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

package provider

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

	"terraform-provider-virtfusion/internal/client"

	"github.com/hashicorp/terraform-plugin-framework/datasource"
	"github.com/hashicorp/terraform-plugin-framework/datasource/schema"
	"github.com/hashicorp/terraform-plugin-framework/types"
)

var (
	_ datasource.DataSource              = &HypervisorsDataSource{}
	_ datasource.DataSourceWithConfigure = &HypervisorsDataSource{}
)

// NewHypervisorsDataSource returns a new hypervisors data source.
func NewHypervisorsDataSource() datasource.DataSource {
	return &HypervisorsDataSource{}
}

// HypervisorsDataSource defines the data source implementation.
type HypervisorsDataSource struct {
	client *client.Client
}

// HypervisorsDataSourceModel describes the data source data model.
type HypervisorsDataSourceModel struct {
	Results     types.Int64           `tfsdk:"results"`
	Hypervisors []HypervisorItemModel `tfsdk:"hypervisors"`
}

// HypervisorItemModel describes a single hypervisor in the list.
type HypervisorItemModel struct {
	ID       types.Int64  `tfsdk:"id"`
	Name     types.String `tfsdk:"name"`
	Type     types.String `tfsdk:"type"`
	Hostname types.String `tfsdk:"hostname"`
	Enabled  types.Bool   `tfsdk:"enabled"`
}

func (d *HypervisorsDataSource) Metadata(_ context.Context, req datasource.MetadataRequest, resp *datasource.MetadataResponse) {
	resp.TypeName = req.ProviderTypeName + "_hypervisors"
}

func (d *HypervisorsDataSource) Schema(_ context.Context, _ datasource.SchemaRequest, resp *datasource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "Fetches all VirtFusion hypervisors.",
		Attributes: map[string]schema.Attribute{
			"results": resultsSchemaAttribute(),
			"hypervisors": schema.ListNestedAttribute{
				MarkdownDescription: "List of hypervisors.",
				Computed:            true,
				NestedObject: schema.NestedAttributeObject{
					Attributes: map[string]schema.Attribute{
						"id": schema.Int64Attribute{
							MarkdownDescription: "The hypervisor ID.",
							Computed:            true,
						},
						"name": schema.StringAttribute{
							MarkdownDescription: "The hypervisor name.",
							Computed:            true,
						},
						"type": schema.StringAttribute{
							MarkdownDescription: "The hypervisor type.",
							Computed:            true,
						},
						"hostname": schema.StringAttribute{
							MarkdownDescription: "The hypervisor hostname.",
							Computed:            true,
						},
						"enabled": schema.BoolAttribute{
							MarkdownDescription: "Whether the hypervisor is enabled.",
							Computed:            true,
						},
					},
				},
			},
		},
	}
}

func (d *HypervisorsDataSource) Configure(_ context.Context, req datasource.ConfigureRequest, resp *datasource.ConfigureResponse) {
	if req.ProviderData == nil {
		return
	}

	c, ok := req.ProviderData.(*client.Client)
	if !ok {
		resp.Diagnostics.AddError(
			"Unexpected Data Source Configure Type",
			fmt.Sprintf("Expected *client.Client, got: %T.", req.ProviderData),
		)
		return
	}

	d.client = c
}

func (d *HypervisorsDataSource) Read(ctx context.Context, req datasource.ReadRequest, resp *datasource.ReadResponse) {
	var data HypervisorsDataSourceModel

	rawResp, err := d.client.GetAllPages(ctx, fmt.Sprintf("/compute/hypervisors?%s", resultsQueryParam(data.Results)))
	if err != nil {
		resp.Diagnostics.AddError("Error Reading Hypervisors", err.Error())
		return
	}

	var listResp client.HypervisorListResponse
	if err := json.Unmarshal(rawResp, &listResp); err != nil {
		resp.Diagnostics.AddError("Error Parsing Hypervisors Response", err.Error())
		return
	}

	data.Hypervisors = make([]HypervisorItemModel, len(listResp.Data))
	for i, h := range listResp.Data {
		data.Hypervisors[i] = HypervisorItemModel{
			ID:       types.Int64Value(h.ID),
			Name:     types.StringValue(h.Name),
			Type:     types.StringValue(h.Type),
			Hostname: types.StringValue(h.Hostname),
			Enabled:  types.BoolValue(h.Enabled),
		}
	}

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