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// SPDX-FileCopyrightText: 2025 Shota FUJI <pockawoooh@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-only

package projection

import (
	"crypto/rand"
	"database/sql"

	"pocka.jp/x/yamori/backend/core/event"
	"pocka.jp/x/yamori/backend/core/snapshot"
	workspaceEventsv1 "pocka.jp/x/yamori/proto/go/backend/events/workspace/v1"
	workspace "pocka.jp/x/yamori/proto/go/backend/projections/workspace/v1"
)

type LoginJwtSecret struct {
	hasSnapshot bool
	eventSeq    *uint64
	Projection  []byte
}

func NewLoginJwtSecret() *LoginJwtSecret {
	secret := make([]byte, 56)
	rand.Read(secret)

	return &LoginJwtSecret{
		hasSnapshot: false,
		eventSeq:    nil,
		Projection:  secret,
	}
}

func GetLoginJwtSecret(tx *sql.Tx) (*LoginJwtSecret, error) {
	payload, seq, err := snapshot.GetLatest[workspace.LoginJwtSecret](tx)
	if err != nil {
		return nil, err
	}

	if payload == nil {
		return NewLoginJwtSecret(), nil
	}

	return &LoginJwtSecret{
		hasSnapshot: true,
		eventSeq:    &seq,
		Projection:  payload.Secret,
	}, nil
}

func (p *LoginJwtSecret) HasSnapshot() bool {
	return p.hasSnapshot
}

func (p *LoginJwtSecret) EventSeq() *uint64 {
	return p.eventSeq
}

func (p *LoginJwtSecret) Update(events []event.Event) {
	if len(events) == 0 || p.Projection == nil {
		return
	}

	for i := range events {
		if p.eventSeq != nil && events[i].Seq <= *p.eventSeq {
			continue
		}

		ev := events[i].Payload.GetWorkspaceEvent()
		if ev == nil {
			continue
		}

		p.hasSnapshot = false

		switch v := ev.Event.(type) {
		case *workspaceEventsv1.Event_LoginJwtSecretConfigured:
			p.Projection = v.LoginJwtSecretConfigured.Secret
		}

		p.eventSeq = &events[i].Seq
	}
}

func (p *LoginJwtSecret) SaveSnapshot(tx *sql.Tx) error {
	if p.hasSnapshot || p.eventSeq == nil {
		return nil
	}

	return snapshot.Save(tx, &workspace.LoginJwtSecret{
		Secret: p.Projection,
	}, *p.eventSeq)
}