ScanLook/blueprints/counting.py

from flask import Blueprint, render_template, request, redirect, url_for, flash, jsonify, session
from db import query_db, execute_db, get_db
from utils import login_required

counting_bp = Blueprint('counting', __name__)
def get_active_session(session_id):
    """Get session if it exists and is not archived. Returns None if invalid."""
    sess = query_db('SELECT * FROM CountSessions WHERE session_id = ?', [session_id], one=True)
    if not sess or sess['status'] == 'archived':
        return None
    return sess

@counting_bp.route('/count/<int:session_id>')
@login_required
def count_session(session_id):
    """Select session and begin counting"""
    sess = query_db('SELECT * FROM CountSessions WHERE session_id = ? AND status = "active"', 
                    [session_id], one=True)
    
    if not sess:
        flash('Session not found or not active', 'danger')
        return redirect(url_for('dashboard'))
    
    # Redirect to my_counts page (staff can manage multiple bins)
    return redirect(url_for('counting.my_counts', session_id=session_id))


@counting_bp.route('/session/<int:session_id>/my-counts')
@login_required
def my_counts(session_id):
    """Staff view of their active and completed bins"""
    sess = query_db('SELECT * FROM CountSessions WHERE session_id = ?', [session_id], one=True)
    
    if not sess:
        flash('Session not found', 'danger')
        return redirect(url_for('dashboard'))
    
    if sess['status'] == 'archived':
        flash('This session has been archived', 'warning')
        return redirect(url_for('dashboard'))
    
    # Get this user's active bins
    active_bins = query_db('''
        SELECT lc.*, 
               COUNT(se.entry_id) as scan_count
        FROM LocationCounts lc
        LEFT JOIN ScanEntries se ON lc.location_count_id = se.location_count_id AND se.is_deleted = 0
        WHERE lc.session_id = ? 
        AND lc.counted_by = ?
        AND lc.status = 'in_progress'
        GROUP BY lc.location_count_id
        ORDER BY lc.start_timestamp DESC
    ''', [session_id, session['user_id']])
    
    # Get this user's completed bins
    completed_bins = query_db('''
        SELECT lc.*, 
               COUNT(se.entry_id) as scan_count
        FROM LocationCounts lc
        LEFT JOIN ScanEntries se ON lc.location_count_id = se.location_count_id AND se.is_deleted = 0
        WHERE lc.session_id = ? 
        AND lc.counted_by = ?
        AND lc.status = 'completed'
        GROUP BY lc.location_count_id
        ORDER BY lc.end_timestamp DESC
    ''', [session_id, session['user_id']])
    
    return render_template('my_counts.html',
                         count_session=sess,
                         active_bins=active_bins,
                         completed_bins=completed_bins)


@counting_bp.route('/session/<int:session_id>/start-bin', methods=['POST'])
@login_required
def start_bin_count(session_id):
    """Start counting a new bin"""
    sess = get_active_session(session_id)
    if not sess:
        flash('Session not found or archived', 'warning')
        return redirect(url_for('dashboard'))
    
    location_name = request.form.get('location_name', '').strip().upper()
    
    if not location_name:
        flash('Bin number is required', 'danger')
        return redirect(url_for('counting.my_counts', session_id=session_id))
    
    # Count expected lots from MASTER baseline for this location
    expected_lots = query_db('''
        SELECT COUNT(DISTINCT lot_number) as count
        FROM BaselineInventory_Master
        WHERE session_id = ? AND system_bin = ?
    ''', [session_id, location_name], one=True)
    
    expected_count = expected_lots['count'] if expected_lots else 0
    
    # Create new location count
    conn = get_db()
    cursor = conn.cursor()
    
    cursor.execute('''
        INSERT INTO LocationCounts (session_id, location_name, counted_by, status, start_timestamp, expected_lots_master)
        VALUES (?, ?, ?, 'in_progress', CURRENT_TIMESTAMP, ?)
    ''', [session_id, location_name, session['user_id'], expected_count])
    
    location_count_id = cursor.lastrowid
    conn.commit()
    conn.close()
    
    flash(f'Started counting bin: {location_name}', 'success')
    return redirect(url_for('counting.count_location', session_id=session_id, location_count_id=location_count_id))


@counting_bp.route('/location/<int:location_count_id>/complete', methods=['POST'])
@login_required
def complete_location(location_count_id):
    """Mark a location count as complete (Simple toggle)"""
    # Verify ownership
    loc = query_db('SELECT * FROM LocationCounts WHERE location_count_id = ?', [location_count_id], one=True)
    
    if not loc:
        return jsonify({'success': False, 'message': 'Location not found'})
    
    if loc['counted_by'] != session['user_id'] and session['role'] not in ['owner', 'admin']:
        return jsonify({'success': False, 'message': 'Permission denied'})
    
    # Mark as completed
    execute_db('''
        UPDATE LocationCounts
        SET status = 'completed', end_timestamp = CURRENT_TIMESTAMP
        WHERE location_count_id = ?
    ''', [location_count_id])
    
    return jsonify({'success': True, 'message': 'Bin marked as complete'})


@counting_bp.route('/count/<int:session_id>/location/<int:location_count_id>')
@login_required
def count_location(session_id, location_count_id):
    """Count lots in a specific location"""
    # Get session info to determine type (Cycle Count vs Physical)
    sess = get_active_session(session_id)
    if not sess:
        flash('Session not found or archived', 'warning')
        return redirect(url_for('dashboard'))
    
    location = query_db('''
        SELECT * FROM LocationCounts
        WHERE location_count_id = ? AND session_id = ?
    ''', [location_count_id, session_id], one=True)
    
    if not location:
        flash('Location not found', 'danger')
        return redirect(url_for('counting.count_session', session_id=session_id))
    
    # Check if location is completed and user is staff (not admin/owner)
    if location['status'] == 'completed' and session['role'] == 'staff':
        flash(f'Location {location["location_name"]} has been finalized and cannot accept new scans', 'warning')
        return redirect(url_for('counting.my_counts', session_id=session_id))
    
    # Get scans for this location (Scanned Lots)
    scans = query_db('''
        SELECT * FROM ScanEntries
        WHERE location_count_id = ? AND is_deleted = 0
        ORDER BY scan_timestamp DESC
    ''', [location_count_id])
    
    # NEW LOGIC: Get Expected Lots for Cycle Counts (Grouped & Summed)
    expected_lots = []
    if sess and sess['session_type'] == 'cycle_count':
        expected_lots = query_db('''
            SELECT 
                lot_number,
                MAX(item) as item,  -- Pick one item code if they differ (rare)
                SUM(system_quantity) as total_weight
            FROM BaselineInventory_Master
            WHERE session_id = ? 
            AND system_bin = ?
            AND lot_number NOT IN (
                SELECT lot_number 
                FROM ScanEntries 
                WHERE location_count_id = ? 
                AND is_deleted = 0
            )
            GROUP BY lot_number
            ORDER BY lot_number
        ''', [session_id, location['location_name'], location_count_id])
    
    return render_template('count_location.html', 
                         session_id=session_id,
                         location=location, 
                         scans=scans,
                         expected_lots=expected_lots,
                         session_type=sess['session_type'] if sess else '')


@counting_bp.route('/count/<int:session_id>/location/<int:location_count_id>/scan', methods=['POST'])
@login_required
def scan_lot(session_id, location_count_id):
    """Process a lot scan with duplicate detection"""
    sess = get_active_session(session_id)
    if not sess:
        return jsonify({'success': False, 'message': 'Session not found or archived'})
    
    data = request.get_json()
    lot_number = data.get('lot_number', '').strip()
    weight = data.get('weight')
    confirm_duplicate = data.get('confirm_duplicate', False)
    check_only = data.get('check_only', False)  # Just checking for duplicates, not saving
    
    if not lot_number:
        return jsonify({'success': False, 'message': 'Lot number required'})
    
    if not check_only and not weight:
        return jsonify({'success': False, 'message': 'Weight required'})
    
    if not check_only:
        try:
            weight = float(weight)
        except ValueError:
            return jsonify({'success': False, 'message': 'Invalid weight value'})
    
    # Get location info
    location = query_db('SELECT * FROM LocationCounts WHERE location_count_id = ?', 
                       [location_count_id], one=True)
    
    # Check for duplicates in this session
    existing_scans = query_db('''
        SELECT se.*, lc.location_name, u.full_name
        FROM ScanEntries se
        JOIN LocationCounts lc ON se.location_count_id = lc.location_count_id
        JOIN Users u ON se.scanned_by = u.user_id
        WHERE se.session_id = ? AND se.lot_number = ? AND se.is_deleted = 0
    ''', [session_id, lot_number])
    
    duplicate_status = '00'  # Default: no duplicate
    duplicate_info = None
    needs_confirmation = False
    
    if existing_scans:
        # Check for same location duplicates (by this user)
        same_location = [s for s in existing_scans 
                        if s['location_name'] == location['location_name'] 
                        and s['scanned_by'] == session['user_id']]
        
        # Check for different location duplicates (by anyone)
        diff_location = [s for s in existing_scans 
                        if s['location_name'] != location['location_name']]
        
        if same_location and diff_location:
            # Status 04: Duplicate in both same and different locations
            duplicate_status = '04'
            other_locs = ', '.join(set(f"{s['location_name']} by {s['full_name']}" for s in diff_location))
            duplicate_info = f"Also found in {other_locs}. Duplicate Lot"
            needs_confirmation = True
            
        elif same_location:
            # Status 01: Duplicate in same location only
            duplicate_status = '01'
            duplicate_info = "Duplicate"
            needs_confirmation = True
            
        elif diff_location:
            # Status 03: Duplicate in different location only
            duplicate_status = '03'
            other_locs = ', '.join(set(f"{s['location_name']} by {s['full_name']}" for s in diff_location))
            duplicate_info = f"Also found in {other_locs}"
    
    # If just checking, return early with baseline info
    if check_only:
        # Get baseline info to show what they're scanning
        master_info = query_db('''
            SELECT item, description FROM BaselineInventory_Master
            WHERE session_id = ? AND lot_number = ?
            LIMIT 1
        ''', [session_id, lot_number], one=True)
        
        if needs_confirmation:
            return jsonify({
                'success': False,
                'needs_confirmation': True,
                'message': 'Lot already scanned, Are you sure?',
                'duplicate_status': duplicate_status,
                'item': master_info['item'] if master_info else None,
                'description': master_info['description'] if master_info else None
            })
        else:
            return jsonify({
                'success': True,
                'needs_confirmation': False,
                'item': master_info['item'] if master_info else None,
                'description': master_info['description'] if master_info else None
            })
    
    # If needs confirmation and not yet confirmed, ask user
    if needs_confirmation and not confirm_duplicate:
        return jsonify({
            'success': False,
            'needs_confirmation': True,
            'message': 'Lot already scanned, Are you sure?',
            'duplicate_status': duplicate_status
        })
    
    # Check against MASTER baseline
    master = query_db('''
        SELECT * FROM BaselineInventory_Master
        WHERE session_id = ? AND lot_number = ? AND system_bin = ?
    ''', [session_id, lot_number, location['location_name']], one=True)
    
    # Determine master_status (only if not a duplicate issue)
    if duplicate_status == '00':
        if master:
            # Lot exists in correct location
            master_status = 'match'
            if master['system_quantity'] is not None:
                variance_lbs = weight - master['system_quantity']
                variance_pct = (variance_lbs / master['system_quantity'] * 100) if master['system_quantity'] > 0 else 0
            else:
                variance_lbs = None
                variance_pct = None
        else:
            # Check if lot exists in different location
            master_other = query_db('''
                SELECT * FROM BaselineInventory_Master
                WHERE session_id = ? AND lot_number = ?
            ''', [session_id, lot_number], one=True)
            
            if master_other:
                master_status = 'wrong_location'
                master = master_other
                variance_lbs = None
                variance_pct = None
            else:
                # Ghost lot
                master_status = 'ghost_lot'
                variance_lbs = None
                variance_pct = None
    else:
        # For duplicates, still check baseline for item info
        if not master:
            master = query_db('''
                SELECT * FROM BaselineInventory_Master
                WHERE session_id = ? AND lot_number = ?
            ''', [session_id, lot_number], one=True)
        master_status = 'match'  # Don't override with wrong_location for duplicates
        variance_lbs = None
        variance_pct = None
    
    # Insert scan
    entry_id = execute_db('''
        INSERT INTO ScanEntries 
        (session_id, location_count_id, lot_number, item, description,
         scanned_location, actual_weight, scanned_by,
         master_status, master_expected_location, master_expected_weight,
         master_variance_lbs, master_variance_pct,
         duplicate_status, duplicate_info, comment)
        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
    ''', [
        session_id, location_count_id, lot_number,
        master['item'] if master else None,
        master['description'] if master else None,
        location['location_name'], weight, session['user_id'],
        master_status,
        master['system_bin'] if master else None,
        master['system_quantity'] if master else None,
        variance_lbs, variance_pct,
        duplicate_status, duplicate_info, duplicate_info
    ])
    
    # If this is a confirmed duplicate (01 or 04), update previous scans in same location
    updated_entry_ids = []
    if duplicate_status in ['01', '04'] and confirm_duplicate:
        same_location_ids = [s['entry_id'] for s in existing_scans 
                            if s['location_name'] == location['location_name'] 
                            and s['scanned_by'] == session['user_id']]
        
        for scan_id in same_location_ids:
            execute_db('''
                UPDATE ScanEntries
                SET duplicate_status = ?, 
                    duplicate_info = ?,
                    comment = ?,
                    modified_timestamp = CURRENT_TIMESTAMP
                WHERE entry_id = ?
            ''', [duplicate_status, duplicate_info, duplicate_info, scan_id])
            updated_entry_ids.append(scan_id)
    
    # Update location count
    execute_db('''
        UPDATE LocationCounts
        SET lots_found = lots_found + 1
        WHERE location_count_id = ?
    ''', [location_count_id])
    
    return jsonify({
        'success': True,
        'entry_id': entry_id,
        'master_status': master_status,
        'duplicate_status': duplicate_status,
        'duplicate_info': duplicate_info,
        'master_expected_location': master['system_bin'] if master else None,
        'master_expected_weight': master['system_quantity'] if master else None,
        'actual_weight': weight,
        'variance_lbs': variance_lbs,
        'item': master['item'] if master else 'Unknown Item',
        'description': master['description'] if master else 'Not in system',
        'updated_entry_ids': updated_entry_ids  # IDs of scans that were updated to duplicate
    })


@counting_bp.route('/scan/<int:entry_id>/delete', methods=['POST'])
@login_required
def delete_scan(entry_id):
    """Soft delete a scan and recalculate duplicate statuses"""
    # Get the scan being deleted
    scan = query_db('SELECT * FROM ScanEntries WHERE entry_id = ?', [entry_id], one=True)
    
    if not scan:
        return jsonify({'success': False, 'message': 'Scan not found'})
    
    # Only allow user to delete their own scans
    if scan['scanned_by'] != session['user_id'] and session['role'] not in ['owner', 'admin']:
        return jsonify({'success': False, 'message': 'Permission denied'})
    
    # Soft delete the scan
    execute_db('''
        UPDATE ScanEntries
        SET is_deleted = 1,
            deleted_by = ?,
            deleted_timestamp = CURRENT_TIMESTAMP
        WHERE entry_id = ?
    ''', [session['user_id'], entry_id])
    
    # Recalculate duplicate statuses for this lot number in this session
    updated_entries = recalculate_duplicate_status(scan['session_id'], scan['lot_number'], scan['scanned_location'])
    
    # Update location count
    execute_db('''
        UPDATE LocationCounts
        SET lots_found = lots_found - 1
        WHERE location_count_id = ?
    ''', [scan['location_count_id']])
    
    return jsonify({
        'success': True,
        'message': 'Scan deleted',
        'updated_entries': updated_entries  # Return which scans were updated
    })


@counting_bp.route('/scan/<int:entry_id>/details', methods=['GET'])
@login_required
def get_scan_details(entry_id):
    """Get detailed information about a scan"""
    scan = query_db('SELECT * FROM ScanEntries WHERE entry_id = ? AND is_deleted = 0', [entry_id], one=True)
    
    if not scan:
        return jsonify({'success': False, 'message': 'Scan not found'})
    
    return jsonify({
        'success': True,
        'scan': dict(scan)
    })


@counting_bp.route('/scan/<int:entry_id>/update', methods=['POST'])
@login_required
def update_scan(entry_id):
    """Update scan item, weight and comment"""
    data = request.get_json()
    item = data.get('item', '').strip()
    weight = data.get('weight')
    comment = data.get('comment', '')
    
    # Get the scan
    scan = query_db('SELECT * FROM ScanEntries WHERE entry_id = ?', [entry_id], one=True)
    
    if not scan:
        return jsonify({'success': False, 'message': 'Scan not found'})
    
    # Only allow user to update their own scans
    if scan['scanned_by'] != session['user_id'] and session['role'] not in ['owner', 'admin']:
        return jsonify({'success': False, 'message': 'Permission denied'})
    
    try:
        weight = float(weight)
    except ValueError:
        return jsonify({'success': False, 'message': 'Invalid weight value'})
    
    # Update the scan
    execute_db('''
        UPDATE ScanEntries
        SET item = ?,
            actual_weight = ?,
            comment = ?,
            modified_timestamp = CURRENT_TIMESTAMP
        WHERE entry_id = ?
    ''', [item, weight, comment, entry_id])
    
    return jsonify({'success': True, 'message': 'Scan updated'})


def recalculate_duplicate_status(session_id, lot_number, current_location):
    """Recalculate duplicate statuses for a lot after deletion"""
    # Track which entries were updated
    updated_entries = []
    
    # Get all active scans for this lot in this session
    scans = query_db('''
        SELECT se.*, lc.location_name, u.full_name, u.user_id as scan_user_id
        FROM ScanEntries se
        JOIN LocationCounts lc ON se.location_count_id = lc.location_count_id
        JOIN Users u ON se.scanned_by = u.user_id
        WHERE se.session_id = ? AND se.lot_number = ? AND se.is_deleted = 0
        ORDER BY se.scan_timestamp
    ''', [session_id, lot_number])
    
    if not scans:
        return updated_entries
    
    # Reset all to status 00
    for scan in scans:
        execute_db('''
            UPDATE ScanEntries
            SET duplicate_status = '00',
                duplicate_info = NULL,
                comment = NULL,
                modified_timestamp = CURRENT_TIMESTAMP
            WHERE entry_id = ?
        ''', [scan['entry_id']])
        updated_entries.append({
            'entry_id': scan['entry_id'],
            'duplicate_status': '00',
            'duplicate_info': None
        })
    
    # Recalculate statuses
    for i, scan in enumerate(scans):
        # Get previous scans (before this one chronologically)
        prev_scans = scans[:i]
        
        if not prev_scans:
            continue  # First scan, stays 00
        
        same_location = [s for s in prev_scans if s['location_name'] == scan['location_name'] and s['scan_user_id'] == scan['scan_user_id']]
        diff_location = [s for s in prev_scans if s['location_name'] != scan['location_name']]
        
        duplicate_status = '00'
        duplicate_info = None
        
        if same_location and diff_location:
            # Status 04
            duplicate_status = '04'
            other_locs = ', '.join(set(f"{s['location_name']} by {s['full_name']}" for s in diff_location))
            duplicate_info = f"Also found in {other_locs}. Duplicate Lot"
        elif same_location:
            # Status 01
            duplicate_status = '01'
            duplicate_info = "Duplicate"
        elif diff_location:
            # Status 03
            duplicate_status = '03'
            other_locs = ', '.join(set(f"{s['location_name']} by {s['full_name']}" for s in diff_location))
            duplicate_info = f"Also found in {other_locs}"
        
        # Update this scan if it changed from 00
        if duplicate_status != '00':
            execute_db('''
                UPDATE ScanEntries
                SET duplicate_status = ?,
                    duplicate_info = ?,
                    comment = ?,
                    modified_timestamp = CURRENT_TIMESTAMP
                WHERE entry_id = ?
            ''', [duplicate_status, duplicate_info, duplicate_info, scan['entry_id']])
            
            # Update our tracking list
            for entry in updated_entries:
                if entry['entry_id'] == scan['entry_id']:
                    entry['duplicate_status'] = duplicate_status
                    entry['duplicate_info'] = duplicate_info
                    break
        
        # If status 01 or 04, also update previous scans in same location
        if duplicate_status in ['01', '04'] and same_location:
            for prev_scan in same_location:
                execute_db('''
                    UPDATE ScanEntries
                    SET duplicate_status = ?,
                        duplicate_info = ?,
                        comment = ?,
                        modified_timestamp = CURRENT_TIMESTAMP
                    WHERE entry_id = ?
                ''', [duplicate_status, duplicate_info, duplicate_info, prev_scan['entry_id']])
                
                # Update tracking for previous scans
                for entry in updated_entries:
                    if entry['entry_id'] == prev_scan['entry_id']:
                        entry['duplicate_status'] = duplicate_status
                        entry['duplicate_info'] = duplicate_info
                        break
    
    return updated_entries


@counting_bp.route('/count/<int:session_id>/location/<int:location_count_id>/finish', methods=['POST'])
@login_required
def finish_location(session_id, location_count_id):
    """Finish counting a location"""
    sess = get_active_session(session_id)
    if not sess:
        return jsonify({'success': False, 'message': 'Session not found or archived'})
    
    # Get location info
    location = query_db('SELECT * FROM LocationCounts WHERE location_count_id = ?', 
                       [location_count_id], one=True)
    
    if not location:
        return jsonify({'success': False, 'message': 'Location not found'})
    
    # Mark location as completed
    execute_db('''
        UPDATE LocationCounts
        SET status = 'completed', end_timestamp = CURRENT_TIMESTAMP
        WHERE location_count_id = ?
    ''', [location_count_id])
    
    # V1.0: Mark missing lots from MASTER baseline that weren't scanned
    # Get all expected lots for this location from MASTER baseline
    expected_lots = query_db('''
        SELECT lot_number, item, description, system_quantity
        FROM BaselineInventory_Master
        WHERE session_id = ? AND system_bin = ?
    ''', [session_id, location['location_name']])
    
    # Get all scanned lots for this location
    scanned_lots = query_db('''
        SELECT DISTINCT lot_number
        FROM ScanEntries
        WHERE location_count_id = ? AND is_deleted = 0
    ''', [location_count_id])
    
    scanned_lot_numbers = {s['lot_number'] for s in scanned_lots}
    
    # Insert missing lots
    for expected in expected_lots:
        if expected['lot_number'] not in scanned_lot_numbers:
            execute_db('''
                INSERT INTO MissingLots (session_id, lot_number, master_expected_location, item, master_expected_quantity, marked_by)
                VALUES (?, ?, ?, ?, ?, ?)
            ''', [session_id, expected['lot_number'], location['location_name'], 
                  expected['item'], expected['system_quantity'], session['user_id']])
    
    flash('Location count completed!', 'success')
    return jsonify({
        'success': True,
        'redirect': url_for('counting.count_session', session_id=session_id)
    })