#!/usr/bin/env bash
# Fetches the current manifest.json from the public distribution repo (or starts fresh
# if this is the first release), merges in this build's version entry, and pushes it
# back -- all via Gitea's Contents API, so this never needs a git clone of the public
# repo. Keeps the private source repo and the public distribution repo fully decoupled.
#
# Required env vars:
#   GITEA_TOKEN, SERVER_URL, PUBLIC_REPO_OWNER, PUBLIC_REPO_NAME, VERSION, CHECKSUM, SOURCE_URL
set -euo pipefail

: "${GITEA_TOKEN:?}"
: "${SERVER_URL:?}"
: "${PUBLIC_REPO_OWNER:?}"
: "${PUBLIC_REPO_NAME:?}"
: "${VERSION:?}"
: "${CHECKSUM:?}"
: "${SOURCE_URL:?}"

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
API="${SERVER_URL}/api/v1/repos/${PUBLIC_REPO_OWNER}/${PUBLIC_REPO_NAME}/contents/manifest.json"
WORKDIR=$(mktemp -d)
trap 'rm -rf "$WORKDIR"' EXIT

HTTP_CODE=$(curl -s -o "$WORKDIR/existing.json" -w "%{http_code}" \
  -H "Authorization: token ${GITEA_TOKEN}" "${API}?ref=master")

if [ "$HTTP_CODE" = "200" ]; then
  SHA=$(python3 -c 'import json; print(json.load(open("'"$WORKDIR"'/existing.json"))["sha"])')
  python3 -c 'import json,base64
d = json.load(open("'"$WORKDIR"'/existing.json"))
open("'"$WORKDIR"'/manifest.json", "wb").write(base64.b64decode(d["content"]))'
  echo "Fetched existing manifest.json (sha ${SHA})"
else
  SHA=""
  echo "[]" > "$WORKDIR/manifest.json"
  echo "No existing manifest.json in ${PUBLIC_REPO_OWNER}/${PUBLIC_REPO_NAME} -- starting fresh (HTTP $HTTP_CODE)"
fi

python3 "$ROOT/dev/update_manifest.py" \
  --build-yaml "$ROOT/build.yaml" \
  --manifest "$WORKDIR/manifest.json" \
  --version "$VERSION" \
  --checksum "$CHECKSUM" \
  --source-url "$SOURCE_URL"

CONTENT_B64=$(base64 -w0 "$WORKDIR/manifest.json")

python3 -c 'import json,sys
body = {"content": sys.argv[1], "message": "Release " + sys.argv[2], "branch": "master"}
if sys.argv[3]:
    body["sha"] = sys.argv[3]
json.dump(body, open(sys.argv[4], "w"))' "$CONTENT_B64" "$VERSION" "$SHA" "$WORKDIR/body.json"

METHOD="POST"
if [ -n "$SHA" ]; then
  METHOD="PUT"
fi

curl -sf -X "$METHOD" \
  -H "Authorization: token ${GITEA_TOKEN}" \
  -H "Content-Type: application/json" \
  -d "@$WORKDIR/body.json" \
  "$API" > /dev/null

echo "Published manifest.json version ${VERSION} to ${PUBLIC_REPO_OWNER}/${PUBLIC_REPO_NAME}"