#!/usr/bin/env python3
"""Create a complete evaluation recipe for the published GroundingPI/GroundAnything suite.

Requires PyYAML from the release evaluation environment. Does not contact the model
service, change the template, overwrite existing recipes, or execute evaluation.
"""
from __future__ import annotations

import argparse
from datetime import datetime, timezone
import json
from pathlib import Path
import re
import shlex
import sys
import uuid

try:
    import yaml
except ImportError:
    raise SystemExit('PyYAML is required. Run with the release .venv-eval/bin/python, or install PyYAML.')


SUITE_COUNTS = {'groundingpi34': 34, 'groundanything30': 30}


def checkout_path(root, value, label):
    source = Path(value).expanduser()
    result = (source if source.is_absolute() else root / source).resolve()
    if not result.is_relative_to(root):
        raise ValueError(f'{label} must be inside the code checkout: {value}')
    return result


def create_recipe(code_root, template, data_root, suite, output, suites_file):
    code_root = Path(code_root).expanduser().resolve(strict=True)
    data_root = Path(data_root).expanduser().resolve(strict=True)
    if not data_root.is_dir():
        raise ValueError(f'Data root is not a directory: {data_root}')
    template = checkout_path(code_root, template, 'Template')
    output = checkout_path(code_root, output, 'Output')
    if output.exists():
        raise FileExistsError(f'Refusing to overwrite existing output: {output}')
    path_config = code_root / 'configs/datasets.local.yaml'
    if not path_config.is_file():
        raise FileNotFoundError(f'Missing {path_config}; run prepare_data.py with --code-root first.')
    local_paths = yaml.safe_load(path_config.read_text(encoding='utf-8'))
    if not isinstance(local_paths, dict) or not isinstance(local_paths.get('images'), str):
        raise ValueError(f'Missing images path in {path_config}; regenerate it with prepare_data.py.')
    configured_images = Path(local_paths['images']).expanduser()
    if not configured_images.is_absolute():
        configured_images = data_root / configured_images
    expected_images = (data_root / 'images').resolve()
    if configured_images.resolve() != expected_images:
        raise ValueError(
            f'Data root mismatch: {path_config} maps images to {configured_images.resolve()}, '
            f'but --data-root requires {expected_images}. '
            'Use the data root from prepare_data.py or regenerate the local path configuration.'
        )
    registry_file = code_root / 'configs/eval/tasks.json'
    registry = json.loads(registry_file.read_text(encoding='utf-8'))
    suites = json.loads(Path(suites_file).read_text(encoding='utf-8'))
    tasks = suites[suite]
    if not isinstance(tasks, list) or any(not isinstance(task, str) for task in tasks):
        raise ValueError(f'Invalid task list for suite: {suite}')
    if len(tasks) != SUITE_COUNTS[suite] or len(set(tasks)) != len(tasks):
        raise ValueError(f'{suite} requires exactly {SUITE_COUNTS[suite]} unique tasks')
    unknown = sorted(set(tasks) - set(registry))
    if unknown:
        raise ValueError(f'Tasks absent from checkout registry: {unknown}')
    config = yaml.safe_load(template.read_text(encoding='utf-8'))
    if not isinstance(config, dict):
        raise ValueError('Evaluation template must contain a YAML mapping')
    required = {'model_path', 'api_url', 'output_root'}
    if required - config.keys():
        raise ValueError(f'Incomplete evaluation template: missing {sorted(required - config.keys())}')
    stamp = datetime.now(timezone.utc).strftime('%Y%m%d_%H%M%S') + '_' + uuid.uuid4().hex[:10]
    template_label = re.sub(r'[^a-zA-Z0-9_-]', '_', template.stem)
    config.update(
        mode='GAM',
        tasks=tasks,
        data_root=str(data_root),
        datasets='configs/datasets.local.yaml',
        limit=None,
        run_id=f'{suite}_{template_label}_{stamp}',
    )
    output.parent.mkdir(parents=True, exist_ok=True)
    with output.open('x', encoding='utf-8') as handle:
        handle.write('# Generated from ' + str(template.relative_to(code_root)) + '; model/service settings retained.\n')
        yaml.safe_dump(config, handle, sort_keys=False, allow_unicode=True)
    return output, config


def main(argv=None):
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument('--code-root', type=Path, required=True, help='Published release checkout')
    parser.add_argument('--template', required=True, help='Template path relative to checkout, e.g. configs/eval/dlm.yaml')
    parser.add_argument('--data-root', type=Path, required=True, help='Extracted data directory used by prepare_data.py')
    parser.add_argument('--suite', choices=tuple(SUITE_COUNTS), required=True)
    parser.add_argument('--output', required=True, help='New recipe path inside checkout, e.g. configs/eval/full_denoise.yaml')
    args = parser.parse_args(argv)
    suites_file = Path(__file__).resolve().parents[1] / 'configs/suites.json'
    output, config = create_recipe(args.code_root, args.template, args.data_root, args.suite, args.output, suites_file)
    root = args.code_root.expanduser().resolve()
    relative = str(output.relative_to(root))
    print(f'Created {output}')
    print(f'Selected {len(config["tasks"])} tasks; run_id={config["run_id"]}')
    print('Review the model path, API URL/model ID, and service contract against your running service.')
    print('From the checkout directory, validate local inputs:')
    print('  .venv-eval/bin/python scripts/evaluate.py ' + shlex.quote(relative) + ' --dry-run')
    print('After validation, start evaluation:')
    print('  python3 run.py eval --config ' + shlex.quote(relative))
    return 0


if __name__ == '__main__':
    try:
        raise SystemExit(main())
    except (OSError, ValueError, KeyError, yaml.YAMLError) as exc:
        print(f'ERROR: {exc}', file=sys.stderr)
        raise SystemExit(2)