// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0

package discover

import (
	"context"
	"fmt"
	"log"
	"time"

	hcpclient "github.com/hashicorp/consul/agent/hcp/client"
	"github.com/hashicorp/consul/agent/hcp/config"
)

type Provider struct {
}

var (
	defaultTimeout = 5 * time.Second
)

type providerConfig struct {
	config.CloudConfig

	timeout time.Duration
}

func (p *Provider) Addrs(args map[string]string, l *log.Logger) ([]string, error) {
	cfg, err := parseArgs(args)
	if err != nil {
		return nil, err
	}

	client, err := hcpclient.NewClient(cfg.CloudConfig)
	if err != nil {
		return nil, err
	}

	ctx, cancel := context.WithTimeout(context.Background(), cfg.timeout)
	defer cancel()
	servers, err := client.DiscoverServers(ctx)
	if err != nil {
		return nil, err
	}

	return servers, nil
}

func (p *Provider) Help() string {
	return ""
}

func parseArgs(args map[string]string) (cfg providerConfig, err error) {
	cfg.timeout = defaultTimeout

	if id, ok := args["resource_id"]; ok {
		cfg.ResourceID = id
	} else {
		err = fmt.Errorf("'resource_id' was not found and is required")
	}

	if cid, ok := args["client_id"]; ok {
		cfg.ClientID = cid
	}

	if csec, ok := args["client_secret"]; ok {
		cfg.ClientSecret = csec
	}

	if timeoutRaw, ok := args["timeout"]; ok {
		timeout, err := time.ParseDuration(timeoutRaw)
		if err != nil {
			return cfg, err
		}
		cfg.timeout = timeout
	}
	return
}