## nimpak/cli/enhanced_interface.nim
## Enhanced CLI Interface - System Synthesis Engine
##
## This module implements the enhanced CLI interface that transforms NimPak
## into a System Synthesis Engine with variant fingerprints, CAS storage,
## and comprehensive build-from-source capabilities.

import std/[strutils, times, json, tables, strformat, sequtils, algorithm, os]
import ../security/integrity_monitor, ../security/hash_verifier
import security_integration, core

type
  VariantId* = distinct string  ## BLAKE3 hash serving as variant fingerprint

  PackageVariant* = object
    id*: VariantId
    name*: string
    version*: string
    casPath*: string
    features*: Table[string, string]
    buildFlags*: Table[string, string]
    toolchain*: string
    target*: string
    installTime*: DateTime
    size*: int64
    integrity*: SecurityStatus
    backend*: string
    active*: bool  ## Has active symlinks
    repository*: string

  SearchResult* = object
    package*: string
    variants*: seq[PackageVariant]
    provides*: seq[string]
    description*: string

  OutputFormat* = enum
    FormatHuman, FormatJson, FormatPorcelain

# =============================================================================
# Variant Fingerprint System
# =============================================================================

proc calculateVariantId*(name, version: string, features: Table[string, string],
                        buildFlags: Table[string, string], toolchain, target: string): VariantId =
  ## Calculate BLAKE3 variant fingerprint from build configuration
  var components = @[name, version, toolchain, target]

  # Add sorted features for deterministic fingerprinting
  var featureKeys = toSeq(features.keys)
  featureKeys.sort()
  for key in featureKeys:
    components.add(fmt"{key}={features[key]}")

  # Add sorted build flags
  var flagKeys = toSeq(buildFlags.keys)
  flagKeys.sort()
  for key in flagKeys:
    components.add(fmt"{key}={buildFlags[key]}")

  let combined = components.join("|")
  # Simulate BLAKE3 hash (in real implementation, use actual BLAKE3)
  let hash = fmt"{combined.len:08x}{combined[0..min(7, combined.len-1)]}"
  result = VariantId(hash)

proc formatVariantId*(id: VariantId): string =
  ## Format variant ID for display
  let s = string(id)
  if s.len > 12:
    return s[0..11] & "..."
  return s

# =============================================================================
# Content Addressable Storage (CAS) Operations
# =============================================================================

proc getCasPath*(variant: PackageVariant): string =
  ## Get CAS filesystem path for variant
  let shortId = formatVariantId(variant.id)
  return fmt"/Programs/{variant.name}/{variant.version}-{shortId}/"

proc getVariantManifestPath*(variant: PackageVariant): string =
  ## Get path to variant manifest file
  return getCasPath(variant) / ".nip-manifest.json"

proc isVariantActive*(variant: PackageVariant): bool =
  ## Check if variant has active symlinks
  # Simulate symlink checking (in real implementation, check actual symlinks)
  return variant.active

proc getVariantSize*(variant: PackageVariant): int64 =
  ## Get variant filesystem size
  # Simulate size calculation (in real implementation, calculate actual size)
  return variant.size

# =============================================================================
# Enhanced Search Implementation
# =============================================================================

proc searchPackages*(query: string, format: OutputFormat = FormatHuman): string =
  ## Enhanced search with multi-repository intelligence

  # Simulate search results with variant information
  let mockResults = @[
    SearchResult(
      package: "nginx",
      description: "High-performance HTTP server and reverse proxy",
      provides: @["http-server", "reverse-proxy"],
      variants: @[
        PackageVariant(
          id: calculateVariantId("nginx", "1.27.1", {"http2": "true", "ssl": "openssl"}.toTable,
                                {"cflags": "-O2", "lto": "thin"}.toTable, "clang-18", "x86_64-linux-gnu"),
          name: "nginx", version: "1.27.1", repository: "arch/core",
          installTime: now() - 2.days, size: 45_000_000, integrity: SecurityVerified,
          backend: "pacman", active: true,
          features: {"http2": "true", "ssl": "openssl", "brotli": "false"}.toTable,
          buildFlags: {"cflags": "-O2 -pipe", "lto": "thin"}.toTable,
          toolchain: "clang-18", target: "x86_64-linux-gnu"
        ),
        PackageVariant(
          id: calculateVariantId("nginx", "1.27.1", {"http2": "true", "ssl": "openssl", "brotli": "true"}.toTable,
                                {"cflags": "-O3", "lto": "full"}.toTable, "gcc-13", "x86_64-linux-gnu"),
          name: "nginx", version: "1.27.1", repository: "aur",
          installTime: DateTime.fromUnix(0), size: 0, integrity: SecurityUnknown,
          backend: "aur", active: false,
          features: {"http2": "true", "ssl": "openssl", "brotli": "true"}.toTable,
          buildFlags: {"cflags": "-O3 -march=native", "lto": "full"}.toTable,
          toolchain: "gcc-13", target: "x86_64-linux-gnu"
        )
      ]
    ),
    SearchResult(
      package: "vim",
      description: "Vi IMproved - enhanced vi editor",
      provides: @["vi", "ex", "editor"],
      variants: @[
        PackageVariant(
          id: calculateVariantId("vim", "9.1.1623", {"gui": "false", "python": "true"}.toTable,
                                {"cflags": "-O2", "debug": "false"}.toTable, "gcc-13", "x86_64-linux-gnu"),
          name: "vim", version: "9.1.1623", repository: "arch/core",
          installTime: now() - 5.days, size: 12_000_000, integrity: SecurityUserModified,
          backend: "pacman", active: true,
          features: {"gui": "false", "python": "true", "lua": "false"}.toTable,
          buildFlags: {"cflags": "-O2", "debug": "false"}.toTable,
          toolchain: "gcc-13", target: "x86_64-linux-gnu"
        )
      ]
    )
  ]

  case format:
  of FormatJson:
    return formatSearchResultsJson(mockResults)
  of FormatPorcelain:
    return formatSearchResultsPorcelain(mockResults)
  else:
    return formatSearchResultsHuman(mockResults, query)

proc formatSearchResultsHuman*(results: seq[SearchResult], query: string): string =
  ## Format search results for human consumption
  result = fmt"🔍 Search results for '{query}':\n\n"

  for searchResult in results:
    result.add(fmt"📦 {searchResult.package}\n")
    result.add(fmt"   {searchResult.description}\n")

    if searchResult.provides.len > 0:
      result.add(fmt"   Provides: {searchResult.provides.join(\", \")}\n")

    result.add("   Variants:\n")

    for variant in searchResult.variants:
      let statusIcon = getSecurityStatusIcon(variant.integrity)
      let activeIcon = if variant.active: "🔗" else "◻"
      let casPath = getCasPath(variant)

      result.add(fmt"   {activeIcon} {statusIcon} {variant.version}-{formatVariantId(variant.id)} ")
      result.add(fmt"({variant.repository}) ")

      if variant.active:
        result.add(fmt"[{formatBytes(variant.size)}] ")
        result.add(fmt"installed {variant.installTime.format(\"MMM dd\")}")
      else:
        result.add("available")

      result.add("\n")
      result.add(fmt"      CAS: {casPath}\n")

      # Show key features
      var featureList: seq[string] = @[]
      for key, value in variant.features:
        if value == "true":
          featureList.add(fmt"+{key}")
        elif value != "false":
          featureList.add(fmt"{key}={value}")

      if featureList.len > 0:
        result.add(fmt"      Features: {featureList.join(\", \")}\n")

    result.add("\n")

proc formatSearchResultsJson*(results: seq[SearchResult]): string =
  ## Format search results as JSON
  var jsonResults = newJArray()

  for searchResult in results:
    var variants = newJArray()
    for variant in searchResult.variants:
      variants.add(%*{
        "variant_id": formatVariantId(variant.id),
        "version": variant.version,
        "repository": variant.repository,
        "cas_path": getCasPath(variant),
        "active": variant.active,
        "integrity_status": $variant.integrity,
        "install_time": if variant.active: variant.installTime.format("yyyy-MM-dd'T'HH:mm:ss'Z'") else nil,
        "size_bytes": if variant.active: variant.size else 0,
        "features": variant.features,
        "build_flags": variant.buildFlags,
        "toolchain": variant.toolchain,
        "target": variant.target,
        "backend": variant.backend
      })

    jsonResults.add(%*{
      "package": searchResult.package,
      "description": searchResult.description,
      "provides": searchResult.provides,
      "variants": variants
    })

  return pretty(jsonResults)

proc formatSearchResultsPorcelain*(results: seq[SearchResult]): string =
  ## Format search results in stable porcelain format
  result = "# package version variant_id repository active integrity cas_path size_bytes\n"

  for searchResult in results:
    for variant in searchResult.variants:
      let active = if variant.active: "active" else "available"
      let size = if variant.active: $variant.size else "0"
      let casPath = getCasPath(variant)

      result.add(fmt"{searchResult.package} {variant.version} {formatVariantId(variant.id)} ")
      result.add(fmt"{variant.repository} {active} {variant.integrity} {casPath} {size}\n")

# =============================================================================
# Enhanced List Implementation
# =============================================================================

proc listPackages*(pattern: string = "", format: OutputFormat = FormatHuman): string =
  ## CAS-aware list command with pattern filtering

  # Simulate installed packages with CAS information
  let mockPackages = @[
    PackageVariant(
      id: calculateVariantId("nginx", "1.27.1", {"http2": "true"}.toTable, {"cflags": "-O2"}.toTable, "clang-18", "x86_64-linux-gnu"),
      name: "nginx", version: "1.27.1", repository: "arch/core",
      installTime: now() - 2.days, size: 45_000_000, integrity: SecurityVerified,
      backend: "pacman", active: true,
      features: {"http2": "true", "ssl": "openssl"}.toTable,
      buildFlags: {"cflags": "-O2"}.toTable,
      toolchain: "clang-18", target: "x86_64-linux-gnu"
    ),
    PackageVariant(
      id: calculateVariantId("vim", "9.1.1623", {"python": "true"}.toTable, {"cflags": "-O2"}.toTable, "gcc-13", "x86_64-linux-gnu"),
      name: "vim", version: "9.1.1623", repository: "arch/core",
      installTime: now() - 5.days, size: 12_000_000, integrity: SecurityUserModified,
      backend: "pacman", active: true,
      features: {"python": "true", "gui": "false"}.toTable,
      buildFlags: {"cflags": "-O2"}.toTable,
      toolchain: "gcc-13", target: "x86_64-linux-gnu"
    ),
    PackageVariant(
      id: calculateVariantId("firefox", "131.0", {"wayland": "true"}.toTable, {"cflags": "-O2"}.toTable, "clang-18", "x86_64-linux-gnu"),
      name: "firefox", version: "131.0", repository: "arch/extra",
      installTime: now() - 1.days, size: 280_000_000, integrity: SecurityVerified,
      backend: "pacman", active: true,
      features: {"wayland": "true", "alsa": "true"}.toTable,
      buildFlags: {"cflags": "-O2"}.toTable,
      toolchain: "clang-18", target: "x86_64-linux-gnu"
    )
  ]

  # Apply pattern filtering
  var filteredPackages = mockPackages
  if pattern != "":
    filteredPackages = mockPackages.filter(proc(p: PackageVariant): bool = p.name.contains(pattern))

  case format:
  of FormatJson:
    return formatPackageListJson(filteredPackages)
  of FormatPorcelain:
    return formatPackageListPorcelain(filteredPackages)
  else:
    return formatPackageListHuman(filteredPackages)

proc formatPackageListHuman*(packages: seq[PackageVariant]): string =
  ## Format package list for human consumption
  result = fmt"📋 Installed packages ({packages.len}):\n\n"

  for pkg in packages:
    let statusIcon = getSecurityStatusIcon(pkg.integrity)
    let activeIcon = if pkg.active: "🔗" else "◻"
    let casPath = getCasPath(pkg)

    result.add(fmt"{activeIcon} {statusIcon} {pkg.name} {pkg.version}-{formatVariantId(pkg.id)}\n")
    result.add(fmt"   Repository: {pkg.repository} | Backend: {pkg.backend}\n")
    result.add(fmt"   CAS Path: {casPath}\n")
    result.add(fmt"   Size: {formatBytes(pkg.size)} | Installed: {pkg.installTime.format(\"yyyy-MM-dd HH:mm\")}\n")

    # Show integrity details for non-verified packages
    if pkg.integrity != SecurityVerified:
      let secInfo = getPackageSecurityInfo(pkg.name)
      result.add(fmt"   ⚠️  {secInfo.details}\n")

    result.add("\n")

proc formatPackageListJson*(packages: seq[PackageVariant]): string =
  ## Format package list as JSON
  var jsonPackages = newJArray()

  for pkg in packages:
    jsonPackages.add(%*{
      "name": pkg.name,
      "version": pkg.version,
      "variant_id": formatVariantId(pkg.id),
      "repository": pkg.repository,
      "backend": pkg.backend,
      "cas_path": getCasPath(pkg),
      "active": pkg.active,
      "integrity_status": $pkg.integrity,
      "install_time": pkg.installTime.format("yyyy-MM-dd'T'HH:mm:ss'Z'"),
      "size_bytes": pkg.size,
      "features": pkg.features,
      "build_flags": pkg.buildFlags,
      "toolchain": pkg.toolchain,
      "target": pkg.target
    })

  return pretty(%*{"packages": jsonPackages, "count": packages.len})

proc formatPackageListPorcelain*(packages: seq[PackageVariant]): string =
  ## Format package list in stable porcelain format
  result = "# name version variant_id repository backend active integrity cas_path size_bytes install_time\n"

  for pkg in packages:
    let active = if pkg.active: "active" else "inactive"
    let installTime = pkg.installTime.format("yyyy-MM-dd'T'HH:mm:ss'Z'")
    let casPath = getCasPath(pkg)

    result.add(fmt"{pkg.name} {pkg.version} {formatVariantId(pkg.id)} {pkg.repository} ")
    result.add(fmt"{pkg.backend} {active} {pkg.integrity} {casPath} {pkg.size} {installTime}\n")

# =============================================================================
# Utility Functions
# =============================================================================

proc formatBytes*(bytes: int64): string =
  ## Format byte count in human-readable form
  const units = ["B", "KB", "MB", "GB", "TB"]
  var size = float(bytes)
  var unitIndex = 0

  while size >= 1024.0 and unitIndex < units.len - 1:
    size /= 1024.0
    inc unitIndex

  if unitIndex == 0:
    return fmt"{int(size)} {units[unitIndex]}"
  else:
    return fmt"{size:.1f} {units[unitIndex]}"

# =============================================================================
# Command Execution Interface
# =============================================================================

proc executeEnhancedCommand*(command: string, args: seq[string], format: OutputFormat = FormatHuman): string =
  ## Execute enhanced CLI commands
  case command:
  of "search":
    let query = if args.len > 0: args[0] else: ""
    return searchPackages(query, format)

  of "list", "ls":
    let pattern = if args.len > 0: args[0] else: ""
    return listPackages(pattern, format)

  of "show":
    if args.len == 0:
      return error("Package name required for show command")
    return showPackageDetails(args[0], format)

  of "where":
    if args.len == 0:
      return error("Package name required for where command")
    return showPackageLocation(args[0])

  of "files":
    if args.len == 0:
      return error("Package name required for files command")
    return showPackageFiles(args[0], format)

  else:
    return error(fmt"Unknown enhanced command: {command}")

proc showPackageDetails*(packageName: string, format: OutputFormat = FormatHuman): string =
  ## Show comprehensive package information
  # This is a placeholder - would be implemented with actual package data
  return fmt"📦 Package details for {packageName} (placeholder implementation)"

proc showPackageLocation*(packageName: string): string =
  ## Show CAS filesystem path for package
  # This is a placeholder - would be implemented with actual CAS lookup
  return fmt"📍 CAS location for {packageName}: /Programs/{packageName}/version-hash/ (placeholder)"

proc showPackageFiles*(packageName: string, format: OutputFormat = FormatHuman): string =
  ## Show files owned by package
  # This is a placeholder - would be implemented with actual file listing
  return fmt"📄 Files for {packageName} (placeholder implementation)"