package notifier

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

	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"gorm.io/datatypes"

	"rocketgit.ru/rsmon/worker/app/models"
	"rocketgit.ru/rsmon/worker/config/database"
)

func init() {
	database.Init()
}

// TestContactKindToMethod is the table that drives producer + selector +
// executor dispatch.
func TestContactKindToMethod(t *testing.T) {
	cases := map[string]string{
		"email":            "email",
		"telegram_private": "telegram",
		"telegram_group":   "telegram",
		"webhook":          "webhook",
		"mattermost":       "mattermost",
		"sms":              "sms",
		"voice":            "voice",
		"":                 "",
		"unknown":          "",
	}
	for in, want := range cases {
		assert.Equal(t, want, ContactKindToMethod(in), "kind=%q", in)
	}
}

// TestEnqueueNotificationTaskFromMessage_SeedsTaskWithPreRenderedBody
// exercises the producer end-to-end against the test DB. It seeds an account,
// notification, contact, and event; calls EnqueueNotificationTaskFromMessage;
// and checks the resulting Task row has the pre-rendered subject/body in the
// payload (i.e. the worker does not need to know templating).
func TestEnqueueNotificationTaskFromMessage_SeedsTaskWithPreRenderedBody(t *testing.T) {
	models.Drop()
	models.Migrate()
	models.DB().Exec(
		"INSERT INTO regions (code, name, enabled, created_at, updated_at) VALUES (?, ?, true, now(), now())",
		"test", "test",
	)

	plan := models.Plan{Name: "producer-test"}
	require.NoError(t, models.DB().Create(&plan).Error)
	user := models.User{Name: "u", Email: producerStringPtr("u@example.com"), Timezone: "UTC"}
	require.NoError(t, models.DB().Create(&user).Error)
	account := models.Account{Name: "a", Timezone: "UTC", Language: "en", PlanID: &plan.ID}
	require.NoError(t, models.DB().Create(&account).Error)

	group := models.Group{Name: "g", AccountID: account.ID}
	require.NoError(t, models.DB().Create(&group).Error)

	monitor := models.Monitor{
		Name:    producerStringPtr("m"),
		Host:    "example.com",
		GroupID: group.ID,
		Enabled: true,
	}
	require.NoError(t, models.DB().Create(&monitor).Error)

	notification := models.Notification{
		Name: "default", AccountID: account.ID, Enabled: true,
		NotifyDown: true, NotifyRestore: true,
	}
	require.NoError(t, models.DB().Create(&notification).Error)

	contact := models.Contact{Name: "ops", Kind: "email", Value: "ops@example.com", AccountID: &account.ID}
	require.NoError(t, models.DB().Create(&contact).Error)

	start := time.Now().Add(-time.Minute)
	event := models.Event{
		MonitorID: monitor.ID,
		StartTime: &start,
		State:     "current",
		Errors:    5,
	}
	require.NoError(t, models.DB().Create(&event).Error)

	msg := models.Message{
		NotificationID: notification.ID,
		ContactID:      contact.ID,
		Events:         []models.Event{event},
		Kind:           "down",
		State:          "queued",
	}
	require.NoError(t, models.DB().Create(&msg).Error)

	w := &models.WorkerNode{
		WorkerID:    "worker-producer",
		RegionCode:  "test",
		Status:      "active",
		AuthToken:   "tok",
		Concurrency: 4,
		LastSeen:    producerTimePtr(time.Now()),
		Capabilities: datatypes.JSON([]byte(
			`{"check_types":["http"],"task_envelope":true,"notification_methods":["email"],"notification_accounts":[]}`,
		)),
	}
	require.NoError(t, models.DB().Create(w).Error)

	// Load the message back with the scope GetContent expects (Monitor + Group
	// + Notification preloaded). The sender's GetContent panics on nil fields.
	loaded := models.Message{}
	require.NoError(t, models.MessageScope(models.DB()).First(&loaded, msg.ID).Error)
	require.Len(t, loaded.Events, 1)
	require.NotNil(t, loaded.Events[0].Monitor)

	row, err := EnqueueNotificationTaskFromMessage(&notification, &contact, &loaded)
	require.NoError(t, err)
	require.NotNil(t, row, "expected a Task row from the producer")
	assert.Equal(t, models.TaskKindNotification, row.Kind)
	assert.Equal(t, models.TaskStateQueued, row.State)
	assert.NotEmpty(t, row.Payload)
	assert.Equal(t, account.ID, row.AccountID)
	assert.Equal(t, &contact.ID, row.ContactID)
	require.NotNil(t, row.MessageID)
	assert.Equal(t, loaded.ID, *row.MessageID)
	assert.Equal(t, models.NotificationIdempotencyKey(notification.ID, contact.ID, event.ID), row.IdempotencyKey)

	var payload map[string]interface{}
	require.NoError(t, json.Unmarshal(row.Payload, &payload))
	assert.Equal(t, "email", payload["method"])
	assert.Equal(t, "down", payload["message_kind"])
	assert.NotEmpty(t, payload["subject"])
}

// TestEnqueueNotificationTaskFromMessage_Idempotent exercises the producer's
// idempotency contract: a second call with the same (notification, contact,
// event) tuple must not create a second Task row.
func TestEnqueueNotificationTaskFromMessage_Idempotent(t *testing.T) {
	models.Drop()
	models.Migrate()
	models.DB().Exec(
		"INSERT INTO regions (code, name, enabled, created_at, updated_at) VALUES (?, ?, true, now(), now())",
		"test", "test",
	)
	plan := models.Plan{Name: "p"}
	require.NoError(t, models.DB().Create(&plan).Error)
	user := models.User{Name: "u", Email: producerStringPtr("u@example.com"), Timezone: "UTC"}
	require.NoError(t, models.DB().Create(&user).Error)
	account := models.Account{Name: "a", Timezone: "UTC", Language: "en", PlanID: &plan.ID}
	require.NoError(t, models.DB().Create(&account).Error)
	group := models.Group{Name: "g", AccountID: account.ID}
	require.NoError(t, models.DB().Create(&group).Error)
	monitor := models.Monitor{
		Name:    producerStringPtr("m"),
		Host:    "example.com",
		GroupID: group.ID,
		Enabled: true,
	}
	require.NoError(t, models.DB().Create(&monitor).Error)
	notification := models.Notification{
		Name: "default", AccountID: account.ID, Enabled: true,
		NotifyDown: true, NotifyRestore: true,
	}
	require.NoError(t, models.DB().Create(&notification).Error)
	contact := models.Contact{Name: "ops", Kind: "email", Value: "ops@example.com", AccountID: &account.ID}
	require.NoError(t, models.DB().Create(&contact).Error)
	start := time.Now().Add(-time.Minute)
	event := models.Event{MonitorID: monitor.ID, StartTime: &start, State: "current", Errors: 5}
	require.NoError(t, models.DB().Create(&event).Error)

	w := &models.WorkerNode{
		WorkerID:    "worker-idem",
		RegionCode:  "test",
		Status:      "active",
		AuthToken:   "tok",
		Concurrency: 4,
		LastSeen:    producerTimePtr(time.Now()),
		Capabilities: datatypes.JSON([]byte(
			`{"check_types":["http"],"task_envelope":true,"notification_methods":["email"],"notification_accounts":[]}`,
		)),
	}
	require.NoError(t, models.DB().Create(w).Error)

	msg := models.Message{
		NotificationID: notification.ID,
		ContactID:      contact.ID,
		Events:         []models.Event{event},
		Kind:           "down",
		State:          "queued",
	}
	require.NoError(t, models.DB().Create(&msg).Error)

	loaded := models.Message{}
	require.NoError(t, models.MessageScope(models.DB()).First(&loaded, msg.ID).Error)

	first, err := EnqueueNotificationTaskFromMessage(&notification, &contact, &loaded)
	require.NoError(t, err)
	require.NotNil(t, first)

	second, err := EnqueueNotificationTaskFromMessage(&notification, &contact, &loaded)
	require.NoError(t, err)
	require.NotNil(t, second)
	assert.Equal(t, first.ID, second.ID, "second producer call must reuse the first task row")

	var count int64
	require.NoError(t, models.DB().Model(&models.Task{}).
		Where("idempotency_key = ?", first.IdempotencyKey).
		Count(&count).Error)
	assert.EqualValues(t, 1, count)
}

func producerStringPtr(s string) *string { return &s }

func producerTimePtr(value time.Time) *time.Time { return &value }

// guard against uuid being accidentally dropped from the imports.
var _ = uuid.New