TMPDIR=$(mktemp -d)

trap "rm -fr $TMPDIR" EXIT

source $EXAMPLE_DIR/../../lib/lib.sh

api=$url/api/v1
repo=root/example-automerge
export d=/srv/example/automerge

function reset_automerge_pr() {
    #
    # repository with a pull_request event workflow that always succeeds
    #
    mkdir -p $d

    forgejo-curl.sh api_json -X DELETE $api/repos/$repo >&/dev/null || true
    forgejo-test-helper.sh push_workflow actions/example-$example $url root example-$example setup-forgejo $token

    forgejo-curl.sh api_json -X DELETE $api/repos/$repo/actions/variables/SCRIPT >&/dev/null || true
    forgejo-curl.sh api_json -X POST --data-raw '{"value":"true"}' $api/repos/$repo/actions/variables/SCRIPT

    (
        cd $d
        rm -fr example-automerge
        git clone $url/$repo
        cd example-automerge
        git checkout -b other
        git config user.email root@example.com
        git config user.name username
        touch file-unique-to-the-pr-branch
        echo other >>README
        git add .
        git commit -m 'other change'
        git push --force -u origin other
    )

    #
    # make sure the runner won't race with the sequence that follows
    #
    forgejo-runner.sh teardown
    #
    # create a PR and schedule it for automerge when the workflow succeeds
    #
    api_pr_delete_all $api $repo
    forgejo-curl.sh api_json --data-raw '{"title":"PR title","base":"main","head":"other"}' $api/repos/$repo/pulls >$TMPDIR/pr.json
    local pr=$(jq -r .number <$TMPDIR/pr.json)
    forgejo-curl.sh api_json --data-raw '{"Do":"merge","merge_when_checks_succeed":true}' $api/repos/$repo/pulls/$pr/merge
    if api_pr_is_merged $api $repo $pr; then
        echo pull request already merged although it should not be
        return 1
    fi
}

function verify_automerge_on_status_success() {
    reset_automerge_pr
    local pr=$(jq -r .number <$TMPDIR/pr.json)
    #
    # run the workflow
    #
    forgejo-runner.sh run
    local sha=$(api_branch_tip $api $repo other)
    api_pr_wait_success $api $repo $sha
    #
    # verify the PR was automerged
    #
    if ! retry api_pr_is_merged $api $repo $pr; then
        echo pull request is not automerged as expected
        return 1
    fi
}

function verify_automerge_on_reviewer_approval() {
    reset_automerge_pr
    local pr=$(jq -r .number <$TMPDIR/pr.json)
    #
    # require at least one review for a PR to be merged
    #
    api_branch_protect $api $repo main
    #
    # run the workflow
    #
    forgejo-runner.sh run
    local sha=$(api_branch_tip $api $repo other)
    api_pr_wait_success $api $repo $sha
    #
    # approve the PR
    #
    local username=user1
    api_user_create $api $username $username@example.com
    api_user_make_admin $api $username
    user_login $username
    DOT=$API_TMPDIR/$username api_pr_approve $api $repo $pr
    #
    # verify the PR was automerged
    #
    if ! retry api_pr_is_merged $api $repo $pr; then
        echo pull request is not automerged as expected
        return 1
    fi
}

function main() {
    verify_automerge_on_status_success
    verify_automerge_on_reviewer_approval
}

main