#!/usr/bin/env bash
# Plexum-fabric-channel-plugin local installer.
#
# Builds + installs:
#   ~/.plexum/plugins/plexum-fabric-channel/plexum-fabric-channel-plugin
#   ~/.plexum/plugins/plexum-fabric-channel/manifest.json (initial; empty channels list)
#   ~/.local/bin/plexum-fabric-register                  (CLI for binding agents)
#
# Re-runnable: rebuilds binaries; overwrites manifest only if --reset-manifest.
# Profile data (identity registry, channel configs) is never touched.
#
# Flags:
#   --profile <p>      Override profile root (default ~/.plexum)
#   --reset-manifest   Overwrite the manifest's channels list with one
#                      derived from current channels/*.json (matches what
#                      the plugin advertises at runtime). Useful after
#                      adding/removing channels.
set -euo pipefail

REPO="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)"
PROFILE_DIR="${HOME}/.plexum"
USER_BIN="${HOME}/.local/bin"
RESET_MANIFEST=0

while [[ $# -gt 0 ]]; do
    case "$1" in
        --profile) PROFILE_DIR="$2"; shift 2 ;;
        --reset-manifest) RESET_MANIFEST=1; shift ;;
        -h|--help) sed -n '2,/^set -euo/p' "$0" | sed -n '/^#/p' | sed 's/^# \{0,1\}//'; exit 0 ;;
        *) echo "unknown flag: $1" >&2; exit 2 ;;
    esac
done

log() { printf '\033[1;34m[fabric-install]\033[0m %s\n' "$*"; }

command -v go >/dev/null || { echo "go not found on PATH" >&2; exit 1; }

PLUGIN_DIR="${PROFILE_DIR}/plugins/plexum-fabric-channel"
mkdir -p "${PLUGIN_DIR}" "${USER_BIN}"

cd "${REPO}"
VERSION="$(git describe --tags --always 2>/dev/null || echo dev)"
LDFLAGS="-X main.Version=${VERSION}"
log "building plexum-fabric-channel-plugin (v=${VERSION})"
CGO_ENABLED=0 go build -ldflags="${LDFLAGS}" \
    -o "${PLUGIN_DIR}/plexum-fabric-channel-plugin" ./cmd/plexum-fabric-channel-plugin
log "building plexum-fabric-register"
CGO_ENABLED=0 go build -ldflags="${LDFLAGS}" \
    -o "${USER_BIN}/plexum-fabric-register" ./cmd/plexum-fabric-register

MANIFEST_PATH="${PLUGIN_DIR}/manifest.json"
if [[ ! -f "${MANIFEST_PATH}" || ${RESET_MANIFEST} -eq 1 ]]; then
    log "writing initial manifest at ${MANIFEST_PATH}"
    # Build channels[] from any channels/*.json that name our plugin.
    CHANNELS_DIR="${PROFILE_DIR}/channels"
    CHANNELS_JSON='[]'
    if [[ -d "${CHANNELS_DIR}" ]]; then
        CHANNELS_JSON=$(python3 -c "
import json, os, sys
out = []
for f in sorted(os.listdir('${CHANNELS_DIR}')):
    if not f.endswith('.json'): continue
    try:
        d = json.load(open(os.path.join('${CHANNELS_DIR}', f)))
    except Exception:
        continue
    if d.get('plugin') == 'plexum-fabric-channel':
        out.append({'name': f[:-5], 'outboundTool': 'send'})
print(json.dumps(out))
")
    fi
    cat > "${MANIFEST_PATH}" <<EOF
{
  "name": "plexum-fabric-channel",
  "version": "${VERSION}",
  "activation": "lazy",
  "executable": "plexum-fabric-channel-plugin",
  "contracts": {
    "channels": ${CHANNELS_JSON},
    "tools": [
      {
        "name": "send",
        "description": "Post a plain-text message to the bound Fabric channel as the agent user.",
        "inputSchema": {
          "type": "object",
          "properties": {
            "channel_name": {"type": "string"},
            "session_id":   {"type": "string"},
            "message":      {"type": "string"}
          },
          "required": ["channel_name", "message"]
        }
      }
    ]
  }
}
EOF
fi

cat <<EOF

[fabric-install] done.
  plugin binary:  ${PLUGIN_DIR}/plexum-fabric-channel-plugin
  manifest:       ${MANIFEST_PATH}
  register CLI:   ${USER_BIN}/plexum-fabric-register

Next steps:
  1. Bind agents:    plexum-fabric-register --agent-id <agent> --api-key fak_...
  2. Bind channels:  write \`${PROFILE_DIR}/channels/<plexum-name>.json\`
                     (see README); re-run install.sh --reset-manifest after
                     adding/removing channels.
  3. Allow plugin:   add "plexum-fabric-channel" to \`${PROFILE_DIR}/plexum.json\`
                     under .plugins.allow.
  4. Restart:        systemctl --user restart plexum
EOF