package handler

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

	"bj_power_workstation/internal/svc"
)

// bindPanelHandler 代理 MES GET /api/internal/workpiece/bind-panel?sn=&flowId=。
// 工位终端扫码工件后按工位绑定工艺(flowId)拉取应装/已装物料清单（装机绑定引导），响应原样透传。
func bindPanelHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		sn := strings.TrimSpace(r.URL.Query().Get("sn"))
		flowId := strings.TrimSpace(r.URL.Query().Get("flowId"))
		if sn == "" || flowId == "" {
			fail(w, http.StatusBadRequest, "缺少 sn / flowId 参数")
			return
		}
		body, _, err := ctx.Mes.Get("/api/internal/workpiece/bind-panel",
			url.Values{"sn": {sn}, "flowId": {flowId}})
		if err != nil {
			fail(w, http.StatusBadGateway, "MES 服务不可达："+errString(err))
			return
		}
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write(body)
	}
}

// bindRecordHandler POST /api/bind/record —— 工位扫/录一个物料（SN/批次）→ MES 装机绑定。
// 透传原 body，MES 负责校验（料是否属于本工艺装配 / 电气件SN防重 / 幂等）。
// 请求体按定稿契约：{sn, flowId, stationNo, items:[{materialCode, bindValue}]}。
func bindRecordHandler(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 probe struct {
			Sn     string `json:"sn"`
			FlowId int    `json:"flowId"`
		}
		_ = json.Unmarshal(payload, &probe)
		if probe.Sn == "" || probe.FlowId <= 0 {
			fail(w, http.StatusBadRequest, "sn / flowId 必填")
			return
		}
		body, _, err := ctx.Mes.Post("/api/internal/workpiece/binds", json.RawMessage(payload))
		if err != nil {
			fail(w, http.StatusBadGateway, "MES 服务不可达："+errString(err))
			return
		}
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write(body)
	}
}

// bindRemoveHandler POST /api/bind/remove —— 撤销误绑（未报工前）
func bindRemoveHandler(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
		}
		body, _, err := ctx.Mes.Post("/api/internal/workpiece/binds/remove", json.RawMessage(payload))
		if err != nil {
			fail(w, http.StatusBadGateway, "MES 服务不可达："+errString(err))
			return
		}
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write(body)
	}
}