{#each Object.entries(schueler) as [klasse, schueler]}
  <h3 class="title">{klasse}</h3>
  <table class="table is-striped">
    <thead>
      <tr>
        <th><abbr title="hashid">ID</abbr></th>
        <th>Name</th>
        <th>Vorname</th>
        <th>Projektwahl</th>
      </tr>
    </thead>
    <tbody>
      {#each schueler as s}
        <tr>
          <td>{s.hashid}</td>
          <td>{s.Name}</td>
          <td>{s.Vorname}</td>
          <td class={'has-background-'+wahl(s)} on:click={() => modalset(s)} style="cursor: pointer">
            {`Woche: ${s.woche || '–'} Mo/Di: ${s.mo_di || '–'} Mi/Do ${s.mi_do || '–'}`}
          </td>
        </tr>
      {/each}
    </tbody>
  </table>
{/each}
{#if modal_s}
  <div class="modal" class:is-active={modal}>
    <div class="modal-background"></div>
    <div class="modal-card">
      <header class="modal-card-head">
        <p class="modal-card-title">{modal_s.Vorname} {modal_s.Name}</p>
        <button class="delete" aria-label="close" on:click={() => modal = !modal}></button>
      </header>
      <section class="modal-card-body">
        <div class="field is-horizontal">
          <div class="field-label is-normal">
            <label class="label">Woche</label>
          </div>
          <div class="field-body">
            <div class="field is-narrow">
              <div class="control">
                <div class="select is-fullwidth">
                  <select bind:value={selected_woche} on:change={wahl_aendern}>
                    <option value={null}>Kein Projekt gewählt</option>
                    {#each projekte.filter(p => p.woche) as p}
                      <option value={p.id} selected={modal_s.woche}>{`${p.titel} – ${p.leitung} (${p.gewaehlt_woche}/${p.max_teilnehmer}`})</option>
                    {/each}
                    <option value={0} selected={modal_s.woche === 0}>Krank/Beurlaubt</option>
                  </select>
                </div>
              </div>
            </div>
          </div>
        </div>
        <div class="field is-horizontal">
          <div class="field-label is-normal">
            <label class="label">Mo/Di</label>
          </div>
          <div class="field-body">
            <div class="field is-narrow">
              <div class="control">
                <div class="select is-fullwidth">
                  <select bind:value={selected_mo_di} on:change={wahl_aendern}>
                    <option value={null}>Kein Projekt gewählt</option>
                    {#each projekte.filter(p => p.mo_di) as p}
                      <option value={p.id} selected={modal_s.mo_di}>{`${p.titel} – ${p.leitung} (${p.gewaehlt_mo_di}/${p.max_teilnehmer}`})</option>
                    {/each}
                    <option value={0} selected={modal_s.mo_di === 0}>Krank/Beurlaubt</option>
                  </select>
                </div>
              </div>
            </div>
          </div>
        </div>
        <div class="field is-horizontal">
          <div class="field-label is-normal">
            <label class="label">Mi/Do</label>
          </div>
          <div class="field-body">
            <div class="field is-narrow">
              <div class="control">
                <div class="select is-fullwidth">
                  <select bind:value={selected_mi_do} on:change={wahl_aendern}>
                    <option value={null}>Kein Projekt gewählt</option>
                    {#each projekte.filter(p => p.mi_do) as p}
                      <option value={p.id} selected={modal_s.mi_do}>
                        {`${p.titel} – ${p.leitung} (${p.gewaehlt_mi_do}/${p.max_teilnehmer}`})
                      </option>
                    {/each}
                    <option value={0} selected={modal_s.mi_do === 0}>Krank/Beurlaubt</option>
                  </select>
                </div>
              </div>
            </div>
          </div>
        </div>
      </section>
      <footer class="modal-card-foot background-is-info">
        Änderungen sind sofort wirksam
      </footer>
    </div>
  </div>
{/if}

<script>
  export let schueler, klasse, privat
  let projekte = [], klassen = [], modal = false, modal_s, selected_woche, selected_mo_di, selected_mi_do
  const modalset = s => {
    modal = true
    modal_s=s
  }
  $: console.log(modal_s)
  const { Pool } = R('pg')
  const pool = new Pool({ connectionString: privat.mein_bk_db})
  import { onMount, onDestroy } from 'svelte';
	onMount(_ => {
    pool.query(`SELECT id, titel, leitung, woche, mo_di, mi_do, max_teilnehmer,
                  (SELECT COUNT(*)
                    FROM wahlen
                    WHERE projekte.id = wahlen.woche
                  ) as gewaehlt_woche,
                  (SELECT COUNT(*)
                    FROM wahlen
                    WHERE projekte.id = wahlen.mo_di
                  ) as gewaehlt_mo_di,
                  (SELECT COUNT(*)
                    FROM wahlen
                    WHERE projekte.id = wahlen.mi_do
                  ) as gewaehlt_mi_do
                FROM projekte`,
      (err, resp) => projekte = resp.rows)
    pool.query(`SELECT * FROM klassen`,
      (err, resp) => klassen = resp.rows)
  })
  onDestroy(_ => {
    pool.end()
  })
  function wahl (s) {
    if (s.woche === s.mo_di && s.woche === s.mi_do) return 'danger'
    else if (typeof(s.mo_di) !== typeof(s.mi_do)) return 'warning'
    else if ([s.mo_di, s.mi_do, s.woche].includes(0)) return 'info'
    else return 'success'
  }
  const wahl_aendern = async e => {
    const text = `INSERT INTO wahlen(schueler_hashid, woche, mo_di, mi_do)
                    VALUES($1, $2, $3, $4)
                  ON CONFLICT (schueler_hashid) DO
                    UPDATE SET woche=$2, mo_di=$3, mi_do=$4
                  RETURNING *`
    const values = [modal_s.hashid, selected_woche, selected_mo_di, selected_mi_do]
    try {
      const res = await pool.query(text, values)
      modal_s = Object.assign(modal_s, res.rows[0])
      console.log('modal_s ändert sich:', modal_s)
    } catch(err) {
      console.log(err.stack)
    }
  }
</script>