package resources

import (
	"context"
	"fmt"

	"github.com/hashicorp/terraform-plugin-framework/resource"
	"github.com/hashicorp/terraform-plugin-framework/resource/schema"
	"github.com/hashicorp/terraform-plugin-framework/resource/schema/planmodifier"
	"github.com/hashicorp/terraform-plugin-framework/resource/schema/stringdefault"
	"github.com/hashicorp/terraform-plugin-framework/resource/schema/stringplanmodifier"
	"github.com/hashicorp/terraform-plugin-framework/types"

	"terraform-provider-fission/internal/client"
)

var _ resource.Resource = &MQTriggerResource{}

// MQTriggerResource управляет MQ-триггером через K8s Deployment+Secret (sqs-consumer).
type MQTriggerResource struct {
	client *client.Client
}

type mqTriggerResourceModel struct {
	ID          types.String `tfsdk:"id"`
	Name        types.String `tfsdk:"name"`
	Namespace   types.String `tfsdk:"namespace"`
	Function    types.String `tfsdk:"function"`
	Queue       types.String `tfsdk:"queue"`
	AccessKey   types.String `tfsdk:"access_key"`
	SecretKey   types.String `tfsdk:"secret_key"`
	SQSEndpoint types.String `tfsdk:"sqs_endpoint"`
}

func NewMQTriggerResource() resource.Resource {
	return &MQTriggerResource{}
}

func (r *MQTriggerResource) Metadata(_ context.Context, req resource.MetadataRequest, resp *resource.MetadataResponse) {
	resp.TypeName = req.ProviderTypeName + "_mq_trigger"
}

func (r *MQTriggerResource) Schema(_ context.Context, _ resource.SchemaRequest, resp *resource.SchemaResponse) {
	resp.Schema = schema.Schema{
		Description: "MQ-триггер через K8s Deployment (sqs-consumer) + Secret с SQS credentials.",
		Attributes: map[string]schema.Attribute{
			"id": schema.StringAttribute{
				Computed:    true,
				Description: "Идентификатор ресурса (namespace/name).",
			},
			"name": schema.StringAttribute{
				Required:    true,
				Description: "Имя MQ trigger.",
				PlanModifiers: []planmodifier.String{
					stringplanmodifier.RequiresReplace(),
				},
			},
			"namespace": schema.StringAttribute{
				Optional:    true,
				Computed:    true,
				Description: "Kubernetes namespace.",
				PlanModifiers: []planmodifier.String{
					stringplanmodifier.RequiresReplace(),
				},
			},
			"function": schema.StringAttribute{
				Required:    true,
				Description: "Имя Fission Function, к которой направляются сообщения из очереди.",
			},
			"queue": schema.StringAttribute{
				Required:    true,
				Description: "Имя SQS очереди.",
			},
			"access_key": schema.StringAttribute{
				Required:    true,
				Sensitive:   true,
				Description: "SQS Access Key.",
			},
			"secret_key": schema.StringAttribute{
				Required:    true,
				Sensitive:   true,
				Description: "SQS Secret Key.",
			},
			"sqs_endpoint": schema.StringAttribute{
				Optional:    true,
				Computed:    true,
				Default:     stringdefault.StaticString("http://shared-sqs.shared-sqs.svc.cluster.local:4100"),
				Description: "SQS endpoint URL. По умолчанию — внутренний shared-sqs.",
			},
		},
	}
}

func (r *MQTriggerResource) Configure(_ context.Context, req resource.ConfigureRequest, resp *resource.ConfigureResponse) {
	if req.ProviderData == nil {
		return
	}
	c, ok := req.ProviderData.(*client.Client)
	if !ok {
		resp.Diagnostics.AddError("Неверный тип провайдера", fmt.Sprintf("ожидался *client.Client, получен %T", req.ProviderData))
		return
	}
	r.client = c
}

func (r *MQTriggerResource) Create(ctx context.Context, req resource.CreateRequest, resp *resource.CreateResponse) {
	var plan mqTriggerResourceModel
	resp.Diagnostics.Append(req.Plan.Get(ctx, &plan)...)
	if resp.Diagnostics.HasError() {
		return
	}

	ns := plan.Namespace.ValueString()
	if ns == "" {
		ns = r.client.Namespace
	}

	info, err := r.client.CreateMQTrigger(
		ctx,
		plan.Name.ValueString(),
		ns,
		plan.Function.ValueString(),
		plan.Queue.ValueString(),
		plan.SQSEndpoint.ValueString(),
		plan.AccessKey.ValueString(),
		plan.SecretKey.ValueString(),
	)
	if err != nil {
		resp.Diagnostics.AddError("Ошибка создания MQ trigger", err.Error())
		return
	}

	plan.ID = types.StringValue(ns + "/" + plan.Name.ValueString())
	plan.Namespace = types.StringValue(ns)
	plan.SQSEndpoint = types.StringValue(info.SQSEndpoint)
	resp.Diagnostics.Append(resp.State.Set(ctx, &plan)...)
}

func (r *MQTriggerResource) Read(ctx context.Context, req resource.ReadRequest, resp *resource.ReadResponse) {
	var state mqTriggerResourceModel
	resp.Diagnostics.Append(req.State.Get(ctx, &state)...)
	if resp.Diagnostics.HasError() {
		return
	}

	ns := state.Namespace.ValueString()
	info, err := r.client.GetMQTrigger(ctx, ns, state.Name.ValueString())
	if err != nil {
		if client.IsNotFound(err) {
			resp.State.RemoveResource(ctx)
			return
		}
		resp.Diagnostics.AddError("Ошибка чтения MQ trigger", err.Error())
		return
	}

	state.Function = types.StringValue(info.Function)
	state.Queue = types.StringValue(info.Queue)
	state.SQSEndpoint = types.StringValue(info.SQSEndpoint)
	resp.Diagnostics.Append(resp.State.Set(ctx, &state)...)
}

func (r *MQTriggerResource) Update(ctx context.Context, req resource.UpdateRequest, resp *resource.UpdateResponse) {
	var plan mqTriggerResourceModel
	resp.Diagnostics.Append(req.Plan.Get(ctx, &plan)...)
	if resp.Diagnostics.HasError() {
		return
	}

	ns := plan.Namespace.ValueString()
	name := plan.Name.ValueString()

	// Удаляем старый и создаём заново с новыми параметрами.
	if err := r.client.DeleteMQTrigger(ctx, ns, name); err != nil {
		resp.Diagnostics.AddError("Ошибка удаления MQ trigger при обновлении", err.Error())
		return
	}
	info, err := r.client.CreateMQTrigger(
		ctx, name, ns,
		plan.Function.ValueString(),
		plan.Queue.ValueString(),
		plan.SQSEndpoint.ValueString(),
		plan.AccessKey.ValueString(),
		plan.SecretKey.ValueString(),
	)
	if err != nil {
		resp.Diagnostics.AddError("Ошибка создания MQ trigger при обновлении", err.Error())
		return
	}

	plan.SQSEndpoint = types.StringValue(info.SQSEndpoint)
	resp.Diagnostics.Append(resp.State.Set(ctx, &plan)...)
}

func (r *MQTriggerResource) Delete(ctx context.Context, req resource.DeleteRequest, resp *resource.DeleteResponse) {
	var state mqTriggerResourceModel
	resp.Diagnostics.Append(req.State.Get(ctx, &state)...)
	if resp.Diagnostics.HasError() {
		return
	}

	if err := r.client.DeleteMQTrigger(ctx, state.Namespace.ValueString(), state.Name.ValueString()); err != nil {
		resp.Diagnostics.AddError("Ошибка удаления MQ trigger", err.Error())
	}
}