package main

// overview_test.go — the inventory view: what mgsh knows that plain git cannot.

import (
	"errors"
	"io"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"
)

// TestReadStatusParsesPorcelainV2 covers the single `git status` call that
// replaced three separate ones: branch, upstream, ahead/behind and dirty all
// come out of its header.
func TestReadStatusParsesPorcelainV2(t *testing.T) {
	dir := t.TempDir()
	bare := filepath.Join(t.TempDir(), "o.git")
	mustGit(t, "", "init", "--bare", "-q", bare)
	mustGit(t, dir, "init", "-q")
	mustGit(t, dir, "config", "user.name", "t")
	mustGit(t, dir, "config", "user.email", "t@e")
	mustGit(t, dir, "commit", "-q", "--allow-empty", "-m", "[mike@laptop] work")
	mustGit(t, dir, "remote", "add", "origin", bare)
	mustGit(t, dir, "push", "-q", "-u", "origin", "HEAD")

	var s projStatus
	readStatus(&s, dir)
	if !s.hasUpstream || s.ahead != 0 || s.behind != 0 || s.dirty {
		t.Errorf("clean synced repo = %+v", s)
	}
	if s.branch == "" || s.branch == "-" {
		t.Errorf("branch not read: %q", s.branch)
	}

	// one unstaged file and one unpushed commit
	if err := os.WriteFile(filepath.Join(dir, "x"), []byte("x"), 0644); err != nil {
		t.Fatal(err)
	}
	mustGit(t, dir, "commit", "-q", "--allow-empty", "-m", "[mike@desktop] more")

	s = projStatus{}
	readStatus(&s, dir)
	if !s.dirty {
		t.Error("untracked file did not register as dirty")
	}
	if s.ahead != 1 {
		t.Errorf("ahead = %d, want 1", s.ahead)
	}

	// and the host stamp `push` writes is picked up
	var l projStatus
	readLastCommit(&l, dir)
	if l.lastHost != "desktop" {
		t.Errorf("lastHost = %q, want desktop", l.lastHost)
	}
	if l.lastWhen.IsZero() {
		t.Error("lastWhen not read")
	}
}

// TestCommitHostRe: only mgsh's own "[user@host]" stamp counts.
func TestCommitHostRe(t *testing.T) {
	cases := map[string]string{
		"[mike@laptop] fixed a thing": "laptop",
		"[mike@build-01] ":            "build-01",
		"[@host] no user":             "host",
		"fixed a thing":               "",
		"[not a stamp] text":          "",
		"see [a@b] mid-line":          "",
	}
	for subj, want := range cases {
		got := ""
		if m := commitHostRe.FindStringSubmatch(subj); m != nil {
			got = m[1]
		}
		if got != want {
			t.Errorf("host of %q = %q, want %q", subj, got, want)
		}
	}
}

// TestReportInventoryUnreachableServer: when the server cannot be listed, the
// overview must say so rather than claim every project is missing there.
func TestReportInventoryUnreachableServer(t *testing.T) {
	out := captureStdout(t, func() {
		reportInventory([]string{"a", "b"}, nil, errors.New("network is unreachable"))
	})
	if strings.Contains(out, "not on the server") {
		t.Errorf("an unreachable server was reported as missing repositories: %q", out)
	}
	if !strings.Contains(out, "not reachable") {
		t.Errorf("no hint that the server was unreachable: %q", out)
	}
}

// TestReportInventorySplitsSides is the join that plain git cannot do.
func TestReportInventorySplitsSides(t *testing.T) {
	out := captureStdout(t, func() {
		reportInventory([]string{"both", "onlyhere"}, []string{"both", "onlythere"}, nil)
	})
	if !strings.Contains(out, "not on the server (init)") || !strings.Contains(out, "onlyhere") {
		t.Errorf("local-only project not reported: %q", out)
	}
	if !strings.Contains(out, "not cloned here (clone)") || !strings.Contains(out, "onlythere") {
		t.Errorf("server-only project not reported: %q", out)
	}
	if strings.Contains(out, "both") {
		t.Errorf("a project present on both sides should not be listed: %q", out)
	}
}

func TestShortAge(t *testing.T) {
	cases := []struct {
		d    time.Duration
		want string
	}{
		{30 * time.Second, "now"},
		{90 * time.Second, "1m"},
		{2 * time.Hour, "2h"},
		{36 * time.Hour, "1d"},
		{20 * 24 * time.Hour, "20d"},
	}
	for _, c := range cases {
		if got := shortAge(c.d); got != c.want {
			t.Errorf("shortAge(%v) = %q, want %q", c.d, got, c.want)
		}
	}
}

// captureStdout collects everything a function prints.
func captureStdout(t *testing.T, fn func()) string {
	t.Helper()
	old := os.Stdout
	r, w, err := os.Pipe()
	if err != nil {
		t.Fatal(err)
	}
	os.Stdout = w
	done := make(chan string)
	go func() {
		var b strings.Builder
		io.Copy(&b, r)
		done <- b.String()
	}()
	fn()
	w.Close()
	os.Stdout = old
	return <-done
}