#!/usr/bin/env bash
# Install the skills plugin globally into ~/.claude/.
#
# Each top-level directory that contains a SKILL.md is treated as
# a skill. For each such <name>, creates symlinks:
#   ~/.claude/skills/<name>  -> <repo>/<name>
#   ~/.claude/agents/<name>  -> <repo>/<name>/agents   (if that dir exists)
# and, for each executable Workflow script the skill ships:
#   ~/.claude/workflows/<file>.js -> <repo>/<name>/workflows/<file>.js
# (the flat .claude/workflows/ dir is where the Workflow tool resolves
# named workflows from — e.g. implement/workflows/implement-loop.js).
#
# Idempotent — existing symlinks pointing to this repo are left
# alone; existing entries that point elsewhere are reported and
# skipped. Pass --force to repoint such divergent symlinks at this
# clone (used to take the live set over from another checkout).

set -euo pipefail

FORCE=0
for arg in "$@"; do
    case "$arg" in
        --force) FORCE=1 ;;
        *) echo "unknown argument: $arg (only --force is accepted)" >&2; exit 2 ;;
    esac
done

REPO_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

CLAUDE_SKILLS="$HOME/.claude/skills"
CLAUDE_AGENTS="$HOME/.claude/agents"
CLAUDE_WORKFLOWS="$HOME/.claude/workflows"

mkdir -p "$CLAUDE_SKILLS" "$CLAUDE_AGENTS" "$CLAUDE_WORKFLOWS"

link_one() {
    local src="$1"
    local dst="$2"
    if [ -L "$dst" ]; then
        local existing
        existing="$(readlink "$dst")"
        if [ "$existing" = "$src" ]; then
            echo "ok    $dst -> $src"
            return 0
        fi
        if [ "$FORCE" -eq 1 ]; then
            ln -sfn "$src" "$dst"
            echo "relink $dst -> $src (was $existing)"
            return 0
        fi
        echo "skip  $dst already symlinked to $existing (use --force to repoint)"
        return 0
    fi
    if [ -e "$dst" ]; then
        echo "skip  $dst exists and is not a symlink"
        return 0
    fi
    ln -s "$src" "$dst"
    echo "link  $dst -> $src"
}

for d in "$REPO_DIR"/*/; do
    [ -d "$d" ] || continue
    [ -f "$d/SKILL.md" ] || continue
    name="$(basename "$d")"
    link_one "${d%/}" "$CLAUDE_SKILLS/$name"
    if [ -d "$d/agents" ]; then
        link_one "${d%/}/agents" "$CLAUDE_AGENTS/$name"
    fi
    if [ -d "$d/workflows" ]; then
        for wf in "$d"workflows/*.js; do
            [ -f "$wf" ] || continue
            link_one "$wf" "$CLAUDE_WORKFLOWS/$(basename "$wf")"
        done
    fi
done

echo
echo "Install complete."
echo "Next: add a '## Skills plugin: project facts' section to each"
echo "project's CLAUDE.md (template: $REPO_DIR/templates/CLAUDE.md.fragment)."