export interface EnvVariables {
  [key: string]: {
    value: string | number | boolean,
    secure: boolean
  };
}

export function set(
  envs: EnvVariables, key: string, value: string | number | boolean, secure = false
): void {
  envs[key] = { value: value, secure: secure };
}

export function unset(envs: EnvVariables, key: string): void {
  delete envs[key];
}

export function serialize(envs: EnvVariables): string[] {
  return Object.keys(envs).map(key => `${key}=${envs[key].value}`);
}

export function unserialize(envs: string[]): EnvVariables {
  return envs.reduce((acc, curr) => {
    let splitted = curr.split('=');
    acc = Object.assign({}, acc, { [splitted[0]]: { value: splitted[1], secure: false } });
    return acc;
  }, {});
}

export function generate(data: any): EnvVariables {
  let envs = init();
  let request = data.requestData;
  let commit = request.data.pull_request && request.data.pull_request.head
    && request.data.pull_request.head.sha ||
    request.data.head_commit && request.data.head_commit.id ||
    request.data.sha ||
    request.data.object_attributes && request.data.object_attributes.last_commit &&
    request.data.object_attributes.last_commit.id ||
    request.data.push && request.data.push.changes[0].commits[0].hash ||
    request.data.pullrequest && request.data.pullrequest.source &&
    request.data.pullrequest.source.commit &&
    request.data.pullrequest.source.commit.hash ||
    request.data.commit || '';
  let prBranch = request.pr ? request.data.pull_request && request.data.pull_request.head &&
    request.data.pull_request.head.ref ||
    request.data.pullrequest && request.data.pullrequest.source &&
    request.data.pullrequest.source.branch &&
    request.data.pullrequest.source.branch.name ||
    request.data.object_attributes && request.data.object_attributes.source_branch ||
    request.data.pull_request && request.data.pull_request.head_branch : '';
  let tag = request.ref && request.ref.startsWith('refs/tags/') ?
    request.ref.replace('refs/tags/', '') : null;

  set(envs, 'ABSTRUSE_BRANCH', request.branch);
  set(envs, 'ABSTRUSE_BUILD_ID', data.build_id);
  set(envs, 'ABSTRUSE_JOB_ID', data.job_id);
  set(envs, 'ABSTRUSE_COMMIT', commit);
  set(envs, 'ABSTRUSE_EVENT_TYPE', request.pr ? 'pull_request' : 'push');
  set(envs, 'ABSTRUSE_PULL_REQUEST', request.pr ? request.pr : false);
  set(envs, 'ABSTRUSE_PULL_REQUEST_BRANCH', prBranch);
  set(envs, 'ABSTRUSE_TAG', tag);

  let prSha = request.pr ? commit : '';
  set(envs, 'ABSTRUSE_PULL_REQUEST_SHA', prSha);

  return envs;
}

export function init(): EnvVariables {
  return [
    'ABSTRUSE_BRANCH', 'ABSTRUSE_BUILD_DIR', 'ABSTRUSE_BUILD_ID',
    'ABSTRUSE_JOB_ID', 'ABSTRUSE_COMMIT', 'ABSTRUSE_EVENT_TYPE',
    'ABSTRUSE_PULL_REQUEST', 'ABSTRUSE_PULL_REQUEST_BRANCH',
    'ABSTRUSE_TAG', 'ABSTRUSE_PULL_REQUEST_SHA', 'ABSTRUSE_SECURE_ENV_VARS',
    'ABSTRUSE_TEST_RESULT'
  ].reduce((acc, curr) => {
    acc = Object.assign(acc, { [curr]: { value: null, secure: false } });
    return acc;
  }, {});
}