package controllers

import (
	"bytes"
	"encoding/json"
	"fmt"
	"net/http"
	"os"
	"time"

	"s-class-backend/config" // Import database

	mqtt "github.com/eclipse/paho.mqtt.golang"
	"github.com/gin-gonic/gin"
)

// --- STRUKTUR DATA REQUEST ---
type DeviceControlRequest struct {
	Device string `json:"device"`
	Action string `json:"action"`
}

type VerifyRequest struct {
	Token string `json:"token"`
}

// =========================================================================
// CACHE STATUS HARDWARE (Mengingat status terakhir perangkat untuk Web Admin)
// =========================================================================
var DeviceStatusCache = map[string]string{
	"lampu1":    "off",
	"lampu2":    "off",
	"ac":        "off",
	"projector": "off",
}

// =========================================================================
// FUNGSI 1: VERIFIKASI TOKEN (Bisa Master & Mahasiswa)
// =========================================================================
func VerifyHardwareCode(c *gin.Context) {
	var req VerifyRequest

	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Format token tidak valid"})
		return
	}

	tokenInput := req.Token
	sekarang := time.Now()
	sisaMenit := 0
	isTokenValid := false

	// =========================================================
	// 1. PENGECEKAN KELOMPOK TOKEN MASTER (Tanpa Cek Waktu)
	// =========================================================
	if tokenInput == "CS2026" {
		fmt.Printf("[VERIFY] Master Token CS digunakan\n")
		sisaMenit = 60
		isTokenValid = true
	} else if tokenInput == "ADM999" {
		fmt.Printf("[VERIFY] Master Token Admin digunakan\n")
		sisaMenit = 999
		isTokenValid = true
	} else {
		// =========================================================
		// 2. PENGECEKAN KELOMPOK TOKEN MAHASISWA (Cek Database & Waktu)
		// =========================================================
		var jamMulai time.Time
		var jamSelesai time.Time
		type ResultTime struct {
			JamMulai   time.Time `gorm:"column:start_time"`
			JamSelesai time.Time `gorm:"column:end_time"`
		}
		var result ResultTime

		// Cek Bookings
		errBooking := config.DB.Table("bookings").
			Select("start_time, end_time").
			Where("redeem_code = ?", tokenInput).
			Scan(&result).Error

		if errBooking == nil && !result.JamSelesai.IsZero() {
			jamMulai = result.JamMulai
			jamSelesai = result.JamSelesai
			isTokenValid = true
		} else {
			// Cek Jadwal Kelas Tetap
			errSchedule := config.DB.Table("class_schedules").
				Select("start_time, end_time").
				Where("kode_mk = ?", tokenInput).
				Scan(&result).Error

			if errSchedule == nil && !result.JamSelesai.IsZero() {
				jamMulai = result.JamMulai
				jamSelesai = result.JamSelesai
				isTokenValid = true
			}
		}

		if !isTokenValid {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Token salah atau tidak ditemukan"})
			return
		}

		jamMulaiHariIni := time.Date(sekarang.Year(), sekarang.Month(), sekarang.Day(),
			jamMulai.Hour(), jamMulai.Minute(), jamMulai.Second(), 0, sekarang.Location())
		jamSelesaiHariIni := time.Date(sekarang.Year(), sekarang.Month(), sekarang.Day(),
			jamSelesai.Hour(), jamSelesai.Minute(), jamSelesai.Second(), 0, sekarang.Location())

		batasMasukAwal := jamMulaiHariIni.Add(-15 * time.Minute)
		if sekarang.Before(batasMasukAwal) {
			c.JSON(http.StatusForbidden, gin.H{"error": "Jadwal kelas belum dimulai"})
			return
		}

		selisihWaktu := jamSelesaiHariIni.Sub(sekarang)
		sisaMenit = int(selisihWaktu.Minutes())

		if sisaMenit <= 0 {
			c.JSON(http.StatusForbidden, gin.H{"error": "Waktu peminjaman sudah habis"})
			return
		}
	}

	// =========================================================
	// 3. JIKA VALID (Master / Mahasiswa), BUKA GEMBOK VIA MQTT
	// =========================================================
	DeviceStatusCache["lampu1"] = "on"
	DeviceStatusCache["lampu2"] = "on"

	broker := os.Getenv("MQTT_BROKER")
	user := os.Getenv("MQTT_USER")
	pass := os.Getenv("MQTT_PASSWORD")

	opts := mqtt.NewClientOptions()
	opts.AddBroker(broker)
	opts.SetUsername(user)
	opts.SetPassword(pass)
	opts.SetClientID(fmt.Sprintf("Golang-Auth-%d", time.Now().Unix()))

	client := mqtt.NewClient(opts)
	if tokenMQTT := client.Connect(); tokenMQTT.Wait() && tokenMQTT.Error() == nil {
		// Buka Gembok Relay
		client.Publish("sclass/d101/auth", 0, true, "UNLOCK").Wait()

		// Opsional: Nyalakan Lampu Otomatis saat login
		client.Publish("sclass/d101/lampu1", 0, false, "on").Wait()
		client.Publish("sclass/d101/lampu2", 0, false, "on").Wait()

		client.Disconnect(250)
		fmt.Printf("[MQTT] Perintah UNLOCK dan ON dikirim (Sisa Menit: %d)\n", sisaMenit)
	} else {
		fmt.Printf("[MQTT ERROR] Gagal menghubungi broker: %v\n", tokenMQTT.Error())
	}

	c.JSON(http.StatusOK, gin.H{
		"status":           "success",
		"message":          "Token Valid",
		"duration_minutes": sisaMenit,
	})
}

// =========================================================================
// FUNGSI 2: KONTROL DEVICE VIA HOME ASSISTANT & MQTT
// =========================================================================
func ControlHardware(c *gin.Context) {
	var req DeviceControlRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Format data tidak valid"})
		return
	}

	// 🌟 BLOK 1: KONTROL GEMBOK / OTORISASI RELAY (SANGAT PENTING)
	if req.Device == "auth" {
		broker := os.Getenv("MQTT_BROKER")
		user := os.Getenv("MQTT_USER")
		pass := os.Getenv("MQTT_PASSWORD")

		opts := mqtt.NewClientOptions().AddBroker(broker).SetUsername(user).SetPassword(pass).SetClientID(fmt.Sprintf("Golang-Lock-%d", time.Now().Unix()))
		client := mqtt.NewClient(opts)
		if token := client.Connect(); token.Wait() && token.Error() == nil {
			// Retain = true untuk menimpa status UNLOCK lama di server MQTT
			client.Publish("sclass/d101/auth", 0, true, req.Action).Wait()
			client.Disconnect(250)
			fmt.Println("[MQTT] Status Gembok Relay diubah menjadi:", req.Action)
		} else {
			fmt.Println("[MQTT ERROR] Gagal terhubung saat mencoba mengunci relay.")
		}
		c.JSON(http.StatusOK, gin.H{"status": "success", "message": "Gembok " + req.Action})
		return
	}

	// --- BLOK 2: KONTROL LAMPU ---
	if req.Device == "lampu1" || req.Device == "lampu2" {
		broker := os.Getenv("MQTT_BROKER")
		user := os.Getenv("MQTT_USER")
		pass := os.Getenv("MQTT_PASSWORD")

		opts := mqtt.NewClientOptions()
		opts.AddBroker(broker)
		opts.SetUsername(user)
		opts.SetPassword(pass)
		opts.SetClientID(fmt.Sprintf("Golang-SCLASS-%d", time.Now().Unix()))

		client := mqtt.NewClient(opts)
		if token := client.Connect(); token.Wait() && token.Error() != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "Golang gagal terhubung ke MQTT Broker"})
			return
		}
		defer client.Disconnect(250)

		topic := fmt.Sprintf("sclass/d101/%s", req.Device)
		token := client.Publish(topic, 0, false, req.Action)
		token.Wait()

		DeviceStatusCache[req.Device] = req.Action
		c.JSON(http.StatusOK, gin.H{"status": "success", "message": fmt.Sprintf("Berhasil %s ke %s", req.Action, req.Device)})
		return
	}

	// --- BLOK 3: KONTROL AC & PROYEKTOR ---
	if req.Device == "ac" || req.Device == "projector" {
		haURL := os.Getenv("HA_URL")
		haToken := os.Getenv("HA_TOKEN")
		var entityID string

		switch req.Device {
		case "ac":
			if req.Action == "on" {
				entityID = "scene.ac_d101_on"
			} else {
				entityID = "scene.ac_d101_off"
			}
		case "projector":
			if req.Action == "on" {
				entityID = "scene.projector_d101_on"
			} else {
				entityID = "scene.projector_d101_off"
			}
		}

		apiURL := fmt.Sprintf("%s/api/services/scene/turn_on", haURL)
		payload := map[string]string{"entity_id": entityID}
		jsonPayload, _ := json.Marshal(payload)

		reqHA, err := http.NewRequest("POST", apiURL, bytes.NewBuffer(jsonPayload))
		if err == nil {
			reqHA.Header.Set("Authorization", "Bearer "+haToken)
			reqHA.Header.Set("Content-Type", "application/json")
			httpClient := &http.Client{Timeout: 5 * time.Second}
			resp, _ := httpClient.Do(reqHA)
			if resp != nil {
				resp.Body.Close()
			}
		}

		DeviceStatusCache[req.Device] = req.Action
		c.JSON(http.StatusOK, gin.H{"status": "success", "message": "Scene dipicu: " + entityID})
		return
	}

	c.JSON(http.StatusBadRequest, gin.H{"error": "Device tidak dikenali"})
}

// =========================================================================
// FUNGSI 3: MENDAPATKAN STATUS DAYA DARI HOME ASSISTANT
// =========================================================================
func GetPowerStatus(c *gin.Context) {
	haURL := os.Getenv("HA_URL")
	haToken := os.Getenv("HA_TOKEN")

	entityID := "sensor.kwh_meter_power"
	apiURL := fmt.Sprintf("%s/api/states/%s", haURL, entityID)

	req, _ := http.NewRequest("GET", apiURL, nil)
	req.Header.Set("Authorization", "Bearer "+haToken)
	req.Header.Set("Content-Type", "application/json")

	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"power": 0})
		return
	}
	defer resp.Body.Close()

	var result map[string]interface{}
	json.NewDecoder(resp.Body).Decode(&result)

	powerStr, ok := result["state"].(string)
	if !ok {
		c.JSON(http.StatusOK, gin.H{"power": 0})
		return
	}

	c.JSON(http.StatusOK, gin.H{"power": powerStr})
}

// =========================================================================
// FUNGSI 4: MENGIRIM STATUS REAL-TIME KE WEB FRONTEND
// =========================================================================
func GetHardwareStatus(c *gin.Context) {
	c.JSON(http.StatusOK, gin.H{
		"status": "success",
		"data":   DeviceStatusCache,
	})
}