package v1

import (
	"database/sql"
	"encoding/csv"
	"errors"
	"net/http"
	"strings"
	"math/big"

	"github.com/google/uuid"
	"github.com/hay-kot/homebox/backend/internal/core/services"
	"github.com/hay-kot/homebox/backend/internal/data/repo"
	"github.com/hay-kot/homebox/backend/internal/sys/validate"
	"github.com/hay-kot/homebox/backend/internal/web/adapters"
	"github.com/hay-kot/httpkit/errchain"
	"github.com/hay-kot/httpkit/server"
	"github.com/rs/zerolog/log"
)

// HandleItemsGetAll godoc
//
//	@Summary  Query All Items
//	@Tags     Items
//	@Produce  json
//	@Param    q         query    string   false "search string"
//	@Param    page      query    int      false "page number"
//	@Param    pageSize  query    int      false "items per page"
//	@Param    labels    query    []string false "label Ids"    collectionFormat(multi)
//	@Param    locations query    []string false "location Ids" collectionFormat(multi)
//  @Param    parentIds query    []string false "parent Ids"   collectionFormat(multi)
//	@Success  200       {object} repo.PaginationResult[repo.ItemSummary]{}
//	@Router   /v1/items [GET]
//	@Security Bearer
func (ctrl *V1Controller) HandleItemsGetAll() errchain.HandlerFunc {
	extractQuery := func(r *http.Request) repo.ItemQuery {
		params := r.URL.Query()

		filterFieldItems := func(raw []string) []repo.FieldQuery {
			var items []repo.FieldQuery

			for _, v := range raw {
				parts := strings.SplitN(v, "=", 2)
				if len(parts) == 2 {
					items = append(items, repo.FieldQuery{
						Name:  parts[0],
						Value: parts[1],
					})
				}
			}

			return items
		}

		v := repo.ItemQuery{
			Page:            queryIntOrNegativeOne(params.Get("page")),
			PageSize:        queryIntOrNegativeOne(params.Get("pageSize")),
			Search:          params.Get("q"),
			LocationIDs:     queryUUIDList(params, "locations"),
			LabelIDs:        queryUUIDList(params, "labels"),
      ParentItemIDs:   queryUUIDList(params, "parentIds"),
			IncludeArchived: queryBool(params.Get("includeArchived")),
			Fields:          filterFieldItems(params["fields"]),
			OrderBy:         params.Get("orderBy"),
		}

		if strings.HasPrefix(v.Search, "#") {
			aidStr := strings.TrimPrefix(v.Search, "#")

			aid, ok := repo.ParseAssetID(aidStr)
			if ok {
				v.Search = ""
				v.AssetID = aid
			}
		}

		return v
	}

	return func(w http.ResponseWriter, r *http.Request) error {
		ctx := services.NewContext(r.Context())

		// deal with floating point precision
		items, err := ctrl.repo.Items.QueryByGroup(ctx, ctx.GID, extractQuery(r))
		totalPrice := new(big.Int)
		for _, item := range items.Items {
			totalPrice.Add(totalPrice, big.NewInt(int64(item.PurchasePrice * 100)))
		}

		totalPriceFloat := new(big.Float).SetInt(totalPrice)
		totalPriceFloat.Quo(totalPriceFloat, big.NewFloat(100))
		items.TotalPrice, _ = totalPriceFloat.Float64()

		if err != nil {
			if errors.Is(err, sql.ErrNoRows) {
				return server.JSON(w, http.StatusOK, repo.PaginationResult[repo.ItemSummary]{
					Items: []repo.ItemSummary{},
				})
			}
			log.Err(err).Msg("failed to get items")
			return validate.NewRequestError(err, http.StatusInternalServerError)
		}
		return server.JSON(w, http.StatusOK, items)
	}
}

// HandleItemsCreate godoc
//
//	@Summary  Create Item
//	@Tags     Items
//	@Produce  json
//	@Param    payload body     repo.ItemCreate true "Item Data"
//	@Success  201     {object} repo.ItemSummary
//	@Router   /v1/items [POST]
//	@Security Bearer
func (ctrl *V1Controller) HandleItemsCreate() errchain.HandlerFunc {
	fn := func(r *http.Request, body repo.ItemCreate) (repo.ItemOut, error) {
		return ctrl.svc.Items.Create(services.NewContext(r.Context()), body)
	}

	return adapters.Action(fn, http.StatusCreated)
}

// HandleItemGet godocs
//
//	@Summary  Get Item
//	@Tags     Items
//	@Produce  json
//	@Param    id  path     string true "Item ID"
//	@Success  200 {object} repo.ItemOut
//	@Router   /v1/items/{id} [GET]
//	@Security Bearer
func (ctrl *V1Controller) HandleItemGet() errchain.HandlerFunc {
	fn := func(r *http.Request, ID uuid.UUID) (repo.ItemOut, error) {
		auth := services.NewContext(r.Context())

		return ctrl.repo.Items.GetOneByGroup(auth, auth.GID, ID)
	}

	return adapters.CommandID("id", fn, http.StatusOK)
}

// HandleItemDelete godocs
//
//	@Summary  Delete Item
//	@Tags     Items
//	@Produce  json
//	@Param    id path string true "Item ID"
//	@Success  204
//	@Router   /v1/items/{id} [DELETE]
//	@Security Bearer
func (ctrl *V1Controller) HandleItemDelete() errchain.HandlerFunc {
	fn := func(r *http.Request, ID uuid.UUID) (any, error) {
		auth := services.NewContext(r.Context())
		err := ctrl.repo.Items.DeleteByGroup(auth, auth.GID, ID)
		return nil, err
	}

	return adapters.CommandID("id", fn, http.StatusNoContent)
}

// HandleItemUpdate godocs
//
//	@Summary  Update Item
//	@Tags     Items
//	@Produce  json
//	@Param    id      path     string          true "Item ID"
//	@Param    payload body     repo.ItemUpdate true "Item Data"
//	@Success  200     {object} repo.ItemOut
//	@Router   /v1/items/{id} [PUT]
//	@Security Bearer
func (ctrl *V1Controller) HandleItemUpdate() errchain.HandlerFunc {
	fn := func(r *http.Request, ID uuid.UUID, body repo.ItemUpdate) (repo.ItemOut, error) {
		auth := services.NewContext(r.Context())

		body.ID = ID
		return ctrl.repo.Items.UpdateByGroup(auth, auth.GID, body)
	}

	return adapters.ActionID("id", fn, http.StatusOK)
}

// HandleItemPatch godocs
//
//	@Summary  Update Item
//	@Tags     Items
//	@Produce  json
//	@Param    id      path     string          true "Item ID"
//	@Param    payload body     repo.ItemPatch true "Item Data"
//	@Success  200     {object} repo.ItemOut
//	@Router   /v1/items/{id} [Patch]
//	@Security Bearer
func (ctrl *V1Controller) HandleItemPatch() errchain.HandlerFunc {
	fn := func(r *http.Request, ID uuid.UUID, body repo.ItemPatch) (repo.ItemOut, error) {
		auth := services.NewContext(r.Context())

		body.ID = ID
		err := ctrl.repo.Items.Patch(auth, auth.GID, ID, body)
		if err != nil {
			return repo.ItemOut{}, err
		}

		return ctrl.repo.Items.GetOneByGroup(auth, auth.GID, ID)
	}

	return adapters.ActionID("id", fn, http.StatusOK)
}

// HandleGetAllCustomFieldNames godocs
//
//	@Summary  Get All Custom Field Names
//	@Tags     Items
//	@Produce  json
//	@Success  200
//	@Router   /v1/items/fields [GET]
//	@Success  200     {object} []string
//	@Security Bearer
func (ctrl *V1Controller) HandleGetAllCustomFieldNames() errchain.HandlerFunc {
	fn := func(r *http.Request) ([]string, error) {
		auth := services.NewContext(r.Context())
		return ctrl.repo.Items.GetAllCustomFieldNames(auth, auth.GID)
	}

	return adapters.Command(fn, http.StatusOK)
}

// HandleGetAllCustomFieldValues godocs
//
//	@Summary  Get All Custom Field Values
//	@Tags     Items
//	@Produce  json
//	@Success  200
//	@Router   /v1/items/fields/values [GET]
//	@Success  200     {object} []string
//	@Security Bearer
func (ctrl *V1Controller) HandleGetAllCustomFieldValues() errchain.HandlerFunc {
	type query struct {
		Field string `schema:"field" validate:"required"`
	}

	fn := func(r *http.Request, q query) ([]string, error) {
		auth := services.NewContext(r.Context())
		return ctrl.repo.Items.GetAllCustomFieldValues(auth, auth.GID, q.Field)
	}

	return adapters.Query(fn, http.StatusOK)
}

// HandleItemsImport godocs
//
//	@Summary  Import Items
//	@Tags     Items
//	@Produce  json
//	@Success  204
//	@Param    csv formData file true "Image to upload"
//	@Router   /v1/items/import [Post]
//	@Security Bearer
func (ctrl *V1Controller) HandleItemsImport() errchain.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) error {
		err := r.ParseMultipartForm(ctrl.maxUploadSize << 20)
		if err != nil {
			log.Err(err).Msg("failed to parse multipart form")
			return validate.NewRequestError(err, http.StatusInternalServerError)
		}

		file, _, err := r.FormFile("csv")
		if err != nil {
			log.Err(err).Msg("failed to get file from form")
			return validate.NewRequestError(err, http.StatusInternalServerError)
		}

		user := services.UseUserCtx(r.Context())

		_, err = ctrl.svc.Items.CsvImport(r.Context(), user.GroupID, file)
		if err != nil {
			log.Err(err).Msg("failed to import items")
			return validate.NewRequestError(err, http.StatusInternalServerError)
		}

		return server.JSON(w, http.StatusNoContent, nil)
	}
}

// HandleItemsExport godocs
//
//	@Summary  Export Items
//	@Tags     Items
//	@Success 200 {string} string "text/csv"
//	@Router   /v1/items/export [GET]
//	@Security Bearer
func (ctrl *V1Controller) HandleItemsExport() errchain.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) error {
		ctx := services.NewContext(r.Context())

		csvData, err := ctrl.svc.Items.ExportTSV(r.Context(), ctx.GID)
		if err != nil {
			log.Err(err).Msg("failed to export items")
			return validate.NewRequestError(err, http.StatusInternalServerError)
		}

		w.Header().Set("Content-Type", "text/tsv")
		w.Header().Set("Content-Disposition", "attachment;filename=homebox-items.tsv")

		writer := csv.NewWriter(w)
		writer.Comma = '\t'
		return writer.WriteAll(csvData)
	}
}