// Copyright (c) 2026 Storm Dragon
// SPDX-License-Identifier: GPL-3.0-or-later
package wine

import (
	"context"
	"errors"
	"git.stormux.org/storm/cthulhu/internal/atspi"
	"github.com/godbus/dbus/v5"
	"time"
)

func (r *ReviewRegistry) Capture(parent context.Context, id atspi.ObjectID) (*atspi.AccessibleTree, error) {
	if !IsReviewID(id) {
		return nil, ErrReviewUnavailable
	}
	ctx, cancel := context.WithTimeout(parent, 500*time.Millisecond)
	defer cancel()
	select {
	case r.captureGate <- struct{}{}:
		defer func() { <-r.captureGate }()
	case <-ctx.Done():
		return nil, ctx.Err()
	}
	for attempt := 0; attempt < 2; attempt++ {
		r.mutex.Lock()
		p := r.providers[id.BusName]
		if p == nil || p.ctx.Err() != nil || p.notice.ID() != id {
			r.mutex.Unlock()
			return nil, ErrReviewUnavailable
		}
		notice, lifetime, connection, call := p.notice, p.ctx, r.service, r.captureCall
		r.mutex.Unlock()
		if connection == nil && call == nil {
			return nil, ErrReviewUnavailable
		}
		callCtx, callCancel := context.WithCancel(ctx)
		stop := context.AfterFunc(lifetime, callCancel)
		var fields map[string]dbus.Variant
		var err error
		if call != nil {
			fields, err = call(callCtx, id.BusName, notice.Path, notice)
		} else {
			reply := connection.Object(id.BusName, notice.Path).CallWithContext(callCtx, ReviewInterface+".CaptureWindow", 0, notice.Window, notice.Focus, notice.Revision)
			err = reply.Err
			if err == nil {
				// Store rebuilds variants from their decoded Go values and loses
				// tuple signatures. Validate the original owned reply body.
				if len(reply.Body) != 1 {
					err = ErrReviewInvalid
				} else {
					var ok bool
					fields, ok = reply.Body[0].(map[string]dbus.Variant)
					if !ok {
						err = ErrReviewInvalid
					}
				}
			}
		}
		stop()
		callCancel()
		if err != nil {
			return nil, err
		}
		if ctx.Err() != nil {
			return nil, ctx.Err()
		}
		snapshot, err := DecodeReviewSnapshot(fields)
		if errors.Is(err, ErrReviewStale) && attempt == 0 {
			continue
		}
		if err != nil {
			return nil, err
		}
		if snapshot.Instance != notice.Instance || snapshot.Window != notice.Window || snapshot.Focus != notice.Focus || snapshot.Revision != notice.Revision || snapshot.Bounds != notice.Bounds {
			return nil, ErrReviewStale
		}
		r.mutex.Lock()
		if r.providers[id.BusName] != p || p.notice != notice || lifetime.Err() != nil {
			r.mutex.Unlock()
			return nil, ErrReviewStale
		}
		tree, _, err := ApplyReviewSnapshot(p.trees[notice.Window], snapshot, id.BusName)
		if err == nil {
			p.trees[notice.Window] = tree
		}
		r.mutex.Unlock()
		return tree, err
	}
	return nil, ErrReviewStale
}