package handler

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

	"bj_power_workstation/internal/svc"
)

// ============ 产线点位 / 上位机移料 / 叫料（代理 MES 内部 API） ============
// MES 侧对应接口均以 X-API-TOKEN 保护（/api/internal/line/*），本服务用配置 token 转发，
// 前端只与本服务交互（JWT 登录）。MES 响应体原样透传（{code,message,data}）。

// mesJSON 透传 MES 响应体；网络不可达时返回 502 中文提示。
func mesJSON(w http.ResponseWriter, body []byte, err error) bool {
	if err != nil {
		fail(w, http.StatusBadGateway, "MES 服务不可达："+errString(err))
		return false
	}
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.WriteHeader(http.StatusOK)
	_, _ = w.Write(body)
	return true
}

// linePointsHandler GET /api/line/points（产线点位台账：当前每个点位上的工件）
func linePointsHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		body, _, err := ctx.Mes.Get("/api/internal/line/points", nil)
		mesJSON(w, body, err)
	}
}

// lineMovesHandler GET /api/line/moves?status=&sn=&limit=（移料指令列表）
func lineMovesHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		q := url.Values{}
		for _, k := range []string{"status", "sn", "limit"} {
			if v := strings.TrimSpace(r.URL.Query().Get(k)); v != "" {
				q.Set(k, v)
			}
		}
		body, _, err := ctx.Mes.Get("/api/internal/line/moves", q)
		mesJSON(w, body, err)
	}
}

// lineMoveHandler POST /api/line/move（下发移料指令：起点位 → 目标点位）
// 请求体原样转发：{sn, fromPoint, toPoint, orderNo}
func lineMoveHandler(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"`
			FromPoint string `json:"fromPoint"`
			ToPoint   string `json:"toPoint"`
		}
		_ = json.Unmarshal(payload, &probe)
		if probe.Sn == "" || probe.FromPoint == "" || probe.ToPoint == "" {
			fail(w, http.StatusBadRequest, "工件SN、起点位、目标点位必填")
			return
		}
		body, _, err := ctx.Mes.Post("/api/internal/line/move", json.RawMessage(payload))
		mesJSON(w, body, err)
	}
}

// lineArriveHandler POST /api/line/move/arrive（工件到位：回写台账并闭环指令）
func lineArriveHandler(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 {
			CmdNo string `json:"cmdNo"`
		}
		_ = json.Unmarshal(payload, &probe)
		if probe.CmdNo == "" {
			fail(w, http.StatusBadRequest, "缺少指令号 cmdNo")
			return
		}
		body, _, err := ctx.Mes.Post("/api/internal/line/move/arrive", json.RawMessage(payload))
		mesJSON(w, body, err)
	}
}

// lineAckHandler POST /api/line/move/ack（PLC 应答：通常由 PLC 侧调用，终端手动应答也走这里）
func lineAckHandler(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/line/move/ack", json.RawMessage(payload))
		mesJSON(w, body, err)
	}
}

// lineOccupyHandler POST /api/line/occupy（点位人工记账：IN 上料 / OUT 下料）
// 请求体：{pointNo, sn, orderNo, action} —— operator 由本服务补当前登录人。
func lineOccupyHandler(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 map[string]any
		if err := json.Unmarshal(payload, &req); err != nil {
			fail(w, http.StatusBadRequest, "请求体解析失败")
			return
		}
		if req["operator"] == nil || req["operator"] == "" {
			if u := currentUsername(r); u != "" {
				req["operator"] = u
			}
		}
		body, _ := json.Marshal(req)
		resp, _, err := ctx.Mes.Post("/api/internal/line/occupy", json.RawMessage(body))
		mesJSON(w, resp, err)
	}
}

// lineCallMaterialHandler POST /api/line/call-material（工位终端叫料：选本工位接驳台）
// 请求体原样转发：{stationNo, dock, orderNo, items:[{materialCode, materialName, unit, manageMode, qty}]}
func lineCallMaterialHandler(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 map[string]any
		if err := json.Unmarshal(payload, &req); err != nil {
			fail(w, http.StatusBadRequest, "请求体解析失败")
			return
		}
		if req["operator"] == nil || req["operator"] == "" {
			if u := currentUsername(r); u != "" {
				req["operator"] = u
			}
		}
		body, _ := json.Marshal(req)
		resp, _, err := ctx.Mes.Post("/api/internal/line/call-material", json.RawMessage(body))
		mesJSON(w, resp, err)
	}
}