package handlers

import (
	"net/http"
	"strconv"
	"strings"

	"lostcavewireplanner/internal/models"
)

type RackViewData struct {
	Rack            models.Rack
	FrontSlots      []RackSlot
	BackSlots       []RackSlot
	RackedDevices   []models.Device
	UnrackedDevices []models.Device
	Connections     []models.Connection
	ConnectionTypes []models.ConnectionType
	AllDevices      []models.Device
	WallSocketModels []models.DeviceModel
	Error           string
}

type RackSlot struct {
	Unit    int
	Device  *models.Device
	Height  int
	IsStart bool
}

func (h *Handlers) RackView(w http.ResponseWriter, r *http.Request) {
	idStr := r.PathValue("id")
	id, err := strconv.ParseInt(idStr, 10, 64)
	if err != nil {
		http.NotFound(w, r)
		return
	}

	rack, err := h.Store.RackGetByID(id)
	if err != nil || rack == nil {
		http.NotFound(w, r)
		return
	}

	rackedDevices, _ := h.Store.DeviceGetByRackID(id)
	unrackedDevices, _ := h.Store.DeviceGetUnrackedByRackID(id)
	connections, _ := h.Store.ConnectionGetAllForRack(id)
	connTypes, _ := h.Store.ConnectionTypeGetAll()
	allDevices, _ := h.Store.DeviceGetAllUnracked()

	if rackedDevices == nil {
		rackedDevices = []models.Device{}
	}
	if unrackedDevices == nil {
		unrackedDevices = []models.Device{}
	}
	if connections == nil {
		connections = []models.Connection{}
	}
	if connTypes == nil {
		connTypes = []models.ConnectionType{}
	}
	if allDevices == nil {
		allDevices = []models.Device{}
	}

	frontSlots, backSlots := buildRackSlots(rack.HeightUnits, rackedDevices)

	h.render(w, "rack.html", RackViewData{
		Rack:            *rack,
		FrontSlots:      frontSlots,
		BackSlots:       backSlots,
		RackedDevices:   rackedDevices,
		UnrackedDevices: unrackedDevices,
		Connections:     connections,
		ConnectionTypes: connTypes,
		AllDevices:      allDevices,
	})
}

func buildRackSlots(heightUnits int, devices []models.Device) (front, back []RackSlot) {
	front = make([]RackSlot, heightUnits)
	back = make([]RackSlot, heightUnits)
	for i := range front {
		front[i].Unit = i + 1
		back[i].Unit = i + 1
	}

	for _, d := range devices {
		if d.RackUnitStart == nil || d.RackSide == nil {
			continue
		}
		height := 1
		if d.Model != nil && d.Model.HeightUnits != nil {
			height = *d.Model.HeightUnits
		}
		start := *d.RackUnitStart - 1
		if start < 0 || start >= heightUnits {
			continue
		}
		end := start + height
		if end > heightUnits {
			end = heightUnits
		}

		slots := &front
		if *d.RackSide == "back" {
			slots = &back
		}

		for u := start; u < end; u++ {
			(*slots)[u].Device = &d
			(*slots)[u].Height = height
			(*slots)[u].IsStart = (u == start)
		}
	}
	return
}

func (h *Handlers) RackDelete(w http.ResponseWriter, r *http.Request) {
	idStr := r.PathValue("id")
	id, _ := strconv.ParseInt(idStr, 10, 64)
	h.Store.RackDelete(id)
	h.redirect(w, r, "/")
}

func (h *Handlers) RackEdit(w http.ResponseWriter, r *http.Request) {
	idStr := r.PathValue("id")
	id, _ := strconv.ParseInt(idStr, 10, 64)
	r.ParseForm()

	rack, err := h.Store.RackGetByID(id)
	if err != nil || rack == nil {
		http.NotFound(w, r)
		return
	}

	rack.Name = r.FormValue("name")
	rack.RackType = r.FormValue("rack_type")
	rack.Depth = r.FormValue("depth")
	if hu := r.FormValue("height_units"); hu != "" {
		if n, err := strconv.Atoi(hu); err == nil {
			rack.HeightUnits = n
		}
	}
	rack.Comment = r.FormValue("comment")

	if err := h.Store.RackUpdate(rack); err != nil {
		h.renderRackError(w, *rack, "Failed to update: "+err.Error())
		return
	}
	h.redirect(w, r, "/racks/"+idStr)
}

func (h *Handlers) RackAddRackedDevice(w http.ResponseWriter, r *http.Request) {
	idStr := r.PathValue("id")
	rackID, _ := strconv.ParseInt(idStr, 10, 64)
	r.ParseForm()

	deviceIDStr := r.FormValue("device_id")
	deviceID, _ := strconv.ParseInt(deviceIDStr, 10, 64)
	unitStartStr := r.FormValue("rack_unit_start")
	unitStart, _ := strconv.Atoi(unitStartStr)
	rackSide := r.FormValue("rack_side")

	device, err := h.Store.DeviceGetByID(deviceID)
	if err != nil || device == nil {
		h.redirect(w, r, "/racks/"+idStr)
		return
	}

	device.RackID = &rackID
	device.RackUnitStart = &unitStart
	device.RackSide = &rackSide

	if err := h.Store.DeviceUpdate(device); err != nil {
		h.redirect(w, r, "/racks/"+idStr)
		return
	}
	h.redirect(w, r, "/racks/"+idStr)
}

func (h *Handlers) RackAddUnrackedDevice(w http.ResponseWriter, r *http.Request) {
	idStr := r.PathValue("id")
	rackID, _ := strconv.ParseInt(idStr, 10, 64)
	r.ParseForm()

	deviceIDStr := r.FormValue("device_id")
	deviceID, _ := strconv.ParseInt(deviceIDStr, 10, 64)

	device, err := h.Store.DeviceGetByID(deviceID)
	if err != nil || device == nil {
		h.redirect(w, r, "/racks/"+idStr)
		return
	}

	device.RackID = &rackID
	device.RackUnitStart = nil
	device.RackSide = nil

	if err := h.Store.DeviceUpdate(device); err != nil {
		h.redirect(w, r, "/racks/"+idStr)
		return
	}
	h.redirect(w, r, "/racks/"+idStr)
}

func (h *Handlers) RackRemoveDevice(w http.ResponseWriter, r *http.Request) {
	idStr := r.PathValue("id")
	devIDStr := r.PathValue("devId")
	rackID, _ := strconv.ParseInt(idStr, 10, 64)
	devID, _ := strconv.ParseInt(devIDStr, 10, 64)

	device, err := h.Store.DeviceGetByID(devID)
	if err != nil || device == nil {
		h.redirect(w, r, "/racks/"+strconv.FormatInt(rackID, 10))
		return
	}

	device.RackID = nil
	device.RackUnitStart = nil
	device.RackSide = nil
	h.Store.DeviceUpdate(device)
	h.redirect(w, r, "/racks/"+idStr)
}

func (h *Handlers) renderRackError(w http.ResponseWriter, rack models.Rack, errMsg string) {
	rackedDevices, _ := h.Store.DeviceGetByRackID(rack.ID)
	unrackedDevices, _ := h.Store.DeviceGetUnrackedByRackID(rack.ID)
	connections, _ := h.Store.ConnectionGetAllForRack(rack.ID)
	connTypes, _ := h.Store.ConnectionTypeGetAll()
	allDevices, _ := h.Store.DeviceGetAllUnracked()

	if rackedDevices == nil {
		rackedDevices = []models.Device{}
	}
	if unrackedDevices == nil {
		unrackedDevices = []models.Device{}
	}
	if connections == nil {
		connections = []models.Connection{}
	}
	if connTypes == nil {
		connTypes = []models.ConnectionType{}
	}

	frontSlots, backSlots := buildRackSlots(rack.HeightUnits, rackedDevices)

	h.render(w, "rack.html", RackViewData{
		Rack:            rack,
		FrontSlots:      frontSlots,
		BackSlots:       backSlots,
		RackedDevices:   rackedDevices,
		UnrackedDevices: unrackedDevices,
		Connections:     connections,
		ConnectionTypes: connTypes,
		AllDevices:      allDevices,
		Error:           errMsg,
	})
}

func formatPortName(name string) string {
	parts := strings.Split(name, "-")
	if len(parts) > 0 {
		return parts[len(parts)-1]
	}
	return name
}