<?php
declare(strict_types=1);
require_once __DIR__ . '/db/config.php';

$tenant_id = 1; 

// Handle Bulk Labour
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['bulk_labour'])) {
    $project_id = (int)($_POST['bulk_project_id'] ?? 0);
    $employee_id = (int)($_POST['bulk_employee_id'] ?? 0);
    $labour_type_id = (int)($_POST['bulk_labour_type_id'] ?? 0);
    $evidence_type_id = (int)($_POST['bulk_evidence_type_id'] ?? 0);
    $notes = $_POST['bulk_notes'] ?? '';
    
    $days = $_POST['bulk_days'] ?? []; // Array of date => hours

    if ($project_id && $employee_id && !empty($days)) {
        $db = db();
        foreach ($days as $date => $hours) {
            $hours = (float)$hours;
            if ($hours <= 0) continue;
            
            $stmt = $db->prepare("INSERT INTO labour_entries (tenant_id, project_id, employee_id, entry_date, hours, labour_type_id, evidence_type_id, notes) VALUES (?, ?, ?, ?, ?, ?, ?, ?)");
            $stmt->execute([$tenant_id, $project_id, $employee_id, $date, $hours, $labour_type_id, $evidence_type_id, $notes]);
        }

        $stmt = $db->prepare("INSERT INTO activity_log (tenant_id, action, details) VALUES (?, ?, ?)");
        $stmt->execute([$tenant_id, 'Bulk Labour Added', "Logged hours for employee ID $employee_id via bulk entry"]);

        header("Location: labour.php?success=1");
        exit;
    }
}
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['add_labour'])) {
    $project_id = (int)($_POST['project_id'] ?? 0);
    $employee_ids = isset($_POST['employee_ids']) ? array_map('intval', $_POST['employee_ids']) : [];
    if (empty($employee_ids) && isset($_POST['employee_id'])) {
        $employee_ids = [(int)$_POST['employee_id']];
    }
    
    $entry_date = $_POST['entry_date'] ?? date('Y-m-d');
    $hours = (float)($_POST['hours'] ?? 0);
    $labour_type_id = (int)($_POST['labour_type_id'] ?? 0);
    $evidence_type_id = (int)($_POST['evidence_type_id'] ?? 0);
    $notes = $_POST['notes'] ?? '';

    if ($project_id && !empty($employee_ids) && $hours > 0) {
        $db = db();
        foreach ($employee_ids as $employee_id) {
            $stmt = $db->prepare("INSERT INTO labour_entries (tenant_id, project_id, employee_id, entry_date, hours, labour_type_id, evidence_type_id, notes) VALUES (?, ?, ?, ?, ?, ?, ?, ?)");
            $stmt->execute([$tenant_id, $project_id, $employee_id, $entry_date, $hours, $labour_type_id, $evidence_type_id, $notes]);
            $labour_entry_id = (int)$db->lastInsertId();

            // Handle File Uploads (only for the first one or all? Usually all if it's a team entry)
            if (!empty($_FILES['attachments']['name'][0])) {
                foreach ($_FILES['attachments']['tmp_name'] as $key => $tmp_name) {
                    if ($_FILES['attachments']['error'][$key] === UPLOAD_ERR_OK) {
                        $file_name = $_FILES['attachments']['name'][$key];
                        $file_size = $_FILES['attachments']['size'][$key];
                        $mime_type = $_FILES['attachments']['type'][$key];
                        $file_ext = pathinfo($file_name, PATHINFO_EXTENSION);
                        $new_file_name = uniqid() . '.' . $file_ext;
                        $file_path = 'uploads/' . $new_file_name;

                        if (!is_dir('uploads')) mkdir('uploads', 0775, true);
                        if (move_uploaded_file($tmp_name, $file_path)) {
                            $stmt = $db->prepare("INSERT INTO attachments (tenant_id, entity_type, entity_id, file_name, file_path, file_size, mime_type, uploaded_by) VALUES (?, 'labour_entry', ?, ?, ?, ?, ?, ?)");
                            $stmt->execute([$tenant_id, $labour_entry_id, $file_name, $file_path, $file_size, $mime_type, $currentUserName]);
                        }

                    }
                }
            }
        }

        $stmt = $db->prepare("INSERT INTO activity_log (tenant_id, action, details) VALUES (?, ?, ?)");
        $stmt->execute([$tenant_id, 'Labour Added', "Logged $hours hours for " . count($employee_ids) . " employee(s)"]);

        header("Location: labour.php?success=1");
        exit;
    }
}

// Fetch Data
$labourEntries = db()->prepare("
    SELECT le.*, p.name as project_name, e.name as employee_name, lt.name as labour_type, et.name as evidence_type
    FROM labour_entries le
    JOIN projects p ON le.project_id = p.id
    JOIN employees e ON le.employee_id = e.id
    LEFT JOIN labour_types lt ON le.labour_type_id = lt.id
    LEFT JOIN evidence_types et ON le.evidence_type_id = et.id
    WHERE le.tenant_id = ?
    ORDER BY le.entry_date DESC, le.created_at DESC
");
$labourEntries->execute([$tenant_id]);
$labourList = $labourEntries->fetchAll();

$projects = db()->prepare("SELECT id, name FROM projects WHERE tenant_id = ? AND is_archived = 0 ORDER BY name");
$projects->execute([$tenant_id]);
$projectList = $projects->fetchAll();

$employees = db()->prepare("SELECT id, first_name, last_name FROM employees WHERE tenant_id = ? ORDER BY first_name, last_name");
$employees->execute([$tenant_id]);
$employeeList = $employees->fetchAll();

$labourTypes = db()->prepare("SELECT * FROM labour_types WHERE tenant_id = ? ORDER BY name");
$labourTypes->execute([$tenant_id]);
$labourTypeList = $labourTypes->fetchAll();

$evidenceTypes = db()->prepare("SELECT * FROM evidence_types WHERE tenant_id = ? ORDER BY name");
$evidenceTypes->execute([$tenant_id]);
$evidenceTypeList = $evidenceTypes->fetchAll();

// Find current employee (mocked as user_id 1)
$currentUser = db()->prepare("SELECT name FROM users WHERE id = 1");
$currentUser->execute();
$currentUserName = $currentUser->fetchColumn() ?: 'System';

$currentEmployeeStmt = db()->prepare("SELECT id FROM employees WHERE user_id = 1 AND tenant_id = ?");
$currentEmployeeStmt->execute([$tenant_id]);
$currentEmployeeId = $currentEmployeeStmt->fetchColumn() ?: null;

$teams = db()->prepare("SELECT * FROM teams WHERE tenant_id = ? ORDER BY name");
$teams->execute([$tenant_id]);
$teamList = $teams->fetchAll();

$teamMembers = db()->prepare("SELECT * FROM employee_teams WHERE tenant_id = ?");
$teamMembers->execute([$tenant_id]);
$teamMemberList = $teamMembers->fetchAll();
// Group by team
$teamMembersGrouped = [];
foreach ($teamMemberList as $tm) {
    $teamMembersGrouped[$tm['team_id']][] = $tm['employee_id'];
}

$pageTitle = "SR&ED Manager - Labour Tracking";
include __DIR__ . '/includes/header.php';
?>

<div class="container-fluid py-4">
    <div class="d-flex justify-content-between align-items-center mb-4">
        <h2 class="fw-bold mb-0">Labour Tracking</h2>
        <div>
            <button class="btn btn-outline-primary me-2" data-bs-toggle="modal" data-bs-target="#bulkLabourModal"><i class="bi bi-calendar3 me-1"></i> Bulk Add</button>
            <button class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#addLabourModal">+ Add Labour Entry</button>
        </div>
    </div>

    <?php if (isset($_GET['success'])): ?>
        <div class="alert alert-success alert-dismissible fade show border-0 shadow-sm mb-4" role="alert">
            Labour entry successfully saved.
            <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
        </div>
    <?php endif; ?>

    <div class="card border-0 shadow-sm">
        <div class="table-responsive">
            <table class="table align-middle mb-0">
                <thead class="bg-light">
                    <tr>
                        <th>Date</th>
                        <th>Employee</th>
                        <th>Project</th>
                        <th>Hours</th>
                        <th>Type / Evidence</th>
                        <th>Notes</th>
                        <th class="text-end">Actions</th>
                    </tr>
                </thead>
                <tbody>
                    <?php if (empty($labourList)): ?>
                        <tr><td colspan="7" class="text-center py-5 text-muted">No labour entries found.</td></tr>
                    <?php endif; ?>
                    <?php foreach ($labourList as $l): ?>
                    <tr>
                        <td class="text-muted"><?= $l['entry_date'] ?></td>
                        <td><strong><?= htmlspecialchars($l['employee_name']) ?></strong></td>
                        <td><?= htmlspecialchars($l['project_name']) ?></td>
                        <td><span class="badge bg-light text-primary border"><?= number_format((float)$l['hours'], 2) ?> h</span></td>
                        <td>
                            <div class="small fw-bold"><?= htmlspecialchars($l['labour_type'] ?? 'N/A') ?></div>
                            <div class="extra-small text-muted"><?= htmlspecialchars($l['evidence_type'] ?? 'N/A') ?></div>
                        </td>
                        <td class="small text-muted"><?= htmlspecialchars($l['notes'] ?? '') ?></td>
                        <td class="text-end">
                            <button class="btn btn-sm btn-outline-secondary">Details</button>
                        </td>
                    </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
        </div>
    </div>
</div>

<!-- Modal -->
<div class="modal fade" id="addLabourModal" tabindex="-1">
    <div class="modal-dialog modal-lg modal-dialog-centered">
        <div class="modal-content border-0 shadow">
            <div class="modal-header">
                <h5 class="modal-title fw-bold">Add Labour Entry</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
            </div>
            <form method="POST" enctype="multipart/form-data">
                <div class="modal-body">
                    <div class="row">
                        <div class="col-12 mb-4">
                            <label class="form-label small fw-bold d-block">Entry Mode</label>
                            <div class="btn-group w-100" role="group">
                                <input type="radio" class="btn-check" name="entry_mode" id="modeIndividual" value="individual" checked autocomplete="off">
                                <label class="btn btn-outline-primary" for="modeIndividual">Individual</label>
                                
                                <input type="radio" class="btn-check" name="entry_mode" id="modeTeam" value="team" autocomplete="off">
                                <label class="btn btn-outline-primary" for="modeTeam">Team</label>
                            </div>
                        </div>
                        
                        <div class="col-md-12 mb-3" id="individualSelect">
                            <label class="form-label small fw-bold">Employee</label>
                            <select name="employee_id" class="form-select">
                                <option value="">Select Employee...</option>
                                <?php foreach ($employeeList as $e): ?>
                                    <option value="<?= $e['id'] ?>" <?= $e['id'] == $currentEmployeeId ? 'selected' : '' ?>><?= htmlspecialchars($e['first_name'] . ' ' . $e['last_name']) ?></option>
                                <?php endforeach; ?>
                            </select>
                        </div>

                        <div id="teamSelect" style="display: none;" class="col-12">
                            <div class="row">
                                <div class="col-md-12 mb-3">
                                    <label class="form-label small fw-bold">Select Team</label>
                                    <select id="teamIdSelect" class="form-select mb-3">
                                        <option value="">Select Team...</option>
                                        <?php foreach ($teamList as $t): ?>
                                            <option value="<?= $t['id'] ?>"><?= htmlspecialchars($t['name']) ?></option>
                                        <?php endforeach; ?>
                                    </select>
                                </div>
                                <div class="col-md-12 mb-3">
                                    <label class="form-label small fw-bold d-block">Team Members</label>
                                    <div id="teamMembersList" class="p-3 border rounded bg-light" style="max-height: 200px; overflow-y: auto;">
                                        <p class="text-muted small mb-0">Select a team to see members</p>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <div class="col-md-12 mb-3">
                            <label class="form-label small fw-bold">Project</label>
                            <select name="project_id" class="form-select" required>
                                <option value="">Select Project...</option>
                                <?php foreach ($projectList as $p): ?>
                                    <option value="<?= $p['id'] ?>"><?= htmlspecialchars($p['name']) ?></option>
                                <?php endforeach; ?>
                            </select>
                        </div>
                        <div class="col-md-6 mb-3">
                            <label class="form-label small fw-bold">Date</label>
                            <input type="date" name="entry_date" class="form-control" value="<?= date('Y-m-d') ?>" required>
                        </div>
                        <div class="col-md-6 mb-3">
                            <label class="form-label small fw-bold">Hours</label>
                            <input type="number" name="hours" class="form-control" step="0.25" min="0" required>
                        </div>
                        <div class="col-md-6 mb-3">
                            <label class="form-label small fw-bold">Type of Labour</label>
                            <select name="labour_type_id" class="form-select">
                                <?php foreach ($labourTypeList as $lt): ?>
                                    <option value="<?= $lt['id'] ?>"><?= htmlspecialchars($lt['name']) ?></option>
                                <?php endforeach; ?>
                            </select>
                        </div>
                        <div class="col-md-6 mb-3">
                            <label class="form-label small fw-bold">Objective Evidence</label>
                            <select name="evidence_type_id" class="form-select">
                                <?php foreach ($evidenceTypeList as $et): ?>
                                    <option value="<?= $et['id'] ?>"><?= htmlspecialchars($et['name']) ?></option>
                                <?php endforeach; ?>
                            </select>
                        </div>
                        <div class="col-12 mb-3">
                            <label class="form-label small fw-bold">Attachments</label>
                            <input type="file" name="attachments[]" class="form-control" multiple>
                        </div>
                        <div class="col-12">
                            <label class="form-label small fw-bold">Notes</label>
                            <textarea name="notes" class="form-control" rows="2"></textarea>
                        </div>
                    </div>
                </div>
                <div class="modal-footer border-0">
                    <button type="submit" name="add_labour" class="btn btn-primary px-4">Save Entry</button>
                </div>
            </form>
        </div>
    </div>
</div>

<!-- Bulk Entry Modal -->
<div class="modal fade" id="bulkLabourModal" tabindex="-1">
    <div class="modal-dialog modal-xl modal-dialog-centered">
        <div class="modal-content border-0 shadow">
            <div class="modal-header">
                <h5 class="modal-title fw-bold">Bulk Labour Entry</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
            </div>
            <form method="POST">
                <div class="modal-body">
                    <div class="row g-4">
                        <div class="col-md-8">
                            <div class="d-flex justify-content-between align-items-center mb-3">
                                <h6 class="fw-bold mb-0">Weekly Timesheet</h6>
                                <div class="d-flex gap-2">
                                    <input type="week" id="bulkWeek" class="form-control form-control-sm" value="<?= date('Y-\WW') ?>">
                                </div>
                            </div>
                            
                            <div class="table-responsive">
                                <table class="table table-bordered text-center">
                                    <thead class="bg-light">
                                        <tr id="bulkHeader">
                                            <!-- To be populated by JS -->
                                        </tr>
                                    </thead>
                                    <tbody id="bulkBody">
                                        <!-- To be populated by JS -->
                                    </tbody>
                                </table>
                            </div>
                            <div id="existingHoursInfo" class="small text-muted mt-2"></div>
                        </div>
                        <div class="col-md-4">
                            <div class="card bg-light border-0">
                                <div class="card-body">
                                    <h6 class="fw-bold mb-3">Labour Details</h6>
                                    <div class="mb-3">
                                        <label class="form-label small fw-bold">Employee</label>
                                        <select name="bulk_employee_id" id="bulkEmployee" class="form-select form-select-sm" required>
                                            <option value="">Select Employee...</option>
                                            <?php foreach ($employeeList as $e): ?>
                                                <option value="<?= $e['id'] ?>" <?= $e['id'] == $currentEmployeeId ? 'selected' : '' ?>><?= htmlspecialchars($e['first_name'] . ' ' . $e['last_name']) ?></option>
                                            <?php endforeach; ?>
                                        </select>
                                    </div>
                                    <div class="mb-3">
                                        <label class="form-label small fw-bold">Project</label>
                                        <select name="bulk_project_id" id="bulkProject" class="form-select form-select-sm" required>
                                            <?php foreach ($projectList as $p): ?>
                                                <option value="<?= $p['id'] ?>"><?= htmlspecialchars($p['name']) ?></option>
                                            <?php endforeach; ?>
                                        </select>
                                    </div>
                                    <div class="mb-3">
                                        <label class="form-label small fw-bold">Labour Type</label>
                                        <select name="bulk_labour_type_id" class="form-select form-select-sm">
                                            <?php foreach ($labourTypeList as $lt): ?>
                                                <option value="<?= $lt['id'] ?>"><?= htmlspecialchars($lt['name']) ?></option>
                                            <?php endforeach; ?>
                                        </select>
                                    </div>
                                    <div class="mb-3">
                                        <label class="form-label small fw-bold">Evidence</label>
                                        <select name="bulk_evidence_type_id" class="form-select form-select-sm">
                                            <?php foreach ($evidenceTypeList as $et): ?>
                                                <option value="<?= $et['id'] ?>"><?= htmlspecialchars($et['name']) ?></option>
                                            <?php endforeach; ?>
                                        </select>
                                    </div>
                                    <div class="mb-0">
                                        <label class="form-label small fw-bold">Notes</label>
                                        <textarea name="bulk_notes" class="form-control form-control-sm" rows="2"></textarea>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="modal-footer border-0">
                    <button type="submit" name="bulk_labour" class="btn btn-primary px-4">Save All Entries</button>
                </div>
            </form>
        </div>
    </div>
</div>

<?php 
// Convert PHP arrays to JS for dynamic UI
$employeesJson = json_encode($employeeList);
$teamMembersJson = json_encode($teamMembersGrouped);
?>
<script>
const employees = <?= $employeesJson ?>;
const teamMembersGrouped = <?= $teamMembersJson ?>;

document.addEventListener('DOMContentLoaded', function() {
    const modeIndividual = document.getElementById('modeIndividual');
    const modeTeam = document.getElementById('modeTeam');
    const individualSelect = document.getElementById('individualSelect');
    const teamSelect = document.getElementById('teamSelect');
    const teamIdSelect = document.getElementById('teamIdSelect');
    const teamMembersList = document.getElementById('teamMembersList');

    function toggleMode() {
        if (modeIndividual.checked) {
            individualSelect.style.display = 'block';
            teamSelect.style.display = 'none';
            individualSelect.querySelector('select').required = true;
        } else {
            individualSelect.style.display = 'none';
            teamSelect.style.display = 'block';
            individualSelect.querySelector('select').required = false;
        }
    }

    modeIndividual.addEventListener('change', toggleMode);
    modeTeam.addEventListener('change', toggleMode);

    teamIdSelect.addEventListener('change', function() {
        const teamId = this.value;
        teamMembersList.innerHTML = '';
        
        if (teamId && teamMembersGrouped[teamId]) {
            const members = teamMembersGrouped[teamId];
            members.forEach(empId => {
                const emp = employees.find(e => e.id == empId);
                if (emp) {
                    const div = document.createElement('div');
                    div.className = 'form-check';
                    div.innerHTML = `
                        <input class="form-check-input" type="checkbox" name="employee_ids[]" value="${emp.id}" id="emp_${emp.id}" checked>
                        <label class="form-check-label" for="emp_${emp.id}">
                            ${emp.first_name} ${emp.last_name}
                        </label>
                    `;
                    teamMembersList.appendChild(div);
                }
            });
        } else {
            teamMembersList.innerHTML = '<p class="text-muted small mb-0">Select a team to see members</p>';
        }
    });

    // Bulk Entry Logic
    const bulkWeek = document.getElementById('bulkWeek');
    const bulkHeader = document.getElementById('bulkHeader');
    const bulkBody = document.getElementById('bulkBody');
    const bulkEmployee = document.getElementById('bulkEmployee');
    const existingHoursInfo = document.getElementById('existingHoursInfo');

    function updateBulkView() {
        const weekStr = bulkWeek.value;
        if (!weekStr) return;

        const [year, week] = weekStr.split('-W').map(Number);
        const startDate = getStartDateOfWeek(week, year);
        
        bulkHeader.innerHTML = '';
        bulkBody.innerHTML = '<tr>';
        
        const days = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
        const dates = [];

        for (let i = 0; i < 7; i++) {
            const d = new Date(startDate);
            d.setDate(startDate.getDate() + i);
            const dateStr = d.toISOString().split('T')[0];
            dates.push(dateStr);

            const th = document.createElement('th');
            th.innerHTML = `${days[i]}<br><small class="fw-normal text-muted">${d.getMonth() + 1}/${d.getDate()}</small>`;
            bulkHeader.appendChild(th);

            const td = document.createElement('td');
            td.innerHTML = `
                <input type="number" name="bulk_days[${dateStr}]" class="form-control text-center bulk-hour-input" step="0.5" min="0" placeholder="0">
                <div class="extra-small text-muted mt-1 existing-hours" data-date="${dateStr}"></div>
            `;
            bulkBody.appendChild(td);
        }
        bulkBody.innerHTML += '</tr>';

        fetchExistingHours(dates[0], dates[6]);
    }

    function getStartDateOfWeek(w, y) {
        const d = new Date(y, 0, 1 + (w - 1) * 7);
        const dow = d.getDay();
        const ISOweekStart = d;
        if (dow <= 4)
            ISOweekStart.setDate(d.getDate() - d.getDay());
        else
            ISOweekStart.setDate(d.getDate() + 8 - d.getDay());
        return ISOweekStart;
    }

    function fetchExistingHours(start, end) {
        const empId = bulkEmployee.value;
        if (!empId) return;

        fetch(`api/get_labour_stats.php?employee_id=${empId}&start_date=${start}&end_date=${end}`)
            .then(res => res.json())
            .then(data => {
                document.querySelectorAll('.existing-hours').forEach(el => {
                    const date = el.dataset.date;
                    const record = data.find(d => d.entry_date === date);
                    if (record) {
                        el.innerHTML = `Total: ${record.total_hours}h`;
                        el.classList.add('text-primary', 'fw-bold');
                    } else {
                        el.innerHTML = 'Total: 0h';
                        el.classList.remove('text-primary', 'fw-bold');
                    }
                });
            });
    }

    bulkWeek.addEventListener('change', updateBulkView);
    bulkEmployee.addEventListener('change', updateBulkView);
    
    // Initial update
    updateBulkView();
});
</script>

<?php include __DIR__ . '/includes/footer.php'; ?>