package model

import (
	"encoding/json"
	"time"
)

// Parameter type constants for ParameterSchema.Type.
const (
	ParamTypeString    = "string"
	ParamTypeInteger   = "integer"
	ParamTypeEnum      = "enum"
	ParamTypeFile      = "file"
	ParamTypeDirectory = "directory"
	ParamTypeBoolean   = "boolean"
)

// Application represents a parameterized application definition for HPC job submission.
type Application struct {
	ID             int64           `gorm:"primaryKey;autoIncrement" json:"id"`
	Name           string          `gorm:"uniqueIndex;size:255;not null" json:"name"`
	Description    string          `gorm:"type:text" json:"description,omitempty"`
	Icon           string          `gorm:"size:255" json:"icon,omitempty"`
	Category       string          `gorm:"size:255" json:"category,omitempty"`
	ScriptTemplate string          `gorm:"type:text;not null" json:"script_template"`
	Parameters     json.RawMessage `gorm:"type:json" json:"parameters,omitempty"`
	Scope          string          `gorm:"size:50;default:'system'" json:"scope,omitempty"`
	CreatedBy      int64           `json:"created_by,omitempty"`
	CreatedAt      time.Time       `json:"created_at"`
	UpdatedAt      time.Time       `json:"updated_at"`
}

func (Application) TableName() string {
	return "hpc_applications"
}

// ParameterSchema defines a single parameter in an application's form schema.
type ParameterSchema struct {
	Name        string   `json:"name"`
	Label       string   `json:"label,omitempty"`
	Type        string   `json:"type"`
	Required    bool     `json:"required,omitempty"`
	Default     string   `json:"default,omitempty"`
	Options     []string `json:"options,omitempty"`
	Description string   `json:"description,omitempty"`
}

// CreateApplicationRequest is the DTO for creating a new application.
type CreateApplicationRequest struct {
	Name           string          `json:"name" binding:"required"`
	Description    string          `json:"description,omitempty"`
	Icon           string          `json:"icon,omitempty"`
	Category       string          `json:"category,omitempty"`
	ScriptTemplate string          `json:"script_template" binding:"required"`
	Parameters     json.RawMessage `json:"parameters,omitempty"`
	Scope          string          `json:"scope,omitempty"`
}

// UpdateApplicationRequest is the DTO for updating an existing application.
// All fields are optional. Parameters uses *json.RawMessage to distinguish
// between "not provided" (nil) and "set to empty" (non-nil).
type UpdateApplicationRequest struct {
	Name           *string          `json:"name,omitempty"`
	Description    *string          `json:"description,omitempty"`
	Icon           *string          `json:"icon,omitempty"`
	Category       *string          `json:"category,omitempty"`
	ScriptTemplate *string          `json:"script_template,omitempty"`
	Parameters     *json.RawMessage `json:"parameters,omitempty"`
	Scope          *string          `json:"scope,omitempty"`
}

// ApplicationSubmitRequest is the DTO for submitting a job from an application.
// ApplicationID is parsed from the URL :id parameter, not included in the body.
type ApplicationSubmitRequest struct {
	Values map[string]string `json:"values" binding:"required"`
}