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

package provider

import (
	"context"
	"fmt"

	"terraform-provider-virtfusion/internal/client"

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

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

// NewSelfServiceHourlyResourcePackResource creates a new self-service hourly resource pack resource.
func NewSelfServiceHourlyResourcePackResource() resource.Resource {
	return &SelfServiceHourlyResourcePackResource{}
}

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

// SelfServiceHourlyResourcePackResourceModel describes the resource data model.
type SelfServiceHourlyResourcePackResourceModel struct {
	ID             types.String `tfsdk:"id"`
	UserID         types.Int64  `tfsdk:"user_id"`
	GroupID        types.Int64  `tfsdk:"group_id"`
	ResourcePackID types.Int64  `tfsdk:"resource_pack_id"`
}

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

func (r *SelfServiceHourlyResourcePackResource) Schema(_ context.Context, _ resource.SchemaRequest, resp *resource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "Sets the hourly resource pack for a user and group in VirtFusion self-service. Changing any attribute forces recreation.",
		Attributes: map[string]schema.Attribute{
			"id": schema.StringAttribute{
				MarkdownDescription: "The composite identifier for this hourly resource pack assignment.",
				Computed:            true,
				PlanModifiers: []planmodifier.String{
					stringplanmodifier.UseStateForUnknown(),
				},
			},
			"user_id": schema.Int64Attribute{
				MarkdownDescription: "The ID of the user.",
				Required:            true,
				PlanModifiers: []planmodifier.Int64{
					int64planmodifier.RequiresReplace(),
				},
			},
			"group_id": schema.Int64Attribute{
				MarkdownDescription: "The ID of the group.",
				Required:            true,
				PlanModifiers: []planmodifier.Int64{
					int64planmodifier.RequiresReplace(),
				},
			},
			"resource_pack_id": schema.Int64Attribute{
				MarkdownDescription: "The ID of the resource pack.",
				Required:            true,
				PlanModifiers: []planmodifier.Int64{
					int64planmodifier.RequiresReplace(),
				},
			},
		},
	}
}

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

	apiPath := fmt.Sprintf("/selfService/hourlyResourcePack/byUser/%d/group/%d/resourcePack/%d",
		data.UserID.ValueInt64(), data.GroupID.ValueInt64(), data.ResourcePackID.ValueInt64())
	_, err := r.client.Put(ctx, apiPath, nil)
	if err != nil {
		resp.Diagnostics.AddError(
			"Error Setting Hourly Resource Pack",
			fmt.Sprintf("Could not set hourly resource pack (user=%d, group=%d, resource_pack=%d): %s",
				data.UserID.ValueInt64(), data.GroupID.ValueInt64(), data.ResourcePackID.ValueInt64(), err),
		)
		return
	}

	data.ID = types.StringValue(fmt.Sprintf("%d-%d-%d", data.UserID.ValueInt64(), data.GroupID.ValueInt64(), data.ResourcePackID.ValueInt64()))

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

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

	// Return stored state as-is. The API does not provide a direct read endpoint for this assignment.
	resp.Diagnostics.Append(resp.State.Set(ctx, &data)...)
}

func (r *SelfServiceHourlyResourcePackResource) Update(ctx context.Context, req resource.UpdateRequest, resp *resource.UpdateResponse) {
	// All attributes have RequiresReplace, so Update should never be called.
	var data SelfServiceHourlyResourcePackResourceModel
	resp.Diagnostics.Append(req.Plan.Get(ctx, &data)...)
	if resp.Diagnostics.HasError() {
		return
	}

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

func (r *SelfServiceHourlyResourcePackResource) Delete(_ context.Context, _ resource.DeleteRequest, _ *resource.DeleteResponse) {
	// No-op: removing the hourly resource pack assignment from state only.
}

// ValidateConfig validates the resource configuration.
func (r *SelfServiceHourlyResourcePackResource) ValidateConfig(ctx context.Context, req resource.ValidateConfigRequest, resp *resource.ValidateConfigResponse) {
	var data SelfServiceHourlyResourcePackResourceModel
	resp.Diagnostics.Append(req.Config.Get(ctx, &data)...)
	if resp.Diagnostics.HasError() {
		return
	}

	// Validate user_id is positive.
	if !data.UserID.IsNull() && !data.UserID.IsUnknown() && data.UserID.ValueInt64() <= 0 {
		resp.Diagnostics.AddAttributeError(
			path.Root("user_id"),
			"Invalid User ID",
			"user_id must be a positive integer.",
		)
	}

	// Validate group_id is positive.
	if !data.GroupID.IsNull() && !data.GroupID.IsUnknown() && data.GroupID.ValueInt64() <= 0 {
		resp.Diagnostics.AddAttributeError(
			path.Root("group_id"),
			"Invalid Group ID",
			"group_id must be a positive integer.",
		)
	}

	// Validate resource_pack_id is positive.
	if !data.ResourcePackID.IsNull() && !data.ResourcePackID.IsUnknown() && data.ResourcePackID.ValueInt64() <= 0 {
		resp.Diagnostics.AddAttributeError(
			path.Root("resource_pack_id"),
			"Invalid Resource Pack ID",
			"resource_pack_id must be a positive integer.",
		)
	}
}