package server

import (
	"html/template"
	"net/http"

	"cc.tiredsysadmin.keeporg/internal/store"
)

// The administration pages. Each control is its own small form carrying the
// session's CSRF token and one action, which is why there is no JavaScript
// here and no way to act on a page you were not served.

var groupsTmpl = template.Must(template.Must(pages.Clone()).Parse(`
{{define "body"}}
<h1>Groups</h1>
<p class="sub">Nested groups decide who reaches which vault.</p>
{{if .Error}}<p class="err">{{.Error}}</p>{{end}}
{{if .Notice}}<p class="ok">{{.Notice}}</p>{{end}}
{{if .Groups}}
<div class="scroll"><table>
<thead><tr><th>Group</th><th>People</th><th>Vaults</th><th></th></tr></thead>
<tbody>
{{range .Groups}}<tr>
  <td class="name" style="padding-left:{{.Pad}}px"><a href="/web/groups/{{.ID}}">{{.Name}}</a></td>
  <td>{{.Members}}</td>
  <td>{{.Owns}}</td>
  <td>{{if .Admin}}<span class="tag">you administer</span>{{end}}</td>
</tr>{{end}}
</tbody></table></div>
{{else}}
<p class="empty">There are no groups you can see.</p>
{{end}}

{{if or .Parents .ServerAdmin}}
<fieldset><legend>New group</legend>
<form class="inline" method="post" action="/web/groups">
<input type="hidden" name="csrf" value="{{.CSRF}}">
<div><label for="name">Name</label>
<input id="name" name="name" required placeholder="Engineering"></div>
<div><label for="parent">Inside</label>
<select id="parent" name="parent">
{{if .ServerAdmin}}<option value="">(top level)</option>{{end}}
{{range .Parents}}<option value="{{.ID}}">{{.Name}}</option>{{end}}
</select></div>
<button type="submit">Create group</button>
</form>
<p class="note">Access flows downwards: a vault granted to a group is reachable by
every group inside it, and whoever administers a group administers everything
inside it too.</p>
</fieldset>
{{end}}
{{end}}`))

var groupTmpl = template.Must(template.Must(pages.Clone()).Parse(`
{{define "body"}}
{{with .G}}
<h1>{{.Name}}</h1>
<p class="sub">{{if .Parent}}Inside {{.Parent}}. {{end}}<a href="/web/groups">All groups</a></p>
{{end}}
{{if .Error}}<p class="err">{{.Error}}</p>{{end}}
{{if .Notice}}<p class="ok">{{.Notice}}</p>{{end}}
{{with .G}}
<h2>People</h2>
{{if .Members}}
<div class="scroll"><table>
<thead><tr><th>Who</th><th>Role</th><th></th></tr></thead>
<tbody>
{{range .Members}}<tr{{if .Disabled}} class="gone"{{end}}>
  <td class="name">{{.Username}}{{if .Disabled}} <span class="tag">disabled</span>{{end}}</td>
  <td>{{.Role}}</td>
  <td>{{if $.G.Admin}}
    <form method="post" action="/web/groups/{{$.G.ID}}">
      <input type="hidden" name="csrf" value="{{$.CSRF}}">
      <input type="hidden" name="action" value="member">
      <input type="hidden" name="user" value="{{.ID}}">
      <input type="hidden" name="role" value="{{if eq .Role "admin"}}member{{else}}admin{{end}}">
      <button type="submit">Make {{if eq .Role "admin"}}member{{else}}admin{{end}}</button>
    </form>
    <form method="post" action="/web/groups/{{$.G.ID}}">
      <input type="hidden" name="csrf" value="{{$.CSRF}}">
      <input type="hidden" name="action" value="member-remove">
      <input type="hidden" name="user" value="{{.ID}}">
      <button class="danger" type="submit">Remove</button>
    </form>
  {{end}}</td>
</tr>{{end}}
</tbody></table></div>
{{else}}<p class="empty">Nobody is in this group yet.</p>{{end}}

{{if .Admin}}
<fieldset><legend>Add somebody</legend>
<form class="inline" method="post" action="/web/groups/{{.ID}}">
<input type="hidden" name="csrf" value="{{$.CSRF}}">
<input type="hidden" name="action" value="member">
<div><label for="user">Username</label>
<input id="user" name="user" list="people" required autocomplete="off">
<datalist id="people">{{range .People}}<option value="{{.Name}}">{{end}}</datalist></div>
<div><label for="role">Role</label>
<select id="role" name="role">
  <option value="member">Member</option>
  <option value="admin">Administrator of this group</option>
</select></div>
<button type="submit">Add</button>
</form>
<p class="note">Only accounts that already exist can be added. To bring in somebody
new, send them an <a href="/web/invites">invite link</a> for this group.</p>
</fieldset>
{{end}}

<h2>Vaults this group reaches</h2>
{{if .Access}}
<div class="scroll"><table>
<thead><tr><th>Vault</th><th>Access</th><th>Where from</th><th></th></tr></thead>
<tbody>
{{range .Access}}<tr>
  <td class="name">{{.Name}}.kdbx</td>
  <td>{{.Perm}}</td>
  <td>{{if .Owned}}owns it{{else if .Via}}granted to {{.Via}}{{else}}granted here{{end}}</td>
  <td>{{if and $.G.Admin (not .Owned) (not .Via)}}
    <form method="post" action="/web/groups/{{$.G.ID}}">
      <input type="hidden" name="csrf" value="{{$.CSRF}}">
      <input type="hidden" name="action" value="grant-remove">
      <input type="hidden" name="database" value="{{.DatabaseID}}">
      <button class="danger" type="submit">Revoke</button>
    </form>
  {{end}}</td>
</tr>{{end}}
</tbody></table></div>
{{else}}<p class="empty">This group reaches no vaults.</p>{{end}}

{{if and .Admin .Vaults}}
<fieldset><legend>Grant access</legend>
<form class="inline" method="post" action="/web/groups/{{.ID}}">
<input type="hidden" name="csrf" value="{{$.CSRF}}">
<input type="hidden" name="action" value="grant">
<div><label for="database">Vault</label>
<select id="database" name="database" required>
{{range .Vaults}}<option value="{{.ID}}">{{.Name}}</option>{{end}}
</select></div>
<div><label for="perm">May</label>
<select id="perm" name="perm">
  <option value="read">Read it</option>
  <option value="write">Read and save it</option>
  <option value="admin">Administer it</option>
</select></div>
<button type="submit">Grant</button>
</form>
</fieldset>
{{end}}

{{if .Children}}
<h2>Groups inside this one</h2>
<div class="scroll"><table><tbody>
{{range .Children}}<tr>
  <td class="name"><a href="/web/groups/{{.ID}}">{{.Name}}</a></td>
  <td>{{.Members}} people</td><td>{{.Owns}} vaults</td>
</tr>{{end}}
</tbody></table></div>
{{end}}

{{if .Admin}}
<details>
<summary>Delete this group</summary>
<p class="sub">A group can only go once it has no members, no child groups and owns
no vaults. Deleting it also drops the grants that hang on it.</p>
<form method="post" action="/web/groups/{{.ID}}">
<input type="hidden" name="csrf" value="{{$.CSRF}}">
<input type="hidden" name="action" value="delete">
<button type="submit">Delete {{.Name}}</button>
</form>
</details>
{{end}}
{{end}}
{{end}}`))

var usersTmpl = template.Must(template.Must(pages.Clone()).Parse(`
{{define "body"}}
<h1>People</h1>
<p class="sub">{{if .ServerAdmin}}Every account on this server.{{else}}The people in the
groups you administer.{{end}}</p>
{{if .Error}}<p class="err">{{.Error}}</p>{{end}}
{{if .Notice}}<p class="ok">{{.Notice}}</p>{{end}}
<div class="scroll"><table>
<thead><tr><th>Who</th><th>Signs in with</th><th>Groups</th>{{if .ServerAdmin}}<th></th>{{end}}</tr></thead>
<tbody>
{{range .Users}}<tr{{if .Disabled}} class="gone"{{end}}>
  <td class="name">{{.Username}}
    {{if .ServerAdmin}}<span class="tag">server admin</span>{{end}}
    {{if .Disabled}}<span class="tag">disabled</span>{{end}}
    {{if .Email}}<br><small>{{.Email}}</small>{{end}}</td>
  <td>{{.SignIn}}{{if .TOTP}}<br><small>one-time code</small>{{end}}</td>
  <td>{{if .Groups}}{{.Groups}}{{else}}<small>none</small>{{end}}</td>
  {{if $.ServerAdmin}}<td>
    {{if .Disabled}}
    <form method="post" action="/web/users">
      <input type="hidden" name="csrf" value="{{$.CSRF}}">
      <input type="hidden" name="user" value="{{.ID}}">
      <input type="hidden" name="action" value="enable">
      <button type="submit">Enable</button>
    </form>
    {{else if not .Self}}
    <form method="post" action="/web/users">
      <input type="hidden" name="csrf" value="{{$.CSRF}}">
      <input type="hidden" name="user" value="{{.ID}}">
      <input type="hidden" name="action" value="disable">
      <button type="submit">Disable</button>
    </form>
    {{end}}
    {{if .TOTP}}
    <form method="post" action="/web/users">
      <input type="hidden" name="csrf" value="{{$.CSRF}}">
      <input type="hidden" name="user" value="{{.ID}}">
      <input type="hidden" name="action" value="clear-totp">
      <button type="submit">Clear 2FA</button>
    </form>
    {{end}}
    {{if not .Self}}
    <form method="post" action="/web/users">
      <input type="hidden" name="csrf" value="{{$.CSRF}}">
      <input type="hidden" name="user" value="{{.ID}}">
      <input type="hidden" name="action" value="{{if .ServerAdmin}}demote{{else}}promote{{end}}">
      <button type="submit">{{if .ServerAdmin}}Drop server admin{{else}}Make server admin{{end}}</button>
    </form>
    <form method="post" action="/web/users">
      <input type="hidden" name="csrf" value="{{$.CSRF}}">
      <input type="hidden" name="user" value="{{.ID}}">
      <input type="hidden" name="action" value="delete">
      <button class="danger" type="submit">Delete</button>
    </form>
    {{end}}
  </td>{{end}}
</tr>{{end}}
</tbody></table></div>
{{if .ServerAdmin}}
<p class="note">Disabling an account signs it out everywhere and keeps its history;
deleting it removes the account and its group memberships. Clearing the second
factor is what you do when somebody loses their phone — they can sign in with
their password alone until they enrol a new one.</p>
{{else}}
<p class="note">Only a server administrator can change an account. You decide who
is in your groups, from each <a href="/web/groups">group's page</a>.</p>
{{end}}
{{end}}`))

var invitesTmpl = template.Must(template.Must(pages.Clone()).Parse(`
{{define "body"}}
<h1>Invites</h1>
<p class="sub">An invite link lets somebody create their own account and lands them
in one group.</p>
{{if .Error}}<p class="err">{{.Error}}</p>{{end}}
{{if .Notice}}<p class="ok">{{.Notice}}</p>{{end}}
{{if .Invites}}
<div class="scroll"><table>
<thead><tr><th>Link</th><th>Joins</th><th>Used</th><th>Expires</th><th></th></tr></thead>
<tbody>
{{range .Invites}}<tr{{if .Expired}} class="gone"{{end}}>
  <td><input readonly value="{{.URL}}" aria-label="invite link"></td>
  <td>{{.Group}}<br><small>as {{.Role}}</small></td>
  <td>{{.Uses}} of {{.Max}}</td>
  <td>{{.Expires}}{{if .Expired}}<br><small>spent or expired</small>{{end}}
    {{if .By}}<br><small>by {{.By}}</small>{{end}}</td>
  <td>
    <form method="post" action="/web/invites">
      <input type="hidden" name="csrf" value="{{$.CSRF}}">
      <input type="hidden" name="action" value="revoke">
      <input type="hidden" name="token" value="{{.Token}}">
      <button class="danger" type="submit">Revoke</button>
    </form>
  </td>
</tr>{{end}}
</tbody></table></div>
{{else}}
<p class="empty">No invites outstanding.</p>
{{end}}

{{if or .Groups .ServerAdmin}}
<fieldset><legend>New invite</legend>
<form class="inline" method="post" action="/web/invites">
<input type="hidden" name="csrf" value="{{.CSRF}}">
<input type="hidden" name="action" value="create">
<div><label for="group">Joins</label>
<select id="group" name="group">
{{range .Groups}}<option value="{{.ID}}">{{.Name}}</option>{{end}}
{{if .ServerAdmin}}<option value="">(no group)</option>{{end}}
</select></div>
<div><label for="role">As</label>
<select id="role" name="role">
  <option value="member">Member</option>
  <option value="admin">Administrator of that group</option>
</select></div>
<div><label for="ttl">Valid for</label>
<select id="ttl" name="ttl">
  <option value="1">1 hour</option>
  <option value="24">1 day</option>
  <option value="168" selected>7 days</option>
  <option value="720">30 days</option>
</select></div>
<div><label for="uses">Uses</label>
<select id="uses" name="uses">
  <option value="1">1</option>
  <option value="5">5</option>
  <option value="25">25</option>
  <option value="-1">unlimited</option>
</select></div>
<button type="submit">Create invite</button>
</form>
<p class="note">Anyone holding the link can create an account, so send it the way you
would send a password and keep it short-lived. Revoking a link stops it at once.</p>
</fieldset>
{{end}}
{{end}}`))

func (s *Server) renderGroups(w http.ResponseWriter, sess *webSession, errMsg, notice string) {
	d := s.shell(sess, "Groups", "Groups")
	s.st.Read(func(st *store.State) {
		d["Groups"] = groupTree(st, sess.user)
		d["Parents"] = administeredGroups(st, sess.user)
	})
	d["Error"], d["Notice"] = errMsg, notice
	render(w, groupsTmpl, d)
}

func (s *Server) renderGroup(w http.ResponseWriter, sess *webSession, id, errMsg, notice string) {
	d := s.shell(sess, "Group", "Groups")
	var detail *webGroupDetail
	s.st.Read(func(st *store.State) { detail = groupDetail(st, sess.user, id) })
	if detail == nil {
		s.renderGroups(w, sess, "There is no such group, or it is not yours to see.", "")
		return
	}
	d["G"], d["Error"], d["Notice"] = detail, errMsg, notice
	render(w, groupTmpl, d)
}

func (s *Server) renderUsers(w http.ResponseWriter, sess *webSession, errMsg, notice string) {
	d := s.shell(sess, "People", "People")
	s.st.Read(func(st *store.State) { d["Users"] = userRows(st, sess.user) })
	d["Error"], d["Notice"] = errMsg, notice
	render(w, usersTmpl, d)
}

func (s *Server) renderInvites(w http.ResponseWriter, sess *webSession, errMsg, notice string) {
	d := s.shell(sess, "Invites", "Invites")
	s.st.Read(func(st *store.State) {
		d["Invites"] = s.inviteRows(st, sess.user)
		d["Groups"] = administeredGroups(st, sess.user)
	})
	d["Error"], d["Notice"] = errMsg, notice
	render(w, invitesTmpl, d)
}