package aws

import (
	"bytes"
	"fmt"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/service/ec2"
	"github.com/hashicorp/terraform/helper/hashcode"
	"github.com/hashicorp/terraform/helper/schema"
)

func dataSourceTagsHash(v interface{}) int {
	var buf bytes.Buffer
	m := v.(map[string]interface{})
	buf.WriteString(fmt.Sprintf("%s-", m["key"].(string)))
	buf.WriteString(fmt.Sprintf("%s-", m["value"].(string)))
	return hashcode.String(buf.String())
}

func dataSourceTags(m []*ec2.Tag) *schema.Set {
	s := &schema.Set{
		F: dataSourceTagsHash,
	}
	for _, v := range m {
		tag := map[string]interface{}{
			"key":   *v.Key,
			"value": *v.Value,
		}
		s.Add(tag)
	}
	return s
}

func buildAwsDataSourceFilters(set *schema.Set) []*ec2.Filter {
	var filters []*ec2.Filter
	for _, v := range set.List() {
		m := v.(map[string]interface{})
		var filterValues []*string
		for _, e := range m["values"].([]interface{}) {
			filterValues = append(filterValues, aws.String(e.(string)))
		}
		filters = append(filters, &ec2.Filter{
			Name:   aws.String(m["name"].(string)),
			Values: filterValues,
		})
	}
	return filters
}

func dataSourceFiltersSchema() *schema.Schema {
	return &schema.Schema{
		Type:     schema.TypeSet,
		Optional: true,
		ForceNew: true,
		Elem: &schema.Resource{
			Schema: map[string]*schema.Schema{
				"name": {
					Type:     schema.TypeString,
					Required: true,
				},

				"values": {
					Type:     schema.TypeList,
					Required: true,
					Elem:     &schema.Schema{Type: schema.TypeString},
				},
			},
		},
	}
}

func dataSourceTagsSchema() *schema.Schema {
	return &schema.Schema{
		Type:     schema.TypeSet,
		Computed: true,
		Set:      dataSourceTagsHash,
		Elem: &schema.Resource{
			Schema: map[string]*schema.Schema{
				"key": {
					Type:     schema.TypeString,
					Computed: true,
				},
				"value": {
					Type:     schema.TypeString,
					Computed: true,
				},
			},
		},
	}
}