"""
Simplified 4-Tier Role-Based Access Control System
Clear hierarchy: Superadmin → Admin → Manager → Worker
Module-based permissions: Quality, Labels, Warehouse
"""

# APPLICATION MODULES
MODULES = {
    'quality': {
        'name': 'Quality Control',
        'scan_pages': ['quality', 'fg_quality'],
        'management_pages': ['quality_reports', 'quality_settings'],
        'worker_access': ['scan_only']  # Workers can only scan, no reports
    },
    'labels': {
        'name': 'Label Management', 
        'scan_pages': ['label_scan'],
        'management_pages': ['label_creation', 'label_reports'],
        'worker_access': ['scan_only']
    },
    'warehouse': {
        'name': 'Warehouse Management',
        'scan_pages': ['move_orders'],
        'management_pages': ['create_locations', 'warehouse_reports', 'inventory_management'],
        'worker_access': ['move_orders_only']  # Workers can move orders but not create locations
    },
    'daily_mirror': {
        'name': 'Daily Mirror',
        'scan_pages': [],  # No scanning, purely reporting/analytics
        'management_pages': ['daily_mirror_main', 'daily_mirror_report', 'daily_mirror_history', 'daily_mirror_analytics'],
        'worker_access': ['view_only'],  # Workers can view daily reports but cannot generate or export
        'description': 'Business Intelligence and Production Reporting Module'
    }
}

# 4-TIER ROLE STRUCTURE
ROLES = {
    'superadmin': {
        'name': 'Super Administrator',
        'level': 100,
        'description': 'Full system access - complete control over all modules and system settings',
        'access': {
            'all_modules': True,
            'all_pages': True,
            'restricted_pages': []  # No restrictions
        }
    },
    'admin': {
        'name': 'Administrator', 
        'level': 90,
        'description': 'Full app access except role permissions and extension download',
        'access': {
            'all_modules': True,
            'all_pages': True,
            'restricted_pages': ['role_permissions', 'download_extension']
        }
    },
    'manager': {
        'name': 'Manager',
        'level': 70, 
        'description': 'Complete module access - can manage one or more modules (quality/labels/warehouse)',
        'access': {
            'all_modules': False,  # Only assigned modules
            'module_access': 'full',  # Full access to assigned modules
            'can_cumulate': True,  # Can have multiple modules
            'restricted_pages': ['role_permissions', 'download_extension', 'system_settings']
        }
    },
    'worker': {
        'name': 'Worker',
        'level': 50,
        'description': 'Limited module access - can perform basic operations in assigned modules',
        'access': {
            'all_modules': False,  # Only assigned modules
            'module_access': 'limited',  # Limited access (scan pages only)
            'can_cumulate': True,  # Can have multiple modules
            'restricted_pages': ['role_permissions', 'download_extension', 'system_settings', 'reports']
        }
    }
}

# PAGE ACCESS RULES
PAGE_ACCESS = {
    # System pages accessible by role level
    'dashboard': {'min_level': 50, 'modules': []},
    'settings': {'min_level': 90, 'modules': []},
    'role_permissions': {'min_level': 100, 'modules': []},  # Superadmin only
    'download_extension': {'min_level': 100, 'modules': []},  # Superadmin only
    
    # Quality module pages
    'quality': {'min_level': 50, 'modules': ['quality']},
    'fg_quality': {'min_level': 50, 'modules': ['quality']},
    'quality_reports': {'min_level': 70, 'modules': ['quality']},  # Manager+ only
    'reports': {'min_level': 70, 'modules': ['quality']},  # Manager+ only for quality reports
    
    # Warehouse module pages  
    'warehouse': {'min_level': 50, 'modules': ['warehouse']},
    'move_orders': {'min_level': 50, 'modules': ['warehouse']},
    'create_locations': {'min_level': 70, 'modules': ['warehouse']},  # Manager+ only
    'warehouse_reports': {'min_level': 70, 'modules': ['warehouse']},  # Manager+ only
    
    # Labels module pages
    'labels': {'min_level': 50, 'modules': ['labels']},
    'label_scan': {'min_level': 50, 'modules': ['labels']},
    'label_creation': {'min_level': 70, 'modules': ['labels']},  # Manager+ only
    'label_reports': {'min_level': 70, 'modules': ['labels']},  # Manager+ only
    
    # Daily Mirror module pages
    'daily_mirror_main': {'min_level': 70, 'modules': ['daily_mirror']},  # Manager+ only
    'daily_mirror_report': {'min_level': 70, 'modules': ['daily_mirror']},  # Manager+ only
    'daily_mirror_history': {'min_level': 70, 'modules': ['daily_mirror']},  # Manager+ only
    'daily_mirror_analytics': {'min_level': 90, 'modules': ['daily_mirror']},  # Admin+ only for advanced analytics
    'daily_mirror': {'min_level': 70, 'modules': ['daily_mirror']}  # Legacy route support
}

def check_access(user_role, user_modules, page):
    """
    Simple access check for the 4-tier system
    
    Args:
        user_role (str): User's role (superadmin, admin, manager, worker)
        user_modules (list): User's assigned modules ['quality', 'warehouse']
        page (str): Page being accessed
    
    Returns:
        bool: True if access granted, False otherwise
    """
    if user_role not in ROLES:
        return False
    
    user_level = ROLES[user_role]['level']
    
    # Check if page exists in our access rules
    if page not in PAGE_ACCESS:
        return False
    
    page_config = PAGE_ACCESS[page]
    
    # Check minimum level requirement
    if user_level < page_config['min_level']:
        return False
    
    # Check restricted pages for this role
    if page in ROLES[user_role]['access']['restricted_pages']:
        return False
    
    # Check module requirements
    required_modules = page_config['modules']
    if required_modules:
        # Page requires specific modules
        # Superadmin and admin have access to all modules by default
        if ROLES[user_role]['access']['all_modules']:
            return True
        # Other roles need to have the required module assigned
        if not any(module in user_modules for module in required_modules):
            return False
    
    return True

def get_user_accessible_pages(user_role, user_modules):
    """
    Get list of pages accessible to a user
    
    Args:
        user_role (str): User's role
        user_modules (list): User's assigned modules
    
    Returns:
        list: List of accessible page names
    """
    accessible_pages = []
    
    for page in PAGE_ACCESS.keys():
        if check_access(user_role, user_modules, page):
            accessible_pages.append(page)
    
    return accessible_pages

def validate_user_modules(user_role, user_modules):
    """
    Validate that user's module assignment is valid for their role
    
    Args:
        user_role (str): User's role
        user_modules (list): User's assigned modules
    
    Returns:
        tuple: (is_valid, error_message)
    """
    if user_role not in ROLES:
        return False, "Invalid role"
    
    role_config = ROLES[user_role]
    
    # Superadmin and admin have access to all modules by default
    if role_config['access']['all_modules']:
        return True, ""
    
    # Manager can have multiple modules
    if user_role == 'manager':
        if not user_modules:
            return False, "Managers must have at least one module assigned"
        valid_modules = list(MODULES.keys())
        for module in user_modules:
            if module not in valid_modules:
                return False, f"Invalid module: {module}"
        return True, ""
    
    # Worker can have multiple modules now
    if user_role == 'worker':
        if not user_modules:
            return False, "Workers must have at least one module assigned"
        valid_modules = list(MODULES.keys())
        for module in user_modules:
            if module not in valid_modules:
                return False, f"Invalid module: {module}"
        return True, ""
    
    return True, ""

def get_role_description(role):
    """Get human-readable role description"""
    return ROLES.get(role, {}).get('description', 'Unknown role')

def get_available_modules():
    """Get list of available modules"""
    return list(MODULES.keys())

def can_access_reports(user_role, user_modules, module):
    """
    Check if user can access reports for a specific module
    Worker level users cannot access reports
    """
    if user_role == 'worker':
        return False
    
    if module in user_modules or ROLES[user_role]['access']['all_modules']:
        return True
    
    return False