package main

import (
	"encoding/json"
	"testing"
	"time"
)

func TestRequestMarshal(t *testing.T) {
	req := Request{Action: "list"}

	data, err := json.Marshal(req)
	if err != nil {
		t.Fatalf("marshal: %v", err)
	}

	var got Request
	if err := json.Unmarshal(data, &got); err != nil {
		t.Fatalf("unmarshal: %v", err)
	}

	if got.Action != "list" {
		t.Errorf("action = %q, want %q", got.Action, "list")
	}
}

func TestRequestMarshalWithArgs(t *testing.T) {
	args, _ := json.Marshal(LabelArgs{SessionID: "abc", Label: "review MR"})
	req := Request{Action: "label", Args: args}

	data, err := json.Marshal(req)
	if err != nil {
		t.Fatalf("marshal: %v", err)
	}

	var got Request
	if err := json.Unmarshal(data, &got); err != nil {
		t.Fatalf("unmarshal: %v", err)
	}

	if got.Action != "label" {
		t.Errorf("action = %q, want %q", got.Action, "label")
	}

	var la LabelArgs
	if err := json.Unmarshal(got.Args, &la); err != nil {
		t.Fatalf("unmarshal args: %v", err)
	}
	if la.SessionID != "abc" || la.Label != "review MR" {
		t.Errorf("args = %+v, want {abc, review MR}", la)
	}
}

func TestResponseWithSessions(t *testing.T) {
	now := time.Now()
	resp := Response{
		OK: true,
		Sessions: []SessionInfo{
			{
				PID:          1234,
				SessionID:    "sess-1",
				Cwd:          "/home/user/project",
				GitBranch:    "main",
				State:        "Working",
				Preview:      "Building...",
				Workspace:    "3",
				Label:        "feature-x",
				WaitingSince: &now,
			},
		},
	}

	data, err := json.Marshal(resp)
	if err != nil {
		t.Fatalf("marshal: %v", err)
	}

	var got Response
	if err := json.Unmarshal(data, &got); err != nil {
		t.Fatalf("unmarshal: %v", err)
	}

	if !got.OK {
		t.Error("ok = false, want true")
	}
	if len(got.Sessions) != 1 {
		t.Fatalf("sessions len = %d, want 1", len(got.Sessions))
	}

	s := got.Sessions[0]
	if s.PID != 1234 {
		t.Errorf("pid = %d, want 1234", s.PID)
	}
	if s.Workspace != "3" {
		t.Errorf("workspace = %q, want %q", s.Workspace, "3")
	}
	if s.Label != "feature-x" {
		t.Errorf("label = %q, want %q", s.Label, "feature-x")
	}
	if s.WaitingSince == nil {
		t.Error("waiting_since = nil, want non-nil")
	}
}

func TestSessionInfoWaitTypeJSON(t *testing.T) {
	// WaitType="permission" should appear in JSON
	info := SessionInfo{
		SessionID: "sess-1",
		State:     "Needs Input",
		WaitType:  "permission",
	}

	data, err := json.Marshal(info)
	if err != nil {
		t.Fatalf("marshal: %v", err)
	}

	var m map[string]interface{}
	if err := json.Unmarshal(data, &m); err != nil {
		t.Fatalf("unmarshal map: %v", err)
	}

	if wt, ok := m["wait_type"]; !ok {
		t.Error("wait_type field missing from JSON")
	} else if wt != "permission" {
		t.Errorf("wait_type = %v, want %q", wt, "permission")
	}

	// WaitType="" should be omitted (omitempty)
	info2 := SessionInfo{
		SessionID: "sess-2",
		State:     "Working",
		WaitType:  "",
	}

	data2, err := json.Marshal(info2)
	if err != nil {
		t.Fatalf("marshal: %v", err)
	}

	var m2 map[string]interface{}
	if err := json.Unmarshal(data2, &m2); err != nil {
		t.Fatalf("unmarshal map: %v", err)
	}

	if _, ok := m2["wait_type"]; ok {
		t.Error("wait_type should be omitted when empty")
	}
}