"""Publish sequence (S6). Cites PUBLISH-5/10/15/20/25/30/31/36/37/38/55/60.

Sequence (PUBLISH-5): validate ready set -> look up SKU (stop if exists) ->
refresh taxonomy if last sync >1h -> resolve cats/tags/attrs -> upload processed
PNGs -> POST /products -> finalize. SLAB-UAT-* always draft (PUBLISH-10).
Failure: mark failed, retain photos, write sync_log, plain message (PUBLISH-30).
Partial (media ok, product POST failed): orphan media left, logged (PUBLISH-31).
"""

import json
import re
from datetime import datetime, timedelta, timezone
from typing import Any

from fastapi import APIRouter
from fastapi.responses import JSONResponse

from .db import get_connection
from .woo import WooAuthError, WooClient, WooConnectionError, WooCredentialsMissing, WooError
from .review import compute_ready, _slab_dict

router = APIRouter(prefix="/api/v1/slabs")


def _error(code: str, message: str, detail: Any = None) -> dict:
    return {"error": {"code": code, "message": message, "detail": detail}}


def _now() -> str:
    return datetime.now(timezone.utc).replace(microsecond=0, tzinfo=None).isoformat()


def _is_uat(sku: str) -> bool:
    return sku.startswith("SLAB-UAT-")


def _slugify(name: str, sku: str) -> str:
    base = re.sub(r"[^a-z0-9]+", "-", name.lower()).strip("-")
    return f"{base}-{sku.lower()}"


def _taxonomy_stale(conn) -> bool:
    row = conn.execute("SELECT value FROM settings WHERE key='taxonomy_last_sync_at'").fetchone()
    if not row or not row[0]:
        return True
    try:
        last = datetime.fromisoformat(row[0])
    except ValueError:
        return True
    if last.tzinfo is None:
        last = last.replace(tzinfo=timezone.utc)
    return datetime.now(timezone.utc) - last > timedelta(hours=1)


def _build_payload(slab: dict, conn, status: str) -> dict:
    payload: dict[str, Any] = {
        "type": "simple",
        "status": status,
        "sku": slab["sku"],
        "name": slab["title"],
        "slug": _slugify(slab["title"], slab["sku"]),
        "regular_price": f"{slab['price']:.2f}",
        "description": slab["description"],
        "short_description": slab["short_description"],
        "virtual": False,
        "downloadable": False,
        "catalog_visibility": "visible",
        "sold_individually": True,
    }
    wood_cats = slab.get("wood_category_ids") or []
    payload["categories"] = [{"id": slab["species_id"]}]+[{"id": c} for c in wood_cats]
    tags = [t for t in (slab.get("fig_tag_ids") or [])]+[t for t in (slab.get("feat_tag_ids") or [])]
    if tags:
        payload["tags"] = [{"id": t} for t in tags]
    # Five locked attributes by synced term name.
    terms = {r["id"]: dict(r) for r in conn.execute("SELECT * FROM woo_attribute_terms").fetchall()}
    attrs = {r["id"]: dict(r) for r in conn.execute("SELECT * FROM woo_attributes").fetchall()}
    built_attrs = []
    for field, attr_name, pos in (
        ("edge_type_term_id", "Edge Type", 0),
        ("figure_term_ids", "Figure", 1),
        ("grade_term_id", "Grade", 2),
        ("thickness_term_id", "Thickness", 3),
        ("moisture_term_id", "Moisture", 4),
    ):
        raw = slab.get(field)
        term_ids = raw if isinstance(raw, list) else ([raw] if raw else [])
        options = [terms[t]["name"] for t in term_ids if t in terms]
        attr_id = _attr_id_by_name(attrs, attr_name)
        if attr_id and options:
            built_attrs.append({"id": attr_id, "position": pos, "visible": True, "variation": False, "options": options})
    if built_attrs:
        payload["attributes"] = built_attrs
    return payload


def _attr_id_by_name(attrs: dict, name: str) -> int | None:
    for a in attrs.values():
        if a.get("name", "").lower() == name.lower():
            return a["id"]
    return None


def _classify(e: Exception) -> tuple[str, str, bool]:
    """Return (code, plain message, recoverable)."""
    if isinstance(e, WooCredentialsMissing):
        return "woo_unconfigured", "Woo is not configured. Set the store credentials in Settings.", False
    if isinstance(e, WooAuthError):
        return "woo_auth", "The store rejected the credentials. Check the app password.", False
    if isinstance(e, WooConnectionError):
        return "woo_unreachable", "The store is unreachable right now. You can retry.", True
    return "woo_failed", "The store create failed. You can retry.", True


@router.post("/{slab_id}/publish")
async def publish(slab_id: str) -> dict:
    conn = get_connection()
    row = conn.execute("SELECT * FROM slabs WHERE id=? AND deleted_at IS NULL", (slab_id,)).fetchone()
    if row is None:
        return JSONResponse(status_code=404, content=_error("not_found", "Slab not found"))
    slab = _slab_dict(row)
    # 1. Ready set (PUBLISH-5)
    ready, missing = compute_ready(slab)
    if not ready:
        return JSONResponse(status_code=422, content=_error("unpublishable", "Slab is not ready", {"missing": missing}))
    # 2. SKU lookup (PUBLISH-15) — stop if it exists in the store.
    base, user, enc = _woo_creds(conn)
    try:
        client = WooClient.from_settings(base, user, enc)
    except WooCredentialsMissing as e:
        return JSONResponse(status_code=422, content=_error("woo_unconfigured", str(e)))
    try:
        existing = _sku_exists(client, slab["sku"])
    except WooError as e:
        code, msg, rec = _classify(e)
        _log(conn, slab_id, None, "failed", msg)
        conn.execute("UPDATE slabs SET status='failed', updated_at=? WHERE id=?", (_now(), slab_id))
        conn.commit()
        return JSONResponse(status_code=502, content=_error(code, msg, {"recoverable": rec}))
    if existing:
        _log(conn, slab_id, None, "failed", "SKU already exists in the store")
        return JSONResponse(status_code=409, content=_error("duplicate_sku", "SKU already exists", {"sku": slab["sku"]}))
    # 3. Refresh taxonomy if stale (SETTINGS-60).
    if _taxonomy_stale(conn):
        try:
            from . import taxonomy as taxonomy_mod

            taxonomy_mod.sync(client, conn)
        except WooError as e:
            code, msg, rec = _classify(e)
            return JSONResponse(status_code=502, content=_error(code, msg, {"recoverable": rec}))
    # 4/5. Upload processed PNGs, then POST product.
    status = "draft" if _is_uat(slab["sku"]) else _create_status(conn)
    photos = conn.execute(
        "SELECT id, processed_blob FROM slab_photos WHERE slab_id=? AND processed_blob IS NOT NULL ORDER BY seq",
        (slab_id,),
    ).fetchall()
    uploaded_ids: list[int] = []
    try:
        for p in photos:
            uploaded_ids.append(client.upload_media(p["processed_blob"], f"{slab['sku']}-{p['id']}.png"))
        payload = _build_payload(slab, conn, status)
        if uploaded_ids:
            payload["images"] = [{"id": i} for i in uploaded_ids]
        woo_product_id = _create_product(client, payload)
    except WooError as e:
        code, msg, rec = _classify(e)
        partial = bool(uploaded_ids)
        if partial:
            msg = f"{msg} The uploaded images were left in the store — remove them manually."
        _log(conn, slab_id, None, "failed", msg)
        conn.execute("UPDATE slabs SET status='failed', updated_at=? WHERE id=?", (_now(), slab_id))
        conn.commit()
        return JSONResponse(status_code=502, content=_error(code, msg, {"recoverable": rec, "partial_media": partial}))
    # 6. Finalize (PUBLISH-25): set woo_product_id, purge photos, discard local row.
    now = _now()
    conn.execute("UPDATE slabs SET status='published', woo_product_id=?, published_at=?, updated_at=? WHERE id=?",
                 (woo_product_id, now, now, slab_id))
    conn.execute("UPDATE slab_photos SET original_blob=NULL, processed_blob=NULL WHERE slab_id=?", (slab_id,))
    _log(conn, slab_id, woo_product_id, "success", "published")
    conn.commit()
    return {
        "ok": True,
        "status": "published",
        "woo_product_id": woo_product_id,
        "draft": _is_uat(slab["sku"]),
    }


def _woo_creds(conn) -> tuple[str, str | None, str | None]:
    import os

    base = os.environ.get("WOO_BASE_URL", "")
    u = conn.execute("SELECT value FROM settings WHERE key='woo_wp_username'").fetchone()
    p = conn.execute("SELECT value_enc FROM settings WHERE key='woo_app_password'").fetchone()
    return base, (u[0] if u else None), (p[0] if p else None)


def _create_status(conn) -> str:
    row = conn.execute("SELECT value FROM settings WHERE key='woo_create_status'").fetchone()
    return (row[0] if row and row[0] else "draft")


def _sku_exists(client: WooClient, sku: str) -> bool:
    code, _h, body = client._request(
        f"{client.base_url}/wp-json/wc/v3/products?sku={sku}",
        "GET", None,
        {"Authorization": f"Basic {client._auth}", "Accept": "application/json"},
    )
    if code != 200:
        raise WooError(f"sku lookup returned {code}")
    return len(json.loads(body)) > 0


def _create_product(client: WooClient, payload: dict) -> int:
    body = json.dumps(payload).encode("utf-8")
    code, _h, resp = client._request(
        f"{client.base_url}/wp-json/wc/v3/products",
        "POST", body,
        {"Authorization": f"Basic {client._auth}", "Content-Type": "application/json", "Accept": "application/json"},
    )
    if code not in (200, 201):
        raise WooError(f"product create returned {code}")
    return int(json.loads(resp)["id"])


def _log(conn, slab_id: str, woo_product_id: int | None, status: str, message: str) -> None:
    conn.execute(
        "INSERT INTO sync_log(slab_id, woo_product_id, status, payload_hash, message, created_at) VALUES (?,?,?,?,?,?)",
        (slab_id, woo_product_id, status, None, message, _now()),
    )