// 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/attr"
	"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 = &ServersByUserDataSource{}
var _ datasource.DataSourceWithConfigure = &ServersByUserDataSource{}

// NewServersByUserDataSource returns a new data source for listing servers by user.
func NewServersByUserDataSource() datasource.DataSource {
	return &ServersByUserDataSource{}
}

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

// ServersByUserDataSourceModel describes the data source data model.
type ServersByUserDataSourceModel struct {
	UserID  types.Int64 `tfsdk:"user_id"`
	Results types.Int64 `tfsdk:"results"`
	Servers types.List  `tfsdk:"servers"`
}

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

func (d *ServersByUserDataSource) Schema(_ context.Context, _ datasource.SchemaRequest, resp *datasource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "Use this data source to list all VirtFusion servers owned by a specific user.",
		Attributes: map[string]schema.Attribute{
			"user_id": schema.Int64Attribute{
				MarkdownDescription: "The user ID to filter servers by.",
				Required:            true,
			},
			"results": resultsSchemaAttribute(),
			"servers": schema.ListNestedAttribute{
				MarkdownDescription: "The list of servers owned by the user.",
				Computed:            true,
				NestedObject: schema.NestedAttributeObject{
					Attributes: serverDataSourceSchemaAttributes(),
				},
			},
		},
	}
}

func (d *ServersByUserDataSource) 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. Please report this issue to the provider developers.", req.ProviderData),
		)
		return
	}

	d.client = c
}

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

	result, err := d.client.GetAllPages(ctx, fmt.Sprintf("/servers/user/%d?%s", data.UserID.ValueInt64(), resultsQueryParam(data.Results)))
	if err != nil {
		resp.Diagnostics.AddError("Error Reading Servers By User", err.Error())
		return
	}

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

	serverObjects := make([]attr.Value, len(listResp.Data))
	for i, s := range listResp.Data {
		obj, diags := types.ObjectValue(
			serverDataSourceAttrTypes(),
			serverDataToAttrValues(s),
		)
		resp.Diagnostics.Append(diags...)
		if resp.Diagnostics.HasError() {
			return
		}
		serverObjects[i] = obj
	}

	serversList, diags := types.ListValue(types.ObjectType{AttrTypes: serverDataSourceAttrTypes()}, serverObjects)
	resp.Diagnostics.Append(diags...)
	if resp.Diagnostics.HasError() {
		return
	}

	data.Servers = serversList

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