import sqlalchemy as sa
from sqlalchemy import Column, Integer, String, Float, Boolean, DateTime, Text, ARRAY, ForeignKey
from sqlalchemy.dialects.postgresql import UUID, JSONB
from sqlalchemy.sql import func
import uuid

try:
    from backend.database import Base
except ImportError:  # pragma: no cover - compatibility for direct module runs
    from database import Base


class User(Base):
    """User model for authentication."""
    __tablename__ = "users"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    username = Column(String(100), unique=True, nullable=False)
    email = Column(String(255), unique=True, nullable=False)
    hashed_password = Column(String(255), nullable=False)
    full_name = Column(String(255))
    role = Column(String(20), nullable=False, default="operator")
    is_active = Column(Boolean, default=True)
    created_at = Column(DateTime, server_default=func.now())
    last_login = Column(DateTime)

    # B21/E1 additions
    unit_id = Column(UUID(as_uuid=True), ForeignKey("mchs_units.id", ondelete="SET NULL"))
    position = Column(String(255))
    status = Column(String(20), default="active")  # active|locked|disabled
    failed_login_count = Column(Integer, default=0)
    locked_until = Column(DateTime(timezone=True))
    must_change_password = Column(Boolean, default=False)
    created_by = Column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"))
    updated_at = Column(DateTime, server_default=func.now())
    # B23: политика паролей (expiry/history исполняется в routers/auth.py)
    password_changed_at = Column(DateTime(timezone=True))


class Case(Base):
    """Unified case model - combines search case and result."""
    __tablename__ = "cases"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    created_at = Column(DateTime, server_default=func.now())
    status = Column(String(20), default="active")

    child_name = Column(String(255))
    age_years = Column(Integer, nullable=False)
    gender = Column(String(1))
    height_build = Column(Text)
    clothes_upper = Column(Text)
    clothes_lower = Column(Text)
    shoes = Column(Text)
    clothes_description = Column(Text)
    special_marks = Column(Text)
    phone_status = Column(String(20))

    has_diagnosis = Column(Boolean, default=False)
    diagnosis_type = Column(ARRAY(String))
    fitness_level = Column(String(20))
    has_transport = Column(String(20), default="none")
    cant_swim = Column(Boolean, default=False)

    psychotype = Column(String(50))
    psychotype_answers = Column(JSONB)

    loss_reason = Column(String(100))
    loss_time = Column(DateTime)
    elapsed_hours = Column(Float)
    last_seen_direction = Column(String(10))
    last_seen_reliability = Column(String(20))
    last_seen_description = Column(Text)
    behavior_description = Column(Text)
    familiar_places = Column(Text)
    lost_before = Column(String(20))

    season = Column(String(20))
    temperature_c = Column(Float)
    precipitation = Column(String(20))
    visibility = Column(String(20))
    wind = Column(String(20))
    terrain = Column(ARRAY(String))

    tnp_lat = Column(Float)
    tnp_lon = Column(Float)
    tnp_address = Column(Text)

    teams_count = Column(Integer)
    team_size = Column(Integer)
    has_dog = Column(Boolean, default=False)
    extra_resources = Column(ARRAY(String))

    found_alive = Column(Boolean)
    found_distance_km = Column(Float)
    found_direction = Column(String(10))
    found_location_type = Column(String(50))
    found_lat = Column(Float)
    found_lon = Column(Float)
    search_duration_hours = Column(Float)
    who_found = Column(String(50))

    confidence_avg = Column(Float)
    raw_text = Column(Text)
    analysis_log = Column(JSONB)


class AnalysisLog(Base):
    """Analysis log for audit and debugging."""
    __tablename__ = "analysis_log"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    case_id = Column(UUID(as_uuid=True), ForeignKey("cases.id", ondelete="CASCADE"), nullable=False)
    user_id = Column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"))
    analysis_type = Column(String(50), nullable=False)
    input_data = Column(JSONB)
    output_data = Column(JSONB)
    execution_time = Column(Float)
    status = Column(String(20), default="success")
    error_message = Column(Text)
    created_at = Column(DateTime, server_default=func.now())


class RawDocument(Base):
    """Raw document storage for parsed reports."""
    __tablename__ = "raw_documents"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    filename = Column(String(255), nullable=False)
    raw_text = Column(Text)
    extracted_json = Column(JSONB)
    created_at = Column(DateTime, server_default=func.now())


# ==================== B15: слоистая модель данных (B13-принцип 2) ====================
# Слой 4 (результат): search_models — версионированные поисковые модели (фундамент B18)
# Слой 3 (оперативные): field_observations / search_teams / areas_checked / found_events
#   — схема+модели сейчас, ингестия в B17
# Слой 1 (исходные): reference_priors — версионированный справочник априорных
#   (заглушка под B12/ISRID и экспертные значения; данные вносятся позже)


class SearchModelRecord(Base):
    """Слой 4: версия поисковой модели для случая (per-case версионирование)."""
    __tablename__ = "search_models"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    case_id = Column(UUID(as_uuid=True), ForeignKey("cases.id", ondelete="CASCADE"), nullable=False)
    version = Column(Integer, nullable=False)
    input_snapshot = Column(JSONB)
    model_json = Column(JSONB)
    created_at = Column(DateTime, server_default=func.now())

    __table_args__ = (
        sa.UniqueConstraint("case_id", "version", name="uq_search_models_case_version"),
    )


class SearchTeam(Base):
    """Слой 3: поисковая группа (ингестия — B17)."""
    __tablename__ = "search_teams"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    case_id = Column(UUID(as_uuid=True), ForeignKey("cases.id", ondelete="CASCADE"), nullable=False)
    name = Column(String(255), nullable=False)
    members = Column(Integer)
    role = Column(String(50))
    created_at = Column(DateTime, server_default=func.now())


class FieldObservation(Base):
    """Слой 3: наблюдение в поле (position/observation/track/clue/witness).
    Геометрия — JSONB GeoJSON (B16 добавит PostGIS-колонки)."""
    __tablename__ = "field_observations"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    case_id = Column(UUID(as_uuid=True), ForeignKey("cases.id", ondelete="CASCADE"), nullable=False)
    team_id = Column(UUID(as_uuid=True), ForeignKey("search_teams.id", ondelete="SET NULL"))
    obs_type = Column(String(20), nullable=False)
    geom = Column(JSONB)
    observed_at = Column(DateTime(timezone=True))
    confidence = Column(Float)
    description = Column(Text)
    raw = Column(JSONB)
    created_at = Column(DateTime, server_default=func.now())

    __table_args__ = (
        sa.CheckConstraint(
            "obs_type IN ('position','observation','track','clue','witness')",
            name="ck_field_observations_obs_type",
        ),
    )


class AreaChecked(Base):
    """Слой 3: проверенный участок (результат работы группы)."""
    __tablename__ = "areas_checked"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    case_id = Column(UUID(as_uuid=True), ForeignKey("cases.id", ondelete="CASCADE"), nullable=False)
    team_id = Column(UUID(as_uuid=True), ForeignKey("search_teams.id", ondelete="SET NULL"))
    geom = Column(JSONB)
    checked_at = Column(DateTime(timezone=True))
    result = Column(String(20), default="partial")
    coverage_pct = Column(Float)
    created_at = Column(DateTime, server_default=func.now())

    __table_args__ = (
        sa.CheckConstraint("result IN ('clear','found','partial')", name="ck_areas_checked_result"),
    )


class FoundEvent(Base):
    """Слой 3: событие находки пропавшего."""
    __tablename__ = "found_events"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    case_id = Column(UUID(as_uuid=True), ForeignKey("cases.id", ondelete="CASCADE"), nullable=False)
    geom = Column(JSONB)
    occurred_at = Column(DateTime(timezone=True))
    condition = Column(String(50))
    team_id = Column(UUID(as_uuid=True), ForeignKey("search_teams.id", ondelete="SET NULL"))
    description = Column(Text)
    created_at = Column(DateTime, server_default=func.now())


class ReferencePrior(Base):
    """Слой 1: версионированный справочник априорных значений
    (экспертные нормы сейчас, ISRID — после B12). Данные НЕ вносятся (B15)."""
    __tablename__ = "reference_priors"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    source = Column(String(100), nullable=False)
    category = Column(String(100), nullable=False)
    value = Column(Float, nullable=False)
    units = Column(String(50))
    provenance = Column(Text)
    version = Column(Integer, nullable=False, default=1)
    created_at = Column(DateTime, server_default=func.now())


# ==================== B21/E1: RBAC-ядро (по образцу админки РВС) ====================
# Иерархия: РЦУ РЧС (rcu) → ОУМЧС (oblast) → Г(Р)ОЧС (gor_rayon)


class MchsUnit(Base):
    """Подразделение МЧС: РЦУ РЧС, ОУМЧС, Г(Р)ОЧС."""
    __tablename__ = "mchs_units"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name = Column(String(255), nullable=False, unique=True)
    region = Column(String(100))       # область (для фильтров)
    kind = Column(String(20), nullable=False)  # rcu | oblast | gor_rayon
    parent_id = Column(UUID(as_uuid=True), ForeignKey("mchs_units.id", ondelete="SET NULL"))
    created_at = Column(DateTime, server_default=func.now())

    __table_args__ = (
        sa.CheckConstraint("kind IN ('rcu','oblast','gor_rayon')", name="ck_mchs_units_kind"),
    )


class Role(Base):
    """Роль (is_system — сидовые, удаление запрещено)."""
    __tablename__ = "roles"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name = Column(String(50), nullable=False, unique=True)
    description = Column(String(255))
    is_system = Column(Boolean, default=False)
    created_at = Column(DateTime, server_default=func.now())


class Permission(Base):
    """Атомарное право."""
    __tablename__ = "permissions"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    code = Column(String(50), nullable=False, unique=True)
    description = Column(String(255))


class RolePermission(Base):
    """M2M роль ↔ право."""
    __tablename__ = "role_permissions"

    role_id = Column(UUID(as_uuid=True), ForeignKey("roles.id", ondelete="CASCADE"), primary_key=True)
    permission_id = Column(UUID(as_uuid=True), ForeignKey("permissions.id", ondelete="CASCADE"), primary_key=True)


class UserRole(Base):
    """M2M пользователь ↔ роль (с кем назначена)."""
    __tablename__ = "user_roles"

    user_id = Column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), primary_key=True)
    role_id = Column(UUID(as_uuid=True), ForeignKey("roles.id", ondelete="CASCADE"), primary_key=True)
    assigned_by = Column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"))
    assigned_at = Column(DateTime, server_default=func.now())


class UserSession(Base):
    """Server-side сессия: JWT несёт session_id, отзыв возможен на стороне БД."""
    __tablename__ = "sessions"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id = Column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    token_hash = Column(String(64), nullable=False, unique=True)  # sha256 jti
    ip_address = Column(String(45))
    user_agent = Column(String(255))
    created_at = Column(DateTime, server_default=func.now())
    expires_at = Column(DateTime(timezone=True), nullable=False)
    last_seen_at = Column(DateTime(timezone=True))
    is_active = Column(Boolean, default=True)


class AuthEvent(Base):
    """Журнал аутентификации: вход/выход/блокировка."""
    __tablename__ = "auth_events"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id = Column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"))
    username = Column(String(100))          # даже если user_id неизвестен
    event_type = Column(String(30), nullable=False)  # login|logout|login_failed|lockout|password_change
    ip_address = Column(String(64))
    user_agent = Column(String(255))
    details = Column(JSONB)
    created_at = Column(DateTime, server_default=func.now())

    __table_args__ = (
        sa.Index("idx_auth_events_created", "created_at"),
    )


class SecuritySetting(Base):
    """Параметры безопасности (key/value)."""
    __tablename__ = "security_settings"

    key = Column(String(50), primary_key=True)
    value = Column(String(255), nullable=False)


class PasswordHistoryEntry(Base):
    """B23: история паролей (bcrypt-хэши). Записывается при каждой смене,
    проверяется против password_history_count последних записей."""
    __tablename__ = "password_history"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id = Column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    hashed_password = Column(String(255), nullable=False)
    created_at = Column(DateTime(timezone=True), server_default=func.now())

    __table_args__ = (
        sa.Index("idx_password_history_user", "user_id", "created_at"),
    )

# ==================== B21/E2: аудит действий ====================

class SearchOperation(Base):
    """B21/E3: поисковая операция — надстройка над карточкой (cases)."""
    __tablename__ = "search_operations"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    title = Column(String(255), nullable=False)
    case_id = Column(UUID(as_uuid=True), ForeignKey("cases.id", ondelete="CASCADE"), nullable=False, unique=True)
    status = Column(String(20), nullable=False, default="active")
    unit_id = Column(UUID(as_uuid=True), ForeignKey("mchs_units.id", ondelete="SET NULL"))
    contour_operation_id = Column(UUID(as_uuid=True))
    created_by = Column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"))
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), server_default=func.now())
    closed_at = Column(DateTime(timezone=True))

    __table_args__ = (
        sa.CheckConstraint(
            "status IN ('planned','active','paused','completed','archived')",
            name="ck_search_operations_status",
        ),
        sa.Index("idx_search_operations_status", "status"),
        sa.Index("idx_search_operations_unit", "unit_id"),
    )


class AuditEvent(Base):
    """Аудит действий (immutable): кто, когда, что. CREATE+READ only."""
    __tablename__ = "audit_events"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id = Column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"))
    username = Column(String(100))
    event_type = Column(String(40), nullable=False)  # user_create|user_update|user_lock|case_create|...
    object_type = Column(String(40))                 # user|case|operation|...
    object_id = Column(String(64))
    ip_address = Column(String(64))
    user_agent = Column(String(255))
    details = Column(JSONB)
    created_at = Column(DateTime(timezone=True), server_default=func.now())

    __table_args__ = (
        sa.Index("idx_audit_events_created", "created_at"),
    )


class AuditChange(Base):
    """Field-level изменения: old → new (привязаны к AuditEvent)."""
    __tablename__ = "audit_changes"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    event_id = Column(UUID(as_uuid=True), ForeignKey("audit_events.id", ondelete="CASCADE"), nullable=False)
    field_name = Column(String(100), nullable=False)
    old_value = Column(Text)
    new_value = Column(Text)