package hook_test

import (
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"

	"git.zb-server.de/Sebi/ssh-netbox-wrapper/internal/hook"
)

// --- ProfilePath ---

func TestProfilePath_Bash(t *testing.T) {
	orig := os.Getenv("HOME")
	os.Setenv("HOME", t.TempDir())
	defer os.Setenv("HOME", orig)

	p, err := hook.ProfilePath("bash")
	if err != nil {
		t.Fatalf("ProfilePath(bash): %v", err)
	}
	if !strings.HasSuffix(p, ".bashrc") {
		t.Errorf("bash profile should end with .bashrc, got %q", p)
	}
}

func TestProfilePath_Zsh(t *testing.T) {
	orig := os.Getenv("HOME")
	os.Setenv("HOME", t.TempDir())
	defer os.Setenv("HOME", orig)

	p, err := hook.ProfilePath("zsh")
	if err != nil {
		t.Fatalf("ProfilePath(zsh): %v", err)
	}
	if !strings.HasSuffix(p, ".zshrc") {
		t.Errorf("zsh profile should end with .zshrc, got %q", p)
	}
}

func TestProfilePath_Fish(t *testing.T) {
	dir := t.TempDir()
	orig := os.Getenv("XDG_CONFIG_HOME")
	os.Setenv("XDG_CONFIG_HOME", dir)
	defer os.Setenv("XDG_CONFIG_HOME", orig)

	p, err := hook.ProfilePath("fish")
	if err != nil {
		t.Fatalf("ProfilePath(fish): %v", err)
	}
	if !strings.HasSuffix(p, "config.fish") {
		t.Errorf("fish profile should end with config.fish, got %q", p)
	}
}

func TestProfilePath_UnknownShell(t *testing.T) {
	if _, err := hook.ProfilePath("ksh"); err == nil {
		t.Error("unknown shell should return an error")
	}
}

// --- IsInstalled ---

func TestIsInstalled_Present(t *testing.T) {
	profile := writeProfile(t, hook.Line+"\n")
	if !hook.IsInstalled(profile) {
		t.Error("IsInstalled should return true when marker is present")
	}
}

func TestIsInstalled_Absent(t *testing.T) {
	profile := writeProfile(t, "export PATH=$PATH\n")
	if hook.IsInstalled(profile) {
		t.Error("IsInstalled should return false when marker is absent")
	}
}

func TestIsInstalled_MissingFile(t *testing.T) {
	if hook.IsInstalled("/nonexistent/path/.bashrc") {
		t.Error("IsInstalled should return false for missing file")
	}
}

// --- Install ---

func TestInstall_Fresh(t *testing.T) {
	profile := filepath.Join(t.TempDir(), ".bashrc")

	installed, err := hook.Install(profile, "bash")
	if err != nil {
		t.Fatalf("Install: %v", err)
	}
	if !installed {
		t.Error("should report installed=true on fresh install")
	}
	if !hook.IsInstalled(profile) {
		t.Error("profile should contain the hook line after Install")
	}
}

func TestInstall_Idempotent(t *testing.T) {
	profile := filepath.Join(t.TempDir(), ".bashrc")

	hook.Install(profile, "bash")
	installed, err := hook.Install(profile, "bash")
	if err != nil {
		t.Fatalf("second Install: %v", err)
	}
	if installed {
		t.Error("second Install should report installed=false")
	}

	data, _ := os.ReadFile(profile)
	if count := strings.Count(string(data), hook.Marker); count != 1 {
		t.Errorf("hook line should appear exactly once, got %d", count)
	}
}

func TestInstall_CreatesProfileAndParentDirs(t *testing.T) {
	profile := filepath.Join(t.TempDir(), "nested", "dir", ".zshrc")

	if _, err := hook.Install(profile, "bash"); err != nil {
		t.Fatalf("Install should create missing directories: %v", err)
	}
	if _, err := os.Stat(profile); err != nil {
		t.Error("profile file should have been created")
	}
}

func TestInstall_PreservesExistingContent(t *testing.T) {
	profile := writeProfile(t, "export PATH=$PATH:/usr/local/bin\n")

	hook.Install(profile, "bash")

	data, _ := os.ReadFile(profile)
	content := string(data)
	if !strings.Contains(content, "export PATH") {
		t.Error("Install should not remove existing content")
	}
	if !strings.Contains(content, hook.Marker) {
		t.Error("hook line should be appended")
	}
}

func TestInstall_AppendedAtEnd(t *testing.T) {
	profile := writeProfile(t, "existing line\n")
	hook.Install(profile, "bash")

	data, _ := os.ReadFile(profile)
	lines := strings.Split(strings.TrimRight(string(data), "\n"), "\n")
	last := lines[len(lines)-1]
	if last != hook.BlockEnd {
		t.Errorf("managed block should end the profile, got %q", last)
	}
}

// --- Uninstall ---

func TestUninstall_Removes(t *testing.T) {
	profile := writeProfile(t, "export PATH=$PATH\n"+hook.Line+"\nexport FOO=bar\n")

	removed, err := hook.Uninstall(profile)
	if err != nil {
		t.Fatalf("Uninstall: %v", err)
	}
	if !removed {
		t.Error("should report removed=true")
	}
	if hook.IsInstalled(profile) {
		t.Error("hook line should have been removed")
	}
}

func TestUninstall_PreservesOtherContent(t *testing.T) {
	profile := writeProfile(t, "export FOO=bar\n"+hook.Line+"\nexport BAZ=qux\n")

	hook.Uninstall(profile)

	data, _ := os.ReadFile(profile)
	content := string(data)
	if !strings.Contains(content, "export FOO=bar") {
		t.Error("content before hook should be preserved")
	}
	if !strings.Contains(content, "export BAZ=qux") {
		t.Error("content after hook should be preserved")
	}
}

func TestUninstall_NotPresent(t *testing.T) {
	profile := writeProfile(t, "export PATH=$PATH\n")

	removed, err := hook.Uninstall(profile)
	if err != nil {
		t.Fatalf("Uninstall: %v", err)
	}
	if removed {
		t.Error("should report removed=false when hook was not present")
	}
}

func TestUninstall_MissingFile(t *testing.T) {
	removed, err := hook.Uninstall("/nonexistent/.bashrc")
	if err != nil {
		t.Errorf("Uninstall on missing file should not error: %v", err)
	}
	if removed {
		t.Error("should report removed=false for missing file")
	}
}

func TestUninstall_CollapsesExtraBlankLines(t *testing.T) {
	// blank line before hook + hook + blank line after = three consecutive newlines after removal
	profile := writeProfile(t, "line1\n\n"+hook.Line+"\n\nline2\n")

	hook.Uninstall(profile)

	data, _ := os.ReadFile(profile)
	if strings.Contains(string(data), "\n\n\n") {
		t.Error("three consecutive blank lines should be collapsed after uninstall")
	}
}

// --- Roundtrip ---

func TestInstallUninstall_Roundtrip(t *testing.T) {
	profile := writeProfile(t, "existing content\n")

	hook.Install(profile, "bash")
	if !hook.IsInstalled(profile) {
		t.Fatal("should be installed after Install")
	}

	hook.Uninstall(profile)
	if hook.IsInstalled(profile) {
		t.Fatal("should not be installed after Uninstall")
	}

	data, _ := os.ReadFile(profile)
	if !strings.Contains(string(data), "existing content") {
		t.Error("original content should survive install+uninstall cycle")
	}
}

// --- ReloadNote ---

func TestReloadNote_ContainsPath(t *testing.T) {
	note := hook.ReloadNote("/home/user/.bashrc")
	if !strings.Contains(note, "/home/user/.bashrc") {
		t.Errorf("ReloadNote should contain the profile path, got %q", note)
	}
}

// --- helpers ---

func writeProfile(t *testing.T, content string) string {
	t.Helper()
	f := filepath.Join(t.TempDir(), "profile")
	if err := os.WriteFile(f, []byte(content), 0o644); err != nil {
		t.Fatal(err)
	}
	return f
}

func TestManagedBlockInstallAndUninstall(t *testing.T) {
	original := "export KEEP=yes\n# netssh shell-init documentation\necho 'netssh shell-init'\n"
	profile := writeProfile(t, original+hook.BlockStart+"\nexport PATH='/custom/bin':\"$PATH\"\n'/custom/bin/netssh' shell-init\n[ ! -f '/custom/cache/netssh/aliases.sh' ] || . '/custom/cache/netssh/aliases.sh'\n"+hook.BlockEnd+"\n")
	if installed, err := hook.Install(profile, "bash"); err != nil || installed {
		t.Fatalf("duplicate install: %v, %v", installed, err)
	}
	if installed, err := hook.InstallAliasesSource(profile); err != nil || installed {
		t.Fatalf("duplicate source: %v, %v", installed, err)
	}
	if removed, err := hook.Uninstall(profile); err != nil || !removed {
		t.Fatalf("uninstall: %v, %v", removed, err)
	}
	data, _ := os.ReadFile(profile)
	if string(data) != original {
		t.Fatalf("unrelated content changed: %s", data)
	}
}

func TestProfilePathRespectsZdotdir(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("ZDOTDIR", dir)
	path, err := hook.ProfilePath("zsh")
	if err != nil || path != filepath.Join(dir, ".zshrc") {
		t.Fatalf("zsh path: %s, %v", path, err)
	}
}

func TestInstallReplacesLegacyEntriesWithBlock(t *testing.T) {
	t.Setenv("XDG_CACHE_HOME", t.TempDir())
	profile := writeProfile(t, "export KEEP=yes\nnetssh shell-init\nsource ~/.cache/netssh/aliases.sh 2>/dev/null\neval \"$(netssh alias)\"\nalias j='netssh'\necho 'netssh shell-init'\n")
	installed, err := hook.Install(profile, "zsh")
	if err != nil || !installed {
		t.Fatalf("install: %v, %v", installed, err)
	}
	data, _ := os.ReadFile(profile)
	content := string(data)
	for _, gone := range []string{"\nnetssh shell-init\nsource", "eval ", "alias j="} {
		if strings.Contains(content, gone) {
			t.Fatalf("legacy entry %q kept:\n%s", gone, content)
		}
	}
	for _, kept := range []string{"export KEEP=yes", "echo 'netssh shell-init'", hook.BlockStart, "compdef _netssh netssh", "fpath=("} {
		if !strings.Contains(content, kept) {
			t.Fatalf("missing %q:\n%s", kept, content)
		}
	}
	if strings.Count(content, hook.BlockStart) != 1 {
		t.Fatalf("duplicate blocks:\n%s", content)
	}
	if removed, err := hook.Uninstall(profile); err != nil || !removed {
		t.Fatalf("uninstall: %v, %v", removed, err)
	}
	data, _ = os.ReadFile(profile)
	if string(data) != "export KEEP=yes\necho 'netssh shell-init'\n" {
		t.Fatalf("unexpected remainder: %q", data)
	}
}

func TestBlockPerShell(t *testing.T) {
	if b := hook.Block("fish"); strings.Contains(b, "aliases.sh") || strings.Contains(b, "compdef") {
		t.Fatalf("fish block: %s", b)
	}
	if b := hook.Block("bash"); !strings.Contains(b, "aliases.sh") || strings.Contains(b, "compdef") {
		t.Fatalf("bash block: %s", b)
	}
}

func TestZshBlockRegistersCompletionAfterCompinit(t *testing.T) {
	zsh, err := exec.LookPath("zsh")
	if err != nil {
		t.Skip("zsh unavailable")
	}
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("ZDOTDIR", home)
	t.Setenv("XDG_CACHE_HOME", filepath.Join(home, "cache"))
	if err := os.MkdirAll(hook.ZshFuncDir(), 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(hook.ZshFuncDir(), "_netssh"), []byte(hook.ZshCompletionScript), 0o644); err != nil {
		t.Fatal(err)
	}
	// compinit runs before the block, as with oh-my-zsh.
	rc := "autoload -Uz compinit && compinit -u -d \"$HOME/.zcompdump\"\nnetssh() { :; }\n" + hook.Block("zsh")
	if err := os.WriteFile(filepath.Join(home, ".zshrc"), []byte(rc), 0o644); err != nil {
		t.Fatal(err)
	}
	out, err := exec.Command(zsh, "-i", "-c", `print -r -- $_comps[netssh]`).CombinedOutput()
	if err != nil || !strings.Contains(string(out), "_netssh") {
		t.Fatalf("completion not registered: %v\n%s", err, out)
	}
}