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

package log // import "go.opentelemetry.io/otel/sdk/log"

import (
	"context"

	"go.opentelemetry.io/otel/log"
	"go.opentelemetry.io/otel/log/embedded"
	"go.opentelemetry.io/otel/sdk/resource"
)

// Compile-time check LoggerProvider implements log.LoggerProvider.
var _ log.LoggerProvider = (*LoggerProvider)(nil)

// LoggerProvider handles the creation and coordination of Loggers. All Loggers
// created by a LoggerProvider will be associated with the same Resource.
type LoggerProvider struct {
	embedded.LoggerProvider
}

type providerConfig struct{}

// NewLoggerProvider returns a new and configured LoggerProvider.
//
// By default, the returned LoggerProvider is configured with the default
// Resource and no Processors. Processors cannot be added after a LoggerProvider is
// created. This means the returned LoggerProvider, one created with no
// Processors, will perform no operations.
func NewLoggerProvider(opts ...LoggerProviderOption) *LoggerProvider {
	// TODO (#5060): Implement.
	return nil
}

// Logger returns a new [log.Logger] with the provided name and configuration.
//
// This method can be called concurrently.
func (p *LoggerProvider) Logger(name string, opts ...log.LoggerOption) log.Logger {
	// TODO (#5060): Implement.
	return &logger{}
}

// Shutdown flushes queued log records and shuts down the decorated expoter.
//
// This method can be called concurrently.
func (p *LoggerProvider) Shutdown(ctx context.Context) error {
	// TODO (#5060): Implement.
	return nil
}

// ForceFlush flushes all exporters.
//
//	This method can be called concurrently.
func (p *LoggerProvider) ForceFlush(ctx context.Context) error {
	// TODO (#5060): Implement.
	return nil
}

// LoggerProviderOption applies a configuration option value to a LoggerProvider.
type LoggerProviderOption interface {
	apply(providerConfig) providerConfig
}

type loggerProviderOptionFunc func(providerConfig) providerConfig

func (fn loggerProviderOptionFunc) apply(c providerConfig) providerConfig {
	return fn(c)
}

// WithResource associates a Resource with a LoggerProvider. This Resource
// represents the entity producing telemetry and is associated with all Loggers
// the LoggerProvider will create.
//
// By default, if this Option is not used, the default Resource from the
// go.opentelemetry.io/otel/sdk/resource package will be used.
func WithResource(res *resource.Resource) LoggerProviderOption {
	return loggerProviderOptionFunc(func(cfg providerConfig) providerConfig {
		// TODO (#5060): Implement.
		return cfg
	})
}

// WithProcessor associates Processor with a LoggerProvider.
//
// By default, if this option is not used, the LoggerProvider will perform no
// operations; no data will be exported without a processor.
//
// Each WithProcessor creates a separate pipeline. Use custom decorators
// for advanced scenarios such as enriching with attributes.
//
// For production, use [NewBatchingProcessor] to batch log records before they are exported.
// For testing and debugging, use [NewSimpleProcessor] to synchronously export log records.
func WithProcessor(processor Processor) LoggerProviderOption {
	return loggerProviderOptionFunc(func(cfg providerConfig) providerConfig {
		// TODO (#5060): Implement.
		return cfg
	})
}

// WithAttributeCountLimit sets the maximum allowed log record attribute count.
// Any attribute added to a log record once this limit is reached will be dropped.
//
// Setting this to zero means no attributes will be recorded.
//
// Setting this to a negative value means no limit is applied.
//
// If the OTEL_LOGRECORD_ATTRIBUTE_COUNT_LIMIT environment variable is set,
// and this option is not passed, that variable value will be used.
//
// By default, if an environment variable is not set, and this option is not
// passed, 128 will be used.
func WithAttributeCountLimit(limit int) LoggerProviderOption {
	return loggerProviderOptionFunc(func(cfg providerConfig) providerConfig {
		// TODO (#5060): Implement.
		return cfg
	})
}

// AttributeValueLengthLimit sets the maximum allowed attribute value length.
//
// This limit only applies to string and string slice attribute values.
// Any string longer than this value will be truncated to this length.
//
// Setting this to a negative value means no limit is applied.
//
// If the OTEL_LOGRECORD_ATTRIBUTE_VALUE_LENGTH_LIMIT environment variable is set,
// and this option is not passed, that variable value will be used.
//
// By default, if an environment variable is not set, and this option is not
// passed, no limit (-1) will be used.
func WithAttributeValueLengthLimit(limit int) LoggerProviderOption {
	return loggerProviderOptionFunc(func(cfg providerConfig) providerConfig {
		// TODO (#5060): Implement.
		return cfg
	})
}