package handler

import (
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"vctp/internal/report"
)

// InventoryReportDownload returns the inventory report as an XLSX download.
// @Summary Download inventory report
// @Description Generates an inventory XLSX report and returns it as a file download.
// @Tags reports
// @Produce application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
// @Success 200 {file} file "Inventory XLSX report"
// @Failure 500 {object} map[string]string "Report generation failed"
// @Router /api/report/inventory [get]
func (h *Handler) InventoryReportDownload(w http.ResponseWriter, r *http.Request) {

	ctx := context.Background()

	// Generate the XLSX report
	reportData, err := report.CreateInventoryReport(h.Logger, h.Database, ctx)
	if err != nil {
		h.Logger.Error("Failed to create report", "error", err)
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusInternalServerError)
		json.NewEncoder(w).Encode(map[string]string{
			"status":  "ERROR",
			"message": fmt.Sprintf("Unable to create xlsx report: '%s'", err),
		})
		return
	}

	// Set HTTP headers to indicate file download
	w.Header().Set("Content-Type", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
	w.Header().Set("Content-Disposition", `attachment; filename="inventory_report.xlsx"`)
	w.Header().Set("File-Name", "inventory_report.xlsx")

	// Write the XLSX file to the HTTP response
	w.Write(reportData)
}

// UpdateReportDownload returns the updates report as an XLSX download.
// @Summary Download updates report
// @Description Generates an updates XLSX report and returns it as a file download.
// @Tags reports
// @Produce application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
// @Success 200 {file} file "Updates XLSX report"
// @Failure 500 {object} map[string]string "Report generation failed"
// @Router /api/report/updates [get]
func (h *Handler) UpdateReportDownload(w http.ResponseWriter, r *http.Request) {

	ctx := context.Background()

	// Generate the XLSX report
	reportData, err := report.CreateUpdatesReport(h.Logger, h.Database, ctx)
	if err != nil {
		h.Logger.Error("Failed to create report", "error", err)
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusInternalServerError)
		json.NewEncoder(w).Encode(map[string]string{
			"status":  "ERROR",
			"message": fmt.Sprintf("Unable to create xlsx report: '%s'", err),
		})
		return
	}

	// Set HTTP headers to indicate file download
	w.Header().Set("Content-Type", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
	w.Header().Set("Content-Disposition", `attachment; filename="updates_report.xlsx"`)
	w.Header().Set("File-Name", "updates_report.xlsx")

	// Write the XLSX file to the HTTP response
	w.Write(reportData)
}