#!/bin/sh
# publish-codeberg-release.sh — upload assets to a Codeberg release.
#
# Usage:
#   publish_codeberg_release <repo> <tag> <asset-path>...
#
# Where:
#   <repo>        e.g. VARASYS/ZDDC
#   <tag>         e.g. zddc-server-v0.0.8-alpha.3 or archive-v0.0.3
#   <asset-path>  one or more files to attach to the release
#
# Prerequisites:
#   - $CODEBERG_TOKEN exported in the environment, with scope sufficient
#     to create/update releases on the target repo. (Codeberg/Gitea
#     terminology: "Application token with `write:repository` access".)
#   - curl, jq.
#
# Behavior:
#   - If a release for $tag does not exist on Codeberg, create it. The
#     prerelease flag is derived from the tag itself: if the version
#     part (text after the last 'v') contains a '-', it is a pre-release
#     (e.g. 'zddc-server-v0.0.8-alpha.2' → prerelease=true);
#     'zddc-server-v0.0.7' → prerelease=false. Codeberg orders releases
#     by published-at and sets a "Latest" badge against the latest
#     non-prerelease, so this matters.
#   - For each asset: if a same-named asset already exists, delete it
#     first (Codeberg/Gitea API doesn't support in-place replacement).
#     Then upload the new bytes.
#
# Idempotent: re-running with the same args leaves the release with the
# same set of assets.
#
# This file is meant to be sourced and invoked via the function name, but
# it's also runnable directly as a script for quick testing — when run
# directly (i.e., $0 ends in publish-codeberg-release.sh), the function
# is called with the script's argv.
#
# NOTE: We do NOT `set -eu` at the top, because that would leak into any
# caller that sources this file. The direct-run dispatch at the bottom
# turns -eu on for that path only.

CODEBERG_API="${CODEBERG_API:-https://codeberg.org/api/v1}"

# True iff $1's "version part" (text after last 'v') contains '-'.
# Tags with a '-' in the version part are pre-releases per the
# pre-release-semver scheme (see AGENTS.md "Releasing").
_is_prerelease() {
    _ver="${1##*v}"
    case "$_ver" in *-*) return 0 ;; *) return 1 ;; esac
}

# Fetch a release by tag. Echoes the numeric release ID, or empty on 404.
# Suppresses 404-on-stderr; other errors propagate.
_get_release_id() {
    _repo="$1"
    _tag="$2"
    _resp=$(curl -fsS -H "Authorization: token $CODEBERG_TOKEN" \
        "$CODEBERG_API/repos/$_repo/releases/tags/$_tag" 2>/dev/null) || _resp=""
    [ -z "$_resp" ] && return 0
    printf '%s' "$_resp" | jq -r '.id // empty'
}

# Create a release for the given tag. Echoes the new release ID. Bombs
# out on any error (the caller relies on stable behavior — releases
# don't get half-created).
_create_release() {
    _repo="$1"
    _tag="$2"
    if _is_prerelease "$_tag"; then
        _prerelease=true
    else
        _prerelease=false
    fi
    # Inline JSON; tag/name don't contain quotes per our naming rules.
    _body=$(printf '{"tag_name":"%s","name":"%s","prerelease":%s,"draft":false}' \
        "$_tag" "$_tag" "$_prerelease")
    curl -fsS \
        -X POST \
        -H "Authorization: token $CODEBERG_TOKEN" \
        -H "Content-Type: application/json" \
        -d "$_body" \
        "$CODEBERG_API/repos/$_repo/releases" \
        | jq -r '.id'
}

# Echo the asset ID for an asset of the given filename in the given
# release, or empty if no such asset.
_find_asset_id() {
    _repo="$1"
    _release_id="$2"
    _name="$3"
    curl -fsS -H "Authorization: token $CODEBERG_TOKEN" \
        "$CODEBERG_API/repos/$_repo/releases/$_release_id" \
        | jq -r --arg n "$_name" '.assets[] | select(.name == $n) | .id' \
        | head -1
}

_delete_asset() {
    _repo="$1"
    _asset_id="$2"
    curl -fsS -X DELETE \
        -H "Authorization: token $CODEBERG_TOKEN" \
        "$CODEBERG_API/repos/$_repo/releases/assets/$_asset_id" >/dev/null
}

_upload_asset() {
    _repo="$1"
    _release_id="$2"
    _asset_path="$3"
    _name=$(basename "$_asset_path")
    # Codeberg/Gitea expects the file under field name "attachment", and
    # the desired display name as the ?name= query parameter (otherwise
    # the original filename is used; we set both for clarity).
    curl -fsS -X POST \
        -H "Authorization: token $CODEBERG_TOKEN" \
        -F "attachment=@${_asset_path}" \
        "$CODEBERG_API/repos/$_repo/releases/$_release_id/assets?name=$(printf '%s' "$_name" | jq -sRr @uri)" \
        >/dev/null
}

publish_codeberg_release() {
    if [ $# -lt 3 ]; then
        echo "usage: publish_codeberg_release <repo> <tag> <asset-path>..." >&2
        return 2
    fi
    if [ -z "${CODEBERG_TOKEN:-}" ]; then
        echo "publish_codeberg_release: CODEBERG_TOKEN not set" >&2
        return 2
    fi
    _repo="$1"
    _tag="$2"
    shift 2

    _release_id=$(_get_release_id "$_repo" "$_tag")
    if [ -z "$_release_id" ]; then
        echo "  creating release for $_tag"
        _release_id=$(_create_release "$_repo" "$_tag")
        if [ -z "$_release_id" ] || [ "$_release_id" = "null" ]; then
            echo "publish_codeberg_release: failed to create release for $_tag" >&2
            return 1
        fi
    fi
    echo "  release id: $_release_id"

    for _asset_path do
        if [ ! -f "$_asset_path" ]; then
            echo "publish_codeberg_release: asset not readable: $_asset_path" >&2
            return 1
        fi
        _name=$(basename "$_asset_path")
        _existing=$(_find_asset_id "$_repo" "$_release_id" "$_name")
        if [ -n "$_existing" ]; then
            echo "  replacing existing asset $_name (id $_existing)"
            _delete_asset "$_repo" "$_existing"
        fi
        echo "  uploading $_name"
        _upload_asset "$_repo" "$_release_id" "$_asset_path"
    done
}

# When invoked directly (not sourced), call the function with argv.
case "${0##*/}" in
    publish-codeberg-release.sh)
        set -eu
        publish_codeberg_release "$@"
        ;;
esac