"""Справочники: организации, VRF, операторы, типы устройств, устройства."""
from fastapi import APIRouter, Depends, Query
from sqlalchemy import String, cast, func, or_, select
from sqlalchemy.orm import Session

from app import schemas as s
from app.db import get_db
from app.models import (
    Address, AddressStatus, Device, DeviceType, Isp, IspNetwork, Organization, Prefix, User, Vrf,
)
from app.security import admin_user, current_user
from app.services import apply_update, audit, commit, count, flush, get_or_404
from fastapi import HTTPException

router = APIRouter(dependencies=[Depends(current_user)])


def _like(q: str) -> str:
    return f"%{q.strip()}%"


# ---------------------------------------------------------------- organizations
def _org_out(db: Session, o: Organization) -> s.OrgOut:
    out = s.OrgOut.model_validate(o)
    out.prefixes_count = count(db, select(Prefix.id).where(Prefix.organization_id == o.id))
    out.addresses_count = count(
        db, select(Address.id).join(Prefix).where(Prefix.organization_id == o.id, Address.status == AddressStatus.assigned)
    )
    return out


@router.get("/organizations", response_model=s.Page[s.OrgOut], tags=["organizations"])
def list_orgs(q: str = "", limit: int = Query(100, le=500), offset: int = 0, db: Session = Depends(get_db)):
    stmt = select(Organization)
    if q:
        stmt = stmt.where(or_(*(c.ilike(_like(q)) for c in (Organization.name, Organization.short_name, Organization.inn, Organization.address))))
    total = count(db, stmt)
    rows = db.scalars(stmt.order_by(Organization.id).limit(limit).offset(offset)).all()
    return s.Page(items=[_org_out(db, o) for o in rows], total=total)


@router.get("/organizations/{id}", response_model=s.OrgOut, tags=["organizations"])
def get_org(id: int, db: Session = Depends(get_db)):
    return _org_out(db, get_or_404(db, Organization, id, "Организация"))


@router.post("/organizations", response_model=s.OrgOut, status_code=201, tags=["organizations"])
def create_org(body: s.OrgIn, db: Session = Depends(get_db), user: User = Depends(admin_user)):
    o = Organization(**body.model_dump())
    db.add(o)
    flush(db, "Организация с таким названием или ИНН уже существует")
    db.add(Vrf(organization_id=o.id, name="default"))
    audit(db, user, "organization", o, "created", o.name)
    commit(db, "Организация с таким названием или ИНН уже существует")
    return _org_out(db, o)


@router.patch("/organizations/{id}", response_model=s.OrgOut, tags=["organizations"])
def update_org(id: int, body: s.OrgIn, db: Session = Depends(get_db), user: User = Depends(admin_user)):
    o = get_or_404(db, Organization, id, "Организация")
    changed = apply_update(o, body.model_dump())
    audit(db, user, "organization", o, "updated", o.name, changed)
    commit(db, "Организация с таким названием или ИНН уже существует")
    return _org_out(db, o)


@router.delete("/organizations/{id}", status_code=204, tags=["organizations"])
def delete_org(id: int, db: Session = Depends(get_db), user: User = Depends(admin_user)):
    o = get_or_404(db, Organization, id, "Организация")
    busy = count(db, select(Prefix.id).where(Prefix.organization_id == id)) or count(
        db, select(Device.id).where(Device.organization_id == id)) or count(db, select(Isp.id).where(Isp.organization_id == id))
    if busy:
        raise HTTPException(409, "Нельзя удалить: у организации есть префиксы, устройства или операторы")
    for v in db.scalars(select(Vrf).where(Vrf.organization_id == id)):
        db.delete(v)
    audit(db, user, "organization", o, "deleted", o.name)
    db.delete(o)
    commit(db)


# ------------------------------------------------------------------------- VRF
def _vrf_out(db: Session, v: Vrf) -> s.VrfOut:
    out = s.VrfOut.model_validate(v)
    out.prefixes_count = count(db, select(Prefix.id).where(Prefix.vrf_id == v.id))
    return out


@router.get("/vrfs", response_model=s.Page[s.VrfOut], tags=["vrf"])
def list_vrfs(organization_id: int | None = None, db: Session = Depends(get_db)):
    stmt = select(Vrf)
    if organization_id:
        stmt = stmt.where(Vrf.organization_id == organization_id)
    rows = db.scalars(stmt.order_by(Vrf.id)).all()
    return s.Page(items=[_vrf_out(db, v) for v in rows], total=len(rows))


@router.post("/vrfs", response_model=s.VrfOut, status_code=201, tags=["vrf"])
def create_vrf(body: s.VrfIn, db: Session = Depends(get_db), user: User = Depends(admin_user)):
    get_or_404(db, Organization, body.organization_id, "Организация")
    v = Vrf(**body.model_dump())
    db.add(v)
    flush(db, "VRF с таким названием уже есть в организации")
    audit(db, user, "vrf", v, "created", v.name)
    commit(db, "VRF с таким названием уже есть в организации")
    return _vrf_out(db, v)


@router.patch("/vrfs/{id}", response_model=s.VrfOut, tags=["vrf"])
def update_vrf(id: int, body: s.VrfUpdate, db: Session = Depends(get_db), user: User = Depends(admin_user)):
    v = get_or_404(db, Vrf, id, "VRF")
    changed = apply_update(v, body.model_dump(exclude_unset=True, exclude_none=True))
    audit(db, user, "vrf", v, "updated", v.name, changed)
    commit(db, "VRF с таким названием уже есть в организации")
    return _vrf_out(db, v)


@router.delete("/vrfs/{id}", status_code=204, tags=["vrf"])
def delete_vrf(id: int, db: Session = Depends(get_db), user: User = Depends(admin_user)):
    v = get_or_404(db, Vrf, id, "VRF")
    if count(db, select(Prefix.id).where(Prefix.vrf_id == id)):
        raise HTTPException(409, "Нельзя удалить: VRF используется префиксами")
    audit(db, user, "vrf", v, "deleted", v.name)
    db.delete(v)
    commit(db)


# ---------------------------------------------------------------- device types
def _type_out(db: Session, t: DeviceType) -> s.DeviceTypeOut:
    out = s.DeviceTypeOut.model_validate(t)
    out.devices_count = count(db, select(Device.id).where(Device.device_type_id == t.id))
    return out


@router.get("/device-types", response_model=s.Page[s.DeviceTypeOut], tags=["devices"])
def list_types(db: Session = Depends(get_db)):
    rows = db.scalars(select(DeviceType).order_by(DeviceType.id)).all()
    return s.Page(items=[_type_out(db, t) for t in rows], total=len(rows))


@router.post("/device-types", response_model=s.DeviceTypeOut, status_code=201, tags=["devices"])
def create_type(body: s.DeviceTypeIn, db: Session = Depends(get_db), user: User = Depends(admin_user)):
    t = DeviceType(name=body.name)
    db.add(t)
    flush(db, "Тип с таким названием уже существует")
    audit(db, user, "device_type", t, "created", t.name)
    commit(db, "Тип с таким названием уже существует")
    return _type_out(db, t)


@router.patch("/device-types/{id}", response_model=s.DeviceTypeOut, tags=["devices"])
def update_type(id: int, body: s.DeviceTypeIn, db: Session = Depends(get_db), user: User = Depends(admin_user)):
    t = get_or_404(db, DeviceType, id, "Тип")
    changed = apply_update(t, {"name": body.name})
    audit(db, user, "device_type", t, "updated", t.name, changed)
    commit(db, "Тип с таким названием уже существует")
    return _type_out(db, t)


@router.delete("/device-types/{id}", status_code=204, tags=["devices"])
def delete_type(id: int, db: Session = Depends(get_db), user: User = Depends(admin_user)):
    t = get_or_404(db, DeviceType, id, "Тип")
    if t.is_default:
        raise HTTPException(409, "Нельзя удалить тип по умолчанию")
    if count(db, select(Device.id).where(Device.device_type_id == id)):
        raise HTTPException(409, "Нельзя удалить: тип используется устройствами")
    audit(db, user, "device_type", t, "deleted", t.name)
    db.delete(t)
    commit(db)


# --------------------------------------------------------------------- devices
def _device_out(db: Session, d: Device) -> s.DeviceOut:
    rows = db.execute(
        select(Address.address, Address.prefix_id, Address.status).where(Address.device_id == d.id).order_by(Address.address)
    ).all()
    t = db.get(DeviceType, d.device_type_id)
    return s.DeviceOut(
        id=d.id, name=d.name, device_type_id=d.device_type_id, device_type_name=t.name,
        organization_id=d.organization_id, mac=d.mac, note=d.note,
        ip_addresses=[s.ip_text(r[0]) for r in rows], first_prefix_id=rows[0][1] if rows else None,
        all_deprecated=bool(rows) and all(r[2] == AddressStatus.deprecated for r in rows),
    )


@router.get("/devices", response_model=s.Page[s.DeviceOut], tags=["devices"])
def list_devices(
    organization_id: int | None = None, device_type_id: int | None = None, q: str = "",
    limit: int = Query(100, le=500), offset: int = 0, db: Session = Depends(get_db),
):
    stmt = select(Device)
    if organization_id:
        stmt = stmt.where(Device.organization_id == organization_id)
    if device_type_id:
        stmt = stmt.where(Device.device_type_id == device_type_id)
    if q:
        ip_match = select(Address.device_id).where(func.host(Address.address).ilike(_like(q)))
        stmt = stmt.where(or_(Device.name.ilike(_like(q)), Device.note.ilike(_like(q)), Device.id.in_(ip_match)))
    total = count(db, stmt)
    rows = db.scalars(stmt.order_by(Device.id).limit(limit).offset(offset)).all()
    return s.Page(items=[_device_out(db, d) for d in rows], total=total)


@router.post("/devices", response_model=s.DeviceOut, status_code=201, tags=["devices"])
def create_device(body: s.DeviceIn, db: Session = Depends(get_db), user: User = Depends(admin_user)):
    get_or_404(db, Organization, body.organization_id, "Организация")
    get_or_404(db, DeviceType, body.device_type_id, "Тип")
    d = Device(**body.model_dump())
    db.add(d)
    flush(db, "Устройство с таким именем уже есть в организации")
    audit(db, user, "device", d, "created", d.name)
    commit(db, "Устройство с таким именем уже есть в организации")
    return _device_out(db, d)


@router.get("/devices/{id}", response_model=s.DeviceOut, tags=["devices"])
def get_device(id: int, db: Session = Depends(get_db)):
    return _device_out(db, get_or_404(db, Device, id, "Устройство"))


@router.patch("/devices/{id}", response_model=s.DeviceOut, tags=["devices"])
def update_device(id: int, body: s.DeviceUpdate, db: Session = Depends(get_db), user: User = Depends(admin_user)):
    d = get_or_404(db, Device, id, "Устройство")
    data = body.model_dump(exclude_unset=True, exclude_none=True)
    if "device_type_id" in data:
        get_or_404(db, DeviceType, data["device_type_id"], "Тип")
    changed = apply_update(d, data)
    audit(db, user, "device", d, "updated", d.name, changed)
    commit(db, "Устройство с таким именем уже есть в организации")
    return _device_out(db, d)


@router.delete("/devices/{id}", status_code=204, tags=["devices"])
def delete_device(id: int, db: Session = Depends(get_db), user: User = Depends(admin_user)):
    d = get_or_404(db, Device, id, "Устройство")
    audit(db, user, "device", d, "deleted", d.name)
    db.delete(d)
    commit(db)


# ------------------------------------------------------------------------ ISPs
def _isp_out(db: Session, i: Isp) -> s.IspOut:
    org = db.get(Organization, i.organization_id)
    return s.IspOut(
        id=i.id, name=i.name, organization_id=i.organization_id, organization_name=org.name,
        networks=[str(n.cidr) for n in i.networks], hotline=i.hotline,
        contract_number=i.contract_number, note=i.note,
    )


@router.get("/isps", response_model=s.Page[s.IspOut], tags=["isps"])
def list_isps(
    organization_id: int | None = None, q: str = "", limit: int = Query(100, le=500), offset: int = 0,
    db: Session = Depends(get_db),
):
    stmt = select(Isp)
    if organization_id:
        stmt = stmt.where(Isp.organization_id == organization_id)
    if q:
        nets = select(IspNetwork.isp_id).where(cast(IspNetwork.cidr, String).ilike(_like(q)))
        orgs = select(Organization.id).where(Organization.name.ilike(_like(q)))
        stmt = stmt.where(or_(Isp.name.ilike(_like(q)), Isp.id.in_(nets), Isp.organization_id.in_(orgs)))
    total = count(db, stmt)
    rows = db.scalars(stmt.order_by(Isp.id).limit(limit).offset(offset)).all()
    return s.Page(items=[_isp_out(db, i) for i in rows], total=total)


@router.post("/isps", response_model=s.IspOut, status_code=201, tags=["isps"])
def create_isp(body: s.IspIn, db: Session = Depends(get_db), user: User = Depends(admin_user)):
    get_or_404(db, Organization, body.organization_id, "Организация")
    data = body.model_dump()
    nets = data.pop("networks")
    i = Isp(**data, networks=[IspNetwork(cidr=n) for n in nets])
    db.add(i)
    db.flush()
    audit(db, user, "isp", i, "created", i.name)
    commit(db)
    return _isp_out(db, i)


@router.put("/isps/{id}", response_model=s.IspOut, tags=["isps"])
def update_isp(id: int, body: s.IspIn, db: Session = Depends(get_db), user: User = Depends(admin_user)):
    i = get_or_404(db, Isp, id, "Оператор")
    get_or_404(db, Organization, body.organization_id, "Организация")
    data = body.model_dump()
    nets = data.pop("networks")
    changed = apply_update(i, data)
    i.networks = [IspNetwork(cidr=n) for n in nets]
    audit(db, user, "isp", i, "updated", i.name, changed)
    commit(db)
    return _isp_out(db, i)


@router.delete("/isps/{id}", status_code=204, tags=["isps"])
def delete_isp(id: int, db: Session = Depends(get_db), user: User = Depends(admin_user)):
    i = get_or_404(db, Isp, id, "Оператор")
    audit(db, user, "isp", i, "deleted", i.name)
    db.delete(i)
    commit(db)