package controllers

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

	"nearle/models"
	"nearle/services"

	"github.com/gofiber/fiber/v2"
)

type CatalogueUploadController struct {
	service services.CatalogueUploadService
}

func NewCatalogueUploadController(service services.CatalogueUploadService) *CatalogueUploadController {
	return &CatalogueUploadController{service: service}
}

// RecordUpload stores the receipt for a spreadsheet just accepted by the ingest
// service.
//
// Called the moment the drop is accepted, before any polling — that is the one
// instant the batch id is guaranteed to exist and guaranteed not to have been
// lost. Everything after it (the review wait, the run, the shelving) can be
// recovered from the id; the id itself cannot be recovered from anything.
func (ctl *CatalogueUploadController) RecordUpload(c *fiber.Ctx) error {
	var input models.CatalogueUpload
	if err := c.BodyParser(&input); err != nil {
		return c.JSON(fiber.Map{"code": http.StatusBadRequest, "message": "Invalid input", "status": false})
	}

	if strings.TrimSpace(input.Batchid) == "" {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "batchid is required — it is the only credential for reading the result back",
			"status":  false,
		})
	}
	if input.Tenantid <= 0 {
		// A receipt with no tenant belongs to nobody and would be visible to
		// every store login that asks for "all". Refused rather than stored
		// unscoped.
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "tenantid is required — a receipt has to belong to a merchant",
			"status":  false,
		})
	}

	if err := ctl.service.Record(&input); err != nil {
		return c.JSON(fiber.Map{"code": http.StatusInternalServerError, "message": err.Error(), "status": false})
	}
	return c.JSON(fiber.Map{"code": 200, "message": "Upload recorded", "status": true, "details": input})
}

// GetUploads lists receipts for whoever is asking.
//
// `tenantid=0` means every tenant and is how a Nearle Admin sees the platform.
// The console decides which to send from the session — the same rule the import
// itself follows — because a store login reading another merchant's receipts
// would see what that merchant stocks.
func (ctl *CatalogueUploadController) GetUploads(c *fiber.Ctx) error {
	tenantID, _ := strconv.Atoi(c.Query("tenantid", "0"))
	locationID, _ := strconv.Atoi(c.Query("locationid", "0"))
	pageNo, _ := strconv.Atoi(c.Query("pageno", "1"))
	pageSize, _ := strconv.Atoi(c.Query("pagesize", "50"))

	data, err := ctl.service.List(tenantID, locationID, pageNo, pageSize)
	if err != nil {
		return c.JSON(fiber.Map{"code": http.StatusInternalServerError, "message": err.Error(), "status": false})
	}
	// Never null. An empty list is a legitimate answer — a shop that has never
	// uploaded — and a JSON null here makes every caller guard a case that is
	// really just "none yet".
	if data == nil {
		data = []models.CatalogueUpload{}
	}
	return c.JSON(fiber.Map{"code": 200, "message": "Success", "status": true, "details": data})
}

// UpdateUpload caches what the ingest service last reported.
//
// Written by the browser that is polling, because that is where the reading
// happens: the batch id is the credential and the read is anonymous, so the
// person waiting is already holding the answer. This endpoint only writes it
// down so the next person does not have to wait for it again.
func (ctl *CatalogueUploadController) UpdateUpload(c *fiber.Ctx) error {
	var input models.CatalogueUpload
	if err := c.BodyParser(&input); err != nil {
		return c.JSON(fiber.Map{"code": http.StatusBadRequest, "message": "Invalid input", "status": false})
	}
	if strings.TrimSpace(input.Batchid) == "" {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code": http.StatusBadRequest, "message": "batchid is required", "status": false,
		})
	}
	if err := ctl.service.UpdateStatus(&input); err != nil {
		return c.JSON(fiber.Map{"code": http.StatusInternalServerError, "message": err.Error(), "status": false})
	}
	return c.JSON(fiber.Map{"code": 200, "message": "Upload updated", "status": true})
}

// MarkShelved records that the products reached a branch's shelf with a price
// and their opening stock.
//
// Separate from UpdateUpload on purpose. The ingest service confirms the global
// catalogue, which every merchant shares and which therefore carries no price
// and no stock — so "added" and "on sale here" are two different claims, made by
// two different systems, and a receipt that ran them together would report
// products as sellable that no customer can buy.
func (ctl *CatalogueUploadController) MarkShelved(c *fiber.Ctx) error {
	var input struct {
		Batchid string `json:"batchid"`
		Shelved int    `json:"shelved"`
		Skipped int    `json:"skipped"`
	}
	if err := c.BodyParser(&input); err != nil {
		return c.JSON(fiber.Map{"code": http.StatusBadRequest, "message": "Invalid input", "status": false})
	}
	if strings.TrimSpace(input.Batchid) == "" {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code": http.StatusBadRequest, "message": "batchid is required", "status": false,
		})
	}
	if err := ctl.service.MarkShelved(input.Batchid, input.Shelved, input.Skipped); err != nil {
		return c.JSON(fiber.Map{"code": http.StatusInternalServerError, "message": err.Error(), "status": false})
	}
	return c.JSON(fiber.Map{"code": 200, "message": "Shelving recorded", "status": true})
}

// AttachSheet supplies the prices and opening stock for a receipt that has
// none, so its products can still be put on a shelf.
//
// Needed because the receipt and the sheet used to part company. The ingest
// service holds neither price nor stock — its catalogue is shared by every
// merchant — so both live only in the spreadsheet, and a receipt written before
// those rows were stored has no way to finish. Handing the file over again is
// the only way back, and this is where it lands.
func (ctl *CatalogueUploadController) AttachSheet(c *fiber.Ctx) error {
	var input struct {
		Batchid   string `json:"batchid"`
		Sheetrows string `json:"sheetrows"`
	}
	if err := c.BodyParser(&input); err != nil {
		return c.JSON(fiber.Map{"code": http.StatusBadRequest, "message": "Invalid input", "status": false})
	}
	if strings.TrimSpace(input.Batchid) == "" || strings.TrimSpace(input.Sheetrows) == "" {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code": http.StatusBadRequest, "message": "batchid and sheetrows are both required", "status": false,
		})
	}
	if err := ctl.service.AttachSheet(input.Batchid, input.Sheetrows); err != nil {
		return c.JSON(fiber.Map{"code": http.StatusInternalServerError, "message": err.Error(), "status": false})
	}
	return c.JSON(fiber.Map{"code": 200, "message": "Sheet attached", "status": true})
}