package tests

import (
	"bytes"
	"os"
	"path/filepath"
	"testing"
	"time"

	"github.com/versenilvis/iris/config"
	"github.com/versenilvis/iris/root"
)

func TestDefaultConfigAndState(t *testing.T) {
	cfg := config.DefaultConfig()
	if cfg.Core.Version != 1 {
		t.Errorf("expected version 1, got %d", cfg.Core.Version)
	}
	if cfg.UI.MaxSuggestions != 100 {
		t.Errorf("expected suggestions 100, got %d", cfg.UI.MaxSuggestions)
	}

	state := config.DefaultState()
	if state.LastMode != "spec" {
		t.Errorf("expected last mode spec, got %q", state.LastMode)
	}
}

func TestCustomDuration(t *testing.T) {
	var dur config.Duration
	err := dur.UnmarshalText([]byte("6h"))
	if err != nil {
		t.Fatalf("unexpected error unmarshalling duration: %v", err)
	}
	if time.Duration(dur) != 6*time.Hour {
		t.Errorf("expected 6 hours, got %v", time.Duration(dur))
	}

	b, err := dur.MarshalText()
	if err != nil {
		t.Fatalf("unexpected error marshaling duration: %v", err)
	}
	if string(b) != "6h0m0s" {
		t.Errorf("expected 6h0m0s, got %q", string(b))
	}

	err = dur.UnmarshalText([]byte("invalid"))
	if err == nil {
		t.Errorf("expected error for invalid duration")
	}
}

func TestValidationAndEnvironmentOverrides(t *testing.T) {
	tmpDir, err := os.MkdirTemp("", "iris-config-env-test")
	if err != nil {
		t.Fatalf("failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	_ = os.Setenv("XDG_CONFIG_HOME", tmpDir)
	defer func() { _ = os.Unsetenv("XDG_CONFIG_HOME") }()

	_ = os.Setenv("IRIS_CORE_DEBUG", "true")
	_ = os.Setenv("IRIS_CORE_SHELL", "fish")
	_ = os.Setenv("IRIS_CORE_MODE", "history")
	_ = os.Setenv("IRIS_UI_GHOST_TEXT", "false")
	_ = os.Setenv("IRIS_UI_MAX_SUGGESTIONS", "250")
	_ = os.Setenv("IRIS_UI_MAX_HEIGHT", "25")
	_ = os.Setenv("IRIS_UPDATER_CHANNEL", "nightly")
	_ = os.Setenv("IRIS_UPDATER_INTERVAL", "12h")
	_ = os.Setenv("IRIS_UPDATER_CHECK_ON_STARTUP", "false")

	defer func() {
		_ = os.Unsetenv("IRIS_CORE_DEBUG")
		_ = os.Unsetenv("IRIS_CORE_SHELL")
		_ = os.Unsetenv("IRIS_CORE_MODE")
		_ = os.Unsetenv("IRIS_UI_GHOST_TEXT")
		_ = os.Unsetenv("IRIS_UI_MAX_SUGGESTIONS")
		_ = os.Unsetenv("IRIS_UI_MAX_HEIGHT")
		_ = os.Unsetenv("IRIS_UPDATER_CHANNEL")
		_ = os.Unsetenv("IRIS_UPDATER_INTERVAL")
		_ = os.Unsetenv("IRIS_UPDATER_CHECK_ON_STARTUP")
	}()

	cfg, err := config.Load()
	if err != nil {
		t.Fatalf("failed to load config: %v", err)
	}

	if !cfg.Core.Debug {
		t.Errorf("expected debug to be true")
	}
	if cfg.Core.Shell != "fish" {
		t.Errorf("expected shell fish, got %q", cfg.Core.Shell)
	}
	if cfg.Core.Mode != "history" {
		t.Errorf("expected mode history, got %q", cfg.Core.Mode)
	}
	if cfg.UI.GhostText {
		t.Errorf("expected ghost text to be false")
	}
	if cfg.UI.MaxSuggestions != 250 {
		t.Errorf("expected max suggestions 250, got %d", cfg.UI.MaxSuggestions)
	}
	if cfg.UI.MaxHeight != 25 {
		t.Errorf("expected max height 25, got %d", cfg.UI.MaxHeight)
	}
	if cfg.Updater.Channel != "nightly" {
		t.Errorf("expected channel nightly, got %q", cfg.Updater.Channel)
	}
	if time.Duration(cfg.Updater.CheckInterval) != 12*time.Hour {
		t.Errorf("expected 12h, got %v", time.Duration(cfg.Updater.CheckInterval))
	}
	if cfg.Updater.CheckOnStartup {
		t.Errorf("expected check on startup to be false")
	}

	_ = os.Setenv("IRIS_CORE_MODE", "invalid")
	_, err = config.Load()
	if err == nil {
		t.Errorf("expected validation error for invalid mode in env")
	}
}

func TestLoadSave(t *testing.T) {
	tmpDir, err := os.MkdirTemp("", "iris-config-test")
	if err != nil {
		t.Fatalf("failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	_ = os.Setenv("XDG_CONFIG_HOME", tmpDir)
	defer func() { _ = os.Unsetenv("XDG_CONFIG_HOME") }()

	cfg, err := config.Load()
	if err != nil {
		t.Fatalf("failed to load: %v", err)
	}

	cfg.Core.Shell = "zsh"
	cfg.UI.MaxHeight = 20

	err = config.Save(cfg)
	if err != nil {
		t.Fatalf("failed to save: %v", err)
	}

	loaded, err := config.Load()
	if err != nil {
		t.Fatalf("failed to load after save: %v", err)
	}

	if loaded.Core.Shell != "zsh" {
		t.Errorf("expected loaded shell to be zsh, got %q", loaded.Core.Shell)
	}
	if loaded.UI.MaxHeight != 20 {
		t.Errorf("expected loaded height to be 20, got %d", loaded.UI.MaxHeight)
	}
}

func TestMigration(t *testing.T) {
	tmpDir, err := os.MkdirTemp("", "iris-migrate-test")
	if err != nil {
		t.Fatalf("failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	_ = os.Setenv("HOME", tmpDir)
	_ = os.Setenv("XDG_DATA_HOME", filepath.Join(tmpDir, ".local", "share"))
	defer func() {
		_ = os.Unsetenv("HOME")
		_ = os.Unsetenv("XDG_DATA_HOME")
	}()

	legacyDir := filepath.Join(tmpDir, ".iris")
	if errMkdir := os.MkdirAll(legacyDir, 0755); errMkdir != nil {
		t.Fatalf("failed to create legacy dir: %v", errMkdir)
	}

	legacyStateJson := `{"mode": "history"}`
	_ = os.WriteFile(filepath.Join(legacyDir, "state.json"), []byte(legacyStateJson), 0644)

	legacyUpdateJson := `{"seen_version": "v1.2.3", "last_check": 1234567890}`
	_ = os.WriteFile(filepath.Join(legacyDir, "update_state.json"), []byte(legacyUpdateJson), 0644)

	err = config.MigrateFromLegacyJSON()
	if err != nil {
		t.Fatalf("migration failed: %v", err)
	}

	state := config.LoadState()
	if state.LastMode != "history" {
		t.Errorf("expected migrated last mode 'history', got %q", state.LastMode)
	}
	if state.Updater.SeenVersion != "v1.2.3" {
		t.Errorf("expected migrated seen version 'v1.2.3', got %q", state.Updater.SeenVersion)
	}
	if state.Updater.LastCheckTime.Unix() != 1234567890 {
		t.Errorf("expected migrated check time 1234567890, got %v", state.Updater.LastCheckTime.Unix())
	}

	if _, err := os.Stat(filepath.Join(legacyDir, "state.json.bak")); err != nil {
		t.Errorf("expected backup file state.json.bak to exist")
	}
	if _, err := os.Stat(filepath.Join(legacyDir, "update_state.json.bak")); err != nil {
		t.Errorf("expected backup file update_state.json.bak to exist")
	}
}

func TestConfigCommands(t *testing.T) {
	tmpDir, err := os.MkdirTemp("", "iris-config-cmd-test")
	if err != nil {
		t.Fatalf("failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	origConfigHome := os.Getenv("XDG_CONFIG_HOME")
	defer func() {
		_ = os.Setenv("XDG_CONFIG_HOME", origConfigHome)
	}()
	_ = os.Setenv("XDG_CONFIG_HOME", tmpDir)

	root.ConfigInitCmd.Run(root.ConfigInitCmd, []string{})

	configPath := filepath.Join(tmpDir, "iris", "config.toml")
	if _, err := os.Stat(configPath); err != nil {
		t.Errorf("expected config file to be created at %s, but it was not", configPath)
	}

	buf := new(bytes.Buffer)
	root.ConfigShowCmd.SetOut(buf)
	root.ConfigShowCmd.Run(root.ConfigShowCmd, []string{})
	if buf.Len() == 0 {
		t.Errorf("expected show command to output configuration")
	}
}