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

package provider

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

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

var (
	_ resource.Resource                = &UserResource{}
	_ resource.ResourceWithConfigure   = &UserResource{}
	_ resource.ResourceWithImportState = &UserResource{}
)

// NewUserResource returns a new resource for managing VirtFusion users.
func NewUserResource() resource.Resource {
	return &UserResource{}
}

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

// UserResourceModel describes the resource data model.
type UserResourceModel struct {
	ID            types.Int64  `tfsdk:"id"`
	Name          types.String `tfsdk:"name"`
	Email         types.String `tfsdk:"email"`
	ExtRelationID types.String `tfsdk:"ext_relation_id"`
	Enabled       types.Bool   `tfsdk:"enabled"`
}

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

func (r *UserResource) Schema(_ context.Context, _ resource.SchemaRequest, resp *resource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "Manages a VirtFusion user.",
		Attributes: map[string]schema.Attribute{
			"id": schema.Int64Attribute{
				MarkdownDescription: "The numeric ID of the user.",
				Computed:            true,
			},
			"name": schema.StringAttribute{
				MarkdownDescription: "The name of the user.",
				Required:            true,
			},
			"email": schema.StringAttribute{
				MarkdownDescription: "The email address of the user.",
				Required:            true,
			},
			"ext_relation_id": schema.StringAttribute{
				MarkdownDescription: "The external relation ID used to look up the user. Changing this forces a new resource to be created.",
				Required:            true,
				PlanModifiers: []planmodifier.String{
					stringplanmodifier.RequiresReplace(),
				},
			},
			"enabled": schema.BoolAttribute{
				MarkdownDescription: "Whether the user is enabled.",
				Computed:            true,
			},
		},
	}
}

func (r *UserResource) 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.", req.ProviderData),
		)
		return
	}

	r.client = c
}

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

	body := client.UserCreateRequest{
		Name:          data.Name.ValueString(),
		Email:         data.Email.ValueString(),
		ExtRelationID: data.ExtRelationID.ValueString(),
	}

	result, err := r.client.Post(ctx, "/users", body)
	if err != nil {
		resp.Diagnostics.AddError("Error creating user", err.Error())
		return
	}

	var userResp client.UserResponse
	if err := json.Unmarshal(result, &userResp); err != nil {
		resp.Diagnostics.AddError("Error parsing user response", err.Error())
		return
	}

	data.ID = types.Int64Value(userResp.Data.ID)
	data.Name = types.StringValue(userResp.Data.Name)
	data.Email = types.StringValue(userResp.Data.Email)
	data.ExtRelationID = types.StringValue(userResp.Data.ExtRelationID)
	data.Enabled = types.BoolValue(userResp.Data.Enabled)

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

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

	result, err := r.client.Get(ctx, fmt.Sprintf("/users/%s/byExtRelation", url.PathEscape(data.ExtRelationID.ValueString())))
	if err != nil {
		var apiErr *client.APIError
		if errors.As(err, &apiErr) && apiErr.IsNotFound() {
			resp.State.RemoveResource(ctx)
			return
		}
		resp.Diagnostics.AddError("Error reading user", err.Error())
		return
	}

	var userResp client.UserResponse
	if err := json.Unmarshal(result, &userResp); err != nil {
		resp.Diagnostics.AddError("Error parsing user response", err.Error())
		return
	}

	data.ID = types.Int64Value(userResp.Data.ID)
	data.Name = types.StringValue(userResp.Data.Name)
	data.Email = types.StringValue(userResp.Data.Email)
	data.ExtRelationID = types.StringValue(userResp.Data.ExtRelationID)
	data.Enabled = types.BoolValue(userResp.Data.Enabled)

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

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

	body := client.UserModifyRequest{
		Name:  data.Name.ValueString(),
		Email: data.Email.ValueString(),
	}

	result, err := r.client.Put(ctx, fmt.Sprintf("/users/%s/byExtRelation", url.PathEscape(data.ExtRelationID.ValueString())), body)
	if err != nil {
		resp.Diagnostics.AddError("Error updating user", err.Error())
		return
	}

	var userResp client.UserResponse
	if err := json.Unmarshal(result, &userResp); err != nil {
		resp.Diagnostics.AddError("Error parsing user response", err.Error())
		return
	}

	data.ID = types.Int64Value(userResp.Data.ID)
	data.Name = types.StringValue(userResp.Data.Name)
	data.Email = types.StringValue(userResp.Data.Email)
	data.ExtRelationID = types.StringValue(userResp.Data.ExtRelationID)
	data.Enabled = types.BoolValue(userResp.Data.Enabled)

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

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

	_, err := r.client.Delete(ctx, fmt.Sprintf("/users/%s/byExtRelation", url.PathEscape(data.ExtRelationID.ValueString())))
	if err != nil {
		var apiErr *client.APIError
		if errors.As(err, &apiErr) && apiErr.IsNotFound() {
			return
		}
		resp.Diagnostics.AddError("Error deleting user", err.Error())
	}
}

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