package autocode

import (
	"bytes"
	"go/ast"
	"go/parser"
	"go/token"
	"strings"
	"testing"
)

// TestWireProviderAst_Parse 测试 WireProviderAst 解析功能
func TestWireProviderAst_Parse(t *testing.T) {
	// 创建测试用的 Go 代码
	testCode := `package biz

import "github.com/google/wire"

var ProviderSet = wire.NewSet(NewUserUsecase)
`
	// 创建临时文件
	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, "test.go", testCode, parser.ParseComments)
	if err != nil {
		t.Fatalf("解析测试代码失败: %v", err)
	}

	if file == nil {
		t.Fatal("解析结果为空")
	}

	if file.Name.Name != "biz" {
		t.Errorf("包名应为 'biz', 实际为 '%s'", file.Name.Name)
	}
}

// TestWireProviderAst_Injection 测试 WireProviderAst 注入功能
func TestWireProviderAst_Injection(t *testing.T) {
	testCode := `package biz

import "github.com/google/wire"

var ProviderSet = wire.NewSet(NewUserUsecase)
`
	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, "test.go", testCode, parser.ParseComments)
	if err != nil {
		t.Fatalf("解析测试代码失败: %v", err)
	}

	// 创建注入器
	injector := &WireProviderAst{
		Layer:        "biz",
		PackageName:  "article",
		ProviderName: "NewArticleUsecase",
		Path:         "test.go",
	}

	// 执行注入
	err = injector.Injection(file)
	if err != nil {
		t.Fatalf("注入失败: %v", err)
	}

	// 验证注入结果
	var found bool
	ast.Inspect(file, func(node ast.Node) bool {
		if genDecl, ok := node.(*ast.GenDecl); ok && genDecl.Tok == token.VAR {
			for _, spec := range genDecl.Specs {
				if valueSpec, ok := spec.(*ast.ValueSpec); ok {
					for i, name := range valueSpec.Names {
						if name.Name == "ProviderSet" && i < len(valueSpec.Values) {
							if callExpr, ok := valueSpec.Values[i].(*ast.CallExpr); ok {
								for _, arg := range callExpr.Args {
									if ident, ok := arg.(*ast.Ident); ok && ident.Name == "NewArticleUsecase" {
										found = true
										return false
									}
								}
							}
						}
					}
				}
			}
		}
		return true
	})

	if !found {
		t.Error("注入后应包含 NewArticleUsecase Provider")
	}
}

// TestWireProviderAst_Injection_Duplicate 测试重复注入不会添加重复项
func TestWireProviderAst_Injection_Duplicate(t *testing.T) {
	testCode := `package biz

import "github.com/google/wire"

var ProviderSet = wire.NewSet(NewUserUsecase, NewArticleUsecase)
`
	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, "test.go", testCode, parser.ParseComments)
	if err != nil {
		t.Fatalf("解析测试代码失败: %v", err)
	}

	injector := &WireProviderAst{
		Layer:        "biz",
		PackageName:  "article",
		ProviderName: "NewArticleUsecase",
		Path:         "test.go",
	}

	// 执行注入（应该不会添加重复项）
	err = injector.Injection(file)
	if err != nil {
		t.Fatalf("注入失败: %v", err)
	}

	// 统计 NewArticleUsecase 出现次数
	count := 0
	ast.Inspect(file, func(node ast.Node) bool {
		if genDecl, ok := node.(*ast.GenDecl); ok && genDecl.Tok == token.VAR {
			for _, spec := range genDecl.Specs {
				if valueSpec, ok := spec.(*ast.ValueSpec); ok {
					for i, name := range valueSpec.Names {
						if name.Name == "ProviderSet" && i < len(valueSpec.Values) {
							if callExpr, ok := valueSpec.Values[i].(*ast.CallExpr); ok {
								for _, arg := range callExpr.Args {
									if ident, ok := arg.(*ast.Ident); ok && ident.Name == "NewArticleUsecase" {
										count++
									}
								}
							}
						}
					}
				}
			}
		}
		return true
	})

	if count != 1 {
		t.Errorf("NewArticleUsecase 应该只出现 1 次, 实际出现 %d 次", count)
	}
}

// TestWireProviderAst_Rollback 测试 WireProviderAst 回滚功能
func TestWireProviderAst_Rollback(t *testing.T) {
	testCode := `package biz

import "github.com/google/wire"

var ProviderSet = wire.NewSet(NewUserUsecase, NewArticleUsecase)
`
	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, "test.go", testCode, parser.ParseComments)
	if err != nil {
		t.Fatalf("解析测试代码失败: %v", err)
	}

	injector := &WireProviderAst{
		Layer:        "biz",
		PackageName:  "article",
		ProviderName: "NewArticleUsecase",
		Path:         "test.go",
	}

	// 执行回滚
	err = injector.Rollback(file)
	if err != nil {
		t.Fatalf("回滚失败: %v", err)
	}

	// 验证回滚结果
	var found bool
	ast.Inspect(file, func(node ast.Node) bool {
		if genDecl, ok := node.(*ast.GenDecl); ok && genDecl.Tok == token.VAR {
			for _, spec := range genDecl.Specs {
				if valueSpec, ok := spec.(*ast.ValueSpec); ok {
					for i, name := range valueSpec.Names {
						if name.Name == "ProviderSet" && i < len(valueSpec.Values) {
							if callExpr, ok := valueSpec.Values[i].(*ast.CallExpr); ok {
								for _, arg := range callExpr.Args {
									if ident, ok := arg.(*ast.Ident); ok && ident.Name == "NewArticleUsecase" {
										found = true
										return false
									}
								}
							}
						}
					}
				}
			}
		}
		return true
	})

	if found {
		t.Error("回滚后不应包含 NewArticleUsecase Provider")
	}
}

// TestWireProviderAst_Format 测试 WireProviderAst 格式化输出
func TestWireProviderAst_Format(t *testing.T) {
	testCode := `package biz

import "github.com/google/wire"

var ProviderSet = wire.NewSet(NewUserUsecase)
`
	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, "test.go", testCode, parser.ParseComments)
	if err != nil {
		t.Fatalf("解析测试代码失败: %v", err)
	}

	injector := &WireProviderAst{
		Layer:        "biz",
		PackageName:  "article",
		ProviderName: "NewArticleUsecase",
		Path:         "test.go",
	}

	// 注入后格式化
	_ = injector.Injection(file)

	var buf bytes.Buffer
	err = injector.Format("", &buf, file)
	if err != nil {
		t.Fatalf("格式化失败: %v", err)
	}

	result := buf.String()
	if !strings.Contains(result, "NewArticleUsecase") {
		t.Error("格式化输出应包含 NewArticleUsecase")
	}
	if !strings.Contains(result, "package biz") {
		t.Error("格式化输出应包含 package biz")
	}
}

// TestMainProviderSetAst_Injection 测试 MainProviderSetAst 注入功能
func TestMainProviderSetAst_Injection(t *testing.T) {
	testCode := `package biz

import (
	"github.com/google/wire"
	"kra/internal/biz/user"
)

var ProviderSet = wire.NewSet(user.NewUserUsecase)
`
	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, "test.go", testCode, parser.ParseComments)
	if err != nil {
		t.Fatalf("解析测试代码失败: %v", err)
	}

	injector := &MainProviderSetAst{
		Layer:        "biz",
		PackageName:  "article",
		ProviderName: "NewArticleUsecase",
		ImportPath:   "kra/internal/biz/article",
		Path:         "test.go",
	}

	// 执行注入
	err = injector.Injection(file)
	if err != nil {
		t.Fatalf("注入失败: %v", err)
	}

	// 验证导入是否添加 - 检查 import 声明中是否包含新导入
	var importFound bool
	ast.Inspect(file, func(node ast.Node) bool {
		if genDecl, ok := node.(*ast.GenDecl); ok && genDecl.Tok == token.IMPORT {
			for _, spec := range genDecl.Specs {
				if impSpec, ok := spec.(*ast.ImportSpec); ok {
					if impSpec.Path.Value == "\"kra/internal/biz/article\"" {
						importFound = true
						return false
					}
				}
			}
		}
		return true
	})
	if !importFound {
		t.Error("注入后应包含 kra/internal/biz/article 导入")
	}

	// 验证 Provider 是否添加
	var providerFound bool
	ast.Inspect(file, func(node ast.Node) bool {
		if genDecl, ok := node.(*ast.GenDecl); ok && genDecl.Tok == token.VAR {
			for _, spec := range genDecl.Specs {
				if valueSpec, ok := spec.(*ast.ValueSpec); ok {
					for i, name := range valueSpec.Names {
						if name.Name == "ProviderSet" && i < len(valueSpec.Values) {
							if callExpr, ok := valueSpec.Values[i].(*ast.CallExpr); ok {
								for _, arg := range callExpr.Args {
									if selExpr, ok := arg.(*ast.SelectorExpr); ok {
										if pkgIdent, ok := selExpr.X.(*ast.Ident); ok {
											if pkgIdent.Name == "article" && selExpr.Sel.Name == "NewArticleUsecase" {
												providerFound = true
												return false
											}
										}
									}
								}
							}
						}
					}
				}
			}
		}
		return true
	})

	if !providerFound {
		t.Error("注入后应包含 article.NewArticleUsecase Provider")
	}
}

// TestMainProviderSetAst_Rollback 测试 MainProviderSetAst 回滚功能
func TestMainProviderSetAst_Rollback(t *testing.T) {
	testCode := `package biz

import (
	"github.com/google/wire"
	"kra/internal/biz/user"
	"kra/internal/biz/article"
)

var ProviderSet = wire.NewSet(user.NewUserUsecase, article.NewArticleUsecase)
`
	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, "test.go", testCode, parser.ParseComments)
	if err != nil {
		t.Fatalf("解析测试代码失败: %v", err)
	}

	injector := &MainProviderSetAst{
		Layer:        "biz",
		PackageName:  "article",
		ProviderName: "NewArticleUsecase",
		ImportPath:   "kra/internal/biz/article",
		Path:         "test.go",
	}

	// 执行回滚
	err = injector.Rollback(file)
	if err != nil {
		t.Fatalf("回滚失败: %v", err)
	}

	// 验证导入是否移除 - 检查 import 声明
	var importFound bool
	ast.Inspect(file, func(node ast.Node) bool {
		if genDecl, ok := node.(*ast.GenDecl); ok && genDecl.Tok == token.IMPORT {
			for _, spec := range genDecl.Specs {
				if impSpec, ok := spec.(*ast.ImportSpec); ok {
					if impSpec.Path.Value == "\"kra/internal/biz/article\"" {
						importFound = true
						return false
					}
				}
			}
		}
		return true
	})
	if importFound {
		t.Error("回滚后不应包含 kra/internal/biz/article 导入")
	}

	// 验证 Provider 是否移除
	var providerFound bool
	ast.Inspect(file, func(node ast.Node) bool {
		if genDecl, ok := node.(*ast.GenDecl); ok && genDecl.Tok == token.VAR {
			for _, spec := range genDecl.Specs {
				if valueSpec, ok := spec.(*ast.ValueSpec); ok {
					for i, name := range valueSpec.Names {
						if name.Name == "ProviderSet" && i < len(valueSpec.Values) {
							if callExpr, ok := valueSpec.Values[i].(*ast.CallExpr); ok {
								for _, arg := range callExpr.Args {
									if selExpr, ok := arg.(*ast.SelectorExpr); ok {
										if pkgIdent, ok := selExpr.X.(*ast.Ident); ok {
											if pkgIdent.Name == "article" && selExpr.Sel.Name == "NewArticleUsecase" {
												providerFound = true
												return false
											}
										}
									}
								}
							}
						}
					}
				}
			}
		}
		return true
	})

	if providerFound {
		t.Error("回滚后不应包含 article.NewArticleUsecase Provider")
	}
}

// TestGetLayerMainFile 测试获取层主文件路径
func TestGetLayerMainFile(t *testing.T) {
	testCases := []struct {
		layer    string
		expected string
	}{
		{"biz", "internal/biz/biz.go"},
		{"data", "internal/data/data.go"},
		{"service", "internal/service/service.go"},
		{"handler", "internal/server/handler/enter.go"},
		{"api", "internal/server/handler/enter.go"},
		{"router", "internal/server/router/enter.go"},
		{"unknown", ""},
	}

	for _, tc := range testCases {
		t.Run(tc.layer, func(t *testing.T) {
			result := GetLayerMainFile(tc.layer)
			if result != tc.expected {
				t.Errorf("GetLayerMainFile(%s) = %s, 期望 %s", tc.layer, result, tc.expected)
			}
		})
	}
}

// TestGetLayerImportPath 测试获取层导入路径
func TestGetLayerImportPath(t *testing.T) {
	module := "kra"
	packageName := "article"

	testCases := []struct {
		layer    string
		expected string
	}{
		{"biz", "kra/internal/biz/article"},
		{"data", "kra/internal/data/article"},
		{"service", "kra/internal/service/article"},
		{"handler", "kra/internal/server/handler/article"},
		{"api", "kra/internal/server/handler/article"},
		{"router", "kra/internal/server/router/article"},
		{"unknown", ""},
	}

	for _, tc := range testCases {
		t.Run(tc.layer, func(t *testing.T) {
			result := GetLayerImportPath(module, tc.layer, packageName)
			if result != tc.expected {
				t.Errorf("GetLayerImportPath(%s, %s, %s) = %s, 期望 %s", module, tc.layer, packageName, result, tc.expected)
			}
		})
	}
}

// TestGetProviderName 测试获取 Provider 名称
func TestGetProviderName(t *testing.T) {
	structName := "Article"

	testCases := []struct {
		layer    string
		expected string
	}{
		{"biz", "NewArticleUsecase"},
		{"data", "NewArticleRepo"},
		{"service", "NewArticleService"},
		{"handler", "NewArticleHandler"},
		{"api", "NewArticleHandler"},
		{"router", "NewArticleRouter"},
		{"unknown", ""},
	}

	for _, tc := range testCases {
		t.Run(tc.layer, func(t *testing.T) {
			result := GetProviderName(tc.layer, structName)
			if result != tc.expected {
				t.Errorf("GetProviderName(%s, %s) = %s, 期望 %s", tc.layer, structName, result, tc.expected)
			}
		})
	}
}

// TestAddImport 测试添加导入
func TestAddImport(t *testing.T) {
	testCode := `package main

import "fmt"

func main() {}
`
	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, "test.go", testCode, parser.ParseComments)
	if err != nil {
		t.Fatalf("解析测试代码失败: %v", err)
	}

	// 添加新导入
	addImport(file, "kra/internal/biz/article")

	// 验证导入是否添加 - 检查 import 声明
	var found bool
	ast.Inspect(file, func(node ast.Node) bool {
		if genDecl, ok := node.(*ast.GenDecl); ok && genDecl.Tok == token.IMPORT {
			for _, spec := range genDecl.Specs {
				if impSpec, ok := spec.(*ast.ImportSpec); ok {
					if impSpec.Path.Value == "\"kra/internal/biz/article\"" {
						found = true
						return false
					}
				}
			}
		}
		return true
	})
	if !found {
		t.Error("应该添加 kra/internal/biz/article 导入")
	}
}

// TestAddImport_Duplicate 测试重复添加导入
func TestAddImport_Duplicate(t *testing.T) {
	testCode := `package main

import (
	"fmt"
	"kra/internal/biz/article"
)

func main() {}
`
	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, "test.go", testCode, parser.ParseComments)
	if err != nil {
		t.Fatalf("解析测试代码失败: %v", err)
	}

	initialCount := len(file.Imports)

	// 尝试添加已存在的导入
	addImport(file, "kra/internal/biz/article")

	// 验证导入数量没有增加
	if len(file.Imports) != initialCount {
		t.Errorf("重复添加导入后数量应保持 %d, 实际为 %d", initialCount, len(file.Imports))
	}
}

// TestRemoveImport 测试移除导入
func TestRemoveImport(t *testing.T) {
	testCode := `package main

import (
	"fmt"
	"kra/internal/biz/article"
)

func main() {}
`
	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, "test.go", testCode, parser.ParseComments)
	if err != nil {
		t.Fatalf("解析测试代码失败: %v", err)
	}

	// 移除导入
	removeImport(file, "kra/internal/biz/article")

	// 验证导入是否移除 - 检查 import 声明
	var found bool
	ast.Inspect(file, func(node ast.Node) bool {
		if genDecl, ok := node.(*ast.GenDecl); ok && genDecl.Tok == token.IMPORT {
			for _, spec := range genDecl.Specs {
				if impSpec, ok := spec.(*ast.ImportSpec); ok {
					if impSpec.Path.Value == "\"kra/internal/biz/article\"" {
						found = true
						return false
					}
				}
			}
		}
		return true
	})
	if found {
		t.Error("应该移除 kra/internal/biz/article 导入")
	}
}

// TestNewWireProviderAst 测试创建 WireProviderAst
func TestNewWireProviderAst(t *testing.T) {
	ast := NewWireProviderAst("biz", "article", "NewArticleUsecase", "internal/biz/article/enter.go")

	if ast.Layer != "biz" {
		t.Errorf("Layer 应为 'biz', 实际为 '%s'", ast.Layer)
	}
	if ast.PackageName != "article" {
		t.Errorf("PackageName 应为 'article', 实际为 '%s'", ast.PackageName)
	}
	if ast.ProviderName != "NewArticleUsecase" {
		t.Errorf("ProviderName 应为 'NewArticleUsecase', 实际为 '%s'", ast.ProviderName)
	}
	if ast.Path != "internal/biz/article/enter.go" {
		t.Errorf("Path 应为 'internal/biz/article/enter.go', 实际为 '%s'", ast.Path)
	}
}

// TestNewMainProviderSetAst 测试创建 MainProviderSetAst
func TestNewMainProviderSetAst(t *testing.T) {
	ast := NewMainProviderSetAst("biz", "article", "NewArticleUsecase", "kra/internal/biz/article", "internal/biz/biz.go")

	if ast.Layer != "biz" {
		t.Errorf("Layer 应为 'biz', 实际为 '%s'", ast.Layer)
	}
	if ast.PackageName != "article" {
		t.Errorf("PackageName 应为 'article', 实际为 '%s'", ast.PackageName)
	}
	if ast.ProviderName != "NewArticleUsecase" {
		t.Errorf("ProviderName 应为 'NewArticleUsecase', 实际为 '%s'", ast.ProviderName)
	}
	if ast.ImportPath != "kra/internal/biz/article" {
		t.Errorf("ImportPath 应为 'kra/internal/biz/article', 实际为 '%s'", ast.ImportPath)
	}
	if ast.Path != "internal/biz/biz.go" {
		t.Errorf("Path 应为 'internal/biz/biz.go', 实际为 '%s'", ast.Path)
	}
}

// TestWireProviderAst_Injection_NoProviderSet 测试没有 ProviderSet 时的注入
func TestWireProviderAst_Injection_NoProviderSet(t *testing.T) {
	testCode := `package biz

import "github.com/google/wire"

var SomeOtherVar = "test"
`
	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, "test.go", testCode, parser.ParseComments)
	if err != nil {
		t.Fatalf("解析测试代码失败: %v", err)
	}

	injector := &WireProviderAst{
		Layer:        "biz",
		PackageName:  "article",
		ProviderName: "NewArticleUsecase",
		Path:         "test.go",
	}

	// 执行注入应该返回错误
	err = injector.Injection(file)
	if err == nil {
		t.Error("没有 ProviderSet 时注入应该返回错误")
	}
}

// TestWireInjectionConfig 测试 WireInjectionConfig 结构体
func TestWireInjectionConfig(t *testing.T) {
	config := &WireInjectionConfig{
		Module:      "kra",
		PackageName: "article",
		StructName:  "Article",
		Layers:      []string{"biz", "data", "service", "handler", "router"},
	}

	if config.Module != "kra" {
		t.Errorf("Module 应为 'kra', 实际为 '%s'", config.Module)
	}
	if config.PackageName != "article" {
		t.Errorf("PackageName 应为 'article', 实际为 '%s'", config.PackageName)
	}
	if config.StructName != "Article" {
		t.Errorf("StructName 应为 'Article', 实际为 '%s'", config.StructName)
	}
	if len(config.Layers) != 5 {
		t.Errorf("Layers 长度应为 5, 实际为 %d", len(config.Layers))
	}
}