"""Review to ready (S5): deterministic title/short description, price suggestion,
and server-derived `ready` status. Cites REVIEW-5/10/15/20/25/30/40/45/50,
METADATA-80/85/90, SETTINGS-35.
"""

import json
import re
from typing import Any

from fastapi import APIRouter
from fastapi.responses import JSONResponse

from .db import get_connection
from .pricing import rate_for_species

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

# Wood-category leaf slug -> (title pattern, noun, carries_dims).
# Patterns interpolate {figure}, {species}, {length}, {width}, {thickness}, {bdft}.
# Figure is Title-Case adjective; absent figure drops the slot.
_LEAF_PATTERNS = {
    "live-edge-wood": ("{figure}{species} Live Edge Slab", "Live Edge Slab", False),
    "dimensional-wood": ("{figure}{species} {live_edge}Dimensional", "Dimensional", False),
    "knife-blanks": ("{figure}{species} Knife Blank ({dims})", "Knife Blank", True),
    "bowl-blanks": ("{figure}{species} {live_edge}Bowl Blank ({dims})", "Bowl Blank", True),
    "logs-and-caps": ("{figure}{species} Log Cap", "Log Cap", False),
    "pen-blanks": ("{figure}{species} Pen Blank ({dims})", "Pen Blank", True),
    "pepper-mill-blanks": ("{figure}{species} Pepper Mill Blank ({dims})", "Pepper Mill Blank", True),
}

# Required fields for a slab to reach `ready` (REVIEW-5). Measurement fields
# (widths/sqft/bdft) are read-only client math but must be present.
_REQUIRED = [
    "sku", "length_in", "thickness_in", "sqft", "bdft",
    "width_min_in", "width_max_in", "width_avg_in",
    "species_id", "wood_category_ids", "edge_type_term_id",
    "grade_term_id", "thickness_term_id", "moisture_term_id",
    "price", "price_source", "title", "short_description", "description",
    "content_source",
]


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


def _split_length(length_in: float) -> tuple[int, float]:
    ft = int(length_in // 12)
    rem = round(length_in - ft * 12, 1)
    return ft, rem


def _fmt1(v: float) -> str:
    # 1 dp, trim trailing .0
    s = f"{v:.1f}"
    return s[:-2] if s.endswith(".0") else s


def _fmt2(v: float) -> str:
    # 2 dp, trim trailing zeros (thickness carries 1/8-inch precision)
    s = f"{v:.2f}".rstrip("0").rstrip(".")
    return s


def _dims(length_in: float, width_avg_in: float, thickness_in: float) -> str:
    return f"{_fmt1(length_in)} x {_fmt1(width_avg_in)} x {_fmt2(thickness_in)} in"


def build_title(slab: dict, figure: str | None, species_name: str, primary_leaf: dict) -> str:
    pattern, noun, carries_dims = _LEAF_PATTERNS.get(
        primary_leaf.get("slug"), ("{figure}{species} Slab", "Slab", False)
    )
    figure = figure.strip() if figure else ""
    live_edge = ""
    if primary_leaf["slug"] in ("dimensional-wood", "bowl-blanks"):
        live_edge = "Live Edge " if slab.get("edge_type_term_id") else ""
    title = pattern.format(
        figure=figure + " " if figure else "",
        species=species_name,
        live_edge=live_edge,
        noun=noun,
        dims=_dims(slab["length_in"], slab["width_avg_in"], slab["thickness_in"]) if carries_dims else "",
    )
    return re.sub(r"\s+", " ", title).strip()


def build_short_description(slab: dict, figure: str | None, species_name: str, primary_leaf: dict) -> str:
    title = build_title(slab, figure, species_name, primary_leaf)
    ft, rem = _split_length(slab["length_in"])
    length_str = f"{ft}ft {_fmt1(rem)}in"
    bdft = round(slab["bdft"], 1)
    line = f"{title}, {length_str} x {_fmt1(slab['width_avg_in'])}in x {_fmt2(slab['thickness_in'])}in, {_fmt1(bdft)} bdft"
    return re.sub(r"\s+", " ", line).strip()


def _slab_dict(row) -> dict:
    d = dict(row)
    for f in ("wood_category_ids", "figure_term_ids", "fig_tag_ids", "feat_tag_ids"):
        if d.get(f) is not None and isinstance(d[f], str):
            try:
                d[f] = json.loads(d[f])
            except (ValueError, TypeError):
                d[f] = []
    return d


def _taxonomy_lookup(conn):
    cats = {r["id"]: dict(r) for r in conn.execute("SELECT * FROM woo_categories").fetchall()}
    terms = {r["id"]: dict(r) for r in conn.execute("SELECT * FROM woo_attribute_terms").fetchall()}
    return cats, terms


def missing_required(slab: dict) -> list[str]:
    return [f for f in _REQUIRED if slab.get(f) in (None, "", [])]


# REVIEW-45: SKU is 3 to 24 chars, alphanumeric and hyphen only. The middle tier
# (not the DB CHECK) is the business-logic arbiter here; the DB constraint is a backstop.
_SKU_RE = re.compile(r"^[A-Za-z0-9-]{3,24}$")


def sku_valid(sku: Any) -> bool:
    return isinstance(sku, str) and bool(_SKU_RE.match(sku))


def compute_ready(slab: dict) -> tuple[bool, list[str]]:
    missing = missing_required(slab)
    # A present-but-malformed SKU is not ready (business rule, enforced in the middle tier).
    if "sku" not in missing and not sku_valid(slab.get("sku")):
        missing.append("sku")
    return (len(missing) == 0), missing


def price_suggestion(conn, slab: dict) -> float | None:
    if not slab.get("species_id") or slab.get("bdft") is None:
        return None
    rate = rate_for_species(conn, slab["species_id"])
    if rate is None:
        return None
    return round(slab["bdft"] * rate, 2)


@router.post("/{slab_id}/review")
async def review_slab(slab_id: str, payload: dict[str, Any] | None = None) -> dict:
    payload = payload or {}
    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)
    # Apply any review edits (primary category declaration + prose).
    editable = {"primary_wood_category_id", "title", "short_description", "description", "price", "price_source", "sku", "content_source"}
    for k in editable:
        if k in payload and payload[k] is not None:
            if k == "primary_wood_category_id":
                continue  # not stored as a column; derived
            slab[k] = payload[k]
    cats, terms = _taxonomy_lookup(conn)
    # Primary wood category: declared, else first wood_category_ids, else first category.
    primary_id = payload.get("primary_wood_category_id")
    wood_cats = slab.get("wood_category_ids") or []
    if not primary_id:
        primary_id = wood_cats[0] if wood_cats else None
    primary_leaf = cats.get(primary_id, {})
    species_name = cats.get(slab.get("species_id"), {}).get("name", "")
    figure_term_ids = slab.get("figure_term_ids") or []
    figure = terms.get(figure_term_ids[0], {}).get("name") if figure_term_ids else None

    # Deterministic copy (only if not already overridden by owner).
    if not payload.get("title"):
        if primary_leaf and species_name:
            slab["title"] = build_title(slab, figure, species_name, primary_leaf)
    if not payload.get("short_description"):
        if primary_leaf and species_name:
            slab["short_description"] = build_short_description(slab, figure, species_name, primary_leaf)
    # Price suggestion (REVIEW-25): bdft * species rate, empty if no rate; owner override sticks.
    suggested = price_suggestion(conn, slab)
    if payload.get("price") is not None:
        price = payload["price"]
    elif slab.get("price") not in (None, 0):
        price = slab["price"]
    else:
        price = suggested
    ready, missing = compute_ready({**slab, "price": price})
    return {
        "ready": ready,
        "missing": missing,
        "title": slab.get("title"),
        "short_description": slab.get("short_description"),
        "price": price,
        "price_suggestion": suggested,
        "primary_wood_category_id": primary_id,
    }