// Package observability provides logging and metrics infrastructure
package observability

import (
	"context"
	"log/slog"
	"os"
)

// Logger defines the logging interface
type Logger interface {
	// Debug logs a debug message
	Debug(msg string, args ...any)

	// Info logs an info message
	Info(msg string, args ...any)

	// Warn logs a warning message
	Warn(msg string, args ...any)

	// Error logs an error message
	Error(msg string, args ...any)

	// With returns a logger with additional context fields
	With(args ...any) Logger

	// WithContext returns a logger with context
	WithContext(ctx context.Context) Logger
}

// slogLogger wraps slog.Logger to implement our Logger interface
type slogLogger struct {
	logger *slog.Logger
}

// NewLogger creates a new structured logger
func NewLogger(level slog.Level) Logger {
	opts := &slog.HandlerOptions{
		Level:     level,
		AddSource: true,
	}

	handler := slog.NewJSONHandler(os.Stdout, opts)
	logger := slog.New(handler)

	return &slogLogger{
		logger: logger,
	}
}

func (l *slogLogger) Debug(msg string, args ...any) {
	l.logger.Debug(msg, args...)
}

func (l *slogLogger) Info(msg string, args ...any) {
	l.logger.Info(msg, args...)
}

func (l *slogLogger) Warn(msg string, args ...any) {
	l.logger.Warn(msg, args...)
}

func (l *slogLogger) Error(msg string, args ...any) {
	l.logger.Error(msg, args...)
}

func (l *slogLogger) With(args ...any) Logger {
	return &slogLogger{
		logger: l.logger.With(args...),
	}
}

func (l *slogLogger) WithContext(ctx context.Context) Logger {
	// Could extract trace ID, request ID, etc. from context
	return l
}