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

// NewSSHKeyDataSource returns a new SSH key data source.
func NewSSHKeyDataSource() datasource.DataSource {
	return &SSHKeyDataSource{}
}

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

// SSHKeyDataSourceModel describes the data source data model.
type SSHKeyDataSourceModel struct {
	ID        types.Int64  `tfsdk:"id"`
	Name      types.String `tfsdk:"name"`
	Type      types.String `tfsdk:"type"`
	PublicKey types.String `tfsdk:"public_key"`
	Enabled   types.Bool   `tfsdk:"enabled"`
	UserID    types.Int64  `tfsdk:"user_id"`
	CreatedAt types.String `tfsdk:"created_at"`
	UpdatedAt types.String `tfsdk:"updated_at"`
}

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

func (d *SSHKeyDataSource) Schema(_ context.Context, _ datasource.SchemaRequest, resp *datasource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "Fetches a single VirtFusion SSH key by ID.",
		Attributes: map[string]schema.Attribute{
			"id": schema.Int64Attribute{
				MarkdownDescription: "The SSH key ID.",
				Required:            true,
			},
			"name": schema.StringAttribute{
				MarkdownDescription: "The SSH key name.",
				Computed:            true,
			},
			"type": schema.StringAttribute{
				MarkdownDescription: "The SSH key type.",
				Computed:            true,
			},
			"public_key": schema.StringAttribute{
				MarkdownDescription: "The public key content.",
				Computed:            true,
			},
			"enabled": schema.BoolAttribute{
				MarkdownDescription: "Whether the SSH key is enabled.",
				Computed:            true,
			},
			"user_id": schema.Int64Attribute{
				MarkdownDescription: "The ID of the user who owns this SSH key.",
				Computed:            true,
			},
			"created_at": schema.StringAttribute{
				MarkdownDescription: "The creation timestamp.",
				Computed:            true,
			},
			"updated_at": schema.StringAttribute{
				MarkdownDescription: "The last update timestamp.",
				Computed:            true,
			},
		},
	}
}

func (d *SSHKeyDataSource) 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 *SSHKeyDataSource) Read(ctx context.Context, req datasource.ReadRequest, resp *datasource.ReadResponse) {
	var data SSHKeyDataSourceModel
	resp.Diagnostics.Append(req.Config.Get(ctx, &data)...)
	if resp.Diagnostics.HasError() {
		return
	}

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

	var sshKeyResp client.SSHKeyResponse
	if err := json.Unmarshal(rawResp, &sshKeyResp); err != nil {
		resp.Diagnostics.AddError("Error Parsing SSH Key Response", err.Error())
		return
	}

	data.ID = types.Int64Value(sshKeyResp.Data.ID)
	data.Name = types.StringValue(sshKeyResp.Data.Name)
	data.Type = types.StringValue(sshKeyResp.Data.Type)
	data.PublicKey = types.StringValue(sshKeyResp.Data.PublicKey)
	data.Enabled = types.BoolValue(sshKeyResp.Data.Enabled)
	data.UserID = types.Int64Value(sshKeyResp.Data.UserID)
	data.CreatedAt = types.StringValue(sshKeyResp.Data.CreatedAt)
	data.UpdatedAt = types.StringValue(sshKeyResp.Data.UpdatedAt)

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