package fs

import (
	"context"
	"errors"
	"os"
	"path/filepath"
	"slices"
	"testing"
	"time"

	"github.com/versenilvis/iris/spec"
)

func TestZoxideSourceCachesDirectoriesAndErrors(t *testing.T) {
	now := time.Date(2026, time.August, 14, 12, 0, 0, 0, time.UTC)
	calls := 0
	source := newZoxideSource(func(context.Context) ([]byte, error) {
		calls++
		return []byte("/tmp/Project One \n/tmp/Проект\r\n"), nil
	})
	source.now = func() time.Time { return now }

	want := []string{"/tmp/Project One ", "/tmp/Проект"}
	for range 2 {
		got, err := source.directories()
		if err != nil {
			t.Fatalf("directories returned an error: %v", err)
		}
		if !slices.Equal(got, want) {
			t.Fatalf("directories = %q, want %q", got, want)
		}
	}
	if calls != 1 {
		t.Fatalf("query calls = %d, want 1", calls)
	}

	now = now.Add(zoxideCacheTTL)
	if _, err := source.directories(); err != nil {
		t.Fatalf("directories after cache expiry returned an error: %v", err)
	}
	if calls != 2 {
		t.Fatalf("query calls after cache expiry = %d, want 2", calls)
	}

	wantErr := errors.New("zoxide unavailable")
	errorCalls := 0
	errorSource := newZoxideSource(func(context.Context) ([]byte, error) {
		errorCalls++
		return nil, wantErr
	})
	if _, err := errorSource.directories(); !errors.Is(err, wantErr) {
		t.Fatalf("directories error = %v, want %v", err, wantErr)
	}
	if _, err := errorSource.directories(); !errors.Is(err, wantErr) {
		t.Fatalf("cached directories error = %v, want %v", err, wantErr)
	}
	if errorCalls != 1 {
		t.Fatalf("failed query calls = %d, want 1", errorCalls)
	}
}

func TestZoxideGeneratorMergesValidDirectories(t *testing.T) {
	cwd := t.TempDir()
	local := filepath.Join(cwd, "project")
	external := filepath.Join(t.TempDir(), "My Проект")
	missing := filepath.Join(t.TempDir(), "deleted")
	mustMkdirAll(t, local)
	mustMkdirAll(t, external)

	previousCWD := spec.GetCWD()
	spec.SetCWD(cwd)
	t.Cleanup(func() { spec.SetCWD(previousCWD) })

	gen := newZoxideGenerator(func() ([]string, error) {
		return []string{local, external, external, missing}, nil
	})
	results := gen([]string{"z", ""}, "z ", "")

	if len(results) != 2 {
		t.Fatalf("suggestion count = %d, want 2: %#v", len(results), results)
	}
	if results[0].Cmd != "project/" {
		t.Fatalf("first suggestion = %q, want local project/", results[0].Cmd)
	}
	if results[1].Cmd != external {
		t.Fatalf("second suggestion = %q, want %q", results[1].Cmd, external)
	}
	if results[1].Priority != 40 {
		t.Fatalf("external priority = %d, want 40", results[1].Priority)
	}
}

func TestZoxideGeneratorFiltersAndFallsBack(t *testing.T) {
	cwd := t.TempDir()
	nested := filepath.Join(cwd, "nested", "child")
	mustMkdirAll(t, nested)

	previousCWD := spec.GetCWD()
	spec.SetCWD(cwd)
	t.Cleanup(func() { spec.SetCWD(previousCWD) })

	calls := 0
	gen := newZoxideGenerator(func() ([]string, error) {
		calls++
		return nil, errors.New("zoxide unavailable")
	})

	results := gen([]string{"z", "nested/ch"}, "z ", "nested/ch")
	if calls != 0 {
		t.Fatalf("source calls for explicit path = %d, want 0", calls)
	}
	if len(results) != 1 || results[0].Cmd != "nested/child/" {
		t.Fatalf("explicit path suggestions = %#v", results)
	}

	results = gen([]string{"z", "n"}, "z ", "n")
	if calls != 1 {
		t.Fatalf("source calls after name query = %d, want 1", calls)
	}
	if len(results) != 1 || results[0].Cmd != "nested/" {
		t.Fatalf("fallback suggestions = %#v", results)
	}

	empty := newZoxideGenerator(func() ([]string, error) { return nil, nil })
	if results := empty([]string{"z", "missing"}, "z ", "missing"); len(results) != 0 {
		t.Fatalf("empty database suggestions = %#v, want none", results)
	}
}

func TestZoxideGeneratorFuzzyMatchesUnicodeAndLookupQuotesSpaces(t *testing.T) {
	cwd := t.TempDir()
	target := filepath.Join(t.TempDir(), "My Awesome $Проект")
	mustMkdirAll(t, target)

	previousCWD := spec.GetCWD()
	spec.SetCWD(cwd)
	t.Cleanup(func() { spec.SetCWD(previousCWD) })

	const command = "zoxide-test-command"
	spec.Register(&spec.Spec{
		Name:      command,
		MaxArgs:   0,
		Generator: newZoxideGenerator(func() ([]string, error) { return []string{target}, nil }),
	})
	t.Cleanup(func() { delete(spec.Registry, command) })

	results := spec.Lookup(command + " My Awe")
	want := command + ` '` + target + `'`
	if len(results) != 1 || results[0].Cmd != want {
		t.Fatalf("lookup suggestions = %#v, want command %q", results, want)
	}
}

func TestDisplayDirectoryOnlyShortensHomePrefix(t *testing.T) {
	home := filepath.Join(string(os.PathSeparator), "Users", "example")
	inside := filepath.Join(home, "Developer", "Проект")
	outside := filepath.Join(string(os.PathSeparator), "tmp", "Users", "example", "data")

	if got := displayDirectory(home, home); got != "~" {
		t.Fatalf("displayDirectory(home) = %q, want ~", got)
	}
	if got := displayDirectory(inside, home); got != filepath.Join("~", "Developer", "Проект") {
		t.Fatalf("displayDirectory(inside) = %q", got)
	}
	if got := displayDirectory(outside, home); got != outside {
		t.Fatalf("displayDirectory(outside) = %q, want %q", got, outside)
	}
}

func mustMkdirAll(t *testing.T, path string) {
	t.Helper()
	if err := os.MkdirAll(path, 0o755); err != nil {
		t.Fatalf("create directory %q: %v", path, err)
	}
}