#!/bin/bash
# Continuous Learning v2 - Project Detection Helper
#
# Shared logic for detecting current project context.
# Sourced by observe.sh and start-observer.sh.
#
# Exports:
#   _CLV2_PROJECT_ID     - Short hash identifying the project (or "global")
#   _CLV2_PROJECT_NAME   - Human-readable project name
#   _CLV2_PROJECT_ROOT   - Absolute path to project root
#   _CLV2_PROJECT_DIR    - Project-scoped storage directory under homunculus
#
# Also sets unprefixed convenience aliases:
#   PROJECT_ID, PROJECT_NAME, PROJECT_ROOT, PROJECT_DIR
#
# Detection priority:
#   1. CLAUDE_PROJECT_DIR env var (if set)
#   2. git remote URL (hashed for uniqueness across machines)
#   3. git repo root path (fallback, machine-specific)
#   4. "global" (no project context detected)

_CLV2_HOMUNCULUS_DIR="${HOME}/.claude/homunculus"
_CLV2_PROJECTS_DIR="${_CLV2_HOMUNCULUS_DIR}/projects"
_CLV2_REGISTRY_FILE="${_CLV2_HOMUNCULUS_DIR}/projects.json"

_clv2_resolve_python_cmd() {
  if [ -n "${CLV2_PYTHON_CMD:-}" ] && command -v "$CLV2_PYTHON_CMD" >/dev/null 2>&1; then
    printf '%s\n' "$CLV2_PYTHON_CMD"
    return 0
  fi

  if command -v python3 >/dev/null 2>&1; then
    printf '%s\n' python3
    return 0
  fi

  if command -v python >/dev/null 2>&1; then
    printf '%s\n' python
    return 0
  fi

  return 1
}

_CLV2_PYTHON_CMD="$(_clv2_resolve_python_cmd 2>/dev/null || true)"
export CLV2_PYTHON_CMD

_clv2_detect_project() {
  local project_root=""
  local project_name=""
  local project_id=""
  local source_hint=""

  # 1. Try CLAUDE_PROJECT_DIR env var
  if [ -n "$CLAUDE_PROJECT_DIR" ] && [ -d "$CLAUDE_PROJECT_DIR" ]; then
    project_root="$CLAUDE_PROJECT_DIR"
    source_hint="env"
  fi

  # 2. Try git repo root from CWD (only if git is available)
  if [ -z "$project_root" ] && command -v git &>/dev/null; then
    project_root=$(git rev-parse --show-toplevel 2>/dev/null || true)
    if [ -n "$project_root" ]; then
      source_hint="git"
    fi
  fi

  # 3. No project detected — fall back to global
  if [ -z "$project_root" ]; then
    _CLV2_PROJECT_ID="global"
    _CLV2_PROJECT_NAME="global"
    _CLV2_PROJECT_ROOT=""
    _CLV2_PROJECT_DIR="${_CLV2_HOMUNCULUS_DIR}"
    return 0
  fi

  # Derive project name from directory basename
  project_name=$(basename "$project_root")

  # Derive project ID: prefer git remote URL hash (portable across machines),
  # fall back to path hash (machine-specific but still useful)
  local remote_url=""
  if command -v git &>/dev/null; then
    if [ "$source_hint" = "git" ] || [ -d "${project_root}/.git" ]; then
      remote_url=$(git -C "$project_root" remote get-url origin 2>/dev/null || true)
    fi
  fi

  # Compute hash from the original remote URL (legacy, for backward compatibility)
  local legacy_hash_input="${remote_url:-$project_root}"

  # Strip embedded credentials from remote URL (e.g., https://ghp_xxxx@github.com/...)
  if [ -n "$remote_url" ]; then
    remote_url=$(printf '%s' "$remote_url" | sed -E 's|://[^@]+@|://|')
  fi

  local hash_input="${remote_url:-$project_root}"
  # Prefer Python for consistent SHA256 behavior across shells/platforms.
  if [ -n "$_CLV2_PYTHON_CMD" ]; then
    project_id=$(printf '%s' "$hash_input" | "$_CLV2_PYTHON_CMD" -c "import sys,hashlib; print(hashlib.sha256(sys.stdin.buffer.read()).hexdigest()[:12])" 2>/dev/null)
  fi

  # Fallback if Python is unavailable or hash generation failed.
  if [ -z "$project_id" ]; then
    project_id=$(printf '%s' "$hash_input" | shasum -a 256 2>/dev/null | cut -c1-12 || \
                 printf '%s' "$hash_input" | sha256sum 2>/dev/null | cut -c1-12 || \
                 echo "fallback")
  fi

  # Backward compatibility: if credentials were stripped and the hash changed,
  # check if a project dir exists under the legacy hash and reuse it
  if [ "$legacy_hash_input" != "$hash_input" ] && [ -n "$_CLV2_PYTHON_CMD" ]; then
    local legacy_id=""
    legacy_id=$(printf '%s' "$legacy_hash_input" | "$_CLV2_PYTHON_CMD" -c "import sys,hashlib; print(hashlib.sha256(sys.stdin.buffer.read()).hexdigest()[:12])" 2>/dev/null)
    if [ -n "$legacy_id" ] && [ -d "${_CLV2_PROJECTS_DIR}/${legacy_id}" ] && [ ! -d "${_CLV2_PROJECTS_DIR}/${project_id}" ]; then
      # Migrate legacy directory to new hash
      mv "${_CLV2_PROJECTS_DIR}/${legacy_id}" "${_CLV2_PROJECTS_DIR}/${project_id}" 2>/dev/null || project_id="$legacy_id"
    fi
  fi

  # Export results
  _CLV2_PROJECT_ID="$project_id"
  _CLV2_PROJECT_NAME="$project_name"
  _CLV2_PROJECT_ROOT="$project_root"
  _CLV2_PROJECT_DIR="${_CLV2_PROJECTS_DIR}/${project_id}"

  # Ensure project directory structure exists
  mkdir -p "${_CLV2_PROJECT_DIR}/instincts/personal"
  mkdir -p "${_CLV2_PROJECT_DIR}/instincts/inherited"
  mkdir -p "${_CLV2_PROJECT_DIR}/observations.archive"
  mkdir -p "${_CLV2_PROJECT_DIR}/evolved/skills"
  mkdir -p "${_CLV2_PROJECT_DIR}/evolved/commands"
  mkdir -p "${_CLV2_PROJECT_DIR}/evolved/agents"

  # Update project registry (lightweight JSON mapping)
  _clv2_update_project_registry "$project_id" "$project_name" "$project_root" "$remote_url"
}

_clv2_update_project_registry() {
  local pid="$1"
  local pname="$2"
  local proot="$3"
  local premote="$4"

  mkdir -p "$(dirname "$_CLV2_REGISTRY_FILE")"

  if [ -z "$_CLV2_PYTHON_CMD" ]; then
    return 0
  fi

  # Pass values via env vars to avoid shell→python injection.
  # Python reads them with os.environ, which is safe for any string content.
  _CLV2_REG_PID="$pid" \
  _CLV2_REG_PNAME="$pname" \
  _CLV2_REG_PROOT="$proot" \
  _CLV2_REG_PREMOTE="$premote" \
  _CLV2_REG_FILE="$_CLV2_REGISTRY_FILE" \
  "$_CLV2_PYTHON_CMD" -c '
import json, os
from datetime import datetime, timezone

registry_path = os.environ["_CLV2_REG_FILE"]
try:
    with open(registry_path) as f:
        registry = json.load(f)
except (FileNotFoundError, json.JSONDecodeError):
    registry = {}

registry[os.environ["_CLV2_REG_PID"]] = {
    "name": os.environ["_CLV2_REG_PNAME"],
    "root": os.environ["_CLV2_REG_PROOT"],
    "remote": os.environ["_CLV2_REG_PREMOTE"],
    "last_seen": datetime.now(timezone.utc).isoformat().replace("+00:00", "Z")
}

with open(registry_path, "w") as f:
    json.dump(registry, f, indent=2)
' 2>/dev/null || true
}

# Auto-detect on source
_clv2_detect_project

# Convenience aliases for callers (short names pointing to prefixed vars)
PROJECT_ID="$_CLV2_PROJECT_ID"
PROJECT_NAME="$_CLV2_PROJECT_NAME"
PROJECT_ROOT="$_CLV2_PROJECT_ROOT"
PROJECT_DIR="$_CLV2_PROJECT_DIR"