package log

import (
	"OpenIM/pkg/common/constant"
	"OpenIM/pkg/common/tracelog"
	"context"
	"time"

	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
)

var (
	pkgLogger Logger = &ZapLogger{}
)

// InitFromConfig initializes a Zap-based logger
func InitFromConfig(name string) error {
	l, err := NewZapLogger()
	if err != nil {
		return err
	}
	pkgLogger = l.WithCallDepth(2).WithName(name)
	return nil
}

func Debug(ctx context.Context, msg string, keysAndValues ...interface{}) {
	pkgLogger.Debug(ctx, msg, keysAndValues...)
}

func Info(ctx context.Context, msg string, keysAndValues ...interface{}) {
	pkgLogger.Info(ctx, msg, keysAndValues...)
}

func Warn(ctx context.Context, msg string, err error, keysAndValues ...interface{}) {
	pkgLogger.Warn(ctx, msg, err, keysAndValues...)
}

func Error(ctx context.Context, msg string, err error, keysAndValues ...interface{}) {
	pkgLogger.Error(ctx, msg, err, keysAndValues...)
}

type Logger interface {
	Debug(ctx context.Context, msg string, keysAndValues ...interface{})
	Info(ctx context.Context, msg string, keysAndValues ...interface{})
	Warn(ctx context.Context, msg string, err error, keysAndValues ...interface{})
	Error(ctx context.Context, msg string, err error, keysAndValues ...interface{})
	WithValues(keysAndValues ...interface{}) Logger
	WithName(name string) Logger
	WithCallDepth(depth int) Logger
	WithItemSampler() Logger
	// WithoutSampler returns the original logger without sampling
	WithoutSampler() Logger
}

type ZapLogger struct {
	zap *zap.SugaredLogger
	// store original logger without sampling to avoid multiple samplers
	unsampled      *zap.SugaredLogger
	SampleDuration time.Duration
	SampleInitial  int
	SampleInterval int
}

func NewZapLogger() (*ZapLogger, error) {
	zapConfig := zap.Config{
		Level:         zap.NewAtomicLevelAt(zapcore.DebugLevel),
		Development:   true,
		Encoding:      "json",
		EncoderConfig: zap.NewProductionEncoderConfig(),
		OutputPaths:   []string{"stdout"},
		Sampling: &zap.SamplingConfig{
			Initial:    0,
			Thereafter: 0,
			Hook:       nil,
		},
	}
	l, err := zapConfig.Build()
	if err != nil {
		return nil, err
	}
	zl := &ZapLogger{
		unsampled: l.Sugar(),
	}

	return zl, nil
}

func (l *ZapLogger) ToZap() *zap.SugaredLogger {
	return l.zap
}

func (l *ZapLogger) Debug(ctx context.Context, msg string, keysAndValues ...interface{}) {
	keysAndValues = append([]interface{}{constant.OperationID, tracelog.GetOperationID(ctx)}, keysAndValues...)
	l.zap.Debugw(msg, keysAndValues...)
}

func (l *ZapLogger) Info(ctx context.Context, msg string, keysAndValues ...interface{}) {
	keysAndValues = append([]interface{}{constant.OperationID, tracelog.GetOperationID(ctx)}, keysAndValues...)
	l.zap.Infow(msg, keysAndValues...)
}

func (l *ZapLogger) Warn(ctx context.Context, msg string, err error, keysAndValues ...interface{}) {
	if err != nil {
		keysAndValues = append(keysAndValues, "error", err)
	}
	keysAndValues = append([]interface{}{constant.OperationID, tracelog.GetOperationID(ctx)}, keysAndValues...)
	l.zap.Warnw(msg, keysAndValues...)
}

func (l *ZapLogger) Error(ctx context.Context, msg string, err error, keysAndValues ...interface{}) {
	if err != nil {
		keysAndValues = append(keysAndValues, "error", err)
	}
	keysAndValues = append([]interface{}{constant.OperationID, tracelog.GetOperationID(ctx)}, keysAndValues...)
	l.zap.Errorw(msg, keysAndValues...)
}

func (l *ZapLogger) WithValues(keysAndValues ...interface{}) Logger {
	dup := *l
	dup.zap = l.zap.With(keysAndValues...)
	if l.unsampled == l.zap {
		dup.unsampled = dup.zap
	} else {
		dup.unsampled = l.unsampled.With(keysAndValues...)
	}
	return &dup
}

func (l *ZapLogger) WithName(name string) Logger {
	dup := *l
	dup.zap = l.zap.Named(name)
	if l.unsampled == l.zap {
		dup.unsampled = dup.zap
	} else {
		dup.unsampled = l.unsampled.Named(name)
	}
	return &dup
}

func (l *ZapLogger) WithCallDepth(depth int) Logger {
	dup := *l
	dup.zap = l.zap.WithOptions(zap.AddCallerSkip(depth))
	if l.unsampled == l.zap {
		dup.unsampled = dup.zap
	} else {
		dup.unsampled = l.unsampled.WithOptions(zap.AddCallerSkip(depth))
	}
	return &dup
}

func (l *ZapLogger) WithItemSampler() Logger {
	if l.SampleDuration == 0 {
		return l
	}
	dup := *l
	dup.zap = l.unsampled.WithOptions(zap.WrapCore(func(core zapcore.Core) zapcore.Core {
		return zapcore.NewSamplerWithOptions(
			core,
			l.SampleDuration,
			l.SampleInitial,
			l.SampleInterval,
		)
	}))
	return &dup
}

func (l *ZapLogger) WithoutSampler() Logger {
	if l.SampleDuration == 0 {
		return l
	}
	dup := *l
	dup.zap = l.unsampled
	return &dup
}