#!/usr/bin/env bash
# vendored from sow-platform/deploy/scripts/promote-gitea.sh — keep in sync
# Channel pointer for sow-tools binary releases (service tier).
# channels.json values are version tags (vX.Y.Z), not SHAs.
set -euo pipefail

: "${GITEA_SERVER:?set GITEA_SERVER}"
: "${GITEA_TOKEN:?set GITEA_TOKEN}"
: "${GITEA_OWNER:?set GITEA_OWNER}"
: "${GITEA_REPO:?set GITEA_REPO}"

STREAM_NAME=sow-tools
STREAM_TIER=service
DRY_RUN="${DRY_RUN:-0}"

need() { command -v "$1" >/dev/null 2>&1 || { printf 'need: %s not found\n' "$1" >&2; exit 1; }; }
need jq curl
die() { printf '[channels] ERROR: %s\n' "$*" >&2; exit 1; }
log() { printf '[channels] %s\n' "$*" >&2; }

require_release() {
  local tag="$1" status
  status="$(curl -fsS -o /dev/null -w "%{http_code}" \
    -H "Authorization: token ${GITEA_TOKEN}" \
    "${GITEA_SERVER}/api/v1/repos/${GITEA_REPO}/releases/tags/${tag}" \
    2>/dev/null || echo "000")"
  [[ "$status" == "200" ]] || die "no Gitea release for tag ${tag} (HTTP $status)"
}

_auth="Authorization: token ${GITEA_TOKEN}"
_pkg_url="${GITEA_SERVER}/api/packages/${GITEA_OWNER}/generic/deployment-channels/${STREAM_NAME}/channels.json"
_pkg_del="${GITEA_SERVER}/api/v1/packages/${GITEA_OWNER}/generic/deployment-channels/${STREAM_NAME}"

valid_channel() { case "$1" in current|previous) return 0 ;; *) return 1 ;; esac; }

read_channels() {
  local tmp status
  tmp="$(mktemp)"
  status="$(curl -fsS -o "$tmp" -w "%{http_code}" -H "$_auth" "$_pkg_url" 2>/dev/null || echo "000")"
  case "$status" in
    200) jq -e . "$tmp" >/dev/null 2>&1 || die "invalid channels.json"; cat "$tmp" ;;
    404|000) printf '{}\n' ;;
    *) die "read channels.json: HTTP $status" ;;
  esac
  rm -f "$tmp"
}

write_channels() {
  local json="$1" tmp
  jq -e . <<<"$json" >/dev/null 2>&1 || die "refusing to write invalid channels.json"
  tmp="$(mktemp)"; jq -S . <<<"$json" >"$tmp"
  if [[ "$DRY_RUN" == "1" ]]; then
    log "DRY_RUN: would write:"; jq -S . "$tmp" >&2; rm -f "$tmp"; return 0
  fi
  curl -fsS -X DELETE -H "$_auth" "$_pkg_del" >/dev/null 2>&1 || true
  curl -fsS -X PUT -H "$_auth" -H "Content-Type: application/octet-stream" \
    --data-binary "@$tmp" "$_pkg_url" >/dev/null || die "write failed"
  rm -f "$tmp"
  log "deployment-channels/sow-tools updated"; jq -S . <<<"$json" >&2
}

cmd="${1:-show}"
case "$cmd" in
  show) read_channels | jq -S . ;;
  set)
    channel="${2:?}"; tag="${3:?}"
    valid_channel "$channel" || die "unknown channel: $channel"
    require_release "$tag"
    write_channels "$(read_channels | jq --arg c "$channel" --arg t "$tag" '.[$c]=$t')"
    ;;
  release)
    tag="${2:?}"
    require_release "$tag"
    write_channels "$(read_channels | jq --arg t "$tag" '
      (if .current then .previous = .current else . end) | .current = $t')"
    ;;
  *) die "usage: promote show | set <channel> <tag> | release <tag>" ;;
esac