#!/usr/bin/env python3
# admin_users.py — /api/admin/users CRUD endpoints
# v1.0 dradulic@outlook.com / damir@rinet.one — 2026-05-04
"""
GET    /api/admin/users?tenant_type=&tenant_id=&q=
POST   /api/admin/users
PUT    /api/admin/users/{id}
DELETE /api/admin/users/{id}
POST   /api/admin/users/{id}/invite
POST   /api/admin/users/{id}/role
POST   /api/admin/users/{id}/suspend
GET    /api/admin/audit?user_id=&action=&limit=
GET    /api/admin/tenants
POST   /api/admin/users/bulk-csv
"""
import csv, io, secrets, json
from typing import Optional, List, Dict, Any
from datetime import datetime
from fastapi import APIRouter, HTTPException, Depends, Request, Body, UploadFile, File
from pydantic import BaseModel

from .auth_v2 import (
    db_query, db_one, db_exec, hash_password,
    require_user, audit, _client,
    _resolve_tenant, _tier_for,
    PGZ_USER_TYPES, SAVEZ_USER_TYPES, KLUB_USER_TYPES,
    issue_action_token, INVITE_TTL, _build_link,
)

router = APIRouter(prefix="/api/admin", tags=["admin"])

VALID_USER_TYPES = (PGZ_USER_TYPES | SAVEZ_USER_TYPES | KLUB_USER_TYPES |
                    {"viewer", "guest"})

# ─────────────────────────── Permission helpers ───────────────────────────
def _is_pgz_admin(u: Dict) -> bool:
    return (u.get("user_type") or "").lower() in ("super_admin", "pgz_admin")

def _is_savez_admin(u: Dict) -> bool:
    return (u.get("user_type") or "").lower() == "savez_admin"

def _is_klub_admin(u: Dict) -> bool:
    return (u.get("user_type") or "").lower() == "klub_admin"

def _can_manage(actor: Dict, target_user_type: str,
                target_klub_id: Optional[int], target_savez_id: Optional[int]) -> bool:
    """Hierarchical management:
       - super_admin / pgz_admin → manage everyone
       - savez_admin             → manage savez_*, klub_admin in their savez
       - klub_admin              → manage klub_user/klub_trener/klub_clan in their klub
    """
    if _is_pgz_admin(actor): return True
    tut = (target_user_type or "").lower()
    if _is_savez_admin(actor):
        if tut in PGZ_USER_TYPES: return False
        if tut in SAVEZ_USER_TYPES and (target_savez_id == actor.get("savez_id")): return True
        if tut == "klub_admin" and target_savez_id and target_savez_id == actor.get("savez_id"):
            return True
        # any klub user that belongs to this savez
        if tut in KLUB_USER_TYPES and target_savez_id == actor.get("savez_id"):
            return True
        return False
    if _is_klub_admin(actor):
        if tut not in {"klub_user", "klub_trener", "klub_clan", "viewer"}:
            return False
        return target_klub_id and target_klub_id == actor.get("klub_id")
    return False

def _scoped_where(actor: Dict) -> tuple:
    """Filter user list by actor's scope."""
    if _is_pgz_admin(actor): return ("", [])
    if _is_savez_admin(actor):
        sid = actor.get("savez_id")
        if not sid: return ("AND 1=0", [])
        return ("AND (u.savez_id=%s OR u.klub_id IN (SELECT id FROM pgz_sport.klubovi WHERE savez_id=%s))",
                [sid, sid])
    if _is_klub_admin(actor):
        kid = actor.get("klub_id")
        if not kid: return ("AND 1=0", [])
        return ("AND u.klub_id=%s", [kid])
    return ("AND u.id=%s", [actor["id"]])

# ─────────────────────────── List / read ───────────────────────────
@router.get("/users")
def list_users(
    q: Optional[str] = None,
    user_type: Optional[str] = None,
    tenant_type: Optional[str] = None,
    tenant_id: Optional[int] = None,
    klub_id: Optional[int] = None,
    savez_id: Optional[int] = None,
    aktivan: Optional[bool] = None,
    limit: int = 100,
    offset: int = 0,
    actor = Depends(require_user),
):
    if not (_is_pgz_admin(actor) or _is_savez_admin(actor) or _is_klub_admin(actor)):
        raise HTTPException(403, "Forbidden — admin required")
    where = ["1=1"]; args: List[Any] = []
    sw, sp = _scoped_where(actor)
    if sw: where.append(sw.replace("AND ", "")); args.extend(sp)
    if q:
        where.append("(LOWER(u.email) LIKE %s OR LOWER(u.full_name) LIKE %s OR LOWER(COALESCE(u.ime,'')) LIKE %s OR LOWER(COALESCE(u.prezime,'')) LIKE %s)")
        like = f"%{q.lower()}%"; args.extend([like]*4)
    if user_type: where.append("u.user_type=%s"); args.append(user_type)
    if klub_id:   where.append("u.klub_id=%s");   args.append(klub_id)
    if savez_id:  where.append("u.savez_id=%s");  args.append(savez_id)
    if aktivan is not None: where.append("u.aktivan=%s"); args.append(aktivan)
    if tenant_type and tenant_id is not None:
        if tenant_type == "klub":  where.append("u.klub_id=%s");  args.append(tenant_id)
        elif tenant_type == "savez": where.append("u.savez_id=%s"); args.append(tenant_id)
    base_args = list(args)
    args.extend([limit, offset])
    rows = db_query(f"""SELECT u.id, u.email, u.full_name, u.ime, u.prezime, u.user_type,
            u.klub_id, u.savez_id, u.aktivan, u.status, u.must_change_pwd,
            u.last_login, u.locked_until, u.failed_login_count, u.telefon,
            u.created_at, u.gdpr_consent_at,
            k.naziv AS klub_naziv, s.naziv AS savez_naziv
        FROM pgz_sport.users u
        LEFT JOIN pgz_sport.klubovi k ON k.id=u.klub_id
        LEFT JOIN pgz_sport.savezi  s ON s.id=u.savez_id
        WHERE {' AND '.join(where)}
        ORDER BY u.id DESC LIMIT %s OFFSET %s""", tuple(args))
    total = db_one(f"SELECT COUNT(*) AS c FROM pgz_sport.users u WHERE {' AND '.join(where)}",
                   tuple(base_args))["c"]
    return {"count": len(rows), "total": total, "results": rows}

@router.get("/users/{uid}")
def get_user(uid: int, actor = Depends(require_user)):
    u = db_one("""SELECT u.*, k.naziv AS klub_naziv, s.naziv AS savez_naziv
        FROM pgz_sport.users u
        LEFT JOIN pgz_sport.klubovi k ON k.id=u.klub_id
        LEFT JOIN pgz_sport.savezi  s ON s.id=u.savez_id
        WHERE u.id=%s""", (uid,))
    if not u: raise HTTPException(404, "User not found")
    if not (_is_pgz_admin(actor) or
            _can_manage(actor, u.get("user_type"), u.get("klub_id"), u.get("savez_id")) or
            actor["id"] == uid):
        raise HTTPException(403, "Forbidden")
    # Strip sensitive
    u.pop("password_hash", None)
    u.pop("two_factor_secret", None)
    return u

# ─────────────────────────── Create ───────────────────────────
class CreateUserReq(BaseModel):
    email: str
    full_name: Optional[str] = None
    ime: Optional[str] = None
    prezime: Optional[str] = None
    user_type: str = "klub_user"
    klub_id: Optional[int] = None
    savez_id: Optional[int] = None
    telefon: Optional[str] = None
    oib: Optional[str] = None
    password: Optional[str] = None  # if absent → temp pwd + must_change

@router.post("/users")
def create_user(req: CreateUserReq, request: Request, actor = Depends(require_user)):
    if req.user_type not in VALID_USER_TYPES:
        raise HTTPException(400, f"Invalid user_type: {req.user_type}")
    if not _can_manage(actor, req.user_type, req.klub_id, req.savez_id):
        raise HTTPException(403, "Forbidden — out of management scope")
    full_name = req.full_name or ((req.ime or "") + " " + (req.prezime or "")).strip() or req.email
    pwd = req.password or ("PGZ-" + secrets.token_hex(4))
    must_change = not bool(req.password)
    try:
        new_id = db_one("""INSERT INTO pgz_sport.users
            (email, password_hash, full_name, ime, prezime, user_type, klub_id, savez_id,
             telefon, oib, must_change_pwd, aktivan, status, auth_provider)
            VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,true,'active','local')
            RETURNING id""",
            (req.email.lower().strip(), hash_password(pwd), full_name,
             req.ime, req.prezime, req.user_type, req.klub_id, req.savez_id,
             req.telefon, req.oib, must_change))["id"]
    except Exception as e:
        if "duplicate" in str(e).lower() or "unique" in str(e).lower():
            raise HTTPException(409, f"Email već postoji: {req.email}")
        raise HTTPException(400, str(e))
    ip, ua = _client(request)
    audit(actor["id"], "user.create", "user", new_id,
          {"email": req.email, "user_type": req.user_type,
           "klub_id": req.klub_id, "savez_id": req.savez_id}, ip, ua)
    return {"id": new_id, "email": req.email, "user_type": req.user_type,
            "must_change_pwd": must_change,
            "temporary_password": pwd if must_change else None}

# ─────────────────────────── Update ───────────────────────────
class UpdateUserReq(BaseModel):
    full_name: Optional[str] = None
    ime: Optional[str] = None
    prezime: Optional[str] = None
    user_type: Optional[str] = None
    klub_id: Optional[int] = None
    savez_id: Optional[int] = None
    telefon: Optional[str] = None
    oib: Optional[str] = None
    aktivan: Optional[bool] = None

@router.put("/users/{uid}")
def update_user(uid: int, req: UpdateUserReq, request: Request,
                actor = Depends(require_user)):
    target = db_one("SELECT user_type, klub_id, savez_id FROM pgz_sport.users WHERE id=%s",
                    (uid,))
    if not target: raise HTTPException(404, "User not found")
    if not _can_manage(actor, target["user_type"], target["klub_id"], target["savez_id"]):
        raise HTTPException(403, "Forbidden")
    fields, args = [], []
    for f in ["full_name","ime","prezime","user_type","klub_id","savez_id","telefon","oib","aktivan"]:
        v = getattr(req, f)
        if v is not None:
            if f == "user_type" and v not in VALID_USER_TYPES:
                raise HTTPException(400, f"Invalid user_type: {v}")
            fields.append(f"{f}=%s"); args.append(v)
    if not fields:
        return {"status": "nothing_to_update"}
    fields.append("updated_at=now()")
    args.append(uid)
    db_exec(f"UPDATE pgz_sport.users SET {', '.join(fields)} WHERE id=%s", tuple(args))
    ip, ua = _client(request)
    audit(actor["id"], "user.update", "user", uid,
          req.dict(exclude_none=True), ip, ua)
    return {"status": "ok", "id": uid}

# ─────────────────────────── Delete (soft) ───────────────────────────
@router.delete("/users/{uid}")
def delete_user(uid: int, request: Request, actor = Depends(require_user)):
    if uid == actor["id"]:
        raise HTTPException(400, "Ne možete obrisati svoj račun")
    target = db_one("SELECT user_type, klub_id, savez_id, email FROM pgz_sport.users WHERE id=%s",
                    (uid,))
    if not target: raise HTTPException(404, "User not found")
    if not _can_manage(actor, target["user_type"], target["klub_id"], target["savez_id"]):
        raise HTTPException(403, "Forbidden")
    db_exec("""UPDATE pgz_sport.users SET aktivan=false, status='deleted',
               updated_at=now() WHERE id=%s""", (uid,))
    db_exec("UPDATE pgz_sport.user_sessions SET revoked=true WHERE user_id=%s", (uid,))
    ip, ua = _client(request)
    audit(actor["id"], "user.delete", "user", uid, {"email": target["email"]}, ip, ua)
    return {"status": "ok", "id": uid}

# ─────────────────────────── Invite ───────────────────────────
class InviteReq(BaseModel):
    send_email: bool = False  # placeholder — wired to mailer in M11
    note: Optional[str] = None

@router.post("/users/{uid}/invite")
def invite_user(uid: int, req: InviteReq, request: Request,
                actor = Depends(require_user)):
    """Generate a single-use invite token; the user clicks the emailed link
    and lands on /login/setup-password?token=… to set their password."""
    target = db_one("SELECT email, user_type, klub_id, savez_id FROM pgz_sport.users WHERE id=%s",
                    (uid,))
    if not target: raise HTTPException(404, "User not found")
    if not _can_manage(actor, target["user_type"], target["klub_id"], target["savez_id"]):
        raise HTTPException(403, "Forbidden")
    ip, ua = _client(request)
    # Mark must_change_pwd and revoke any existing sessions so old creds can't log in
    db_exec("""UPDATE pgz_sport.users SET must_change_pwd=true, updated_at=now()
               WHERE id=%s""", (uid,))
    db_exec("UPDATE pgz_sport.user_sessions SET revoked=true WHERE user_id=%s", (uid,))
    raw_token = issue_action_token(uid, "invite", INVITE_TTL,
                                    created_by=actor["id"], ip=ip,
                                    meta={"email": target["email"], "note": req.note})
    invite_link = _build_link("/static/login.html?setup=1", raw_token)
    api_link    = _build_link("/api/auth/setup-password", raw_token)
    audit(actor["id"], "user.invite", "user", uid,
          {"email": target["email"], "send_email": req.send_email,
           "ttl_days": INVITE_TTL.days}, ip, ua)
    # NOTE: real deployment must e-mail invite_link via a mailer (M11);
    # for now, the link is returned to the admin who triggered the invite.
    return {"status": "ok", "id": uid,
            "email": target["email"],
            "invite_link": invite_link,
            "api_link": api_link,
            "expires_in_seconds": int(INVITE_TTL.total_seconds()),
            "email_sent": False}

# ─────────────────────────── Role change ───────────────────────────
class RoleReq(BaseModel):
    user_type: str

@router.post("/users/{uid}/role")
def change_role(uid: int, req: RoleReq, request: Request,
                actor = Depends(require_user)):
    if not _is_pgz_admin(actor):
        raise HTTPException(403, "Samo PGŽ admin može mijenjati role")
    if req.user_type not in VALID_USER_TYPES:
        raise HTTPException(400, f"Invalid user_type: {req.user_type}")
    target = db_one("SELECT user_type FROM pgz_sport.users WHERE id=%s", (uid,))
    if not target: raise HTTPException(404, "User not found")
    db_exec("UPDATE pgz_sport.users SET user_type=%s, updated_at=now() WHERE id=%s",
            (req.user_type, uid))
    ip, ua = _client(request)
    audit(actor["id"], "user.role.change", "user", uid,
          {"from": target["user_type"], "to": req.user_type}, ip, ua)
    return {"status": "ok", "id": uid, "user_type": req.user_type}

# ─────────────────────────── Suspend / unsuspend ───────────────────────────
class SuspendReq(BaseModel):
    reason: Optional[str] = None
    minutes: Optional[int] = None  # null → indefinite

@router.post("/users/{uid}/suspend")
def suspend_user(uid: int, req: SuspendReq, request: Request,
                 actor = Depends(require_user)):
    target = db_one("SELECT user_type, klub_id, savez_id FROM pgz_sport.users WHERE id=%s",
                    (uid,))
    if not target: raise HTTPException(404, "User not found")
    if not _can_manage(actor, target["user_type"], target["klub_id"], target["savez_id"]):
        raise HTTPException(403, "Forbidden")
    if req.minutes:
        db_exec("""UPDATE pgz_sport.users
                   SET locked_until = now() + (interval '1 minute' * %s),
                       updated_at = now() WHERE id=%s""", (req.minutes, uid))
    else:
        db_exec("UPDATE pgz_sport.users SET aktivan=false, updated_at=now() WHERE id=%s",
                (uid,))
    db_exec("UPDATE pgz_sport.user_sessions SET revoked=true WHERE user_id=%s", (uid,))
    ip, ua = _client(request)
    audit(actor["id"], "user.suspend", "user", uid,
          {"reason": req.reason, "minutes": req.minutes}, ip, ua)
    return {"status": "ok", "id": uid}

@router.post("/users/{uid}/unsuspend")
def unsuspend_user(uid: int, request: Request, actor = Depends(require_user)):
    target = db_one("SELECT user_type, klub_id, savez_id FROM pgz_sport.users WHERE id=%s",
                    (uid,))
    if not target: raise HTTPException(404, "User not found")
    if not _can_manage(actor, target["user_type"], target["klub_id"], target["savez_id"]):
        raise HTTPException(403, "Forbidden")
    db_exec("""UPDATE pgz_sport.users
               SET aktivan=true, locked_until=NULL, failed_login_count=0,
                   updated_at=now() WHERE id=%s""", (uid,))
    ip, ua = _client(request)
    audit(actor["id"], "user.unsuspend", "user", uid, None, ip, ua)
    return {"status": "ok", "id": uid}

# ─────────────────────────── Reset password (admin) ───────────────────────────
@router.post("/users/{uid}/reset-password")
def admin_reset_password(uid: int, request: Request, actor = Depends(require_user)):
    target = db_one("SELECT user_type, klub_id, savez_id, email FROM pgz_sport.users WHERE id=%s",
                    (uid,))
    if not target: raise HTTPException(404, "User not found")
    if not _can_manage(actor, target["user_type"], target["klub_id"], target["savez_id"]):
        raise HTTPException(403, "Forbidden")
    new_temp = "PGZ-" + secrets.token_hex(4)
    db_exec("""UPDATE pgz_sport.users
               SET password_hash=%s, must_change_pwd=true,
                   failed_login_count=0, locked_until=NULL, updated_at=now()
               WHERE id=%s""", (hash_password(new_temp), uid))
    db_exec("UPDATE pgz_sport.user_sessions SET revoked=true WHERE user_id=%s", (uid,))
    ip, ua = _client(request)
    audit(actor["id"], "user.password.reset", "user", uid,
          {"email": target["email"]}, ip, ua)
    return {"status": "ok", "temporary_password": new_temp}

# ─────────────────────────── Audit log ───────────────────────────
@router.get("/audit")
def audit_log(user_id: Optional[int] = None,
              action: Optional[str] = None,
              resource_type: Optional[str] = None,
              limit: int = 100,
              offset: int = 0,
              actor = Depends(require_user)):
    if not _is_pgz_admin(actor):
        # savez/klub admins see only their scope
        if not (_is_savez_admin(actor) or _is_klub_admin(actor)):
            raise HTTPException(403, "Forbidden")
    where = ["1=1"]; args: List[Any] = []
    if user_id:       where.append("a.user_id=%s"); args.append(user_id)
    if action:        where.append("a.action LIKE %s"); args.append(f"%{action}%")
    if resource_type: where.append("a.resource_type=%s"); args.append(resource_type)
    if not _is_pgz_admin(actor):
        # restrict to own user's actions or resources within scope
        if _is_savez_admin(actor):
            where.append("(a.user_id IN (SELECT id FROM pgz_sport.users WHERE savez_id=%s OR klub_id IN (SELECT id FROM pgz_sport.klubovi WHERE savez_id=%s)))")
            args.extend([actor.get("savez_id"), actor.get("savez_id")])
        elif _is_klub_admin(actor):
            where.append("(a.user_id IN (SELECT id FROM pgz_sport.users WHERE klub_id=%s))")
            args.append(actor.get("klub_id"))
    args.extend([limit, offset])
    rows = db_query(f"""SELECT a.id, a.action, a.resource_type, a.resource_id,
            a.user_id, a.ts AS created_at, a.meta, a.ip_address, a.user_agent,
            u.email AS actor_email, u.full_name AS actor_name
        FROM pgz_sport.audit_events a
        LEFT JOIN pgz_sport.users u ON u.id=a.user_id
        WHERE {' AND '.join(where)}
        ORDER BY a.id DESC LIMIT %s OFFSET %s""", tuple(args))
    return {"count": len(rows), "results": rows}

# ─────────────────────────── Tenants list ───────────────────────────
@router.get("/tenants")
def list_tenants(actor = Depends(require_user)):
    """Combined view: tenants table + savezi + klubovi."""
    tenants = db_query("""SELECT id, slug, display_name, type, status, oib, created_at
        FROM pgz_sport.tenants ORDER BY id""")
    if _is_pgz_admin(actor):
        savezi  = db_query("""SELECT id, naziv, sport, oib, predsjednik, tajnik
            FROM pgz_sport.savezi WHERE aktivan=true ORDER BY naziv LIMIT 200""")
        klubovi = db_query("""SELECT id, naziv, sport, grad, oib, savez_id
            FROM pgz_sport.klubovi WHERE aktivan=true ORDER BY naziv LIMIT 500""")
    elif _is_savez_admin(actor):
        sid = actor.get("savez_id")
        savezi = db_query("""SELECT id, naziv, sport, oib, predsjednik, tajnik
            FROM pgz_sport.savezi WHERE id=%s""", (sid,))
        klubovi = db_query("""SELECT id, naziv, sport, grad, oib, savez_id
            FROM pgz_sport.klubovi WHERE savez_id=%s AND aktivan=true ORDER BY naziv""", (sid,))
    else:
        kid = actor.get("klub_id")
        savezi = []
        klubovi = db_query("""SELECT id, naziv, sport, grad, oib, savez_id
            FROM pgz_sport.klubovi WHERE id=%s""", (kid,))
    return {"tenants": tenants, "savezi": savezi, "klubovi": klubovi}

# ─────────────────────────── Bulk CSV import ───────────────────────────
@router.post("/users/bulk-csv")
async def bulk_csv(file: UploadFile = File(...),
                   default_user_type: str = "klub_clan",
                   default_klub_id: Optional[int] = None,
                   default_savez_id: Optional[int] = None,
                   request: Request = None,
                   actor = Depends(require_user)):
    """CSV columns (header required): email,ime,prezime,user_type,klub_id,savez_id,telefon,oib"""
    if not _is_pgz_admin(actor):
        raise HTTPException(403, "Samo PGŽ admin može masovno uvoziti")
    raw = (await file.read()).decode("utf-8", errors="replace")
    rdr = csv.DictReader(io.StringIO(raw))
    created, skipped, errors = 0, 0, []
    for i, row in enumerate(rdr, 1):
        email = (row.get("email") or "").lower().strip()
        if not email:
            skipped += 1; continue
        try:
            ut = row.get("user_type") or default_user_type
            if ut not in VALID_USER_TYPES:
                errors.append(f"row {i}: invalid user_type {ut}"); skipped += 1; continue
            kid = int(row["klub_id"]) if row.get("klub_id") else default_klub_id
            sid = int(row["savez_id"]) if row.get("savez_id") else default_savez_id
            full_name = (row.get("ime","") + " " + row.get("prezime","")).strip() or email
            temp_pwd = "PGZ-" + secrets.token_hex(4)
            new_id = db_one("""INSERT INTO pgz_sport.users
                (email, password_hash, ime, prezime, full_name, user_type, klub_id, savez_id,
                 telefon, oib, must_change_pwd, aktivan, status, auth_provider)
                VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,true,true,'active','local')
                ON CONFLICT (email) DO NOTHING RETURNING id""",
                (email, hash_password(temp_pwd), row.get("ime"), row.get("prezime"),
                 full_name, ut, kid, sid, row.get("telefon"), row.get("oib")))
            if new_id and new_id.get("id"):
                created += 1
            else:
                skipped += 1
        except Exception as e:
            errors.append(f"row {i}: {e}"); skipped += 1
    audit(actor["id"], "user.bulk_csv", meta={"created": created, "skipped": skipped})
    return {"created": created, "skipped": skipped, "errors": errors[:20]}