package httpapp

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"strconv"

	"gitea.avt.data-center.id/othman.suseno/atlas/internal/errors"
)

// VTL API Handlers

// handleGetVTLStatus returns the overall VTL system status
func (a *App) handleGetVTLStatus(w http.ResponseWriter, r *http.Request) {
	status, err := a.vtlService.GetStatus()
	if err != nil {
		log.Printf("get VTL status error: %v", err)
		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to get VTL status: %v", err)))
		return
	}

	writeJSON(w, http.StatusOK, status)
}

// handleListVTLDrives returns all virtual tape drives
func (a *App) handleListVTLDrives(w http.ResponseWriter, r *http.Request) {
	drives, err := a.vtlService.ListDrives()
	if err != nil {
		log.Printf("list VTL drives error: %v", err)
		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to list VTL drives: %v", err)))
		return
	}

	writeJSON(w, http.StatusOK, drives)
}

// handleListVTLTapes returns all virtual tapes
func (a *App) handleListVTLTapes(w http.ResponseWriter, r *http.Request) {
	tapes, err := a.vtlService.ListTapes()
	if err != nil {
		log.Printf("list VTL tapes error: %v", err)
		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to list VTL tapes: %v", err)))
		return
	}

	writeJSON(w, http.StatusOK, tapes)
}

// handleCreateVTLTape creates a new virtual tape
func (a *App) handleCreateVTLTape(w http.ResponseWriter, r *http.Request) {
	var req struct {
		Barcode   string `json:"barcode"`
		Type      string `json:"type"`       // e.g., "LTO-5", "LTO-6"
		Size      uint64 `json:"size"`       // Size in bytes (0 = default, will use generation-based size)
		LibraryID int    `json:"library_id"` // Library ID where tape will be placed
		SlotID    int    `json:"slot_id"`    // Slot ID in library where tape will be placed
	}

	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, errors.ErrValidation(fmt.Sprintf("invalid request body: %v", err)))
		return
	}

	if req.Barcode == "" {
		writeError(w, errors.ErrValidation("barcode is required"))
		return
	}

	if req.LibraryID <= 0 {
		writeError(w, errors.ErrValidation("library_id is required and must be greater than 0"))
		return
	}

	if req.SlotID <= 0 {
		writeError(w, errors.ErrValidation("slot_id is required and must be greater than 0"))
		return
	}

	if req.Type == "" {
		// Will be determined from barcode suffix if not provided
		req.Type = ""
	}

	if err := a.vtlService.CreateTape(req.Barcode, req.Type, req.Size, req.LibraryID, req.SlotID); err != nil {
		log.Printf("create VTL tape error: %v", err)
		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to create VTL tape: %v", err)))
		return
	}

	writeJSON(w, http.StatusCreated, map[string]string{
		"message": "Virtual tape created successfully",
		"barcode": req.Barcode,
	})
}

// handleDeleteVTLTape deletes a virtual tape
func (a *App) handleDeleteVTLTape(w http.ResponseWriter, r *http.Request) {
	barcode := pathParam(r, "barcode")
	if barcode == "" {
		writeError(w, errors.ErrValidation("barcode is required"))
		return
	}

	if err := a.vtlService.DeleteTape(barcode); err != nil {
		log.Printf("delete VTL tape error: %v", err)
		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to delete VTL tape: %v", err)))
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{
		"message": "Virtual tape deleted successfully",
		"barcode": barcode,
	})
}

// handleVTLServiceControl controls the mhvtl service (start/stop/restart)
func (a *App) handleVTLServiceControl(w http.ResponseWriter, r *http.Request) {
	var req struct {
		Action string `json:"action"` // "start", "stop", "restart"
	}

	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, errors.ErrValidation(fmt.Sprintf("invalid request body: %v", err)))
		return
	}

	var err error
	switch req.Action {
	case "start":
		err = a.vtlService.StartService()
	case "stop":
		err = a.vtlService.StopService()
	case "restart":
		err = a.vtlService.RestartService()
	default:
		writeError(w, errors.ErrValidation("invalid action: must be 'start', 'stop', or 'restart'"))
		return
	}

	if err != nil {
		log.Printf("VTL service control error: %v", err)
		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to %s VTL service: %v", req.Action, err)))
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{
		"message": "VTL service " + req.Action + "ed successfully",
		"action":  req.Action,
	})
}

// handleGetVTLDrive returns a specific drive by ID
func (a *App) handleGetVTLDrive(w http.ResponseWriter, r *http.Request) {
	driveIDStr := pathParam(r, "id")
	driveID, err := strconv.Atoi(driveIDStr)
	if err != nil {
		writeError(w, errors.ErrValidation(fmt.Sprintf("invalid drive ID: %v", err)))
		return
	}

	drives, err := a.vtlService.ListDrives()
	if err != nil {
		log.Printf("list VTL drives error: %v", err)
		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to list VTL drives: %v", err)))
		return
	}

	for _, drive := range drives {
		if drive.ID == driveID {
			writeJSON(w, http.StatusOK, drive)
			return
		}
	}

	writeError(w, errors.ErrNotFound("drive not found"))
}

// handleGetVTLTape returns a specific tape by barcode
func (a *App) handleGetVTLTape(w http.ResponseWriter, r *http.Request) {
	barcode := pathParam(r, "barcode")
	if barcode == "" {
		writeError(w, errors.ErrValidation("barcode is required"))
		return
	}

	tapes, err := a.vtlService.ListTapes()
	if err != nil {
		log.Printf("list VTL tapes error: %v", err)
		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to list VTL tapes: %v", err)))
		return
	}

	for _, tape := range tapes {
		if tape.Barcode == barcode {
			writeJSON(w, http.StatusOK, tape)
			return
		}
	}

	writeError(w, errors.ErrNotFound("tape not found"))
}

// handleListVTLMediaChangers returns all media changers
func (a *App) handleListVTLMediaChangers(w http.ResponseWriter, r *http.Request) {
	changers, err := a.vtlService.ListMediaChangers()
	if err != nil {
		log.Printf("list VTL media changers error: %v", err)
		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to list VTL media changers: %v", err)))
		return
	}

	writeJSON(w, http.StatusOK, changers)
}

// handleGetVTLMediaChangerStatus returns media changer status (all changers)
func (a *App) handleGetVTLMediaChangerStatus(w http.ResponseWriter, r *http.Request) {
	changers, err := a.vtlService.ListMediaChangers()
	if err != nil {
		log.Printf("get VTL media changer status error: %v", err)
		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to get VTL media changer status: %v", err)))
		return
	}

	// Return all changers, or first one if only one is requested
	if len(changers) == 0 {
		writeError(w, errors.ErrNotFound("no media changer found"))
		return
	}

	// Return all changers as array
	writeJSON(w, http.StatusOK, changers)
}

// handleLoadTape loads a tape into a drive
func (a *App) handleLoadTape(w http.ResponseWriter, r *http.Request) {
	var req struct {
		DriveID int    `json:"drive_id"`
		Barcode string `json:"barcode"`
	}

	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, errors.ErrValidation(fmt.Sprintf("invalid request body: %v", err)))
		return
	}

	if req.Barcode == "" {
		writeError(w, errors.ErrValidation("barcode is required"))
		return
	}

	if err := a.vtlService.LoadTape(req.DriveID, req.Barcode); err != nil {
		log.Printf("load tape error: %v", err)
		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to load tape: %v", err)))
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{
		"message":  "Tape loaded successfully",
		"barcode":  req.Barcode,
		"drive_id": fmt.Sprintf("%d", req.DriveID),
	})
}

// handleEjectTape ejects a tape from a drive
func (a *App) handleEjectTape(w http.ResponseWriter, r *http.Request) {
	var req struct {
		DriveID int `json:"drive_id"`
	}

	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, errors.ErrValidation(fmt.Sprintf("invalid request body: %v", err)))
		return
	}

	if err := a.vtlService.EjectTape(req.DriveID); err != nil {
		log.Printf("eject tape error: %v", err)
		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to eject tape: %v", err)))
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{
		"message":  "Tape ejected successfully",
		"drive_id": fmt.Sprintf("%d", req.DriveID),
	})
}

// handleListVTLDevicesForISCSI returns all tape devices (drives and medium changers) for iSCSI passthrough
func (a *App) handleListVTLDevicesForISCSI(w http.ResponseWriter, r *http.Request) {
	devices := []map[string]interface{}{}

	// Get drives
	drives, err := a.vtlService.ListDrives()
	if err == nil {
		for _, drive := range drives {
			devices = append(devices, map[string]interface{}{
				"type":        "drive",
				"device":      drive.Device,
				"id":          drive.ID,
				"library_id":  drive.LibraryID,
				"vendor":      drive.Vendor,
				"product":     drive.Product,
				"description": fmt.Sprintf("Tape Drive %d (Library %d) - %s %s", drive.ID, drive.LibraryID, drive.Vendor, drive.Product),
			})
		}
	}

	// Get medium changers
	changers, err := a.vtlService.ListMediaChangers()
	if err == nil {
		for _, changer := range changers {
			devices = append(devices, map[string]interface{}{
				"type":        "changer",
				"device":      changer.Device,
				"id":          changer.ID,
				"library_id":  changer.LibraryID,
				"slots":       changer.Slots,
				"drives":      changer.Drives,
				"description": fmt.Sprintf("Media Changer (Library %d) - %d slots, %d drives", changer.LibraryID, changer.Slots, changer.Drives),
			})
		}
	}

	writeJSON(w, http.StatusOK, devices)
}