package apigen

import (
	"context"
	"encoding/json"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"
	"time"
)

func TestGeneratedConfigurationConsumer(t *testing.T) {
	if os.Getenv("GO_OMNI_SCAFFOLD_INTEGRATION") != "1" {
		t.Skip("set GO_OMNI_SCAFFOLD_INTEGRATION=1")
	}
	dir := filepath.Join(t.TempDir(), "app")
	api := filepath.Join(t.TempDir(), "service.api")
	writeFile(t, api, "service configuration {\n@handler ping\nget /ping\n}\n")
	o := Options{API: api, Dir: dir, Module: "example.com/configuration", FrameworkDir: frameworkRoot(t)}
	if err := generateManagedTestProject(t, o); err != nil {
		t.Fatal(err)
	}
	main := readFile(t, filepath.Join(dir, "main.go"))
	// The business only changes fields/defaults/validation, not the loading flow.
	writeFile(t, filepath.Join(dir, "internal/config/config.go"), `package config
 import("git.yuntuo.hk/k2safe/go-omni/config";"git.yuntuo.hk/k2safe/go-omni/logx")
 type Config struct { Server config.Config `+"`json:\"server\"`"+`;Limit int `+"`json:\"limit\"`"+` }
 func Default()Config{ c:=config.Default();c.Log.File="./var/log/app.log";c.Log.Rotation=logx.RotationConfig{Enabled:true,MaxSizeMB:10};return Config{Server:c,Limit:10} }
 func(c Config)Validate()error{if err:=c.Server.Validate();err!=nil{return config.AtField("server",err)};if c.Limit<0{return config.Invalid("limit","must not be negative")};return nil}
 `)
	writeFile(t, filepath.Join(dir, "internal/config/loader.go"), `package config
 import omniConfig "git.yuntuo.hk/k2safe/go-omni/config"
 func NewLoader()(*omniConfig.Loader,error){return omniConfig.NewLoader(omniConfig.WithDecoder("custom",omniConfig.JSONDecoder{}))}
 `)
	svc := filepath.Join(dir, "internal/svc/serviceContext.go")
	writeFile(t, svc, strings.Replace(readFile(t, svc), "return nil", "panic(\"dependencies must not initialize on invalid config\")", 1))
	writeFile(t, filepath.Join(dir, "consumer_test.go"), readFile(t, "testdata/configuration/consumer_test.go"))
	runConsumerGo(t, dir, "mod", "tidy")
	runConsumerGo(t, dir, "test", "-race", "-count=1", "./...")
	runConsumerGo(t, dir, "build", ".")
	o.API = filepath.Join(dir, "api/service.api")
	before := snapshot(t, dir)
	for _, mode := range []string{"dry", "generate", "check"} {
		o.DryRun = mode == "dry"
		o.Check = mode == "check"
		if err := generateManagedTestProject(t, o); err != nil {
			t.Fatal(err)
		}
	}
	if !sameFiles(before, snapshot(t, dir)) {
		t.Fatal("business files overwritten")
	}
	if main != readFile(t, filepath.Join(dir, "main.go")) {
		t.Fatal("main changed")
	}
	load := filepath.Join(dir, "internal/config/loadGen.go")
	original := readFile(t, load)
	writeFile(t, load, original+"\n// drift\n")
	if err := generateManagedTestProject(t, o); err == nil {
		t.Fatal("loadGen drift accepted")
	}
	writeFile(t, load, original)
	if os.Getenv("GO_OMNI_RELEASE_CLI") != "" {
		ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
		defer cancel()
		cmd := exec.CommandContext(ctx, "go", "list", "-m", "-json", frameworkModule)
		cmd.Dir = dir
		cmd.Env = append(os.Environ(), "GOWORK=off")
		data, err := cmd.CombinedOutput()
		if err != nil {
			t.Fatal(err, string(data))
		}
		var dependency struct {
			Version, Sum string
			Replace      any
		}
		if err = json.Unmarshal(data, &dependency); err != nil {
			t.Fatal(err)
		}
		if dependency.Version != os.Getenv("GO_OMNI_RELEASE_VERSION") || dependency.Replace != nil || dependency.Sum == "" {
			t.Fatal("not a remote consumer")
		}
		t.Logf("remote framework %s checksum %s; no local replace", dependency.Version, dependency.Sum)
	}
}
func TestConfigLoadMigrationGuard(t *testing.T) {
	dir := filepath.Join(t.TempDir(), "app")
	o := Options{Dir: dir, Module: "example.com/upgrade", FrameworkDir: frameworkRoot(t)}
	if _, err := New(o); err != nil {
		t.Fatal(err)
	}
	o.API = filepath.Join(dir, "api/service.api")
	matches, err := filepath.Glob(filepath.Join(dir, "api/*.api"))
	if err != nil || len(matches) != 1 {
		t.Fatal(matches, err)
	}
	o.API = matches[0]
	writeFile(t, filepath.Join(dir, "internal/config/legacy.go"), "package config\nfunc Load(path string)(Config,error){return Default(),nil}\n")
	before := snapshot(t, dir)
	for _, mode := range []string{"dry", "generate", "check"} {
		o.DryRun = mode == "dry"
		o.Check = mode == "check"
		_, err := Generate(o)
		if err == nil || !strings.Contains(err.Error(), "CONFIG.md") {
			t.Fatal("missing migration diagnostic", err)
		}
		if !sameFiles(before, snapshot(t, dir)) {
			t.Fatal("migration guard changed files")
		}
	}
}

func TestRemovedEnvironmentTagsRejectBeforeGeneration(t *testing.T) {
	dir := filepath.Join(t.TempDir(), "app")
	o := Options{Dir: dir, Module: "example.com/migrate", FrameworkDir: frameworkRoot(t)}
	if _, err := New(o); err != nil {
		t.Fatal(err)
	}
	o.API = filepath.Join(dir, "api/service.api")
	path := filepath.Join(dir, "internal/config/config.go")
	source := readFile(t, path)
	writeFile(t, path, strings.Replace(source, "json:\"server\"", "json:\"server\" env:\"OLD_SERVER\"", 1))
	before := snapshot(t, dir)
	for _, mode := range []string{"dry", "generate", "check"} {
		o.DryRun = mode == "dry"
		o.Check = mode == "check"
		if _, err := Generate(o); err == nil || !strings.Contains(err.Error(), "env/envDefault") {
			t.Fatal(err)
		}
		if !sameFiles(before, snapshot(t, dir)) {
			t.Fatal("migration rejection wrote files")
		}
	}
}