package httpapi

import (
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"testing"

	"rk3588sys/agent/internal/config"
	"rk3588sys/agent/internal/procctl"
)

type fakeProcessController struct {
	status procctl.Status
}

func (f fakeProcessController) Enabled() bool { return true }
func (f fakeProcessController) Status() (procctl.Status, error) {
	return f.status, nil
}
func (f fakeProcessController) Version() (string, error) { return "", procctl.ErrNotSupported }
func (f fakeProcessController) Start(string) (procctl.Status, error) {
	return procctl.Status{}, procctl.ErrNotSupported
}
func (f fakeProcessController) Stop() (procctl.Status, error) {
	return procctl.Status{}, procctl.ErrNotSupported
}
func (f fakeProcessController) Restart(string) (procctl.Status, error) {
	return procctl.Status{}, procctl.ErrNotSupported
}
func (f fakeProcessController) BinaryInfo() (procctl.BinaryUpdateResult, error) {
	return procctl.BinaryUpdateResult{}, procctl.ErrNotSupported
}
func (f fakeProcessController) UpdateBinary(io.Reader, int64, string) (procctl.BinaryUpdateResult, error) {
	return procctl.BinaryUpdateResult{}, procctl.ErrNotSupported
}
func (f fakeProcessController) RollbackBinary(string) (procctl.BinaryUpdateResult, error) {
	return procctl.BinaryUpdateResult{}, procctl.ErrNotSupported
}

func TestHandleConfigStatusReportsMetadataHashAndMediaStatus(t *testing.T) {
	dir := t.TempDir()
	cfgPath := filepath.Join(dir, "config.json")
	body := []byte(`{"metadata":{"config_id":"cfg-1","config_version":"v1"},"instances":[]}`)
	if err := os.WriteFile(cfgPath, body, 0o644); err != nil {
		t.Fatalf("write config: %v", err)
	}
	if err := os.WriteFile(cfgPath+".last_good.json", []byte(`{"metadata":{"config_id":"cfg-0"}}`), 0o644); err != nil {
		t.Fatalf("write last good: %v", err)
	}

	s := &Server{
		agentCfg: config.AgentConfig{ConfigPath: cfgPath},
		proc: fakeProcessController{status: procctl.Status{
			Running:     true,
			Pid:         1234,
			ConfigPath:  cfgPath,
			StartedAtMS: 1000,
		}},
	}

	req := httptest.NewRequest(http.MethodGet, "/v1/config/status", nil)
	rr := httptest.NewRecorder()
	s.handleConfigStatus(rr, req)

	if rr.Code != http.StatusOK {
		t.Fatalf("status code: got %d body=%s", rr.Code, rr.Body.String())
	}
	var got map[string]any
	if err := json.Unmarshal(rr.Body.Bytes(), &got); err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if got["exists"] != true {
		t.Fatalf("exists = %v", got["exists"])
	}
	metadata, ok := got["metadata"].(map[string]any)
	if !ok {
		t.Fatalf("metadata missing or wrong type: %#v", got["metadata"])
	}
	if metadata["config_id"] != "cfg-1" || metadata["config_version"] != "v1" {
		t.Fatalf("metadata = %#v", metadata)
	}
	sum := sha256.Sum256(body)
	wantSHA := hex.EncodeToString(sum[:])
	if got["sha256"] != wantSHA {
		t.Fatalf("sha256 = %v want %s", got["sha256"], wantSHA)
	}
	media, ok := got["media_server"].(map[string]any)
	if !ok || media["running"] != true || media["pid"] != float64(1234) {
		t.Fatalf("media_server = %#v", got["media_server"])
	}
	previousConfig, ok := got["previous_config"].(map[string]any)
	if !ok || previousConfig["exists"] != true {
		t.Fatalf("previous_config = %#v", got["previous_config"])
	}
	if got["previous_config_path"] != filepath.ToSlash(cfgPath+".last_good.json") {
		t.Fatalf("previous_config_path = %#v", got["previous_config_path"])
	}
}