package web

import (
	"net/http"
	"strconv"

	"inventree/internal/models"
)

type assetRequest struct {
	AssetTag       string            `json:"asset_id"`
	Name           string            `json:"name"`
	ItemTypeID     int64             `json:"item_type_id"`
	FolderID       *int64            `json:"folder_id"`
	StatusID       int64             `json:"status_id"`
	AssignedUserID *int64            `json:"assigned_user_id"`
	Notes          string            `json:"notes"`
	Quantity       int               `json:"quantity"`
	Fields         map[string]string `json:"fields"`
}

func (req assetRequest) fieldValues() map[int64]string {
	out := make(map[int64]string, len(req.Fields))
	for k, v := range req.Fields {
		id, err := strconv.ParseInt(k, 10, 64)
		if err != nil {
			continue
		}
		out[id] = v
	}
	return out
}

func (a *App) handleAssetCreate(w http.ResponseWriter, r *http.Request) {
	var req assetRequest
	if err := readJSON(r, &req); err != nil {
		jsonErr(w, http.StatusBadRequest, err)
		return
	}
	asset := &models.Asset{
		AssetTag: req.AssetTag, Name: req.Name, ItemTypeID: req.ItemTypeID, FolderID: req.FolderID,
		StatusID: req.StatusID, AssignedUserID: req.AssignedUserID, Notes: req.Notes, Quantity: req.Quantity,
	}
	if err := a.Assets.Create(r.Context(), asset, req.fieldValues()); err != nil {
		jsonErr(w, http.StatusBadRequest, err)
		return
	}
	jsonOK(w, map[string]any{"id": asset.ID, "asset_id": asset.AssetTag, "folder_id": asset.FolderID})
}

func (a *App) handleAssetUpdate(w http.ResponseWriter, r *http.Request) {
	id, err := pathID(r, "id")
	if err != nil {
		jsonErr(w, http.StatusBadRequest, err)
		return
	}
	var req assetRequest
	if err := readJSON(r, &req); err != nil {
		jsonErr(w, http.StatusBadRequest, err)
		return
	}
	existing, err := a.Assets.Get(r.Context(), id)
	if err != nil {
		jsonErr(w, http.StatusNotFound, err)
		return
	}
	asset := &models.Asset{
		ID: id, AssetTag: req.AssetTag, Name: req.Name, ItemTypeID: existing.ItemTypeID, FolderID: req.FolderID,
		StatusID: req.StatusID, AssignedUserID: req.AssignedUserID, Notes: req.Notes, Quantity: req.Quantity,
	}
	if err := a.Assets.Update(r.Context(), asset, req.fieldValues()); err != nil {
		jsonErr(w, http.StatusBadRequest, err)
		return
	}
	jsonOK(w, map[string]any{"id": asset.ID, "asset_id": asset.AssetTag, "folder_id": asset.FolderID})
}

func (a *App) handleAssetDelete(w http.ResponseWriter, r *http.Request) {
	id, err := pathID(r, "id")
	if err != nil {
		jsonErr(w, http.StatusBadRequest, err)
		return
	}
	asset, err := a.Assets.Get(r.Context(), id)
	if err != nil {
		jsonErr(w, http.StatusNotFound, err)
		return
	}
	if err := a.Assets.Delete(r.Context(), id); err != nil {
		jsonErr(w, http.StatusInternalServerError, err)
		return
	}
	jsonOK(w, map[string]any{"id": id, "folder_id": asset.FolderID})
}

func (a *App) handleAssetDuplicate(w http.ResponseWriter, r *http.Request) {
	id, err := pathID(r, "id")
	if err != nil {
		jsonErr(w, http.StatusBadRequest, err)
		return
	}
	copyAsset, err := a.Assets.Duplicate(r.Context(), id)
	if err != nil {
		jsonErr(w, http.StatusBadRequest, err)
		return
	}
	jsonOK(w, map[string]any{"id": copyAsset.ID, "asset_id": copyAsset.AssetTag, "folder_id": copyAsset.FolderID})
}

type assetMoveRequest struct {
	FolderID *int64 `json:"folder_id"`
}

func (a *App) handleAssetMove(w http.ResponseWriter, r *http.Request) {
	id, err := pathID(r, "id")
	if err != nil {
		jsonErr(w, http.StatusBadRequest, err)
		return
	}
	var req assetMoveRequest
	if err := readJSON(r, &req); err != nil {
		jsonErr(w, http.StatusBadRequest, err)
		return
	}
	if err := a.Assets.Move(r.Context(), id, req.FolderID); err != nil {
		jsonErr(w, http.StatusInternalServerError, err)
		return
	}
	jsonOK(w, map[string]any{"id": id, "folder_id": req.FolderID})
}

// handleAssetGet returns a single asset as JSON, for lightweight lookups
// (e.g. the checkout modal) that don't need the full HTML detail panel.
func (a *App) handleAssetGet(w http.ResponseWriter, r *http.Request) {
	id, err := pathID(r, "id")
	if err != nil {
		jsonErr(w, http.StatusBadRequest, err)
		return
	}
	asset, err := a.Assets.Get(r.Context(), id)
	if err != nil {
		jsonErr(w, http.StatusNotFound, err)
		return
	}
	jsonOK(w, asset)
}

type assetCheckoutRequest struct {
	AssignedUserID *int64 `json:"assigned_user_id"`
}

// handleAssetCheckout assigns (checks out) or unassigns (checks in) an
// asset's user without touching any other field.
func (a *App) handleAssetCheckout(w http.ResponseWriter, r *http.Request) {
	id, err := pathID(r, "id")
	if err != nil {
		jsonErr(w, http.StatusBadRequest, err)
		return
	}
	var req assetCheckoutRequest
	if err := readJSON(r, &req); err != nil {
		jsonErr(w, http.StatusBadRequest, err)
		return
	}
	if err := a.Assets.AssignUser(r.Context(), id, req.AssignedUserID); err != nil {
		jsonErr(w, http.StatusInternalServerError, err)
		return
	}
	jsonOK(w, map[string]any{"id": id, "assigned_user_id": req.AssignedUserID})
}

type assetQuantityRequest struct {
	Delta int `json:"delta"`
}

// handleAssetQuantity increments or decrements a non-unique asset's
// quantity in place, for the +/- steppers on the asset panel and folder
// tables.
func (a *App) handleAssetQuantity(w http.ResponseWriter, r *http.Request) {
	id, err := pathID(r, "id")
	if err != nil {
		jsonErr(w, http.StatusBadRequest, err)
		return
	}
	var req assetQuantityRequest
	if err := readJSON(r, &req); err != nil {
		jsonErr(w, http.StatusBadRequest, err)
		return
	}
	asset, err := a.Assets.AdjustQuantity(r.Context(), id, req.Delta)
	if err != nil {
		jsonErr(w, http.StatusBadRequest, err)
		return
	}
	jsonOK(w, map[string]any{"id": id, "quantity": asset.Quantity})
}