//go:build linux || freebsd
// +build linux freebsd

package hsts

import (
	"encoding/json"
	"os"
	"testing"
)

// FuzzHSTSParseHeader tests HSTS header parsing with fuzzed input.
func FuzzHSTSParseHeader(f *testing.F) {
	f.Add("max-age=31536000")
	f.Add("max-age=31536000; includeSubDomains")
	f.Add("max-age=0")
	f.Add("")
	f.Add("invalid")
	f.Add("max-age=abc")
	f.Add("max-age=31536000; includeSubDomains; preload")
	f.Add("MAX-AGE=31536000")

	f.Fuzz(func(t *testing.T, header string) {
		_, _ = parseHeader(header)
	})
}

// FuzzHSTSLoadSave tests loading and saving HSTS cache with fuzzed data.
func FuzzHSTSLoadSave(f *testing.F) {
	f.Add([]byte(`{}`))
	f.Add([]byte(`{"example.com":{"maxAge":31536000,"includeSubDomains":true,"expires":"2026-01-01T00:00:00Z"}}`))
	f.Add([]byte(`{invalid`))

	f.Fuzz(func(t *testing.T, data []byte) {
		cache := &Cache{
			entries: make(map[string]*Entry),
			path:    t.TempDir() + "/fuzz-hsts.json",
		}

		// Try loading fuzzed JSON
		_ = json.Unmarshal(data, &cache.entries)

		// Save to file must not panic
		tmp := t.TempDir() + "/fuzz-hsts"
		_ = os.WriteFile(tmp, data, 0644)
		err := cache.Load(tmp)
		if err == nil {
			_ = cache.Save()
		}
		os.Remove(tmp)
	})
}