/*
 * MIT License
 *
 * Copyright (c) 2021 Nicolas JUHEL
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 *
 */

package logger

import (
	"fmt"
	"os"
	"strings"

	libval "github.com/go-playground/validator/v10"
	liberr "github.com/nabbar/golib/errors"
)

type FuncCustomConfig func(log Logger)

type NetworkType uint8

const (
	NetworkEmpty NetworkType = iota
	NetworkTCP
	NetworkUDP
)

func (n NetworkType) String() string {
	switch n {
	case NetworkTCP:
		return "tcp"
	case NetworkUDP:
		return "udp"
	default:
		return ""
	}
}

func MakeNetwork(net string) NetworkType {
	switch strings.ToLower(net) {
	case NetworkTCP.String():
		return NetworkTCP
	case NetworkUDP.String():
		return NetworkUDP
	default:
		return NetworkEmpty
	}
}

type OptionsFile struct {
	// LogLevel define the allowed level of log for this file.
	LogLevel []string `json:"logLevel,omitempty" yaml:"logLevel,omitempty" toml:"logLevel,omitempty" mapstructure:"logLevel,omitempty"`

	// Filepath define the file path for log to file.
	Filepath string `json:"filepath,omitempty" yaml:"filepath,omitempty" toml:"filepath,omitempty" mapstructure:"filepath,omitempty"`

	// Create define if the log file must exist or can create it.
	Create bool `json:"create,omitempty" yaml:"create,omitempty" toml:"create,omitempty" mapstructure:"create,omitempty"`

	// CreatePath define if the path of the log file must exist or can try to create it.
	CreatePath bool `json:"createPath,omitempty" yaml:"createPath,omitempty" toml:"createPath,omitempty" mapstructure:"createPath,omitempty"`

	// FileMode define mode to be used for the log file if the create it.
	FileMode os.FileMode `json:"fileMode,omitempty" yaml:"fileMode,omitempty" toml:"fileMode,omitempty" mapstructure:"fileMode,omitempty"`

	// PathMode define mode to be used for the path of the log file if create it.
	PathMode os.FileMode `json:"pathMode,omitempty" yaml:"pathMode,omitempty" toml:"pathMode,omitempty" mapstructure:"pathMode,omitempty"`

	// DisableStack allow to disable the goroutine id before each message.
	DisableStack bool `json:"disableStack,omitempty" yaml:"disableStack,omitempty" toml:"disableStack,omitempty" mapstructure:"disableStack,omitempty"`

	// DisableTimestamp allow to disable the timestamp before each message.
	DisableTimestamp bool `json:"disableTimestamp,omitempty" yaml:"disableTimestamp,omitempty" toml:"disableTimestamp,omitempty" mapstructure:"disableTimestamp,omitempty"`

	// EnableTrace allow to add the origin caller/file/line of each message.
	EnableTrace bool `json:"enableTrace,omitempty" yaml:"enableTrace,omitempty" toml:"enableTrace,omitempty" mapstructure:"enableTrace,omitempty"`

	// EnableAccessLog allow to add all message from api router for access log and error log.
	EnableAccessLog bool `json:"enableAccessLog,omitempty" yaml:"enableAccessLog,omitempty" toml:"enableAccessLog,omitempty" mapstructure:"enableAccessLog,omitempty"`
}

type OptionsFiles []OptionsFile

type OptionsSyslog struct {
	// LogLevel define the allowed level of log for this syslog.
	LogLevel []string `json:"logLevel,omitempty" yaml:"logLevel,omitempty" toml:"logLevel,omitempty" mapstructure:"logLevel,omitempty"`

	// Network define the network used to connect to this syslog (tcp, udp, or any other to a local connection).
	Network string `json:"network,omitempty" yaml:"network,omitempty" toml:"network,omitempty" mapstructure:"network,omitempty"`

	// Host define the remote syslog to use.
	// If Host and Network are empty, local syslog will be used.
	Host string `json:"host,omitempty" yaml:"host,omitempty" toml:"host,omitempty" mapstructure:"host,omitempty"`
	/*
		// Severity define the severity syslog to be used.
		Severity string `json:"severity,omitempty" yaml:"severity,omitempty" toml:"severity,omitempty" mapstructure:"severity,omitempty"`
	*/
	// Facility define the facility syslog to be used.
	Facility string `json:"facility,omitempty" yaml:"facility,omitempty" toml:"facility,omitempty" mapstructure:"facility,omitempty"`

	// Tag define the syslog tag used in linux syslog system or name of logger for windows event logger.
	// For window, this value must be unic for each syslog config
	Tag string `json:"tag,omitempty" yaml:"tag,omitempty" toml:"tag,omitempty" mapstructure:"tag,omitempty"`

	// DisableStack allow to disable the goroutine id before each message.
	DisableStack bool `json:"disableStack,omitempty" yaml:"disableStack,omitempty" toml:"disableStack,omitempty" mapstructure:"disableStack,omitempty"`

	// DisableTimestamp allow to disable the timestamp before each message.
	DisableTimestamp bool `json:"disableTimestamp,omitempty" yaml:"disableTimestamp,omitempty" toml:"disableTimestamp,omitempty" mapstructure:"disableTimestamp,omitempty"`

	// EnableTrace allow to add the origin caller/file/line of each message.
	EnableTrace bool `json:"enableTrace,omitempty" yaml:"enableTrace,omitempty" toml:"enableTrace,omitempty" mapstructure:"enableTrace,omitempty"`

	// EnableAccessLog allow to add all message from api router for access log and error log.
	EnableAccessLog bool `json:"enableAccessLog,omitempty" yaml:"enableAccessLog,omitempty" toml:"enableAccessLog,omitempty" mapstructure:"enableAccessLog,omitempty"`
}

type OptionsSyslogs []OptionsSyslog

type Options struct {
	// InheritDefault define if the current options will override a default options
	InheritDefault bool `json:"inheritDefault" yaml:"inheritDefault" toml:"inheritDefault" mapstructure:"inheritDefault"`

	// DisableStandard allow disabling to write log to standard output stdout/stderr.
	DisableStandard bool `json:"disableStandard,omitempty" yaml:"disableStandard,omitempty" toml:"disableStandard,omitempty" mapstructure:"disableStandard,omitempty"`

	// DisableStack allow to disable the goroutine id before each message.
	DisableStack bool `json:"disableStack,omitempty" yaml:"disableStack,omitempty" toml:"disableStack,omitempty" mapstructure:"disableStack,omitempty"`

	// DisableTimestamp allow to disable the timestamp before each message.
	DisableTimestamp bool `json:"disableTimestamp,omitempty" yaml:"disableTimestamp,omitempty" toml:"disableTimestamp,omitempty" mapstructure:"disableTimestamp,omitempty"`

	// EnableTrace allow to add the origin caller/file/line of each message.
	EnableTrace bool `json:"enableTrace,omitempty" yaml:"enableTrace,omitempty" toml:"enableTrace,omitempty" mapstructure:"enableTrace,omitempty"`

	// TraceFilter define the path to clean for trace.
	TraceFilter string `json:"traceFilter,omitempty" yaml:"traceFilter,omitempty" toml:"traceFilter,omitempty" mapstructure:"traceFilter,omitempty"`

	// DisableColor define if color could be use or not in messages format.
	// If the running process is not a tty, no color will be used.
	DisableColor bool `json:"disableColor,omitempty" yaml:"disableColor,omitempty" toml:"disableColor,omitempty" mapstructure:"disableColor,omitempty"`

	// EnableAccessLog allow to add all message from api router for access log and error log.
	EnableAccessLog bool `json:"enableAccessLog,omitempty" yaml:"enableAccessLog,omitempty" toml:"enableAccessLog,omitempty" mapstructure:"enableAccessLog,omitempty"`

	// LogFileExtend define if the logFile given is in addition of default LogFile or a replacement.
	LogFileExtend bool `json:"logFileExtend,omitempty" yaml:"logFileExtend,omitempty" toml:"logFileExtend,omitempty" mapstructure:"logFileExtend,omitempty"`

	// LogFile define a list of log file configuration to allow log to files.
	LogFile OptionsFiles `json:"logFile,omitempty" yaml:"logFile,omitempty" toml:"logFile,omitempty" mapstructure:"logFile,omitempty"`

	// LogSyslogExtend define if the logFile given is in addition of default LogSyslog or a replacement.
	LogSyslogExtend bool `json:"logSyslogExtend,omitempty" yaml:"logSyslogExtend,omitempty" toml:"logSyslogExtend,omitempty" mapstructure:"logSyslogExtend,omitempty"`

	// LogSyslog define a list of syslog configuration to allow log to syslog.
	LogSyslog OptionsSyslogs `json:"logSyslog,omitempty" yaml:"logSyslog,omitempty" toml:"logSyslog,omitempty" mapstructure:"logSyslog,omitempty"`

	// custom function handler.
	init   FuncCustomConfig
	change FuncCustomConfig

	// default options
	opts FuncOpt
}

// RegisterDefaultFunc allow to register a function called to retrieve default options for inheritDefault.
// If not set, the previous options will be used as default options.
// To clean function, just call RegisterDefaultFunc with nil as param.
func (o *Options) RegisterDefaultFunc(fct FuncOpt) {
	o.opts = fct
}

// RegisterFuncUpdateLogger allow to register a function called when init or update of logger.
// To clean function, just call RegisterFuncUpdateLogger with nil as param.
func (o *Options) RegisterFuncUpdateLogger(fct FuncCustomConfig) {
	o.init = fct
}

// RegisterFuncUpdateLevel allow to register a function called when init or update level
// To clean function, just call RegisterFuncUpdateLevel with nil as param.
func (o *Options) RegisterFuncUpdateLevel(fct FuncCustomConfig) {
	o.change = fct
}

// Validate allow checking if the options' struct is valid with the awaiting model
func (o *Options) Validate() liberr.Error {
	var e = ErrorValidatorError.Error(nil)

	if err := libval.New().Struct(o); err != nil {
		if er, ok := err.(*libval.InvalidValidationError); ok {
			e.AddParent(er)
		}

		for _, er := range err.(libval.ValidationErrors) {
			//nolint #goerr113
			e.AddParent(fmt.Errorf("config field '%s' is not validated by constraint '%s'", er.Namespace(), er.ActualTag()))
		}
	}

	if !e.HasParent() {
		e = nil
	}

	return e
}

func (o *Options) Clone() Options {
	return Options{
		DisableStandard:  o.DisableStandard,
		DisableStack:     o.DisableStack,
		DisableTimestamp: o.DisableTimestamp,
		EnableTrace:      o.EnableTrace,
		TraceFilter:      o.TraceFilter,
		DisableColor:     o.DisableColor,
		EnableAccessLog:  o.EnableAccessLog,
		LogFile:          o.LogFile.Clone(),
		LogSyslog:        o.LogSyslog.Clone(),
		init:             o.init,
		change:           o.change,
	}
}

func (o OptionsFile) Clone() OptionsFile {
	return OptionsFile{
		LogLevel:         o.LogLevel,
		Filepath:         o.Filepath,
		Create:           o.Create,
		CreatePath:       o.CreatePath,
		FileMode:         o.FileMode,
		PathMode:         o.PathMode,
		DisableStack:     o.DisableStack,
		DisableTimestamp: o.DisableTimestamp,
		EnableTrace:      o.EnableTrace,
		EnableAccessLog:  o.EnableAccessLog,
	}
}

func (o OptionsFiles) Clone() OptionsFiles {
	var c = make([]OptionsFile, 0)
	for _, i := range o {
		c = append(c, i.Clone())
	}
	return c
}

func (o OptionsSyslog) Clone() OptionsSyslog {
	return OptionsSyslog{
		LogLevel:         o.LogLevel,
		Network:          o.Network,
		Host:             o.Host,
		Facility:         o.Facility,
		Tag:              o.Tag,
		DisableStack:     o.DisableStack,
		DisableTimestamp: o.DisableTimestamp,
		EnableTrace:      o.EnableTrace,
		EnableAccessLog:  o.EnableAccessLog,
	}
}

func (o OptionsSyslogs) Clone() OptionsSyslogs {
	var c = make([]OptionsSyslog, 0)
	for _, i := range o {
		c = append(c, i.Clone())
	}
	return c
}