"""Runtime settings, read once from environment variables.

Every limit can be changed without touching code, e.g. in the Space's
"Variables and secrets" page.
"""

from __future__ import annotations

import os


def _int(name: str, default: int) -> int:
    try:
        return int(os.environ.get(name, default))
    except (TypeError, ValueError):
        return default


def _list(name: str, default: list[str]) -> list[str]:
    raw = os.environ.get(name, "")
    items = [x.strip() for x in raw.replace("\n", ",").split(",") if x.strip()]
    return items or list(default)


# --- Gemini -----------------------------------------------------------------
# Models are tried in order; a 404 / "not available" moves on to the next one.
# GEMINI_MODEL may hold a single name or a comma-separated list.
AUDIO_MODELS = _list(
    "GEMINI_MODEL",
    ["gemini-3.8-flash", "gemini-flash-latest", "gemini-3.5-flash", "gemini-2.5-flash"],
)
# Used for the text-only reasoning steps when the user picks "Deep".
DEEP_MODELS = _list(
    "GEMINI_DEEP_MODEL",
    ["gemini-pro-latest", "gemini-3.1-pro-preview", "gemini-2.5-pro"],
)
REQUEST_TIMEOUT_S = _int("GEMINI_TIMEOUT_S", 600)
MAX_RETRIES = _int("GEMINI_MAX_RETRIES", 4)
# Files processed at the same time (Gemini calls run in threads).
PARALLEL_FILES = max(1, _int("PARALLEL_FILES", 3))

# --- Audio ------------------------------------------------------------------
ANALYSIS_SR = 16_000            # Gemini hears audio at 16 kHz; features use the same rate
CHUNK_TARGET_S = _int("CHUNK_SECONDS", 600)   # transcription chunk length (~10 min)
CHUNK_SLACK_S = 60              # cut at the longest pause within +/- this window
OPUS_BITRATE = 32_000
MAX_FILES = _int("MAX_FILES", 20)
MAX_MINUTES_PER_FILE = _int("MAX_MINUTES_PER_FILE", 180)
MAX_TOTAL_MINUTES = _int("MAX_TOTAL_MINUTES", 600)
MAX_UPLOAD_MB = _int("MAX_UPLOAD_MB", 500)

AUDIO_EXTENSIONS = [
    ".wav", ".mp3", ".m4a", ".aac", ".flac", ".ogg", ".oga", ".opus", ".wma",
    ".aif", ".aiff", ".amr", ".webm", ".mp4", ".mov", ".mkv", ".3gp", ".caf",
]


def api_keys(extra: str | None = None) -> list[str]:
    """All configured Gemini keys, de-duplicated, user-supplied key first.

    Sources: the optional key typed in the UI, GEMINI_API_KEYS (comma or
    newline separated, for rotating between several keys when one hits its
    quota), GEMINI_API_KEY and GOOGLE_API_KEY.
    """
    keys: list[str] = []
    candidates = [extra or ""]
    candidates += os.environ.get("GEMINI_API_KEYS", "").replace("\n", ",").split(",")
    candidates += [os.environ.get("GEMINI_API_KEY", ""), os.environ.get("GOOGLE_API_KEY", "")]
    for k in candidates:
        k = k.strip().strip('"').strip("'")
        if k and k not in keys:
            keys.append(k)
    return keys