package main

import (
	"os/exec"
	"path/filepath"
	"strings"
	"sync"
)

func Compile(cfg *CompileConfig, ch chan<- *CompileReport, wg *sync.WaitGroup) {
	b := new(strings.Builder)
	data := &OutputFileTmplData{
		Name: ProjectName,
		OS:   cfg.OS,
		Arch: cfg.Arch,
		Ext:  cfg.FileExt,
	}
	if err := OutputFileTmpl.Execute(b, data); err != nil {
		ch <- &CompileReport{Config: cfg, State: StateCompileError}
		wg.Done()
		return
	}

	filePath := filepath.Join(*OutputDir, b.String())

	filePath, err := filepath.Abs(filePath)
	if err != nil {
		ch <- &CompileReport{Config: cfg, State: StateCompileError}
		wg.Done()
		return
	}

	ch <- &CompileReport{Config: cfg, State: StateCompiling}

	compileCmd := exec.Command("go", "build", "-o", filePath)
	compileCmd.Dir = ModulePath

	if err := compileCmd.Start(); err != nil {
		ch <- &CompileReport{Config: cfg, State: StateCompileError}
		wg.Done()
		return
	}
	if err := compileCmd.Wait(); err != nil {
		ch <- &CompileReport{Config: cfg, State: StateCompileError}
		wg.Done()
		return
	}
	Compress(filePath, cfg, ch, wg)

	// uncomment for independent compile and compress tasks
	// (slightly slower in tests, most likely because of more context switches)
	/*
		ch <- &CompileReport{Config: cfg, State: StateWaiting}
		go Runner.Run(func() { Compress(filePath, cfg, ch, wg) })
	*/
}

func Compress(filePath string, cfg *CompileConfig, ch chan<- *CompileReport, wg *sync.WaitGroup) {
	defer wg.Done()

	ch <- &CompileReport{Config: cfg, State: StateCompressing}

	if !*NoCompress && cfg.Compress {
		compressCmd := exec.Command("upx", "--best", filePath)
		compressCmd.Dir = ModulePath

		if err := compressCmd.Start(); err != nil {
			ch <- &CompileReport{Config: cfg, State: StateCompressError}
			return
		}

		if err := compressCmd.Wait(); err != nil {
			ch <- &CompileReport{Config: cfg, State: StateCompressError}
			return
		}
	}

	ch <- &CompileReport{Config: cfg, State: StateDone}
}