package xdelta

import (
	"fmt"
	"sync"
)

type TestGroup struct {
	*Runner
	sync.Mutex
	sync.WaitGroup
	running []*Goroutine
	errors []error
	nonerrors []error  // For tolerated / expected conditions
}

type Goroutine struct {
	*TestGroup
	name string
	done bool
}

func NewTestGroup(r *Runner) (*TestGroup, *Goroutine) {
	tg := &TestGroup{Runner: r}
	tg.WaitGroup.Add(1)
	g0 := &Goroutine{tg, "main", false}
	tg.running = append(tg.running, g0)
	return tg, g0
}

func (g *Goroutine) String() string {
	return fmt.Sprint("[", g.name, "]")
}

func (g *Goroutine) finish(err error) {
	wait := false
	tg := g.TestGroup
	tg.Lock()
	if g.done {
		if err != nil {
			tg.nonerrors = append(tg.nonerrors, err)
		}
	} else {
		wait = true
		g.done = true
		if err != nil {
			tg.errors = append(tg.errors, err)
		}
	}
	tg.Unlock()
	if wait {
		tg.WaitGroup.Done()
	}
}

func (g *Goroutine) OK() {
	g.finish(nil)
}

func (g *Goroutine) Panic(err error) {
	g.finish(err)
	select {}
}

func (t *TestGroup) Go(name string, f func(*Goroutine)) *Goroutine {
	g := &Goroutine{t, name, false}
	t.Lock()
	t.WaitGroup.Add(1)
	t.running = append(t.running, g)
	t.Unlock()
	go f(g)
	return g
}

func (t *TestGroup) Wait(self *Goroutine, procs... *Run) {
	self.OK()
	t.WaitGroup.Wait()
	for _, p := range procs {
		if err := p.Wait(); err != nil {
			t.errors = append(t.errors, err)
		}
	}
	for _, err := range t.errors {
		fmt.Println(":ERROR:", err)
	}
	for _, err := range t.nonerrors {
		fmt.Println("(ERROR)", err)
	}
	if len(t.errors) != 0 {
		panic(fmt.Sprintf("Test failed with", len(t.errors), "errors"))
	}
}