package ldapSync

/*
 this file contains the code for creating the ldapUsers and ldapGroups tables
*/

import (
	"github.com/pocketbase/pocketbase"
	"github.com/pocketbase/pocketbase/forms"
	"github.com/pocketbase/pocketbase/models"
	"github.com/pocketbase/pocketbase/models/schema"
	"github.com/pocketbase/pocketbase/tools/types"
)

const ldapUsersTableName string = "ldap_users"
const ldapGroupsTableName string = "ldap_groups"
const ldapSyncLogsTableName string = "ldap_sync_logs"

// createLDAPGroupsTable creates ldapGroups table
//
// the function does not check if the ldapGroups table already exists
// returns error
func createLDAPGroupsTable(app *pocketbase.PocketBase) error {

	collection := &models.Collection{}

	form := forms.NewCollectionUpsert(app, collection)
	form.Name = ldapGroupsTableName
	form.Type = models.CollectionTypeBase
	form.ListRule = types.Pointer("@request.auth.id != ''")
	form.ViewRule = types.Pointer("@request.auth.id != ''")
	form.CreateRule = nil
	form.UpdateRule = nil
	form.DeleteRule = nil

	// add description field
	form.Schema.AddField(&schema.SchemaField{
		Name:     "description",
		Type:     schema.FieldTypeText,
		Required: false,
	})

	// add common name field
	form.Schema.AddField(&schema.SchemaField{
		Name:        "cn",
		Type:        schema.FieldTypeText,
		Required:    true,
		Presentable: true,
	})

	// add distinguished name field
	form.Schema.AddField(&schema.SchemaField{
		Name:     "dn",
		Type:     schema.FieldTypeText,
		Required: true,
	})

	// create index on cn
	form.Indexes = types.JsonArray[string]{
		"CREATE UNIQUE INDEX idx_ldapGroups ON " + ldapGroupsTableName + " (cn, dn)",
	}

	// validate and submit (internally it calls app.Dao().SaveCollection(collection) in a transaction)
	if err := form.Submit(); err != nil {
		return err
	}

	// find the ldapGroups collection by name
	collection, err := app.Dao().FindCollectionByNameOrId(ldapGroupsTableName)

	if err != nil {
		return err
	}

	// create form for collection update
	form = forms.NewCollectionUpsert(app, collection)

	// add groups field - we cant add this field in the first form because the collection (and the ID) does not exist yet
	form.Schema.AddField(&schema.SchemaField{
		Name:     "memberOf",
		Type:     schema.FieldTypeRelation,
		Required: false,
		Options: &schema.RelationOptions{
			CollectionId:  collection.Id,
			CascadeDelete: false,
		},
	})

	// validate and submit (internally it calls app.Dao().SaveCollection(collection) in a transaction)
	if err := form.Submit(); err != nil {
		return err
	}

	// return collection id and nil error
	return nil
}

// createLDAPUsersTable creates ldapUsers table
//
// the function does not check if the ldapUsers table already exists
// returns error
func createLDAPUsersTable(app *pocketbase.PocketBase) error {

	// find the ldapGroups collection by name
	groupsCollection, err := app.Dao().FindCollectionByNameOrId(ldapGroupsTableName)
	if err != nil {
		return err
	}

	// create ldapUsers table
	collection := &models.Collection{}

	// because this is an auth collection, the system will automatically create a username field, a password field, verified field, an email field and an emailVisibility field

	// create form for collection creation
	form := forms.NewCollectionUpsert(app, collection)
	form.Name = ldapUsersTableName                          // collection name
	form.Type = models.CollectionTypeAuth                   // collection type set to auth, otherwise login will not work
	form.ListRule = types.Pointer("@request.auth.id != ''") // list rule (only authenticated users can list)
	form.ViewRule = types.Pointer("@request.auth.id != ''") // view rule (only authenticated users can view)
	form.CreateRule = nil                                   // create rule (anyone can create)
	form.UpdateRule = nil                                   // update rule (anyone can update)
	form.DeleteRule = nil                                   // delete rule (anyone can delete)

	// add common name field, the collection will also have a field named "username" which is the username field. this field is added automatically by the forms.NewCollectionUpsert() function
	form.Schema.AddField(&schema.SchemaField{
		Name:        "cn",
		Type:        schema.FieldTypeText,
		Required:    true,
		Presentable: true,
	})

	// add distinguished name field
	form.Schema.AddField(&schema.SchemaField{
		Name:     "dn",
		Type:     schema.FieldTypeText,
		Required: true,
	})

	// add surname field
	form.Schema.AddField(&schema.SchemaField{
		Name:     "sn",
		Type:     schema.FieldTypeText,
		Required: true,
	})

	// add given name field
	form.Schema.AddField(&schema.SchemaField{
		Name:     "givenName",
		Type:     schema.FieldTypeText,
		Required: true,
	})

	// add account expires field
	form.Schema.AddField(&schema.SchemaField{
		Name:     "accountExpires",
		Type:     schema.FieldTypeDate,
		Required: false,
	})

	// add groups field
	form.Schema.AddField(&schema.SchemaField{
		Name:     "memberOf",
		Type:     schema.FieldTypeRelation,
		Required: false,
		Options: &schema.RelationOptions{
			CollectionId:  groupsCollection.Id,
			CascadeDelete: false,
		},
	})

	// create index on username
	form.Indexes = types.JsonArray[string]{
		"CREATE UNIQUE INDEX idx_ldapUsers ON " + ldapGroupsTableName + " (cn, dn)",
	}

	return form.Submit()
}

// createLDAPSyncLogsTable creates ldapSyncLogs table
func createLDAPSyncLogsTable(app *pocketbase.PocketBase) error {
	// create ldapSyncs table
	collection := &models.Collection{}

	// create form for collection creation
	form := forms.NewCollectionUpsert(app, collection)
	form.Name = ldapSyncLogsTableName     // collection name
	form.Type = models.CollectionTypeBase // collection type set to auth, otherwise login will not work

	form.Schema.AddField(&schema.SchemaField{
		Name: "usersFound",
		Type: schema.FieldTypeNumber,
	})

	form.Schema.AddField(&schema.SchemaField{
		Name: "usersSynced",
		Type: schema.FieldTypeNumber,
	})

	form.Schema.AddField(&schema.SchemaField{
		Name: "usersRemoved",
		Type: schema.FieldTypeNumber,
	})

	form.Schema.AddField(&schema.SchemaField{
		Name: "userSyncErrors",
		Type: schema.FieldTypeJson,
	})

	form.Schema.AddField(&schema.SchemaField{
		Name: "groupsFound",
		Type: schema.FieldTypeNumber,
	})

	form.Schema.AddField(&schema.SchemaField{
		Name: "groupsSynced",
		Type: schema.FieldTypeNumber,
	})

	form.Schema.AddField(&schema.SchemaField{
		Name: "groupsRemoved",
		Type: schema.FieldTypeNumber,
	})

	form.Schema.AddField(&schema.SchemaField{
		Name: "groupSyncErrors",
		Type: schema.FieldTypeJson,
	})

	// create index
	form.Indexes = types.JsonArray[string]{
		"CREATE UNIQUE INDEX idx_ldapSyncs ON " + ldapSyncLogsTableName + " (created)",
	}

	return form.Submit()
}