package response_test

import (
	"bytes"
	"encoding/json"
	"math"
	"os"
	"path/filepath"
	"strconv"
	"testing"

	"git.yuntuo.hk/k2safe/go-omni/config"
	"git.yuntuo.hk/k2safe/go-omni/response"
)

func TestCodeTypeWidthsAndWireValues(t *testing.T) {
	for _, tc := range []struct {
		kind     string
		min, max int64
	}{
		{"int32", math.MinInt32, math.MaxInt32}, {"int64", math.MinInt64, math.MaxInt64},
		{"integer", -9007199254740991, 9007199254740991},
	} {
		t.Run(tc.kind, func(t *testing.T) {
			cfg := response.Config{CodeType: tc.kind, SuccessCode: tc.max, ErrorCode: tc.min, Codes: map[string]any{"ZERO": 0}}
			formatter, err := response.New(cfg)
			if err != nil {
				t.Fatal(err)
			}
			for _, sample := range []struct {
				result response.Result
				want   int64
			}{
				{response.Result{Status: 200, Code: "OK"}, tc.max},
				{response.Result{Status: 500, Code: "INTERNAL"}, tc.min},
				{response.Result{Status: 409, Code: "ZERO"}, 0},
			} {
				payload, err := formatter.Encode(sample.result)
				if err != nil {
					t.Fatal(err)
				}
				decoder := json.NewDecoder(bytes.NewReader(payload.Body))
				decoder.UseNumber()
				var body map[string]any
				if err = decoder.Decode(&body); err != nil {
					t.Fatal(err)
				}
				code, ok := body["code"].(json.Number)
				if !ok || code.String() != strconv.FormatInt(sample.want, 10) {
					t.Fatalf("precision/type lost: %s", payload.Body)
				}
			}
		})
	}
	for _, tc := range []struct {
		kind  string
		value any
	}{
		{"int32", int64(math.MaxInt32) + 1}, {"int32", int64(math.MinInt32) - 1},
		{"int64", json.Number("9223372036854775808")}, {"int64", json.Number("-9223372036854775809")},
		{"int64", uint64(math.MaxUint64)}, {"int64", float64(math.MaxInt64)},
		{"int32", 1.5}, {"int64", json.Number("1.5")}, {"int64", "200"},
		{"string", 200},
	} {
		for _, field := range []string{"successCode", "errorCode", "codes"} {
			cfg := response.Config{CodeType: tc.kind, SuccessCode: 0, ErrorCode: 1}
			if tc.kind == "string" {
				cfg.SuccessCode = "OK"
				cfg.ErrorCode = "ERROR"
			}
			switch field {
			case "successCode":
				cfg.SuccessCode = tc.value
			case "errorCode":
				cfg.ErrorCode = tc.value
			case "codes":
				cfg.Codes = map[string]any{"MAPPED": tc.value}
			}
			if _, err := response.New(cfg); err == nil {
				t.Fatalf("%s %s accepted %#v", tc.kind, field, tc.value)
			}
		}
	}
	for _, kind := range []string{"int32", "int64"} {
		if _, err := response.New(response.Config{CodeType: kind}); err == nil {
			t.Fatalf("%s accepted missing numeric fallbacks", kind)
		}
	}
	f := response.MustNew(response.Config{CodeType: "string", SuccessCode: "SUCCESS", ErrorCode: "ERROR", Codes: map[string]any{"DENIED": "403"}})
	if got := f.Value(response.Result{Status: 403, Code: "DENIED"})["code"]; got != "403" {
		t.Fatal(got)
	}
}

func TestInt64CodesFromConfigurationKeepPrecision(t *testing.T) {
	for ext, body := range map[string]string{
		"json": `{"response":{"codeType":"int64","successCode":9223372036854775807,"errorCode":-9223372036854775808,"codes":{"EXACT":9007199254740993}}}`,
		"yaml": "response:\n  codeType: int64\n  successCode: 9223372036854775807\n  errorCode: -9223372036854775808\n  codes:\n    EXACT: 9007199254740993\n",
	} {
		path := filepath.Join(t.TempDir(), "config."+ext)
		if err := os.WriteFile(path, []byte(body), 0600); err != nil {
			t.Fatal(err)
		}
		cfg, err := config.LoadFile(path)
		if err != nil {
			t.Fatalf("%s: %v", ext, err)
		}
		f := response.MustNew(cfg.Response)
		if f.Config().SuccessCode != int64(math.MaxInt64) || f.Config().ErrorCode != int64(math.MinInt64) || f.Config().Codes["EXACT"] != int64(9007199254740993) {
			t.Fatalf("%s: precision lost: %#v", ext, f.Config())
		}
	}
	var cfg response.Config
	if err := json.Unmarshal([]byte(`{"codeType":"int64","successCode":9223372036854775807,"errorCode":0}`), &cfg); err != nil {
		t.Fatal(err)
	}
	if response.MustNew(cfg).Config().SuccessCode != int64(math.MaxInt64) {
		t.Fatal("json.Unmarshal lost precision")
	}
	if err := json.Unmarshal([]byte(`{"unknownOption":1}`), &cfg); err == nil {
		t.Fatal("custom decoder bypassed unknown-field validation")
	}
}