import argparse
import csv
import json
import os
import re


TCGA_ID_RE = re.compile(r"(TCGA-[A-Z0-9]{2}-[A-Z0-9]+)")


def extract_case_id(name):
    m = TCGA_ID_RE.search(name)
    return m.group(1) if m else None


def read_cases_from_split(path):
    cases = set()
    with open(path, newline='') as f:
        reader = csv.DictReader(f)
        for r in reader:
            for key in ('train', 'val', 'test'):
                item = (r.get(key) or '').strip()
                if not item:
                    continue
                cid = extract_case_id(item)
                if cid:
                    cases.add(cid)
    return cases


def list_input_csvs(input_dir, output_path):
    files = []
    for n in os.listdir(input_dir):
        if n.startswith('.'):
            continue
        if not n.startswith('splits_') or not n.endswith('.csv'):
            continue
        if 'MERGED' in n.upper():
            continue
        files.append(os.path.join(input_dir, n))
    files = sorted(files)
    if output_path:
        out_abs = os.path.abspath(output_path)
        files = [p for p in files if os.path.abspath(p) != out_abs]
    return files


def choose_default_inputs(input_dir):
    return list_input_csvs(input_dir, None)


def build_case_label_map(inputs):
    case_to_label = {}
    conflicts = []
    for label, path in enumerate(inputs):
        cases = read_cases_from_split(path)
        for cid in cases:
            if cid in case_to_label and case_to_label[cid] != label:
                conflicts.append((cid, case_to_label[cid], label, path))
                continue
            case_to_label[cid] = label
    return case_to_label, conflicts


def write_labels_csv(case_to_label, merged_cases, output_path):
    missing = []
    rows = []
    for cid in sorted(merged_cases):
        if cid not in case_to_label:
            missing.append(cid)
            continue
        rows.append((cid, case_to_label[cid]))
    with open(output_path, 'w', newline='') as f:
        writer = csv.writer(f)
        writer.writerow(['case_id', 'label'])
        for cid, label in rows:
            writer.writerow([cid, label])
    return rows, missing


def write_mapping(mapping_rows, mapping_output):
    if not mapping_output:
        return
    if mapping_output.lower().endswith('.json'):
        with open(mapping_output, 'w', encoding='utf-8') as f:
            json.dump(mapping_rows, f, ensure_ascii=True, indent=2)
        return
    with open(mapping_output, 'w', newline='') as f:
        writer = csv.writer(f)
        writer.writerow(['label', 'source_name', 'source_csv'])
        for row in mapping_rows:
            writer.writerow([row['label'], row['source_name'], row['source_csv']])


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('--input_dir', default='/mnt/datadisk0/data_process')
    parser.add_argument('--inputs', nargs='*', default=None)
    parser.add_argument('--merged', default='/mnt/datadisk0/data_process/splits_ALL_MERGED.csv')
    parser.add_argument('--output', default='/mnt/datadisk0/data_process/splits_5MERGED_labels.csv')
    parser.add_argument('--mapping_output', default=None)
    args = parser.parse_args()

    if args.inputs:
        inputs = args.inputs
    else:
        inputs = choose_default_inputs(args.input_dir)

    mapping_rows = []
    for label, path in enumerate(inputs):
        base_name = os.path.basename(path)
        source_name = os.path.splitext(base_name)[0].replace('splits_', '')
        mapping_rows.append({'label': label, 'source_name': source_name, 'source_csv': path})

    if args.mapping_output is None:
        base_out = os.path.splitext(args.output)[0]
        args.mapping_output = base_out + '_map.csv'

    merged_cases = read_cases_from_split(args.merged)
    case_to_label, conflicts = build_case_label_map(inputs)
    rows, missing = write_labels_csv(case_to_label, merged_cases, args.output)
    write_mapping(mapping_rows, args.mapping_output)

    print('Input CSVs:', len(inputs))
    print('Merged file:', args.merged)
    print('Merged cases:', len(merged_cases))
    print('Labeled cases:', len(rows))
    print('Output CSV:', args.output)
    print('Mapping output:', args.mapping_output)
    print('Label mapping:')
    for row in mapping_rows:
        print(f"  {row['label']} -> {row['source_name']} ({row['source_csv']})")
    if missing:
        print('Missing labels for cases:', len(missing))
        for cid in missing[:20]:
            print('  ', cid)
        if len(missing) > 20:
            print('  ... and', len(missing) - 20, 'more')
    if conflicts:
        print('Conflicting labels:', len(conflicts))
        for cid, old_label, new_label, path in conflicts[:20]:
            print('  ', cid, 'existing=', old_label, 'new=', new_label, 'from', path)
        if len(conflicts) > 20:
            print('  ... and', len(conflicts) - 20, 'more')


if __name__ == '__main__':
    main()