package projection

import (
	"github.com/lib/pq"

	"github.com/caos/zitadel/internal/eventstore"
	"github.com/caos/zitadel/internal/eventstore/handler"
	"github.com/caos/zitadel/internal/eventstore/handler/crdb"
	"github.com/caos/zitadel/internal/repository/member"
)

const (
	MemberUserIDCol = "user_id"
	MemberRolesCol  = "roles"

	MemberCreationDate  = "creation_date"
	MemberChangeDate    = "change_date"
	MemberSequence      = "sequence"
	MemberResourceOwner = "resource_owner"
	MemberInstanceID    = "instance_id"
)

var (
	memberColumns = []*crdb.Column{
		crdb.NewColumn(MemberCreationDate, crdb.ColumnTypeTimestamp),
		crdb.NewColumn(MemberChangeDate, crdb.ColumnTypeTimestamp),
		crdb.NewColumn(MemberUserIDCol, crdb.ColumnTypeText),
		crdb.NewColumn(MemberRolesCol, crdb.ColumnTypeTextArray, crdb.Nullable()),
		crdb.NewColumn(MemberSequence, crdb.ColumnTypeInt64),
		crdb.NewColumn(MemberResourceOwner, crdb.ColumnTypeText),
		crdb.NewColumn(MemberInstanceID, crdb.ColumnTypeText),
	}
)

type reduceMemberConfig struct {
	cols  []handler.Column
	conds []handler.Condition
}

type reduceMemberOpt func(reduceMemberConfig) reduceMemberConfig

func withMemberCol(col string, value interface{}) reduceMemberOpt {
	return func(opt reduceMemberConfig) reduceMemberConfig {
		opt.cols = append(opt.cols, handler.NewCol(col, value))
		return opt
	}
}

func withMemberCond(cond string, value interface{}) reduceMemberOpt {
	return func(opt reduceMemberConfig) reduceMemberConfig {
		opt.conds = append(opt.conds, handler.NewCond(cond, value))
		return opt
	}
}

func reduceMemberAdded(e member.MemberAddedEvent, opts ...reduceMemberOpt) (*handler.Statement, error) {
	config := reduceMemberConfig{
		cols: []handler.Column{
			handler.NewCol(MemberUserIDCol, e.UserID),
			handler.NewCol(MemberRolesCol, pq.StringArray(e.Roles)),
			handler.NewCol(MemberCreationDate, e.CreationDate()),
			handler.NewCol(MemberChangeDate, e.CreationDate()),
			handler.NewCol(MemberSequence, e.Sequence()),
			handler.NewCol(MemberResourceOwner, e.Aggregate().ResourceOwner),
			handler.NewCol(MemberInstanceID, e.Aggregate().InstanceID),
		}}

	for _, opt := range opts {
		config = opt(config)
	}

	return crdb.NewCreateStatement(&e, config.cols), nil
}

func reduceMemberChanged(e member.MemberChangedEvent, opts ...reduceMemberOpt) (*handler.Statement, error) {
	config := reduceMemberConfig{
		cols: []handler.Column{
			handler.NewCol(MemberRolesCol, pq.StringArray(e.Roles)),
			handler.NewCol(MemberChangeDate, e.CreationDate()),
			handler.NewCol(MemberSequence, e.Sequence()),
		},
		conds: []handler.Condition{
			handler.NewCond(MemberUserIDCol, e.UserID),
		}}

	for _, opt := range opts {
		config = opt(config)
	}

	return crdb.NewUpdateStatement(&e, config.cols, config.conds), nil
}

func reduceMemberCascadeRemoved(e member.MemberCascadeRemovedEvent, opts ...reduceMemberOpt) (*handler.Statement, error) {
	config := reduceMemberConfig{
		conds: []handler.Condition{
			handler.NewCond(MemberUserIDCol, e.UserID),
		}}

	for _, opt := range opts {
		config = opt(config)
	}
	return crdb.NewDeleteStatement(&e, config.conds), nil
}

func reduceMemberRemoved(e eventstore.Event, opts ...reduceMemberOpt) (*handler.Statement, error) {
	config := reduceMemberConfig{
		conds: []handler.Condition{},
	}

	for _, opt := range opts {
		config = opt(config)
	}
	return crdb.NewDeleteStatement(e, config.conds), nil
}