from __future__ import annotations

from pathlib import Path
from typing import Any, Dict, Optional, Sequence
import sys

from SYS.logger import log

import pipeline as ctx
from . import _shared as sh

Cmdlet = sh.Cmdlet
CmdletArg = sh.CmdletArg
SharedArgs = sh.SharedArgs
normalize_hash = sh.normalize_hash
parse_cmdlet_args = sh.parse_cmdlet_args
normalize_result_input = sh.normalize_result_input
should_show_help = sh.should_show_help
from Store import Store
from SYS.utils import sha256_file


class Get_Note(Cmdlet):
    def __init__(self) -> None:
        super().__init__(
            name="get-note",
            summary="List notes on a file in a store.",
            usage="get-note -store <store> [-query \"hash:<sha256>\"]",
            alias=["get-notes", "get_note"],
            arg=[
                SharedArgs.STORE,
                SharedArgs.QUERY,
            ],
            detail=[
                "- Notes are retrieved via the selected store backend.",
                "- Lyrics are stored in a note named 'lyric'.",
            ],
            exec=self.run,
        )
        try:
            SharedArgs.STORE.choices = SharedArgs.get_store_choices(None)
        except Exception:
            pass
        self.register()

    def _resolve_hash(self, raw_hash: Optional[str], raw_path: Optional[str], override_hash: Optional[str]) -> Optional[str]:
        resolved = normalize_hash(override_hash) if override_hash else normalize_hash(raw_hash)
        if resolved:
            return resolved
        if raw_path:
            try:
                p = Path(str(raw_path))
                stem = p.stem
                if len(stem) == 64 and all(c in "0123456789abcdef" for c in stem.lower()):
                    return stem.lower()
                if p.exists() and p.is_file():
                    return sha256_file(p)
            except Exception:
                return None
        return None

    def run(self, result: Any, args: Sequence[str], config: Dict[str, Any]) -> int:
        if should_show_help(args):
            log(f"Cmdlet: {self.name}\nSummary: {self.summary}\nUsage: {self.usage}")
            return 0

        parsed = parse_cmdlet_args(args, self)
        store_override = parsed.get("store")
        query_hash = sh.parse_single_hash_query(parsed.get("query"))
        if parsed.get("query") and not query_hash:
            log("[get_note] Error: -query must be of the form hash:<sha256>", file=sys.stderr)
            return 1

        results = normalize_result_input(result)
        if not results:
            if store_override and query_hash:
                results = [{"store": str(store_override), "hash": query_hash}]
            else:
                log("[get_note] Error: Requires piped item(s) or -store and -query \"hash:<sha256>\"", file=sys.stderr)
                return 1

        store_registry = Store(config)
        any_notes = False

        for res in results:
            if not isinstance(res, dict):
                continue

            store_name = str(store_override or res.get("store") or "").strip()
            raw_hash = res.get("hash")
            raw_path = res.get("path")

            if not store_name:
                log("[get_note] Error: Missing -store and item has no store field", file=sys.stderr)
                return 1

            resolved_hash = self._resolve_hash(
                raw_hash=str(raw_hash) if raw_hash else None,
                raw_path=str(raw_path) if raw_path else None,
                override_hash=str(query_hash) if query_hash else None,
            )
            if not resolved_hash:
                continue

            try:
                backend = store_registry[store_name]
            except Exception as exc:
                log(f"[get_note] Error: Unknown store '{store_name}': {exc}", file=sys.stderr)
                return 1

            notes = {}
            try:
                notes = backend.get_note(resolved_hash, config=config) or {}
            except Exception:
                notes = {}

            if not notes:
                continue

            any_notes = True
            # Emit each note as its own row so CLI renders a proper note table
            for k in sorted(notes.keys(), key=lambda x: str(x).lower()):
                v = notes.get(k)
                raw_text = str(v or "")
                # Keep payload small for IPC/pipes.
                raw_text = raw_text[:999]
                preview = " ".join(raw_text.replace("\r", "").split("\n"))
                ctx.emit(
                    {
                        "store": store_name,
                        "hash": resolved_hash,
                        "note_name": str(k),
                        "note_text": raw_text,
                        "columns": [
                            ("Name", str(k)),
                            ("Text", preview.strip()),
                        ],
                    }
                )

        if not any_notes:
            ctx.emit("No notes found.")
        return 0


CMDLET = Get_Note()