"""How do you download a gizmo-scoped file?

metadata_diff.py found the discriminator: every refused image carries
``use_case: "gizmo"`` (ChatGPT's name for Projects and custom GPTs), while
everything that downloads is ``image_gen`` or ``multimodal``. The files are
healthy — ``state: "ready"`` — so this is not loss, it is the plain
/files/{id}/download endpoint declining to serve a project-scoped file.

So find the call that works. Two parts:

1. Dump the raw conversation node carrying one of these images. The part dict
   may name the scope the download needs (a gizmo id, a file token, a
   conversation id) — cheaper than guessing.

2. Try the plausible variants and print what each returns:
     ?gizmo_id=<each configured project>      scope by query param
     ?conversation_id=<the conversation>      scope by conversation
     /gizmos/{gizmo}/files/{id}/download      scope by path
     Referer: the project URL                 scope by origin

Anything that returns 200 is the fix, and the exporter can adopt it.

Run from the project root:

    python tools/gizmo_download_probe.py
"""

import json
import os
import re
import sys
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parent.parent))

from dotenv import load_dotenv

load_dotenv()

from src.providers.chatgpt import BASE_URL, ChatGPTProvider, parse_asset_file_id  # noqa: E402
from src.utils import redact_secrets  # noqa: E402

DEAD_RE = re.compile(r"🖼️ \*\*Image attached\*\* — `([^`]+)`\s*\(([^)]*)\)")
CONV_ID_RE = re.compile(r"^conversation_id:\s*(\S+)", re.MULTILINE)


def find_candidates(export_dir: Path) -> list[tuple[str, str, str]]:
    """(file_id, conversation_id, export filename) for images that failed."""
    out = []
    for md in export_dir.rglob("*.md"):
        try:
            text = md.read_text(encoding="utf-8", errors="replace")
        except OSError:
            continue
        conv_match = CONV_ID_RE.search(text)
        if not conv_match:
            continue
        for ref, _meta in DEAD_RE.findall(text):
            file_id = parse_asset_file_id(ref)
            if file_id:
                out.append((file_id, conv_match.group(1), md.name))
    return out


def is_gizmo_scoped(provider, file_id: str) -> bool:
    provider._pace()
    resp = provider._session.request("GET", f"{BASE_URL}/files/{file_id}", timeout=30)
    if resp.status_code != 200:
        return False
    try:
        return resp.json().get("use_case") == "gizmo"
    except Exception:  # noqa: BLE001 - diagnostic
        return False


def dump_conversation_node(provider, conv_id: str, file_id: str) -> str | None:
    """Print the raw part carrying this asset. Returns a gizmo id if found."""
    try:
        raw = provider.get_conversation(conv_id)
    except Exception as e:  # noqa: BLE001 - diagnostic
        print(f"  could not fetch conversation: {e}")
        return None

    gizmo_id = raw.get("gizmo_id") or raw.get("conversation_template_id")
    print(f"  conversation gizmo_id       : {gizmo_id}")
    print(f"  conversation keys           : {sorted(raw.keys())}")

    for node_id, node in (raw.get("mapping") or {}).items():
        message = node.get("message") or {}
        content = message.get("content") or {}
        candidates = []
        if content.get("content_type") == "image_asset_pointer":
            candidates.append(content)
        for part in content.get("parts") or []:
            if isinstance(part, dict):
                candidates.append(part)
        for part in candidates:
            pointer = part.get("asset_pointer") or ""
            if file_id in pointer:
                print(f"\n  --- raw part on node {node_id} ---")
                print(json.dumps(redact_secrets(part), indent=4, default=str)[:1800])
                meta = message.get("metadata") or {}
                interesting = {
                    k: v for k, v in meta.items()
                    if any(t in k for t in ("gizmo", "file", "attach", "source"))
                }
                if interesting:
                    print(f"\n  --- message.metadata (filtered) ---")
                    print(json.dumps(redact_secrets(interesting), indent=4, default=str)[:1200])
                return gizmo_id
    print("  (asset not found in the conversation mapping)")
    return gizmo_id


def try_variants(provider, file_id: str, conv_id: str, gizmo_id: str | None) -> None:
    project_ids = [p for p in provider._project_ids]
    if gizmo_id and gizmo_id not in project_ids:
        project_ids.insert(0, gizmo_id)

    base = f"{BASE_URL}/files/{file_id}/download"

    def show(label: str, url: str, headers: dict | None = None) -> None:
        try:
            provider._pace()
            resp = provider._session.request("GET", url, headers=headers, timeout=30)
        except Exception as e:  # noqa: BLE001 - diagnostic
            print(f"    {label:<52} error {type(e).__name__}")
            return
        note = ""
        if resp.status_code == 200:
            try:
                note = " ← WORKS" if resp.json().get("download_url") else " (200, no download_url)"
            except Exception:  # noqa: BLE001 - diagnostic
                note = " ← WORKS (non-JSON)"
        print(f"    {label:<52} {resp.status_code}{note}")

    print("\n  --- variants ---")
    show("baseline", base)
    show("?conversation_id", f"{base}?conversation_id={conv_id}")
    for pid in project_ids[:6]:
        show(f"?gizmo_id={pid[:22]}…", f"{base}?gizmo_id={pid}")
    for pid in project_ids[:2]:
        show(
            f"/gizmos/{pid[:16]}…/files/…/download",
            f"{BASE_URL}/gizmos/{pid}/files/{file_id}/download",
        )
    if gizmo_id:
        show(
            "Referer: project URL",
            base,
            {"Referer": f"https://chatgpt.com/g/{gizmo_id}/project"},
        )


def main() -> None:
    export_dir = Path(os.getenv("EXPORT_DIR", "./exports")).expanduser()
    candidates = find_candidates(export_dir)
    if not candidates:
        print(f"no failed images found under {export_dir}")
        return

    provider = ChatGPTProvider()
    print(f"configured project ids: {len(provider._project_ids)}")

    tested = 0
    for file_id, conv_id, md_name in candidates:
        if not is_gizmo_scoped(provider, file_id):
            continue
        print()
        print("=" * 78)
        print(f"{file_id}")
        print(f"  from {md_name}")
        print("=" * 78)
        gizmo_id = dump_conversation_node(provider, conv_id, file_id)
        try_variants(provider, file_id, conv_id, gizmo_id)
        tested += 1
        if tested >= 2:
            break

    if not tested:
        print("no gizmo-scoped failures found — nothing to probe")


if __name__ == "__main__":
    main()