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diff --git a/include/offers.php b/include/offers.php
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+<?php
+/**
+ * BusinessAdmin: administrative software for small companies
+ * Copyright (C) 2015 Camil Staps (ViviSoft)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+require_once('./index.php');
+require('./header.php');
+?>
+
+<div id="wrapper">
+
+	<?php require('./nav.php'); ?>
+
+	<div id="page-wrapper">
+		<div class="row">
+			<?php
+			//------------------------------------------------------------------------------
+			// Check for GET variables
+			//
+			// ?id=<id>           			View information of the offer with id <id>
+			// ?toggle_accept=<id> 			Toggle the accepted status of the offer with id <id>
+			// ?generate_invoice=<id> 	Generate an invoice for the offer with id <id>
+			// ?trash_invoice=<id>			Trash the invoice file
+			// ?delete=<id>       			Delete the offer with id <id>
+			//------------------------------------------------------------------------------
+
+			// The header of the page
+			$header = 'Offers';
+			// Whether or not to show an individual offer in the end (false if not, or the id if yes)
+			$show_individual = false;
+
+			// View offer
+			if (isset($_GET['id'])) {
+				$id = (int) $_GET['id'];
+				try {
+					$offer = new offer($_pdo, $id);
+					$header = "<a href='".constants::url_external."offers'>Offers</a> / #{$offer->getId()}";
+					$show_individual = $id;
+				} catch (PDOException $e) {
+					$alert = "<div class='alert alert-danger alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The offer with id $id</i> could not be found.</div>";
+				} catch (Exception $e) {
+					$alert = "<div class='alert alert-warning alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The offer with id $id</i> could not be found.</div>";
+				}
+			}
+
+			// Show the header
+			echo "<div class='col-lg-12'><h1 class='page-header'>$header</h1></div>";
+			if (isset($alert)) echo "<div class='col-lg-12'>$alert</div>";
+
+			// Accept offer
+			if (isset($_GET['toggle_accept'])) {
+				echo "<div class='col-lg-12'>";
+				$id = (int) $_GET['toggle_accept'];
+				try {
+					$offer = new offer($_pdo, $id);
+					if ($offer->toggleAccepted()) {
+						echo "<div class='alert alert-success alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The status offer #{$offer->getId()} has been set to <i>".($offer->isAccepted() ? "accepted" : "unaccepted")."</i>.</div>";
+					} else {
+						echo "<div class='alert alert-warning alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The status of the offer #{$offer->getId()} could not be changed.</div>";
+					}
+				} catch (PDOException $e) {
+					echo "<div class='alert alert-danger alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The status of the offer could not be changed due to a PDO error.</div>";
+				} catch (Exception $e) {
+					echo "<div class='alert alert-warning alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The offer with id {$id} could not be found.</div>";
+				}
+
+				echo "</div>";
+			}
+
+			// Generate invoice
+			if (isset($_GET['generate_invoice'])) {
+				echo "<div class='col-lg-12'>";
+				$id = (int) $_GET['generate_invoice'];
+				try {
+					$offer = new offer($_pdo, $id);
+					$file = $offer->generateInvoice();
+					echo "<div class='alert alert-success alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The invoice for offer #{$offer->getId()} is generated: <a class='alert-link' href='{$file->getFilenameURI()}' target='_blank'>{$file->getFilename()}</a></div>";
+				} catch (PDOException $e) {
+					echo "<div class='alert alert-danger alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The invoice for offer #{$offer->getId()} could not be generated due to a PDO error.</div>";
+				} catch (Exception $e) {
+					echo "<div class='alert alert-danger alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The invoice for offer #{$id} could not be generated.</div>";
+				}
+				echo "</div>";
+			}
+
+			// Trash invoice
+			if (isset($_GET['trash_invoice'])) {
+				echo "<div class='col-lg-12'>";
+				$id = (int) $_GET['trash_invoice'];
+				try {
+					$offer = new offer($_pdo, $id);
+					$file = $offer->getInvoiceFile();
+					if ($file instanceof file && $file->delete()) {
+						echo "<div class='alert alert-success alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The invoice for offer #{$offer->getId()} is trashed.</div>";
+					} else {
+						echo "<div class='alert alert-danger alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The invoice for offer #{$id} could not be trashed.</div>";
+					}
+				} catch (PDOException $e) {
+					echo "<div class='alert alert-danger alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The invoice for offer #{$offer->getId()} could not be trashed due to a PDO error.</div>";
+				} catch (Exception $e) {
+						echo "<div class='alert alert-danger alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The invoice for offer #{$id} could not be trashed.</div>";
+				}
+				echo "</div>";
+			}
+
+			// Delete offer
+			if (isset($_GET['delete'])) {
+				echo "<div class='col-lg-12'>";
+				$id = (int) $_GET['delete'];
+				try {
+					$offer = new offer($_pdo, $id);
+					if ($offer->delete()) {
+						echo "<div class='alert alert-success alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The offer #{$offer->getId()} has been removed.</div>";
+					} else {
+						echo "<div class='alert alert-warning alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The offer #{$offer->getId()} could not be removed. Perhaps it's already removed?</div>";
+					}
+				} catch (PDOException $e) {
+					echo "<div class='alert alert-danger alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The offer could not be removed due to a PDO error.</div>";
+				} catch (Exception $e) {
+					echo "<div class='alert alert-warning alert-dismissable'><button type='button' class='close fa fa-times' data-dismiss='alert' aria-hidden='true'></button>The offer with id {$id} could not be found.</div>";
+				}
+
+				echo "</div>";
+			}
+
+			if ($show_individual !== false) {
+				$_id = $show_individual;
+				require('offers-view.php');
+			} else {
+				require('offers-overview.php');
+			}
+			?>
+		</div>
+		<!-- /.row -->
+	</div>
+	<!-- /#page-wrapper -->
+
+</div>
+<!-- /#wrapper -->
+
+<?php
+require('./footer.php');
+?>
\ No newline at end of file