package provider

import (
	"context"
	"fmt"

	"github.com/hashicorp/terraform-plugin-framework-validators/stringvalidator"
	"github.com/hashicorp/terraform-plugin-framework/path"
	"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/stringplanmodifier"
	"github.com/hashicorp/terraform-plugin-framework/schema/validator"
	"github.com/hashicorp/terraform-plugin-framework/types"
	"github.com/hashicorp/terraform-plugin-log/tflog"
	"github.com/netascode/go-sdwan"
	"github.com/netascode/terraform-provider-sdwan/internal/provider/helpers"
)

// Ensure provider defined types fully satisfy framework interfaces
var _ resource.Resource = &CLIDeviceTemplateResource{}
var _ resource.ResourceWithImportState = &CLIDeviceTemplateResource{}

func NewCLIDeviceTemplateResource() resource.Resource {
	return &CLIDeviceTemplateResource{}
}

type CLIDeviceTemplateResource struct {
	client *sdwan.Client
}

func (r *CLIDeviceTemplateResource) Metadata(ctx context.Context, req resource.MetadataRequest, resp *resource.MetadataResponse) {
	resp.TypeName = req.ProviderTypeName + "_cli_device_template"
}

func (r *CLIDeviceTemplateResource) Schema(ctx context.Context, req resource.SchemaRequest, resp *resource.SchemaResponse) {
	resp.Schema = schema.Schema{
		// This description is used by the documentation generator and the language server.
		MarkdownDescription: helpers.NewAttributeDescription("This resource can manage a CLI device template.").String,

		Attributes: map[string]schema.Attribute{
			"id": schema.StringAttribute{
				MarkdownDescription: "The id of the device template",
				Computed:            true,
				PlanModifiers: []planmodifier.String{
					stringplanmodifier.UseStateForUnknown(),
				},
			},
			"name": schema.StringAttribute{
				MarkdownDescription: "The name of the device template",
				Required:            true,
			},
			"description": schema.StringAttribute{
				MarkdownDescription: "The description of the device template",
				Required:            true,
			},
			"device_type": schema.StringAttribute{
				MarkdownDescription: "The device type (e.g., `vedge-ISR-4331`)",
				Required:            true,
			},
			"cli_type": schema.StringAttribute{
				MarkdownDescription: helpers.NewAttributeDescription("CLI type").AddStringEnumDescription("device", "intend").String,
				Required:            true,
				Validators: []validator.String{
					stringvalidator.OneOf("device", "intend"),
				},
			},
			"cli_configuration": schema.StringAttribute{
				MarkdownDescription: helpers.NewAttributeDescription("CLI configuration").String,
				Required:            true,
			},
		},
	}
}

func (r *CLIDeviceTemplateResource) Configure(_ context.Context, req resource.ConfigureRequest, _ *resource.ConfigureResponse) {
	if req.ProviderData == nil {
		return
	}

	r.client = req.ProviderData.(*SdwanProviderData).Client
}

func (r *CLIDeviceTemplateResource) Create(ctx context.Context, req resource.CreateRequest, resp *resource.CreateResponse) {
	var plan CLIDeviceTemplate

	// Read plan
	diags := req.Plan.Get(ctx, &plan)
	resp.Diagnostics.Append(diags...)
	if resp.Diagnostics.HasError() {
		return
	}

	tflog.Debug(ctx, fmt.Sprintf("%s: Beginning Create", plan.Name.ValueString()))

	// Create object
	body := plan.toBody(ctx)

	res, err := r.client.Post("/template/device/cli", body)
	if err != nil {
		resp.Diagnostics.AddError("Client Error", fmt.Sprintf("Failed to configure object (POST), got error: %s, %s", err, res.String()))
		return
	}

	plan.Id = types.StringValue(res.Get("templateId").String())

	tflog.Debug(ctx, fmt.Sprintf("%s: Create finished successfully", plan.Name.ValueString()))

	diags = resp.State.Set(ctx, &plan)
	resp.Diagnostics.Append(diags...)
}

func (r *CLIDeviceTemplateResource) Read(ctx context.Context, req resource.ReadRequest, resp *resource.ReadResponse) {
	var state CLIDeviceTemplate

	// Read state
	diags := req.State.Get(ctx, &state)
	resp.Diagnostics.Append(diags...)
	if resp.Diagnostics.HasError() {
		return
	}

	tflog.Debug(ctx, fmt.Sprintf("%s: Beginning Read", state.Name.String()))

	res, err := r.client.Get("/template/device/object/" + state.Id.ValueString())
	if res.Get("error.message").String() == "Invalid Template Id" {
		resp.State.RemoveResource(ctx)
		return
	} else if err != nil {
		resp.Diagnostics.AddError("Client Error", fmt.Sprintf("Failed to retrieve object (GET), got error: %s, %s", err, res.String()))
		return
	}

	state.fromBody(ctx, res)

	tflog.Debug(ctx, fmt.Sprintf("%s: Read finished successfully", state.Name.ValueString()))

	diags = resp.State.Set(ctx, &state)
	resp.Diagnostics.Append(diags...)
}

func (r *CLIDeviceTemplateResource) Update(ctx context.Context, req resource.UpdateRequest, resp *resource.UpdateResponse) {
	var plan CLIDeviceTemplate

	// Read plan
	diags := req.Plan.Get(ctx, &plan)
	resp.Diagnostics.Append(diags...)
	if resp.Diagnostics.HasError() {
		return
	}

	tflog.Debug(ctx, fmt.Sprintf("%s: Beginning Update", plan.Name.ValueString()))

	body := plan.toBody(ctx)
	res, err := r.client.Put("/template/device/"+plan.Id.ValueString(), body)
	if err != nil {
		resp.Diagnostics.AddError("Client Error", fmt.Sprintf("Failed to configure object (PUT), got error: %s, %s", err, res.String()))
		return
	}

	tflog.Debug(ctx, fmt.Sprintf("%s: Update finished successfully", plan.Name.ValueString()))

	diags = resp.State.Set(ctx, &plan)
	resp.Diagnostics.Append(diags...)
}

func (r *CLIDeviceTemplateResource) Delete(ctx context.Context, req resource.DeleteRequest, resp *resource.DeleteResponse) {
	var state CLIDeviceTemplate

	// Read state
	diags := req.State.Get(ctx, &state)
	resp.Diagnostics.Append(diags...)
	if resp.Diagnostics.HasError() {
		return
	}

	tflog.Debug(ctx, fmt.Sprintf("%s: Beginning Delete", state.Name.ValueString()))

	res, err := r.client.Delete("/template/device/" + state.Id.ValueString())
	if err != nil && res.Get("error.message").String() != "Invalid Template Id" {
		resp.Diagnostics.AddError("Client Error", fmt.Sprintf("Failed to delete object (DELETE), got error: %s, %s", err, res.String()))
		return
	}

	tflog.Debug(ctx, fmt.Sprintf("%s: Delete finished successfully", state.Name.ValueString()))

	resp.State.RemoveResource(ctx)
}

func (r *CLIDeviceTemplateResource) ImportState(ctx context.Context, req resource.ImportStateRequest, resp *resource.ImportStateResponse) {
	resource.ImportStatePassthroughID(ctx, path.Root("id"), req, resp)
}
