// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0

package azureblobreceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/azureblobreceiver"

import (
	"context"
	"errors"

	"go.opentelemetry.io/collector/component"
	"go.opentelemetry.io/collector/consumer"
	"go.opentelemetry.io/collector/receiver"
	"go.uber.org/zap"

	"github.com/open-telemetry/opentelemetry-collector-contrib/internal/sharedcomponent"
	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/azureblobreceiver/internal/metadata"
)

const (
	logsContainerName   = "logs"
	tracesContainerName = "traces"
)

var (
	errUnexpectedConfigurationType = errors.New("failed to cast configuration to Azure Blob Config")
)

type blobReceiverFactory struct {
	receivers *sharedcomponent.SharedComponents
}

// NewFactory returns a factory for Azure Blob receiver.
func NewFactory() receiver.Factory {
	f := &blobReceiverFactory{
		receivers: sharedcomponent.NewSharedComponents(),
	}

	return receiver.NewFactory(
		metadata.Type,
		f.createDefaultConfig,
		receiver.WithTraces(f.createTracesReceiver, metadata.TracesStability),
		receiver.WithLogs(f.createLogsReceiver, metadata.LogsStability))
}

func (f *blobReceiverFactory) createDefaultConfig() component.Config {
	return &Config{
		Logs:   LogsConfig{ContainerName: logsContainerName},
		Traces: TracesConfig{ContainerName: tracesContainerName},
	}
}

func (f *blobReceiverFactory) createLogsReceiver(
	_ context.Context,
	set receiver.CreateSettings,
	cfg component.Config,
	nextConsumer consumer.Logs,
) (receiver.Logs, error) {

	receiver, err := f.getReceiver(set, cfg)

	if err != nil {
		set.Logger.Error(err.Error())
		return nil, err
	}

	receiver.(logsDataConsumer).setNextLogsConsumer(nextConsumer)

	return receiver, nil
}

func (f *blobReceiverFactory) createTracesReceiver(
	_ context.Context,
	set receiver.CreateSettings,
	cfg component.Config,
	nextConsumer consumer.Traces,
) (receiver.Traces, error) {

	receiver, err := f.getReceiver(set, cfg)

	if err != nil {
		set.Logger.Error(err.Error())
		return nil, err
	}

	receiver.(tracesDataConsumer).setNextTracesConsumer(nextConsumer)
	return receiver, nil
}

func (f *blobReceiverFactory) getReceiver(
	set receiver.CreateSettings,
	cfg component.Config) (component.Component, error) {

	var err error
	r := f.receivers.GetOrAdd(cfg, func() component.Component {
		receiverConfig, ok := cfg.(*Config)

		if !ok {
			err = errUnexpectedConfigurationType
			return nil
		}

		var beh blobEventHandler
		beh, err = f.getBlobEventHandler(receiverConfig, set.Logger)
		if err != nil {
			return nil
		}

		var receiver component.Component
		receiver, err = newReceiver(set, beh)
		return receiver
	})

	if err != nil {
		return nil, err
	}

	return r.Unwrap(), err
}

func (f *blobReceiverFactory) getBlobEventHandler(cfg *Config, logger *zap.Logger) (blobEventHandler, error) {
	bc, err := newBlobClient(cfg.ConnectionString, logger)
	if err != nil {
		return nil, err
	}

	return newBlobEventHandler(cfg.EventHub.EndPoint, cfg.Logs.ContainerName, cfg.Traces.ContainerName, bc, logger),
		nil
}