// Package testcontract 在回归中校验实际报文与公开 Schema，服务二进制不依赖此包。
package testcontract

import (
	"strings"
	"sync"
	"testing"

	"git.yuntuo.hk/k2safe/orbit/protocol/eventsv1"
	"github.com/santhosh-tekuri/jsonschema/v6"
)

var eventOnce sync.Once
var eventSchemas map[string]*jsonschema.Schema
var eventError error

// EventSchema 编译并缓存两个方向的 Schema；开启 date-time 等格式断言。
func EventSchema(t testing.TB, direction string) *jsonschema.Schema {
	t.Helper()
	eventOnce.Do(func() {
		compiler := jsonschema.NewCompiler()
		compiler.AssertFormat()
		doc, err := jsonschema.UnmarshalJSON(strings.NewReader(eventsv1.Schema))
		if err != nil {
			eventError = err
			return
		}
		const resource = "https://git.yuntuo.hk/k2safe/orbit/schema/events.v1.json"
		if err := compiler.AddResource(resource, doc); err != nil {
			eventError = err
			return
		}
		eventSchemas = make(map[string]*jsonschema.Schema)
		for _, side := range []string{"client", "server"} {
			eventSchemas[side], eventError = compiler.Compile(resource + "#/$defs/" + side + "Frame")
			if eventError != nil {
				return
			}
		}
	})
	if eventError != nil {
		t.Fatal(eventError)
	}
	schema := eventSchemas[direction]
	if schema == nil {
		t.Fatal("unknown Event protocol direction")
	}
	return schema
}

// EventFrame 验证真实传输的 JSON，不在错误中输出可能包含秘密的报文正文。
func EventFrame(t testing.TB, direction string, raw []byte) {
	t.Helper()
	value, err := jsonschema.UnmarshalJSON(strings.NewReader(string(raw)))
	if err != nil {
		t.Fatal("Event frame is not valid JSON")
	}
	if EventSchema(t, direction).Validate(value) != nil {
		t.Fatalf("%s Event frame violates published Schema", direction)
	}
}