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

package provider

import (
	"context"
	"fmt"
	"time"

	"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/mapplanmodifier"
	"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              = &SelfServicePackServersActionResource{}
	_ resource.ResourceWithConfigure = &SelfServicePackServersActionResource{}
)

// NewSelfServicePackServersActionResource creates a new self-service pack servers action resource.
func NewSelfServicePackServersActionResource() resource.Resource {
	return &SelfServicePackServersActionResource{}
}

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

// SelfServicePackServersActionResourceModel describes the resource data model.
type SelfServicePackServersActionResourceModel struct {
	ID       types.String `tfsdk:"id"`
	PackID   types.Int64  `tfsdk:"pack_id"`
	Action   types.String `tfsdk:"action"`
	Triggers types.Map    `tfsdk:"triggers"`
}

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

func (r *SelfServicePackServersActionResource) Schema(_ context.Context, _ resource.SchemaRequest, resp *resource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "Performs an action on all servers in a self-service resource pack. This is a trigger-style resource — the action is executed on create and can be re-triggered by changing the `triggers` attribute.",
		Attributes: map[string]schema.Attribute{
			"id": schema.StringAttribute{
				MarkdownDescription: "The identifier for this pack servers action.",
				Computed:            true,
				PlanModifiers: []planmodifier.String{
					stringplanmodifier.UseStateForUnknown(),
				},
			},
			"pack_id": schema.Int64Attribute{
				MarkdownDescription: "The ID of the resource pack.",
				Required:            true,
			},
			"action": schema.StringAttribute{
				MarkdownDescription: "The action to perform on the pack servers. Must be one of: `suspend`, `unsuspend`, `delete`.",
				Required:            true,
			},
			"triggers": schema.MapAttribute{
				MarkdownDescription: "A map of arbitrary strings that, when changed, will cause the action to be re-executed. Works like `triggers` in `terraform_data`.",
				ElementType:         types.StringType,
				Optional:            true,
				PlanModifiers: []planmodifier.Map{
					mapplanmodifier.RequiresReplace(),
				},
			},
		},
	}
}

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

	action := data.Action.ValueString()
	packID := data.PackID.ValueInt64()

	switch action {
	case "suspend":
		apiPath := fmt.Sprintf("/selfService/resourcePack/%d/servers/suspend", packID)
		_, err := r.client.Post(ctx, apiPath, nil)
		if err != nil {
			resp.Diagnostics.AddError(
				"Error Suspending Pack Servers",
				fmt.Sprintf("Could not suspend servers for resource pack %d: %s", packID, err),
			)
			return
		}
	case "unsuspend":
		apiPath := fmt.Sprintf("/selfService/resourcePack/%d/servers/unsuspend", packID)
		_, err := r.client.Post(ctx, apiPath, nil)
		if err != nil {
			resp.Diagnostics.AddError(
				"Error Unsuspending Pack Servers",
				fmt.Sprintf("Could not unsuspend servers for resource pack %d: %s", packID, err),
			)
			return
		}
	case "delete":
		apiPath := fmt.Sprintf("/selfService/resourcePack/%d/servers", packID)
		_, err := r.client.Delete(ctx, apiPath)
		if err != nil {
			resp.Diagnostics.AddError(
				"Error Deleting Pack Servers",
				fmt.Sprintf("Could not delete servers for resource pack %d: %s", packID, err),
			)
			return
		}
	}

	data.ID = types.StringValue(fmt.Sprintf("%d-%s-%d", packID, action, time.Now().UnixNano()))

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

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

	// Return stored state as-is for trigger-style resources.
	resp.Diagnostics.Append(resp.State.Set(ctx, &data)...)
}

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

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

func (r *SelfServicePackServersActionResource) Delete(_ context.Context, _ resource.DeleteRequest, _ *resource.DeleteResponse) {
	// No-op: pack server actions are not reversible. Removing from state only.
}

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

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

	// Validate action is one of the allowed values.
	if !data.Action.IsNull() && !data.Action.IsUnknown() {
		action := data.Action.ValueString()
		validActions := map[string]bool{
			"suspend":   true,
			"unsuspend": true,
			"delete":    true,
		}
		if !validActions[action] {
			resp.Diagnostics.AddAttributeError(
				path.Root("action"),
				"Invalid Pack Servers Action",
				fmt.Sprintf("action must be one of: suspend, unsuspend, delete. Got: %q", action),
			)
		}
	}
}