package hook_test

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

	"git.zb-server.de/Sebi/ssh-netbox-wrapper/internal/hook"
	"github.com/spf13/cobra"
)

func completionEnvironment(t *testing.T) map[string]string {
	t.Helper()
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("XDG_CONFIG_HOME", filepath.Join(home, "config"))
	t.Setenv("XDG_CACHE_HOME", filepath.Join(home, "cache"))
	if err := os.MkdirAll(hook.FishConfigDir(), 0o755); err != nil {
		t.Fatal(err)
	}
	return map[string]string{
		"bash": filepath.Join(home, ".local", "share", "bash-completion", "completions", "j"),
		"zsh":  filepath.Join(home, ".zfunc", "_j"),
		"fish": filepath.Join(hook.FishConfigDir(), "completions", "j.fish"),
	}
}

func TestCommandCompletionTracksAliasChanges(t *testing.T) {
	paths := completionEnvironment(t)
	if err := hook.WriteAliasFiles([]hook.AliasEntry{{Name: "j"}}); err != nil {
		t.Fatal(err)
	}
	for _, path := range paths {
		if _, err := os.Stat(path); err != nil {
			t.Fatal(err)
		}
	}
	// A manually replaced completion file must survive removal of the old alias.
	custom := "# user-owned completion\n"
	if err := os.WriteFile(paths["bash"], []byte(custom), 0o644); err != nil {
		t.Fatal(err)
	}
	if err := hook.WriteAliasFiles([]hook.AliasEntry{{Name: "k"}}); err != nil {
		t.Fatal(err)
	}
	for shell, path := range paths {
		if shell == "bash" {
			data, err := os.ReadFile(path)
			if err != nil || string(data) != custom {
				t.Fatal("user completion was removed")
			}
		} else if _, err := os.Stat(path); !os.IsNotExist(err) {
			t.Fatalf("stale %s completion remains: %v", shell, err)
		}
	}
	if err := hook.WriteAliasFiles(nil); err != nil {
		t.Fatal(err)
	}
	for _, path := range []string{
		filepath.Join(os.Getenv("HOME"), ".local", "share", "bash-completion", "completions", "k"),
		filepath.Join(os.Getenv("HOME"), ".zfunc", "_k"),
		filepath.Join(hook.FishConfigDir(), "completions", "k.fish"),
	} {
		if _, err := os.Stat(path); !os.IsNotExist(err) {
			t.Fatalf("disabled completion remains: %s: %v", path, err)
		}
	}
}

func TestCommandAliasCompletesServerNamesAcrossShells(t *testing.T) {
	for _, shell := range []string{"bash", "zsh", "fish"} {
		t.Run(shell, func(t *testing.T) {
			executable, err := exec.LookPath(shell)
			if err != nil {
				t.Skipf("%s unavailable", shell)
			}
			paths := completionEnvironment(t)
			if err := hook.SyncCommandCompletion("j"); err != nil {
				t.Fatal(err)
			}
			fixtures := t.TempDir()
			root := &cobra.Command{Use: "netssh"}
			var canonical bytes.Buffer
			switch shell {
			case "bash":
				err = root.GenBashCompletionV2(&canonical, true)
			case "zsh":
				_, err = canonical.WriteString(hook.ZshCompletionScript)
			case "fish":
				err = root.GenFishCompletion(&canonical, true)
			}
			if err != nil {
				t.Fatal(err)
			}
			if err := os.WriteFile(filepath.Join(fixtures, shell), canonical.Bytes(), 0o644); err != nil {
				t.Fatal(err)
			}
			// Exercise Cobra's actual generated shell code with a deterministic backend.
			backend := `#!/bin/bash
case "$1" in
 completion) cat "$COMPLETION_FIXTURES/$2" ;;
 __complete|__completeNoDesc) printf 'server01\n:4\n' ;;
 *) exit 1 ;;
esac
`
			if err := os.WriteFile(filepath.Join(fixtures, "netssh"), []byte(backend), 0o755); err != nil {
				t.Fatal(err)
			}
			t.Setenv("COMPLETION_FIXTURES", fixtures)
			t.Setenv("ALIAS_COMPLETION", paths[shell])
			t.Setenv("PATH", fixtures+string(os.PathListSeparator)+os.Getenv("PATH"))
			var script string
			var args []string
			switch shell {
			case "bash":
				library := ""
				for _, path := range []string{"/usr/share/bash-completion/bash_completion", "/etc/bash_completion"} {
					if _, err := os.Stat(path); err == nil {
						library = path
						break
					}
				}
				if library == "" {
					t.Skip("bash-completion unavailable")
				}
				t.Setenv("BASH_COMPLETION_LIBRARY", library)
				args = []string{"--noprofile", "--norc", "-c"}
				script = `source "$BASH_COMPLETION_LIBRARY"
shopt -s expand_aliases
alias j=netssh
_completion_loader j
COMP_WORDS=(j ser)
COMP_CWORD=1
COMP_LINE='j ser'
COMP_POINT=5
COMP_TYPE=9
COMP_KEY=9
__start_netssh j ser j
printf '%s\n' "${COMPREPLY[@]}"
`
			case "zsh":
				args = []string{"-f", "-c"}
				script = `fpath=("$HOME/.zfunc" $fpath)
autoload -Uz compinit
compinit -u -D
alias j=netssh
autoload -Uz _j
# Capture matches without requiring an interactive ZLE completion widget.
_describe() { print -rl -- "${(P)4}"; }
compadd() { print -rl -- "$@"; }
words=(j ser)
CURRENT=2
_j
`
			case "fish":
				args = []string{"--no-config", "-c"}
				script = `alias j netssh
set -p fish_complete_path "$XDG_CONFIG_HOME/fish/completions"
complete --do-complete 'j ser'
`
			}
			cmd := exec.Command(executable, append(args, script)...)
			out, err := cmd.CombinedOutput()
			if err != nil || !strings.Contains(string(out), "server01") {
				t.Fatalf("%s completion: %v\n%s", shell, err, out)
			}
		})
	}
}

func TestZshCompletionSplitsHostsAndCommands(t *testing.T) {
	zsh, err := exec.LookPath("zsh")
	if err != nil {
		t.Skip("zsh unavailable")
	}
	dir := t.TempDir()
	backend := "#!/bin/sh\nprintf 'web01\\nweb:02\\ncache\\tManage the cache\\n:36\\n'\n"
	if err := os.WriteFile(filepath.Join(dir, "netssh"), []byte(backend), 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(dir, "_netssh"), []byte(hook.ZshCompletionScript), 0o644); err != nil {
		t.Fatal(err)
	}
	script := `compdef() { :; }
source "$DIR/_netssh"
_describe() { print -r -- "describe ${(P)4}"; }
compadd() { print -r -- "compadd $*"; }
_files() { print -r -- files; }
words=(netssh "")
CURRENT=2
_netssh
`
	cmd := exec.Command(zsh, "-f", "-c", script)
	cmd.Env = append(os.Environ(), "DIR="+dir, "PATH="+dir+string(os.PathListSeparator)+os.Getenv("PATH"))
	out, err := cmd.CombinedOutput()
	if err != nil {
		t.Fatalf("%v\n%s", err, out)
	}
	// Directive 36 = NoFileComp|KeepOrder: unsorted host group, no file fallback.
	want := "describe cache:Manage the cache\ncompadd -V hosts -X %Bhosts%b -- web01 web:02\n"
	if string(out) != want {
		t.Fatalf("got:\n%s\nwant:\n%s", out, want)
	}
}