"""skin.land scrape worker (pull model).

A thin strategy over blworker.Worker, mirroring the cs.money worker — it supplies only the
skin.land-specific bits; the warm session, poll/scrape/post loop, IPRoyal proxy, IP
rotation, logging and shutdown all live in the shared runtime. Env knobs: worker/README.md.

How skin.land is scraped (learned from the discovery probes):
  - A job's target is the market PAGE URL, e.g.
    https://skin.land/market/csgo/ak-47-redline-field-tested/
  - That Nuxt page embeds an internal numeric skin_id. We resolve it once from the page's
    __NUXT__ payload (the skin object whose `url` == the page slug), cache it per slug, then
    page the clean JSON API:
        GET https://app.skin.land/api/v2/obtained-skins?skin_id={id}&page={n}
    which returns a Laravel paginator {data:[...offers], meta:{current_page,last_page,…}}.
  - We walk pages 1..last_page (capped by the job's maxPages), dedup offers by id, and post.

    cd worker
    .venv\\Scripts\\Activate.ps1
    pip install -r requirements.txt
    python skinland_worker.py
"""

import json
import re

from blworker import ScrapeResult, Worker, click, looks_like_challenge, page_fetch, run

# The offers API. skin_id is skin.land's internal id (resolved from the page); page is the
# Laravel paginator page. Same warm session, fetched in-page (CORS-allowed app subdomain).
API = "https://app.skin.land/api/v2/obtained-skins?skin_id={skin_id}&page={page}"

# The page's Nuxt payload is a devalue flat array; the main skin object is the one whose
# `url` field resolves to the page slug, and its `id` field resolves to the skin_id.
NUXT_ARRAY_RE = re.compile(r'\[\["(?:ShallowReactive|Reactive)",\d+\]')


def slug_of(url: str) -> str:
    return url.rstrip("/").rsplit("/", 1)[-1]


def extract_nuxt_array(html: str):
    """Pull the Nuxt devalue payload (a JSON flat array of values with index references)
    out of the page HTML. Returns the parsed list, or None."""
    m = NUXT_ARRAY_RE.search(html)
    if not m:
        return None
    start = m.start()
    depth = 0
    instr = False
    esc = False
    for i in range(start, len(html)):
        ch = html[i]
        if esc:
            esc = False
            continue
        if ch == "\\":
            esc = True
            continue
        if ch == '"':
            instr = not instr
            continue
        if instr:
            continue
        if ch == "[":
            depth += 1
        elif ch == "]":
            depth -= 1
            if depth == 0:
                try:
                    return json.loads(html[start:i + 1])
                except json.JSONDecodeError:
                    return None
    return None


def resolve_skin_id(html: str, slug: str) -> int | None:
    """Find the page's main skin object in the Nuxt payload — the dict whose `url` field
    resolves to the page slug — and return its resolved `id` (skin.land's internal skin_id
    used by the obtained-skins API)."""
    arr = extract_nuxt_array(html)
    if not arr:
        return None

    def val(ref):
        return arr[ref] if isinstance(ref, int) and 0 <= ref < len(arr) else ref

    for el in arr:
        if isinstance(el, dict) and "url" in el and "id" in el and val(el["url"]) == slug:
            sid = val(el["id"])
            if isinstance(sid, int):
                return sid
    return None


class SkinLandWorker(Worker):
    name = "skinland"
    jobs_path = "/skinland/jobs"
    default_market_url = "https://skin.land/market/csgo/"

    def __init__(self, settings):
        super().__init__(settings)
        # skin_id is stable per skin+wear, so cache it per slug to skip the ~page fetch on
        # re-sweeps.
        self._skin_id_cache: dict[str, int] = {}

    def describe_job(self, job) -> str:
        return slug_of(job["url"])

    async def dismiss_consent(self, page) -> str | None:
        """Privacy-preserving: dismiss the cookie banner with essential-only if present."""
        for label in ("Accept essential", "ACCEPT ESSENTIAL", "Reject all"):
            if await click(page, label):
                return f"dismissed via {label!r}"
        return None

    async def _get_skin_id(self, page, job, slug: str) -> tuple[int | None, str, int]:
        """Resolve (and cache) skin.land's skin_id for this slug. Returns
        (skin_id, reason, wire); reason is "" on success, else a partial-stop reason."""
        if slug in self._skin_id_cache:
            return self._skin_id_cache[slug], "", 0

        _status, html, wire = await page_fetch(page, job["url"], accept="text/html")
        if looks_like_challenge(html):
            return None, "challenged", max(wire, 0)
        skin_id = resolve_skin_id(html, slug)
        if skin_id is None:
            return None, "no-skin-id", max(wire, 0)
        self._skin_id_cache[slug] = skin_id
        return skin_id, "", max(wire, 0)

    async def scrape_job(self, page, job) -> ScrapeResult:
        """Scrape ALL offers for one skin+wear by paging the obtained-skins API."""
        slug = slug_of(job["url"])
        max_pages = job.get("maxPages", 40)

        skin_id, reason, wire = await self._get_skin_id(page, job, slug)
        if skin_id is None:
            return ScrapeResult([], 0, reason, wire)

        seen: dict = {}
        fetches = 0
        page_n = 1
        reason = "completed"
        while page_n <= max_pages:
            _status, body, wbytes = await page_fetch(page, API.format(skin_id=skin_id, page=page_n))
            fetches += 1
            if wbytes > 0:
                wire += wbytes

            if looks_like_challenge(body):
                return ScrapeResult(list(seen.values()), fetches, "challenged", wire)
            try:
                payload = json.loads(body)
            except json.JSONDecodeError:
                return ScrapeResult(list(seen.values()), fetches, "bad-json", wire)

            for o in payload.get("data") or []:
                if o.get("id") is not None:
                    seen[o["id"]] = o

            meta = payload.get("meta") or {}
            last = meta.get("last_page")
            if not payload.get("data") or (isinstance(last, int) and page_n >= last):
                break  # walked the final page
            page_n += 1
            await self._pace(page)
        else:
            reason = "fetch-cap"

        return ScrapeResult(list(seen.values()), fetches, reason, wire)


if __name__ == "__main__":
    run(SkinLandWorker)