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

package projection

import (
	"database/sql"

	"google.golang.org/protobuf/proto"

	"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 Workspace struct {
	hasSnapshot bool
	eventSeq    *uint64
	Projection  *workspace.Workspace
}

func NewWorkspace() *Workspace {
	return &Workspace{
		hasSnapshot: false,
		eventSeq:    nil,
		Projection: &workspace.Workspace{
			NumberOfAdmins: proto.Uint32(0),
		},
	}
}

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

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

	return &Workspace{
		hasSnapshot: true,
		eventSeq:    &seq,
		Projection:  payload,
	}, nil
}

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

func (p *Workspace) 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_AdminAccessGranted:
			p.Projection.NumberOfAdmins = proto.Uint32(*p.Projection.NumberOfAdmins + 1)
		case *workspaceEventsv1.Event_AdminAccessRevoked:
			p.Projection.NumberOfAdmins = proto.Uint32(max(0, *p.Projection.NumberOfAdmins-1))
		case *workspaceEventsv1.Event_WorkspaceDisplayNameSet:
			p.Projection.DisplayName = v.WorkspaceDisplayNameSet.DisplayName
		}

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

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

	return snapshot.Save(tx, p.Projection, *p.eventSeq)
}