/*
 * ============================================================================
 * Projekt.....: rs2322tcp
 * Datei.......: internal/gui/assignment_test.go
 * Copyright (C) 2026 Dieter Lang
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 * Beschreibung:
 * Tests für die GUI-unabhängige Aufbereitung der Zuordnung zwischen lokalen
 * virtuellen seriellen Schnittstellen und den vom rs2322tcp-Server
 * angebotenen Geräten.
 * ============================================================================
 */
package gui

import (
	"testing"

	"git.lang-dieter.de/rs2322tcp/internal/config"
	"git.lang-dieter.de/rs2322tcp/internal/transport"
)

///////////////////////////////////////////////////////////////////////////////
// Test helpers
///////////////////////////////////////////////////////////////////////////////

// testClientConfig creates a client configuration containing the supplied
// local-to-remote assignments.
func testClientConfig(
	assignments ...config.VirtualPortConfig,
) *config.ClientConfig {
	return &config.ClientConfig{
		VirtualPorts: assignments,
	}
}

// testRemoteDevices creates a list of remote devices from their IDs.
func testRemoteDevices(ids ...string) []transport.RemoteDeviceInfo {
	devices := make([]transport.RemoteDeviceInfo, 0, len(ids))

	for _, id := range ids {
		devices = append(devices, transport.RemoteDeviceInfo{
			ID:   id,
			Name: id,
		})
	}

	return devices
}

///////////////////////////////////////////////////////////////////////////////
// BuildAssignments tests
///////////////////////////////////////////////////////////////////////////////

func TestBuildAssignments(t *testing.T) {
	cfg := testClientConfig(
		config.VirtualPortConfig{
			Port:         "/dev/ttyUSB100",
			RemoteDevice: "radio",
		},
		config.VirtualPortConfig{
			Port:         "/dev/ttyUSB101",
			RemoteDevice: "rotor",
		},
	)

	devices := testRemoteDevices(
		"radio",
		"rotor",
		"gps",
	)

	assignments := BuildAssignments(cfg, devices)

	if len(assignments) != 2 {
		t.Fatalf(
			"BuildAssignments() returned %d assignments, want 2",
			len(assignments),
		)
	}

	if assignments[0].LocalPort != "/dev/ttyUSB100" {
		t.Errorf(
			"assignments[0].LocalPort = %q, want %q",
			assignments[0].LocalPort,
			"/dev/ttyUSB100",
		)
	}

	if assignments[0].RemoteDevice != "radio" {
		t.Errorf(
			"assignments[0].RemoteDevice = %q, want %q",
			assignments[0].RemoteDevice,
			"radio",
		)
	}

	if !assignments[0].Available {
		t.Error("assignments[0].Available = false, want true")
	}

	if assignments[1].LocalPort != "/dev/ttyUSB101" {
		t.Errorf(
			"assignments[1].LocalPort = %q, want %q",
			assignments[1].LocalPort,
			"/dev/ttyUSB101",
		)
	}

	if assignments[1].RemoteDevice != "rotor" {
		t.Errorf(
			"assignments[1].RemoteDevice = %q, want %q",
			assignments[1].RemoteDevice,
			"rotor",
		)
	}

	if !assignments[1].Available {
		t.Error("assignments[1].Available = false, want true")
	}
}

func TestBuildAssignmentsUnavailableDevice(t *testing.T) {
	cfg := testClientConfig(
		config.VirtualPortConfig{
			Port:         "/dev/ttyUSB100",
			RemoteDevice: "radio",
		},
		config.VirtualPortConfig{
			Port:         "/dev/ttyUSB101",
			RemoteDevice: "rotor",
		},
	)

	devices := testRemoteDevices("rotor")

	assignments := BuildAssignments(cfg, devices)

	if len(assignments) != 2 {
		t.Fatalf(
			"BuildAssignments() returned %d assignments, want 2",
			len(assignments),
		)
	}

	if assignments[0].RemoteDevice != "radio" {
		t.Errorf(
			"assignments[0].RemoteDevice = %q, want %q",
			assignments[0].RemoteDevice,
			"radio",
		)
	}

	if assignments[0].Available {
		t.Error("radio assignment marked available, want unavailable")
	}

	if assignments[1].RemoteDevice != "rotor" {
		t.Errorf(
			"assignments[1].RemoteDevice = %q, want %q",
			assignments[1].RemoteDevice,
			"rotor",
		)
	}

	if !assignments[1].Available {
		t.Error("rotor assignment marked unavailable, want available")
	}
}

func TestBuildAssignmentsNilConfig(t *testing.T) {
	devices := testRemoteDevices("radio")

	assignments := BuildAssignments(nil, devices)

	if assignments != nil {
		t.Fatalf(
			"BuildAssignments(nil, ...) = %#v, want nil",
			assignments,
		)
	}
}

func TestBuildAssignmentsEmptyConfig(t *testing.T) {
	cfg := testClientConfig()

	devices := testRemoteDevices(
		"radio",
		"rotor",
	)

	assignments := BuildAssignments(cfg, devices)

	if len(assignments) != 0 {
		t.Fatalf(
			"BuildAssignments() returned %d assignments, want 0",
			len(assignments),
		)
	}
}

///////////////////////////////////////////////////////////////////////////////
// UnassignedDevices tests
///////////////////////////////////////////////////////////////////////////////

func TestUnassignedDevices(t *testing.T) {
	cfg := testClientConfig(
		config.VirtualPortConfig{
			Port:         "/dev/ttyUSB100",
			RemoteDevice: "radio",
		},
		config.VirtualPortConfig{
			Port:         "/dev/ttyUSB101",
			RemoteDevice: "rotor",
		},
	)

	devices := testRemoteDevices(
		"radio",
		"rotor",
		"gps",
		"tnc",
	)

	unassigned := UnassignedDevices(cfg, devices)

	if len(unassigned) != 2 {
		t.Fatalf(
			"UnassignedDevices() returned %d devices, want 2",
			len(unassigned),
		)
	}

	if unassigned[0].ID != "gps" {
		t.Errorf(
			"unassigned[0].ID = %q, want %q",
			unassigned[0].ID,
			"gps",
		)
	}

	if unassigned[1].ID != "tnc" {
		t.Errorf(
			"unassigned[1].ID = %q, want %q",
			unassigned[1].ID,
			"tnc",
		)
	}
}

func TestUnassignedDevicesAllAssigned(t *testing.T) {
	cfg := testClientConfig(
		config.VirtualPortConfig{
			Port:         "/dev/ttyUSB100",
			RemoteDevice: "radio",
		},
		config.VirtualPortConfig{
			Port:         "/dev/ttyUSB101",
			RemoteDevice: "rotor",
		},
	)

	devices := testRemoteDevices(
		"radio",
		"rotor",
	)

	unassigned := UnassignedDevices(cfg, devices)

	if len(unassigned) != 0 {
		t.Fatalf(
			"UnassignedDevices() returned %d devices, want 0",
			len(unassigned),
		)
	}
}

func TestUnassignedDevicesEmptyConfig(t *testing.T) {
	cfg := testClientConfig()

	devices := testRemoteDevices(
		"radio",
		"rotor",
	)

	unassigned := UnassignedDevices(cfg, devices)

	if len(unassigned) != 2 {
		t.Fatalf(
			"UnassignedDevices() returned %d devices, want 2",
			len(unassigned),
		)
	}
}

func TestUnassignedDevicesNilConfig(t *testing.T) {
	devices := testRemoteDevices(
		"radio",
		"rotor",
	)

	unassigned := UnassignedDevices(nil, devices)

	if len(unassigned) != 2 {
		t.Fatalf(
			"UnassignedDevices(nil, ...) returned %d devices, want 2",
			len(unassigned),
		)
	}
}

func TestUnassignedDevicesEmptyServerList(t *testing.T) {
	cfg := testClientConfig(
		config.VirtualPortConfig{
			Port:         "/dev/ttyUSB100",
			RemoteDevice: "radio",
		},
	)

	unassigned := UnassignedDevices(cfg, nil)

	if len(unassigned) != 0 {
		t.Fatalf(
			"UnassignedDevices() returned %d devices, want 0",
			len(unassigned),
		)
	}
}

///////////////////////////////////////////////////////////////////////////////
// Existing configuration does not change
///////////////////////////////////////////////////////////////////////////////

func TestAssignmentFunctionsDoNotModifyConfig(t *testing.T) {
	cfg := testClientConfig(
		config.VirtualPortConfig{
			Port:         "/dev/ttyUSB100",
			RemoteDevice: "radio",
		},
	)

	devices := testRemoteDevices(
		"radio",
		"rotor",
		"gps",
	)

	_ = BuildAssignments(cfg, devices)
	_ = UnassignedDevices(cfg, devices)

	if len(cfg.VirtualPorts) != 1 {
		t.Fatalf(
			"configuration contains %d virtual ports, want 1",
			len(cfg.VirtualPorts),
		)
	}

	if cfg.VirtualPorts[0].Port != "/dev/ttyUSB100" {
		t.Errorf(
			"configuration port = %q, want %q",
			cfg.VirtualPorts[0].Port,
			"/dev/ttyUSB100",
		)
	}

	if cfg.VirtualPorts[0].RemoteDevice != "radio" {
		t.Errorf(
			"configuration remote device = %q, want %q",
			cfg.VirtualPorts[0].RemoteDevice,
			"radio",
		)
	}
}