package wafv2

import (
	"context"
	"fmt"
	"log"
	"regexp"
	"strings"
	"time"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/service/wafv2"
	"github.com/hashicorp/aws-sdk-go-base/v2/awsv1shim/v2/tfawserr"
	"github.com/hashicorp/terraform-plugin-sdk/v2/diag"
	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/validation"
	"github.com/hashicorp/terraform-provider-aws/internal/conns"
	tftags "github.com/hashicorp/terraform-provider-aws/internal/tags"
	"github.com/hashicorp/terraform-provider-aws/internal/tfresource"
	"github.com/hashicorp/terraform-provider-aws/internal/verify"
)

const (
	webACLCreateTimeout = 5 * time.Minute
	webACLUpdateTimeout = 5 * time.Minute
	webACLDeleteTimeout = 5 * time.Minute
)

func ResourceWebACL() *schema.Resource {
	return &schema.Resource{
		CreateWithoutTimeout: resourceWebACLCreate,
		ReadWithoutTimeout:   resourceWebACLRead,
		UpdateWithoutTimeout: resourceWebACLUpdate,
		DeleteWithoutTimeout: resourceWebACLDelete,

		Importer: &schema.ResourceImporter{
			State: func(d *schema.ResourceData, meta interface{}) ([]*schema.ResourceData, error) {
				idParts := strings.Split(d.Id(), "/")
				if len(idParts) != 3 || idParts[0] == "" || idParts[1] == "" || idParts[2] == "" {
					return nil, fmt.Errorf("Unexpected format of ID (%q), expected ID/NAME/SCOPE", d.Id())
				}
				id := idParts[0]
				name := idParts[1]
				scope := idParts[2]
				d.SetId(id)
				d.Set("name", name)
				d.Set("scope", scope)
				return []*schema.ResourceData{d}, nil
			},
		},

		Schema: map[string]*schema.Schema{
			"arn": {
				Type:     schema.TypeString,
				Computed: true,
			},
			"capacity": {
				Type:     schema.TypeInt,
				Computed: true,
			},
			"custom_response_body": customResponseBodySchema(),
			"default_action": {
				Type:     schema.TypeList,
				Required: true,
				MaxItems: 1,
				Elem: &schema.Resource{
					Schema: map[string]*schema.Schema{
						"allow": allowConfigSchema(),
						"block": blockConfigSchema(),
					},
				},
			},
			"description": {
				Type:         schema.TypeString,
				Optional:     true,
				ValidateFunc: validation.StringLenBetween(1, 256),
			},
			"lock_token": {
				Type:     schema.TypeString,
				Computed: true,
			},
			"name": {
				Type:     schema.TypeString,
				Required: true,
				ForceNew: true,
				ValidateFunc: validation.All(
					validation.StringLenBetween(1, 128),
					validation.StringMatch(regexp.MustCompile(`^[a-zA-Z0-9-_]+$`), "must contain only alphanumeric hyphen and underscore characters"),
				),
			},
			"rule": {
				Type:     schema.TypeSet,
				Optional: true,
				Elem: &schema.Resource{
					Schema: map[string]*schema.Schema{
						"action": {
							Type:     schema.TypeList,
							Optional: true,
							MaxItems: 1,
							Elem: &schema.Resource{
								Schema: map[string]*schema.Schema{
									"allow":   allowConfigSchema(),
									"block":   blockConfigSchema(),
									"captcha": captchaConfigSchema(),
									"count":   countConfigSchema(),
								},
							},
						},
						"name": {
							Type:         schema.TypeString,
							Required:     true,
							ValidateFunc: validation.StringLenBetween(1, 128),
						},
						"override_action": {
							Type:     schema.TypeList,
							Optional: true,
							MaxItems: 1,
							Elem: &schema.Resource{
								Schema: map[string]*schema.Schema{
									"count": emptySchema(),
									"none":  emptySchema(),
								},
							},
						},
						"priority": {
							Type:     schema.TypeInt,
							Required: true,
						},
						"rule_label":        ruleLabelsSchema(),
						"statement":         webACLRootStatementSchema(webACLRootStatementSchemaLevel),
						"visibility_config": visibilityConfigSchema(),
					},
				},
			},
			"scope": {
				Type:         schema.TypeString,
				Required:     true,
				ForceNew:     true,
				ValidateFunc: validation.StringInSlice(wafv2.Scope_Values(), false),
			},
			"tags":              tftags.TagsSchema(),
			"tags_all":          tftags.TagsSchemaComputed(),
			"visibility_config": visibilityConfigSchema(),
		},

		CustomizeDiff: verify.SetTagsDiff,
	}
}

func resourceWebACLCreate(ctx context.Context, d *schema.ResourceData, meta interface{}) diag.Diagnostics {
	conn := meta.(*conns.AWSClient).WAFV2Conn
	defaultTagsConfig := meta.(*conns.AWSClient).DefaultTagsConfig
	tags := defaultTagsConfig.MergeTags(tftags.New(d.Get("tags").(map[string]interface{})))

	name := d.Get("name").(string)
	input := &wafv2.CreateWebACLInput{
		DefaultAction:    expandDefaultAction(d.Get("default_action").([]interface{})),
		Name:             aws.String(name),
		Rules:            expandWebACLRules(d.Get("rule").(*schema.Set).List()),
		Scope:            aws.String(d.Get("scope").(string)),
		VisibilityConfig: expandVisibilityConfig(d.Get("visibility_config").([]interface{})),
	}

	if v, ok := d.GetOk("custom_response_body"); ok && v.(*schema.Set).Len() > 0 {
		input.CustomResponseBodies = expandCustomResponseBodies(v.(*schema.Set).List())
	}

	if v, ok := d.GetOk("description"); ok {
		input.Description = aws.String(v.(string))
	}

	if len(tags) > 0 {
		input.Tags = Tags(tags.IgnoreAWS())
	}

	log.Printf("[INFO] Creating WAFv2 WebACL: %s", input)
	outputRaw, err := tfresource.RetryWhenAWSErrCodeEqualsContext(ctx, webACLCreateTimeout, func() (interface{}, error) {
		return conn.CreateWebACLWithContext(ctx, input)
	}, wafv2.ErrCodeWAFUnavailableEntityException)

	if err != nil {
		return diag.Errorf("creating WAFv2 WebACL (%s): %s", name, err)
	}

	output := outputRaw.(*wafv2.CreateWebACLOutput)

	d.SetId(aws.StringValue(output.Summary.Id))

	return resourceWebACLRead(ctx, d, meta)
}

func resourceWebACLRead(ctx context.Context, d *schema.ResourceData, meta interface{}) diag.Diagnostics {
	conn := meta.(*conns.AWSClient).WAFV2Conn
	defaultTagsConfig := meta.(*conns.AWSClient).DefaultTagsConfig
	ignoreTagsConfig := meta.(*conns.AWSClient).IgnoreTagsConfig

	output, err := FindWebACLByThreePartKey(ctx, conn, d.Id(), d.Get("name").(string), d.Get("scope").(string))

	if !d.IsNewResource() && tfresource.NotFound(err) {
		log.Printf("[WARN] WAFv2 WebACL (%s) not found, removing from state", d.Id())
		d.SetId("")
		return nil
	}

	if err != nil {
		return diag.Errorf("reading WAFv2 WebACL (%s): %s", d.Id(), err)
	}

	webACL := output.WebACL
	arn := aws.StringValue(webACL.ARN)
	d.Set("arn", arn)
	d.Set("capacity", webACL.Capacity)
	if err := d.Set("custom_response_body", flattenCustomResponseBodies(webACL.CustomResponseBodies)); err != nil {
		return diag.Errorf("setting custom_response_body: %s", err)
	}
	if err := d.Set("default_action", flattenDefaultAction(webACL.DefaultAction)); err != nil {
		return diag.Errorf("setting default_action: %s", err)
	}
	d.Set("description", webACL.Description)
	d.Set("lock_token", output.LockToken)
	d.Set("name", webACL.Name)
	if err := d.Set("rule", flattenWebACLRules(webACL.Rules)); err != nil {
		return diag.Errorf("setting rule: %s", err)
	}
	if err := d.Set("visibility_config", flattenVisibilityConfig(webACL.VisibilityConfig)); err != nil {
		return diag.Errorf("setting visibility_config: %s", err)
	}

	tags, err := ListTagsWithContext(ctx, conn, arn)

	if err != nil {
		return diag.Errorf("listing tags for WAFv2 WebACL (%s): %s", arn, err)
	}

	tags = tags.IgnoreAWS().IgnoreConfig(ignoreTagsConfig)

	//lintignore:AWSR002
	if err := d.Set("tags", tags.RemoveDefaultConfig(defaultTagsConfig).Map()); err != nil {
		return diag.Errorf("setting tags: %s", err)
	}

	if err := d.Set("tags_all", tags.Map()); err != nil {
		return diag.Errorf("setting tags_all: %s", err)
	}

	return nil
}

func resourceWebACLUpdate(ctx context.Context, d *schema.ResourceData, meta interface{}) diag.Diagnostics {
	conn := meta.(*conns.AWSClient).WAFV2Conn

	if d.HasChangesExcept("tags", "tags_all") {
		input := &wafv2.UpdateWebACLInput{
			DefaultAction:    expandDefaultAction(d.Get("default_action").([]interface{})),
			Id:               aws.String(d.Id()),
			LockToken:        aws.String(d.Get("lock_token").(string)),
			Name:             aws.String(d.Get("name").(string)),
			Rules:            expandWebACLRules(d.Get("rule").(*schema.Set).List()),
			Scope:            aws.String(d.Get("scope").(string)),
			VisibilityConfig: expandVisibilityConfig(d.Get("visibility_config").([]interface{})),
		}

		if v, ok := d.GetOk("custom_response_body"); ok && v.(*schema.Set).Len() > 0 {
			input.CustomResponseBodies = expandCustomResponseBodies(v.(*schema.Set).List())
		}

		if v, ok := d.GetOk("description"); ok {
			input.Description = aws.String(v.(string))
		}

		log.Printf("[INFO] Updating WAFv2 WebACL: %s", input)
		_, err := tfresource.RetryWhenAWSErrCodeEqualsContext(ctx, webACLUpdateTimeout, func() (interface{}, error) {
			return conn.UpdateWebACLWithContext(ctx, input)
		}, wafv2.ErrCodeWAFUnavailableEntityException)

		if tfawserr.ErrCodeEquals(err, wafv2.ErrCodeWAFOptimisticLockException) {
			return diag.Errorf("updating WAFv2 WebACL (%s), resource has changed since last refresh please run a new plan before applying again: %s", d.Id(), err)
		}

		if err != nil {
			return diag.Errorf("updating WAFv2 WebACL (%s): %s", d.Id(), err)
		}
	}

	if d.HasChange("tags_all") {
		o, n := d.GetChange("tags_all")
		arn := d.Get("arn").(string)

		if err := UpdateTagsWithContext(ctx, conn, arn, o, n); err != nil {
			return diag.Errorf("updating tags for WAFv2 WebACL (%s): %s", arn, err)
		}
	}

	return resourceWebACLRead(ctx, d, meta)
}

func resourceWebACLDelete(ctx context.Context, d *schema.ResourceData, meta interface{}) diag.Diagnostics {
	conn := meta.(*conns.AWSClient).WAFV2Conn

	input := &wafv2.DeleteWebACLInput{
		Id:        aws.String(d.Id()),
		LockToken: aws.String(d.Get("lock_token").(string)),
		Name:      aws.String(d.Get("name").(string)),
		Scope:     aws.String(d.Get("scope").(string)),
	}

	log.Printf("[INFO] Deleting WAFv2 WebACL: %s", d.Id())
	_, err := tfresource.RetryWhenAWSErrCodeEqualsContext(ctx, webACLDeleteTimeout, func() (interface{}, error) {
		return conn.DeleteWebACLWithContext(ctx, input)
	}, wafv2.ErrCodeWAFAssociatedItemException, wafv2.ErrCodeWAFUnavailableEntityException)

	if tfawserr.ErrCodeEquals(err, wafv2.ErrCodeWAFNonexistentItemException) {
		return nil
	}

	if err != nil {
		return diag.Errorf("deleting WAFv2 WebACL (%s): %s", d.Id(), err)
	}

	return nil
}

func FindWebACLByThreePartKey(ctx context.Context, conn *wafv2.WAFV2, id, name, scope string) (*wafv2.GetWebACLOutput, error) {
	input := &wafv2.GetWebACLInput{
		Id:    aws.String(id),
		Name:  aws.String(name),
		Scope: aws.String(scope),
	}

	output, err := conn.GetWebACLWithContext(ctx, input)

	if tfawserr.ErrCodeEquals(err, wafv2.ErrCodeWAFNonexistentItemException) {
		return nil, &resource.NotFoundError{
			LastError:   err,
			LastRequest: input,
		}
	}

	if err != nil {
		return nil, err
	}

	if output == nil || output.WebACL == nil {
		return nil, tfresource.NewEmptyResultError(input)
	}

	return output, nil
}
