package azurerm

import (
	"fmt"
	"log"
	"regexp"

	"github.com/Azure/azure-sdk-for-go/services/datafactory/mgmt/2018-06-01/datafactory"
	"github.com/hashicorp/terraform/helper/schema"
	"github.com/hashicorp/terraform/helper/validation"
	"github.com/terraform-providers/terraform-provider-azurerm/azurerm/helpers/tf"
	"github.com/terraform-providers/terraform-provider-azurerm/azurerm/helpers/validate"
	"github.com/terraform-providers/terraform-provider-azurerm/azurerm/utils"
)

func resourceArmDataFactoryDatasetSQLServerTable() *schema.Resource {
	return &schema.Resource{
		Create: resourceArmDataFactoryDatasetSQLServerTableCreateOrUpdate,
		Read:   resourceArmDataFactoryDatasetSQLServerTableRead,
		Update: resourceArmDataFactoryDatasetSQLServerTableCreateOrUpdate,
		Delete: resourceArmDataFactoryDatasetSQLServerTableDelete,

		Importer: &schema.ResourceImporter{
			State: schema.ImportStatePassthrough,
		},

		Schema: map[string]*schema.Schema{
			"name": {
				Type:         schema.TypeString,
				Required:     true,
				ForceNew:     true,
				ValidateFunc: validateAzureRMDataFactoryLinkedServiceDatasetName,
			},

			"data_factory_name": {
				Type:     schema.TypeString,
				Required: true,
				ForceNew: true,
				ValidateFunc: validation.StringMatch(
					regexp.MustCompile(`^[A-Za-z0-9]+(?:-[A-Za-z0-9]+)*$`),
					`Invalid name for Data Factory, see https://docs.microsoft.com/en-us/azure/data-factory/naming-rules`,
				),
			},

			"resource_group_name": resourceGroupNameSchema(),

			"linked_service_name": {
				Type:         schema.TypeString,
				Required:     true,
				ValidateFunc: validate.NoEmptyStrings,
			},

			"table_name": {
				Type:         schema.TypeString,
				Optional:     true,
				ValidateFunc: validate.NoEmptyStrings,
			},

			"parameters": {
				Type:     schema.TypeMap,
				Optional: true,
			},

			"description": {
				Type:         schema.TypeString,
				Optional:     true,
				ValidateFunc: validate.NoEmptyStrings,
			},

			"annotations": {
				Type:     schema.TypeList,
				Optional: true,
				Elem: &schema.Schema{
					Type: schema.TypeString,
				},
			},

			"folder": {
				Type:         schema.TypeString,
				Optional:     true,
				ValidateFunc: validate.NoEmptyStrings,
			},

			"additional_properties": {
				Type:     schema.TypeMap,
				Optional: true,
			},

			"schema_column": {
				Type:     schema.TypeList,
				Optional: true,
				Elem: &schema.Resource{
					Schema: map[string]*schema.Schema{
						"name": {
							Type:         schema.TypeString,
							Required:     true,
							ValidateFunc: validate.NoEmptyStrings,
						},
						"type": {
							Type:     schema.TypeString,
							Optional: true,
							ValidateFunc: validation.StringInSlice([]string{
								"Byte",
								"Byte[]",
								"Boolean",
								"Date",
								"DateTime",
								"DateTimeOffset",
								"Decimal",
								"Double",
								"Guid",
								"Int16",
								"Int32",
								"Int64",
								"Single",
								"String",
								"TimeSpan",
							}, false),
						},
						"description": {
							Type:         schema.TypeString,
							Optional:     true,
							ValidateFunc: validate.NoEmptyStrings,
						},
					},
				},
			},
		},
	}
}

func resourceArmDataFactoryDatasetSQLServerTableCreateOrUpdate(d *schema.ResourceData, meta interface{}) error {
	client := meta.(*ArmClient).dataFactoryDatasetClient
	ctx := meta.(*ArmClient).StopContext

	name := d.Get("name").(string)
	dataFactoryName := d.Get("data_factory_name").(string)
	resourceGroup := d.Get("resource_group_name").(string)

	if requireResourcesToBeImported && d.IsNewResource() {
		existing, err := client.Get(ctx, resourceGroup, dataFactoryName, name, "")
		if err != nil {
			if !utils.ResponseWasNotFound(existing.Response) {
				return fmt.Errorf("Error checking for presence of existing Data Factory Dataset SQL Server Table %q (Data Factory %q / Resource Group %q): %s", name, dataFactoryName, resourceGroup, err)
			}
		}

		if existing.ID != nil && *existing.ID != "" {
			return tf.ImportAsExistsError("azurerm_data_factory_dataset_sql_server", *existing.ID)
		}
	}

	sqlServerDatasetProperties := datafactory.SQLServerTableDatasetTypeProperties{
		TableName: d.Get("table_name").(string),
	}

	linkedServiceName := d.Get("linked_service_name").(string)
	linkedServiceType := "LinkedServiceReference"
	linkedService := &datafactory.LinkedServiceReference{
		ReferenceName: &linkedServiceName,
		Type:          &linkedServiceType,
	}

	description := d.Get("description").(string)
	sqlServerTableset := datafactory.SQLServerTableDataset{
		SQLServerTableDatasetTypeProperties: &sqlServerDatasetProperties,
		LinkedServiceName:                   linkedService,
		Description:                         &description,
	}

	if v, ok := d.GetOk("folder"); ok {
		name := v.(string)
		sqlServerTableset.Folder = &datafactory.DatasetFolder{
			Name: &name,
		}
	}

	if v, ok := d.GetOk("parameters"); ok {
		sqlServerTableset.Parameters = expandDataFactoryParameters(v.(map[string]interface{}))
	}

	if v, ok := d.GetOk("annotations"); ok {
		annotations := v.([]interface{})
		sqlServerTableset.Annotations = &annotations
	}

	if v, ok := d.GetOk("additional_properties"); ok {
		sqlServerTableset.AdditionalProperties = v.(map[string]interface{})
	}

	if v, ok := d.GetOk("schema_column"); ok {
		sqlServerTableset.Structure = expandDataFactoryDatasetStructure(v.([]interface{}))
	}

	datasetType := string(datafactory.TypeSQLServerTable)
	dataset := datafactory.DatasetResource{
		Properties: &sqlServerTableset,
		Type:       &datasetType,
	}

	if _, err := client.CreateOrUpdate(ctx, resourceGroup, dataFactoryName, name, dataset, ""); err != nil {
		return fmt.Errorf("Error creating/updating Data Factory Dataset SQL Server Table  %q (Data Factory %q / Resource Group %q): %s", name, dataFactoryName, resourceGroup, err)
	}

	resp, err := client.Get(ctx, resourceGroup, dataFactoryName, name, "")
	if err != nil {
		return fmt.Errorf("Error retrieving Data Factory Dataset SQL Server Table %q (Data Factory %q / Resource Group %q): %s", name, dataFactoryName, resourceGroup, err)
	}

	if resp.ID == nil {
		return fmt.Errorf("Cannot read Data Factory Dataset SQL Server Table %q (Data Factory %q / Resource Group %q): %s", name, dataFactoryName, resourceGroup, err)
	}

	d.SetId(*resp.ID)

	return resourceArmDataFactoryDatasetSQLServerTableRead(d, meta)
}

func resourceArmDataFactoryDatasetSQLServerTableRead(d *schema.ResourceData, meta interface{}) error {
	client := meta.(*ArmClient).dataFactoryDatasetClient
	ctx := meta.(*ArmClient).StopContext

	id, err := parseAzureResourceID(d.Id())
	if err != nil {
		return err
	}
	resourceGroup := id.ResourceGroup
	dataFactoryName := id.Path["factories"]
	name := id.Path["datasets"]

	resp, err := client.Get(ctx, resourceGroup, dataFactoryName, name, "")
	if err != nil {
		if utils.ResponseWasNotFound(resp.Response) {
			d.SetId("")
			return nil
		}

		return fmt.Errorf("Error retrieving Data Factory Dataset SQL Server Table %q (Data Factory %q / Resource Group %q): %s", name, dataFactoryName, resourceGroup, err)
	}

	d.Set("name", resp.Name)
	d.Set("resource_group_name", resourceGroup)
	d.Set("data_factory_name", dataFactoryName)

	sqlServerTable, ok := resp.Properties.AsSQLServerTableDataset()
	if !ok {
		return fmt.Errorf("Error classifiying Data Factory Dataset SQL Server Table %q (Data Factory %q / Resource Group %q): Expected: %q Received: %q", name, dataFactoryName, resourceGroup, datafactory.TypeSQLServerTable, *resp.Type)
	}

	d.Set("additional_properties", sqlServerTable.AdditionalProperties)

	if sqlServerTable.Description != nil {
		d.Set("description", sqlServerTable.Description)
	}

	parameters := flattenDataFactoryParameters(sqlServerTable.Parameters)
	if err := d.Set("parameters", parameters); err != nil {
		return fmt.Errorf("Error setting `parameters`: %+v", err)
	}

	annotations := flattenDataFactoryAnnotations(sqlServerTable.Annotations)
	if err := d.Set("annotations", annotations); err != nil {
		return fmt.Errorf("Error setting `annotations`: %+v", err)
	}

	if linkedService := sqlServerTable.LinkedServiceName; linkedService != nil {
		if linkedService.ReferenceName != nil {
			d.Set("linked_service_name", linkedService.ReferenceName)
		}
	}

	if properties := sqlServerTable.SQLServerTableDatasetTypeProperties; properties != nil {
		val, ok := properties.TableName.(string)
		if !ok {
			log.Printf("[DEBUG] Skipping `table_name` since it's not a string")
		} else {
			d.Set("table_name", val)
		}
	}

	if folder := sqlServerTable.Folder; folder != nil {
		if folder.Name != nil {
			d.Set("folder", folder.Name)
		}
	}

	structureColumns := flattenDataFactoryStructureColumns(sqlServerTable.Structure)
	if err := d.Set("schema_column", structureColumns); err != nil {
		return fmt.Errorf("Error setting `schema_column`: %+v", err)
	}

	return nil
}

func resourceArmDataFactoryDatasetSQLServerTableDelete(d *schema.ResourceData, meta interface{}) error {
	client := meta.(*ArmClient).dataFactoryDatasetClient
	ctx := meta.(*ArmClient).StopContext

	id, err := parseAzureResourceID(d.Id())
	if err != nil {
		return err
	}
	resourceGroup := id.ResourceGroup
	dataFactoryName := id.Path["factories"]
	name := id.Path["datasets"]

	response, err := client.Delete(ctx, resourceGroup, dataFactoryName, name)
	if err != nil {
		if !utils.ResponseWasNotFound(response) {
			return fmt.Errorf("Error deleting Data Factory Dataset SQL Server Table %q (Data Factory %q / Resource Group %q): %s", name, dataFactoryName, resourceGroup, err)
		}
	}

	return nil
}
