"""Push per-item: aplica UN cambio a Metabase. Implementa las 20 reglas duras.

Resumen de las reglas que este modulo garantiza:

- R1: target unico (validado por argparse en main.py).
- R2: 1 sola request HTTP por invocacion en la fase de apply
       (excepcion: dashboards nuevos con dashcards = POST + PUT, documentado
       en metabase_create_dashboard_raw).
- R3: push de dashboard NO toca cards. Solo dashcards refs + layout + meta.
- R4: push de card NO toca dashboards.
- R5: dry-run por defecto. --apply requerido para enviar.
- R6: backup obligatorio antes de UPDATE (no en CREATE).
- R7: payload se construye solo desde el YAML del item.
- R8: payload PUT/POST contiene solo lo del YAML, sin merge con remoto.
- R9: _meta.kind/slug deben coincidir con args (validado en validate_one).
- R10: _refs deben resolver a ids del index (validado en validate_one).
- R11: _meta.id debe coincidir con index (validado en validate_one).
- R12: cap de tamano de payload — pide confirmacion si supera 100KB.
- R13: log de cada push en state/push.log (jsonl).
- R14, R15, R16: garantizadas en sync_pull.py.
- R17: freshness check (compara remote.updated_at vs _meta.remote_updated_at).
- R18: count check para dashboards (dashcards/tabs/parameters no menores en local).
- R19: --force-overwrite para saltar R17 + R18 explicitamente.
- R20: cubierto por R18 (cuenta tabs y parameters tambien).
"""

from __future__ import annotations

import datetime as dt
import json
import shutil
import sys
from pathlib import Path
from typing import Any

import yaml

from metabase.cards import (
    metabase_create_card_raw,
    metabase_get_card,
    metabase_update_card,
)
from metabase.dashboards import (
    metabase_create_dashboard_raw,
    metabase_get_dashboard,
    metabase_update_dashboard,
)

from payload import item_path, load_item_yaml
from sync_pull import pull_one
from sync_validate import print_result, validate_one


# Limite del payload para R12
_PAYLOAD_SIZE_WARN_BYTES = 100_000


# ---------------------------------------------------------------- Helpers


def _utc_now_iso() -> str:
    return dt.datetime.now(dt.timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")


def _ts_for_path() -> str:
    return dt.datetime.now(dt.timezone.utc).strftime("%Y-%m-%d_%H%M%S")


def _yaml_dump(path: Path, data: dict) -> None:
    path.parent.mkdir(parents=True, exist_ok=True)
    with path.open("w") as f:
        yaml.safe_dump(data, f, sort_keys=False, allow_unicode=True, default_flow_style=False, width=120)


def _log_push(project, entry: dict) -> None:
    """R13: append-only jsonl log de cada push (dry-run o apply)."""
    log_path = project.state_dir / "push.log"
    project.state_dir.mkdir(exist_ok=True)
    with log_path.open("a") as f:
        f.write(json.dumps(entry) + "\n")


_active_log_entry: dict | None = None
_active_project = None


def _abort(msg: str) -> None:
    """Aborta con exit 2. Si hay un log_entry activo, lo persiste como 'aborted'."""
    print(f"\nABORT — {msg}", file=sys.stderr)
    if _active_log_entry is not None and _active_project is not None:
        _active_log_entry["status"] = "aborted"
        _active_log_entry["abort_reason"] = msg.split("\n", 1)[0]
        _log_push(_active_project, _active_log_entry)
    sys.exit(2)


# ---------------------------------------------------------------- R6: backup


def _backup_or_abort(project, kind: str, slug: str, current_remote: dict) -> Path:
    """R6: serializa el estado remoto actual a state/backups/{ts}/{kind}/{slug}.yaml.
    Si la escritura falla, aborta antes de tocar Metabase."""
    ts = _ts_for_path()
    backup_path = project.state_dir / "backups" / ts / (kind + "s") / f"{slug}.yaml"
    try:
        backup_path.parent.mkdir(parents=True, exist_ok=True)
        with backup_path.open("w") as f:
            yaml.safe_dump(
                {"_backup_of": {"kind": kind, "slug": slug, "ts": ts},
                 "remote_state": current_remote},
                f, sort_keys=False, allow_unicode=True, default_flow_style=False, width=120,
            )
    except Exception as e:
        _abort(f"R6 backup fallo, no se aplicara nada. Error: {e}")
    print(f"  backup: {backup_path.relative_to(project.dir.parent.parent)}")
    return backup_path


# ---------------------------------------------------------------- R17 + R18 + R20


def _freshness_check_or_abort(
    kind: str, slug: str, local_doc: dict, remote: dict, force: bool,
) -> None:
    """R17: si remote.updated_at != _meta.remote_updated_at, abortar (salvo --force)."""
    local_remote_ts = local_doc.get("_meta", {}).get("remote_updated_at")
    current_remote_ts = remote.get("updated_at")
    if local_remote_ts is None:
        # Item nuevo o pull antiguo sin metadata — proceder con cuidado
        return
    if current_remote_ts != local_remote_ts:
        if force:
            print(
                f"  ! force-overwrite ACTIVO: ignorando R17 — "
                f"local snapshot={local_remote_ts}, metabase={current_remote_ts}"
            )
            return
        _abort(
            f"R17 freshness check fallido para {kind} {slug}.\n"
            f"  Tu snapshot:  remote_updated_at = {local_remote_ts}\n"
            f"  Metabase ahora: updated_at      = {current_remote_ts}\n"
            f"  → alguien (o tu mismo) cambio este {kind} en Metabase entre tu pull y este push.\n"
            f"  → para no sobrescribir esos cambios:  python main.py pull {kind} {slug}\n"
            f"  → para sobrescribir igualmente:       --force-overwrite (NO recomendado)"
        )


def _count_check_or_abort(
    slug: str, local_payload: dict, remote: dict, force: bool,
) -> None:
    """R18+R20: para dashboards, si remoto tiene mas dashcards/tabs/parameters
    que el YAML local, abortar (salvo --force)."""
    keys = ("dashcards", "tabs", "parameters")
    losses = []
    for k in keys:
        local_count = len(local_payload.get(k, []) or [])
        remote_count = len(remote.get(k, []) or [])
        if remote_count > local_count:
            losses.append(f"{k}: local={local_count}, metabase={remote_count} (perderias {remote_count - local_count})")

    if losses:
        if force:
            print(f"  ! force-overwrite ACTIVO: ignorando R18 — perdidas: {losses}")
            return
        _abort(
            f"R18 count check fallido para dashboard {slug}:\n  "
            + "\n  ".join(losses)
            + f"\n  → si genuinamente quieres eliminar elementos: --force-overwrite (NO recomendado)\n"
            f"  → si no, haz pull primero:               python main.py pull dashboard {slug}"
        )


# ---------------------------------------------------------------- Push paths


def _push_card_create(client, payload: dict) -> dict:
    """R2: 1 request, POST /api/card. Devuelve la card creada con su id."""
    return metabase_create_card_raw(client, payload)


def _push_card_update(client, card_id: int, payload: dict) -> dict:
    """R2: 1 request, PUT /api/card/:id. R4: solo toca esta card."""
    return metabase_update_card(client, card_id, **payload)


def _push_dashboard_create(client, payload: dict) -> dict:
    """POST + PUT (si hay dashcards) — documentado en metabase_create_dashboard_raw."""
    return metabase_create_dashboard_raw(client, payload)


def _push_dashboard_update(client, dash_id: int, payload: dict) -> dict:
    """R2: 1 request, PUT /api/dashboard/:id. R3: solo toca este dashboard."""
    return metabase_update_dashboard(client, dash_id, **payload)


# ---------------------------------------------------------------- Orchestrator


def push_one(
    project, client, kind: str, slug: str,
    *, apply: bool = False, force_overwrite: bool = False, allow_warnings: bool = False,
) -> dict:
    """Punto de entrada. Devuelve un dict con el resultado."""
    log_entry: dict = {
        "ts": _utc_now_iso(), "kind": kind, "slug": slug,
        "apply": apply, "force_overwrite": force_overwrite,
    }
    # Hacer el entry visible para _abort() para que pueda loguear si aborta
    global _active_log_entry, _active_project
    _active_log_entry = log_entry
    _active_project = project

    # Fase 1: validate (R7+R9+R10+R11+estructura+SQL opcional)
    val_client = client if (apply and kind == "card") else None
    val_result = validate_one(
        project, kind, slug,
        check_sql=(apply and kind == "card"),
        client=val_client,
    )
    print_result(kind, slug, val_result)

    if val_result.errors:
        log_entry["status"] = "validation_errors"
        log_entry["issues"] = val_result.errors
        _log_push(project, log_entry)
        sys.exit(2)

    if val_result.warnings and not allow_warnings:
        if apply:
            print(
                f"\n  ! hay {len(val_result.warnings)} warnings. "
                f"Para aplicar igualmente: --allow-warnings"
            )
            log_entry["status"] = "warnings_blocking_apply"
            log_entry["warnings"] = val_result.warnings
            _log_push(project, log_entry)
            sys.exit(1)

    payload = val_result.payload
    assert payload is not None

    # R12: tamano del payload
    payload_size = len(json.dumps(payload, default=str))
    log_entry["payload_bytes"] = payload_size
    if payload_size > _PAYLOAD_SIZE_WARN_BYTES:
        print(f"\n  ! payload size = {payload_size} bytes (>{_PAYLOAD_SIZE_WARN_BYTES})")
        if apply:
            resp = input("  ¿Continuar con apply? (escribir 'si'): ")
            if resp.strip().lower() != "si":
                _abort("usuario cancelo por tamano")

    # Cargar el doc para tener _meta
    doc = load_item_yaml(item_path(project.dir, kind, slug))
    meta = doc.get("_meta", {})
    item_id = meta.get("id")
    is_create = item_id is None

    # ---- Dry-run path
    if not apply:
        method, url = _resolve_method_url(kind, item_id)
        print(f"\n--- DRY-RUN ({method} {url}) ---")
        print(json.dumps(payload, indent=2, default=str))
        print(f"\n  payload: {payload_size} bytes")
        print(f"  para aplicar: añade --apply")
        log_entry["status"] = "dry_run"
        log_entry["method"] = method
        log_entry["url"] = url
        _log_push(project, log_entry)
        return {"dry_run": True, "payload": payload}

    # ---- Apply path
    print(f"\n--- APPLY ---")

    if is_create:
        # R6 no aplica: nada que respaldar
        print("  modo: CREATE (no hay backup, item nuevo)")
        if kind == "card":
            response = _push_card_create(client, payload)
        elif kind == "dashboard":
            response = _push_dashboard_create(client, payload)
        else:
            _abort(f"create por push de '{kind}' no soportado todavia (solo card/dashboard)")
        new_id = response["id"]
        print(f"  creado con id={new_id}")

        # Actualizar index + _meta del YAML local
        idx = project.load_index()
        idx.setdefault(kind + "s", {})[slug] = new_id
        project.save_index(idx)

        # Re-pull para refrescar _meta con synced_at + remote_updated_at + counts
        print("  re-pull para refrescar _meta...")
        pull_one(client, project, kind, new_id)

        log_entry["status"] = "created"
        log_entry["new_id"] = new_id

    else:
        # UPDATE path: R6 backup obligatorio + R17/R18 checks
        print(f"  modo: UPDATE (id={item_id})")

        # Fetch estado remoto actual
        if kind == "card":
            remote = metabase_get_card(client, item_id)
        elif kind == "dashboard":
            remote = metabase_get_dashboard(client, item_id)
        else:
            _abort(f"update por push de '{kind}' no soportado todavia")

        # R6: backup ANTES de hacer nada destructivo
        backup_path = _backup_or_abort(project, kind, slug, remote)
        log_entry["backup"] = str(backup_path.relative_to(project.dir.parent.parent))

        # R17: freshness
        _freshness_check_or_abort(kind, slug, doc, remote, force_overwrite)

        # R18: count check (solo dashboards)
        if kind == "dashboard":
            _count_check_or_abort(slug, payload, remote, force_overwrite)

        # Apply
        if kind == "card":
            response = _push_card_update(client, item_id, payload)
        elif kind == "dashboard":
            response = _push_dashboard_update(client, item_id, payload)
        print(f"  aplicado.")

        # Re-pull para refrescar _meta
        print("  re-pull para refrescar _meta...")
        pull_one(client, project, kind, item_id)

        log_entry["status"] = "updated"
        log_entry["id"] = item_id

    _log_push(project, log_entry)
    print("OK")
    return {"applied": True, "response": response}


def _resolve_method_url(kind: str, item_id: int | None) -> tuple[str, str]:
    """Devuelve (method, url) que usariamos en apply, para logs."""
    if item_id is None:
        return "POST", f"/api/{kind}"
    return "PUT", f"/api/{kind}/{item_id}"


# ---------------------------------------------------------------- push_all


def _list_slugs(project, kind: str) -> list[str]:
    """Lista slugs (filenames sin .yaml) en projects/{name}/{kind}s/."""
    sub = project.dir / (kind + "s")
    if not sub.exists():
        return []
    return sorted(p.stem for p in sub.glob("*.yaml"))


def push_all(
    project, client,
    *, apply: bool = False, force_overwrite: bool = False, allow_warnings: bool = False,
    kinds: tuple[str, ...] = ("card", "dashboard"),
) -> dict:
    """Pushea todos los YAMLs de cards y dashboards de un proyecto.

    Solo CREATE o UPDATE (reusa push_one) — nunca DELETE.
    Cards primero, dashboards despues, para que los slugs esten en el index
    cuando se resuelven las dashcards.

    Por defecto dry-run. Pasa apply=True para realmente enviar.

    Si un item falla (SystemExit desde push_one), se captura y se continua
    con el siguiente. Devuelve un resumen con el resultado por item.
    """
    print(f"\n=== push all ({'APPLY' if apply else 'DRY-RUN'}) project={project.name} ===")
    summary = {"ok": [], "failed": [], "skipped": []}

    for kind in kinds:
        slugs = _list_slugs(project, kind)
        if not slugs:
            print(f"\n[{kind}] (sin YAMLs en {kind}s/)")
            continue
        print(f"\n[{kind}] {len(slugs)} item(s): {', '.join(slugs)}")
        for slug in slugs:
            print(f"\n--- {kind} {slug} ---")
            try:
                push_one(
                    project, client, kind, slug,
                    apply=apply,
                    force_overwrite=force_overwrite,
                    allow_warnings=allow_warnings,
                )
                summary["ok"].append(f"{kind}:{slug}")
            except SystemExit as e:
                code = e.code if isinstance(e.code, int) else 1
                print(f"  ! {kind} {slug} fallo (exit_code={code}) — continuo")
                summary["failed"].append(f"{kind}:{slug} (exit={code})")
            except Exception as e:
                print(f"  ! {kind} {slug} excepcion: {type(e).__name__}: {e}")
                summary["failed"].append(f"{kind}:{slug} ({type(e).__name__})")

    print(f"\n=== resumen push all ===")
    print(f"  OK:      {len(summary['ok'])}  {summary['ok']}")
    print(f"  FAILED:  {len(summary['failed'])}  {summary['failed']}")
    if not apply:
        print(f"  (dry-run — para aplicar de verdad: --apply)")
    return summary