package controllers

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

	"nearle/models"
	"nearle/services"

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

type ProductController struct {
	productService services.ProductService
}

func NewProductController(productService services.ProductService) *ProductController {
	return &ProductController{productService: productService}
}

func (ctl *ProductController) GetProductSubCategory(c *fiber.Ctx) error {
	categoryID, _ := strconv.Atoi(c.Query("categoryid", "0"))
	tenantID, _ := strconv.Atoi(c.Query("tenantid", "0"))

	data, err := ctl.productService.GetProductSubCategory(categoryID, tenantID)
	if err != nil {
		return c.JSON(fiber.Map{
			"code":    http.StatusInternalServerError,
			"message": err.Error(),
			"status":  false,
		})
	}

	return c.JSON(fiber.Map{
		"code":    200,
		"message": "Success",
		"status":  true,
		"details": data,
	})
}

func (ctl *ProductController) GetProductCount(c *fiber.Ctx) error {
	tenantID, _ := strconv.Atoi(c.Query("tenantid"))
	categoryID, _ := strconv.Atoi(c.Query("categoryid"))
	subcategoryID, _ := strconv.Atoi(c.Query("subcategoryid"))
	// locationID, _ := strconv.Atoi(c.Query("locationid"))
	approve := c.Query("approve", "")

	data, err := ctl.productService.GetProductCount(tenantID, categoryID, subcategoryID, approve)
	if err != nil {
		return c.JSON(fiber.Map{
			"code":    http.StatusConflict,
			"message": "failed",
			"status":  false,
		})
	}

	return c.JSON(fiber.Map{
		"code":    http.StatusOK,
		"message": "Success",
		"status":  true,
		"details": data,
	})
}

func (ctl *ProductController) GetProductCategory(c *fiber.Ctx) error {
	data, err := ctl.productService.GetProductCategory()
	if err != nil {
		return c.JSON(fiber.Map{
			"code":    500,
			"message": "Failed to fetch categories",
			"status":  false,
		})
	}

	return c.JSON(fiber.Map{
		"code":    http.StatusOK,
		"message": "Success",
		"status":  true,
		"details": data,
	})
}

func (ctl *ProductController) GetProductVariants(c *fiber.Ctx) error {

	tenantID, _ := strconv.Atoi(c.Query("tenantid"))
	subcategoryID, _ := strconv.Atoi(c.Query("subcategoryid"))

	data, err := ctl.productService.GetProductVariants(tenantID, subcategoryID)
	if err != nil {
		return c.JSON(fiber.Map{
			"code":    500,
			"message": "Failed to fetch Product varients",
			"status":  false,
		})
	}

	return c.JSON(fiber.Map{
		"code":    http.StatusOK,
		"message": "Success",
		"status":  true,
		"details": data,
	})
}

func (ctl *ProductController) GetCatalougeProducts(c *fiber.Ctx) error {

	tenantID, _ := strconv.Atoi(c.Query("tenantid"))
	locationID, _ := strconv.Atoi(c.Query("locationid"))
	subcategoryID, _ := strconv.Atoi(c.Query("subcategoryid"))
	keyword := c.Query("keyword")
	pageno, _ := strconv.Atoi(c.Query("pageno"))
	pagesize, _ := strconv.Atoi(c.Query("pagesize"))

	data, err := ctl.productService.GetCatalougeProducts(tenantID, locationID, subcategoryID, pageno, pagesize, keyword)
	if err != nil {
		return c.JSON(fiber.Map{
			"code":    500,
			"message": "Failed to fetch Catalouge Product",
			"status":  false,
		})
	}

	return c.JSON(fiber.Map{
		"code":    http.StatusOK,
		"message": "Success",
		"status":  true,
		"details": data,
	})

}

func (ctl *ProductController) GetProductStocks(c *fiber.Ctx) error {
	tenantID := c.Query("tenantid")
	locationID := c.Query("locationid")

	stocks, err := ctl.productService.GetProductStocks(tenantID, locationID)
	if err != nil {
		return c.JSON(fiber.Map{
			"code":    500,
			"message": "Failed to fetch product stocks",
			"status":  false,
		})
	}

	return c.JSON(fiber.Map{
		"code":    200,
		"message": "Product stocks fetched successfully",
		"status":  true,
		"data":    stocks,
	})
}

func (ctl *ProductController) CreateProductStock(c *fiber.Ctx) error {
	var stocks []models.Productstock

	if err := c.BodyParser(&stocks); err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
			"code":    400,
			"message": "Invalid request body",
			"status":  false,
		})
	}

	if err := ctl.productService.CreateProductStock(stocks); err != nil {
		return c.JSON(fiber.Map{
			"code":    500,
			"message": "Failed to create product stocks",
			"status":  false,
		})
	}

	return c.JSON(fiber.Map{
		"code":    201,
		"message": "Product stocks created successfully",
		"status":  true,
		"details": stocks,
	})
}

func (ctl *ProductController) CreateProduct(c *fiber.Ctx) error {
	var product models.Products

	if err := c.BodyParser(&product); err != nil {
		return c.JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "Invalid request body",
			"status":  false,
		})
	}

	// The created row, not the parsed body.
	//
	// This returned the struct it had just parsed off the request, which by
	// definition carried `productid: 0` — the id is assigned by the database a
	// moment later and was never read back. Every caller that needed the id
	// went and looked the product up again by SKU.
	created, err := ctl.productService.CreateProduct(product)
	if err != nil {
		return c.JSON(fiber.Map{
			"code":    http.StatusInternalServerError,
			"message": "Failed to create product",
			"status":  false,
		})
	}

	return c.JSON(fiber.Map{
		"code":    http.StatusCreated,
		"message": "Product created successfully",
		"status":  true,
		"data":    created,
	})
}

func (ctl *ProductController) UpdateProduct(c *fiber.Ctx) error {
	var product models.Products

	if err := c.BodyParser(&product); err != nil {
		return c.JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "Invalid request body",
			"status":  false,
		})
	}

	if err := ctl.productService.UpdateProduct(product); err != nil {
		return c.JSON(fiber.Map{
			"code":    http.StatusConflict,
			"message": err.Error(),
			"status":  false,
		})
	}

	return c.JSON(fiber.Map{
		"code":    http.StatusAccepted,
		"message": "Product updated successfully",
		"status":  true,
		"data":    product,
	})
}

func (ctl *ProductController) DeleteProduct(c *fiber.Ctx) error {

	pidStr := c.Query("productid")
	pid, err := strconv.Atoi(pidStr)
	if err != nil || pid <= 0 {
		return c.JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "Invalid product ID",
			"status":  false,
		})
	}

	if err := ctl.productService.DeleteProduct(pid); err != nil {
		return c.JSON(fiber.Map{
			"code":    http.StatusInternalServerError,
			"message": err.Error(),
			"status":  false,
		})
	}

	return c.JSON(fiber.Map{
		"code":    http.StatusOK,
		"message": "Product deleted successfully",
		"status":  true,
	})
}

func (ctl *ProductController) GetStockStatement(c *fiber.Ctx) error {
	tenantID, _ := strconv.Atoi(c.Query("tenantid"))
	locationID, _ := strconv.Atoi(c.Query("locationid"))
	subcategoryID, _ := strconv.Atoi(c.Query("subcategoryid"))
	pageno, _ := strconv.Atoi(c.Query("pageno"))
	pagesize, _ := strconv.Atoi(c.Query("pagesize"))
	keyword := c.Query("keyword")

	data, err := ctl.productService.GetStockStatement(tenantID, locationID, subcategoryID, pageno, pagesize, keyword)
	if err != nil {
		return c.JSON(fiber.Map{
			"code":    http.StatusInternalServerError,
			"message": err.Error(),
			"status":  false,
		})
	}

	return c.JSON(fiber.Map{
		"code":    http.StatusOK,
		"message": "Success",
		"status":  true,
		"details": data,
	})
}

func (ctl *ProductController) GetLocationProducts(c *fiber.Ctx) error {
	tenantID, _ := strconv.Atoi(c.Query("tenantid"))
	locationID, _ := strconv.Atoi(c.Query("locationid"))
	subcategoryID, _ := strconv.Atoi(c.Query("subcategoryid"))
	keyword := c.Query("keyword")
	pageno, _ := strconv.Atoi(c.Query("pageno"))
	pagesize, _ := strconv.Atoi(c.Query("pagesize"))

	result, err := ctl.productService.GetLocationProducts(tenantID, locationID, subcategoryID, pageno, pagesize, keyword)
	if err != nil {
		return c.JSON(fiber.Map{
			"status":  false,
			"code":    http.StatusInternalServerError,
			"message": err.Error(),
		})
	}

	return c.JSON(fiber.Map{
		"status":  true,
		"code":    http.StatusOK,
		"message": "Success",
		"details": result,
	})
}

// GetSaleTemplate serves the data the web app turns into the offline-sales
// spreadsheet.
//
// locationid is optional and defaults to 0, meaning every branch the tenant
// runs — one workbook for the whole business, with each row carrying the branch
// its stock belongs to. A store user passes their own locationid to get just
// theirs. tenantid is required: without it there is no scope at all.
func (ctl *ProductController) GetSaleTemplate(c *fiber.Ctx) error {
	tenantID, _ := strconv.Atoi(c.Query("tenantid"))
	locationID, _ := strconv.Atoi(c.Query("locationid", "0"))

	if tenantID <= 0 {
		return c.JSON(fiber.Map{
			"status":  false,
			"code":    http.StatusBadRequest,
			"message": "tenantid is required",
		})
	}

	result, err := ctl.productService.GetSaleTemplate(tenantID, locationID)
	if err != nil {
		return c.JSON(fiber.Map{
			"status":  false,
			"code":    http.StatusInternalServerError,
			"message": err.Error(),
		})
	}

	return c.JSON(fiber.Map{
		"status":  true,
		"code":    http.StatusOK,
		"message": "Success",
		"details": result,
	})
}

func (ctl *ProductController) GetLocationProductSummary(c *fiber.Ctx) error {
	tenantID, _ := strconv.Atoi(c.Query("tenantid"))
	locationID, _ := strconv.Atoi(c.Query("locationid"))

	result, err := ctl.productService.GetLocationProductSummary(tenantID, locationID)
	if err != nil {
		return c.JSON(fiber.Map{
			"status":  false,
			"code":    http.StatusInternalServerError,
			"message": err.Error(),
		})
	}

	return c.JSON(fiber.Map{
		"status":  true,
		"code":    http.StatusOK,
		"message": "Success",
		"details": result,
	})
}

func (ctl *ProductController) GetAllProducts(c *fiber.Ctx) error {
	categoryID, _ := strconv.Atoi(c.Query("categoryid"))
	subcategoryID, _ := strconv.Atoi(c.Query("subcategoryid"))
	productID, _ := strconv.Atoi(c.Query("productid"))
	applocationID, _ := strconv.Atoi(c.Query("applocationid"))
	tenantID, _ := strconv.Atoi(c.Query("tenantid"))
	locationID, _ := strconv.Atoi(c.Query("locationid"))
	keyword := c.Query("keyword", "")
	productStatus := c.Query("productstatus", "")
	approve := c.Query("approve", "")
	pageno, _ := strconv.Atoi(c.Query("pageno"))
	pagesize, _ := strconv.Atoi(c.Query("pagesize"))

	details, err := ctl.productService.FetchFilteredProducts(
		categoryID, subcategoryID, productID, applocationID, tenantID,
		locationID, keyword, productStatus, approve, pageno, pagesize,
	)

	// The customer app is not shown what the shop cannot sell.
	//
	// Scoped to the /v1/mob base rather than applied in the service, because
	// this one handler answers on BOTH bases and the two callers want opposite
	// things. The console reads it to restock — an empty line is exactly what a
	// merchant needs to see and act on, so filtering there would hide the work.
	// A shopper reading the same list can only be misled by it: measured
	// 2026-09-02 on R mart, four products were on offer in the app with a zero
	// balance, including Cadbury Bournvita 500g and two Amul packs. Ordering one
	// gets a 409 at checkout, after the shopper has chosen it.
	//
	// It filters on Productstock, the same number the response carries, so the
	// list and the figure beside it cannot disagree.
	if err == nil && isAppRequest(c) {
		details = services.InStockOnlyGrouped(details)

		// And nothing a shopper cannot be charged for. An unpriced product is
		// unfinished, not free, and ₹0 on a phone reads as the latter.
		details = services.PricedOnly(details)

		// One product, three sizes — not three products.
		//
		// A shop stocking Aachi Baby Fryums in 100g, 500g and 1kg has three
		// product rows, each with its own price and its own shelf. The shopper
		// should meet ONE listing and pick the size; the sizes travel with the
		// parent in `variantoptions`, so nothing becomes unreachable.
		//
		// Best-effort, like the stock filter above: if the lookup fails the
		// shopper sees the three rows they see today, which is worse than the
		// grouping and much better than an error.
		if isChild, cErr := ctl.productService.VariantChildIDs(tenantID); cErr == nil {
			details = services.WithoutVariantChildren(details, isChild)
		}
	}
	if err != nil {
		return c.JSON(fiber.Map{
			"status":  false,
			"code":    http.StatusConflict,
			"message": err.Error(),
		})
	}

	return c.JSON(fiber.Map{
		"status":  true,
		"code":    http.StatusOK,
		"message": "Success",
		"data":    details,
	})
}

func (ctl *ProductController) GetProductByVariant(c *fiber.Ctx) error {

	tenantID, _ := strconv.Atoi(c.Query("tenantid"))
	variantid, _ := strconv.Atoi(c.Query("variantid"))
	locationID, _ := strconv.Atoi(c.Query("locationid"))
	// `productid` is the parameter the ordering screen should send.
	//
	// With it the caller no longer has to know whether the thing it tapped has
	// sizes: a product in a variant group comes back with the whole group to
	// choose from, a product in none comes back on its own. Previously only
	// `variantid` was accepted, so an ungrouped product — `variants = 0`, which
	// is most of them — could not be requested at all and the order screen had
	// nothing to work with.
	productID, _ := strconv.Atoi(c.Query("productid"))

	// One of the two has to name something, and `variantid=0` names nothing.
	//
	// 0 is not a variant group — it is the value every UNGROUPED product
	// carries, so a query for it used to match the tenant's whole ungrouped
	// catalogue and return six unrelated products as each other's variants. The
	// ordering screen then had a list it could not choose from, and no order
	// could be placed. Refusing here turns that into one sentence naming the
	// parameter to send instead.
	if variantid <= 0 && productID <= 0 {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"status":  false,
			"message": "send productid (preferred) or a variantid above 0 — variantid 0 is not a variant group, it is what every ungrouped product carries",
		})
	}

	result, err := ctl.productService.GetProductByVariant(tenantID, variantid, locationID, productID)

	if err != nil {

		return c.JSON(fiber.Map{
			"code":    http.StatusConflict,
			"message": "failed",
			"status":  false,
		})

	}

	return c.JSON(fiber.Map{
		"code":    http.StatusOK,
		"message": "Success",
		"status":  true,
		"details": result,
	})

}

func (ctl *ProductController) GetProductsBySubcategory(c *fiber.Ctx) error {
	categoryID, err := strconv.Atoi(c.Query("categoryid"))
	if err != nil || categoryID == 0 {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
			"code":    400,
			"status":  false,
			"message": "Valid categoryid is required",
			"data":    fiber.Map{},
		})
	}

	params := models.ProductFilter{
		CategoryID:    categoryID,
		TenantID:      parseInt(c.Query("tenantid")),
		AppLocationID: parseInt(c.Query("applocationid")),
		ProductID:     parseInt(c.Query("productid")),
		Keyword:       c.Query("keyword"),
		LocationID:    parseInt(c.Query("locationid")),
	}

	result, err := ctl.productService.GetProductsBySubcategory(params)
	if err != nil {
		return c.Status(http.StatusInternalServerError).JSON(fiber.Map{
			"code":    500,
			"status":  false,
			"message": err.Error(),
			"data":    fiber.Map{},
		})
	}

	return c.JSON(fiber.Map{
		"code":    200,
		"status":  true,
		"message": "Success",
		"data":    result,
	})
}

func parseInt(s string) int {
	if s == "" {
		return 0
	}
	val, _ := strconv.Atoi(s)
	return val
}

func (ctl *ProductController) UpdateProductLocation(c *fiber.Ctx) error {
	var data models.Productlocations

	if err := c.BodyParser(&data); err != nil {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"status":  false,
			"code":    http.StatusBadRequest,
			"message": "Invalid request body",
		})
	}

	if err := ctl.productService.UpdateProductLocation(data); err != nil {
		return c.Status(http.StatusConflict).JSON(fiber.Map{
			"status":  false,
			"code":    http.StatusConflict,
			"message": err.Error(),
		})
	}

	return c.Status(http.StatusAccepted).JSON(fiber.Map{
		"status":  true,
		"code":    http.StatusAccepted,
		"message": "Product update successful",
	})
}

func (ctl *ProductController) CreateProductLocation(c *fiber.Ctx) error {
	var data []models.Productlocations

	if err := c.BodyParser(&data); err != nil {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "Invalid request body",
			"status":  false,
		})
	}

	if err := ctl.productService.CreateProductLocation(data); err != nil {
		return c.Status(http.StatusConflict).JSON(fiber.Map{
			"status":  false,
			"code":    http.StatusConflict,
			"message": err.Error(),
		})
	}

	return c.Status(http.StatusCreated).JSON(fiber.Map{
		"status":  true,
		"code":    http.StatusCreated,
		"message": "Success",
	})
}

// UpdateProductVariant puts a product into a variant group, or takes it out.
//
// variantid 0 means ungrouped and is allowed — it is a real thing to want. The
// read path is what refuses to treat 0 as a group to search for.
func (ctl *ProductController) UpdateProductVariant(c *fiber.Ctx) error {
	var body struct {
		Productid int `json:"productid"`
		Variantid int `json:"variantid"`
	}
	if err := c.BodyParser(&body); err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
			"code": http.StatusBadRequest, "status": false, "message": "Invalid request body",
		})
	}
	if body.Productid <= 0 {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
			"code": http.StatusBadRequest, "status": false, "message": "productid is required",
		})
	}
	if err := ctl.productService.UpdateProductVariant(body.Productid, body.Variantid); err != nil {
		return c.Status(fiber.StatusConflict).JSON(fiber.Map{
			"code": http.StatusConflict, "status": false, "message": err.Error(),
		})
	}
	return c.JSON(fiber.Map{"code": http.StatusOK, "status": true, "message": "Success"})
}

func (ctl *ProductController) CreateProductVariant(c *fiber.Ctx) error {
	var input models.Productvariant

	// Parse request body
	if err := c.BodyParser(&input); err != nil {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "Invalid request body",
			"status":  false,
		})
	}

	// Call service layer
	if err := ctl.productService.CreateProductVariant(input); err != nil {
		return c.Status(http.StatusConflict).JSON(fiber.Map{
			"code":    http.StatusConflict,
			"message": err.Error(),
			"status":  false,
		})
	}

	return c.Status(http.StatusOK).JSON(fiber.Map{
		"code":    http.StatusOK,
		"message": "Success",
		"status":  true,
	})
}

func (ctl *ProductController) ImportCatalogueProduct(c *fiber.Ctx) error {
	var data []models.ImportCatalogueProductRequest

	if err := c.BodyParser(&data); err != nil {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "Invalid request body",
			"status":  false,
		})
	}

	if len(data) == 0 {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "Request body must contain at least one product",
			"status":  false,
		})
	}

	for _, req := range data {
		// `categoryid` IS required, and the comment that used to sit here
		// argued the opposite. It said an unclassified product is "visibly
		// unfinished" and therefore harmless, and that importing "reaches no
		// shop and cannot be sold".
		//
		// Both halves were wrong, and a sweep of all 262 tenants measured it:
		// 7 products across 3 tenants sat with categoryid 0, and 6 outlets were
		// serving shoppers an EMPTY shop while their consoles listed stock.
		// Nothing was visibly unfinished — `getlocationproducts` does not filter
		// on category, so the product looked entirely normal to the merchant.
		// And import DOES reach a shop: it writes productlocations.
		//
		// The state was also unrecoverable. GetProductsBySubcategory rejects
		// categoryid 0 outright, `UpdateProduct` writes only
		// productlocations.status, and re-import corrected pricing alone — so
		// no request could put it right. Re-import now repairs the category
		// (productService.ImportCatalogueProduct), and this refuses to create
		// the state in the first place.
		//
		// A wrongly filed product remains the better failure: it is findable,
		// and it is fixable by re-importing. An unfiled one was neither.
		// Named individually rather than as one list of five.
		//
		// The old message recited every required field whichever one was
		// actually missing, so a request rejected for `categoryid: 0` read as
		// "catalogueid is required" and sent somebody looking at the wrong
		// field entirely. An error that does not say what is wrong costs more
		// than the branch it saves.
		var missing []string
		if req.Tenantid == 0 {
			missing = append(missing, "tenantid")
		}
		if req.Locationid == 0 {
			missing = append(missing, "locationid")
		}
		if req.Brand == "" {
			missing = append(missing, "brand")
		}
		if req.Catalogueid == 0 {
			missing = append(missing, "catalogueid")
		}
		if req.Categoryid == 0 {
			missing = append(missing, "categoryid")
		}
		if len(missing) > 0 {
			return c.Status(http.StatusBadRequest).JSON(fiber.Map{
				"code":    http.StatusBadRequest,
				"message": fmt.Sprintf("missing required field(s): %s", strings.Join(missing, ", ")),
				"status":  false,
			})
		}
	}

	if err := ctl.productService.ImportCatalogueProduct(data); err != nil {
		return c.Status(http.StatusConflict).JSON(fiber.Map{
			"status":  false,
			"code":    http.StatusConflict,
			"message": err.Error(),
		})
	}

	return c.Status(http.StatusCreated).JSON(fiber.Map{
		"status":  true,
		"code":    http.StatusCreated,
		"message": "Success",
	})
}

func (ctl *ProductController) GetImportedCatalogueProducts(c *fiber.Ctx) error {
	tenantID, _ := strconv.Atoi(c.Query("tenantid"))
	// brand is optional: omit it to check imported status across every
	// brand at once, matching the all-brands catalogue browse view.
	brand := c.Query("brand")

	if tenantID == 0 {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "tenantid is required",
			"status":  false,
		})
	}

	refs, err := ctl.productService.GetImportedCatalogueRefs(tenantID, brand)
	if err != nil {
		return c.Status(http.StatusInternalServerError).JSON(fiber.Map{
			"code":    http.StatusInternalServerError,
			"message": err.Error(),
			"status":  false,
		})
	}

	return c.JSON(fiber.Map{
		"code":    http.StatusOK,
		"message": "Success",
		"status":  true,
		"details": refs,
	})
}

func (ctl *ProductController) GetTenantCategories(c *fiber.Ctx) error {
	tenantID, _ := strconv.Atoi(c.Query("tenantid"))
	if tenantID == 0 {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "tenantid is required",
			"status":  false,
		})
	}

	categories, err := ctl.productService.GetTenantCategories(tenantID)
	if err != nil {
		return c.Status(http.StatusInternalServerError).JSON(fiber.Map{
			"code":    http.StatusInternalServerError,
			"message": err.Error(),
			"status":  false,
		})
	}

	return c.JSON(fiber.Map{
		"code":    http.StatusOK,
		"message": "Success",
		"status":  true,
		"details": categories,
	})
}

// Recategorise re-files a tenant's products in bulk.
//
// PUT and not POST: it changes rows that already exist and creates none. The
// response carries how many rows actually moved, which is the only way a caller
// can tell "all done" from "every id I sent was wrong".
func (ctl *ProductController) Recategorise(c *fiber.Ctx) error {
	var body struct {
		Tenantid int                            `json:"tenantid"`
		Updates  []models.ProductCategoryUpdate `json:"updates"`
	}
	if err := c.BodyParser(&body); err != nil {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "invalid body",
			"status":  false,
		})
	}
	if body.Tenantid == 0 {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "tenantid is required",
			"status":  false,
		})
	}

	moved, err := ctl.productService.RecategoriseProducts(body.Tenantid, body.Updates)
	if err != nil {
		return c.Status(http.StatusInternalServerError).JSON(fiber.Map{
			"code":    http.StatusInternalServerError,
			"message": err.Error(),
			"status":  false,
		})
	}

	return c.JSON(fiber.Map{
		"code":    http.StatusOK,
		"message": "Success",
		"status":  true,
		"details": fiber.Map{"moved": moved},
	})
}

// ResolveCategories exchanges category names for this tenant's category ids.
//
// POST, not GET, because it CREATES the categories it cannot find — a sheet
// naming an aisle this shop has never stocked should not fail, it should open
// the aisle. The response maps the name a caller sent to the id it must store.
//
// Keyed on the lowercased, trimmed name, so a caller can look up whatever
// casing its own sheet used without having to guess how it was filed.
func (ctl *ProductController) ResolveCategories(c *fiber.Ctx) error {
	var body struct {
		Tenantid int      `json:"tenantid"`
		Names    []string `json:"names"`
	}
	if err := c.BodyParser(&body); err != nil {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "invalid body",
			"status":  false,
		})
	}
	if body.Tenantid == 0 {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "tenantid is required",
			"status":  false,
		})
	}

	resolved, err := ctl.productService.EnsureTenantCategories(body.Tenantid, body.Names)
	if err != nil {
		return c.Status(http.StatusInternalServerError).JSON(fiber.Map{
			"code":    http.StatusInternalServerError,
			"message": err.Error(),
			"status":  false,
		})
	}

	return c.JSON(fiber.Map{
		"code":    http.StatusOK,
		"message": "Success",
		"status":  true,
		"details": resolved,
	})
}

func (ctl *ProductController) DeleteProductLocation(c *fiber.Ctx) error {
	var input struct {
		Tenantid   int `json:"tenantid"`
		Locationid int `json:"locationid"`
		Productid  int `json:"productid"`
	}

	if err := c.BodyParser(&input); err != nil {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "Invalid request body",
			"status":  false,
		})
	}

	if input.Tenantid == 0 || input.Locationid == 0 || input.Productid == 0 {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "tenantid, locationid, and productid are required",
			"status":  false,
		})
	}

	if err := ctl.productService.DeleteProductLocation(input.Tenantid, input.Locationid, input.Productid); err != nil {
		return c.Status(http.StatusConflict).JSON(fiber.Map{
			"code":    http.StatusConflict,
			"message": err.Error(),
			"status":  false,
		})
	}

	return c.Status(http.StatusOK).JSON(fiber.Map{
		"code":    http.StatusOK,
		"message": "Product location deleted successfully",
		"status":  true,
	})
}

// PublishProduct releases a product from the admin catalogue to every outlet.
//
// The two rules this enforces — a price is required, and publishing covers the
// whole tenant — live in the repository, so they hold for any caller rather
// than only for the console form that happens to ask nicely.
func (ctl *ProductController) PublishProduct(c *fiber.Ctx) error {
	var input struct {
		Tenantid  int     `json:"tenantid"`
		Productid int     `json:"productid"`
		Price     float64 `json:"price"`
		// Optional. Omitted leaves the product at 0%, which is a real rate for
		// staples rather than a missing value — so it is written as given
		// rather than skipped when zero.
		Taxpercent float64 `json:"taxpercent"`
	}

	if err := c.BodyParser(&input); err != nil {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code": http.StatusBadRequest, "message": "Invalid request body", "status": false,
		})
	}

	outlets, err := ctl.productService.PublishProduct(input.Tenantid, input.Productid, input.Price, input.Taxpercent)
	if err != nil {
		// 400 rather than 500: every failure here is something the caller can
		// act on — no price, no outlets, or a product that is not theirs.
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code": http.StatusBadRequest, "message": err.Error(), "status": false,
		})
	}

	return c.JSON(fiber.Map{
		"code": http.StatusOK, "status": true,
		"message": fmt.Sprintf("Published to %d outlet(s)", outlets),
		"details": fiber.Map{"productid": input.Productid, "outlets": outlets},
	})
}

// UnpublishProduct withdraws a product from every shop, keeping its rows.
func (ctl *ProductController) UnpublishProduct(c *fiber.Ctx) error {
	var input struct {
		Tenantid  int `json:"tenantid"`
		Productid int `json:"productid"`
	}

	if err := c.BodyParser(&input); err != nil {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code": http.StatusBadRequest, "message": "Invalid request body", "status": false,
		})
	}

	outlets, err := ctl.productService.UnpublishProduct(input.Tenantid, input.Productid)
	if err != nil {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code": http.StatusBadRequest, "message": err.Error(), "status": false,
		})
	}

	return c.JSON(fiber.Map{
		"code": http.StatusOK, "status": true,
		"message": fmt.Sprintf("Withdrawn from %d outlet(s)", outlets),
		"details": fiber.Map{"productid": input.Productid, "outlets": outlets},
	})
}

// RelinkCatalogue repairs a tenant's pointers back into the global catalogue.
//
// Defaults to a DRY RUN. The pass rewrites the column that decides what a
// browse screen claims a shop already holds, and clearing a link is not
// reversible from the outside — so the whole plan should be readable before any
// of it happens. Pass `apply=true` to write.
func (ctl *ProductController) RelinkCatalogue(c *fiber.Ctx) error {
	tenantID, _ := strconv.Atoi(c.Query("tenantid", "0"))
	if tenantID <= 0 {
		return c.Status(http.StatusBadRequest).JSON(fiber.Map{
			"code":    http.StatusBadRequest,
			"message": "tenantid is required — this repairs one merchant's links, not the platform's",
			"status":  false,
		})
	}
	// Anything but an explicit `apply=true` is a dry run, including a typo.
	apply := c.Query("apply", "") == "true"

	report, err := ctl.productService.RelinkCatalogue(tenantID, !apply)
	if err != nil {
		return c.JSON(fiber.Map{"code": http.StatusInternalServerError, "message": err.Error(), "status": false})
	}
	return c.JSON(fiber.Map{"code": 200, "message": "Success", "status": true, "details": report})
}