package gateway

import (
	"context"
	"errors"
	"net/http"

	apperr "git.yeij.top/AskaEth/Cyrene_v2/internal/errors"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/memory"
)

// 本文件是记忆整理**手动真跑**入口（切片 TIDY-1）：
// POST /api/v1/admin/memories/tidy/run —— 立刻按同一套规则跑一轮，写候选 + 写运行
// 留痕，并把「新增/合并/软删各多少 + 耗时」如实回执。审计由领域侧 TidyService 记
// `memory.tidy.run`（一次点击一条，本文件不重复）。

// adminMemoryTidyRun 处理 POST /api/v1/admin/memories/tidy/run：手动**真跑**一轮
// （与心跳、试算走同一套规则与配置；写候选 + 运行留痕）。它是「panic button」：
// 主人不必等到 23:00 就能让整理真的产出一批待定候选，再决定应用。
//
// 审计不在这里写 —— 领域侧 TidyService 已按 design §8 记 `memory.tidy.run`
// （result 里带 trigger=manual / run_id / 计数）。一次点击一条审计。
func (s *Server) adminMemoryTidyRun(w http.ResponseWriter, r *http.Request) {
	if s.memoryTidy == nil {
		writeError(w, apperr.Wrap(apperr.ErrInternal, tidyUnavailableCode, "记忆整理服务未接线"))
		return
	}
	runner, ok := s.memoryTidy.(MemoryTidyRunner)
	if !ok {
		writeError(w, &apperr.AppError{
			Code:     "tidy_run_unavailable",
			Message:  "记忆整理真跑入口未接线（只有只读试算可用）",
			HTTPCode: http.StatusInternalServerError,
		})
		return
	}
	ctx, cancel := context.WithTimeout(r.Context(), tidyRunTimeout)
	defer cancel()

	stats, err := runner.ManualRun(ctx)
	if err != nil {
		writeError(w, tidyRunAppError(err))
		return
	}
	s.log.Info("memory tidy manual run finished",
		"run_id", stats.RunID, "scanned", stats.Scanned, "candidates", stats.Candidates,
		"duplicates", stats.Duplicates, "duration_ms", stats.DurationMS)
	writeJSON(w, http.StatusOK, adminTidyRunResponse(stats))
}

// tidyRunAppError 把「真跑」失败映射成诚实的错误码。映射表与试算那张
// （tidyDryRunAppError）**分开**：试算的 500/409 文案讲的是「没产出候选」，
// 真跑讲的是「没跑成」—— 同一类别、不同事实，混用会让排障读到错的那句。
func tidyRunAppError(err error) *apperr.AppError {
	switch {
	case errors.Is(err, memory.ErrTidyDisabled):
		return &apperr.AppError{
			Code:     "tidy_disabled",
			Message:  "记忆整理已被配置关闭（MEMORY_TIDY_ENABLED=false）",
			HTTPCode: http.StatusConflict,
		}
	case errors.Is(err, context.DeadlineExceeded):
		return &apperr.AppError{
			Code:     "tidy_timeout",
			Message:  "记忆整理真跑超时（本轮未完整跑完，已跑部分仍写入了留痕）",
			HTTPCode: http.StatusServiceUnavailable,
		}
	default:
		return apperr.Wrap(apperr.ErrInternal, "tidy_run_failed", "记忆整理真跑失败")
	}
}

// adminTidyRunResponse 投影真跑回执。
func adminTidyRunResponse(stats memory.TidyStats) AdminTidyRunResponse {
	byAction := stats.ByAction
	if byAction == nil {
		byAction = map[string]int{}
	}
	reasons := stats.VetoReasons
	if reasons == nil {
		reasons = map[string]int{}
	}
	return AdminTidyRunResponse{
		RunID:               stats.RunID,
		Trigger:             "manual",
		RuleVersion:         memory.TidyRuleVersion,
		DurationMs:          stats.DurationMS,
		Partitions:          stats.Partitions,
		Scanned:             stats.Scanned,
		Compared:            stats.Compared,
		Pairs:               stats.Pairs,
		Vetoed:              stats.Vetoed,
		Errors:              stats.Errors,
		Truncated:           stats.Truncated,
		VetoReasons:         reasons,
		CandidatesCreated:   stats.Candidates,
		CandidatesDuplicate: stats.Duplicates,
		CandidatesByAction:  byAction,
		DedupeGroups:        stats.DedupeGroups,
		DedupeRowsReducible: stats.DedupeRows,
		DedupeTruncated:     stats.DedupeTruncated,
	}
}