"""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:
        # 迭代序号 seq_no = 该项目 max(seq_no) + 1（1,2,3... 顺序编号）
        r = await sor.sqlExe(
            f"SELECT COALESCE(MAX(seq_no),0) AS m FROM {TABLE} WHERE project_id=${{pid}}$",
            {"pid": project_id})
        await sor.sqlExe("COMMIT", {})
        seq_no = int(getattr(r[0], 'm', 0) or 0) + 1
        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,
            'seq_no': seq_no,
            '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 seq_no=%s", iid, project_id, seq_no)
        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 seq_no 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


async def get_current_iteration(sor, project_id):
    """当前迭代 = status='in_progress' 的唯一迭代（seq_no 最小）。无则返回 None。

    取代旧的「ORDER BY created_at DESC LIMIT 1」推断：当前迭代是显式状态，
    不再靠时间戳猜。传入 sor（调用点已在 sqlorContext 内，避免嵌套开连接）。
    """
    recs = await sor.sqlExe(
        f"SELECT * FROM {TABLE} WHERE project_id=${{pid}}$ AND status='in_progress' "
        "ORDER BY seq_no ASC LIMIT 1",
        {"pid": project_id})
    await sor.sqlExe("COMMIT", {})
    if recs:
        return _rec_to_dict(recs[0])
    return None


async def _active_task_ids(sor, project_id, iteration_name):
    """某迭代内所有活跃任务的 ID 列表（非终态：submitted/running/review/qc_review/waiting）。

    任务经 params.iteration_id（存迭代名）归属迭代；已终态(completed/approved/cancelled/failed)不计。
    """
    if not iteration_name:
        return []
    recs = await sor.sqlExe(
        "SELECT id FROM pipeline_tasks WHERE tenant_id=${pid}$ "
        "AND state NOT IN ('completed','approved','cancelled','failed') "
        "AND JSON_UNQUOTE(JSON_EXTRACT(params,'$.iteration_id'))=${nm}$",
        {"pid": project_id, "nm": iteration_name})
    await sor.sqlExe("COMMIT", {})
    return [getattr(r, 'id', '') for r in (recs or []) if getattr(r, 'id', '')]


async def _cancel_active_tasks(sor, project_id, iteration_name):
    """作废某迭代内所有活跃任务（非终态 → cancelled + 清 claimed_by）+ 关闭其 pending 问题。返回作废数量。"""
    ids = await _active_task_ids(sor, project_id, iteration_name)
    if ids:
        in_clause = ",".join(["'" + x.replace("'", "''") + "'" for x in ids])
        await sor.sqlExe(
            f"UPDATE pipeline_tasks SET state='cancelled', claimed_by=NULL, updated_at=NOW() "
            f"WHERE id IN ({in_clause})", {})
    # 关闭该迭代的 pending 问题（随迭代作废，不再冒泡）：问题通过 task_id 关联任务，任务通过
    # params.iteration_id 关联迭代。不关闭则旧迭代问题持续 pending 冒泡、阻塞诊断视图（2026-08 实测）。
    await sor.sqlExe(
        "UPDATE pipeline_agent_questions SET status='answered', "
        "answer='旧迭代已作废，本问题随迭代关闭', answered_by='system', answer_source='main_agent', updated_at=NOW() "
        "WHERE tenant_id=${pid}$ AND status='pending' AND task_id IN ("
        "SELECT id FROM pipeline_tasks WHERE tenant_id=${pid}$ "
        "AND JSON_UNQUOTE(JSON_EXTRACT(params,'$.iteration_id'))=${iter}$)",
        {"pid": project_id, "iter": iteration_name})
    return len(ids)


async def start_next_iteration(project_id, who=None, agent_id=None, confirm=False):
    """启动下一个迭代（用户指令推进）：

    1. 若存在当前迭代(in_progress)且有活跃任务，须 confirm=True 才强制完成它 + 作废活跃任务
       （否则返回 CONFIRM 提示，等用户确认）。
    2. 找下一个 planning 迭代（seq_no 最小且 > 已结束迭代的最大 seq_no），start 它。
    返回 (ok, message)。
    """
    if not project_id:
        return False, "缺少 project_id"
    db, dbname = _get_db()
    async with db.sqlorContext(dbname) as sor:
        # 人类任务门禁：当前迭代有未完成人类任务时，阻止切迭代（须先完成 + QC 合格）
        from .human_task_capability import has_blocking_human_task
        if await has_blocking_human_task(sor, project_id):
            return False, "当前迭代存在未完成的人类任务，须完成并通过 QC 后才能切换迭代"
        cur = await get_current_iteration(sor, project_id)
        # 二次确认：当前迭代有活跃任务时，须 confirm=True 才作废（否则返回确认提示）
        if cur and not confirm:
            cur_name = cur.get('iteration_name', '') or ''
            active_ids = await _active_task_ids(sor, project_id, cur_name)
            if active_ids:
                return False, (f"CONFIRM: 当前迭代「{cur_name}」还有 {len(active_ids)} 个未完成任务，"
                               f"确认作废这些任务并启动下一迭代？请回复「确认」，agent 将传 confirm=true 执行")
        # 1. 强制完成当前迭代 + 作废其活跃任务
        if cur:
            cur_id = cur.get('id', '')
            cur_name = cur.get('iteration_name', '') or ''
            if cur_name:
                await _cancel_active_tasks(sor, project_id, cur_name)
            await sor.sqlExe(
                f"UPDATE {TABLE} SET status='completed', completed_at=NOW(), updated_at=NOW() "
                f"WHERE id=${{iid}}$ AND project_id=${{pid}}$ AND status='in_progress'",
                {"iid": cur_id, "pid": project_id})
            await record_audit(project_id, TABLE, cur_id, 'complete',
                               from_state=S_IN_PROGRESS, to_state=S_COMPLETED,
                               who=_normalize_role(who), agent_id=agent_id,
                               detail='启动下一迭代时强制完成', sor=sor)
            logger.info("start_next_iteration: 强制完成当前迭代 %s (%s)", cur_id, cur_name)
        # 2. 找下一个 planning 迭代（seq_no > 已结束迭代的最大 seq_no）
        nxt = await sor.sqlExe(
            f"SELECT * FROM {TABLE} WHERE project_id=${{pid}}$ AND status='planning' "
            f"AND seq_no > (SELECT COALESCE(MAX(seq_no),0) FROM {TABLE} "
            f"WHERE project_id=${{pid}}$ AND status IN ('completed','cancelled')) "
            "ORDER BY seq_no ASC LIMIT 1",
            {"pid": project_id})
        await sor.sqlExe("COMMIT", {})
        if not nxt:
            return False, "没有可启动的下一个迭代（请先 create_iteration）"
        nxt_id = getattr(nxt[0], 'id', '')
        nxt_name = getattr(nxt[0], 'iteration_name', '')
        nxt_seq = getattr(nxt[0], 'seq_no', '')
        # 3. start 它（planning → in_progress）
        await sor.sqlExe(
            f"UPDATE {TABLE} SET status='in_progress', started_at=NOW(), updated_at=NOW() "
            f"WHERE id=${{iid}}$ AND project_id=${{pid}}$ AND status='planning'",
            {"iid": nxt_id, "pid": project_id})
        await record_audit(project_id, TABLE, nxt_id, 'start',
                           from_state=S_PLANNING, to_state=S_IN_PROGRESS,
                           who=_normalize_role(who), agent_id=agent_id, sor=sor)
        logger.info("start_next_iteration: 启动 %s (seq_no=%s)", nxt_name, nxt_seq)
        # 切迭代后自动恢复项目推进：旧迭代的 paused（任务达上限触发 failed_poller 自动 pause）诱因
        # 已随活跃任务作废而消除，新迭代是新开始，项目应恢复 active——否则 PM poller 会因 paused
        # 跳过新迭代的 review 任务，导致新迭代卡在 PM 审核无人认领（2026-08 实测：切迭代后 design
        # 任务卡 review 27 分钟，根因就是旧迭代遗留的 paused 未清除）。
        from .project_capability import resume_project
        _rok, _rmsg = await resume_project(project_id, who=_normalize_role(who), agent_id=agent_id)
        logger.info("start_next_iteration: resume_project ok=%s (%s)", _rok, _rmsg)
        return True, f"已启动迭代「{nxt_name}」(seq_no={nxt_seq})"


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 {}