package handler

import (
	"encoding/json"
	"fmt"
	"net/http"

	"bj_power_workstation/internal/svc"

	"github.com/zeromicro/go-zero/core/logx"
)

// mesRespCode 解析 MES 统一响应 {code,message}。
// MES 业务失败约定为 HTTP 200 + code!=0（httpx.Fail），HTTP 层无法区分，必须显式解析业务码。
// code==0 返回空串；code!=0 返回 message（供调用方直接透传给前端）。
func mesRespCode(respBody []byte) string {
	if len(respBody) == 0 {
		return ""
	}
	var mr struct {
		Code    int    `json:"code"`
		Message string `json:"message"`
	}
	if err := json.Unmarshal(respBody, &mr); err != nil {
		return ""
	}
	if mr.Code == 0 {
		return ""
	}
	if mr.Message != "" {
		return mr.Message
	}
	return fmt.Sprintf("MES 拒绝本次操作(业务码 %d)", mr.Code)
}

// processDoneHandler POST /api/report/process-done
// {sn, orderNo, processCode, stationNo, steps:[{stepId,name,value,text}], binds:[{materialCode,bindValue}], operator}
// 流程：先冲刷一轮积压 → 实时报 MES /api/internal/station/report；
// MES 不可达则写入 report_queue(kind=process_done) 并返回 data.queued=true（离线缓存稍后自动重传）；
// MES 业务拒绝（HTTP200+code!=0，如装配物料未绑齐/精密件SN重复）直接失败回前端，绝不入离线队。
// binds 为本次工序的装机绑定（结构件批次/精密件SN），MES 端落库 + 齐套强校验；离线重传时原样携带。
func processDoneHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var req struct {
			Sn          string `json:"sn"`
			OrderNo     string `json:"orderNo"`
			ProcessCode int    `json:"processCode"`
			StationNo   int    `json:"stationNo"`
			Steps       []struct {
				StepId int     `json:"stepId"`
				Name   string  `json:"name"`
				Value  float64 `json:"value"`
				Text   string  `json:"text"`
			} `json:"steps"`
			Binds []struct {
				MaterialCode string `json:"materialCode"`
				BindValue    string `json:"bindValue"`
			} `json:"binds"`
			Operator string `json:"operator"`
		}
		if err := parseJSON(r, &req); err != nil {
			fail(w, http.StatusBadRequest, "参数错误")
			return
		}
		if req.Sn == "" || req.ProcessCode <= 0 || req.StationNo <= 0 {
			fail(w, http.StatusBadRequest, "sn/processCode/stationNo 必填")
			return
		}

		// 先尽力冲刷历史积压，失败不影响本次上报
		ctx.Syncer.RunOnce(r.Context())

		body := map[string]any{
			"sn":          req.Sn,
			"orderNo":     req.OrderNo,
			"processCode": req.ProcessCode,
			"stationNo":   req.StationNo,
			"steps":       req.Steps,
			"operator":    req.Operator,
		}
		if len(req.Binds) > 0 {
			body["binds"] = req.Binds
		}
		payloadBytes, _ := json.Marshal(body)

		ctx.Store.AddEventLog(req.OrderNo, req.Operator, "process_done",
			"工序完成上报 sn="+req.Sn+" stationNo="+itoa(req.StationNo)+" processCode="+itoa(req.ProcessCode)+" binds="+itoa(len(req.Binds)))

		respBody, _, err := ctx.Mes.Post("/api/internal/station/report", json.RawMessage(payloadBytes))
		if err != nil {
			if qerr := ctx.Store.InsertQueueItem("process_done", string(payloadBytes)); qerr != nil {
				fail(w, http.StatusInternalServerError, "上报失败且离线队列写入失败："+qerr.Error())
				return
			}
			logx.Errorf("工序完成上报失败已离线排队: %v", err)
			ok(w, map[string]any{"queued": true})
			return
		}
		// MES 业务拒绝（HTTP200+code!=0）：缺料/SN冲突等，直接失败，不入队
		if msg := mesRespCode(respBody); msg != "" {
			logx.Errorf("工序完成上报被 MES 拒绝: %s", msg)
			fail(w, http.StatusConflict, msg)
			return
		}

		ok(w, map[string]any{"queued": false})
	}
}

// tempStoreHandler POST /api/report/temp-store
// {sn, orderNo, stationNo, processCode, operator} → 调 MES /api/internal/station/checkin（半成品入库）。
// 不可达时以同样 payload 写入 report_queue(kind=temp_store)。
func tempStoreHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var req struct {
			Sn          string `json:"sn"`
			OrderNo     string `json:"orderNo"`
			StationNo   int    `json:"stationNo"`
			ProcessCode int    `json:"processCode"`
			Operator    string `json:"operator"`
		}
		if err := parseJSON(r, &req); err != nil {
			fail(w, http.StatusBadRequest, "参数错误")
			return
		}
		if req.Sn == "" {
			fail(w, http.StatusBadRequest, "缺少 sn")
			return
		}

		// 先尽力冲刷历史积压，失败不影响本次上报
		ctx.Syncer.RunOnce(r.Context())

		body := map[string]any{
			"sn":          req.Sn,
			"orderNo":     req.OrderNo,
			"stationNo":   req.StationNo,
			"processCode": req.ProcessCode,
			"operator":    req.Operator,
		}
		payloadBytes, _ := json.Marshal(body)

		ctx.Store.AddEventLog(req.OrderNo, req.Operator, "temp_store",
			"暂存/退回库房 sn="+req.Sn+" stationNo="+itoa(req.StationNo))

		respBody, _, err := ctx.Mes.Post("/api/internal/station/checkin", json.RawMessage(payloadBytes))
		if err != nil {
			if qerr := ctx.Store.InsertQueueItem("temp_store", string(payloadBytes)); qerr != nil {
				fail(w, http.StatusInternalServerError, "上报失败且离线队列写入失败："+qerr.Error())
				return
			}
			logx.Errorf("暂存退库上报失败已离线排队: %v", err)
			ok(w, map[string]any{"queued": true})
			return
		}
		// MES 业务拒绝（HTTP200+code!=0）→ 直接失败，不入队
		if msg := mesRespCode(respBody); msg != "" {
			logx.Errorf("暂存退库被 MES 拒绝: %s", msg)
			fail(w, http.StatusConflict, msg)
			return
		}

		ok(w, map[string]any{"queued": false})
	}
}