package handler

import (
	"encoding/json"
	"io"
	"net/http"
	"net/url"
	"strings"

	"bj_power_workstation/internal/svc"

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

// passJSON 原样透传 MES 的 {code,message,data} 响应体（不再二次包装）。
func passJSON(w http.ResponseWriter, body []byte) {
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.WriteHeader(http.StatusOK)
	_, _ = w.Write(body)
}

// wipHandler GET /api/wip?stationNo= —— 代理 MES /api/internal/workpieces/in-process。
// 在制品默认展示（5.2）：停在本工位/上线位(0)/下线位(13) 的未完工工件列表。
func wipHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		params := url.Values{}
		if sn := strings.TrimSpace(r.URL.Query().Get("stationNo")); sn != "" {
			params.Set("stationNo", sn)
		}
		body, _, err := ctx.Mes.Get("/api/internal/workpieces/in-process", params)
		if err != nil {
			fail(w, http.StatusBadGateway, "MES 服务不可达："+errString(err))
			return
		}
		passJSON(w, body)
	}
}

// bomHandler GET /api/bom?productCode=&bomName= —— 代理 MES /api/internal/bom。
// 上线建档「领料确认」按物料清单展示应领料。
func bomHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		params := url.Values{}
		if v := strings.TrimSpace(r.URL.Query().Get("productCode")); v != "" {
			params.Set("productCode", v)
		}
		if v := strings.TrimSpace(r.URL.Query().Get("bomName")); v != "" {
			params.Set("bomName", v)
		}
		body, _, err := ctx.Mes.Get("/api/internal/bom", params)
		if err != nil {
			fail(w, http.StatusBadGateway, "MES 服务不可达："+errString(err))
			return
		}
		passJSON(w, body)
	}
}

// orderQueryHandler GET /api/order/query?orderNo= —— 代理 MES /api/internal/order/query。
// 上线建档选工单后带出产品编码/名称（用于查 BOM 应领料）。
func orderQueryHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		params := url.Values{}
		if v := strings.TrimSpace(r.URL.Query().Get("orderNo")); v != "" {
			params.Set("orderNo", v)
		}
		body, _, err := ctx.Mes.Get("/api/internal/order/query", params)
		if err != nil {
			fail(w, http.StatusBadGateway, "MES 服务不可达："+errString(err))
			return
		}
		passJSON(w, body)
	}
}

// traceHandler GET /api/trace?sn= —— 代理 MES /api/internal/workpiece/trace。
// 下线完工面板扫 SN 后展示工件状态/工序时间线/拧紧等追溯信息。
func traceHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		sn := strings.TrimSpace(r.URL.Query().Get("sn"))
		if sn == "" {
			fail(w, http.StatusBadRequest, "缺少 sn 参数")
			return
		}
		body, _, err := ctx.Mes.Get("/api/internal/workpiece/trace", url.Values{"sn": {sn}})
		if err != nil {
			fail(w, http.StatusBadGateway, "MES 服务不可达："+errString(err))
			return
		}
		passJSON(w, body)
	}
}

// onlineHandler POST /api/workpiece/online —— 上线建档（StationNo=0）。
// {sn, orderNo, workOrderId, processSeq, operator}；MES 不可达时写离线队列(kind=online_register)稍后重传。
func onlineHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		payload, err := io.ReadAll(r.Body)
		if err != nil {
			fail(w, http.StatusBadRequest, "请求体读取失败")
			return
		}
		var req struct {
			Sn       string `json:"sn"`
			OrderNo  string `json:"orderNo"`
			Operator string `json:"operator"`
		}
		_ = json.Unmarshal(payload, &req)
		if strings.TrimSpace(req.Sn) == "" {
			fail(w, http.StatusBadRequest, "缺少 sn")
			return
		}
		ctx.Syncer.RunOnce(r.Context())
		ctx.Store.AddEventLog(req.OrderNo, req.Operator, "online_register", "上线建档 sn="+req.Sn)

		q := url.Values{}
		if req.Operator != "" {
			q.Set("operator", req.Operator)
		}
		respBody, _, err := ctx.Mes.Post("/api/internal/workpiece/online?"+q.Encode(), json.RawMessage(payload))
		if err != nil {
			if qerr := ctx.Store.InsertQueueItem("online_register", string(payload)); qerr != nil {
				fail(w, http.StatusInternalServerError, "上报失败且离线队列写入失败："+qerr.Error())
				return
			}
			logx.Errorf("上线建档失败已离线排队: %v", err)
			ok(w, map[string]any{"queued": true})
			return
		}
		if msg := mesRespCode(respBody); msg != "" {
			fail(w, http.StatusConflict, msg)
			return
		}
		ok(w, map[string]any{"queued": false})
	}
}

// doneHandler POST /api/workpiece/done —— 下线完工入库（StationNo=13）。
// {sn, batchItems, serialItems, operator}；完工内部自动回流 WMS 成品库存；
// MES 不可达时写离线队列(kind=offline_finish)稍后重传。
func doneHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		payload, err := io.ReadAll(r.Body)
		if err != nil {
			fail(w, http.StatusBadRequest, "请求体读取失败")
			return
		}
		var req struct {
			Sn       string `json:"sn"`
			Operator string `json:"operator"`
		}
		_ = json.Unmarshal(payload, &req)
		if strings.TrimSpace(req.Sn) == "" {
			fail(w, http.StatusBadRequest, "缺少 sn")
			return
		}
		ctx.Syncer.RunOnce(r.Context())
		ctx.Store.AddEventLog("", req.Operator, "offline_finish", "下线完工入库 sn="+req.Sn)

		q := url.Values{}
		if req.Operator != "" {
			q.Set("operator", req.Operator)
		}
		respBody, _, err := ctx.Mes.Post("/api/internal/workpiece/done?"+q.Encode(), json.RawMessage(payload))
		if err != nil {
			if qerr := ctx.Store.InsertQueueItem("offline_finish", string(payload)); qerr != nil {
				fail(w, http.StatusInternalServerError, "上报失败且离线队列写入失败："+qerr.Error())
				return
			}
			logx.Errorf("下线完工上报失败已离线排队: %v", err)
			ok(w, map[string]any{"queued": true})
			return
		}
		if msg := mesRespCode(respBody); msg != "" {
			fail(w, http.StatusConflict, msg)
			return
		}
		ok(w, map[string]any{"queued": false})
	}
}