"""Dry-run configuration: token-resolvable build-config first; failures fall back to sample with GAP."""
import os
from pathlib import Path
from src.build_config_client import build_config, BuildConfigError
from src.task_add_client import resolve_token

SOURCE = 'POST /api/adapt/task/build-config (discovered via capture); fallback templates/config_params.sample.yaml'
GAP = 'GAP: build-config API discovered via capture; sample is dry-run draft only, NOT production-ready. API foothold evidence: GAP (not wired).'
GPU_ENUMS = {
    '壁砺': 'Biren_166m', '壁砺166M': 'Biren_166m', 'Biren_166m': 'Biren_166m',
    '曦望': 'Sunrise_pt-200-x1', '曦望 S2': 'Sunrise_pt-200-x1',
    'Sunrise_pt-200-x1': 'Sunrise_pt-200-x1',
    '天垓100': 'Iluvatar_bi-100', 'Iluvatar_bi-100': 'Iluvatar_bi-100',
    '天垓150': 'Iluvatar_bi-150', 'Iluvatar_bi-150': 'Iluvatar_bi-150',
    '智铠': 'Iluvatar_mrv-100', '智铠100': 'Iluvatar_mrv-100',
    '智铠 mrv-100': 'Iluvatar_mrv-100', 'Iluvatar_mrv-100': 'Iluvatar_mrv-100',
    'MTT S4000': 'Mthreads_s4000', '摩尔线程': 'Mthreads_s4000', 'Mthreads_s4000': 'Mthreads_s4000',
}


def config_params_source():
    """Requested source preference for dry-run.

    - CONFIG_PARAMS_SOURCE=sample → force offline sample
    - CONFIG_PARAMS_SOURCE=build-config → force API path (with soft fallback in with_meta)
    - default (empty): prefer build-config when resolve_token() succeeds; else sample
    - ALLOW_BUILD_CONFIG=1 remains a legacy opt-in synonym when source empty and token ok
    """
    source = os.environ.get('CONFIG_PARAMS_SOURCE', '').strip()
    if source not in ('', 'sample', 'build-config'):
        raise BuildConfigError('unsupported CONFIG_PARAMS_SOURCE')
    if source:
        return source
    try:
        resolve_token()
    except (ValueError, OSError):
        return 'sample'
    # Token resolvable → prefer build-config (kickoff select-opt default).
    return 'build-config'


def build_config_params_with_meta(gpu_type=None, framework='vllm', task_type='text-generation'):
    """Return (YAML, metadata); API failures explicitly fall back for dry-run.

    scripts/build_config_dry.py calls build_config directly and remains strict.
    """
    source = config_params_source()
    meta = {'configParams_source': 'sample'}
    try:
        resolve_token()
    except (ValueError, OSError):
        meta['auth'] = 'missing'
    else:
        meta['auth'] = 'ok'
    gpu_enum = GPU_ENUMS.get(gpu_type)
    if source == 'build-config' and gpu_enum is None:
        meta['configParams_fallback_reason'] = 'GAP: gpu enum unmapped'
    elif source == 'build-config':
        try:
            yaml = build_config(gpu_enum, framework, task_type)
        except BuildConfigError as error:
            meta['configParams_fallback_reason'] = 'GAP: ' + error.error_attribution
        else:
            meta['configParams_source'] = 'build-config'
            return yaml, meta
    return (Path(__file__).resolve().parents[1] / 'templates/config_params.sample.yaml').read_text(), meta


def build_config_params(gpu_type=None, framework='vllm', task_type='text-generation'):
    """Compatible YAML-only dry-run wrapper, including explicit fallback."""
    return build_config_params_with_meta(gpu_type, framework, task_type)[0]