package main

import (
	"bytes"
	"io"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"sync"
	"testing"
	"time"
)

func git(t *testing.T, dir string, args ...string) {
	t.Helper()
	cmd := exec.Command("git", append([]string{"-C", dir}, args...)...)
	if out, err := cmd.CombinedOutput(); err != nil {
		t.Fatalf("git %v: %v\n%s", args, err, out)
	}
}

func makeRepo(t *testing.T, path string) {
	t.Helper()
	if err := os.MkdirAll(path, 0o755); err != nil {
		t.Fatal(err)
	}
	git(t, path, "init", "-q")
	git(t, path, "config", "user.name", "Test")
	git(t, path, "config", "user.email", "test@example.com")
	if err := os.WriteFile(filepath.Join(path, "tracked.txt"), []byte("clean\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	git(t, path, "add", "tracked.txt")
	git(t, path, "commit", "-qm", "initial")
	git(t, path, "remote", "add", "origin", "https://example.invalid/repo.git")
}

func TestDiscoverNestedRepositories(t *testing.T) {
	root := t.TempDir()
	parent := filepath.Join(root, "parent")
	child := filepath.Join(parent, "apps", "child")
	makeRepo(t, parent)
	makeRepo(t, child)

	paths, err := discover(root, nil)
	if err != nil {
		t.Fatal(err)
	}
	if len(paths) != 2 || paths[0] != parent || paths[1] != child {
		t.Fatalf("discover() = %#v", paths)
	}
}

func TestNestedRepoDoesNotDirtyParent(t *testing.T) {
	root := t.TempDir()
	parent := filepath.Join(root, "parent")
	child := filepath.Join(parent, "child")
	makeRepo(t, parent)
	makeRepo(t, child)

	paths, _ := discover(root, nil)
	got := inspect(root, parent, paths)
	if !got.Eligible {
		t.Fatalf("parent blocked by nested repo: %+v", got)
	}
	if len(got.NestedRepoEntries) == 0 {
		t.Fatalf("expected nested repository entry to be recorded: %+v", got)
	}
}

func TestDirtyFileIsReportedButRepositoryRemainsEligible(t *testing.T) {
	root := t.TempDir()
	path := filepath.Join(root, "repo")
	makeRepo(t, path)
	if err := os.WriteFile(filepath.Join(path, "tracked.txt"), []byte("changed\n"), 0o644); err != nil {
		t.Fatal(err)
	}

	got := inspect(root, path, []string{path})
	if !got.Eligible || len(got.Dirty) != 1 {
		t.Fatalf("dirty repository was not eligible with its changes reported: %+v", got)
	}
}

func TestUntrackedFileAlongsideNestedRepoIsStillReported(t *testing.T) {
	root := t.TempDir()
	parent := filepath.Join(root, "parent")
	child := filepath.Join(parent, "child")
	makeRepo(t, parent)
	makeRepo(t, child)
	if err := os.WriteFile(filepath.Join(parent, "notes.txt"), []byte("work\n"), 0o644); err != nil {
		t.Fatal(err)
	}

	paths, _ := discover(root, nil)
	got := inspect(root, parent, paths)
	if !got.Eligible || len(got.Dirty) != 1 {
		t.Fatalf("untracked file should be reported without blocking parent: %+v", got)
	}
}

func TestSkippedDirectoriesAreNotSearched(t *testing.T) {
	root := t.TempDir()
	makeRepo(t, filepath.Join(root, "node_modules", "dependency"))
	makeRepo(t, filepath.Join(root, "real"))
	paths, err := discover(root, nil)
	if err != nil {
		t.Fatal(err)
	}
	if len(paths) != 1 || paths[0] != filepath.Join(root, "real") {
		t.Fatalf("discover() = %#v", paths)
	}
}

func TestStrictSyncRechecksAndSkipsNewlyDirtyRepository(t *testing.T) {
	root := t.TempDir()
	path := filepath.Join(root, "repo")
	makeRepo(t, path)
	planned := inspect(root, path, []string{path})
	if !planned.Eligible {
		t.Fatalf("fixture should initially be eligible: %+v", planned)
	}
	if err := os.WriteFile(filepath.Join(path, "late-change.txt"), []byte("do not touch\n"), 0o644); err != nil {
		t.Fatal(err)
	}

	var progress []syncProgressEvent
	results := syncSelectedWithProgress(root, []repo{planned}, []repo{planned}, 1, time.Minute, io.Discard, true, true, false, nil, func(event syncProgressEvent) {
		progress = append(progress, event)
	})
	if len(results) != 1 || !results[0].Skipped || results[0].Success {
		t.Fatalf("syncAll() = %+v", results)
	}
	if len(progress) != 1 || progress[0].Started || !progress[0].Result.Skipped {
		t.Fatalf("progress events = %+v, want one finished skip", progress)
	}
}

func TestScanReportsDirtyEligibleRepository(t *testing.T) {
	root := t.TempDir()
	path := filepath.Join(root, "repo")
	makeRepo(t, path)
	if err := os.WriteFile(filepath.Join(path, "untracked.txt"), []byte("work\n"), 0o644); err != nil {
		t.Fatal(err)
	}

	var stdout, stderr bytes.Buffer
	code := run([]string{"scan", "--root", root}, bytes.NewReader(nil), &stdout, &stderr)
	if code != 0 {
		t.Fatalf("run() code = %d, stderr = %q", code, stderr.String())
	}
	if !bytes.Contains(stdout.Bytes(), []byte("dirty worktree (1 changes), checked-out branch protected")) {
		t.Fatalf("scan did not report dirty eligible repository:\n%s", stdout.String())
	}
}

func TestIndentNormalizesGitProgressOutput(t *testing.T) {
	got := indent("first\rsecond\r\nthird", "    ")
	want := "    first\n    second\n    third"
	if got != want {
		t.Fatalf("indent() = %q, want %q", got, want)
	}
}

// The summary must say what actually changed, not just how many repositories
// ran. "synced" previously counted repositories where nothing was touched.
func TestSummaryReportsPerActionCountsAndDeletions(t *testing.T) {
	results := []syncResult{
		{Path: "api", Success: true, Branches: []branchSyncResult{
			{Branch: "main", Action: "updated"},
			{Branch: "stale", Action: "deleted", Message: "upstream was deleted and the branch was merged into main"},
		}},
		{Path: "web", Success: true, Branches: []branchSyncResult{
			{Branch: "wip", Action: "protected"},
		}},
		{Path: "cli", Success: true},
		{Path: "docs", Message: "fetch origin: authentication failed"},
	}

	var out bytes.Buffer
	printSummary(&out, results)
	got := out.String()

	for _, want := range []string{
		"1 changed", "2 unchanged", "1 failed", "0 skipped",
		"1 updated · 1 deleted · 1 protected",
		"Needs review:",
		"DELETED  api / stale: upstream was deleted and the branch was merged into main",
		"FAILED   docs: fetch origin: authentication failed",
	} {
		if !strings.Contains(got, want) {
			t.Fatalf("summary missing %q:\n%s", want, got)
		}
	}
	// A workspace where nothing changed must not claim to have synced anything,
	// and must not open a "Needs review" section with nothing to review.
	var quiet bytes.Buffer
	printSummary(&quiet, []syncResult{{Path: "web", Success: true, Branches: []branchSyncResult{{Branch: "wip", Action: "protected"}}}})
	if strings.Contains(quiet.String(), "1 changed") {
		t.Fatalf("a protected-only run was reported as changed:\n%s", quiet.String())
	}
	if strings.Contains(quiet.String(), "Needs review") {
		t.Fatalf("a run with no failures or deletions opened a review section:\n%s", quiet.String())
	}
}

// The in-place progress line must never be written to a pipe, a buffer, or a
// --json document, where the cursor control would corrupt the captured output.
func TestLiveProgressIsDisabledForNonTerminalOutput(t *testing.T) {
	var mu sync.Mutex
	if p := newLiveProgress(&bytes.Buffer{}, &mu, 3); p != nil {
		t.Fatal("newLiveProgress() enabled the live line for a buffered writer")
	}
}

func TestLiveProgressRendersRunningTotals(t *testing.T) {
	var mu sync.Mutex
	buf := &bytes.Buffer{}
	p := &liveProgress{w: buf, mu: &mu, total: 3, counts: map[string]int{}}

	p.update(func() { p.started(); p.draw() })
	if !strings.Contains(buf.String(), "0/3") || !strings.Contains(buf.String(), "1 active") {
		t.Fatalf("start did not render progress: %q", buf.String())
	}

	buf.Reset()
	p.update(func() {
		p.finished(syncResult{Path: "api", Success: true, Branches: []branchSyncResult{{Branch: "main", Action: "updated"}}})
		p.draw()
	})
	for _, want := range []string{"1/3", "1 changed", "1 updated"} {
		if !strings.Contains(buf.String(), want) {
			t.Fatalf("totals missing %q: %q", want, buf.String())
		}
	}

	buf.Reset()
	p.update(func() {
		p.finished(syncResult{Path: "web", Message: "fetch origin: authentication failed"})
		p.draw()
	})
	for _, want := range []string{"2/3", "1 FAILED"} {
		if !strings.Contains(buf.String(), want) {
			t.Fatalf("failure not surfaced live: %q", buf.String())
		}
	}
	if strings.Contains(buf.String(), "2 changed") {
		t.Fatalf("a failed repository was counted as changed: %q", buf.String())
	}
}

// End-to-end guard: a non-interactive run must emit no carriage returns at all.
func TestSyncOutputToBufferHasNoCarriageReturns(t *testing.T) {
	root := t.TempDir()
	path := filepath.Join(root, "repo")
	makeRepo(t, path)

	var stdout, stderr bytes.Buffer
	code := run([]string{"sync", "--root", root, "--yes"}, bytes.NewReader(nil), &stdout, &stderr)
	if code > 1 {
		t.Fatalf("run() code = %d, stderr = %q", code, stderr.String())
	}
	if strings.Contains(stdout.String(), "\r") {
		t.Fatalf("buffered output contained cursor control:\n%q", stdout.String())
	}
	if !strings.Contains(stdout.String(), "Summary:") {
		t.Fatalf("run did not print a summary:\n%q", stdout.String())
	}
}