package darwin

import (
	"bytes"
	"io/ioutil"
	"path/filepath"
	"strings"
	"text/template"
)

const makefileTemplate = `# Автогенерируемый Makefile
FILES    := {{.FILES}}
RUNTIME  := {{.RUNTIME}}
TARGET   := {{.TARGET}}

CC       := clang
CFLAGS   := -I$(RUNTIME) -o3
LDFLAGS  := -lm -rdynamic

SRCS     := $(FILES) \
            $(RUNTIME)/rt_api.c \
            $(RUNTIME)/rt_sysapi.c \
            $(RUNTIME)/rt_syscrash_linux.c

OUT      := ../$(TARGET).exe

.PHONY: darwin-build clean

darwin-build:
	$(CC) $(SRCS) $(CFLAGS)  $(LDFLAGS) -o $(OUT)

clean:
	rm -f $(OUT)

`

type Vars struct {
	FILES   string
	RUNTIME string
	TARGET  string
}

func getCFilesInCurrentDir() (string, error) {
	files, err := ioutil.ReadDir("./_си")
	if err != nil {
		return "", err
	}

	var cFiles []string
	for _, f := range files {
		if !f.IsDir() && filepath.Ext(f.Name()) == ".c" {
			cFiles = append(cFiles, f.Name())
		}
	}

	return strings.Join(cFiles, " "), nil
}

func renderMakefile(vars Vars) (string, error) {
	tmpl, err := template.New("makefile").Parse(makefileTemplate)
	if err != nil {
		return "", err
	}
	var buf bytes.Buffer
	if err := tmpl.Execute(&buf, vars); err != nil {
		return "", err
	}
	return buf.String(), nil
}