#!/usr/bin/env bash
# Symlink centralized skills/commands/hooks/context into each agent's config dir.
# For non-Nix machines (NixOS boxes use nix/home.nix instead).
# Idempotent. Backs up any pre-existing real dir once to <name>.bak.
set -euo pipefail

REPO="$(cd "$(dirname "$0")/.." && pwd)"

# targets: agent config skill roots. Claude Code reads ~/.claude/skills,
# Codex reads ~/.agents/skills. Both consume the same SKILL.md dirs.
CLAUDE_SKILLS="$HOME/.claude/skills"
CODEX_SKILLS="$HOME/.agents/skills"
CLAUDE_CMDS="$HOME/.claude/commands"   # commands are Claude-only; Codex ignores
CLAUDE_HOOKS="$HOME/.claude/hooks"     # hooks are Claude-only
CLAUDE_HOME="$HOME/.claude"            # CLAUDE.md fragments, pulled in via @name.md
AGENTS_HOME="$HOME/.agents"            # Codex global config root

# Per-FILE links, never a whole-dir link: ~/.claude/hooks and ~/.claude itself hold
# machine-local files this repo does not own, and a dir symlink would hide them.

# backups go OUTSIDE the skill dirs — a *.bak left inside gets discovered as a
# duplicate skill by both Claude Code and Codex.
BACKUP="$HOME/.agent-skills-backup"

link() { # link <src> <dst>
  local src="$1" dst="$2"
  if [ -e "$dst" ] && [ ! -L "$dst" ]; then
    mkdir -p "$BACKUP"
    mv "$dst" "$BACKUP/$(basename "$(dirname "$dst")")-$(basename "$dst").bak"
    echo "backed up existing $dst -> $BACKUP/"
  fi
  ln -sfn "$src" "$dst"
  echo "linked $dst -> $src"
}

mkdir -p "$CLAUDE_SKILLS" "$CODEX_SKILLS" "$CLAUDE_CMDS" "$CLAUDE_HOOKS" "$AGENTS_HOME"

for d in "$REPO"/skills/*/; do
  name="$(basename "$d")"
  link "$d" "$CLAUDE_SKILLS/$name"
  link "$d" "$CODEX_SKILLS/$name"
done

for f in "$REPO"/commands/*.md; do
  [ -e "$f" ] || continue
  link "$f" "$CLAUDE_CMDS/$(basename "$f")"
done

for f in "$REPO"/hooks/*.py "$REPO"/hooks/*.sh; do
  [ -e "$f" ] || continue
  link "$f" "$CLAUDE_HOOKS/$(basename "$f")"
done

for f in "$REPO"/claude-md/*.md; do
  [ -e "$f" ] || continue
  link "$f" "$CLAUDE_HOME/$(basename "$f")"
done

# Codex reads ~/.agents/AGENTS.md and has no @import, so the fragments are
# concatenated into a real file. Re-run this script after editing claude-md/.
rm -f "$AGENTS_HOME/AGENTS.md"
{
  echo "<!-- generated by agent-skills/bin/link.sh from claude-md/ — do not edit -->"
  echo
  cat "$REPO/claude-md/operating.md"
  echo
  cat "$REPO/claude-md/writing.md"
} > "$AGENTS_HOME/AGENTS.md"
echo "generated $AGENTS_HOME/AGENTS.md"

echo "done."
echo "hooks still need wiring in ~/.claude/settings.json — see hooks/README.md"