package upstream

import (
	"context"
	"encoding/json"
	"errors"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/gogf/gf/v2/errors/gcode"
	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/os/gcfg"
	"git.5iot.com/iotlcm-public/iotlcm-admin-svr/internal/model"
)

func TestTestChannelPostsOneTenantBoundRequestToGateway(t *testing.T) {
	const gatewayBody = `{"code":0,"message":"success","data":{"items":[{"key":"simStatus","name":"卡状态","status":"success"}]}}`
	var requestBody model.UpstreamChannelTestRequest
	requestCount := 0
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/internal/channel/test" || r.Method != http.MethodPost {
			t.Fatalf("unexpected request: %s %s", r.Method, r.URL.Path)
		}
		requestCount++
		if r.Header.Get("X-Internal-Token") != "" {
			t.Errorf("unexpected internal token header")
		}
		if err := json.NewDecoder(r.Body).Decode(&requestBody); err != nil {
			t.Fatal(err)
		}
		_, _ = w.Write([]byte(gatewayBody))
	}))
	defer server.Close()

	oldAdapter := g.Cfg().GetAdapter()
	adapter, err := gcfg.NewAdapterContent(`upstream:
  gateway:
    address: "` + strings.TrimPrefix(server.URL, "http://") + `"
    timeout: 1s
`)
	if err != nil {
		t.Fatal(err)
	}
	g.Cfg().SetAdapter(adapter)
	t.Cleanup(func() { g.Cfg().SetAdapter(oldAdapter) })

	output, err := NewUpstreamChan().TestChannel(context.Background(), &model.UpstreamChannelTestRequest{
		ChannelID: 42, TenantID: "tenant-a", InputMode: "complete",
		ICCID: "iccid", IMSI: "imsi", MSISDN: "msisdn", Items: []string{"simStatus"},
	})
	if err != nil {
		t.Fatal(err)
	}
	if requestCount != 1 {
		t.Fatalf("request count=%d, want one", requestCount)
	}
	if requestBody.ChannelID != 42 || requestBody.TenantID != "tenant-a" || len(requestBody.Items) != 1 {
		t.Fatalf("unexpected request body: %+v", requestBody)
	}
	if output == nil || len(output.Items) != 1 || output.Items[0].Status != "success" {
		t.Fatalf("unexpected output: %+v", output)
	}
	if output.GatewayResponseRaw != gatewayBody {
		t.Fatalf("raw response=%q, want %q", output.GatewayResponseRaw, gatewayBody)
	}
}

func TestTestChannelPreservesGatewayErrorResponses(t *testing.T) {
	responseBody := ""
	responseStatus := http.StatusOK
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(responseStatus)
		_, _ = w.Write([]byte(responseBody))
	}))
	defer server.Close()

	oldAdapter := g.Cfg().GetAdapter()
	adapter, err := gcfg.NewAdapterContent(`upstream:
  gateway:
    address: "` + strings.TrimPrefix(server.URL, "http://") + `"
    timeout: 1s
`)
	if err != nil {
		t.Fatal(err)
	}
	g.Cfg().SetAdapter(adapter)
	t.Cleanup(func() { g.Cfg().SetAdapter(oldAdapter) })

	for _, tc := range []struct {
		name        string
		body        string
		status      int
		wantMessage string
	}{
		{"business error", `{"code":13000,"message":"系统忙","data":{"items":[]}}`, http.StatusOK, "系统忙"},
		{"completion error", `{"code":50,"message":"carrier did not return complete card identifiers","data":null}`, http.StatusOK, "carrier did not return complete card identifiers"},
		{"empty message", `{"code":50,"message":"","data":null}`, http.StatusOK, "上游通道测试失败"},
		{"HTTP error", `{"code":13000,"message":"网关故障"}`, http.StatusBadGateway, "网关故障"},
		{"invalid JSON", `gateway unavailable`, http.StatusOK, "解析上游通道测试响应失败"},
		{"schema mismatch", `{"code":0,"data":{"items":"invalid"}}`, http.StatusOK, "解析上游通道测试响应失败"},
	} {
		t.Run(tc.name, func(t *testing.T) {
			responseBody = tc.body
			responseStatus = tc.status
			output, err := NewUpstreamChan().TestChannel(context.Background(), &model.UpstreamChannelTestRequest{
				ChannelID: 42, TenantID: "tenant-a", InputMode: "complete",
				ICCID: "iccid", IMSI: "imsi", MSISDN: "msisdn",
			})
			if err == nil || output != nil {
				t.Fatalf("failure must remain an error: output=%+v err=%v", output, err)
			}
			var diagnostic *model.TSimChannelsTestError
			if !errors.As(err, &diagnostic) || diagnostic.GatewayResponseRaw != tc.body {
				t.Fatalf("missing raw error response: %+v", err)
			}
			if !strings.Contains(err.Error(), tc.wantMessage) || gerror.Code(err) != gcode.CodeNil {
				t.Fatalf("original error changed: %v code=%v", err, gerror.Code(err))
			}
			if err.Error() != diagnostic.Err.Error() || !errors.Is(err, diagnostic.Err) {
				t.Fatalf("original error chain changed: %v", err)
			}
		})
	}

	t.Run("individual failures remain results", func(t *testing.T) {
		responseStatus = http.StatusOK
		responseBody = `{"code":0,"message":"success","data":{"items":[{"key":"simStatus","status":"failed","errorCode":9999,"message":"carrier rejected"},{"key":"simSession","status":"timeout","message":"channel test item timed out"}]}}`
		output, err := NewUpstreamChan().TestChannel(context.Background(), &model.UpstreamChannelTestRequest{ChannelID: 42, TenantID: "tenant-a"})
		if err != nil || output == nil {
			t.Fatalf("single-item failures must not fail the whole request: %v", err)
		}
		if output.GatewayResponseRaw != responseBody || len(output.Items) != 2 || output.Items[0].ErrorCode != 9999 || output.Items[0].Message != "carrier rejected" || output.Items[1].Status != "timeout" {
			t.Fatalf("item results changed: %+v", output)
		}
	})
}