package parsers

import (
	"fmt"

	"github.com/influxdata/telegraf"
	"github.com/influxdata/telegraf/plugins/parsers/collectd"
	"github.com/influxdata/telegraf/plugins/parsers/dropwizard"
	"github.com/influxdata/telegraf/plugins/parsers/form_urlencoded"
	"github.com/influxdata/telegraf/plugins/parsers/graphite"
	"github.com/influxdata/telegraf/plugins/parsers/grok"
	"github.com/influxdata/telegraf/plugins/parsers/influx"
	"github.com/influxdata/telegraf/plugins/parsers/influx/influx_upstream"
	"github.com/influxdata/telegraf/plugins/parsers/json"
	"github.com/influxdata/telegraf/plugins/parsers/json_v2"
	"github.com/influxdata/telegraf/plugins/parsers/logfmt"
	"github.com/influxdata/telegraf/plugins/parsers/nagios"
	"github.com/influxdata/telegraf/plugins/parsers/prometheus"
	"github.com/influxdata/telegraf/plugins/parsers/prometheusremotewrite"
	"github.com/influxdata/telegraf/plugins/parsers/value"
	"github.com/influxdata/telegraf/plugins/parsers/wavefront"
)

// Creator is the function to create a new parser
type Creator func(defaultMetricName string) telegraf.Parser

// Parsers contains the registry of all known parsers (following the new style)
var Parsers = map[string]Creator{}

// Add adds a parser to the registry. Usually this function is called in the plugin's init function
func Add(name string, creator Creator) {
	Parsers[name] = creator
}

type ParserFunc func() (Parser, error)

// ParserInput is an interface for input plugins that are able to parse
// arbitrary data formats.
type ParserInput interface {
	// SetParser sets the parser function for the interface
	SetParser(parser Parser)
}

// ParserFuncInput is an interface for input plugins that are able to parse
// arbitrary data formats.
type ParserFuncInput interface {
	// SetParserFunc returns a new parser.
	SetParserFunc(fn ParserFunc)
}

// Parser is an interface defining functions that a parser plugin must satisfy.
type Parser interface {
	// Parse takes a byte buffer separated by newlines
	// ie, `cpu.usage.idle 90\ncpu.usage.busy 10`
	// and parses it into telegraf metrics
	//
	// Must be thread-safe.
	Parse(buf []byte) ([]telegraf.Metric, error)

	// ParseLine takes a single string metric
	// ie, "cpu.usage.idle 90"
	// and parses it into a telegraf metric.
	//
	// Must be thread-safe.
	// This function is only called by plugins that expect line based protocols
	// Doesn't need to be implemented by non-linebased parsers (e.g. json, xml)
	ParseLine(line string) (telegraf.Metric, error)

	// SetDefaultTags tells the parser to add all of the given tags
	// to each parsed metric.
	// NOTE: do _not_ modify the map after you've passed it here!!
	SetDefaultTags(tags map[string]string)
}

// ParserCompatibility is an interface for backward-compatible initialization of new parsers
type ParserCompatibility interface {
	// InitFromConfig sets the parser internal variables from the old-style config
	InitFromConfig(config *Config) error
}

// Config is a struct that covers the data types needed for all parser types,
// and can be used to instantiate _any_ of the parsers.
type Config struct {
	// DataFormat can be one of: json, influx, graphite, value, nagios
	DataFormat string `toml:"data_format"`

	// Separator only applied to Graphite data.
	Separator string `toml:"separator"`
	// Templates only apply to Graphite data.
	Templates []string `toml:"templates"`

	// TagKeys only apply to JSON data
	TagKeys []string `toml:"tag_keys"`
	// Array of glob pattern strings keys that should be added as string fields.
	JSONStringFields []string `toml:"json_string_fields"`

	JSONNameKey string `toml:"json_name_key"`
	// MetricName applies to JSON & value. This will be the name of the measurement.
	MetricName string `toml:"metric_name"`

	// holds a gjson path for json parser
	JSONQuery string `toml:"json_query"`

	// key of time
	JSONTimeKey string `toml:"json_time_key"`

	// time format
	JSONTimeFormat string `toml:"json_time_format"`

	// default timezone
	JSONTimezone string `toml:"json_timezone"`

	// Whether to continue if a JSON object can't be coerced
	JSONStrict bool `toml:"json_strict"`

	// Authentication file for collectd
	CollectdAuthFile string `toml:"collectd_auth_file"`
	// One of none (default), sign, or encrypt
	CollectdSecurityLevel string `toml:"collectd_security_level"`
	// Dataset specification for collectd
	CollectdTypesDB []string `toml:"collectd_types_db"`

	// whether to split or join multivalue metrics
	CollectdSplit string `toml:"collectd_split"`

	// DataType only applies to value, this will be the type to parse value to
	DataType string `toml:"data_type"`

	// DefaultTags are the default tags that will be added to all parsed metrics.
	DefaultTags map[string]string `toml:"default_tags"`

	// an optional json path containing the metric registry object
	// if left empty, the whole json object is parsed as a metric registry
	DropwizardMetricRegistryPath string `toml:"dropwizard_metric_registry_path"`
	// an optional json path containing the default time of the metrics
	// if left empty, the processing time is used
	DropwizardTimePath string `toml:"dropwizard_time_path"`
	// time format to use for parsing the time field
	// defaults to time.RFC3339
	DropwizardTimeFormat string `toml:"dropwizard_time_format"`
	// an optional json path pointing to a json object with tag key/value pairs
	// takes precedence over DropwizardTagPathsMap
	DropwizardTagsPath string `toml:"dropwizard_tags_path"`
	// an optional map containing tag names as keys and json paths to retrieve the tag values from as values
	// used if TagsPath is empty or doesn't return any tags
	DropwizardTagPathsMap map[string]string `toml:"dropwizard_tag_paths_map"`

	//grok patterns
	GrokPatterns           []string `toml:"grok_patterns"`
	GrokNamedPatterns      []string `toml:"grok_named_patterns"`
	GrokCustomPatterns     string   `toml:"grok_custom_patterns"`
	GrokCustomPatternFiles []string `toml:"grok_custom_pattern_files"`
	GrokTimezone           string   `toml:"grok_timezone"`
	GrokUniqueTimestamp    string   `toml:"grok_unique_timestamp"`

	//csv configuration
	CSVColumnNames        []string `toml:"csv_column_names"`
	CSVColumnTypes        []string `toml:"csv_column_types"`
	CSVComment            string   `toml:"csv_comment"`
	CSVDelimiter          string   `toml:"csv_delimiter"`
	CSVHeaderRowCount     int      `toml:"csv_header_row_count"`
	CSVMeasurementColumn  string   `toml:"csv_measurement_column"`
	CSVSkipColumns        int      `toml:"csv_skip_columns"`
	CSVSkipRows           int      `toml:"csv_skip_rows"`
	CSVTagColumns         []string `toml:"csv_tag_columns"`
	CSVTimestampColumn    string   `toml:"csv_timestamp_column"`
	CSVTimestampFormat    string   `toml:"csv_timestamp_format"`
	CSVTimezone           string   `toml:"csv_timezone"`
	CSVTrimSpace          bool     `toml:"csv_trim_space"`
	CSVSkipValues         []string `toml:"csv_skip_values"`
	CSVSkipErrors         bool     `toml:"csv_skip_errors"`
	CSVMetadataRows       int      `toml:"csv_metadata_rows"`
	CSVMetadataSeparators []string `toml:"csv_metadata_separators"`
	CSVMetadataTrimSet    string   `toml:"csv_metadata_trim_set"`

	// FormData configuration
	FormUrlencodedTagKeys []string `toml:"form_urlencoded_tag_keys"`

	// Prometheus configuration
	PrometheusIgnoreTimestamp bool `toml:"prometheus_ignore_timestamp"`

	// Value configuration
	ValueFieldName string `toml:"value_field_name"`

	// XPath configuration
	XPathPrintDocument       bool          `toml:"xpath_print_document"`
	XPathProtobufFile        string        `toml:"xpath_protobuf_file"`
	XPathProtobufType        string        `toml:"xpath_protobuf_type"`
	XPathProtobufImportPaths []string      `toml:"xpath_protobuf_import_paths"`
	XPathAllowEmptySelection bool          `toml:"xpath_allow_empty_selection"`
	XPathConfig              []XPathConfig `toml:"xpath"`

	// JSONPath configuration
	JSONV2Config []JSONV2Config `toml:"json_v2"`

	// Influx configuration
	InfluxParserType string `toml:"influx_parser_type"`

	// LogFmt configuration
	LogFmtTagKeys []string `toml:"logfmt_tag_keys"`
}

// XPathConfig definition for backward compatibitlity ONLY.
// We need this here to avoid cyclic dependencies. However, we need
// to move this to plugins/parsers/xpath once we deprecate parser
// construction via `NewParser()`.
type XPathConfig struct {
	MetricQuery  string            `toml:"metric_name"`
	Selection    string            `toml:"metric_selection"`
	Timestamp    string            `toml:"timestamp"`
	TimestampFmt string            `toml:"timestamp_format"`
	Tags         map[string]string `toml:"tags"`
	Fields       map[string]string `toml:"fields"`
	FieldsInt    map[string]string `toml:"fields_int"`

	FieldSelection  string `toml:"field_selection"`
	FieldNameQuery  string `toml:"field_name"`
	FieldValueQuery string `toml:"field_value"`
	FieldNameExpand bool   `toml:"field_name_expansion"`

	TagSelection  string `toml:"tag_selection"`
	TagNameQuery  string `toml:"tag_name"`
	TagValueQuery string `toml:"tag_value"`
	TagNameExpand bool   `toml:"tag_name_expansion"`
}

type JSONV2Config struct {
	json_v2.Config
}

// NewParser returns a Parser interface based on the given config.
func NewParser(config *Config) (Parser, error) {
	var err error
	var parser Parser
	switch config.DataFormat {
	case "json":
		parser, err = json.New(
			&json.Config{
				MetricName:   config.MetricName,
				TagKeys:      config.TagKeys,
				NameKey:      config.JSONNameKey,
				StringFields: config.JSONStringFields,
				Query:        config.JSONQuery,
				TimeKey:      config.JSONTimeKey,
				TimeFormat:   config.JSONTimeFormat,
				Timezone:     config.JSONTimezone,
				DefaultTags:  config.DefaultTags,
				Strict:       config.JSONStrict,
			},
		)
	case "value":
		parser, err = NewValueParser(config.MetricName,
			config.DataType, config.ValueFieldName, config.DefaultTags)
	case "influx":
		if config.InfluxParserType == "upstream" {
			parser, err = NewInfluxUpstreamParser()
		} else {
			parser, err = NewInfluxParser()
		}
	case "nagios":
		parser, err = NewNagiosParser()
	case "graphite":
		parser, err = NewGraphiteParser(config.Separator,
			config.Templates, config.DefaultTags)
	case "collectd":
		parser, err = NewCollectdParser(config.CollectdAuthFile,
			config.CollectdSecurityLevel, config.CollectdTypesDB, config.CollectdSplit)
	case "dropwizard":
		parser, err = NewDropwizardParser(
			config.DropwizardMetricRegistryPath,
			config.DropwizardTimePath,
			config.DropwizardTimeFormat,
			config.DropwizardTagsPath,
			config.DropwizardTagPathsMap,
			config.DefaultTags,
			config.Separator,
			config.Templates)
	case "wavefront":
		parser, err = NewWavefrontParser(config.DefaultTags)
	case "grok":
		parser, err = newGrokParser(
			config.MetricName,
			config.GrokPatterns,
			config.GrokNamedPatterns,
			config.GrokCustomPatterns,
			config.GrokCustomPatternFiles,
			config.GrokTimezone,
			config.GrokUniqueTimestamp)
	case "logfmt":
		parser, err = NewLogFmtParser(config.MetricName, config.DefaultTags, config.LogFmtTagKeys)
	case "form_urlencoded":
		parser, err = NewFormUrlencodedParser(
			config.MetricName,
			config.DefaultTags,
			config.FormUrlencodedTagKeys,
		)
	case "prometheus":
		parser, err = NewPrometheusParser(
			config.DefaultTags,
			config.PrometheusIgnoreTimestamp,
		)
	case "prometheusremotewrite":
		parser, err = NewPrometheusRemoteWriteParser(config.DefaultTags)
	case "json_v2":
		parser, err = NewJSONPathParser(config.JSONV2Config)
	default:
		creator, found := Parsers[config.DataFormat]
		if !found {
			return nil, fmt.Errorf("invalid data format: %s", config.DataFormat)
		}

		// Try to create new-style parsers the old way...
		// DEPRECATED: Please instantiate the parser directly instead of using this function.
		parser = creator(config.MetricName)
		p, ok := parser.(ParserCompatibility)
		if !ok {
			return nil, fmt.Errorf("parser for %q cannot be created the old way", config.DataFormat)
		}
		err = p.InitFromConfig(config)
	}
	return parser, err
}

func newGrokParser(metricName string,
	patterns []string, nPatterns []string,
	cPatterns string, cPatternFiles []string,
	tZone string, uniqueTimestamp string) (Parser, error) {
	parser := grok.Parser{
		Measurement:        metricName,
		Patterns:           patterns,
		NamedPatterns:      nPatterns,
		CustomPatterns:     cPatterns,
		CustomPatternFiles: cPatternFiles,
		Timezone:           tZone,
		UniqueTimestamp:    uniqueTimestamp,
	}

	err := parser.Compile()
	return &parser, err
}

func NewNagiosParser() (Parser, error) {
	return &nagios.NagiosParser{}, nil
}

func NewInfluxParser() (Parser, error) {
	handler := influx.NewMetricHandler()
	return influx.NewParser(handler), nil
}

func NewInfluxUpstreamParser() (Parser, error) {
	return influx_upstream.NewParser(), nil
}

func NewGraphiteParser(
	separator string,
	templates []string,
	defaultTags map[string]string,
) (Parser, error) {
	return graphite.NewGraphiteParser(separator, templates, defaultTags)
}

func NewValueParser(
	metricName string,
	dataType string,
	fieldName string,
	defaultTags map[string]string,
) (Parser, error) {
	return value.NewValueParser(metricName, dataType, fieldName, defaultTags), nil
}

func NewCollectdParser(
	authFile string,
	securityLevel string,
	typesDB []string,
	split string,
) (Parser, error) {
	return collectd.NewCollectdParser(authFile, securityLevel, typesDB, split)
}

func NewDropwizardParser(
	metricRegistryPath string,
	timePath string,
	timeFormat string,
	tagsPath string,
	tagPathsMap map[string]string,
	defaultTags map[string]string,
	separator string,
	templates []string,

) (Parser, error) {
	parser := dropwizard.NewParser()
	parser.MetricRegistryPath = metricRegistryPath
	parser.TimePath = timePath
	parser.TimeFormat = timeFormat
	parser.TagsPath = tagsPath
	parser.TagPathsMap = tagPathsMap
	parser.DefaultTags = defaultTags
	err := parser.SetTemplates(separator, templates)
	if err != nil {
		return nil, err
	}
	return parser, err
}

// NewLogFmtParser returns a logfmt parser with the default options.
func NewLogFmtParser(metricName string, defaultTags map[string]string, tagKeys []string) (Parser, error) {
	parser := logfmt.NewParser(metricName, defaultTags, tagKeys)
	err := parser.Init()
	return parser, err
}

func NewWavefrontParser(defaultTags map[string]string) (Parser, error) {
	return wavefront.NewWavefrontParser(defaultTags), nil
}

func NewFormUrlencodedParser(
	metricName string,
	defaultTags map[string]string,
	tagKeys []string,
) (Parser, error) {
	return &form_urlencoded.Parser{
		MetricName:  metricName,
		DefaultTags: defaultTags,
		TagKeys:     tagKeys,
	}, nil
}

func NewPrometheusParser(defaultTags map[string]string, ignoreTimestamp bool) (Parser, error) {
	return &prometheus.Parser{
		DefaultTags:     defaultTags,
		IgnoreTimestamp: ignoreTimestamp,
	}, nil
}

func NewPrometheusRemoteWriteParser(defaultTags map[string]string) (Parser, error) {
	return &prometheusremotewrite.Parser{
		DefaultTags: defaultTags,
	}, nil
}

func NewJSONPathParser(jsonv2config []JSONV2Config) (Parser, error) {
	configs := make([]json_v2.Config, len(jsonv2config))
	for i, cfg := range jsonv2config {
		configs[i].MeasurementName = cfg.MeasurementName
		configs[i].MeasurementNamePath = cfg.MeasurementNamePath

		configs[i].TimestampPath = cfg.TimestampPath
		configs[i].TimestampFormat = cfg.TimestampFormat
		configs[i].TimestampTimezone = cfg.TimestampTimezone

		configs[i].Fields = cfg.Fields
		configs[i].Tags = cfg.Tags

		configs[i].JSONObjects = cfg.JSONObjects
	}
	return &json_v2.Parser{
		Configs: configs,
	}, nil
}
