import sys

# Asegurar codificación UTF-8 en consola de Windows
if hasattr(sys.stdout, 'reconfigure'):
    sys.stdout.reconfigure(encoding='utf-8')
if hasattr(sys.stderr, 'reconfigure'):
    sys.stderr.reconfigure(encoding='utf-8')

from app import create_app, db
from app.models.user import User
from app.models.role import Role, Permission, SYSTEM_MODULES
from sqlalchemy import text

def init_database():
    app = create_app()
    with app.app_context():
        try:
            print("[*] Conectando a la base de datos y sincronizando esquema...")
            
            # 1. Crear tablas que no existan
            db.create_all()
            
            # 2. Migraciones incrementales seguras para bases de datos existentes
            if db.engine.url.drivername != 'sqlite':
                db.session.execute(text("""
                    ALTER TABLE users ADD COLUMN IF NOT EXISTS preferred_language VARCHAR(10) DEFAULT NULL;
                """))
                db.session.execute(text("""
                    ALTER TABLE users ADD COLUMN IF NOT EXISTS theme_preference VARCHAR(10) DEFAULT 'auto' NOT NULL;
                """))
                db.session.execute(text("""
                    ALTER TABLE users ADD COLUMN IF NOT EXISTS role_id INTEGER REFERENCES roles(id) ON DELETE SET NULL;
                """))
                db.session.execute(text("""
                    ALTER TABLE subjects ADD COLUMN IF NOT EXISTS career_id INTEGER REFERENCES careers(id) ON DELETE SET NULL;
                """))
                db.session.execute(text("""
                    ALTER TABLE subjects ALTER COLUMN code TYPE VARCHAR(50);
                """))
                db.session.execute(text("""
                    CREATE TABLE IF NOT EXISTS buildings (
                        id SERIAL PRIMARY KEY,
                        name VARCHAR(100) UNIQUE NOT NULL,
                        code VARCHAR(50) UNIQUE,
                        address VARCHAR(255),
                        floors INTEGER DEFAULT 1 NOT NULL,
                        description TEXT,
                        is_active BOOLEAN DEFAULT TRUE NOT NULL,
                        created_at TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW(),
                        updated_at TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW()
                    );
                """))
                db.session.execute(text("""
                    CREATE TABLE IF NOT EXISTS audit_logs (
                        id SERIAL PRIMARY KEY,
                        user_id INTEGER REFERENCES users(id) ON DELETE SET NULL,
                        user_email VARCHAR(255),
                        action VARCHAR(50) NOT NULL,
                        module VARCHAR(50) NOT NULL,
                        entity_id INTEGER,
                        details TEXT,
                        ip_address VARCHAR(45),
                        created_at TIMESTAMP WITHOUT TIME ZONE DEFAULT CURRENT_TIMESTAMP NOT NULL
                    );
                    CREATE INDEX IF NOT EXISTS ix_audit_logs_action ON audit_logs (action);
                    CREATE INDEX IF NOT EXISTS ix_audit_logs_module ON audit_logs (module);
                    CREATE INDEX IF NOT EXISTS ix_audit_logs_created_at ON audit_logs (created_at);
                """))
                db.session.execute(text("""
                    ALTER TABLE classrooms ADD COLUMN IF NOT EXISTS building_id INTEGER REFERENCES buildings(id) ON DELETE SET NULL;
                """))
                db.session.execute(text("""
                    ALTER TABLE commissions ADD COLUMN IF NOT EXISTS shift VARCHAR(30);
                """))
                db.session.execute(text("""
                    ALTER TABLE reservations ADD COLUMN IF NOT EXISTS shift VARCHAR(30);
                """))
                db.session.execute(text("""
                    CREATE TABLE IF NOT EXISTS student_enrollments (
                        id SERIAL PRIMARY KEY,
                        student_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
                        commission_id INTEGER NOT NULL REFERENCES commissions(id) ON DELETE CASCADE,
                        status VARCHAR(20) NOT NULL DEFAULT 'activo',
                        enrolled_at TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW() NOT NULL,
                        updated_at TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW(),
                        notes TEXT,
                        CONSTRAINT uq_student_commission UNIQUE (student_id, commission_id)
                    );
                    CREATE INDEX IF NOT EXISTS ix_student_enrollments_student_id ON student_enrollments (student_id);
                    CREATE INDEX IF NOT EXISTS ix_student_enrollments_commission_id ON student_enrollments (commission_id);
                """))
                db.session.commit()
            print("[OK] Esquema y tablas actualizadas con éxito.")
            
            # 3. Crear o sincronizar roles predeterminados y matriz de permisos
            print("[*] Configurando roles institucionales y permisos RBAC...")
            default_roles = [
                {
                    'name': 'Admin',
                    'description': 'Control total institucional, infraestructura, gestion academica y accesos RBAC',
                    'is_system': True,
                    'permissions': {
                        'classrooms': 'read_write',
                        'buildings': 'read_write',
                        'reservations': 'read_write',
                        'schedule': 'read_write',
                        'academic': 'read_write',
                        'import': 'read_write',
                        'optimizer': 'read_write',
                        'users': 'read_write',
                        'milestone_types': 'read_write',
                        'metrics': 'read_write',
                        'enrollment': 'read_write'
                    }
                },
                {
                    'name': 'Docente',
                    'description': 'Gestion de reservas de cursada, consulta de cronograma y materias',
                    'is_system': False,
                    'permissions': {
                        'classrooms': 'read',
                        'buildings': 'read',
                        'reservations': 'read_write',
                        'schedule': 'read_write',
                        'academic': 'read',
                        'import': 'none',
                        'optimizer': 'read',
                        'users': 'none',
                        'milestone_types': 'read',
                        'metrics': 'none',
                        'enrollment': 'read'
                    }
                },
                {
                    'name': 'Bedelia',
                    'description': 'Gestion operativa de aulas, sedes, reservas, comisiones, importacion y cartelera',
                    'is_system': False,
                    'permissions': {
                        'classrooms': 'read_write',
                        'buildings': 'read_write',
                        'reservations': 'read_write',
                        'schedule': 'read_write',
                        'academic': 'read_write',
                        'import': 'read_write',
                        'optimizer': 'none',
                        'users': 'none',
                        'milestone_types': 'read_write',
                        'metrics': 'read_write',
                        'enrollment': 'read_write'
                    }
                },
                {
                    'name': 'Alumno',
                    'description': 'Acceso de solo lectura al cronograma general, asignaturas y aulas',
                    'is_system': False,
                    'permissions': {
                        'classrooms': 'read',
                        'buildings': 'read',
                        'reservations': 'read',
                        'schedule': 'read',
                        'academic': 'read',
                        'import': 'none',
                        'optimizer': 'none',
                        'users': 'none',
                        'milestone_types': 'read',
                        'metrics': 'none',
                        'enrollment': 'read'
                    }
                }
            ]
            
            module_ids = [m['id'] for m in SYSTEM_MODULES]
            admin_role = None
            
            for r_data in default_roles:
                role = Role.query.filter_by(name=r_data['name']).first()
                if not role:
                    role = Role(
                        name=r_data['name'],
                        description=r_data['description'],
                        is_system=r_data['is_system']
                    )
                    db.session.add(role)
                    db.session.flush()
                    print(f"   [+] Rol '{role.name}' creado.")
                else:
                    role.description = r_data['description']
                    role.is_system = r_data['is_system']
                    
                if role.name == 'Admin':
                    admin_role = role
                    
                # Sincronizar permisos del rol
                for mod in module_ids:
                    level = r_data['permissions'].get(mod, 'none')
                    role.set_permission(mod, level)
                    
            db.session.commit()
            print("[OK] Roles y matriz de permisos configurados correctamente.")

            # 3b. Deduplicar rol Bedelia con acento (Bedelía) si existe
            print("[*] Verificando duplicados del rol Bedelia...")
            bedelia_accented = Role.query.filter(
                Role.name.in_(['Bedelía', 'Bedel\u00eda', 'BEDELÍA'])
            ).first()
            bedelia_canonical = Role.query.filter_by(name='Bedelia').first()
            if bedelia_accented and bedelia_canonical and bedelia_accented.id != bedelia_canonical.id:
                # Migrate all users from accented role to canonical
                from app.models.user import User
                affected = User.query.filter_by(role_id=bedelia_accented.id).all()
                for u in affected:
                    u.role_id = bedelia_canonical.id
                    u.role = 'BEDELIA'
                    print(f"   [~] Usuario {u.email} migrado de '{bedelia_accented.name}' a 'Bedelia'")
                db.session.flush()
                db.session.delete(bedelia_accented)
                db.session.commit()
                print(f"   [OK] Rol duplicado '{bedelia_accented.name}' eliminado. {len(affected)} usuario(s) migrado(s).")
            else:
                print("   [OK] Sin duplicados de Bedelia.")
            
            # 4. Verificar o crear usuarios institucionales de cada rol
            print("[*] Verificando usuarios institucionales y credenciales...")
            roles_by_name = {r.name: r for r in Role.query.all()}

            institutional_users = [
                {
                    'email': 'admin@edu-space.com',
                    'name': 'Administrador del Sistema',
                    'role_name': 'Admin',
                    'role_code': 'ADMIN'
                },
                {
                    'email': 'bedelia@edu-space.com',
                    'name': 'Operador de Bedelía',
                    'role_name': 'Bedelia',
                    'role_code': 'BEDELIA'
                },
                {
                    'email': 'docente@edu-space.com',
                    'name': 'Profesor Titular',
                    'role_name': 'Docente',
                    'role_code': 'DOCENTE'
                },
                {
                    'email': 'alumno@edu-space.com',
                    'name': 'Estudiante Regular',
                    'role_name': 'Alumno',
                    'role_code': 'ALUMNO'
                }
            ]

            for u_info in institutional_users:
                u_obj = User.query.filter_by(email=u_info['email']).first()
                r_match = roles_by_name.get(u_info['role_name'])

                if not u_obj:
                    u_obj = User(
                        email=u_info['email'],
                        name=u_info['name'],
                        role=u_info['role_code'],
                        role_id=r_match.id if r_match else None,
                        is_active=True,
                        preferred_language="es",
                        theme_preference="auto"
                    )
                    u_obj.set_password("admin123")
                    db.session.add(u_obj)
                    db.session.commit()
                    print(f"   [+] Usuario creado: {u_info['email']} | Clave: admin123 | Rol: {u_info['role_name']}")
                else:
                    # Garantizar sincronización de rol, estado activo y clave
                    if r_match and u_obj.role_id != r_match.id:
                        u_obj.role_id = r_match.id
                    u_obj.role = u_info['role_code']
                    u_obj.is_active = True
                    if not u_obj.check_password("admin123"):
                        u_obj.set_password("admin123")
                        print(f"   [*] Clave de {u_info['email']} restablecida a 'admin123'.")
                    if not u_obj.preferred_language:
                        u_obj.preferred_language = "es"
                    if not u_obj.theme_preference:
                        u_obj.theme_preference = "auto"
                    db.session.commit()
                    print(f"   [OK] Usuario {u_info['email']} validado (Rol: {u_info['role_name']}, Clave: admin123).")

            # 5. Inicializar edificios institucionales oficiales
            print("[*] Verificando edificios institucionales...")
            from app.models.building import Building
            b_central = Building.query.filter_by(name='Edificio Central').first()
            if not b_central:
                b_central = Building(
                    name='Edificio Central',
                    code='CENTRAL',
                    address='Tte. Gral. Juan Domingo Peron 802, CABA',
                    floors=4,
                    description='Sede central institucional de UniCABA. Aulas de grado, auditorio y laboratorios.'
                )
                db.session.add(b_central)
            else:
                b_central.address = 'Tte. Gral. Juan Domingo Peron 802, CABA'

            b_virtual = Building.query.filter_by(name='Campus Virtual').first()
            if not b_virtual:
                b_virtual = Building(
                    name='Campus Virtual',
                    code='VIRTUAL',
                    address='Entorno Digital / Microsoft Teams - Moodle',
                    floors=0,
                    description='Entorno de aulas virtuales y clases a distancia'
                )
                db.session.add(b_virtual)
            db.session.commit()
            print("[OK] Edificios institucionales configurados con dirección oficial.")

            # 6. Inicializar catalogo dinamico de tipificaciones de hitos academicos
            print("[*] Verificando catalogo de tipificaciones de hitos academicos...")
            from app.models.milestone import MilestoneType, BASE_MILESTONE_TYPES
            for item in BASE_MILESTONE_TYPES:
                mt = MilestoneType.query.filter_by(code=item['code']).first()
                if not mt:
                    mt = MilestoneType(
                        name=item['name'],
                        code=item['code'],
                        color=item['color'],
                        description=item['description'],
                        sort_order=item['sort_order'],
                        is_active=True
                    )
                    db.session.add(mt)
                else:
                    if not mt.color:
                        mt.color = item['color']
                    if not mt.sort_order:
                        mt.sort_order = item['sort_order']
            db.session.commit()
            print(f"[OK] Catalogo de tipificaciones inicializado ({MilestoneType.query.count()} tipos disponibles).")
                
            print("\n[LISTO] Base de datos inicializada y lista para usar.")
            
        except Exception as e:
            # Safe print to avoid UnicodeEncodeError in exception strings
            try:
                print(f"\n[ERROR] Error al inicializar la base de datos: {str(e)}")
            except UnicodeEncodeError:
                print("\n[ERROR] Error al inicializar la base de datos (se omiten caracteres no-ascii).")
            print("\nVerifica que:")
            print("1. El servicio de PostgreSQL este corriendo.")
            print("2. La base de datos 'classrooms_db' haya sido creada.")
            print("3. La variable DATABASE_URL en el archivo .env tenga el usuario y contraseña correctos.")
            sys.exit(1)

if __name__ == "__main__":
    init_database()