package js

import (
	"apigo.cc/ai/ai"
	"apigo.cc/ai/ai/llm"
	"bytes"
	_ "embed"
	"encoding/json"
	"errors"
	"fmt"
	"github.com/dop251/goja"
	"github.com/dop251/goja_nodejs/require"
	"github.com/ssgo/u"
	"path/filepath"
	"regexp"
	"strings"
	"text/template"
)

//go:embed lib/ai.ts
var aiTS string

//go:embed lib/console.ts
var consoleTS string

//go:embed lib/file.ts
var fileTS string

func RunFile(file string, args ...any) (any, error) {
	return Run(u.ReadFileN(file), file, args...)
}

func Run(code string, refFile string, args ...any) (any, error) {
	var r any
	js, err := StartFromCode(code, refFile)
	if err == nil {
		r, err = js.Run(args...)
	}
	return r, err
}

var importModMatcher = regexp.MustCompile(`(?im)^\s*import\s+(.+?)\s+from\s+['"](.+?)['"]`)
var importLibMatcher = regexp.MustCompile(`(?im)^\s*(import)\s+(.+?)\s+from\s+['"][./\\\w:]+lib[/\\](.+?)(\.ts)?['"]`)
var requireLibMatcher = regexp.MustCompile(`(?im)^\s*(const|let|var)\s+(.+?)\s*=\s*require\s*\(\s*['"][./\\\w:]+lib[/\\](.+?)(\.ts)?['"]\s*\)`)
var checkMainMatcher = regexp.MustCompile(`(?im)^\s*function\s+main\s*\(`)

type JS struct {
	vm       *goja.Runtime
	required map[string]bool
	file     string
	srcCode  string
	code     string
}

func (js *JS) requireMod(name string) error {
	var err error
	if name == "console" || name == "" {
		if !js.required["console"] {
			js.required["console"] = true
			err = js.vm.Set("console", requireConsole())
		}
	}
	if err == nil && (name == "file" || name == "") {
		if !js.required["file"] {
			js.required["file"] = true
			err = js.vm.Set("file", requireFile())
		}
	}
	if err == nil && (name == "ai" || name == "") {
		if !js.required["ai"] {
			js.required["ai"] = true
			aiList := make(map[string]any)
			for name, lm := range llm.List() {
				aiList[name] = requireAI(lm)
			}
			err = js.vm.Set("ai", aiList)
		}
	}
	return err
}

func (js *JS) makeImport(matcher *regexp.Regexp, code string) (string, int, error) {
	var modErr error
	importCount := 0
	code = matcher.ReplaceAllStringFunc(code, func(str string) string {
		if m := matcher.FindStringSubmatch(str); m != nil && len(m) > 3 {
			optName := m[1]
			if optName == "import" {
				optName = "let"
			}
			varName := m[2]
			modName := m[3]
			importCount++
			if modErr == nil {
				if err := js.requireMod(modName); err != nil {
					modErr = err
				}
			}
			if varName != modName {
				return fmt.Sprintf("%s %s = %s", optName, varName, modName)
			}
		}
		return ""
	})
	return code, importCount, modErr
}

func StartFromFile(file string) (*JS, error) {
	return StartFromCode(u.ReadFileN(file), file)
}

func StartFromCode(code, refFile string) (*JS, error) {
	if refFile == "" {
		refFile = "main.js"
	}

	if absFile, err := filepath.Abs(refFile); err == nil {
		refFile = absFile
	}

	ai.InitFrom(filepath.Dir(refFile))

	js := &JS{
		vm:       goja.New(),
		required: map[string]bool{},
		file:     refFile,
		srcCode:  code,
		code:     code,
	}

	// 按需加载引用
	var importCount int
	var modErr error
	js.code, importCount, modErr = js.makeImport(importLibMatcher, js.code)
	if modErr == nil {
		importCount1 := importCount
		js.code, importCount, modErr = js.makeImport(requireLibMatcher, js.code)
		importCount += importCount1
	}

	// 将 import 转换为 require
	js.code = importModMatcher.ReplaceAllString(js.code, "let $1 = require('$2')")

	// 如果没有import，默认import所有
	if modErr == nil && importCount == 0 {
		modErr = js.requireMod("")
	}
	if modErr != nil {
		return nil, modErr
	}

	//fmt.Println(u.BCyan(js.code))

	// 处理模块引用
	require.NewRegistryWithLoader(func(path string) ([]byte, error) {
		refPath := filepath.Join(filepath.Dir(js.file), path)
		if !strings.HasSuffix(refPath, ".js") && !u.FileExists(refPath) {
			refPath += ".js"
		}
		modCode, err := u.ReadFile(refPath)
		if err != nil {
			return nil, err
		}
		modCode, _, _ = js.makeImport(importLibMatcher, modCode)
		modCode, _, _ = js.makeImport(requireLibMatcher, modCode)
		return []byte(modCode), modErr
	}).Enable(js.vm)

	// 初始化主函数
	if !checkMainMatcher.MatchString(js.code) {
		js.code = "function main(...args){" + js.code + "}"
	}
	if _, err := js.vm.RunScript("main", js.code); err != nil {
		return nil, err
	}

	return js, nil
}

func (js *JS) Run(args ...any) (any, error) {
	// 解析参数
	for i, arg := range args {
		if str, ok := arg.(string); ok {
			var v interface{}
			if err := json.Unmarshal([]byte(str), &v); err == nil {
				args[i] = v
			}
		}
	}

	if err := js.vm.Set("__args", args); err != nil {
		return nil, err
	}
	jsResult, err := js.vm.RunScript(js.file, "main(...__args)")

	var result any
	if err == nil {
		if jsResult != nil && !jsResult.Equals(goja.Undefined()) {
			result = jsResult.Export()
		}
	}
	return result, err
}

type Exports struct {
	LLMList []string
}

func ExportForDev() (string, error) {
	ai.Init()
	if len(llm.List()) == 0 && !u.FileExists("env.yml") && !u.FileExists("env.json") && !u.FileExists("llm.yml") && !u.FileExists("llm.json") {
		return "", errors.New("no llm config found, please run `ai -e` on env.yml or llm.yml path")
	}
	exports := Exports{}
	for name, _ := range llm.List() {
		exports.LLMList = append(exports.LLMList, name)
	}

	exportFile := filepath.Join("lib", "ai.ts")
	var tpl *template.Template
	var err error
	if tpl, err = template.New(exportFile).Parse(aiTS); err == nil {
		buf := bytes.NewBuffer(make([]byte, 0))
		if err = tpl.Execute(buf, exports); err == nil {
			err = u.WriteFileBytes(exportFile, buf.Bytes())
		}
	}
	if err != nil {
		return "", err
	}

	_ = u.WriteFile(filepath.Join("lib", "console.ts"), consoleTS)
	_ = u.WriteFile(filepath.Join("lib", "file.ts"), fileTS)

	return `import {` + strings.Join(exports.LLMList, ", ") + `} from './lib/ai'
import console from './lib/console'
import file from './lib/file'`, nil
}