"""输出层：JSON输出（按文件分组入出力 + 工作存储区分）"""

import json
from pathlib import Path


_INVERSE_OP = {'>': '<=', '<': '>=', '=': '<>', '>=': '<', '<=': '>'}


def _scenario_text(path_cons):
    parts = []
    for c in path_cons:
        if len(c) != 4:
            continue
        field, op, val, want = c
        if op == 'not_in':
            desc = f"{field} not in {val}" if want else f"{field} in {val}"
        elif not want:
            desc = f"{field} {_INVERSE_OP.get(op, '?' + op)} {val}"
        else:
            desc = f"{field} {op} {val}"
        parts.append(desc)
    return ', '.join(parts)


def output_json(records, outpath, roles=None, fd_fields=None, field_to_fd=None,
                open_dir=None, path_cons_list=None):
    outpath.parent.mkdir(parents=True, exist_ok=True)
    if not roles:
        with open(outpath, 'w', encoding='utf-8') as f:
            json.dump(records, f, ensure_ascii=False, indent=2)
        return

    # FD direction lookup
    out = []
    for i, rec in enumerate(records):
        inp = {}
        out_exp = {}
        ws = {}

        # Group by FD
        if fd_fields and field_to_fd:
            for fd_name, fds_set in fd_fields.items():
                direction = (open_dir or {}).get(fd_name, '')
                inp_block = {}
                out_block = {}
                for fname in fds_set:
                    if fname not in rec:
                        continue
                    r = roles.get(fname, 'unused')
                    val = rec[fname]
                    if direction in ('INPUT', 'I-O') and r in ('input', 'inout'):
                        inp_block[fname] = val
                    if direction in ('OUTPUT', 'I-O') and r in ('output', 'inout'):
                        out_block[fname] = val
                if inp_block:
                    inp[fd_name] = inp_block
                if out_block:
                    out_exp[fd_name] = out_block

        # Working-storage: not belonging to any FD
        for name, val in rec.items():
            if not field_to_fd or name not in field_to_fd:
                ws[name] = val

        entry = {
            'input': inp,
            'expected_output': out_exp,
            'working_storage': ws,
        }

        if path_cons_list and i < len(path_cons_list):
            text = _scenario_text(path_cons_list[i])
            if text:
                entry['scenario'] = text

        out.append(entry)

    with open(outpath, 'w', encoding='utf-8') as f:
        json.dump(out, f, ensure_ascii=False, indent=2)


def output_input_files(records, outdir, stem, roles, fd_fields, field_to_fd, open_dir):
    """按 FD 名拆分出力入力 JSON 文件。
    每个 INPUT / I-O 方向 FD 生成一个文件：{stem}_{fd_name}.json
    内容为路径数 × 记录，每条只含该 FD 的入力字段值。
    """
    input_fds = {}
    for fd_name, fds_set in fd_fields.items():
        direction = (open_dir or {}).get(fd_name, '')
        if direction not in ('INPUT', 'I-O'):
            continue
        has_input = any(roles.get(fname, 'unused') in ('input', 'inout') for fname in fds_set)
        if not has_input:
            continue
        input_fds[fd_name] = fds_set

    if not input_fds:
        return

    outdir.mkdir(parents=True, exist_ok=True)

    for fd_name, fds_set in input_fds.items():
        fd_records = []
        direction = (open_dir or {}).get(fd_name, '')
        for rec in records:
            fd_rec = {}
            for fname in fds_set:
                r = roles.get(fname, 'unused')
                if direction in ('INPUT', 'I-O') and r in ('input', 'inout'):
                    if fname in rec:
                        fd_rec[fname] = rec[fname]
            if fd_rec:
                fd_records.append(fd_rec)

        outpath = outdir / f'{stem}_{fd_name}.json'
        with open(outpath, 'w', encoding='utf-8') as f:
            json.dump(fd_records, f, ensure_ascii=False, indent=2)