package fog

import (
	"bytes"
	"net/http"
	"time"
)

// Google cloud log level names, which correspond to functionality provided. GCP
// has a DEFAULT log level below DEBUG, but it is not used.
//
// https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#logseverity
const (
	Debug     = "DEBUG"     // Debug or trace information.
	Info      = "INFO"      // Routine information, such as ongoing status or performance.
	Notice    = "NOTICE"    // Normal but significant events, such as start up, shut down, or a configuration change.
	Warning   = "WARNING"   // Warning events might cause problems.
	Error     = "ERROR"     // Error events are likely to cause problems.
	Critical  = "CRITICAL"  // Critical events cause more severe problems or outages.
	Alert     = "ALERT"     // A person must take an action immediately.
	Emergency = "EMERGENCY" // One or more systems are unusable.
)

// Zap's log severity levels as ints, these levels get more verbose as the number gets smaller and more important
// and the number gets larger (DebugLevel is -1, InfoLevel is 0, WarnLevel is 1, and so on).
const (
	DEBUG  = -1
	INFO   = 0
	WARN   = 1
	ERROR  = 2
	DPANIC = 3
	PANIC  = 4
	FATAL  = 5
)

// Constants for Google cloud structured logging keys
// https://cloud.google.com/logging/docs/agent/logging/configuration#special-fields
const (
	TimeKey       = "time"
	LevelKey      = "severity"
	CallerKey     = "caller"
	MessageKey    = "message"
	StacktraceKey = "stacktrace"
	SourceKey     = "logging.googleapis.com/sourceLocation"
	labelsKey     = "logging.googleapis.com/labels"
	operationKey  = "logging.googleapis.com/operation"
)

const (
	// errorKey is the key that error values are logged with
	errorKey = "error"
	// lvlKey is the key that numeric V level values are logged with
	lvlKey = "level"
	// gcpLabelKey is the constant that is used to check if a map is one that is passed in by the Label command
	gcpLabelKey = "gcpLabel."
	// gcpOperationKey is the constant that is used to check if a map is one that is passed in by the Operation command
	gcpOperationKey = "gcpOperation."
)

const (
	OperationKey = "logging.googleapis.com/operation"
	SeverityKey  = "severity"
)

// MiddlewareContext is a struct through which the middleware logger obtains http request information, including status
// and request size, as well as response body information from the middleware handler

type MiddlewareContext struct {
	Request *http.Request
	Status  int
	Size    int
	Body    *bytes.Buffer
	Time    time.Duration
}

// Option controls how the underlying Zap logger is constructed.
type Option func(*options)