package google

import (
	"errors"
	"fmt"

	"github.com/hashicorp/terraform/helper/schema"
)

func dataSourceGoogleComputeInstanceGroup() *schema.Resource {
	return &schema.Resource{
		Read: dataSourceComputeInstanceGroupRead,
		Schema: map[string]*schema.Schema{
			"name": {
				Type:          schema.TypeString,
				Optional:      true,
				ConflictsWith: []string{"self_link"},
			},

			"self_link": {
				Type:          schema.TypeString,
				Optional:      true,
				Computed:      true,
				ConflictsWith: []string{"name", "zone"},
			},

			"zone": {
				Type:          schema.TypeString,
				Optional:      true,
				Computed:      true,
				ConflictsWith: []string{"self_link"},
			},

			"project": {
				Type:     schema.TypeString,
				Optional: true,
				Computed: true,
			},

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

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

			"named_port": {
				Type:     schema.TypeList,
				Computed: true,
				Elem: &schema.Resource{
					Schema: map[string]*schema.Schema{
						"name": {
							Type:     schema.TypeString,
							Computed: true,
						},

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

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

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

func dataSourceComputeInstanceGroupRead(d *schema.ResourceData, meta interface{}) error {
	config := meta.(*Config)
	if name, ok := d.GetOk("name"); ok {
		zone, err := getZone(d, config)
		if err != nil {
			return err
		}
		d.SetId(fmt.Sprintf("%s/%s", zone, name.(string)))
	} else if selfLink, ok := d.GetOk("self_link"); ok {
		parsed, err := ParseInstanceGroupFieldValue(selfLink.(string), d, config)
		if err != nil {
			return err
		}
		d.Set("name", parsed.Name)
		d.Set("zone", parsed.Zone)
		d.Set("project", parsed.Project)
		d.SetId(fmt.Sprintf("%s/%s", parsed.Zone, parsed.Name))
	} else {
		return errors.New("Must provide either `self_link` or `zone/name`")
	}

	return resourceComputeInstanceGroupRead(d, meta)
}