// Package domain holds pansy's core types: plain structs mirroring the database
// schema and the sentinel errors the service layer returns. It has no
// dependencies on store, api, or any framework — every other package depends on
// it, not the other way around.
package domain

import "errors"

// Sentinel errors returned by the service layer and mapped to HTTP status codes
// by the API layer (404, 403, 409 respectively).
var (
	// ErrNotFound means the requested entity does not exist (or is invisible to
	// the actor, when we deliberately mask existence).
	ErrNotFound = errors.New("not found")
	// ErrForbidden means the actor is known but lacks permission for the action.
	ErrForbidden = errors.New("forbidden")
	// ErrVersionConflict means the row's version did not match the one supplied
	// with a PATCH/DELETE; the caller should refetch and retry.
	ErrVersionConflict = errors.New("version conflict")
)

// Enumerated string values mirrored from the schema CHECK constraints.
const (
	UnitMetric   = "metric"
	UnitImperial = "imperial"

	RoleViewer = "viewer"
	RoleEditor = "editor"

	KindBed       = "bed"
	KindGrowBag   = "grow_bag"
	KindContainer = "container"
	KindInGround  = "in_ground"
	KindTree      = "tree"
	KindPath      = "path"
	KindStructure = "structure"

	ShapeRect    = "rect"
	ShapeCircle  = "circle"
	ShapePolygon = "polygon" // reserved for post-v1

	CategoryVegetable = "vegetable"
	CategoryHerb      = "herb"
	CategoryFlower    = "flower"
	CategoryFruit     = "fruit"
	CategoryTreeShrub = "tree_shrub"
	CategoryCover     = "cover"
)

// User is a pansy account. It may have a local password, OIDC identity, or both.
type User struct {
	ID           int64   `json:"id"`
	Email        string  `json:"email"`
	DisplayName  string  `json:"displayName"`
	PasswordHash *string `json:"-"` // never serialized
	OIDCIssuer   *string `json:"-"`
	OIDCSubject  *string `json:"-"`
	IsAdmin      bool    `json:"isAdmin"`
	Version      int64   `json:"version"`
	CreatedAt    string  `json:"createdAt"`
	UpdatedAt    string  `json:"updatedAt"`
}

// Session is a server-side session record. The raw token is never stored; only
// its sha256 hash (the primary key) is.
type Session struct {
	TokenHash string `json:"-"`
	UserID    int64  `json:"userId"`
	ExpiresAt string `json:"expiresAt"`
	CreatedAt string `json:"createdAt"`
}

// Garden is a planning surface owned by one user, at real-world scale (cm).
type Garden struct {
	ID        int64   `json:"id"`
	OwnerID   int64   `json:"ownerId"`
	Name      string  `json:"name"`
	WidthCM   float64 `json:"widthCm"`
	HeightCM  float64 `json:"heightCm"`
	UnitPref  string  `json:"unitPref"`
	Notes     string  `json:"notes"`
	Version   int64   `json:"version"`
	CreatedAt string  `json:"createdAt"`
	UpdatedAt string  `json:"updatedAt"`
}

// GardenShare grants a non-owner user viewer or editor access to a garden.
type GardenShare struct {
	ID        int64  `json:"id"`
	GardenID  int64  `json:"gardenId"`
	UserID    int64  `json:"userId"`
	Role      string `json:"role"`
	CreatedBy int64  `json:"createdBy"`
	Version   int64  `json:"version"`
	CreatedAt string `json:"createdAt"`
	UpdatedAt string `json:"updatedAt"`
}

// GardenObject is any placeable object in a garden (bed, container, tree, path…).
// Positioned by center point + rotation about center, in garden space.
type GardenObject struct {
	ID          int64    `json:"id"`
	GardenID    int64    `json:"gardenId"`
	Kind        string   `json:"kind"`
	Name        string   `json:"name"`
	Shape       string   `json:"shape"`
	Points      *string  `json:"points,omitempty"` // reserved: JSON for polygons
	XCM         float64  `json:"xCm"`
	YCM         float64  `json:"yCm"`
	WidthCM     float64  `json:"widthCm"`
	HeightCM    float64  `json:"heightCm"`
	RotationDeg float64  `json:"rotationDeg"`
	ZIndex      int      `json:"zIndex"`
	Plantable   bool     `json:"plantable"`
	Color       *string  `json:"color,omitempty"`
	Props       *string  `json:"props,omitempty"` // kind-specific JSON
	Notes       string   `json:"notes"`
	Version     int64    `json:"version"`
	CreatedAt   string   `json:"createdAt"`
	UpdatedAt   string   `json:"updatedAt"`
}

// Plant is a catalog entry. OwnerID nil means a read-only seeded built-in.
type Plant struct {
	ID             int64   `json:"id"`
	OwnerID        *int64  `json:"ownerId,omitempty"` // nil = built-in
	Name           string  `json:"name"`
	Category       string  `json:"category"`
	SpacingCM      float64 `json:"spacingCm"`
	Color          string  `json:"color"`
	Icon           string  `json:"icon"`
	DaysToMaturity *int    `json:"daysToMaturity,omitempty"`
	Notes          string  `json:"notes"`
	Version        int64   `json:"version"`
	CreatedAt      string  `json:"createdAt"`
	UpdatedAt      string  `json:"updatedAt"`
}

// Planting ("plop") is a circular patch of one plant, positioned in its parent
// object's local frame. Count nil means it is derived from area / spacing².
type Planting struct {
	ID        int64    `json:"id"`
	ObjectID  int64    `json:"objectId"`
	PlantID   int64    `json:"plantId"`
	XCM       float64  `json:"xCm"`
	YCM       float64  `json:"yCm"`
	RadiusCM  float64  `json:"radiusCm"`
	Count     *int     `json:"count,omitempty"` // nil = derived
	Label     *string  `json:"label,omitempty"`
	PlantedAt *string  `json:"plantedAt,omitempty"`
	RemovedAt *string  `json:"removedAt,omitempty"`
	Version   int64    `json:"version"`
	CreatedAt string   `json:"createdAt"`
	UpdatedAt string   `json:"updatedAt"`
}