package service

import (
	"reflect"
	"strings"

	"apigo.cc/gojs"
	"apigo.cc/gojs/goja"
	"github.com/ssgo/discover"
	"github.com/ssgo/httpclient"
	"github.com/ssgo/u"
)

type Caller struct {
	client *discover.Caller
}

func NewCaller(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
	args := gojs.MakeArgs(&argsIn, vm)
	return vm.ToValue(gojs.MakeMap(Caller{client: discover.NewCaller(nil, args.Logger)}))
}

func makeResult(r *httpclient.Result, vm *goja.Runtime) goja.Value {
	if r.Error != nil {
		panic(vm.NewGoError(r.Error))
	}
	headers := map[string]string{}
	for k, v := range r.Response.Header {
		headers[k] = v[0]
	}
	return vm.ToValue(map[string]any{
		"status":     r.Response.Status,
		"statusCode": r.Response.StatusCode,
		"headers":    headers,
		"_data":      r.Bytes(),
		"bytes":      toBytes,
		"string":     toString,
		"object":     toObject,
	})
}

func toBytes(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
	dataValue := argsIn.This.ToObject(vm).Get("_data")
	if _, ok := dataValue.Export().([]byte); ok {
		return dataValue
	}
	return nil
}

func toString(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
	dataValue := argsIn.This.ToObject(vm).Get("_data")
	if data, ok := dataValue.Export().([]byte); ok {
		return vm.ToValue(string(data))
	}
	return nil
}

func toObject(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
	dataValue := argsIn.This.ToObject(vm).Get("_data")
	if data, ok := dataValue.Export().([]byte); ok {
		obj := u.UnJsonBytes(data, nil)
		v := u.FinalValue(reflect.ValueOf(obj))
		if v.IsValid() {
			return vm.ToValue(v.Interface())
		}
	}
	return nil
}

func (cl *Caller) makeHeaderArray(in map[string]any) []string {
	out := make([]string, 0)
	if in != nil {
		for k, v := range in {
			out = append(out, k, u.String(v))
		}
	}
	return out
}

func parseAppPath(appURL string) (string, string) {
	arr := strings.SplitN(appURL, "/", 2)
	if len(arr) == 2 {
		return arr[0], arr[1]
	}
	return appURL, "/"
}

func (cl *Caller) Get(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
	args := gojs.MakeArgs(&argsIn, vm).Check(1)
	app, path := parseAppPath(args.Str(0))
	return makeResult(cl.client.Get(app, path, cl.makeHeaderArray(args.Map(1))...), vm)
}

func (cl *Caller) Head(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
	args := gojs.MakeArgs(&argsIn, vm).Check(1)
	app, path := parseAppPath(args.Str(0))
	return makeResult(cl.client.Head(app, path, cl.makeHeaderArray(args.Map(1))...), vm)
}

func (cl *Caller) Post(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
	args := gojs.MakeArgs(&argsIn, vm).Check(2)
	app, path := parseAppPath(args.Str(0))
	return makeResult(cl.client.Post(app, path, args.Any(1), cl.makeHeaderArray(args.Map(2))...), vm)
}

func (cl *Caller) Put(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
	args := gojs.MakeArgs(&argsIn, vm).Check(2)
	app, path := parseAppPath(args.Str(0))
	return makeResult(cl.client.Put(app, path, args.Any(1), cl.makeHeaderArray(args.Map(2))...), vm)
}

func (cl *Caller) Delete(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
	args := gojs.MakeArgs(&argsIn, vm).Check(2)
	app, path := parseAppPath(args.Str(0))
	return makeResult(cl.client.Delete(app, path, args.Any(1), cl.makeHeaderArray(args.Map(2))...), vm)
}

func (cl *Caller) Do(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
	args := gojs.MakeArgs(&argsIn, vm).Check(3)
	app, path := parseAppPath(args.Str(0))
	if len(argsIn.Arguments) == 3 {
		argsIn.Arguments = append(argsIn.Arguments, vm.ToValue(nil))
	}
	var r *httpclient.Result
	if cb, ok := goja.AssertFunction(argsIn.Arguments[3]); ok {
		r = cl.client.ManualDo(app, path, args.Str(1), args.Any(2), cl.makeHeaderArray(args.Map(4))...)
		buf := make([]byte, 1024)
		for {
			n, err := r.Response.Body.Read(buf)
			if err != nil {
				break
			}
			_, _ = cb(argsIn.This, vm.ToValue(u.String(buf[0:n])))
		}
	} else {
		r = cl.client.Do(app, path, args.Str(1), args.Any(2), cl.makeHeaderArray(args.Map(4))...)
	}
	return makeResult(r, vm)
}