"""迭代能力 — sd_iterations 的状态机语义化迁移（通用、产线无关）。

定位：迭代 CRUD 走 xls2ui 生成的端点；本模块只做「生命周期状态流转」——
每个迁移 CAS 原子（防并发/越权）+ 租户隔离 + 审计。

迭代的生命周期/流转规则在 iteration skill 里（LLM 读 skill 判断合法性）；本模块只固化操作原语。

角色规范：role 参数用 agent.{role}（无前缀自动补 agent.）；人角色用 {orgtype}.{role}。

scope 约定：sd_iterations 用 project_id 做范围校验（CAS 的 WHERE 里带 project_id），
与 pipeline_tasks 用 tenant_id 不同——sd_* 业务表用自己的归属列。
"""

import logging
from sqlor.dbpools import DBPools
from appPublic.uniqueID import getID
from .audit import record_audit

DBNAME = "pipeline"
logger = logging.getLogger("pipeline.iteration_capability")

TABLE = "sd_iterations"

# 迭代状态（SDLC 默认，状态机语义见 iteration skill）
S_PLANNING = "planning"          # 规划中
S_IN_PROGRESS = "in_progress"    # 进行中
S_COMPLETED = "completed"        # 已完成
S_CANCELLED = "cancelled"        # 已取消


def _get_db():
    db = DBPools()
    if not db.databases:
        from appPublic.jsonConfig import getConfig
        config = getConfig()
        if config.databases:
            db.databases = config.databases
    return db, DBNAME


def _normalize_role(role):
    """角色规范：agent 角色补 agent. 前缀；人角色 {orgtype}.{role} 保留原样。"""
    role = (role or "").strip()
    if not role:
        return ""
    if "." in role:
        return role
    return f"agent.{role}"


async def _transition(iteration_id, project_id, from_state, to_state, action,
                      who=None, agent_id=None, detail=None):
    """CAS 状态迁移 + 审计。返回 (ok, message)。"""
    if not iteration_id or not project_id:
        return False, "缺少 iteration_id 或 project_id"
    db, dbname = _get_db()
    async with db.sqlorContext(dbname) as sor:
        await sor.sqlExe(
            f"UPDATE {TABLE} SET status=${{to}}$, updated_at=NOW() "
            "WHERE id=${iid}$ AND project_id=${pid}$ AND status=${from}$",
            {"to": to_state, "iid": iteration_id, "pid": project_id, "from": from_state})
        recs = await sor.R(TABLE, {'id': iteration_id})
        await sor.sqlExe("COMMIT", {})
        if not recs:
            return False, "迭代不存在"
        cur = getattr(recs[0], 'status', '')
        if cur != to_state:
            return False, f"状态迁移失败(CAS): 期望 from={from_state} 实际 status={cur}"
        await record_audit(project_id, TABLE, iteration_id, action,
                           from_state=from_state, to_state=to_state,
                           who=who, agent_id=agent_id, detail=detail, sor=sor)
        return True, to_state


async def create_iteration(project_id, iteration_name, iteration_type="new_feature",
                           scope="", priority=5, created_by="", who=None, agent_id=None):
    """创建迭代：新建记录，status=planning。返回 (ok, iteration_id_or_message)。"""
    if not project_id:
        return False, "缺少 project_id"
    if not iteration_name or not iteration_name.strip():
        return False, "缺少 iteration_name"
    db, dbname = _get_db()
    async with db.sqlorContext(dbname) as sor:
        iid = getID()
        try:
            priority = int(priority)
        except (TypeError, ValueError):
            priority = 5
        await sor.C(TABLE, {
            'id': iid,
            'project_id': project_id,
            'iteration_name': iteration_name.strip(),
            'iteration_type': iteration_type or 'new_feature',
            'scope': scope or '',
            'status': S_PLANNING,
            'priority': priority,
            'created_by': created_by or '',
        })
        await record_audit(project_id, TABLE, iid, 'create',
                           to_state=S_PLANNING, who=_normalize_role(who),
                           agent_id=agent_id, sor=sor)
        logger.info("create_iteration: %s project=%s", iid, project_id)
        return True, iid


async def start_iteration(iteration_id, project_id, who=None, agent_id=None):
    """开始迭代：planning → in_progress。"""
    return await _transition(iteration_id, project_id, S_PLANNING, S_IN_PROGRESS, 'start',
                             who=who, agent_id=agent_id)


async def complete_iteration(iteration_id, project_id, who=None, agent_id=None):
    """完成迭代：in_progress → completed。"""
    return await _transition(iteration_id, project_id, S_IN_PROGRESS, S_COMPLETED, 'complete',
                             who=who, agent_id=agent_id)


async def cancel_iteration(iteration_id, project_id, who=None, agent_id=None, comment=None):
    """取消迭代：planning/in_progress → cancelled。"""
    ok, msg = await _transition(iteration_id, project_id, S_PLANNING, S_CANCELLED, 'cancel',
                                who=who, agent_id=agent_id, detail=comment)
    if ok:
        return ok, msg
    return await _transition(iteration_id, project_id, S_IN_PROGRESS, S_CANCELLED, 'cancel',
                             who=who, agent_id=agent_id, detail=comment)


async def set_iteration_state(iteration_id, project_id, from_state, to_state,
                              who=None, agent_id=None, detail=None):
    """通用 CAS 状态迁移兜底（跨产线自定义状态机用）。"""
    return await _transition(iteration_id, project_id, from_state, to_state, 'set_state',
                             who=who, agent_id=agent_id, detail=detail)


async def list_iterations(project_id, status=None, limit=50) -> list:
    """列出迭代（可按状态过滤）。"""
    db, dbname = _get_db()
    async with db.sqlorContext(dbname) as sor:
        conditions = ["project_id=${pid}$"]
        params = {"pid": project_id}
        if status:
            conditions.append("status=${status}$")
            params["status"] = status
        where = " AND ".join(conditions)
        try:
            limit = int(limit)
        except (TypeError, ValueError):
            limit = 50
        sql = (f"SELECT * FROM {TABLE} WHERE {where} "
               f"ORDER BY created_at ASC LIMIT {limit}")
        recs = await sor.sqlExe(sql, params)
        # 释放 SELECT 元数据锁
        await sor.sqlExe("COMMIT", {})
        result = []
        for rec in (recs or []):
            result.append(_rec_to_dict(rec))
        return result


def _rec_to_dict(rec):
    """把 sqlor 记录对象转成 dict（sqlor 行是 DictObject，必须 dict(rec) 取列）。"""
    if isinstance(rec, dict):
        return dict(rec)
    try:
        return dict(rec)
    except (TypeError, ValueError):
        if hasattr(rec, 'to_dict'):
            try:
                return rec.to_dict()
            except Exception:
                pass
        return {}