package zsh

import (
	"context"
	"os"
	"path/filepath"
	"testing"

	"gitlab.hive-brain.de/MDietermann/Archduino/internal/config"
	"gitlab.hive-brain.de/MDietermann/Archduino/internal/module"
	"gitlab.hive-brain.de/MDietermann/Archduino/internal/platform"
)

type fakeRunner struct {
	runCalls  [][]string
	outCalls  [][]string
	installed map[string]bool
}

func (f *fakeRunner) Run(_ context.Context, name string, args ...string) error {
	f.runCalls = append(f.runCalls, append([]string{name}, args...))
	return nil
}
func (f *fakeRunner) Output(_ context.Context, name string, args ...string) ([]byte, error) {
	f.outCalls = append(f.outCalls, append([]string{name}, args...))
	if name == "pacman" && len(args) == 2 && args[0] == "-Q" {
		if f.installed[args[1]] {
			return []byte("ok"), nil
		}
		return nil, errOne
	}
	return nil, nil
}

type eo struct{}

func (eo) Error() string { return "exit 1" }

var errOne = eo{}

type nopReporter struct{}

func (nopReporter) Progress(string, int, int, string) {}
func (nopReporter) Log(string, string)                {}

func TestZshDetectAbsent(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	r := &fakeRunner{installed: map[string]bool{}}
	m := New(config.ZshConfig{
		OhMyZshRepo: "https://x/omz.git",
		Plugins:     []config.ZshPlugin{{Name: "zsh-autosuggestions", Repo: "https://x/a.git"}},
	}, platform.NewPacman(r), platform.GitClient{Runner: r})
	st, _ := m.Detect(context.Background())
	s := st.(state)
	if s.ZshInstalled {
		t.Error("want zsh absent")
	}
	if s.OMZInstalled {
		t.Error("want omz absent")
	}
	if len(s.MissingPlugins) != 1 {
		t.Errorf("want 1 plugin missing, got %v", s.MissingPlugins)
	}
}

func TestZshDetectAllPresent(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	os.MkdirAll(filepath.Join(home, ".oh-my-zsh"), 0o755)
	os.MkdirAll(filepath.Join(home, ".oh-my-zsh", "custom", "plugins", "zsh-autosuggestions", ".git"), 0o755)
	r := &fakeRunner{installed: map[string]bool{"zsh": true}}
	m := New(config.ZshConfig{
		OhMyZshRepo: "https://x/omz.git",
		Plugins:     []config.ZshPlugin{{Name: "zsh-autosuggestions", Repo: "https://x/a.git"}},
	}, platform.NewPacman(r), platform.GitClient{Runner: r})
	st, _ := m.Detect(context.Background())
	s := st.(state)
	if !s.ZshInstalled || !s.OMZInstalled || len(s.MissingPlugins) != 0 {
		t.Fatalf("want all present, got %+v", s)
	}
}

func TestZshPlanApplyInstallsEverything(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	r := &fakeRunner{installed: map[string]bool{}}
	m := New(config.ZshConfig{
		OhMyZshRepo: "https://x/omz.git",
		Plugins:     []config.ZshPlugin{{Name: "zsh-autosuggestions", Repo: "https://x/a.git"}},
	}, platform.NewPacman(r), platform.GitClient{Runner: r})
	st, _ := m.Detect(context.Background())
	p, _ := m.Plan(context.Background(), st)
	if len(p.Actions) == 0 {
		t.Fatal("want non-empty plan")
	}
	if err := m.Apply(context.Background(), p, nopReporter{}); err != nil {
		t.Fatal(err)
	}
	sawPacman, sawOMZ, sawPlugin := false, false, false
	for _, c := range r.runCalls {
		if len(c) >= 3 && c[0] == "sudo" && c[1] == "pacman" {
			sawPacman = true
		}
		if len(c) >= 4 && c[0] == "git" && c[3] == "https://x/omz.git" {
			sawOMZ = true
		}
		if len(c) >= 4 && c[0] == "git" && c[3] == "https://x/a.git" {
			sawPlugin = true
		}
	}
	if !sawPacman || !sawOMZ || !sawPlugin {
		t.Fatalf("missing step; calls=%v", r.runCalls)
	}
}

func TestPlanForceReinstallsEverything(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	os.MkdirAll(filepath.Join(home, ".oh-my-zsh", ".git"), 0o755)
	os.MkdirAll(filepath.Join(home, ".oh-my-zsh", "custom", "plugins", "zsh-autosuggestions", ".git"), 0o755)
	r := &fakeRunner{installed: map[string]bool{"zsh": true}}
	m := New(config.ZshConfig{
		OhMyZshRepo: "https://x/omz.git",
		Plugins:     []config.ZshPlugin{{Name: "zsh-autosuggestions", Repo: "https://x/a.git"}},
	}, platform.NewPacman(r), platform.GitClient{Runner: r})
	plan, err := m.PlanForce(context.Background())
	if err != nil {
		t.Fatalf("PlanForce: %v", err)
	}
	if plan.IsEmpty() {
		t.Fatal("force plan must not be empty")
	}
	for _, a := range plan.Actions {
		if err := a.Exec(context.Background()); err != nil {
			t.Fatalf("Exec: %v", err)
		}
	}
	sawReinstall, sawOMZ, sawPlugin := false, false, false
	for _, c := range r.runCalls {
		if len(c) >= 4 && c[0] == "sudo" && c[1] == "pacman" && c[2] == "-S" && c[3] == "--noconfirm" {
			sawReinstall = true
		}
		if len(c) >= 4 && c[0] == "git" && c[3] == "https://x/omz.git" {
			sawOMZ = true
		}
		if len(c) >= 4 && c[0] == "git" && c[3] == "https://x/a.git" {
			sawPlugin = true
		}
	}
	if !sawReinstall || !sawOMZ || !sawPlugin {
		t.Fatalf("missing force action; calls=%v", r.runCalls)
	}
	if _, err := os.Stat(filepath.Join(home, ".oh-my-zsh")); !os.IsNotExist(err) {
		t.Fatalf("oh-my-zsh dir should have been removed; stat err=%v", err)
	}
}

var _ module.Module = Module{}