# -*- coding: utf-8 -*-
"""mode_procedure · MySQL 持久化（工序解构结果双写：本地文件 + 数据库）
================================================================================

读 .env 的 MYSQL_* 连接 MySQL（pymysql）。两张表，结构相同：
  agent_dsl —— Agent 工序解构结果（run_cyber，每版本一行）
  mode_dsl  —— 大模型工序解构结果（单次大模型直出，每版本一行）

设计原则（沿用 fixed_query_eval/db.py）：
- **失败不阻断**：写库 try/except 包，DB 挂了不影响本地文件（文件是主存储）。
- **保留历史**：(q, case_id, version) 每版本一行；同版本重跑先删本版本再插（幂等）。
- workflow.json 嵌套深（procedures→steps→io），整份存 LONGTEXT，不拆关系行。
建表：跑 `python db.py init`。
"""
import os
import json
import sys
from pathlib import Path
from datetime import datetime

PROJECT_ROOT = Path(__file__).resolve().parents[5]
sys.path.insert(0, str(PROJECT_ROOT))

from dotenv import load_dotenv
load_dotenv()

try:
    import pymysql
    from pymysql.cursors import DictCursor
except ImportError:
    pymysql = None

TABLES = ("agent_dsl", "mode_dsl")   # 白名单：表名不能用占位符，必须校验


def _enabled() -> bool:
    return pymysql is not None and bool(os.getenv("MYSQL_HOST"))


def _conn():
    return pymysql.connect(
        host=os.getenv("MYSQL_HOST"),
        port=int(os.getenv("MYSQL_PORT", 3306)),
        user=os.getenv("MYSQL_USER"),
        password=os.getenv("MYSQL_PASSWORD"),
        database=os.getenv("MYSQL_DATABASE"),
        charset="utf8mb4",
        cursorclass=DictCursor,
        autocommit=True,
        connect_timeout=10,
    )


# ── DDL ──────────────────────────────────────────────────────────────────────

def _ddl(table, comment):
    return f"""
CREATE TABLE IF NOT EXISTS {table} (
  id              BIGINT AUTO_INCREMENT PRIMARY KEY,
  q               VARCHAR(255)  NOT NULL COMMENT 'query 目录名（自由中文）',
  case_id         VARCHAR(128)  NOT NULL COMMENT 'platform_channelContentId',
  platform        VARCHAR(32)   NULL,
  post_title      VARCHAR(512)  NULL,
  source_link     VARCHAR(1024) NULL,
  model           VARCHAR(64)   NULL     COMMENT '提取模型',
  version         VARCHAR(16)   NULL     COMMENT 'v_MMDDHHMM（每次生成；保留历史多版本共存）',
  procedure_count INT           NULL     COMMENT '工序数',
  workflow_json   LONGTEXT      NULL     COMMENT '整份 workflow.json',
  source_json     LONGTEXT      NULL     COMMENT '_source.json（喂给模型的帖子源）',
  created_time    VARCHAR(64)   NULL,
  KEY idx_q_case_ver (q(128), case_id, version)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='{comment}';
"""


def init_tables():
    """建表（幂等）。"""
    if not _enabled():
        print("⚠️ MySQL 未启用（缺 pymysql 或 MYSQL_HOST），跳过建表")
        return False
    conn = _conn()
    try:
        with conn.cursor() as cur:
            cur.execute(_ddl("agent_dsl", "Agent 工序解构结果（每版本一行）"))
            cur.execute(_ddl("mode_dsl", "大模型工序解构结果（每版本一行）"))
        print("✅ 建表完成：agent_dsl, mode_dsl")
        return True
    finally:
        conn.close()


# ── 写入 ─────────────────────────────────────────────────────────────────────

def upsert_dsl(table, q, case_id, version, model, workflow, source=None,
               platform=None, post_title=None, source_link=None):
    """写入一帖某版本的工序解构结果。**保留历史**：只删本 (q,case_id,version) 旧行再插。
    table 必须是 'agent_dsl' / 'mode_dsl'。失败返回 0（不阻断本地文件）。"""
    if not _enabled():
        return 0
    if table not in TABLES:
        raise ValueError(f"非法表名: {table}")
    procs = (workflow or {}).get("procedures") or []
    try:
        conn = _conn()
        try:
            with conn.cursor() as cur:
                cur.execute(f"DELETE FROM {table} WHERE q=%s AND case_id=%s AND version=%s",
                            (q, case_id, version))
                cur.execute(f"""
                INSERT INTO {table}
                  (q, case_id, platform, post_title, source_link, model, version,
                   procedure_count, workflow_json, source_json, created_time)
                VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)
                """, (
                    q, case_id, platform, (post_title or "")[:500], source_link, model, version,
                    len(procs),
                    json.dumps(workflow, ensure_ascii=False) if workflow is not None else None,
                    json.dumps(source, ensure_ascii=False) if source is not None else None,
                    datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
                ))
            return 1
        finally:
            conn.close()
    except Exception as ex:
        print(f"⚠️ {table} 写库失败（不影响本地文件）：{ex}")
        return 0


# ── 读取 ─────────────────────────────────────────────────────────────────────

def fetch_versions(table, q, case_id):
    """列出某帖所有版本（DESC，最新在前）。返回 [{version, model, procedure_count, created_time}]。"""
    if not _enabled() or table not in TABLES:
        return []
    try:
        conn = _conn()
        try:
            with conn.cursor() as cur:
                cur.execute(f"""SELECT version, model, procedure_count, created_time
                                FROM {table} WHERE q=%s AND case_id=%s
                                ORDER BY version DESC""", (q, case_id))
                return list(cur.fetchall())
        finally:
            conn.close()
    except Exception as ex:
        print(f"⚠️ {table} 读版本失败：{ex}")
        return []


def fetch_dsl(table, q, case_id, version=None):
    """取某帖某版本的 workflow（version=None 取最新）。返回 dict 或 None。"""
    if not _enabled() or table not in TABLES:
        return None
    try:
        conn = _conn()
        try:
            with conn.cursor() as cur:
                if version:
                    cur.execute(f"SELECT * FROM {table} WHERE q=%s AND case_id=%s AND version=%s",
                                (q, case_id, version))
                else:
                    cur.execute(f"""SELECT * FROM {table} WHERE q=%s AND case_id=%s
                                    ORDER BY version DESC LIMIT 1""", (q, case_id))
                row = cur.fetchone()
                if row and row.get("workflow_json"):
                    row["workflow"] = _loads(row["workflow_json"])
                return row
        finally:
            conn.close()
    except Exception as ex:
        print(f"⚠️ {table} 读取失败：{ex}")
        return None


def _loads(v, default=None):
    if v is None:
        return default
    if isinstance(v, (list, dict)):
        return v
    try:
        return json.loads(v)
    except Exception:
        return default


if __name__ == "__main__":
    cmd = sys.argv[1] if len(sys.argv) > 1 else "init"
    if cmd == "init":
        init_tables()
    else:
        print(f"用法: python db.py init")