"""Central configuration for the Qt5→Qt6 migration pipeline."""

from __future__ import annotations

import os
from pathlib import Path

from dotenv import load_dotenv

_DOTENV_LOADED = False


def _get_env(name: str) -> str:
    """Read env var from runtime first, then .env as fallback."""
    value = os.getenv(name, "")
    if value:
        return value
    global _DOTENV_LOADED
    if not _DOTENV_LOADED:
        load_dotenv(dotenv_path=Path.cwd() / ".env", override=False)
        load_dotenv(override=False)
        _DOTENV_LOADED = True
    return os.getenv(name, "")


def _require_env(name: str) -> str:
    value = _get_env(name)
    if not value:
        raise RuntimeError(
            f"Missing required environment variable: {name}. "
            "Set runtime env vars or provide them via .env."
        )
    return value

# ---------------------------------------------------------------------------
# Scaleway API
# ---------------------------------------------------------------------------
# Runtime credentials/config (must exist in runtime env or .env).
SCW_ACCESS_KEY: str = _require_env("SCW_ACCESS_KEY")
SCW_SECRET_KEY: str = _require_env("SCW_SECRET_KEY")
SCW_DEFAULT_ORGANIZATION_ID: str = _require_env("SCW_DEFAULT_ORGANIZATION_ID")
SCW_DEFAULT_PROJECT_ID: str = _require_env("SCW_DEFAULT_PROJECT_ID")
SCW_SERVERLESS: str = _require_env("SCW_SERVERLESS")

API_KEY: str = SCW_SECRET_KEY
BASE_URL: str = f"https://api.scaleway.ai/{SCW_SERVERLESS}/v1/chat/completions"
API_TIMEOUT: float = 120.0          # seconds per HTTP request
API_MAX_TOKENS: int = 8192

# Model selection profile (CLI-selectable)
MODEL_GLM: str = "glm-5.2"
MODEL_QWEN: str = "qwen3.5-397b-a17b"
DEFAULT_MODEL_FAMILY: str = "glm"
LARGE_FILE_THRESHOLD: int = 1_000

# ---------------------------------------------------------------------------
# Concurrency
# ---------------------------------------------------------------------------
MAX_CONCURRENT_TASKS: int = 3   # parallel file workers per track

# ---------------------------------------------------------------------------
# Chunking
# ---------------------------------------------------------------------------
CHUNK_SIZE_LINES: int = 500     # max lines per chunk when splitting large files

# ---------------------------------------------------------------------------
# Time budgets  (seconds)
# Soft budget  → warning logged, migration continues
# Hard budget  → file goes to quarantine immediately
# ---------------------------------------------------------------------------
SOFT_BUDGET_PER_FILE: float = 10 * 60          # 10 min
HARD_BUDGET_SMALL_FILE: float = 10 * 60        # 10 min  (≤ LARGE_FILE_THRESHOLD lines)
HARD_BUDGET_LARGE_FILE: float = 25 * 60        # 25 min  (> LARGE_FILE_THRESHOLD lines)

# ---------------------------------------------------------------------------
# Retry / quality
# ---------------------------------------------------------------------------
MAX_RETRIES: int = 3    # per file, per track

# Warnings: collected and reported but do NOT block quality gates.
# Set to True only if you want -Werror behaviour (future option).
WARNINGS_ARE_BLOCKING: bool = False

# ---------------------------------------------------------------------------
# Paths
# ---------------------------------------------------------------------------
WORKSPACE_ROOT: Path = Path("workspace")      # git worktrees live here
QUARANTINE_DIR: Path = Path("quarantine")     # quarantine JSON + MD tickets
REPORTS_DIR: Path = Path("reports")           # batch comparison reports
TESTS_DIR_NAME: str = "tests_generated"       # relative to each worktree root

# ---------------------------------------------------------------------------
# Track identifiers
# ---------------------------------------------------------------------------
TRACK_A_ID: str = "track_a_conservative"
TRACK_B_ID: str = "track_b_modern"