,
				Optional: true,
			},

			// Indicates whether the container must be running.
			//
			// An assumption is made that configured containers
			// should be running; if not, they should not be in
			// the configuration. Therefore a stopped container
			// should be started. Set to false to have the
			// provider leave the container alone.
			//
			// Actively-debugged containers are likely to be
			// stopped and started manually, and Docker has
			// some provisions for restarting containers that
			// stop. The utility here comes from the fact that
			// this will delete and re-create the container
			// following the principle that the containers
			// should be pristine when started.
			"must_run": {
				Type:     schema.TypeBool,
				Default:  true,
				Optional: true,
			},

			"exit_code": {
				Type:     schema.TypeInt,
				Computed: true,
			},

			"container_logs": {
				Type:     schema.TypeString,
				Computed: true,
			},

			// ForceNew is not true for image because we need to
			// sane this against Docker image IDs, as each image
			// can have multiple names/tags attached do it.
			"image": {
				Type:     schema.TypeString,
				Required: true,
				ForceNew: true,
			},

			"hostname": {
				Type:     schema.TypeString,
				Optional: true,
				ForceNew: true,
			},

			"domainname": {
				Type:     schema.TypeString,
				Optional: true,
				ForceNew: true,
			},

			"command": {
				Type:     schema.TypeList,
				Optional: true,
				ForceNew: true,
				Computed: true,
				Elem:     &schema.Schema{Type: schema.TypeString},
			},

			"entrypoint": {
				Type:     schema.TypeList,
				Optional: true,
				ForceNew: true,
				Computed: true,
				Elem:     &schema.Schema{Type: schema.TypeString},
			},

			"user": {
				Type:     schema.TypeString,
				Optional: true,
				ForceNew: true,
				Elem:     &schema.Schema{Type: schema.TypeString},
			},

			"dns": {
				Type:     schema.TypeSet,
				Optional: true,
				ForceNew: true,
				Computed: true,
				Elem:     &schema.Schema{Type: schema.TypeString},
				Set:      schema.HashString,
			},

			"dns_opts": {
				Type:     schema.TypeSet,
				Optional: true,
				ForceNew: true,
				Computed: true,
				Elem:     &schema.Schema{Type: schema.TypeString},
				Set:      schema.HashString,
			},

			"dns_search": {
				Type:     schema.TypeSet,
				Optional: true,
				ForceNew: true,
				Computed: true,
				Elem:     &schema.Schema{Type: schema.TypeString},
				Set:      schema.HashString,
			},

			"publish_all_ports": {
				Type:     schema.TypeBool,
				Optional: true,
				ForceNew: true,
			},

			"restart": {
				Type:             schema.TypeString,
				Optional:         true,
				ForceNew:         true,
				Default:          "no",
				ValidateDiagFunc: validateStringMatchesPattern(`^(no|on-failure|always|unless-stopped)$`),
				DiffSuppressFunc: func(k, oldV, newV string, d *schema.ResourceData) bool {
					// treat "" as "no", which is Docker's default value
					if oldV == "" {
						oldV = "no"
					}
					if newV == "" {
						newV = "no"
					}
					return oldV == newV
				},
			},

			"max_retry_count": {
				Type:     schema.TypeInt,
				Optional: true,
				ForceNew: true,
			},
			"working_dir": {
				Type:     schema.TypeString,
				Optional: true,
				Computed: true,
				ForceNew: true,
			},
			"remove_volumes": {
				Type:     schema.TypeBool,
				Optional: true,
				Default:  true,
			},
			"capabilities": {
				Type:     schema.TypeSet,
				Optional: true,
				ForceNew: true,
				MaxItems: 1,
				Elem: &schema.Resource{
					Schema: map[string]*schema.Schema{
						"add": {
							Type:     schema.TypeSet,
							Optional: true,
							ForceNew: true,
							Elem:     &schema.Schema{Type: schema.TypeString},
							Set:      schema.HashString,
						},

						"drop": {
							Type:     schema.TypeSet,
							Optional: true,
							ForceNew: true,
							Elem:     &schema.Schema{Type: schema.TypeString},
							Set:      schema.HashString,
						},
					},
				},
			},
			"runtime": {
				Type:        schema.TypeString,
				Description: "Runtime to use for the container.",
				Optional:    true,
				ForceNew:    true,
				Computed:    true,
			},
			"stop_signal": {
				Type:        schema.TypeString,
				Description: "Signal to stop a container (default `SIGTERM`).",
				Optional:    true,
				ForceNew:    true,
				Computed:    true,
			},
			"stop_timeout": {
				Type:        schema.TypeInt,
				Description: "Timeout (in seconds) to stop a container.",
				Optional:    true,
				ForceNew:    true,
				Computed:    true,
			},
			"mounts": {
				Type:        schema.TypeSet,
				Description: "Specification for mounts to be added to containers created as part of the service",
				Optional:    true,
				Elem: &schema.Resource{
					Schema: map[string]*schema.Schema{
						"target": {
							Type:        schema.TypeString,
							Description: "Container path",
							Required:    true,
						},
						"source": {
							Type:        schema.TypeString,
							Description: "Mount source (e.g. a volume name, a host path)",
							Optional:    true,
						},
						"type": {
							Type:             schema.TypeString,
							Description:      "The mount type",
							Required:         true,
							ValidateDiagFunc: validateStringMatchesPattern(`^(bind|volume|tmpfs)$`),
						},
						"read_only": {
							Type:        schema.TypeBool,
							Description: "Whether the mount should be read-only",
							Optional:    true,
						},
						"bind_options": {
							Type:        schema.TypeList,
							Description: "Optional configuration for the bind type",
							Optional:    true,
							MaxItems:    1,
							Elem: &schema.Resource{
								Schema: map[string]*schema.Schema{
									"propagation": {
										Type:             schema.TypeString,
										Description:      "A propagation mode with the value",
										Optional:         true,
										ValidateDiagFunc: validateStringMatchesPattern(`^(private|rprivate|shared|rshared|slave|rslave)$`),
									},
								},
							},
						},
						"volume_options": {
							Type:        schema.TypeList,
							Description: "Optional configuration for the volume type",
							Optional:    true,
							MaxItems:    1,
							Elem: &schema.Resource{
								Schema: map[string]*schema.Schema{
									"no_copy": {
										Type:        schema.TypeBool,
										Description: "Populate volume with data from the target",
										Optional:    true,
									},
									"labels": {
										Type:        schema.TypeMap,
										Description: "User-defined key/value metadata",
										Optional:    true,
									},
									"driver_name": {
										Type:        schema.TypeString,
										Description: "Name of the driver to use to create the volume",
										Optional:    true,
									},
									"driver_options": {
										Type:        schema.TypeMap,
										Description: "key/value map of driver specific options",
										Optional:    true,
										Elem:        &schema.Schema{Type: schema.TypeString},
									},
								},
							},
						},
						"tmpfs_options": {
							Type:        schema.TypeList,
							Description: "Optional configuration for the tmpfs type",
							Optional:    true,
							MaxItems:    1,
							Elem: &schema.Resource{
								Schema: map[string]*schema.Schema{
									"size_bytes": {
										Type:        schema.TypeInt,
										Description: "The size for the tmpfs mount in bytes",
										Optional:    true,
									},
									"mode": {
										Type:        schema.TypeInt,
										Description: "The permission mode for the tmpfs mount in an integer",
										Optional:    true,
									},
								},
							},
						},
					},
				},
			},
			"volumes": {
				Type:     schema.TypeSet,
				Optional: true,
				ForceNew: true,
				Elem: &schema.Resource{
					Schema: map[string]*schema.Schema{
						"from_container": {
							Type:     schema.TypeString,
							Optional: true,
							ForceNew: true,
						},

						"container_path": {
							Type:     schema.TypeString,
							Optional: true,
							ForceNew: true,
						},

						"host_path": {
							Type:             schema.TypeString,
							Optional:         true,
							ForceNew:         true,
							ValidateDiagFunc: validateDockerContainerPath(),
						},

						"volume_name": {
							Type:     schema.TypeString,
							Optional: true,
							ForceNew: true,
						},

						"read_only": {
							Type:     schema.TypeBool,
							Optional: true,
							ForceNew: true,
						},
					},
				},
			},
			"tmpfs": {
				Type:     schema.TypeMap,
				Optional: true,
			},
			"ports": {
				Type:     schema.TypeList,
				Optional: true,
				ForceNew: true,
				Elem: &schema.Resource{
					Schema: map[string]*schema.Schema{
						"internal": {
							Type:     schema.TypeInt,
							Required: true,
							ForceNew: true,
						},

						"external": {
							Type:     schema.TypeInt,
							Optional: true,
							Computed: true,
							ForceNew: true,
						},

						"ip": {
							Type:     schema.TypeString,
							Default:  "0.0.0.0",
							Optional: true,
							ForceNew: true,
							StateFunc: func(val interface{}) string {
								// Empty IP assignments default to 0.0.0.0
								if val.(string) == "" {
									return "0.0.0.0"
								}

								return val.(string)
							},
						},

						"protocol": {
							Type:     schema.TypeString,
							Default:  "tcp",
							Optional: true,
							ForceNew: true,
						},
					},
				},
				DiffSuppressFunc: suppressIfPortsDidNotChangeForMigrationV0ToV1(),
			},

			"host": {
				Type:     schema.TypeSet,
				Optional: true,
				ForceNew: true,
				Elem: &schema.Resource{
					Schema: map[string]*schema.Schema{
						"ip": {
							Type:     schema.TypeString,
							Required: true,
							ForceNew: true,
						},

						"host": {
							Type:     schema.TypeString,
							Required: true,
							ForceNew: true,
						},
					},
				},
			},

			"ulimit": {
				Type:     schema.TypeSet,
				Optional: true,
				ForceNew: true,
				Elem: &schema.Resource{
					Schema: map[string]*schema.Schema{
						"name": {
							Type:     schema.TypeString,
							Required: true,
							ForceNew: true,
						},
						"soft": {
							Type:     schema.TypeInt,
							Required: true,
							ForceNew: true,
						},
						"hard": {
							Type:     schema.TypeInt,
							Required: true,
							ForceNew: true,
						},
					},
				},
			},

			"env": {
				Type:        schema.TypeSet,
				Description: "The environment variables to in the form of `KEY=VALUE`, e.g. `DEBUG=0`",
				Optional:    true,
				ForceNew:    true,
				Computed:    true,
				Elem:        &schema.Schema{Type: schema.TypeString},
				Set:         schema.HashString,
			},

			"links": {
				Type:       schema.TypeSet,
				Optional:   true,
				ForceNew:   true,
				Elem:       &schema.Schema{Type: schema.TypeString},
				Set:        schema.HashString,
				Deprecated: "The --link flag is a legacy feature of Docker. It may eventually be removed.",
			},

			"ip_address": {
				Type:       schema.TypeString,
				Computed:   true,
				Deprecated: "Use ip_adresses_data instead. This field exposes the data of the container's first network.",
			},

			"ip_prefix_length": {
				Type:       schema.TypeInt,
				Computed:   true,
				Deprecated: "Use ip_prefix_length from ip_adresses_data instead. This field exposes the data of the container's first network.",
			},

			"gateway": {
				Type:       schema.TypeString,
				Computed:   true,
				Deprecated: "Use gateway from ip_adresses_data instead. This field exposes the data of the container's first network.",
			},

			"bridge": {
				Type:     schema.TypeString,
				Computed: true,
			},

			"network_data": {
				Type:     schema.TypeList,
				Computed: true,
				Elem: &schema.Resource{
					Schema: map[string]*schema.Schema{
						"network_name": {
							Type:     schema.TypeString,
							Computed: true,
						},
						"ip_address": {
							Type:     schema.TypeString,
							Computed: true,
						},
						"ip_prefix_length": {
							Type:     schema.TypeInt,
							Computed: true,
						},
						"gateway": {
							Type:     schema.TypeString,
							Computed: true,
						},
						"global_ipv6_address": {
							Type:     schema.TypeString,
							Computed: true,
						},
						"global_ipv6_prefix_length": {
							Type:     schema.TypeInt,
							Computed: true,
						},
						"ipv6_gateway": {
							Type:     schema.TypeString,
							Computed: true,
						},
					},
				},
			},

			"privileged": {
				Type:     schema.TypeBool,
				Optional: true,
				ForceNew: true,
			},

			"devices": {
				Type:     schema.TypeSet,
				Optional: true,
				ForceNew: true,
				Elem: &schema.Resource{
					Schema: map[string]*schema.Schema{
						"host_path": {
							Type:     schema.TypeString,
							Required: true,
							ForceNew: true,
						},

						"container_path": {
							Type:     schema.TypeString,
							Optional: true,
							ForceNew: true,
						},

						"permissions": {
							Type:     schema.TypeString,
							Optional: true,
							ForceNew: true,
						},
					},
				},
			},

			"destroy_grace_seconds": {
				Type:     schema.TypeInt,
				Optional: true,
			},

			"labels": {
				Type:     schema.TypeMap,
				Optional: true,
				Computed: true,
				ForceNew: true,
			},

			"memory": {
				Type:             schema.TypeInt,
				Optional:         true,
				ValidateDiagFunc: validateIntegerGeqThan(0),
			},

			"memory_swap": {
				Type:             schema.TypeInt,
				Optional:         true,
				ForceNew:         true,
				ValidateDiagFunc: validateIntegerGeqThan(-1),
			},

			"shm_size": {
				Type:             schema.TypeInt,
				Optional:         true,
				ForceNew:         true,
				ValidateDiagFunc: validateIntegerGeqThan(0),
			},

			"cpu_shares": {
				Type:             schema.TypeInt,
				Optional:         true,
				ForceNew:         true,
				ValidateDiagFunc: validateIntegerGeqThan(0),
			},

			"cpu_set": {
				Type:             schema.TypeString,
				Optional:         true,
				ValidateDiagFunc: validateStringMatchesPattern(`^\d+([,-]\d+)*$`),
			},

			"log_driver": {
				Type:     schema.TypeString,
				Optional: true,
				ForceNew: true,
				Default:  "json-file",
			},

			"log_opts": {
				Type:     schema.TypeMap,
				Optional: true,
				ForceNew: true,
			},

			"network_alias": {
				Type:        schema.TypeSet,
				Optional:    true,
				ForceNew:    true,
				Elem:        &schema.Schema{Type: schema.TypeString},
				Set:         schema.HashString,
				Description: "Set an alias for the container in all specified networks",
				Deprecated:  "Use networks_advanced instead. Will be removed in v2.0.0",
			},

			"network_mode": {
				Type:     schema.TypeString,
				Optional: true,
				ForceNew: true,
			},

			"networks": {
				Type:       schema.TypeSet,
				Optional:   true,
				ForceNew:   true,
				Elem:       &schema.Schema{Type: schema.TypeString},
				Set:        schema.HashString,
				Deprecated: "Use networks_advanced instead. Will be removed in v2.0.0",
			},

			"networks_advanced": {
				Type:     schema.TypeSet,
				Optional: true,
				ForceNew: true,
				Elem: &schema.Resource{
					Schema: map[string]*schema.Schema{
						"name": {
							Type:     schema.TypeString,
							Required: true,
							ForceNew: true,
						},
						"aliases": {
							Type:     schema.TypeSet,
							Optional: true,
							ForceNew: true,
							Elem:     &schema.Schema{Type: schema.TypeString},
							Set:      schema.HashString,
						},
						"ipv4_address": {
							Type:     schema.TypeString,
							Optional: true,
							ForceNew: true,
						},
						"ipv6_address": {
							Type:     schema.TypeString,
							Optional: true,
							ForceNew: true,
						},
					},
				},
			},

			"pid_mode": {
				Type:     schema.TypeString,
				Optional: true,
				ForceNew: true,
			},
			"userns_mode": {
				Type:     schema.TypeString,
				Optional: true,
				ForceNew: true,
			},

			"upload": {
				Type:     schema.TypeSet,
				Optional: true,
				ForceNew: true,
				Elem: &schema.Resource{
					Schema: map[string]*schema.Schema{
						"content": {
							Type:     schema.TypeString,
							Optional: true,
							// This is intentional. The container is mutated once, and never updated later.
							// New configuration forces a new deployment, even with the same binaries.
							ForceNew: true,
						},
						"content_base64": {
							Type:             schema.TypeString,
							Optional:         true,
							ForceNew:         true,
							ValidateDiagFunc: validateStringIsBase64Encoded(),
						},
						"file": {
							Type:     schema.TypeString,
							Required: true,
							ForceNew: true,
						},
						"executable": {
							Type:     schema.TypeBool,
							Optional: true,
							ForceNew: true,
							Default:  false,
						},
						"source": {
							Type:     schema.TypeString,
							Optional: true,
							ForceNew: true,
						},
						"source_hash": {
							Type:     schema.TypeString,
							Optional: true,
							ForceNew: true,
						},
					},
				},
			},

			"healthcheck": {
				Type:        schema.TypeList,
				Description: "A test to perform to check that the container is healthy",
				MaxItems:    1,
				Optional:    true,
				Elem: &schema.Resource{
					Schema: map[string]*schema.Schema{
						"test": {
							Type:        schema.TypeList,
							Description: "The test to perform as list",
							Required:    true,
							Elem:        &schema.Schema{Type: schema.TypeString},
						},
						"interval": {
							Type:             schema.TypeString,
							Description:      "Time between running the check (ms|s|m|h)",
							Optional:         true,
							Default:          "0s",
							ValidateDiagFunc: validateDurationGeq0(),
						},
						"timeout": {
							Type:             schema.TypeString,
							Description:      "Maximum time to allow one check to run (ms|s|m|h)",
							Optional:         true,
							Default:          "0s",
							ValidateDiagFunc: validateDurationGeq0(),
						},
						"start_period": {
							Type:             schema.TypeString,
							Description:      "Start period for the container to initialize before counting retries towards unstable (ms|s|m|h)",
							Optional:         true,
							Default:          "0s",
							ValidateDiagFunc: validateDurationGeq0(),
						},
						"retries": {
							Type:             schema.TypeInt,
							Description:      "Consecutive failures needed to report unhealthy",
							Optional:         true,
							Default:          0,
							ValidateDiagFunc: validateIntegerGeqThan(0),
						},
					},
				},
			},

			"sysctls": {
				Type:     schema.TypeMap,
				Optional: true,
				ForceNew: true,
			},
			"ipc_mode": {
				Type:        schema.TypeString,
				Description: "IPC sharing mode for the container",
				Optional:    true,
				ForceNew:    true,
			},
			"group_add": {
				Type:        schema.TypeSet,
				Description: "Additional groups for the container user",
				Optional:    true,
				ForceNew:    true,
				Elem:        &schema.Schema{Type: schema.TypeString},
				Set:         schema.HashString,
			},
		},
	}
}

func resourceDockerContainerMigrateState(
	v int, is *terraform.InstanceState, meta interface{}) (*terraform.InstanceState, error) {
	switch v {
	case 0:
		log.Println("[INFO] Found Docker Container State v0; migrating to v1")
		return migrateDockerContainerMigrateStateV0toV1(is, meta)
	default:
		return is, fmt.Errorf("unexpected schema version: %d", v)
	}
}

func migrateDockerContainerMigrateStateV0toV1(is *terraform.InstanceState, meta interface{}) (*terraform.InstanceState, error) {
	if is.Empty() {
		log.Println("[DEBUG] Empty InstanceState; nothing to migrate.")
		return is, nil
	}

	log.Printf("[DEBUG] Docker Container Attributes before Migration: %#v", is.Attributes)

	err := updateV0ToV1PortsOrder(is, meta)

	log.Printf("[DEBUG] Docker Container Attributes after State Migration: %#v", is.Attributes)

	return is, err
}

type mappedPort struct {
	internal int
	external int
	ip       string
	protocol string
}

type byPort []mappedPort

func (s byPort) Len() int {
	return len(s)
}

func (s byPort) Swap(i, j int) {
	s[i], s[j] = s[j], s[i]
}

func (s byPort) Less(i, j int) bool {
	return s[i].internal < s[j].internal
}

func updateV0ToV1PortsOrder(is *terraform.InstanceState, meta interface{}) error {
	reader := &schema.MapFieldReader{
		Schema: resourceDockerContainer().Schema,
		Map:    schema.BasicMapReader(is.Attributes),
	}

	writer := &schema.MapFieldWriter{
		Schema: resourceDockerContainer().Schema,
	}

	result, err := reader.ReadField([]string{"ports"})
	if err != nil {
		return err
	}

	if result.Value == nil {
		return nil
	}

	// map the ports into a struct, so they can be sorted easily
	portsMapped := make([]mappedPort, 0)
	portsRaw := result.Value.([]interface{})
	for _, portRaw := range portsRaw {
		if portRaw == nil {
			continue
		}
		portTyped := portRaw.(map[string]interface{})
		portMapped := mappedPort{
			internal: portTyped["internal"].(int),
			external: portTyped["external"].(int),
			ip:       portTyped["ip"].(string),
			protocol: portTyped["protocol"].(string),
		}

		portsMapped = append(portsMapped, portMapped)
	}
	sort.Sort(byPort(portsMapped))

	// map the sorted ports to an output structure tf can write
	outputPorts := make([]interface{}, 0)
	for _, mappedPort := range portsMapped {
		outputPort := make(map[string]interface{})
		outputPort["internal"] = mappedPort.internal
		outputPort["external"] = mappedPort.external
		outputPort["ip"] = mappedPort.ip
		outputPort["protocol"] = mappedPort.protocol
		outputPorts = append(outputPorts, outputPort)
	}

	// store them back to state
	if err := writer.WriteField([]string{"ports"}, outputPorts); err != nil {
		return err
	}
	for k, v := range writer.Map() {
		is.Attributes[k] = v
	}

	return nil
}

func replaceLabelsMapFieldWithSetField(rawState map[string]interface{}) map[string]interface{} {
	if rawState == nil {
		return nil
	}
	labelMapIFace := rawState["labels"]
	if labelMapIFace != nil {
		labelMap := labelMapIFace.(map[string]interface{})
		rawState["labels"] = mapStringInterfaceToLabelList(labelMap)
	} else {
		rawState["labels"] = []interface{}{}
	}

	return rawState
}

func migrateContainerLabels(rawState map[string]interface{}) map[string]interface{} {
	if rawState == nil {
		// https://github.com/kreuzwerker/terraform-provider-docker/issues/176
		// to prevent error `assignment to entry in nil map`
		rawState = map[string]interface{}{}
	}
	replaceLabelsMapFieldWithSetField(rawState)

	m, ok := rawState["mounts"]
	if !ok || m == nil {
		// https://github.com/terraform-providers/terraform-provider-docker/issues/264
		rawState["mounts"] = []interface{}{}
		return rawState
	}

	mounts := m.([]interface{})
	newMounts := make([]interface{}, len(mounts))
	for i, mountI := range mounts {
		mount := mountI.(map[string]interface{})
		volumeOptionsList := mount["volume_options"].([]interface{})

		if len(volumeOptionsList) != 0 {
			replaceLabelsMapFieldWithSetField(volumeOptionsList[0].(map[string]interface{}))
		}
		newMounts[i] = mount
	}
	rawState["mounts"] = newMounts

	return rawState
}