package photos

import (
	"strings"

	"github.com/ultisuite/ulti-backend/internal/api/apivalidate"
)

const maxJSONRequestBody = 32 << 10

type createAlbumRequest struct {
	Name        string   `json:"name"`
	Description string   `json:"description"`
	AssetIDs    []string `json:"asset_ids"`
}

type updateAlbumRequest struct {
	Name        *string `json:"name"`
	Description *string `json:"description"`
}

type albumAssetsRequest struct {
	AssetIDs []string `json:"asset_ids"`
}

func validateAssetID(assetID string) *apivalidate.ValidationError {
	if strings.TrimSpace(assetID) == "" {
		return apivalidate.NewValidationError(apivalidate.FieldDetail{
			Field: "asset_id", Message: "required",
		})
	}
	return nil
}

func validateAlbumID(albumID string) *apivalidate.ValidationError {
	if strings.TrimSpace(albumID) == "" {
		return apivalidate.NewValidationError(apivalidate.FieldDetail{
			Field: "album_id", Message: "required",
		})
	}
	return nil
}

func validateAlbumName(field, name string, required bool) *apivalidate.FieldDetail {
	name = strings.TrimSpace(name)
	if name == "" {
		if required {
			return &apivalidate.FieldDetail{Field: field, Message: "required"}
		}
		return nil
	}
	if strings.Contains(name, "\n") || strings.Contains(name, "\r") {
		return &apivalidate.FieldDetail{Field: field, Message: "invalid"}
	}
	return nil
}

func validateAssetIDs(field string, assetIDs []string, required bool) []apivalidate.FieldDetail {
	if len(assetIDs) == 0 {
		if required {
			return []apivalidate.FieldDetail{{Field: field, Message: "required"}}
		}
		return nil
	}
	var details []apivalidate.FieldDetail
	for i, id := range assetIDs {
		if strings.TrimSpace(id) == "" {
			details = append(details, apivalidate.FieldDetail{
				Field: field, Message: "invalid",
			})
			if i == 0 {
				break
			}
		}
	}
	return details
}

func validateCreateAlbum(req *createAlbumRequest) *apivalidate.ValidationError {
	var details []apivalidate.FieldDetail
	if d := validateAlbumName("name", req.Name, true); d != nil {
		details = append(details, *d)
	}
	if d := validateAlbumName("description", req.Description, false); d != nil {
		details = append(details, *d)
	}
	details = append(details, validateAssetIDs("asset_ids", req.AssetIDs, false)...)
	if len(details) == 0 {
		return nil
	}
	return apivalidate.NewValidationError(details...)
}

func validateUpdateAlbum(req *updateAlbumRequest) *apivalidate.ValidationError {
	if req.Name == nil && req.Description == nil {
		return apivalidate.NewValidationError(apivalidate.FieldDetail{
			Field: "body", Message: "required",
		})
	}
	var details []apivalidate.FieldDetail
	if req.Name != nil {
		if d := validateAlbumName("name", *req.Name, true); d != nil {
			details = append(details, *d)
		}
	}
	if req.Description != nil {
		if d := validateAlbumName("description", *req.Description, false); d != nil {
			details = append(details, *d)
		}
	}
	if len(details) == 0 {
		return nil
	}
	return apivalidate.NewValidationError(details...)
}

func validateAlbumAssetsRequest(req *albumAssetsRequest) *apivalidate.ValidationError {
	details := validateAssetIDs("asset_ids", req.AssetIDs, true)
	if len(details) == 0 {
		return nil
	}
	return apivalidate.NewValidationError(details...)
}