// Copyright (c) 2026 Probo Inc <hello@probo.com>.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package checks

import (
	"context"
	"sort"
	"sync"
)

var (
	registryMu sync.Mutex
	registry   []Check
)

// Register adds a check implementation to the process registry.
func Register(key string, run func(context.Context) Result) {
	registryMu.Lock()
	defer registryMu.Unlock()

	registry = append(
		registry,
		funcCheck{
			key: key,
			run: run,
		},
	)
}

// All returns a stable snapshot of registered checks.
func All() []Check {
	registryMu.Lock()
	defer registryMu.Unlock()

	out := make([]Check, len(registry))
	copy(out, registry)
	sort.SliceStable(
		out,
		func(i, j int) bool {
			return out[i].Key() < out[j].Key()
		},
	)

	return out
}