package inspur

import (
	"encoding/json"
	"regexp"
	"strings"

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

// componentLogFRURegex isolates the JSON array that follows "RESTful FRU info:"
// in a combined component.log. FRU areas carry no nested arrays, so the lazy
// match stops at the array's own closing bracket.
var componentLogFRURegex = regexp.MustCompile(`RESTful FRU info:\s*(\[[\s\S]*?\])`)

type componentFRUArea struct {
	Version      int    `json:"version"`
	Type         string `json:"type"`
	Date         string `json:"date"`
	Manufacturer string `json:"manufacturer"`
	ProductName  string `json:"product_name"`
	SerialNumber string `json:"serial_number"`
	PartNumber   string `json:"part_number"`
	AssetTag     string `json:"asset_tag"`
}

type componentFRUDevice struct {
	Device struct {
		ID         int    `json:"id"`
		Name       string `json:"name"`
		SystemUUID string `json:"system_uuid"`
	} `json:"device"`
	Chassis componentFRUArea `json:"chassis"`
	Board   componentFRUArea `json:"board"`
	Product componentFRUArea `json:"product"`
}

// ParseComponentLogFRU parses the "RESTful FRU info:" JSON block from a combined
// component.log. Some onekeylog dumps ship this block instead of a
// devicefrusdr.log / asset.json, so it is the only source of board manufacturer,
// product name, part number and system UUID for that dump class. It also sets
// hw.BoardInfo.UUID directly, which extractBoardInfo does not populate.
func ParseComponentLogFRU(content []byte, hw *models.HardwareConfig) []models.FRUInfo {
	m := componentLogFRURegex.FindSubmatch(content)
	if m == nil {
		return nil
	}

	var devices []componentFRUDevice
	if err := json.Unmarshal(m[1], &devices); err != nil {
		return nil
	}

	var out []models.FRUInfo
	for _, d := range devices {
		fru := componentFRUToModel(d)
		if fru.Manufacturer == "" && fru.ProductName == "" && fru.SerialNumber == "" && fru.PartNumber == "" {
			continue
		}
		out = append(out, fru)

		if hw != nil && hw.BoardInfo.UUID == "" && isSystemFRUDevice(d.Device.Name) {
			if u := fruAreaValue(d.Device.SystemUUID); u != "" {
				hw.BoardInfo.UUID = u
			}
		}
	}
	return out
}

func isSystemFRUDevice(name string) bool {
	n := strings.ToUpper(strings.TrimSpace(name))
	return n == "BMC_FRU" || n == "MB_FRU" || strings.HasPrefix(n, "MAINBOARD")
}

// componentFRUToModel flattens a FRU device into one models.FRUInfo. The product
// area (system serial / asset tag the operator knows, e.g. "24C319579") is
// preferred over the board area (physical PCB serial) for identity, matching the
// BEE-SP live-CD inventory and the Reanimator board contract.
func componentFRUToModel(d componentFRUDevice) models.FRUInfo {
	desc := strings.TrimSpace(d.Device.Name)
	if desc == "" {
		desc = "FRU Device"
	}
	// extractBoardInfo only lifts manufacturer from an entry it recognises as the
	// main board; tag the system FRU so it does.
	if isSystemFRUDevice(d.Device.Name) {
		desc += " (builtin board)"
	}

	return models.FRUInfo{
		Description:  desc,
		ChassisType:  fruAreaValue(d.Chassis.Type),
		Manufacturer: fruAreaValue(d.Product.Manufacturer, d.Board.Manufacturer),
		ProductName:  fruAreaValue(d.Product.ProductName, d.Board.ProductName),
		SerialNumber: fruAreaValue(d.Product.SerialNumber, d.Board.SerialNumber),
		PartNumber:   fruAreaValue(d.Product.PartNumber, d.Board.PartNumber, d.Chassis.PartNumber),
		MfgDate:      fruAreaValue(d.Board.Date),
		AssetTag:     fruAreaValue(d.Product.AssetTag),
	}
}

// fruAreaValue returns the first argument that is a real value. iBMC uses "0",
// "NULL" and whitespace-padded blanks as placeholders in unused FRU areas.
func fruAreaValue(values ...string) string {
	for _, v := range values {
		t := strings.TrimSpace(v)
		if t == "" || t == "0" || strings.EqualFold(t, "null") || strings.EqualFold(t, "n/a") {
			continue
		}
		return t
	}
	return ""
}