package savedrecipe

import "time"

// UserSavedRecipe is a user's bookmark referencing a catalog recipe.
// Display fields are populated by joining dishes + recipes.
type UserSavedRecipe struct {
	ID       string    `json:"id"`
	UserID   string    `json:"-"`
	RecipeID string    `json:"recipe_id"`
	SavedAt  time.Time `json:"saved_at"`

	// Display data — joined from dishes + recipes.
	DishName    string   `json:"title"`        // dish name used as display title
	Description *string  `json:"description"`
	ImageURL    *string  `json:"image_url"`
	CuisineSlug *string  `json:"cuisine_slug"`
	Tags        []string `json:"tags"`

	Difficulty  *string  `json:"difficulty"`
	PrepTimeMin *int     `json:"prep_time_min"`
	CookTimeMin *int     `json:"cook_time_min"`
	Servings    *int     `json:"servings"`

	CaloriesPerServing *float64 `json:"calories_per_serving"`
	ProteinPerServing  *float64 `json:"protein_per_serving"`
	FatPerServing      *float64 `json:"fat_per_serving"`
	CarbsPerServing    *float64 `json:"carbs_per_serving"`

	Ingredients []RecipeIngredient `json:"ingredients"`
	Steps       []RecipeStep       `json:"steps"`
}

// RecipeIngredient is a single ingredient row.
type RecipeIngredient struct {
	Name       string  `json:"name"`
	Amount     float64 `json:"amount"`
	UnitCode   *string `json:"unit_code"`
	IsOptional bool    `json:"is_optional"`
}

// RecipeStep is a single step row.
type RecipeStep struct {
	StepNumber   int    `json:"number"`
	Description  string `json:"description"`
	TimerSeconds *int   `json:"timer_seconds"`
}

// SaveRequest is the body for POST /saved-recipes.
// When recipe_id is provided, the existing catalog recipe is bookmarked.
// Otherwise a new dish+recipe is created from the supplied fields.
type SaveRequest struct {
	RecipeID    string `json:"recipe_id"`     // optional: bookmark existing recipe
	Title       string `json:"title"`
	Description string `json:"description"`
	Cuisine     string `json:"cuisine"`
	Difficulty  string `json:"difficulty"`
	PrepTimeMin int    `json:"prep_time_min"`
	CookTimeMin int    `json:"cook_time_min"`
	Servings    int    `json:"servings"`
	ImageURL    string `json:"image_url"`
	// Ingredients / Steps / Tags / Nutrition are JSONB for backward compatibility
	// with the recommendation flow that sends the full Gemini response.
	Ingredients interface{} `json:"ingredients"`
	Steps       interface{} `json:"steps"`
	Tags        interface{} `json:"tags"`
	Nutrition   interface{} `json:"nutrition_per_serving"`
	Source      string      `json:"source"`
}

// ErrNotFound is returned when a saved recipe does not exist for the given user.
var ErrNotFound = errorString("saved recipe not found")

type errorString string

func (e errorString) Error() string { return string(e) }