(function() {
  var API_BASE = '/api/admin';

  function headers(extra) {
    return Object.assign({
      'Accept': 'application/json',
    }, extra || {});
  }

  async function request(path, options) {
    var response = await fetch(API_BASE + path, Object.assign({
      credentials: 'same-origin',
      headers: headers(),
    }, options || {}));

    if (response.status === 204) {
      return null;
    }

    var payload = null;
    var text = '';

    try {
      payload = await response.json();
    } catch (_error) {
      text = await response.text();
    }

    if (!response.ok) {
      var message = payload && payload.error
        ? payload.error.message
        : payload && payload.message
          ? payload.message
          : text
            ? text
            : ('HTTP ' + response.status);
      var error = new Error(message);
      error.status = response.status;
      error.payload = payload;
      throw error;
    }

    return payload;
  }

  function get(path) {
    return request(path);
  }

  function post(path, body) {
    return request(path, {
      method: 'POST',
      headers: headers({ 'Content-Type': 'application/json' }),
      body: JSON.stringify(body),
    });
  }

  function patch(path, body) {
    return request(path, {
      method: 'PATCH',
      headers: headers({ 'Content-Type': 'application/json' }),
      body: JSON.stringify(body),
    });
  }

  function del(path) {
    return request(path, { method: 'DELETE' });
  }

  function postBytes(path, bytes, fileName) {
    return request(path, {
      method: 'POST',
      headers: headers(fileName ? { 'X-File-Name': fileName } : {}),
      body: bytes,
    });
  }

  window.CrankApi = {
    listWorkspaces: function() {
      return get('/workspaces');
    },
    listOperations: function(workspaceId) {
      return get('/workspaces/' + encodeURIComponent(workspaceId) + '/operations');
    },
    getOperation: function(workspaceId, operationId) {
      return get('/workspaces/' + encodeURIComponent(workspaceId) + '/operations/' + encodeURIComponent(operationId));
    },
    getOperationVersion: function(workspaceId, operationId, version) {
      return get('/workspaces/' + encodeURIComponent(workspaceId) + '/operations/' + encodeURIComponent(operationId) + '/versions/' + encodeURIComponent(version));
    },
    createOperation: function(workspaceId, payload) {
      return post('/workspaces/' + encodeURIComponent(workspaceId) + '/operations', payload);
    },
    updateOperation: function(workspaceId, operationId, payload) {
      return patch('/workspaces/' + encodeURIComponent(workspaceId) + '/operations/' + encodeURIComponent(operationId), payload);
    },
    deleteOperation: function(workspaceId, operationId) {
      return del('/workspaces/' + encodeURIComponent(workspaceId) + '/operations/' + encodeURIComponent(operationId));
    },
    archiveOperation: function(workspaceId, operationId) {
      return post('/workspaces/' + encodeURIComponent(workspaceId) + '/operations/' + encodeURIComponent(operationId) + '/archive', {});
    },
    createOperationVersion: function(workspaceId, operationId, payload) {
      return post('/workspaces/' + encodeURIComponent(workspaceId) + '/operations/' + encodeURIComponent(operationId) + '/versions', payload);
    },
    uploadProtoFile: function(workspaceId, operationId, content, fileName) {
      return postBytes(
        '/workspaces/' + encodeURIComponent(workspaceId) + '/operations/' + encodeURIComponent(operationId) + '/descriptors/proto',
        content,
        fileName
      );
    },
    listAgents: function(workspaceId) {
      return get('/workspaces/' + encodeURIComponent(workspaceId) + '/agents');
    },
    createAgent: function(workspaceId, payload) {
      return post('/workspaces/' + encodeURIComponent(workspaceId) + '/agents', payload);
    },
    getAgent: function(workspaceId, agentId) {
      return get('/workspaces/' + encodeURIComponent(workspaceId) + '/agents/' + encodeURIComponent(agentId));
    },
    updateAgent: function(workspaceId, agentId, payload) {
      return patch('/workspaces/' + encodeURIComponent(workspaceId) + '/agents/' + encodeURIComponent(agentId), payload);
    },
    deleteAgent: function(workspaceId, agentId) {
      return del('/workspaces/' + encodeURIComponent(workspaceId) + '/agents/' + encodeURIComponent(agentId));
    },
    saveAgentBindings: function(workspaceId, agentId, payload) {
      return post('/workspaces/' + encodeURIComponent(workspaceId) + '/agents/' + encodeURIComponent(agentId) + '/bindings', payload);
    },
    publishAgent: function(workspaceId, agentId, payload) {
      return post('/workspaces/' + encodeURIComponent(workspaceId) + '/agents/' + encodeURIComponent(agentId) + '/publish', payload);
    },
  };
}());