// 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              = &HypervisorDataSource{}
	_ datasource.DataSourceWithConfigure = &HypervisorDataSource{}
)

// NewHypervisorDataSource returns a new hypervisor data source.
func NewHypervisorDataSource() datasource.DataSource {
	return &HypervisorDataSource{}
}

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

// HypervisorDataSourceModel describes the data source data model.
type HypervisorDataSourceModel 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 *HypervisorDataSource) Metadata(_ context.Context, req datasource.MetadataRequest, resp *datasource.MetadataResponse) {
	resp.TypeName = req.ProviderTypeName + "_hypervisor"
}

func (d *HypervisorDataSource) Schema(_ context.Context, _ datasource.SchemaRequest, resp *datasource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "Fetches a single VirtFusion hypervisor by ID.",
		Attributes: map[string]schema.Attribute{
			"id": schema.Int64Attribute{
				MarkdownDescription: "The hypervisor ID.",
				Required:            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 *HypervisorDataSource) 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 *HypervisorDataSource) Read(ctx context.Context, req datasource.ReadRequest, resp *datasource.ReadResponse) {
	var data HypervisorDataSourceModel
	resp.Diagnostics.Append(req.Config.Get(ctx, &data)...)
	if resp.Diagnostics.HasError() {
		return
	}

	rawResp, err := d.client.Get(ctx, fmt.Sprintf("/compute/hypervisors/%d", data.ID.ValueInt64()))
	if err != nil {
		resp.Diagnostics.AddError("Error Reading Hypervisor", err.Error())
		return
	}

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

	data.ID = types.Int64Value(hypervisorResp.Data.ID)
	data.Name = types.StringValue(hypervisorResp.Data.Name)
	data.Type = types.StringValue(hypervisorResp.Data.Type)
	data.Hostname = types.StringValue(hypervisorResp.Data.Hostname)
	data.Enabled = types.BoolValue(hypervisorResp.Data.Enabled)

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