"""
Input coercion layer — turns the frontend `ScoutPrefs` (JSON dict) into each board
actor's exact input schema. See `docs/ENGINE_DESIGN.md` §1.2.

All maps verified against the live Apify input schemas (2026-06-17).
GOLDEN RULE: a value that doesn't resolve to a board enum/code is NEVER sent as an
invalid enum — it degrades to a keyword fold (or post-filter) and is flagged.
Coverage gaps lose precision, never the call.
"""
from __future__ import annotations
import re
from typing import Any, Optional

Prefs = dict[str, Any]

# ── lookup maps (verified codes/enums) ───────────────────────────────────────
COUNTRY_ISO2 = {  # Indeed `country`
    "India": "IN", "United States": "US", "United Kingdom": "GB", "Canada": "CA",
    "Australia": "AU", "Germany": "DE", "Singapore": "SG", "UAE": "AE",
}
WORKMODE_NAUKRI = {"Remote": "remote", "Hybrid": "hybrid", "On-site": "office"}
WORKMODE_LINKEDIN = {"Remote": "remote", "Hybrid": "hybrid", "On-site": "office"}

SENIORITY_YEARS = {"Fresher": 0, "Junior": 2, "Mid-level": 5, "Senior": 9, "Lead": 13}
SENIORITY_LINKEDIN = {  # LinkedIn `experienceLevel`
    "Fresher": "entry", "Junior": "associate", "Mid-level": "mid-senior",
    "Senior": "director", "Lead": "executive",
}
COMP_NAUKRI_SALARY = {  # ₹ band → Naukri `salaryRange` (lakhs bucket)
    "₹10–14L": "10to15", "₹14–18L": "15to25", "₹16–22L": "15to25",
    "₹22–30L": "25to50", "₹30L+": "50to75",
}
COMPANY_TYPE_NAUKRI = {  # loose — funding stage ≠ company type
    "Seed / early": "Startup", "Growth-stage": "Startup",
    "Late / pre-IPO": "Corporate", "Enterprise": "MNC",
}

# Naukri numeric codes (labels are display-only — the actor wants the code)
ROLE_NAUKRI_DEPT = {  # role area → `department`
    "Product": 10, "Engineering": 5, "Design": 15, "Data": 3,
    "Marketing": 9, "Sales": 14, "Ops": 2,  # "Open to any" → omit
}
INDUSTRY_NAUKRI = {  # → `industry`
    "Fintech": 114, "SaaS": 110, "E-commerce": 108, "EdTech": 133,
    "HealthTech": 131, "Dev tools": 110, "Consulting": 126,
}
CITY_NAUKRI = {  # → `cities` (1→N for metro regions)
    "Bengaluru": [97], "Bangalore": [97], "Mumbai": [134], "New Delhi": [6], "Delhi": [6],
    "Delhi NCR": [6, 73, 220, 350], "Gurgaon": [73], "Gurugram": [73], "Noida": [220],
    "Hyderabad": [17], "Chennai": [183], "Pune": [139], "Kolkata": [232],
}
# LinkedIn industry IDs — best-effort, TODO verify vs LinkedIn taxonomy; unmapped → keyword fold
INDUSTRY_LINKEDIN_ID = {
    "Fintech": "1742", "SaaS": "4", "E-commerce": "6", "EdTech": "68",
    "HealthTech": "14", "Dev tools": "4", "Consulting": "11",
}

# ── parsing + accessors ──────────────────────────────────────────────────────
def parse_location(loc: str) -> dict:
    """'Bengaluru · India' → {city, country, remote, anywhere}."""
    s = (loc or "").strip()
    low = s.lower()
    if low == "remote":
        return {"city": None, "country": None, "remote": True, "anywhere": False}
    if low in ("anywhere", ""):
        return {"city": None, "country": None, "remote": False, "anywhere": True}
    parts = [p.strip() for p in re.split(r"[·,]", s) if p.strip()]
    return {
        "city": parts[0] if parts else None,
        "country": parts[1] if len(parts) > 1 else None,
        "remote": False, "anywhere": False,
    }

def parsed_locations(prefs: Prefs) -> list[dict]:
    locs = [parse_location(l) for l in (prefs.get("location") or [])]
    return locs or [{"city": None, "country": None, "remote": False, "anywhere": True}]

def is_remote(prefs: Prefs) -> bool:
    return any(l["remote"] for l in parsed_locations(prefs)) or "Remote" in (prefs.get("workMode") or [])

def title_of(prefs: Prefs) -> str:
    """Keyword precedence: specific fine-tune pick → typed title → first concrete role."""
    tt = prefs.get("targetTitles") or []
    if tt:
        return tt[0]
    if (prefs.get("title") or "").strip():
        return prefs["title"].strip()
    for r in (prefs.get("role") or []):
        if r and r != "Open to any":
            return r
    return ""

def seniority_band(prefs: Prefs) -> Optional[str]:
    exp = prefs.get("experience") or []
    return exp[0] if exp else None

def years_of(prefs: Prefs) -> Optional[int]:
    """Numeric years: explicit `years` → else derived from the seniority band."""
    y = prefs.get("years")
    if isinstance(y, (int, float)):
        return max(0, min(30, int(y)))
    b = seniority_band(prefs)
    return SENIORITY_YEARS.get(b) if b else None

def build_keyword(prefs: Prefs, *, seniority: bool = False, industry: bool = False) -> str:
    """Composite keyword for boards lacking department/industry filters."""
    parts: list[str] = []
    if seniority and seniority_band(prefs) in ("Senior", "Lead"):
        parts.append(seniority_band(prefs))  # prefix only the high bands
    parts.append(title_of(prefs))
    if industry:
        inds = prefs.get("industry") or []
        if inds and inds[0] not in ("Any", None):
            parts.append(inds[0])
    return " ".join(p for p in parts if p).strip()

def has_mvq(prefs: Prefs) -> bool:
    """Minimum Viable Query = a title + a resolvable location (city/country/remote)."""
    if not title_of(prefs):
        return False
    return any(l["city"] or l["country"] or l["remote"] for l in parsed_locations(prefs))