"""Stable Writing-Profile shell. Seed keys are ordering help, not a closed trait schema."""
from __future__ import annotations

import re
from datetime import datetime, timezone

SLUG = re.compile(r"^[a-z][a-z0-9_]{1,62}$")
LIFECYCLE = ("uninitialized", "initial_pending", "confirmed")
LAYERS = ("core", "context", "output")
TRAIT_STATUS = ("active", "merged", "split", "retired")
REF_ROLES = ("evidence", "exemplar")
ORIGINS = ("manual", "imported", "accepted_suggestion", "initial_build")
CONTEXT_HINTS = {
    "vacation_diary": "autobiographical_journal",
    "travel_journal": "autobiographical_journal",
    "autobiographical_journal": "autobiographical_journal",
    "journal": "autobiographical_journal",
    "reflective": "reflective",
}
FACET_ALIASES = {"journal": "autobiographical_journal"}
SEED_FACETS = {
    "core": {"layer": "core", "label": "Globaler Schreibkern"},
    "autobiographical_journal": {"layer": "context", "label": "Autobiografisches Journaling"},
    "reflective": {"layer": "context", "label": "Tiefer reflektierende Texte"},
}
SEED_TRAIT_HINTS = (
    {"slug": "rhythm", "label": "Satzlänge / Rhythmus"},
    {"slug": "detail", "label": "Detailgrad"},
    {"slug": "chronology", "label": "Erzählweise"},
    {"slug": "lexicon", "label": "Wortwahl / typische Formulierungen"},
    {"slug": "humor", "label": "Humor"},
    {"slug": "emotional_directness", "label": "Emotionale Direktheit"},
    {"slug": "transitions", "label": "Typische Übergänge"},
    {"slug": "concreteness", "label": "Zeiten, Orte, Namen"},
    {"slug": "event_vs_reflection", "label": "Ereignis / Reflexion"},
)
LEGACY_STYLE_KEYS = {item["slug"] for item in SEED_TRAIT_HINTS}
EXISTING_BEFORE_NEW = (
    "bestehenden Trait bestätigen",
    "präzisieren",
    "Scope / Core-vs-Facet-Zuordnung ändern",
    "redundante Traits zusammenführen oder sinnvoll aufteilen",
    "erst dann einen neuen Trait anlegen",
    "neue Facet nur bei tatsächlicher semantischer Notwendigkeit",
)
TRAIT_ACTIONS = (
    "keep",
    "update",
    "add",
    "remove",
    "reclassify",
    "merge",
    "split",
    "confirm",
    "precisify",
    "rescope",
    "create",
    "move",
)
ACTION_ALIASES = {
    "keep": "keep",
    "confirm": "keep",
    "update": "update",
    "precisify": "update",
    "add": "add",
    "create": "add",
    "remove": "remove",
    "retire": "remove",
    "reclassify": "reclassify",
    "rescope": "reclassify",
    "move": "reclassify",
    "merge": "merge",
    "split": "split",
}
APPLY_ACTIONS = {
    "keep": "confirm",
    "update": "precisify",
    "add": "create",
    "remove": "remove",
    "reclassify": "rescope",
    "merge": "merge",
    "split": "split",
}
EVIDENCE_BASIS = ("kansho_sources", "external_chat_history", "external_context")
EXTERNAL_EVIDENCE = ("external_chat_history", "external_context")
BASIS_ALIASES = {
    "kansho_sources": "kansho_sources",
    "kansho": "kansho_sources",
    "external_chat_history": "external_chat_history",
    "external_context": "external_context",
    "external": "external_context",
    "dayone_export": "external_context",
    "day_one": "external_context",
    "dayone": "external_context",
}
ANALYSIS_MODES = ("initial_build", "review")
META_STYLE_MARKERS = (
    "explizite nutzer-review",
    "expliziter initial profile build",
    "explizite nutzer-review des writing profile",
    "expliziter initialer profilaufbau",
)


def normalize_facet_key(key: str | None) -> str:
    raw = (key or "").strip()
    return FACET_ALIASES.get(raw, raw)


def facet_label(key: str) -> str:
    item = SEED_FACETS.get(normalize_facet_key(key))
    if item:
        return item["label"]
    return key.replace("_", " ")


def facet_layer(key: str, fallback: str = "context") -> str:
    item = SEED_FACETS.get(normalize_facet_key(key))
    if item:
        return item["layer"]
    return fallback if fallback in LAYERS else "context"


def valid_slug(value: str | None) -> bool:
    return bool(value and SLUG.match(value))


def coerce_slug(value: str, fallback: str = "trait") -> str:
    raw = (value or "").strip().lower().replace("-", "_").replace(" ", "_")
    cleaned = re.sub(r"[^a-z0-9_]", "", raw)
    if valid_slug(cleaned):
        return cleaned
    return fallback


def hint_for_context(context_hint: str | None) -> str:
    raw = (context_hint or "").strip().lower()
    return CONTEXT_HINTS.get(raw, raw)


def parse_when(raw: str | None) -> datetime | None:
    text = (raw or "").strip()
    if not text:
        return None
    try:
        stamp = datetime.fromisoformat(text.replace("Z", "+00:00"))
    except ValueError:
        try:
            stamp = datetime.strptime(text[:10], "%Y-%m-%d")
        except ValueError:
            return None
    if stamp.tzinfo is None:
        stamp = stamp.replace(tzinfo=timezone.utc)
    return stamp


def recency_weight(occurred_at: str | None, now: datetime | None = None) -> float:
    """Newer texts weigh more for current expression; older texts stay as long-term evidence."""
    stamp = parse_when(occurred_at)
    if not stamp:
        return 1.0
    current = now or datetime.now(timezone.utc)
    days = max((current - stamp).days, 0)
    if days <= 90:
        return 1.25
    if days <= 365:
        return 1.0
    if days <= 1100:
        return 0.75
    return 0.55


def recency_role(occurred_at: str | None, now: datetime | None = None) -> str:
    stamp = parse_when(occurred_at)
    if not stamp:
        return "undated"
    current = now or datetime.now(timezone.utc)
    days = max((current - stamp).days, 0)
    if days <= 365:
        return "current_expression"
    return "long_term"


def is_meta_style_text(text: str | None) -> bool:
    raw = (text or "").strip().lower()
    if not raw:
        return True
    if len(raw.split()) <= 24 and any(marker in raw for marker in META_STYLE_MARKERS):
        return True
    return False


def normalize_evidence_basis(raw) -> list[str]:
    values = raw if isinstance(raw, list) else [raw] if raw else []
    out: list[str] = []
    seen: set[str] = set()
    for item in values:
        key = str(item or "").strip().lower().replace("-", "_").replace(" ", "_")
        if not key:
            continue
        mapped = BASIS_ALIASES.get(key)
        if not mapped:
            mapped = "kansho_sources" if key.startswith("kansho") else "external_context"
        if mapped in seen:
            continue
        seen.add(mapped)
        out.append(mapped)
    return out


def is_external_only(basis) -> bool:
    values = list(basis or [])
    return bool(values) and "kansho_sources" not in values


def normalize_mode(value: str | None) -> str:
    raw = (value or "").strip()
    if raw in {"incremental", "review"}:
        return "review"
    if raw == "initial_build":
        return "initial_build"
    return ""


def seed_catalog() -> list[dict]:
    return [
        {
            "kind": "facet",
            "key": key,
            "layer": item["layer"],
            "label": item["label"],
            "role": "ordering_help",
        }
        for key, item in SEED_FACETS.items()
    ] + [
        {
            "kind": "trait_hint",
            "slug": item["slug"],
            "label": item["label"],
            "role": "ordering_help",
        }
        for item in SEED_TRAIT_HINTS
    ]