"""匹配系测试数据生成模块。

提供两种生成器：
  - generate_matching_data()  — 生成主/从匹配测试数据
  - generate_keybreak_data()  — 生成 KEY 切中断测试数据
"""

from __future__ import annotations

import random
from typing import Any


def generate_matching_data(
    matching_type: str = "1:1",
    record_count_r01: int = 10,
    record_count_r02: int = 10,
    key_match_ratio: float = 1.0,
) -> tuple[list[dict[str, Any]], list[dict[str, Any]]]:
    """生成匹配系测试数据。

    参数
    ----------
    matching_type : str
        匹配模式，支持:
          - "1:1"  主件每条在从件最多命中一条
          - "1:N"  主件每条在从件可能命中多条
          - "N:1"  从件每条在主件可能命中多条
    record_count_r01 : int
        主文件(R01)记录条数
    record_count_r02 : int
        从文件(R02)记录条数
    key_match_ratio : float
        键值匹配比例，0.0~1.0 之间。
        1.0 表示全部匹配，0.0 表示全部不匹配。

    返回
    -------
    tuple[list[dict], list[dict]]
        (主文件记录列表, 从文件记录列表)
    """
    if matching_type not in ("1:1", "1:N", "N:1"):
        raise ValueError(f"不支持的 matching_type：{matching_type!r}，应为 '1:1' / '1:N' / 'N:1'")
    if not 0.0 <= key_match_ratio <= 1.0:
        raise ValueError(f"key_match_ratio 必须在 0.0~1.0 之间，收到 {key_match_ratio}")
    if record_count_r01 < 0 or record_count_r02 < 0:
        raise ValueError("记录数不能为负数")

    main_records: list[dict[str, Any]] = []
    sub_records: list[dict[str, Any]] = []

    # 生成主文件记录
    for i in range(record_count_r01):
        main_records.append({
            "KEY": f"MAIN-{i:04d}",
            "DATA": f"main_data_{i}",
            "SEQ": i + 1,
        })

    # 生成从文件记录
    matched = 0
    unmatched = 0
    if matching_type == "1:1":
        # 1:1 — 最多让 record_count_r01 条从件匹配
        max_match = min(record_count_r01, record_count_r02)
        match_count = int(max_match * key_match_ratio)
        for i in range(record_count_r02):
            if i < match_count and i < record_count_r01:
                sub_records.append({
                    "KEY": f"MAIN-{i:04d}",
                    "DATA": f"sub_data_{i}",
                    "SEQ": i + 1,
                })
                matched += 1
            else:
                sub_records.append({
                    "KEY": f"UNMATCHED-SUB-{unmatched:04d}",
                    "DATA": f"sub_unmatched_{unmatched}",
                    "SEQ": record_count_r01 + unmatched + 1,
                })
                unmatched += 1

    elif matching_type == "1:N":
        # 1:N — 每条主件可能对应多条从件
        match_count = int(record_count_r01 * key_match_ratio)
        idx = 0
        for i in range(record_count_r01):
            if i < match_count:
                n_per_main = max(1, record_count_r02 // max(1, match_count))
                for _ in range(n_per_main):
                    if idx < record_count_r02:
                        sub_records.append({
                            "KEY": f"MAIN-{i:04d}",
                            "DATA": f"sub_data_{idx}",
                            "SEQ": idx + 1,
                        })
                        idx += 1
            else:
                if idx < record_count_r02:
                    sub_records.append({
                        "KEY": f"UNMATCHED-SUB-{unmatched:04d}",
                        "DATA": f"sub_unmatched_{unmatched}",
                        "SEQ": idx + 1,
                    })
                    idx += 1
                    unmatched += 1
        # 补齐剩余
        while idx < record_count_r02:
            sub_records.append({
                "KEY": f"UNMATCHED-SUB-{unmatched:04d}",
                "DATA": f"sub_unmatched_{unmatched}",
                "SEQ": idx + 1,
            })
            idx += 1
            unmatched += 1

    elif matching_type == "N:1":
        # N:1 — 多条主件对应同一条从件
        match_count = int(record_count_r02 * key_match_ratio)
        for i in range(record_count_r02):
            if i < match_count:
                sub_records.append({
                    "KEY": f"MAIN-{i % max(1, record_count_r01):04d}",
                    "DATA": f"sub_data_{i}",
                    "SEQ": i + 1,
                })
                matched += 1
            else:
                sub_records.append({
                    "KEY": f"UNMATCHED-SUB-{unmatched:04d}",
                    "DATA": f"sub_unmatched_{unmatched}",
                    "SEQ": i + 1,
                })
                unmatched += 1

    return main_records, sub_records


def generate_keybreak_data(
    group_count: int = 3,
    records_per_group: int = 2,
    sum_type: str = "accumulate",
) -> list[dict[str, Any]]:
    """生成 KEY 切测试数据，组间 KEY 值变化触发中断。

    每组内的记录 KEY 值相同；组间 KEY 值递增。
    适用于测试 AT END / BREAK / 集计功能。

    参数
    ----------
    group_count : int
        分组数量，默认 3。
    records_per_group : int
        每组记录数，默认 2。
    sum_type : str
        集计类型:
          - "accumulate"  累加型（FIELD 值递增）
          - "aggregate"   集计型（FIELD 值相同）
          - "mark"        标记型（FIELD 为固定标记值）

    返回
    -------
    list[dict]
        包含 KEY、FIELD、GROUP、SEQ 等字段的记录列表。
    """
    if group_count < 1:
        raise ValueError(f"group_count 必须 >= 1，收到 {group_count}")
    if records_per_group < 1:
        raise ValueError(f"records_per_group 必须 >= 1，收到 {records_per_group}")
    if sum_type not in ("accumulate", "aggregate", "mark"):
        raise ValueError(f"不支持的 sum_type：{sum_type!r}")

    records: list[dict[str, Any]] = []
    seq = 0

    for g in range(group_count):
        group_key = f"KEY-{chr(65 + g) if g < 26 else g}"  # KEY-A, KEY-B, ...
        for r in range(records_per_group):
            seq += 1
            if sum_type == "accumulate":
                field_val = (g + 1) * 100 + r + 1
            elif sum_type == "aggregate":
                field_val = (g + 1) * 100
            else:  # mark
                field_val = f"MARK-{chr(65 + g)}"

            records.append({
                "KEY": group_key,
                "FIELD": field_val,
                "GROUP": g + 1,
                "SEQ": seq,
            })

    return records