// Copyright (c) EZSCALE.
// SPDX-License-Identifier: MPL-2.0

package provider

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"

	"terraform-provider-virtfusion/internal/client"

	"github.com/hashicorp/terraform-plugin-framework/resource"
	"github.com/hashicorp/terraform-plugin-framework/resource/schema"
	"github.com/hashicorp/terraform-plugin-framework/resource/schema/int64planmodifier"
	"github.com/hashicorp/terraform-plugin-framework/resource/schema/planmodifier"
	"github.com/hashicorp/terraform-plugin-framework/types"
)

// Ensure provider-defined types fully satisfy framework interfaces.
var (
	_ resource.Resource              = &SelfServiceResourcePackResource{}
	_ resource.ResourceWithConfigure = &SelfServiceResourcePackResource{}
)

// NewSelfServiceResourcePackResource creates a new self-service resource pack resource.
func NewSelfServiceResourcePackResource() resource.Resource {
	return &SelfServiceResourcePackResource{}
}

// SelfServiceResourcePackResource defines the resource implementation.
type SelfServiceResourcePackResource struct {
	client *client.Client
}

// SelfServiceResourcePackResourceModel describes the resource data model.
type SelfServiceResourcePackResourceModel struct {
	ID     types.Int64  `tfsdk:"id"`
	Name   types.String `tfsdk:"name"`
	UserID types.Int64  `tfsdk:"user_id"`
	PackID types.Int64  `tfsdk:"pack_id"`
}

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

func (r *SelfServiceResourcePackResource) Schema(_ context.Context, _ resource.SchemaRequest, resp *resource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "Manages a self-service resource pack in VirtFusion.",
		Attributes: map[string]schema.Attribute{
			"id": schema.Int64Attribute{
				MarkdownDescription: "The identifier of the resource pack.",
				Computed:            true,
				PlanModifiers: []planmodifier.Int64{
					int64planmodifier.UseStateForUnknown(),
				},
			},
			"name": schema.StringAttribute{
				MarkdownDescription: "The name of the resource pack.",
				Required:            true,
			},
			"user_id": schema.Int64Attribute{
				MarkdownDescription: "The ID of the user who owns the resource pack.",
				Required:            true,
			},
			"pack_id": schema.Int64Attribute{
				MarkdownDescription: "The ID of the pack.",
				Required:            true,
			},
		},
	}
}

func (r *SelfServiceResourcePackResource) 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(
			"Unexpected Resource Configure Type",
			fmt.Sprintf("Expected *client.Client, got: %T. Please report this issue to the provider developers.", req.ProviderData),
		)
		return
	}

	r.client = c
}

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

	packReq := client.SelfServiceResourcePackRequest{
		Name:   data.Name.ValueString(),
		UserID: data.UserID.ValueInt64(),
		PackID: data.PackID.ValueInt64(),
	}

	respBody, err := r.client.Post(ctx, "/selfService/resourcePack", packReq)
	if err != nil {
		resp.Diagnostics.AddError(
			"Error Creating Resource Pack",
			fmt.Sprintf("Could not create resource pack: %s", err),
		)
		return
	}

	var packResp client.SelfServiceResourcePackResponse
	if err := json.Unmarshal(respBody, &packResp); err != nil {
		resp.Diagnostics.AddError(
			"Error Parsing Response",
			fmt.Sprintf("Could not parse resource pack response: %s", err),
		)
		return
	}

	data.ID = types.Int64Value(packResp.Data.ID)

	resp.Diagnostics.Append(resp.State.Set(ctx, &data)...)
}

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

	apiPath := fmt.Sprintf("/selfService/resourcePack/%d", data.ID.ValueInt64())
	respBody, err := r.client.Get(ctx, apiPath)
	if err != nil {
		var apiErr *client.APIError
		if errors.As(err, &apiErr) && apiErr.IsNotFound() {
			// Resource no longer exists, remove from state.
			resp.State.RemoveResource(ctx)
			return
		}

		resp.Diagnostics.AddError(
			"Error Reading Resource Pack",
			fmt.Sprintf("Could not read resource pack %d: %s", data.ID.ValueInt64(), err),
		)
		return
	}

	var packResp client.SelfServiceResourcePackResponse
	if err := json.Unmarshal(respBody, &packResp); err != nil {
		resp.Diagnostics.AddError(
			"Error Parsing Response",
			fmt.Sprintf("Could not parse resource pack response: %s", err),
		)
		return
	}

	data.Name = types.StringValue(packResp.Data.Name)
	data.UserID = types.Int64Value(packResp.Data.UserID)
	data.PackID = types.Int64Value(packResp.Data.PackID)

	resp.Diagnostics.Append(resp.State.Set(ctx, &data)...)
}

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

	packReq := client.SelfServiceResourcePackRequest{
		Name:   data.Name.ValueString(),
		UserID: data.UserID.ValueInt64(),
		PackID: data.PackID.ValueInt64(),
	}

	apiPath := fmt.Sprintf("/selfService/resourcePack/%d", data.ID.ValueInt64())
	_, err := r.client.Put(ctx, apiPath, packReq)
	if err != nil {
		resp.Diagnostics.AddError(
			"Error Updating Resource Pack",
			fmt.Sprintf("Could not update resource pack %d: %s", data.ID.ValueInt64(), err),
		)
		return
	}

	resp.Diagnostics.Append(resp.State.Set(ctx, &data)...)
}

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

	apiPath := fmt.Sprintf("/selfService/resourcePack/%d", data.ID.ValueInt64())
	_, err := r.client.Delete(ctx, apiPath)
	if err != nil {
		var apiErr *client.APIError
		if errors.As(err, &apiErr) && apiErr.IsNotFound() {
			return
		}
		resp.Diagnostics.AddError(
			"Error Deleting Resource Pack",
			fmt.Sprintf("Could not delete resource pack %d: %s", data.ID.ValueInt64(), err),
		)
		return
	}
}