package ntfy

import (
	"encoding/json"
	"testing"
)

// FuzzParseMessage tests that JSON unmarshaling doesn't panic on arbitrary input
func FuzzParseMessage(f *testing.F) {
	// Seed corpus with valid messages
	f.Add(`{"event":"message","topic":"test","title":"hello","message":"world"}`)
	f.Add(`{"event":"message","topic":"alerts","priority":5,"tags":["warning"]}`)
	f.Add(`{"event":"keepalive"}`)
	f.Add(`{"event":"open"}`)
	f.Add(`{}`)
	f.Add(`{"id":"abc123","time":1706803200,"expires":1706889600}`)
	f.Add(`{"click":"https://example.com","icon":"https://example.com/icon.png"}`)

	// Edge cases
	f.Add(``)
	f.Add(`null`)
	f.Add(`[]`)
	f.Add(`"string"`)
	f.Add(`123`)
	f.Add(`{"priority":-1}`)
	f.Add(`{"priority":999999999}`)
	f.Add(`{"tags":[]}`)
	f.Add(`{"tags":["","",""]}`)

	f.Fuzz(func(t *testing.T, data string) {
		var msg Message
		// Should never panic regardless of input
		_ = json.Unmarshal([]byte(data), &msg)

		// If it parsed, accessing fields should not panic
		_ = msg.ID
		_ = msg.Event
		_ = msg.Topic
		_ = msg.Title
		_ = msg.Message
		_ = msg.Priority
		_ = msg.Click
		_ = len(msg.Tags)
	})
}

// FuzzParseMessageBytes tests binary input doesn't cause panics
func FuzzParseMessageBytes(f *testing.F) {
	f.Add([]byte(`{"event":"message"}`))
	f.Add([]byte{0x00})
	f.Add([]byte{0xff, 0xfe})
	f.Add([]byte("\xef\xbb\xbf{}")) // BOM + JSON

	f.Fuzz(func(t *testing.T, data []byte) {
		var msg Message
		_ = json.Unmarshal(data, &msg)
	})
}