package app

import (
	"os"
	"path/filepath"
	"strings"
)

// DefaultMetricsDBPath is the SQLite time-series metrics store, kept outside
// DefaultExportDir (unlike everything else this package copies into a
// support bundle / blackbox mirror) because it's a live, actively-written
// database rather than a point-in-time capture.
const DefaultMetricsDBPath = "/appdata/bee/metrics.db"

// techdumpBucketFor maps a filename produced by platform.CaptureTechnicalDump
// into export/techdump/ to its device-type bucket under export/ in the
// categorized bundle layout, so a vendor engineer can find "the GPU stuff"
// without knowing bee's internal file names.
func techdumpBucketFor(name string) string {
	switch {
	case name == "lscpu.txt", name == "dmidecode-type4.txt":
		return "cpu"
	case name == "dmidecode-type17.txt":
		return "memory"
	case name == "lsblk.json", name == "storcli64-drives.json", name == "storcli2-show-all.json",
		strings.HasPrefix(name, "smartctl-"), strings.HasPrefix(name, "nvme-"):
		return "storage"
	case name == "nvidia-smi-q.txt", name == "nvidia-smi-query.csv", name == "nvidia-smi-conf-compute-q.txt",
		name == "nvidia-smi-topo.txt", name == "nvidia-smi-nvlink-status.txt", name == "nvidia-smi-nvlink-errors.txt",
		name == "rocm-smi.txt", name == "rocm-smi-showallinfo.txt",
		name == "pcie-nvidia-link.txt", name == "pcie-nvidia-link-under-load.txt", name == "kernel-aer-nvidia.txt":
		return "gpu"
	default:
		// dmidecode-type0/1/2, ipmitool-*, sensors.json, lspci-vmm/vvv, and
		// anything CaptureTechnicalDump adds later that isn't claimed above.
		return "platform"
	}
}

// keepForBundleCopy excludes previously-built bundle archives that may be
// sitting in the export dir (defensive — BuildSupportBundle itself stages
// and writes its .tar.gz under os.TempDir(), not exportDir).
func keepForBundleCopy(rel string, _ os.FileInfo) bool {
	cleanRel := filepath.ToSlash(strings.TrimPrefix(filepath.Clean(rel), "./"))
	if cleanRel == "" {
		return true
	}
	if strings.HasPrefix(cleanRel, "bee-sat/") && strings.HasSuffix(cleanRel, ".tar.gz") {
		return false
	}
	if strings.HasPrefix(filepath.Base(cleanRel), "bee-support-") && strings.HasSuffix(cleanRel, ".tar.gz") {
		return false
	}
	return true
}

// categorizeExportTree copies the live bee export directory into destRoot,
// reshaped into the bundle's canonical layout:
//
//   - export/<device-bucket>/  — raw vendor-tool output (persisted techdump),
//     vendor-neutral, grouped by what the hardware is rather than which bee
//     tool produced it.
//   - export/reanimator.json   — the hardware snapshot, ready to POST to
//     Reanimator's /ingest/hardware endpoint.
//   - status/                  — computed diagnosis, not raw data: component
//     health verdicts, runtime status, metrics time series.
//   - tasks/                   — bee's own task-run bookkeeping (SAT/bench
//     run logs, orchestration state, service logs). Duplication with
//     export/ here is expected (e.g. a SAT run's narrative disk report).
//
// Used by both BuildSupportBundle (on-demand tar.gz) and the blackbox USB
// mirror, so both artifacts share one shape. includeMetricsDB is false for
// the blackbox mirror: metrics.db is a live, growing SQLite file and copying
// it whole every sync cycle was a major contributor to slow blackbox cycles
// (see blackbox_archive.go); the on-demand support bundle still wants it.
func categorizeExportTree(srcExportDir, destRoot string, includeMetricsDB bool) error {
	exportDir := filepath.Join(destRoot, "export")
	statusDir := filepath.Join(destRoot, "status")
	tasksDir := filepath.Join(destRoot, "tasks")
	stateDir := filepath.Join(tasksDir, "_state")
	servicesDir := filepath.Join(tasksDir, "_services")

	for _, dir := range []string{exportDir, statusDir, tasksDir, stateDir, servicesDir} {
		if err := os.MkdirAll(dir, 0755); err != nil {
			return err
		}
	}

	// Persisted hardware captures -> export/<bucket>/
	techdumpSrc := filepath.Join(srcExportDir, "techdump")
	if entries, err := os.ReadDir(techdumpSrc); err == nil {
		for _, entry := range entries {
			if entry.IsDir() {
				continue
			}
			// Stale leftover from before RunStorageAcceptancePack stopped
			// mirroring its narrative disk report here (it's bee's own
			// verdict, not raw tool output — belongs in tasks/bee-sat/ only).
			// Units captured with an older bee build may still have one on
			// disk; don't propagate it into the categorized layout.
			if strings.HasPrefix(entry.Name(), "disk-") && strings.HasSuffix(entry.Name(), "-report.txt") {
				continue
			}
			dst := filepath.Join(exportDir, techdumpBucketFor(entry.Name()), entry.Name())
			if err := copyPath(filepath.Join(techdumpSrc, entry.Name()), dst); err != nil {
				return err
			}
		}
	} else if !os.IsNotExist(err) {
		return err
	}

	// bee-audit.json -> tasks/_state/ (internal record) and
	// export/reanimator.json (vendor-facing copy), both carrying the latest
	// SAT-overlay-normalized status verdicts.
	if data, err := os.ReadFile(filepath.Join(srcExportDir, "bee-audit.json")); err == nil {
		normalized, err := ApplySATOverlay(data)
		if err != nil {
			normalized = data
		}
		if err := os.WriteFile(filepath.Join(stateDir, "bee-audit.json"), normalized, 0644); err != nil {
			return err
		}
		if err := os.WriteFile(filepath.Join(exportDir, "reanimator.json"), normalized, 0644); err != nil {
			return err
		}
	} else if !os.IsNotExist(err) {
		return err
	}

	// Computed diagnosis data -> status/
	for _, name := range []string{"component-status.json", "runtime-health.json", "runtime-health.log"} {
		src := filepath.Join(srcExportDir, name)
		if _, err := os.Stat(src); err != nil {
			continue
		}
		if err := copyPath(src, filepath.Join(statusDir, name)); err != nil {
			return err
		}
	}
	if includeMetricsDB {
		if _, err := os.Stat(DefaultMetricsDBPath); err == nil {
			if err := copyPath(DefaultMetricsDBPath, filepath.Join(statusDir, "metrics.db")); err != nil {
				return err
			}
		}
	}

	// Remaining orchestration state -> tasks/_state/
	for _, name := range []string{"blackbox-state.json", "tasks-state.json"} {
		src := filepath.Join(srcExportDir, name)
		if _, err := os.Stat(src); err != nil {
			continue
		}
		if err := copyPath(src, filepath.Join(stateDir, name)); err != nil {
			return err
		}
	}

	// bee-*.log service logs -> tasks/_services/
	if entries, err := os.ReadDir(srcExportDir); err == nil {
		for _, entry := range entries {
			name := entry.Name()
			if entry.IsDir() || !strings.HasPrefix(name, "bee-") || !strings.HasSuffix(name, ".log") {
				continue
			}
			if err := copyPath(filepath.Join(srcExportDir, name), filepath.Join(servicesDir, name)); err != nil {
				return err
			}
		}
	} else {
		return err
	}

	// SAT/bench run dirs, unchanged internally -> tasks/bee-sat/, tasks/bee-bench/
	for _, name := range []string{"bee-sat", "bee-bench"} {
		src := filepath.Join(srcExportDir, name)
		if _, err := os.Stat(src); err != nil {
			continue
		}
		if err := copyPathFiltered(srcExportDir, src, filepath.Join(tasksDir, name), keepForBundleCopy); err != nil {
			return err
		}
	}

	// Orchestration task-run reports, unchanged internally -> tasks/<NNN>_..._done/
	if src := filepath.Join(srcExportDir, "tasks"); dirExists(src) {
		if err := copyDirContentsFiltered(src, tasksDir, keepForBundleCopy); err != nil {
			return err
		}
	}

	return nil
}

func dirExists(path string) bool {
	info, err := os.Stat(path)
	return err == nil && info.IsDir()
}