import { h, Component, createRef } from 'preact';
import { route } from 'preact-router';
import WBNavbarCommon from 'wb-navbar-common';
import WBArvadosCrumbs from 'wb-arvados-crumbs';
import WBBrowseDialog from 'wb-browse-dialog';
import WBTable from 'wb-table';
import WBNameAndUuid from 'wb-name-and-uuid';
import makeArvadosRequest from 'make-arvados-request';
import { wbDisableControls, wbEnableControls } from 'wb-disable-controls';
import linkState from 'linkstate';

function parseDefinition(text) {
  let definition;
  try {
    definition = JSON.parse(text);
  } catch (_) {
    definition = jsyaml.load(text);
  }
  return definition;
}

function encodeURIComponentIncludingDots(s) {
  return encodeURIComponent(s).replace('.', '%2E');
}

function inputSpecInfo(inputSpec) {
  const isFile = (inputSpec.type === 'File' || inputSpec.type === 'File[]' ||
    (inputSpec.type.type === 'array' && [].concat(inputSpec.type.items).indexOf('File') !== -1));

  const isDirectory = (inputSpec.type === 'Directory' || inputSpec.type === 'Directory[]' ||
    (inputSpec.type.type === 'array' && [].concat(inputSpec.type.items).indexOf('Directory') !== -1));

  const isArray = (inputSpec.type === 'File[]' || inputSpec.type === 'Directory[]' ||
    inputSpec.type.type === 'array');

  return { isFile, isDirectory, isArray };
}

function uuidsToCwl(obj) {
  if (obj instanceof Array) {
    const res = [];
    for (let k in obj) {
        res[k] = uuidsToCwl(obj[k]);
    }
    return res;
  }

  if (typeof(obj) === 'string' &&
    (/^[0-9a-z]{5}-[0-9a-z]{5}-[0-9a-z]{15}/.exec(obj) ||
      /^[0-9a-f]{32}\+[0-9]+/.exec(obj))) {

    const isDirectory = obj.endsWith('/');

    return {
      'class': (isDirectory ? 'Directory' : 'File'),
      'location': 'keep:' + (isDirectory ? obj.substr(0, obj.length - 1) : obj)
    };
  }

  throw Error('Expected Arvados path or array of paths');
}

function parseKeepRef(value) {
  if (typeof(value) === 'object' && 'location' in value && value.location.startsWith('keep:'))
    return value.location.substr(5);
  return value;
}

class WBPathDisplay extends Component {
  fetchData() {
    const { app } = this.props;
    const { arvHost, arvToken } = app.state;
    let { path } = this.props;
    if (path.endsWith('/'))
      path = path.substr(0, path.length - 1);
    let m;
    if (m = /^[0-9a-f]{32}\+[0-9]+/.exec(path));
    else if (m = /^[a-z0-9]{5}-[a-z0-9]{5}-[a-z0-9]{15}/.exec(path));
    else return;
    let prom = makeArvadosRequest(arvHost, arvToken,
      '/arvados/v1/collections/' + m[0]);
    prom = prom.then(xhr => this.setState({
      item: xhr.response,
      tail: path.substr(m[0].length)
    }));
    prom = prom.catch(() => this.setState({ 'error': 'Cannot load' }));
  }

  componentDidMount() {
    this.fetchData();
  }

  componentWillReceiveProps(nextProps) {
    this.props = nextProps;
    this.fetchData();
  }

  render({}, { item, tail, error }) {
    if (error)
      return error;

    if (!item)
      return 'Loading...';

    return (
      <span>
        <a href={ '/collection-browse/' + item.uuid }>
          { item.name || item.uuid }
        </a><a href={ '/collection-browse/' + item.uuid + '/' + encodeURIComponentIncludingDots(tail) }>
          { tail }
        </a>
      </span>
    );
  }
}

class WBLaunchWorkflowPage extends Component {
  constructor(...args) {
    super(...args);
    this.browseDialogRef = createRef();
    this.state.inputs = {};
    this.state.errors = [];
  }

  componentDidMount() {
    let { app, workflowUuid } = this.props;
    let { arvHost, arvToken } = app.state;

    let prom = makeArvadosRequest(arvHost, arvToken,
      '/arvados/v1/workflows/' + workflowUuid);
    prom = prom.then(xhr => {
        const def = parseDefinition(xhr.response.definition);
        const inputs = {};
        const main = def['$graph'].find(a => (a.id === '#main'));
        main.inputs.map(a => (inputs[a.id] = JSON.stringify(a.default)));
        this.setState({
        'workflow': xhr.response,
        'workflowDefinition': def,
        'defaultProcessName': xhr.response.name + ' ' + (new Date().toISOString()),
        'defaultProcessDescription': xhr.response.description,
        inputs
      });
    });
  }

  renderInput(inputSpec) {
    const { app } = this.props;

    const { isFile, isDirectory, isArray } = inputSpecInfo(inputSpec);

    if (!isFile && !isDirectory)
      return (
        <div>
          <input class="form-control w-100" type="text" placeholder={ inputSpec.label }
            value={ this.state.inputs[inputSpec.id] }
            onchange={ e => (this.state.inputs[inputSpec.id] = e.target.value) }></input>
          <div class="mt-2 text-muted">{ inputSpec.doc }</div>
        </div>
      );

    const button = (
      <button class="btn btn-outline-primary"
        onclick={ e => {
          e.preventDefault();
          this.browseDialogRef.current.show(
            [].concat(isFile ? 'file' : []).concat(isDirectory ? 'directory' : []),
            isArray,
            v => {
              this.state.inputs[inputSpec.id] = JSON.stringify(v);
              this.setState({});
            });
        } }>
        Browse...
      </button>
    );

    let value = this.state.inputs[inputSpec.id];
    if (value) {
      try {
        value = jsyaml.load(value);
      } catch (_) {}
    }

    return (
      <div>
        <div class="input-group">
          <input class="form-control w-100" type="text" placeholder={ inputSpec.label }
            value={ this.state.inputs[inputSpec.id] }
            onchange={ e => (this.state.inputs[inputSpec.id] = e.target.value) }></input>
          <div class="input-group-append">
            { button }
          </div>
        </div>
        <div class="mt-2 text-muted">{ inputSpec.doc }</div>
        { value ?
          isArray ? (
            <ul class="mb-0">
              { value.map(path => (
                <li>
                  <WBPathDisplay app={ app } path={ parseKeepRef(path) } />
                </li>
              )) }
            </ul>
        ) : (
          <WBPathDisplay app={ app } path={ parseKeepRef(value) } />
        ) : null }
      </div>
    );
  }

  submit() {
    // first see if all inputs are parseable
    const inputs = {};
    const errors = [];

    const { workflowDefinition } = this.state;
    const main = workflowDefinition['$graph'].find(a => (a.id === '#main'));

    for (let k in this.state.inputs) {
      try {
        let val = jsyaml.safeLoad(this.state.inputs[k]);
        val = uuidsToCwl(val);
        k = k.split('/').slice(1).join('/');
        inputs[k] = (val === undefined ? null : val);
      } catch (exc) {
        errors.push('Error parsing ' + k + ': ' + exc.message);
      }
    }

    if (errors.length > 0) {
      this.setState({ errors });
      return;
    }

    // prepare a request
    const { app, workflowUuid } = this.props;
    const { processName, processDescription,
      defaultProcessName, defaultProcessDescription,
      projectUuid } = this.state;
    const { arvHost, arvToken, currentUser } = app.state;
    const req = {
      name: processName || defaultProcessName,
      description: processDescription || defaultProcessDescription,
      owner_uuid: projectUuid || currentUser.uuid,
      container_image: 'arvados/jobs',
      properties: {
        template_uuid: workflowUuid
      },
      runtime_constraints: {
        API: true,
        vcpus: 1,
        ram: 1073741824
      },
      cwd: '/var/spool/cwl',
      command: [
        'arvados-cwl-runner',
        '--local',
        '--api=containers',
        '--project-uuid=' + (projectUuid || currentUser.uuid),
        '--collection-cache-size=256',
        '/var/lib/cwl/workflow.json#main',
        '/var/lib/cwl/cwl.input.json'],
      output_path: '/var/spool/cwl',
      priority: 1,
      state: 'Committed',
      mounts: {
        'stdout': {
          kind: 'file',
          path: '/var/spool/cwl/cwl.output.json'
        },
        '/var/spool/cwl': {
          kind: 'collection',
          writable: true
        },
        '/var/lib/cwl/workflow.json': {
          kind: 'json',
          content: workflowDefinition
        },
        '/var/lib/cwl/cwl.input.json': {
          kind: 'json',
          content: inputs
        }
      }
    };

    wbDisableControls();
    let prom = makeArvadosRequest(arvHost, arvToken,
      '/arvados/v1/container_requests',
      { method: 'POST', data: JSON.stringify(req) });
    prom = prom.then(xhr => {
      wbEnableControls();
      route('/process/' + xhr.response.uuid);
    });

    // throw Error('Not implemented');
  }

  render({ app, workflowUuid },
    { workflow, workflowDefinition, projectUuid, processName, processDescription,
    defaultProcessName, defaultProcessDescription, errors }) {

    return (
      <div>
        <WBNavbarCommon app={ app } />

        <WBBrowseDialog app={ app } ref={ this.browseDialogRef } />

        { workflow ?
          (<form class="container-fluid">
            <h1>Launch Workflow</h1>

            <div class="form-group">
              <label>Workflow</label>
              <WBArvadosCrumbs app={ app } uuid={ workflowUuid } />
            </div>

            <div class="form-group">
              <label for="projectUuid">Project UUID</label>

              <div class="input-group mb-3">
                <input type="text" class="form-control" id="projectUuid"
                  placeholder="Enter Project UUID" aria-label="Project UUID"
                  aria-describedby="button-addon2" value={ projectUuid }
                  onChange={ linkState(this, 'projectUuid') } />
                <div class="input-group-append">
                  <button class="btn btn-primary" type="button"
                    id="button-addon2" onclick={ e => { e.preventDefault();
                      this.browseDialogRef.current.show('owner', false,
                        projectUuid => this.setState({ projectUuid })); } }>Browse</button>
                </div>
              </div>

              { projectUuid ? (
                <WBArvadosCrumbs app={ app } uuid={ projectUuid } />
              ) : null }
            </div>

            <div class="form-group">
              <label for="processName">Process Name</label>
              <input type="text" class="form-control" id="processName"
                placeholder={ defaultProcessName } value={ processName }
                onChange={ linkState(this, 'processName') }/>
            </div>

            <div class="form-group">
              <label for="processDescription">Process Description</label>
              <input type="text" class="form-control" id="processDescription"
                placeholder={ defaultProcessDescription } value={ processDescription }
                onChange={ linkState(this, 'processDescription') } />
            </div>

            <div class="form-group">
              <label for="inputs">Inputs</label>
              <WBTable columns={ [ 'Name', 'Value'] }
                rows={ workflowDefinition.$graph.find(a => (a.id === '#main')).inputs.map(it => [
                  it.label || it.id,
                  this.renderInput(it)
                ]) } />
            </div>

            <div class="form-group">
              <button class="btn btn-success" onclick={ e => { e.preventDefault(); this.submit(); } }>
                Submit
              </button>
            </div>

            { errors.length > 0 ? (
              <div class="form-group">
                { errors.map(err => (
                  <div class="alert alert-danger" role="alert">
                    { err }
                  </div>
                ))}
              </div>
            ) : null }
          </form>) : <div>Loading...</div> }
      </div>
    );
  }
}

export default WBLaunchWorkflowPage;