package handler

import (
	"net/http"

	"chis_osi/osi"
)

// HealthCheckHandler 暴露健康体检查询的 HTTP 入口。
type HealthCheckHandler struct {
	client *osi.Client
}

func NewHealthCheckHandler(client *osi.Client) *HealthCheckHandler {
	return &HealthCheckHandler{client: client}
}

// Last 处理 GET /api/health-check/last?idCard=..|phrid=..|empiId=..
// 返回某人最近一次体检的平台完整响应（含全部子节点，见 docs/04 §11）。
func (h *HealthCheckHandler) Last(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSONError(w, http.StatusMethodNotAllowed, "only GET is supported")
		return
	}
	q := r.URL.Query()
	query := osi.FindHealthCheckQuery{
		IDCard: q.Get("idCard"),
		PHRID:  q.Get("phrid"),
		EMPIID: q.Get("empiId"),
	}
	if query.IDCard == "" && query.PHRID == "" && query.EMPIID == "" {
		writeJSONError(w, http.StatusBadRequest, "provide one of: idCard, phrid, empiId")
		return
	}
	_, result, err := h.client.LastHealthCheck(r.Context(), query)
	writeRawOrError(w, result, err)
}

// List 处理 GET /api/health-check/list?checkYear=..&idCard=..&checkType=..&page=..&rows=..
// 返回某年度已检/未检人员名单的平台完整响应（名单，非体检明细，见 docs/04 §11.4）。
func (h *HealthCheckHandler) List(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSONError(w, http.StatusMethodNotAllowed, "only GET is supported")
		return
	}
	q := r.URL.Query()
	if q.Get("checkYear") == "" {
		writeJSONError(w, http.StatusBadRequest, "checkYear is required")
		return
	}
	query := osi.ListHealthCheckQuery{
		CheckYear: q.Get("checkYear"),
		IDCard:    q.Get("idCard"),
		CheckType: q.Get("checkType"),
		Page:      q.Get("page"),
		Rows:      q.Get("rows"),
	}
	_, result, err := h.client.ListHealthCheckPeople(r.Context(), query)
	writeRawOrError(w, result, err)
}

// writeRawOrError 拿到平台响应就原样回写完整 JSON，否则按错误返回。
func writeRawOrError(w http.ResponseWriter, result osi.Result, err error) {
	if len(result.Raw) > 0 {
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		_, _ = w.Write(result.Raw)
		return
	}
	if err != nil {
		writeJSONError(w, http.StatusBadGateway, err.Error())
		return
	}
	writeJSONError(w, http.StatusBadGateway, "empty response from OSI")
}