package logger

import (
	"fmt"

	"github.com/ThreeDotsLabs/watermill"
	"github.com/apache/pulsar-client-go/pulsar/log"

	"go.yandata.net/iod/iod/trustlog-sdk/api/logger"
)

const (
	// argsPerField 每个字段转换为args时的参数数量（key+value）.
	argsPerField = 2
)

type WatermillLoggerAdapter struct {
	logger logger.Logger
	fields watermill.LogFields
}

func (w WatermillLoggerAdapter) Error(msg string, err error, fields watermill.LogFields) {
	allFields := mergeFields(w.fields, fields)
	args := allFieldsToArgs(allFields)
	w.logger.Error(fmt.Sprintf("%s: %v", msg, err), args...)
}

func (w WatermillLoggerAdapter) Info(msg string, fields watermill.LogFields) {
	allFields := mergeFields(w.fields, fields)
	args := allFieldsToArgs(allFields)
	w.logger.Info(msg, args...)
}

func (w WatermillLoggerAdapter) Debug(msg string, fields watermill.LogFields) {
	allFields := mergeFields(w.fields, fields)
	args := allFieldsToArgs(allFields)
	w.logger.Debug(msg, args...)
}

func (w WatermillLoggerAdapter) Trace(msg string, fields watermill.LogFields) {
	allFields := mergeFields(w.fields, fields)
	args := allFieldsToArgs(allFields)
	w.logger.Debug(fmt.Sprintf("[TRACE] %s", msg), args...)
}

func (w WatermillLoggerAdapter) With(fields watermill.LogFields) watermill.LoggerAdapter {
	newFields := mergeFields(w.fields, fields)
	return WatermillLoggerAdapter{
		logger: w.logger,
		fields: newFields,
	}
}

//nolint:funcorder // 构造函数放在此处更符合代码组织
func NewWatermillLoggerAdapter(logger logger.Logger) *WatermillLoggerAdapter {
	return &WatermillLoggerAdapter{logger: logger, fields: watermill.LogFields{}}
}

func mergeFields(base, extra watermill.LogFields) watermill.LogFields {
	merged := make(watermill.LogFields, len(base)+len(extra))
	for k, v := range base {
		merged[k] = v
	}
	for k, v := range extra {
		merged[k] = v
	}
	return merged
}

func allFieldsToArgs(fields watermill.LogFields) []any {
	args := make([]any, 0, len(fields)*argsPerField)
	for k, v := range fields {
		args = append(args, k, v)
	}
	return args
}

// ================= PulsarLoggerAdapter ======================

type PulsarLoggerAdapter struct {
	logger logger.Logger
	fields log.Fields
	err    error
}

func NewPulsarLoggerAdapter(l logger.Logger) *PulsarLoggerAdapter {
	return &PulsarLoggerAdapter{logger: l, fields: log.Fields{}}
}

func (p PulsarLoggerAdapter) SubLogger(fields log.Fields) log.Logger {
	return PulsarLoggerAdapter{
		logger: p.logger,
		fields: mergePulsarFields(p.fields, fields),
		err:    p.err,
	}
}

func (p PulsarLoggerAdapter) WithFields(fields log.Fields) log.Entry {
	return PulsarLoggerAdapter{
		logger: p.logger,
		fields: mergePulsarFields(p.fields, fields),
		err:    p.err,
	}
}

func (p PulsarLoggerAdapter) WithField(name string, value interface{}) log.Entry {
	newFields := mergePulsarFields(p.fields, log.Fields{name: value})
	return PulsarLoggerAdapter{
		logger: p.logger,
		fields: newFields,
		err:    p.err,
	}
}

func (p PulsarLoggerAdapter) WithError(err error) log.Entry {
	return PulsarLoggerAdapter{
		logger: p.logger,
		fields: p.fields,
		err:    err,
	}
}

func (p PulsarLoggerAdapter) Debug(args ...interface{}) {
	fieldsArgs := fieldsToArgs(p.fields)
	p.logger.Debug(fmt.Sprint(args...), fieldsArgs...)
}

func (p PulsarLoggerAdapter) Info(args ...interface{}) {
	fieldsArgs := fieldsToArgs(p.fields)
	p.logger.Info(fmt.Sprint(args...), fieldsArgs...)
}

func (p PulsarLoggerAdapter) Warn(args ...interface{}) {
	fieldsArgs := fieldsToArgs(p.fields)
	p.logger.Warn(fmt.Sprint(args...), fieldsArgs...)
}

func (p PulsarLoggerAdapter) Error(args ...interface{}) {
	msg := fmt.Sprint(args...)
	fieldsArgs := fieldsToArgs(p.fields)
	if p.err != nil {
		// 将error作为key-value对添加到args中
		fieldsArgs = append(fieldsArgs, "error", p.err)
		p.logger.Error(msg, fieldsArgs...)
	} else {
		p.logger.Error(msg, fieldsArgs...)
	}
}

func (p PulsarLoggerAdapter) Debugf(format string, args ...interface{}) {
	fieldsArgs := fieldsToArgs(p.fields)
	p.logger.Debug(fmt.Sprintf(format, args...), fieldsArgs...)
}

func (p PulsarLoggerAdapter) Infof(format string, args ...interface{}) {
	fieldsArgs := fieldsToArgs(p.fields)
	p.logger.Info(fmt.Sprintf(format, args...), fieldsArgs...)
}

func (p PulsarLoggerAdapter) Warnf(format string, args ...interface{}) {
	fieldsArgs := fieldsToArgs(p.fields)
	p.logger.Warn(fmt.Sprintf(format, args...), fieldsArgs...)
}

func (p PulsarLoggerAdapter) Errorf(format string, args ...interface{}) {
	msg := fmt.Sprintf(format, args...)
	fieldsArgs := fieldsToArgs(p.fields)
	if p.err != nil {
		p.logger.Error(fmt.Sprintf("%s: %v", msg, p.err), fieldsArgs...)
	} else {
		p.logger.Error(msg, fieldsArgs...)
	}
}

// 合并 Pulsar log.Fields.
func mergePulsarFields(base, extra log.Fields) log.Fields {
	merged := make(log.Fields, len(base)+len(extra))
	for k, v := range base {
		merged[k] = v
	}
	for k, v := range extra {
		merged[k] = v
	}
	return merged
}

// 将 Pulsar log.Fields 转为 args ...any 形式，适配 Adapter.
func fieldsToArgs(fields log.Fields) []any {
	args := make([]any, 0, len(fields)*argsPerField)
	for k, v := range fields {
		args = append(args, k, v)
	}
	return args
}