package iot

import (
	"context"
	"strings"
	"testing"
	"time"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/bus"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/config"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/urgency"
)

// captureUpdates 订阅 DeviceUpdateSubject 并把收到的载荷送进返回的通道。
func captureUpdates(t *testing.T, m *Manager) <-chan DeviceUpdate {
	t.Helper()
	ch := make(chan DeviceUpdate, 8)
	unsub, err := m.Bus().Subscribe(context.Background(), DeviceUpdateSubject, func(_ context.Context, e bus.Event) error {
		if d, ok := e.Payload.(DeviceUpdate); ok {
			ch <- d
		}
		return nil
	})
	if err != nil {
		t.Fatalf("Subscribe: %v", err)
	}
	t.Cleanup(unsub)
	return ch
}

// TestControl_UnlockIsCriticalSafetyEvent 验证门锁开启被标成安全域：
// 这是 IoT 侧唯一的严重度升级出处，也是 quiet hours 豁免的生产端。
func TestControl_UnlockIsCriticalSafetyEvent(t *testing.T) {
	t.Parallel()
	m, err := New(config.IoTConfig{Provider: "mock"}, nil)
	if err != nil {
		t.Fatalf("New: %v", err)
	}
	updates := captureUpdates(t, m)

	if _, err := m.Control(context.Background(), "lock.front", "unlock", nil); err != nil {
		t.Fatalf("Control: %v", err)
	}
	got := recvIoT(t, updates, 2*time.Second)
	if got.Severity != SeverityCritical {
		t.Fatalf("Severity = %v, want %v (an unlocked door is a safety event)", got.Severity, SeverityCritical)
	}
	if !strings.Contains(got.Message, "安全域") {
		t.Fatalf("Message = %q, want it to name the safety domain", got.Message)
	}
}

// TestControl_RoutineStaysRoutine 是保守默认的反面断言：常规设备变化（以及
// 锁门这类非安全域动作）绝不被升级——安静时段照旧扣下它们。
func TestControl_RoutineStaysRoutine(t *testing.T) {
	t.Parallel()
	cases := []struct {
		name   string
		device string
		action string
	}{
		{name: "开灯", device: "light.living", action: "on"},
		{name: "空调设定温度", device: "ac.living", action: "set_temperature"},
		{name: "锁门", device: "lock.front", action: "lock"},
	}
	for _, tc := range cases {
		tc := tc
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			m, err := New(config.IoTConfig{Provider: "mock"}, nil)
			if err != nil {
				t.Fatalf("New: %v", err)
			}
			updates := captureUpdates(t, m)
			params := map[string]any{"temperature": 25}
			if _, err := m.Control(context.Background(), tc.device, tc.action, params); err != nil {
				t.Fatalf("Control: %v", err)
			}
			got := recvIoT(t, updates, 2*time.Second)
			if got.Severity != SeverityRoutine {
				t.Fatalf("Severity = %v, want %v (routine transitions must stay routine)", got.Severity, SeverityRoutine)
			}
			if strings.Contains(got.Message, "安全域") {
				t.Fatalf("Message = %q, want no safety-domain wording", got.Message)
			}
		})
	}
}

// TestAlertSeverity_String 验证严重度标签经通用词汇转发（日志与记录依赖它），
// 且 IoT 侧的类型就是通用紧急度的别名 —— 它没有自己的专有严重度体系。
func TestAlertSeverity_String(t *testing.T) {
	t.Parallel()
	cases := []AlertSeverity{SeverityRoutine, SeverityWarning, SeverityCritical, AlertSeverity(7)}
	for _, in := range cases {
		if got, want := in.String(), urgency.Level(int(in)).String(); got != want {
			t.Fatalf("AlertSeverity(%d).String() = %q, want the generic label %q", int(in), got, want)
		}
	}
	if got := SeverityCritical.String(); got != "critical" {
		t.Fatalf("SeverityCritical.String() = %q, want %q", got, "critical")
	}
}

// TestDeviceUpdate_DeclaresUrgencyOnGenericChannel 钉住 IoT 走的是**通用**通道：
// 设备跃迁载荷实现 urgency.Declarer，backthink 因此不必认识 IoT 的专有字段；
// 未标注严重度的跃迁声明零值 routine（默认保守）。
func TestDeviceUpdate_DeclaresUrgencyOnGenericChannel(t *testing.T) {
	t.Parallel()
	var declared urgency.Declarer = DeviceUpdate{Severity: SeverityCritical}
	if got := declared.Urgency(); got != urgency.LevelCritical {
		t.Fatalf("DeviceUpdate.Urgency() = %v, want %v", got, urgency.LevelCritical)
	}
	if got := (DeviceUpdate{}).Urgency(); got != urgency.LevelRoutine {
		t.Fatalf("unlabelled DeviceUpdate.Urgency() = %v, want %v", got, urgency.LevelRoutine)
	}
}

// TestSafetySeverity_RuleTable 直接钉住规则表：未登记的设备类型与动作一律不升级。
func TestSafetySeverity_RuleTable(t *testing.T) {
	t.Parallel()
	cases := []struct {
		name       string
		deviceType string
		action     string
		wantSev    AlertSeverity
		wantHit    bool
	}{
		{name: "门锁开启_命中", deviceType: "lock", action: "unlock", wantSev: SeverityCritical, wantHit: true},
		{name: "门锁锁闭_不命中", deviceType: "lock", action: "lock", wantSev: SeverityRoutine, wantHit: false},
		{name: "门锁翻转_不命中", deviceType: "lock", action: "toggle", wantSev: SeverityRoutine, wantHit: false},
		{name: "灯_不命中", deviceType: "light", action: "on", wantSev: SeverityRoutine, wantHit: false},
		{name: "传感器_不命中", deviceType: "sensor", action: "unlock", wantSev: SeverityRoutine, wantHit: false},
	}
	for _, tc := range cases {
		tc := tc
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			sev, hit := safetySeverity(tc.deviceType, tc.action)
			if hit != tc.wantHit || sev != tc.wantSev {
				t.Fatalf("safetySeverity(%q, %q) = (%v, %v), want (%v, %v)",
					tc.deviceType, tc.action, sev, hit, tc.wantSev, tc.wantHit)
			}
		})
	}
}