// Copyright (C) 2020 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.


import * as m from 'mithril';

import {Actions} from '../common/actions';
import {QueryResponse} from '../common/queries';

import {globals} from './globals';
import {createPage} from './pages';


interface StatsSectionAttrs {
  title: string;
  subTitle: string;
  sqlConstraints: string;
  cssClass: string;
  queryId: string;
}

// Generic class that generate a <section> + <table> from the stats table.
// The caller defines the query constraint, title and styling.
// Used for errors, data losses and debugging sections.
class StatsSection implements m.ClassComponent<StatsSectionAttrs> {
  private queryDispatched = false;

  view({attrs}: m.CVnode<StatsSectionAttrs>) {
    if (!this.queryDispatched) {
      this.queryDispatched = true;
      globals.dispatch(Actions.executeQuery({
        engineId: '0',
        queryId: attrs.queryId,
        query: `select name, value, cast(ifnull(idx, '') as text) as idx,
                description, severity, source from stats
                where ${attrs.sqlConstraints || '1=1'}
                order by name, idx`,
      }));
    }

    const resp = globals.queryResults.get(attrs.queryId) as QueryResponse;
    if (resp === undefined || resp.totalRowCount === 0) {
      return m('');
    }
    if (resp.error) throw new Error(resp.error);

    const tableRows = [];
    for (const row of resp.rows) {
      const help = [];
      if (row.description) {
        help.push(m('i.material-icons.contextual-help', 'help_outline'));
      }
      const idx = row.idx !== '' ? `[${row.idx}]` : '';
      tableRows.push(m(
          'tr',
          m('td', {title: row.description}, `${row.name}${idx}`, help),
          m('td', `${row.value}`),
          m('td', `${row.severity} (${row.source})`),
          ));
    }

    return m(
        `section${attrs.cssClass}`,
        m('h2', attrs.title),
        m('h3', attrs.subTitle),
        m(
            'table',
            m('thead',
              m('tr', m('td', 'Name'), m('td', 'Value'), m('td', 'Type'))),
            m('tbody', tableRows),
            ),
    );
  }
}

class MetricErrors implements m.ClassComponent {
  view() {
    if (!globals.metricError) return;
    return m(
        `section.errors`,
        m('h2', `Metric Errors`),
        m('h3', `One or more metrics were not computed successfully:`),
        m('div.metric-error', globals.metricError));
  }
}

class TraceMetadata implements m.ClassComponent {
  private queryDispatched = false;
  private readonly QUERY_ID = 'info_metadata';

  view() {
    if (!this.queryDispatched) {
      this.queryDispatched = true;
      globals.dispatch(Actions.executeQuery({
        engineId: '0',
        queryId: this.QUERY_ID,
        query: `select name, ifnull(str_value, cast(int_value as text)) as value
                from metadata order by name`,
      }));
    }

    const resp = globals.queryResults.get(this.QUERY_ID) as QueryResponse;
    if (resp === undefined || resp.totalRowCount === 0) {
      return m('');
    }

    const tableRows = [];
    for (const row of resp.rows) {
      tableRows.push(m(
          'tr',
          m('td', `${row.name}`),
          m('td', `${row.value}`),
          ));
    }

    return m(
        'section',
        m('h2', 'System info and metadata'),
        m(
            'table',
            m('thead', m('tr', m('td', 'Name'), m('td', 'Value'))),
            m('tbody', tableRows),
            ),
    );
  }
}

class PackageList implements m.ClassComponent {
  private queryDispatched = false;
  private readonly QUERY_ID = 'info_package_list';

  view() {
    if (!this.queryDispatched) {
      this.queryDispatched = true;
      globals.dispatch(Actions.executeQuery({
        engineId: '0',
        queryId: this.QUERY_ID,
        query: `select package_name, version_code, debuggable,
                profileable_from_shell from package_list`,
      }));
    }

    const resp = globals.queryResults.get(this.QUERY_ID) as QueryResponse;
    if (resp === undefined || resp.totalRowCount === 0) {
      return m('');
    }

    const tableRows = [];
    for (const row of resp.rows) {
      tableRows.push(m(
          'tr',
          m('td', `${row.package_name}`),
          m('td', `${row.version_code}`),
          m('td',
            `${row.debuggable ? 'debuggable' : ''} ${
                row.profileable_from_shell ? 'profileable' : ''}`),
          ));
    }

    return m(
        'section',
        m('h2', 'Package list'),
        m(
            'table',
            m('thead',
              m('tr',
                m('td', 'Name'),
                m('td', 'Version code'),
                m('td', 'Flags'))),
            m('tbody', tableRows),
            ),
    );
  }
}

export const TraceInfoPage = createPage({
  view() {
    return m(
        '.trace-info-page',
        m(MetricErrors),
        m(StatsSection, {
          queryId: 'info_errors',
          title: 'Import errors',
          cssClass: '.errors',
          subTitle:
              `The following errors have been encountered while importing the
               trace. These errors are usually non-fatal but indicate that one
               or more tracks might be missing or showing erroneous data.`,
          sqlConstraints: `severity = 'error' and value > 0`,

        }),
        m(StatsSection, {
          queryId: 'info_data_losses',
          title: 'Data losses',
          cssClass: '.errors',
          subTitle:
              `These counters are collected at trace recording time. The trace
               data for one or more data sources was droppped and hence some
               track contents will be incomplete.`,
          sqlConstraints: `severity = 'data_loss' and value > 0`,
        }),
        m(TraceMetadata),
        m(PackageList),
        m(StatsSection, {
          queryId: 'info_all',
          title: 'Debugging stats',
          cssClass: '',
          subTitle: `Debugging statistics such as trace buffer usage and metrics
                     coming from the TraceProcessor importer stages.`,
          sqlConstraints: '',

        }),
    );
  }
});