"""Read-only catalog of questionnaire items for patient clients (web app).

The dialog engine sends a questionnaire question as plain text plus buttons; the button payload carries the item id
(`iq:<nonce>:<item>:<i>`, `scale:<scale>:<item>:<v>`). A client looks the item up here to show which form it belongs
to, its position and recall period. Nothing here changes what is asked or how it is scored — the texts stay those of
the versioned sources in config/.
"""

from functools import lru_cache
from typing import Any, Literal

import yaml
from pydantic import BaseModel

from app.config import get_settings
from app.core.cssrs_content import load_cssrs_russian
from app.core.intake_questions import content, texts
from app.core.scales import load_scale

Section = Literal["safety", "mood", "trauma", "alcohol", "about", "diary", "scale"]

# Forms whose item order depends on earlier answers: a client shows the position without «из N».
ADAPTIVE = {"cssrs", "rus_audit", "diary", "context"}


class FormInfo(BaseModel):
    id: str
    title: str
    section: Section
    recall_period: str | None = None
    instruction: str | None = None


class ItemInfo(BaseModel):
    form: str
    index: int  # 1-based position in the form
    total: int
    adaptive: bool
    optional: bool = False
    numeric: bool = False


class DrinksTable(BaseModel):
    """RUS-AUDIT item 2 standard-drink table, exactly as in config/texts/intake.yaml (the approved form)."""

    title: str
    header: list[str]
    rows: list[tuple[str, list[str]]]
    note: str


class Catalog(BaseModel):
    forms: dict[str, FormInfo]
    items: dict[str, ItemInfo]
    standard_drinks: DrinksTable | None


def _drinks() -> DrinksTable | None:
    raw = texts().get("standard_drinks")
    if not raw:
        return None
    lines = [line.strip() for line in raw.splitlines() if line.strip()]
    title, header_line, *rest = lines
    rows = [line for line in rest if ":" in line]
    note = " ".join(line for line in rest if ":" not in line)
    return DrinksTable(
        title=title,
        header=[h.strip() for h in header_line.split("·")],
        rows=[
            (label.strip(), [c.strip() for c in cells.split("·")]) for label, cells in (r.split(":", 1) for r in rows)
        ],
        note=note,
    )


@lru_cache(maxsize=1)
def catalog() -> Catalog:
    forms: dict[str, FormInfo] = {}
    items: dict[str, ItemInfo] = {}

    def add(form: FormInfo, ids: list[str], *, optional: set[str] = frozenset(), numeric: set[str] = frozenset()):
        forms[form.id] = form
        for i, item in enumerate(ids, 1):
            items.setdefault(
                item,
                ItemInfo(
                    form=form.id,
                    index=i,
                    total=len(ids),
                    adaptive=form.id in ADAPTIVE,
                    optional=item in optional,
                    numeric=item in numeric,
                ),
            )

    cssrs = load_cssrs_russian()
    add(FormInfo(id="cssrs", title=cssrs.title, section="safety"), ["cssrs_" + i.id for i in cssrs.items])

    intake_forms: dict[str, Any] = content()["forms"]
    for sid, section in (("phq9", "mood"), ("tsq", "trauma"), ("pcl5", "trauma"), ("rus_audit", "alcohol")):
        raw = intake_forms.get(sid) or {}
        scale = load_scale(sid)
        add(
            FormInfo(
                id=sid,
                title=raw.get("title") or scale.title,
                section=section,
                recall_period=raw.get("recall_period") or scale.recall_period,
                instruction=raw.get("instruction") or scale.instruction,
            ),
            list(scale.item_ids),
        )
    add(FormInfo(id="trauma", title="Травматическое событие", section="trauma"), ["trauma", "recent_trauma"])
    add(FormInfo(id="context", title="Общие вопросы", section="about"), ["sex", "tbi", "psychotropics"])

    diary = yaml.safe_load((get_settings().config_dir / "instruments/diary.yaml").read_text(encoding="utf-8"))
    diary_items = [item for key in ("core", "ptsd", "depression", "suicide") for item in diary.get(key, [])]
    add(
        FormInfo(id="diary", title="Дневник самочувствия", section="diary"),
        [i["id"] for i in diary_items],
        optional={i["id"] for i in diary_items if i.get("optional")},
        numeric={i["id"] for i in diary_items if i.get("numeric")},
    )

    # Scales of the onboarding / scheduled sessions (`scale:<id>:...` buttons): the form header only.
    for path in sorted((get_settings().config_dir / "scales").glob("*.yaml")):
        scale = load_scale(path.stem)
        forms.setdefault(
            scale.id,
            FormInfo(
                id=scale.id,
                title=scale.title,
                section="scale",
                recall_period=scale.recall_period,
                instruction=scale.instruction,
            ),
        )
    return Catalog(forms=forms, items=items, standard_drinks=_drinks())