package platform

import (
	"encoding/json"
	"os"
	"os/exec"
	"path/filepath"
	"sort"
	"strings"
)

var techDumpFixedCommands = []struct {
	Name string
	Args []string
	File string
}{
	{Name: "dmidecode", Args: []string{"-t", "0"}, File: "dmidecode-type0.txt"},
	{Name: "dmidecode", Args: []string{"-t", "1"}, File: "dmidecode-type1.txt"},
	{Name: "dmidecode", Args: []string{"-t", "2"}, File: "dmidecode-type2.txt"},
	{Name: "dmidecode", Args: []string{"-t", "4"}, File: "dmidecode-type4.txt"},
	{Name: "dmidecode", Args: []string{"-t", "17"}, File: "dmidecode-type17.txt"},
	{Name: "lspci", Args: []string{"-vmm", "-D"}, File: "lspci-vmm.txt"},
	{Name: "lsblk", Args: []string{"-J", "-d", "-o", "NAME,TYPE,SIZE,SERIAL,MODEL,TRAN,HCTL"}, File: "lsblk.json"},
	{Name: "sensors", Args: []string{"-j"}, File: "sensors.json"},
	{Name: "ipmitool", Args: []string{"fru", "print"}, File: "ipmitool-fru.txt"},
	{Name: "ipmitool", Args: []string{"sdr"}, File: "ipmitool-sdr.txt"},
	{Name: "nvidia-smi", Args: []string{"-q"}, File: "nvidia-smi-q.txt"},
	{Name: "nvidia-smi", Args: []string{"--query-gpu=index,pci.bus_id,serial,vbios_version,temperature.gpu,power.draw,ecc.errors.uncorrected.aggregate.total,ecc.errors.corrected.aggregate.total,clocks_throttle_reasons.hw_slowdown", "--format=csv,noheader,nounits"}, File: "nvidia-smi-query.csv"},
	{Name: "nvme", Args: []string{"list", "-o", "json"}, File: "nvme-list.json"},
}

type lsblkDumpRoot struct {
	Blockdevices []struct {
		Name string `json:"name"`
		Type string `json:"type"`
	} `json:"blockdevices"`
}

type nvmeDumpRoot struct {
	Devices []struct {
		DevicePath string `json:"DevicePath"`
	} `json:"Devices"`
}

func (s *System) CaptureTechnicalDump(baseDir string) error {
	if err := os.MkdirAll(baseDir, 0755); err != nil {
		return err
	}

	for _, cmd := range techDumpFixedCommands {
		writeCommandDump(filepath.Join(baseDir, cmd.File), cmd.Name, cmd.Args...)
	}

	for _, dev := range lsblkDumpDevices(filepath.Join(baseDir, "lsblk.json")) {
		writeCommandDump(filepath.Join(baseDir, "smartctl-"+sanitizeDumpName(dev)+".json"), "smartctl", "-j", "-a", "/dev/"+dev)
	}
	for _, dev := range nvmeDumpDevices(filepath.Join(baseDir, "nvme-list.json")) {
		writeCommandDump(filepath.Join(baseDir, "nvme-id-ctrl-"+sanitizeDumpName(dev)+".json"), "nvme", "id-ctrl", dev, "-o", "json")
		writeCommandDump(filepath.Join(baseDir, "nvme-smart-log-"+sanitizeDumpName(dev)+".json"), "nvme", "smart-log", dev, "-o", "json")
	}
	return nil
}

func writeCommandDump(path, name string, args ...string) {
	out, err := exec.Command(name, args...).CombinedOutput()
	if err != nil && len(out) == 0 {
		return
	}
	_ = os.WriteFile(path, out, 0644)
}

func lsblkDumpDevices(path string) []string {
	raw, err := os.ReadFile(path)
	if err != nil {
		return nil
	}
	var root lsblkDumpRoot
	if err := json.Unmarshal(raw, &root); err != nil {
		return nil
	}
	var devices []string
	for _, dev := range root.Blockdevices {
		if dev.Type == "disk" && strings.TrimSpace(dev.Name) != "" {
			devices = append(devices, strings.TrimSpace(dev.Name))
		}
	}
	sort.Strings(devices)
	return devices
}

func nvmeDumpDevices(path string) []string {
	raw, err := os.ReadFile(path)
	if err != nil {
		return nil
	}
	var root nvmeDumpRoot
	if err := json.Unmarshal(raw, &root); err != nil {
		return nil
	}
	seen := map[string]bool{}
	var devices []string
	for _, dev := range root.Devices {
		name := strings.TrimSpace(dev.DevicePath)
		if name == "" || seen[name] {
			continue
		}
		seen[name] = true
		devices = append(devices, name)
	}
	sort.Strings(devices)
	return devices
}

func sanitizeDumpName(value string) string {
	value = strings.TrimSpace(value)
	value = strings.TrimPrefix(value, "/dev/")
	value = strings.ReplaceAll(value, "/", "_")
	if value == "" {
		return "unknown"
	}
	return value
}