"""The dictation chain: transcribe → clean up → clipboard → paste.

The same chain also carries the other thing a dictation can be. Asked to, it
hands the transcript to Claude Code instead of pasting it, and pastes back
whatever came of it: an answer to a question, or a sentence saying what was
done.
"""

import os
import shutil
import sys
import threading
import time
import traceback

from PyQt6.QtCore import QObject, pyqtSignal

import api
import assistant
import audio
import config as cfg
import i18n
import paste
import vad
from i18n import t

CHUNK_SECONDS = audio.CHUNK_FRAMES / audio.RATE


class Pipeline(QObject):
    stage = pyqtSignal(str)          # human-readable progress line
    finished = pyqtSignal(str, str, str)  # raw transcript, final text, warning
    failed = pyqtSignal(str)
    cancelled = pyqtSignal()

    def __init__(self, conf, parent=None):
        super().__init__(parent)
        self.conf = conf
        self._thread = None
        self._stop = threading.Event()

    @property
    def busy(self):
        return self._thread is not None and self._thread.is_alive()

    def run(self, wav_path, duration, rms_values=(), ask=False):
        if self.busy:
            return
        self._stop.clear()
        self._thread = threading.Thread(
            target=self._work, args=(wav_path, duration, list(rms_values), ask),
            daemon=True,
        )
        self._thread.start()

    def cancel(self):
        """Give up on a job already under way.

        Only the Claude call can honour this, and it is the only one long enough
        to be worth interrupting: a transcription is over in seconds, a command
        that went looking through the web is not.
        """
        self._stop.set()

    def _work(self, wav_path, duration, rms_values, ask):
        conf = self.conf
        started = time.monotonic()
        raw = ""

        # Room tone only: don't spend an API call, and don't invite a
        # hallucinated sentence back.
        if conf["skip_silent"]:
            stats = vad.analyse(rms_values, CHUNK_SECONDS, conf["speech_margin_db"])
            if vad.is_silent(stats, conf["silence_db"], conf["speech_margin_db"],
                             conf["min_voiced_seconds"]):
                self._discard(wav_path)
                self.failed.emit(
                    t("No speech detected ({level} dB)", level=round(stats["speech_db"]))
                )
                return

        try:
            self.stage.emit(t("Transcribing…"))
            target = conf.transcribe_target()
            raw = api.transcribe(
                target,
                wav_path,
                language=conf["language"],
                prompt=conf["transcribe_prompt"],
            )

            if conf["filter_hallucinations"] and vad.looks_like_hallucination(raw, duration):
                self._discard(wav_path)
                self.failed.emit(t("Discarded a stock phrase: “{text}”", text=raw[:60]))
                return

            text = raw
            warning = ""
            # Claude reads through “eee” and “hani” without help, so a dictation
            # on its way there is normally sent as it was heard, one API call and
            # a second or two lighter.
            if (conf["assistant_cleanup"] if ask else conf["cleanup_enabled"]):
                self.stage.emit(t("Cleaning up…"))
                try:
                    text = api.cleanup(
                        raw,
                        conf.openrouter_key(),
                        conf["cleanup_model"],
                        conf.cleanup_prompt(),
                        reasoning=conf["cleanup_reasoning"],
                        base_url=conf["openrouter_base_url"],
                    )
                except api.ApiError as exc:
                    # Keep the transcript, but never let the failure pass unseen:
                    # a rejected key would otherwise look like working dictation.
                    text = raw
                    warning = str(exc)
                    print(f"dikte: cleanup failed: {exc}", file=sys.stderr)

            question = ""
            if ask:
                question = text
                self.stage.emit(t("Asking {name}…", name=i18n.name(
                    assistant.display_name(conf), "dative")))
                text, denied = assistant.ask(
                    question, conf,
                    on_stage=self.stage.emit,
                    should_stop=self._stop.is_set,
                )
                warning = "\n".join(x for x in (warning, denied) if x)

            previous = paste.read_clipboard() if conf["restore_clipboard"] else None
            paste.copy(text)

            if (conf["assistant_paste"] if ask else conf["auto_paste"]):
                self.stage.emit(t("Pasting…"))
                paste.press(conf["paste_shortcut"])
                if previous is not None:
                    time.sleep(0.35)
                    paste.copy_bytes(previous)

            cfg.append_history({
                "ts": time.strftime("%Y-%m-%d %H:%M:%S"),
                "duration": round(duration, 1),
                "elapsed": round(time.monotonic() - started, 1),
                "model": target.model,
                "cleanup_model": conf["cleanup_model"] if conf["cleanup_enabled"] else "",
                "cleanup_error": warning,
                "mode": "ask" if ask else "",
                "question": question,
                "assistant_model": conf["assistant_model"] if ask else "",
                "raw": raw,
                "text": text,
            })
            try:
                cfg.trim_history(conf["history_limit"])
            except OSError as exc:
                print(f"dikte: could not trim the history: {exc}", file=sys.stderr)
            self.finished.emit(raw, text, warning)

        except assistant.Cancelled:
            self.cancelled.emit()
        except (api.ApiError, paste.PasteError, assistant.AssistantError) as exc:
            print(f"dikte: {exc}", file=sys.stderr)
            self.failed.emit(str(exc))
        except Exception as exc:  # never fail silently
            traceback.print_exc()
            self.failed.emit(t("Unexpected error: {error}", error=exc))
        finally:
            self._discard(wav_path)

    def _discard(self, wav_path):
        if not os.path.exists(wav_path):
            return
        if self.conf["keep_audio"]:
            try:
                cfg.RECORDINGS_DIR.mkdir(parents=True, exist_ok=True)
                shutil.move(wav_path, cfg.RECORDINGS_DIR / (time.strftime("%Y%m%d-%H%M%S") + ".wav"))
                return
            except OSError:
                pass
        try:
            os.unlink(wav_path)
        except OSError:
            pass