#!/bin/bash

set -euo pipefail

readonly LINE="=================================================="
readonly SUBLINE="--------------------------------------------------"

section() {
    printf '\n%s\n%s\n%s\n' "$LINE" "$1" "$SUBLINE"
}

info() {
    printf '[info] %s\n' "$1"
}

fail() {
    printf '[error] %s\n' "$1" >&2
    exit 1
}

require_env() {
    local name="$1"
    local value="$2"

    if [ -z "$value" ] || [ "$value" = "null" ]; then
        fail "$name 未設定"
    fi

    printf '%s=%s\n' "$name" "$value"
}

write_output() {
    printf 'version=%s\n' "$1" >> "$GITHUB_OUTPUT"
}

section "參數檢查"

require_env "GITEA_SERVER_URL" "${GITEA_SERVER_URL:-}"
require_env "GITEA_REPOSITORY" "${GITEA_REPOSITORY:-}"

if [ -n "${RUNNER_TOKEN:-}" ] && [ "${RUNNER_TOKEN:-}" != "null" ]; then
    printf 'RUNNER_TOKEN=%s\n' '***'
else
    printf 'RUNNER_TOKEN=%s\n' '未提供'
fi

IS_BETA="${IS_BETA:-false}"
if [ "$IS_BETA" = "null" ] || [ -z "$IS_BETA" ]; then
    IS_BETA="false"
fi
printf 'IS_BETA=%s\n' "$IS_BETA"

section "取得版本資料"

RELEASE_URL="$GITEA_SERVER_URL/api/v1/repos/$GITEA_REPOSITORY/releases"
info "RELEASE_URL=$RELEASE_URL"

if [ -n "${RUNNER_TOKEN:-}" ] && [ "${RUNNER_TOKEN:-}" != "null" ]; then
    info "使用授權 token 取得 release"
    RELEASE_JSON="$(curl -fsS -H "Authorization: token $RUNNER_TOKEN" "$RELEASE_URL")"
else
    info "使用匿名請求取得 release"
    RELEASE_JSON="$(curl -fsS "$RELEASE_URL")"
fi

LATEST_VERSION="$(
    printf '%s' "$RELEASE_JSON" | jq -r '
        [ .[] | select(.tag_name | test("-beta\\.") | not) | .tag_name ][0] // "v0.0.0"
    ' | sed 's/^v//'
)"

if [ -z "$LATEST_VERSION" ] || [ "$LATEST_VERSION" = "null" ]; then
    LATEST_VERSION="0.0.0"
fi

info "LATEST_VERSION=$LATEST_VERSION"

section "計算版本號"

IFS='.' read -r MAJOR MINOR PATCH <<< "$LATEST_VERSION"
MAJOR="${MAJOR:-0}"
MINOR="${MINOR:-0}"
PATCH="${PATCH:-0}"

PATCH=$((PATCH + 1))
if [ "$PATCH" -ge 10 ]; then
    PATCH=0
    MINOR=$((MINOR + 1))
fi

if [ "$MINOR" -ge 10 ]; then
    MINOR=0
    MAJOR=$((MAJOR + 1))
fi

NEW_VERSION="$MAJOR.$MINOR.$PATCH"

if [ "$IS_BETA" = "true" ]; then
    BETA="$(
        printf '%s' "$RELEASE_JSON" | jq -r --arg prefix "v$NEW_VERSION-beta." '
            [ .[] | select(.tag_name | startswith($prefix)) | .tag_name | ltrimstr($prefix) | tonumber ] | if length > 0 then max else 0 end
        '
    )"
    BETA=$((BETA + 1))
    NEW_VERSION="$NEW_VERSION-beta.$BETA"
fi

info "NEW_VERSION=$NEW_VERSION"
write_output "$NEW_VERSION"