package inspurlegacy

import (
	"regexp"
	"strings"
	"time"

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

const megaraidTimeLayout = "1/2/2006 15:04:05"

var megaraidDescWarning = []string{
	"medium error", "unexpected sense", "error on pd", "patrol read", "puncturing",
	"rebuild", "copyback", "reassign",
}
var megaraidDescCritical = []string{
	"failed", "offline", "predictive failure", "not responding", "removed",
	"degraded", "punctured", "bad block",
}

var megaraidSeqRe = regexp.MustCompile(`^(?:Event Sequence Number|r)\s*:\s*(\d+)`)

// ParseMegaRAIDLog parses a MegaRAID controller event log (raid0.log). Records
// are separated by blank lines; each carries "Timestamp : M/D/YYYY ; HH:MM:SS",
// a Class, and a "Description of the event" line.
func ParseMegaRAIDLog(content []byte, source string) []models.Event {
	var events []models.Event
	var cur map[string]string
	flush := func() {
		if cur == nil {
			return
		}
		if e, ok := megaraidEvent(cur, source); ok {
			events = append(events, e)
		}
		cur = nil
	}

	for _, line := range strings.Split(string(content), "\n") {
		line = strings.TrimRight(line, "\r")
		trimmed := strings.TrimSpace(line)
		if trimmed == "" {
			flush()
			continue
		}
		if megaraidSeqRe.MatchString(trimmed) {
			flush()
			cur = make(map[string]string)
		}
		if cur == nil {
			cur = make(map[string]string)
		}
		k, v, ok := strings.Cut(trimmed, ":")
		if !ok {
			continue
		}
		key := strings.TrimSpace(k)
		if _, exists := cur[key]; !exists {
			cur[key] = strings.TrimSpace(v)
		}
	}
	flush()
	return events
}

func megaraidEvent(m map[string]string, source string) (models.Event, bool) {
	desc := m["Description of the event"]
	if desc == "" {
		return models.Event{}, false
	}
	ts, ok := parseMegaRAIDTimestamp(m["Timestamp"])
	if !ok || bogusYear(ts) {
		return models.Event{}, false
	}

	severity := severityFromWord(m["Class"])
	low := strings.ToLower(desc)
	for _, p := range megaraidDescCritical {
		if strings.Contains(low, p) {
			severity = models.SeverityCritical
		}
	}
	if severity == models.SeverityInfo {
		for _, p := range megaraidDescWarning {
			if strings.Contains(low, p) {
				severity = models.SeverityWarning
			}
		}
	}

	seq := m["Event Sequence Number"]
	if seq == "" {
		seq = m["r"]
	}
	return models.Event{
		ID:          "megaraid_" + source + "_" + seq,
		Timestamp:   ts,
		Source:      "RAID/" + strings.TrimSuffix(source, ".log"),
		SensorType:  "raid",
		SensorName:  strings.TrimSpace(m["Locale"]),
		EventType:   strings.TrimSpace(m["Event code"]),
		Severity:    severity,
		Description: desc,
	}, true
}

// parseMegaRAIDTimestamp accepts "M/D/YYYY ; HH:MM:SS". Non-wall-clock forms
// ("... Seconds", "Not Present") are rejected.
func parseMegaRAIDTimestamp(s string) (time.Time, bool) {
	s = strings.TrimSpace(s)
	if !strings.Contains(s, ";") {
		return time.Time{}, false
	}
	parts := strings.SplitN(s, ";", 2)
	datePart := strings.TrimSpace(parts[0])
	timePart := strings.TrimSpace(parts[1])
	ts, err := time.Parse(megaraidTimeLayout, datePart+" "+timePart)
	if err != nil {
		return time.Time{}, false
	}
	return ts, true
}