package nvidia_bug_report

import (
	"bufio"
	"regexp"
	"strconv"
	"strings"
	"time"

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

// parseGPUInfo extracts GPU information from the bug report
func parseGPUInfo(content string, result *models.AnalysisResult) {
	scanner := bufio.NewScanner(strings.NewReader(content))

	var currentGPU *models.GPU
	inGPUInfo := false

	for scanner.Scan() {
		line := scanner.Text()

		// Look for GPU information section markers (but skip ls listings)
		if strings.Contains(line, "/proc/driver/nvidia") && strings.Contains(line, "/gpus/") &&
		   strings.Contains(line, "/information") && !strings.Contains(line, "ls:") {
			// Extract PCI address
			re := regexp.MustCompile(`/gpus/([\da-f]{4}:[\da-f]{2}:[\da-f]{2}\.[\da-f])`)
			matches := re.FindStringSubmatch(line)
			if len(matches) > 1 {
				pciAddr := matches[1]

				// Save previous GPU if exists
				if currentGPU != nil {
					result.Hardware.GPUs = append(result.Hardware.GPUs, *currentGPU)
				}

				// Start new GPU entry
				currentGPU = &models.GPU{
					BDF:          pciAddr,
					Manufacturer: "NVIDIA",
				}
				inGPUInfo = true
				continue
			}
		}

		// End of GPU info section (separator line or new section, but not ls lines)
		if inGPUInfo && (strings.HasPrefix(line, "___") || (strings.HasPrefix(line, "***") && !strings.Contains(line, "ls:"))) {
			inGPUInfo = false
			continue
		}

		// Parse GPU fields within information section
		if inGPUInfo && currentGPU != nil && strings.Contains(line, ":") {
			// Split on first colon and trim whitespace/tabs
			parts := strings.SplitN(line, ":", 2)
			if len(parts) != 2 {
				continue
			}

			field := strings.TrimSpace(parts[0])
			value := strings.TrimSpace(parts[1])

			if value == "" {
				continue
			}

			switch field {
			case "Model":
				currentGPU.Model = value
			case "IRQ":
				if irq, err := strconv.Atoi(value); err == nil {
					currentGPU.IRQ = irq
				}
			case "GPU UUID":
				currentGPU.UUID = value
			case "Video BIOS":
				currentGPU.VideoBIOS = value
			case "Bus Type":
				currentGPU.BusType = value
			case "DMA Size":
				currentGPU.DMASize = value
			case "DMA Mask":
				currentGPU.DMAMask = value
			case "Bus Location":
				// BDF already set from path, but verify consistency
				if currentGPU.BDF != value {
					// Use the value from the information section as it's more explicit
					currentGPU.BDF = value
				}
			case "Device Minor":
				if minor, err := strconv.Atoi(value); err == nil {
					currentGPU.DeviceMinor = minor
				}
			case "GPU Excluded":
				// Store as status if "Yes"
				if strings.ToLower(value) == "yes" {
					currentGPU.Status = "Excluded"
				}
			}
		}
	}

	// Save last GPU if exists
	if currentGPU != nil {
		result.Hardware.GPUs = append(result.Hardware.GPUs, *currentGPU)
	}

	// Create event for GPU summary
	if len(result.Hardware.GPUs) > 0 {
		result.Events = append(result.Events, models.Event{
			Timestamp:   time.Now(),
			Source:      "NVIDIA Driver",
			EventType:   "GPU Detection",
			Description: "NVIDIA GPUs detected",
			Severity:    models.SeverityInfo,
			RawData:     formatGPUSummary(result.Hardware.GPUs),
		})
	}
}

// parseDriverVersion extracts NVIDIA driver version
func parseDriverVersion(content string, result *models.AnalysisResult) {
	scanner := bufio.NewScanner(strings.NewReader(content))

	for scanner.Scan() {
		line := scanner.Text()

		// Look for NVRM version line
		if strings.Contains(line, "NVRM version:") {
			// Extract version info
			parts := strings.Split(line, "NVRM version:")
			if len(parts) > 1 {
				version := strings.TrimSpace(parts[1])

				result.Events = append(result.Events, models.Event{
					Timestamp:   time.Now(),
					Source:      "NVIDIA Driver",
					EventType:   "Driver Version",
					Description: "NVIDIA driver version detected",
					Severity:    models.SeverityInfo,
					RawData:     version,
				})
				break
			}
		}
	}
}

// formatGPUSummary creates a summary string for GPUs
func formatGPUSummary(gpus []models.GPU) string {
	if len(gpus) == 0 {
		return ""
	}

	var summary strings.Builder
	for i, gpu := range gpus {
		if i > 0 {
			summary.WriteString("; ")
		}
		summary.WriteString(gpu.BDF)
		if gpu.Model != "" {
			summary.WriteString(" (")
			summary.WriteString(gpu.Model)
			summary.WriteString(")")
		}
	}

	return summary.String()
}