package device

import (
	"errors"
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"

	"onixbyte.com/pipely/internal/database"
	"onixbyte.com/pipely/internal/model"
)

type Handler struct {
	db *gorm.DB
}

func NewHandler(db *gorm.DB) *Handler {
	return &Handler{db: db}
}

func (h *Handler) Register(c *gin.Context) {
	var req model.RegisterDeviceRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	device := &model.Device{
		DeviceID:       req.DeviceID,
		IPAddress:      req.IPAddress,
		Hostname:       req.Hostname,
		OS:             req.OS,
		CurrentVersion: req.CurrentVersion,
		Status:         model.DeviceStatusOnline,
		GroupName:      req.GroupName,
	}
	if device.GroupName == "" {
		device.GroupName = "default"
	}

	if err := database.UpsertDevice(h.db, device); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, device)
}

func (h *Handler) Heartbeat(c *gin.Context) {
	var req model.HeartbeatRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	status := req.Status
	if status == "" {
		status = model.DeviceStatusOnline
	}

	if err := database.UpdateDeviceHeartbeat(h.db, req.DeviceID, req.CurrentVersion, status); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"status": "acknowledged"})
}

func (h *Handler) CheckUpdate(c *gin.Context) {
	deviceID := c.Query("deviceId")
	if deviceID == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "deviceId is required"})
		return
	}

	_, artefact, err := database.GetActiveDeploymentForDevice(h.db, deviceID)
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			c.JSON(http.StatusOK, model.CheckUpdateResponse{HasUpdate: false})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, model.CheckUpdateResponse{
		HasUpdate:   true,
		ArtefactID:  artefact.ID,
		Version:     artefact.Version,
		FileSize:    artefact.FileSize,
		SHA256Hash:  artefact.SHA256Hash,
		DownloadURL: "/api/v1/packages/download/" + strconv.FormatInt(artefact.ID, 10),
	})
}

func (h *Handler) List(c *gin.Context) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("pageSize", "20"))
	status := c.Query("status")
	group := c.Query("group")

	if page < 1 {
		page = 1
	}
	if pageSize < 1 || pageSize > 100 {
		pageSize = 20
	}

	devices, total, err := database.ListDevices(h.db, status, group, page, pageSize)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, model.PaginatedResponse{
		Data:     devices,
		Total:    total,
		Page:     page,
		PageSize: pageSize,
	})
}

func (h *Handler) Get(c *gin.Context) {
	deviceID := c.Param("deviceId")
	device, err := database.GetDeviceByID(h.db, deviceID)
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			c.JSON(http.StatusNotFound, gin.H{"error": "Device not found"})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, device)
}