package models

import (
	"strconv"
	"time"

	"gorm.io/gorm"
)

// The origins of an auto-link phrase: entered in the admin, added from a
// record's focus keyphrase, or created through MCP.
const (
	AutolinkOriginManual    = "manual"
	AutolinkOriginKeyphrase = "keyphrase"
	AutolinkOriginMCP       = "mcp"
)

// AutolinkOrigins lists the origins in filter order.
var AutolinkOrigins = []string{AutolinkOriginManual, AutolinkOriginKeyphrase, AutolinkOriginMCP}

// The limits of an auto-link phrase and of the settings' autolink_max
// (UI-SPEC C20, C22).
const (
	MinAutolinkPhrase  = 3
	MaxAutolinkPhrase  = 200
	MaxAutolinkURL     = 2048
	DefaultAutolinkMax = 3
	MinAutolinkMax     = 0
	MaxAutolinkMax     = 20
)

// Autolink is one phrase of the auto-link table on golem15_seo_autolinks
// (D-82, P33-45): texts link the phrase's first occurrence to URL (a path
// or an absolute http(s) address). Locale is the content locale it applies
// in, "" for every locale; a disabled phrase is kept but never linked.
type Autolink struct {
	ID        uint       `gorm:"column:id;primaryKey"`
	Phrase    string     `gorm:"column:phrase"`
	URL       string     `gorm:"column:url"`
	Locale    string     `gorm:"column:locale"`
	Enabled   bool       `gorm:"column:enabled"`
	Origin    string     `gorm:"column:origin"`
	Note      string     `gorm:"column:note"`
	CreatedAt *time.Time `gorm:"column:created_at"`
	UpdatedAt *time.Time `gorm:"column:updated_at"`
}

func (Autolink) TableName() string { return "golem15_seo_autolinks" }

// MorphName names an auto-link in history and the admin.
func (Autolink) MorphName() string { return `Golem15\SEO\Models\Autolink` }

// Fillable lists the form's columns.
func (*Autolink) Fillable() []string {
	return []string{"phrase", "url", "locale", "enabled", "note"}
}

// Rules is empty: the Auto-links controller and the service check a
// phrase before a save (classes.AutolinkProblems).
func (*Autolink) Rules() map[string]string { return map[string]string{} }

// NewAutolink is a phrase with the form's defaults: every locale, active,
// entered by hand.
func NewAutolink() Autolink {
	return Autolink{Enabled: true, Origin: AutolinkOriginManual}
}

// IDText is the auto-link's id as text.
func (a Autolink) IDText() string { return strconv.FormatUint(uint64(a.ID), 10) }

// The filter scopes of the Auto-links list (UI-SPEC C22).
const (
	FilterAutolinkLocale = "FilterAutolinkLocale"
	FilterAutolinkOrigin = "FilterAutolinkOrigin"
	// AutolinkLocaleAll is the locale filter's value of the phrases that
	// apply in every locale.
	AutolinkLocaleAll = "all"
)

// FilterScopes lists the Auto-links list's filter scopes.
func (Autolink) FilterScopes() []string {
	return []string{FilterAutolinkLocale, FilterAutolinkOrigin}
}

// FilterScope narrows the Auto-links list by locale ("all" for the
// phrases of every locale) or origin; an unknown origin matches nothing.
// The active filter is a switch on the enabled column.
func (Autolink) FilterScope(name string, db *gorm.DB, value any) *gorm.DB {
	if db == nil {
		return db
	}
	switch name {
	case FilterAutolinkLocale:
		s, _ := value.(string)
		if s == AutolinkLocaleAll {
			s = ""
		}
		return db.Where("golem15_seo_autolinks.locale = ?", s)
	case FilterAutolinkOrigin:
		s, _ := value.(string)
		for _, o := range AutolinkOrigins {
			if o == s {
				return db.Where("golem15_seo_autolinks.origin = ?", s)
			}
		}
		return db.Where("1 = 0")
	}
	return db
}

func init() {
	Register(Autolink{})
}