from __future__ import annotations

import importlib
import os
import re
import sys
from pathlib import Path
from typing import Any, Dict, List, Optional

from urllib.parse import quote, urlparse

from ProviderCore.base import Provider, SearchResult
from ProviderCore.download import sanitize_filename
from SYS.logger import log


def _ia() -> Any:
    try:
        return importlib.import_module("internetarchive")
    except Exception as exc:
        raise Exception(f"internetarchive module not available: {exc}")


def _pick_provider_config(config: Any) -> Dict[str, Any]:
    if not isinstance(config, dict):
        return {}
    provider = config.get("provider")
    if not isinstance(provider, dict):
        return {}
    entry = provider.get("internetarchive")
    if isinstance(entry, dict):
        return entry
    return {}


def _looks_fielded_query(q: str) -> bool:
    low = (q or "").lower()
    return (":" in low) or (" and " in low) or (" or " in low) or (" not " in low) or ("(" in low)


def _extract_identifier_from_any(value: str) -> str:
    raw = str(value or "").strip()
    if not raw:
        return ""

    if raw.lower().startswith("ia:"):
        return raw.split(":", 1)[1].strip()

    if raw.startswith("http://") or raw.startswith("https://"):
        try:
            from urllib.parse import urlparse

            p = urlparse(raw)
            host = (p.hostname or "").lower().strip()
            path = (p.path or "").strip("/")
        except Exception:
            return ""

        if not host.endswith("archive.org"):
            return ""

        parts = [x for x in path.split("/") if x]
        # /details/<identifier>
        if len(parts) >= 2 and parts[0].lower() == "details":
            return str(parts[1]).strip()
        # /download/<identifier>/<filename>
        if len(parts) >= 2 and parts[0].lower() == "download":
            return str(parts[1]).strip()

        return ""

    # Assume bare identifier
    return raw


def extract_identifier(value: str) -> str:
    """Public wrapper for extracting an IA identifier from URLs/tags/bare ids."""
    return _extract_identifier_from_any(value)


def is_details_url(url: str) -> bool:
    raw = str(url or "").strip()
    if not raw:
        return False
    if not (raw.startswith("http://") or raw.startswith("https://")):
        return False
    try:
        p = urlparse(raw)
        host = (p.hostname or "").lower().strip()
        parts = [x for x in (p.path or "").split("/") if x]
    except Exception:
        return False
    if not host.endswith("archive.org"):
        return False
    return len(parts) >= 2 and parts[0].lower() == "details" and bool(parts[1].strip())


def is_download_file_url(url: str) -> bool:
    raw = str(url or "").strip()
    if not raw:
        return False
    if not (raw.startswith("http://") or raw.startswith("https://")):
        return False
    try:
        p = urlparse(raw)
        host = (p.hostname or "").lower().strip()
        parts = [x for x in (p.path or "").split("/") if x]
    except Exception:
        return False
    if not host.endswith("archive.org"):
        return False
    # /download/<identifier>/<filename>
    return (
        len(parts) >= 3
        and parts[0].lower() == "download"
        and bool(parts[1].strip())
        and bool(parts[2].strip())
    )


def list_download_files(identifier: str) -> List[Dict[str, Any]]:
    """Return a sorted list of downloadable files for an IA identifier.

    Each entry includes: name, size, format, source, direct_url.
    """
    ident = str(identifier or "").strip()
    if not ident:
        return []

    ia = _ia()
    get_item = getattr(ia, "get_item", None)
    if not callable(get_item):
        raise Exception("internetarchive.get_item is not available")

    try:
        item: Any = get_item(str(ident))
    except Exception as exc:
        raise Exception(f"Internet Archive item lookup failed: {exc}")

    files: List[Dict[str, Any]] = []
    try:
        raw_files = getattr(item, "files", None)
        if isinstance(raw_files, list):
            for f in raw_files:
                if isinstance(f, dict):
                    files.append(f)
    except Exception:
        files = []

    if not files:
        try:
            for f in item.get_files():
                name = getattr(f, "name", None)
                if not name and isinstance(f, dict):
                    name = f.get("name")
                if not name:
                    continue
                files.append(
                    {
                        "name": str(name),
                        "size": getattr(f, "size", None),
                        "format": getattr(f, "format", None),
                        "source": getattr(f, "source", None),
                    }
                )
        except Exception:
            files = []

    if not files:
        return []

    def _is_ia_metadata_file(f: Dict[str, Any]) -> bool:
        try:
            source = str(f.get("source") or "").strip().lower()
            fmt = str(f.get("format") or "").strip().lower()
        except Exception:
            source = ""
            fmt = ""

        if source == "metadata":
            return True
        if fmt in {"metadata", "archive bittorrent"}:
            return True
        if fmt.startswith("thumbnail"):
            return True
        return False

    candidates = [f for f in files if isinstance(f, dict) and not _is_ia_metadata_file(f)]
    if not candidates:
        candidates = [f for f in files if isinstance(f, dict)]

    out: List[Dict[str, Any]] = []
    for f in candidates:
        name = str(f.get("name") or "").strip()
        if not name:
            continue

        direct_url = f"https://archive.org/download/{ident}/{quote(name, safe='')}"
        out.append(
            {
                "name": name,
                "size": f.get("size"),
                "format": f.get("format"),
                "source": f.get("source"),
                "direct_url": direct_url,
            }
        )

    def _key(f: Dict[str, Any]) -> tuple[str, str]:
        fmt = str(f.get("format") or "").strip().lower()
        name = str(f.get("name") or "").strip().lower()
        return (fmt, name)

    out.sort(key=_key)
    return out


def _extract_download_filename_from_url(url: str) -> str:
    raw = str(url or "").strip()
    if not raw:
        return ""
    if not (raw.startswith("http://") or raw.startswith("https://")):
        return ""

    try:
        from urllib.parse import urlparse

        p = urlparse(raw)
        host = (p.hostname or "").lower().strip()
        path = (p.path or "").strip("/")
    except Exception:
        return ""

    if not host.endswith("archive.org"):
        return ""

    parts = [x for x in path.split("/") if x]
    # /download/<identifier>/<filename>
    if len(parts) >= 3 and parts[0].lower() == "download":
        return str(parts[2]).strip()

    return ""


def _normalize_identifier(s: str) -> str:
    text = str(s or "").strip().lower()
    if not text:
        return ""

    # Internet Archive identifiers are fairly permissive; keep alnum, '_', '-', '.' and collapse the rest.
    text = re.sub(r"[^a-z0-9_.-]+", "-", text)
    text = re.sub(r"-+", "-", text).strip("-._")

    if len(text) > 80:
        text = text[:80].rstrip("-._")

    return text


def _best_file_candidate(files: List[Dict[str, Any]]) -> Optional[Dict[str, Any]]:
    if not files:
        return None

    def _is_metadata(f: Dict[str, Any]) -> bool:
        source = str(f.get("source") or "").strip().lower()
        fmt = str(f.get("format") or "").strip().lower()
        if source == "metadata":
            return True
        if fmt in {"metadata", "archive bittorrent"}:
            return True
        if fmt.startswith("thumbnail"):
            return True
        return False

    def _size(f: Dict[str, Any]) -> int:
        try:
            return int(f.get("size") or 0)
        except Exception:
            return 0

    candidates = [f for f in files if not _is_metadata(f)]
    if not candidates:
        candidates = list(files)

    # Prefer originals.
    originals = [f for f in candidates if str(f.get("source") or "").strip().lower() == "original"]
    pool = originals if originals else candidates

    pool = [f for f in pool if str(f.get("name") or "").strip()]
    if not pool:
        return None

    pool.sort(key=_size, reverse=True)
    return pool[0]


class InternetArchive(Provider):
    """Internet Archive provider using the `internetarchive` Python module.

    Supports:
    - search-provider -provider internetarchive <query>
    - download-file / provider.download() from search results
    - add-file -provider internetarchive (uploads)

    Config (optional):
    [provider=internetarchive]
    access_key="..."   # optional (upload)
    secret_key="..."   # optional (upload)
    collection="..."   # optional (upload)
    mediatype="..."    # optional (upload)
    """

    def __init__(self, config: Optional[Dict[str, Any]] = None):
        super().__init__(config)
        conf = _pick_provider_config(self.config)
        self._access_key = conf.get("access_key")
        self._secret_key = conf.get("secret_key")
        self._collection = conf.get("collection") or conf.get("default_collection")
        self._mediatype = conf.get("mediatype") or conf.get("default_mediatype")

    def validate(self) -> bool:
        try:
            _ia()
            return True
        except Exception:
            return False

    @staticmethod
    def _media_kind_from_mediatype(mediatype: str) -> str:
        mt = str(mediatype or "").strip().lower()
        if mt in {"texts"}:
            return "book"
        if mt in {"audio", "etree"}:
            return "audio"
        if mt in {"movies"}:
            return "video"
        if mt in {"image"}:
            return "image"
        return "file"

    def search(
        self,
        query: str,
        limit: int = 50,
        filters: Optional[Dict[str, Any]] = None,
        **_kwargs: Any,
    ) -> List[SearchResult]:
        ia = _ia()
        search_items = getattr(ia, "search_items", None)
        if not callable(search_items):
            raise Exception("internetarchive.search_items is not available")

        q = str(query or "").strip()
        if not q:
            return []

        # If the user supplied a plain string, default to title search.
        if not _looks_fielded_query(q) and q not in {"*", "*.*"}:
            q = f'title:("{q}")'

        fields = [
            "identifier",
            "title",
            "mediatype",
            "creator",
            "date",
            "collection",
        ]

        try:
            search: Any = search_items(q, fields=fields)
        except Exception as exc:
            raise Exception(f"Internet Archive search failed: {exc}")

        out: List[SearchResult] = []
        for row in search:
            if len(out) >= int(limit or 50):
                break

            if not isinstance(row, dict):
                continue

            identifier = str(row.get("identifier") or "").strip()
            if not identifier:
                continue

            title = str(row.get("title") or identifier).strip() or identifier
            mediatype = str(row.get("mediatype") or "").strip()
            creator_raw = row.get("creator")
            if isinstance(creator_raw, list):
                creator = ", ".join(str(x) for x in creator_raw if x)
            else:
                creator = str(creator_raw or "").strip()
            date = str(row.get("date") or "").strip()

            annotations: List[str] = []
            if mediatype:
                annotations.append(mediatype)
            if date:
                annotations.append(date)
            if creator:
                annotations.append(creator)

            detail_parts: List[str] = []
            if creator:
                detail_parts.append(creator)
            if date:
                detail_parts.append(date)

            path = f"https://archive.org/details/{identifier}"

            sr = SearchResult(
                table="internetarchive",
                title=title,
                path=path,
                detail=" · ".join(detail_parts),
                annotations=annotations,
                media_kind=self._media_kind_from_mediatype(mediatype),
                size_bytes=None,
                tag=set(),
                columns=[
                    ("title", title),
                    ("mediatype", mediatype),
                    ("date", date),
                    ("creator", creator),
                ],
                full_metadata=dict(row),
            )
            out.append(sr)

        return out

    def download_url(self, url: str, output_dir: Path) -> Optional[Path]:
        """Download an Internet Archive URL.

        Supports:
        - https://archive.org/details/<identifier>
        - https://archive.org/download/<identifier>/<filename>
        """
        sr = SearchResult(table="internetarchive", title=str(url), path=str(url), full_metadata={})
        return self.download(sr, output_dir)

    def download(self, result: SearchResult, output_dir: Path) -> Optional[Path]:
        ia = _ia()
        get_item = getattr(ia, "get_item", None)
        download_fn = getattr(ia, "download", None)
        if not callable(get_item):
            raise Exception("internetarchive.get_item is not available")
        if not callable(download_fn):
            raise Exception("internetarchive.download is not available")

        identifier = _extract_identifier_from_any(str(getattr(result, "path", "") or ""))
        if not identifier:
            return None

        requested_filename = ""
        try:
            requested_filename = _extract_download_filename_from_url(str(result.path))
        except Exception:
            requested_filename = ""

        try:
            output_dir.mkdir(parents=True, exist_ok=True)
        except Exception:
            pass

        try:
            item: Any = get_item(identifier)
        except Exception as exc:
            raise Exception(f"Internet Archive item lookup failed: {exc}")

        files: List[Dict[str, Any]] = []
        try:
            raw_files = getattr(item, "files", None)
            if isinstance(raw_files, list):
                for f in raw_files:
                    if isinstance(f, dict):
                        files.append(f)
        except Exception:
            files = []

        if not files:
            try:
                for f in item.get_files():
                    name = getattr(f, "name", None)
                    if not name and isinstance(f, dict):
                        name = f.get("name")
                    if not name:
                        continue
                    files.append(
                        {
                            "name": str(name),
                            "size": getattr(f, "size", None),
                            "format": getattr(f, "format", None),
                            "source": getattr(f, "source", None),
                        }
                    )
            except Exception:
                files = []

        chosen_name = ""
        if requested_filename:
            chosen_name = requested_filename
        else:
            chosen = _best_file_candidate(files)
            if chosen is not None:
                chosen_name = str(chosen.get("name") or "").strip()

        if not chosen_name:
            raise Exception("Internet Archive item has no downloadable files")

        # Download the selected file.
        try:
            download_fn(
                identifier,
                files=[chosen_name],
                destdir=str(output_dir),
                no_directory=True,
                ignore_existing=True,
                verbose=False,
            )
        except TypeError:
            # Older versions may not support some flags.
            download_fn(
                identifier,
                files=[chosen_name],
                destdir=str(output_dir),
            )
        except Exception as exc:
            raise Exception(f"Internet Archive download failed: {exc}")

        # Resolve downloaded path (library behavior varies by version/flags).
        candidates = [
            output_dir / chosen_name,
            output_dir / identifier / chosen_name,
        ]
        for p in candidates:
            try:
                if p.exists():
                    return p
            except Exception:
                continue

        # As a last resort, try to find by basename.
        try:
            for root in (output_dir, output_dir / identifier):
                if root.exists() and root.is_dir():
                    for child in root.iterdir():
                        if child.is_file() and child.name == chosen_name:
                            return child
        except Exception:
            pass

        return None

    def upload(self, file_path: str, **kwargs: Any) -> str:
        """Upload a file to Internet Archive.

        If a piped item includes a tag `ia:<identifier>`, uploads to that identifier.
        Otherwise creates a new identifier derived from the filename/title and hash.

        Returns the item URL.
        """
        ia = _ia()
        upload_fn = getattr(ia, "upload", None)
        if not callable(upload_fn):
            raise Exception("internetarchive.upload is not available")

        p = Path(str(file_path))
        if not p.exists():
            raise FileNotFoundError(f"File not found: {file_path}")

        pipe_obj = kwargs.get("pipe_obj")

        title = ""
        file_hash = ""
        tags: List[str] = []
        try:
            if pipe_obj is not None:
                title = str(getattr(pipe_obj, "title", "") or "").strip()
                file_hash = str(getattr(pipe_obj, "hash", "") or "").strip()
                tags_val = getattr(pipe_obj, "tag", None)
                if isinstance(tags_val, list):
                    tags = [str(t) for t in tags_val if t]
        except Exception:
            title = ""
            file_hash = ""
            tags = []

        identifier = ""
        for t in tags:
            low = str(t or "").strip()
            if low.lower().startswith("ia:"):
                identifier = low.split(":", 1)[1].strip()
                break
            if low.lower().startswith("internetarchive:"):
                identifier = low.split(":", 1)[1].strip()
                break

        if not identifier:
            base_title = title or p.stem
            slug = _normalize_identifier(base_title)
            suffix = ""
            if file_hash:
                suffix = str(file_hash)[:10]
            if slug and suffix:
                identifier = f"{slug}-{suffix}"
            elif slug:
                identifier = slug
            elif suffix:
                identifier = f"medeia-{suffix}"
            else:
                identifier = _normalize_identifier(p.stem) or "medeia-upload"

        identifier = _normalize_identifier(identifier)
        if not identifier:
            raise Exception("Could not determine Internet Archive identifier")

        meta: Dict[str, Any] = {}
        if title:
            meta["title"] = title
        else:
            meta["title"] = p.stem

        if isinstance(self._collection, str) and self._collection.strip():
            meta["collection"] = self._collection.strip()
        if isinstance(self._mediatype, str) and self._mediatype.strip():
            meta["mediatype"] = self._mediatype.strip()

        # Build upload options; credentials are optional if the user has internetarchive configured globally.
        upload_kwargs: Dict[str, Any] = {"metadata": meta}
        ak = os.getenv("IA_ACCESS_KEY") or self._access_key
        sk = os.getenv("IA_SECRET_KEY") or self._secret_key
        if isinstance(ak, str) and ak.strip():
            upload_kwargs["access_key"] = ak.strip()
        if isinstance(sk, str) and sk.strip():
            upload_kwargs["secret_key"] = sk.strip()

        # Use a friendly uploaded filename.
        upload_name = sanitize_filename(p.name)
        files = {upload_name: str(p)}

        try:
            resp: Any = upload_fn(identifier, files=files, **upload_kwargs)
        except TypeError:
            # Older versions may require positional args.
            resp = upload_fn(identifier, files, meta)
        except Exception as exc:
            log(f"[internetarchive] Upload error: {exc}", file=sys.stderr)
            raise

        # Drain generator responses to catch failures.
        try:
            if resp is not None:
                for r in resp:
                    if isinstance(r, dict) and r.get("success") is False:
                        raise Exception(str(r.get("error") or r))
        except Exception as exc:
            raise Exception(f"Internet Archive upload failed: {exc}")

        item_url = f"https://archive.org/details/{identifier}"

        try:
            if pipe_obj is not None:
                from Store import Store

                Store(self.config, suppress_debug=True).try_add_url_for_pipe_object(
                    pipe_obj, item_url
                )
        except Exception:
            pass

        return item_url