// Package inspurlegacy parses the legacy Inspur "onekeylog" BMC diagnostic
// archive produced by older AMI-based Inspur BMCs (e.g. NF5466M5 / NF5280M5
// generation). That format predates the Kaytus-style onekeylog handled by the
// internal/parser/vendors/inspur package: it has no asset.json, no
// devicefrusdr.log, no selelist.csv and no component.log. Instead hardware
// inventory lives in Inspur_AssetInfoInventory.log, FRU data in a binary
// FRU.bin, the event log in an Inspur_<model>_<serial>_IDL text file plus a
// pipe-delimited sel.log, and BMC syslog in flat <sev>.log files at the archive
// root.
//
// IMPORTANT: bump parserVersion on any behavior change (see module-versioning).
package inspurlegacy

import (
	"strings"

	"git.mchus.pro/mchus/logpile/internal/models"
	"git.mchus.pro/mchus/logpile/internal/parser"
)

// parserVersion follows the N.M module-versioning scheme.
const parserVersion = "1.0"

func init() {
	parser.Register(&Parser{})
}

// Parser implements parser.VendorParser for the legacy Inspur onekeylog format.
type Parser struct{}

// Name returns a human-readable parser name.
func (p *Parser) Name() string { return "Inspur Legacy onekeylog BMC Parser" }

// Vendor returns the parser identifier.
func (p *Parser) Vendor() string { return "inspur_legacy" }

// Version returns the parser module version.
func (p *Parser) Version() string { return parserVersion }

// DetectPriority makes this parser win a confidence tie against the broader
// Kaytus-style Inspur parser, which also matches anything under onekeylog/.
func (p *Parser) DetectPriority() int { return 10 }

// modernMarkers are files that only appear in the newer Kaytus-style onekeylog.
// Their presence means the other Inspur parser should handle the archive.
var modernMarkers = []string{
	"asset.json",
	"devicefrusdr.log",
	"selelist.csv",
	"component.log",
	"onekeylog_dreport.log",
}

// Detect returns a confidence score for the legacy onekeylog format.
func (p *Parser) Detect(files []parser.ExtractedFile) int {
	confidence := 0
	for _, f := range files {
		base := strings.ToLower(baseName(f.Path))
		for _, m := range modernMarkers {
			if base == m {
				return 0
			}
		}

		switch {
		case base == "inspur_assetinfoinventory.log":
			confidence += 40
		case isLegacyIDLName(base):
			confidence += 30
		case base == "fru.bin":
			confidence += 15
		case base == "blackbox.log":
			confidence += 10
		case base == "eepromdata.log":
			confidence += 10
		case base == "sdr.dat":
			confidence += 10
		case base == "sadtadreg.dat":
			confidence += 5
		}
	}

	if confidence > 100 {
		return 100
	}
	return confidence
}

// Parse extracts events, FRU and hardware inventory from a legacy onekeylog.
func (p *Parser) Parse(files []parser.ExtractedFile) (*models.AnalysisResult, error) {
	result := &models.AnalysisResult{
		Events:  make([]models.Event, 0),
		FRU:     make([]models.FRUInfo, 0),
		Sensors: make([]models.SensorReading, 0),
	}
	hw := &models.HardwareConfig{}
	result.Hardware = hw

	if f := parser.FindFileByName(files, "FRU.bin"); f != nil {
		if fru, ok := DecodeBinaryFRU(f.Content); ok {
			result.FRU = append(result.FRU, fru.toFRUInfo())
			fru.applyToBoardInfo(&hw.BoardInfo)
		}
	}

	if f := parser.FindFileByName(files, "Inspur_AssetInfoInventory.log"); f != nil {
		ParseAssetInfoInventory(f.Content, hw)
	}

	// Event sources, most structured first.
	for _, f := range findLegacyIDLFiles(files) {
		result.Events = append(result.Events, ParseIDLEvents(f.Content)...)
	}
	if f := parser.FindFileByName(files, "sel.log"); f != nil {
		result.Events = append(result.Events, ParseSELLog(f.Content)...)
	}
	if f := parser.FindFileByName(files, "blackbox.log"); f != nil {
		result.Events = append(result.Events, ParseBlackbox(f.Content)...)
	}
	for _, f := range findRAIDLogFiles(files) {
		result.Events = append(result.Events, ParseMegaRAIDLog(f.Content, baseName(f.Path))...)
	}
	for _, f := range findSyslogFiles(files) {
		result.Events = append(result.Events, ParseAMISyslog(f.Content, baseName(f.Path))...)
	}

	result.Events = dedupeEvents(result.Events)
	sortEvents(result.Events)

	// This archive class carries no live sensor readings: SDR.dat holds only
	// sensor definitions, and there is no "sensor list" capture. Record why the
	// sensor set is empty instead of leaving it silently unexplained.
	result.CollectionErrors = append(result.CollectionErrors, models.CollectionError{
		Section: "sensors",
		Message: "legacy onekeylog carries no live sensor readings (SDR.dat holds definitions only, no sensor-list capture)",
	})

	return result, nil
}

func baseName(path string) string {
	path = strings.ReplaceAll(path, "\\", "/")
	if i := strings.LastIndex(path, "/"); i >= 0 {
		return path[i+1:]
	}
	return path
}

// isLegacyIDLName matches the "Inspur_<model>_<serial>_IDL" event-log filename
// (no extension), lower-cased.
func isLegacyIDLName(base string) bool {
	return strings.HasPrefix(base, "inspur_") && strings.HasSuffix(base, "_idl")
}

func findLegacyIDLFiles(files []parser.ExtractedFile) []parser.ExtractedFile {
	var out []parser.ExtractedFile
	for _, f := range files {
		if isLegacyIDLName(strings.ToLower(baseName(f.Path))) {
			out = append(out, f)
		}
	}
	return out
}

func findRAIDLogFiles(files []parser.ExtractedFile) []parser.ExtractedFile {
	var out []parser.ExtractedFile
	for _, f := range files {
		base := strings.ToLower(baseName(f.Path))
		if strings.HasPrefix(base, "raid") && strings.HasSuffix(base, ".log") {
			out = append(out, f)
		}
	}
	return out
}

// syslogFileNames are the flat AMI BMC severity logs at the archive root that
// carry fault-relevant records. debug.log and audit.log are intentionally left
// out: they are high-volume housekeeping noise, not diagnostics.
var syslogFileNames = map[string]struct{}{
	"emerg.log": {}, "alert.log": {}, "crit.log": {}, "err.log": {}, "warning.log": {},
}

func findSyslogFiles(files []parser.ExtractedFile) []parser.ExtractedFile {
	var out []parser.ExtractedFile
	for _, f := range files {
		if _, ok := syslogFileNames[strings.ToLower(baseName(f.Path))]; ok {
			out = append(out, f)
		}
	}
	return out
}