package e2e

import (
	"fmt"
	"os"
	"os/exec"
	"strings"
	"testing"
)

// setLimits appends a limits block to an instance's config, which the hooks read at push time.
func setLimits(t *testing.T, in *instance, block string) {
	t.Helper()
	body, err := os.ReadFile(in.cfg.Path)
	if err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(in.cfg.Path, append(body, []byte(block)...), 0o600); err != nil {
		t.Fatal(err)
	}
}

// Chapter 27: rule 5 is an open door, and a cap on open proposals is how it is defended.
func TestOpenProposalsAreCappedPerAccountPerRepository(t *testing.T) {
	if _, err := exec.LookPath("git"); err != nil {
		t.Skip("git is not installed")
	}
	in := newInstance(t)
	john := in.account("john")
	mark := in.account("mark")
	seed(t, in, john, "john", "johnbot")
	setLimits(t, in, "\n[limits]\nmax_open_proposals = 2\n")

	mine := clone(t, in, mark, "/john/johnbot")
	for i := 0; i < 2; i++ {
		commit(t, mine, fmt.Sprintf("package main\n\nvar v = %d\n", i), fmt.Sprintf("proposal %d", i))
		run(t, mine, "git", "push", "-q", in.url(mark, "/john/johnbot"), "HEAD:refs/proposals/new")
	}

	commit(t, mine, "package main\n\nvar v = 99\n", "one too many")
	out, err := try(t, mine, "git", "push", in.url(mark, "/john/johnbot"), "HEAD:refs/proposals/new")
	if err == nil {
		t.Fatalf("a third proposal opened against a cap of two:\n%s", out)
	}
	if !strings.Contains(out, "you have 2 proposals open") {
		t.Errorf("the rejection does not say how many are open:\n%s", out)
	}
	if !strings.Contains(out, "the limit is 2") {
		t.Errorf("the rejection does not say what the limit is:\n%s", out)
	}
	if !strings.Contains(out, "land or close one") {
		t.Errorf("the rejection does not say what to do about it:\n%s", out)
	}

	// The cap is per account, so somebody else is not held back by mark's two.
	theirs := clone(t, in, john, "/john/johnbot")
	commit(t, theirs, "package main\n\nvar w = 1\n", "john proposes")
	run(t, theirs, "git", "push", "-q", in.url(john, "/john/johnbot"), "HEAD:refs/proposals/new")

	// Updating a proposal already open is not opening a new one.
	commit(t, mine, "package main\n\nvar v = 100\n", "revise the second")
	run(t, mine, "git", "push", "-q", "-f", in.url(mark, "/john/johnbot"), "HEAD:refs/proposals/2")
}