package managed

import (
	"bytes"
	"context"
	"encoding/json"
	"io"
	"net/http"
	"strings"
	"testing"
)

type roundTripFunc func(req *http.Request) (*http.Response, error)

func (fn roundTripFunc) RoundTrip(req *http.Request) (*http.Response, error) {
	return fn(req)
}

func TestRemoteClientRoundTrip(t *testing.T) {
	t.Parallel()

	storeConfig := map[string]any{
		"config_path": "/srv/store/config/local.yaml",
		"stream": map[string]any{
			"rtsp_url": "rtsp://store-old/stream",
		},
	}

	client := NewRemoteClient(&http.Client{Transport: roundTripFunc(func(r *http.Request) (*http.Response, error) {
		response := func(status int, body any) (*http.Response, error) {
			data, err := json.Marshal(body)
			if err != nil {
				return nil, err
			}
			return &http.Response{
				StatusCode: status,
				Header:     make(http.Header),
				Body:       io.NopCloser(bytes.NewReader(data)),
			}, nil
		}

		switch {
		case r.Method == http.MethodGet && r.URL.Path == "/store/api/manage/config":
			return response(http.StatusOK, storeConfig)
		case r.Method == http.MethodPut && r.URL.Path == "/store/api/manage/config":
			var payload map[string]string
			if err := json.NewDecoder(r.Body).Decode(&payload); err != nil {
				t.Fatalf("decode update payload: %v", err)
			}
			storeConfig["stream"].(map[string]any)["rtsp_url"] = payload["rtsp_url"]
			return response(http.StatusOK, storeConfig)
		case r.Method == http.MethodGet && r.URL.Path == "/store/api/manage/summary":
			return response(http.StatusOK, ResultSummary{
				ResultType:     "store_dwell_alert",
				Headline:       "Latest report shows 1 active customers, longest dwell 900s",
				LastResultTime: "2026-04-16T10:00:00+08:00",
				Metrics: map[string]any{
					"active_customer_count": 1,
					"longest_dwell_seconds": 900,
				},
			})
		case r.Method == http.MethodGet && r.URL.Path == "/store/api/manage/files":
			return response(http.StatusOK, map[string]any{
				"files": []ResultFile{{
					Path: "logs/events.jsonl",
					Name: "events.jsonl",
				}},
			})
		case r.Method == http.MethodGet && r.URL.Path == "/store/api/manage/files/preview":
			return response(http.StatusOK, FilePreview{
				Path:  "logs/events.jsonl",
				Lines: []string{"line1", "line2"},
				Count: 2,
			})
		case r.Method == http.MethodGet && r.URL.Path == "/store/api/manage/files/download":
			return &http.Response{
				StatusCode: http.StatusOK,
				Header: http.Header{
					"Content-Disposition": []string{`attachment; filename="events.jsonl"`},
				},
				Body: io.NopCloser(strings.NewReader("downloaded")),
			}, nil
		default:
			t.Fatalf("unexpected child request: %s %s", r.Method, r.URL.String())
			return nil, nil
		}
	})})

	service := Service{
		ID:         "store_dwell_alert",
		APIBaseURL: "http://managed.invalid/store",
	}

	configPayload, err := client.GetConfig(context.Background(), service)
	if err != nil {
		t.Fatalf("GetConfig() error = %v", err)
	}
	if got := configPayload["config_path"]; got != "/srv/store/config/local.yaml" {
		t.Fatalf("config_path = %#v", got)
	}

	if _, err := client.UpdateRTSP(context.Background(), service, "rtsp://store-new/stream"); err != nil {
		t.Fatalf("UpdateRTSP() error = %v", err)
	}
	if got := storeConfig["stream"].(map[string]any)["rtsp_url"]; got != "rtsp://store-new/stream" {
		t.Fatalf("updated rtsp = %#v", got)
	}

	summary, err := client.GetSummary(context.Background(), service)
	if err != nil {
		t.Fatalf("GetSummary() error = %v", err)
	}
	if summary.ResultType != "store_dwell_alert" {
		t.Fatalf("summary.ResultType = %q", summary.ResultType)
	}

	files, err := client.GetFiles(context.Background(), service)
	if err != nil {
		t.Fatalf("GetFiles() error = %v", err)
	}
	if len(files) != 1 || files[0].Path != "logs/events.jsonl" {
		t.Fatalf("files = %#v", files)
	}

	preview, err := client.PreviewFile(context.Background(), service, "logs/events.jsonl", 2)
	if err != nil {
		t.Fatalf("PreviewFile() error = %v", err)
	}
	if preview.Count != 2 {
		t.Fatalf("preview.Count = %d", preview.Count)
	}

	resp, err := client.Download(context.Background(), service, "logs/events.jsonl")
	if err != nil {
		t.Fatalf("Download() error = %v", err)
	}
	defer resp.Body.Close()
	if !strings.Contains(resp.Header.Get("Content-Disposition"), "events.jsonl") {
		t.Fatalf("Content-Disposition = %q", resp.Header.Get("Content-Disposition"))
	}
}