package inspur

import (
	"bufio"
	"regexp"
	"strings"

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

var (
	fruDeviceRegex  = regexp.MustCompile(`^FRU Device Description\s*:\s*(.+)$`)
	fruFieldRegex   = regexp.MustCompile(`^\s+(.+?)\s*:\s*(.*)$`)
	platformIdRegex = regexp.MustCompile(`(?i)PlatformId\s*=\s*(\S+)`)
)

// ParseFRU parses BMC FRU (Field Replaceable Unit) output
func ParseFRU(content []byte) []models.FRUInfo {
	var fruList []models.FRUInfo
	var current *models.FRUInfo

	scanner := bufio.NewScanner(strings.NewReader(string(content)))
	for scanner.Scan() {
		line := scanner.Text()

		// Check for new FRU device
		if matches := fruDeviceRegex.FindStringSubmatch(line); matches != nil {
			if current != nil && current.Description != "" {
				fruList = append(fruList, *current)
			}
			current = &models.FRUInfo{
				Description: strings.TrimSpace(matches[1]),
			}
			continue
		}

		// Skip if no current FRU device
		if current == nil {
			continue
		}

		// Skip "Device not present" entries
		if strings.Contains(line, "Device not present") {
			current = nil
			continue
		}

		// Parse FRU fields
		if matches := fruFieldRegex.FindStringSubmatch(line); matches != nil {
			fieldName := strings.TrimSpace(matches[1])
			fieldValue := strings.TrimSpace(matches[2])

			switch fieldName {
			case "Chassis Type":
				current.ChassisType = fieldValue
			case "Chassis Part Number":
				if fieldValue != "0" {
					current.PartNumber = fieldValue
				}
			case "Chassis Serial":
				if fieldValue != "0" {
					current.SerialNumber = fieldValue
				}
			case "Board Mfg Date":
				current.MfgDate = fieldValue
			case "Board Mfg", "Product Manufacturer":
				if fieldValue != "NULL" {
					current.Manufacturer = fieldValue
				}
			case "Board Product", "Product Name":
				if fieldValue != "NULL" {
					current.ProductName = fieldValue
				}
			case "Board Serial", "Product Serial":
				current.SerialNumber = fieldValue
			case "Board Part Number", "Product Part Number":
				if fieldValue != "0" {
					current.PartNumber = fieldValue
				}
			case "Product Version":
				if fieldValue != "0" {
					current.Version = fieldValue
				}
			case "Product Asset Tag":
				if fieldValue != "NULL" {
					current.AssetTag = fieldValue
				}
			}
		}
	}

	// Don't forget the last one
	if current != nil && current.Description != "" {
		fruList = append(fruList, *current)
	}

	return fruList
}

// extractBoardInfo extracts main board/chassis information from FRU data
func extractBoardInfo(fruList []models.FRUInfo, hw *models.HardwareConfig) {
	if hw == nil || len(fruList) == 0 {
		return
	}

	// Look for the main board/chassis FRU entry.
	// Keep the first non-empty serial as the server serial and avoid overwriting it
	// with module-specific serials (e.g., SCM_FRU).
	for _, fru := range fruList {
		// Skip empty entries
		if fru.ProductName == "" && fru.SerialNumber == "" {
			continue
		}

		// Prioritize entries that look like main board info
		desc := strings.ToLower(fru.Description)
		isMainBoard := strings.Contains(desc, "builtin") ||
			strings.Contains(desc, "fru device") ||
			strings.Contains(desc, "chassis") ||
			strings.Contains(desc, "board")

		if fru.SerialNumber != "" && hw.BoardInfo.SerialNumber == "" {
			hw.BoardInfo.SerialNumber = fru.SerialNumber
		}
		if fru.ProductName != "" && (hw.BoardInfo.ProductName == "" || isMainBoard) {
			hw.BoardInfo.ProductName = fru.ProductName
		}
		// Manufacturer from non-main FRU entries (e.g. PSU vendor) should not become server vendor.
		if fru.Manufacturer != "" && isMainBoard && hw.BoardInfo.Manufacturer == "" {
			hw.BoardInfo.Manufacturer = fru.Manufacturer
		}
		if fru.PartNumber != "" && (hw.BoardInfo.PartNumber == "" || isMainBoard) {
			hw.BoardInfo.PartNumber = fru.PartNumber
		}

		// Main board entry with complete data is good enough to stop.
		if isMainBoard && hw.BoardInfo.ProductName != "" && hw.BoardInfo.SerialNumber != "" {
			break
		}
	}
}

// extractPlatformId extracts server model from ThermalConfig (PlatformId)
func extractPlatformId(content []byte, hw *models.HardwareConfig) {
	if hw == nil {
		return
	}

	if match := platformIdRegex.FindSubmatch(content); match != nil {
		platformId := strings.TrimSpace(string(match[1]))
		if platformId != "" {
			// Set as ProductName (server model) - this takes priority over FRU data
			hw.BoardInfo.ProductName = platformId
			// Also set manufacturer as Inspur if not already set
			if hw.BoardInfo.Manufacturer == "" {
				hw.BoardInfo.Manufacturer = "Inspur"
			}
		}
	}
}