package matugen

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"math"
	"os"
	"os/exec"
	"path/filepath"
	"strconv"
	"strings"
	"sync"
	"syscall"
	"time"

	"github.com/AvengeMedia/DankMaterialShell/core/internal/dank16"
	"github.com/AvengeMedia/DankMaterialShell/core/internal/log"
	"github.com/AvengeMedia/DankMaterialShell/core/internal/utils"
	"github.com/lucasb-eyer/go-colorful"
)

var ErrNoChanges = errors.New("no color changes")

type ColorMode string

const (
	ColorModeDark  ColorMode = "dark"
	ColorModeLight ColorMode = "light"
)

type TemplateKind int

const (
	TemplateKindNormal TemplateKind = iota
	TemplateKindTerminal
	TemplateKindGTK
	TemplateKindVSCode
	TemplateKindEmacs
)

type TemplateDef struct {
	ID                 string
	Commands           []string
	Flatpaks           []string
	ConfigFile         string
	Kind               TemplateKind
	RunUnconditionally bool
}

var templateRegistry = []TemplateDef{
	{ID: "gtk", Kind: TemplateKindGTK, RunUnconditionally: true},
	{ID: "niri", Commands: []string{"niri"}, ConfigFile: "niri.toml"},
	{ID: "hyprland", Commands: []string{"Hyprland"}, ConfigFile: "hyprland.toml"},
	{ID: "mangowc", Commands: []string{"mango"}, ConfigFile: "mangowc.toml"},
	{ID: "qt5ct", Commands: []string{"qt5ct"}, ConfigFile: "qt5ct.toml"},
	{ID: "qt6ct", Commands: []string{"qt6ct"}, ConfigFile: "qt6ct.toml"},
	{ID: "firefox", Commands: []string{"firefox"}, ConfigFile: "firefox.toml"},
	{ID: "pywalfox", Commands: []string{"pywalfox"}, ConfigFile: "pywalfox.toml"},
	{ID: "zenbrowser", Commands: []string{"zen", "zen-browser", "zen-beta", "zen-twilight"}, Flatpaks: []string{"app.zen_browser.zen"}, ConfigFile: "zenbrowser.toml"},
	{ID: "vesktop", Commands: []string{"vesktop"}, Flatpaks: []string{"dev.vencord.Vesktop"}, ConfigFile: "vesktop.toml"},
	{ID: "equibop", Commands: []string{"equibop"}, ConfigFile: "equibop.toml"},
	{ID: "ghostty", Commands: []string{"ghostty"}, ConfigFile: "ghostty.toml", Kind: TemplateKindTerminal},
	{ID: "kitty", Commands: []string{"kitty"}, ConfigFile: "kitty.toml", Kind: TemplateKindTerminal},
	{ID: "foot", Commands: []string{"foot"}, ConfigFile: "foot.toml", Kind: TemplateKindTerminal},
	{ID: "alacritty", Commands: []string{"alacritty"}, ConfigFile: "alacritty.toml", Kind: TemplateKindTerminal},
	{ID: "wezterm", Commands: []string{"wezterm"}, ConfigFile: "wezterm.toml", Kind: TemplateKindTerminal},
	{ID: "nvim", Commands: []string{"nvim"}, ConfigFile: "neovim.toml", Kind: TemplateKindTerminal},
	{ID: "dgop", Commands: []string{"dgop"}, ConfigFile: "dgop.toml"},
	{ID: "kcolorscheme", ConfigFile: "kcolorscheme.toml", RunUnconditionally: true},
	{ID: "vscode", Kind: TemplateKindVSCode},
	{ID: "emacs", Commands: []string{"emacs"}, ConfigFile: "emacs.toml", Kind: TemplateKindEmacs},
	{ID: "zed", Commands: []string{"zed", "zeditor", "zedit"}, ConfigFile: "zed.toml"},
}

func (c *ColorMode) GTKTheme() string {
	switch *c {
	case ColorModeDark:
		return "adw-gtk3-dark"
	default:
		return "adw-gtk3"
	}
}

var (
	matugenVersionMu   sync.Mutex
	matugenVersionOK   bool
	matugenSupportsCOE bool
	matugenIsV4        bool
)

type Options struct {
	StateDir            string
	ShellDir            string
	ConfigDir           string
	Kind                string
	Value               string
	Mode                ColorMode
	IconTheme           string
	MatugenType         string
	Contrast            float64
	RunUserTemplates    bool
	ColorsOnly          bool
	StockColors         string
	SyncModeWithPortal  bool
	TerminalsAlwaysDark bool
	SkipTemplates       string
	AppChecker          utils.AppChecker
}

type ColorsOutput struct {
	Colors struct {
		Dark  map[string]string `json:"dark"`
		Light map[string]string `json:"light"`
	} `json:"colors"`
}

func (o *Options) ColorsOutput() string {
	return filepath.Join(o.StateDir, "dms-colors.json")
}

func (o *Options) ShouldSkipTemplate(name string) bool {
	if o.SkipTemplates == "" {
		return false
	}
	for _, skip := range strings.Split(o.SkipTemplates, ",") {
		if strings.TrimSpace(skip) == name {
			return true
		}
	}
	return false
}

func Run(opts Options) error {
	if opts.StateDir == "" {
		return fmt.Errorf("state-dir is required")
	}
	if opts.ShellDir == "" {
		return fmt.Errorf("shell-dir is required")
	}
	if opts.ConfigDir == "" {
		return fmt.Errorf("config-dir is required")
	}
	if opts.Kind == "" {
		return fmt.Errorf("kind is required")
	}
	if opts.Value == "" {
		return fmt.Errorf("value is required")
	}
	if opts.Mode == "" {
		opts.Mode = ColorModeDark
	}
	if opts.MatugenType == "" {
		opts.MatugenType = "scheme-tonal-spot"
	}
	if opts.IconTheme == "" {
		opts.IconTheme = "System Default"
	}
	if opts.AppChecker == nil {
		opts.AppChecker = utils.DefaultAppChecker{}
	}

	if err := os.MkdirAll(opts.StateDir, 0o755); err != nil {
		return fmt.Errorf("failed to create state dir: %w", err)
	}

	log.Infof("Building theme: %s %s (%s)", opts.Kind, opts.Value, opts.Mode)

	changed, buildErr := buildOnce(&opts)
	if buildErr != nil {
		return buildErr
	}

	if !changed {
		log.Info("No color changes detected, skipping refresh")
		return ErrNoChanges
	}

	if opts.SyncModeWithPortal {
		syncColorScheme(opts.Mode)
	}

	log.Info("Done")
	return nil
}

func buildOnce(opts *Options) (bool, error) {
	cfgFile, err := os.CreateTemp("", "matugen-config-*.toml")
	if err != nil {
		return false, fmt.Errorf("failed to create temp config: %w", err)
	}
	defer os.Remove(cfgFile.Name())
	defer cfgFile.Close()

	tmpDir, err := os.MkdirTemp("", "matugen-templates-*")
	if err != nil {
		return false, fmt.Errorf("failed to create temp dir: %w", err)
	}
	defer os.RemoveAll(tmpDir)

	if err := buildMergedConfig(opts, cfgFile, tmpDir); err != nil {
		return false, fmt.Errorf("failed to build config: %w", err)
	}
	cfgFile.Close()

	oldColors, _ := os.ReadFile(opts.ColorsOutput())

	var primaryDark, primaryLight, surface string
	var dank16JSON string
	var importArgs []string

	if opts.StockColors != "" {
		log.Info("Using stock/custom theme colors with matugen base")
		primaryDark = extractNestedColor(opts.StockColors, "primary", "dark")
		primaryLight = extractNestedColor(opts.StockColors, "primary", "light")
		surface = extractNestedColor(opts.StockColors, "surface", "dark")

		if primaryDark == "" {
			return false, fmt.Errorf("failed to extract primary dark from stock colors")
		}
		if primaryLight == "" {
			primaryLight = primaryDark
		}

		dank16JSON = generateDank16Variants(primaryDark, primaryLight, surface, opts.Mode)
		importData := fmt.Sprintf(`{"colors": %s, "dank16": %s}`, opts.StockColors, dank16JSON)
		importArgs = []string{"--import-json-string", importData}

		log.Info("Running matugen color hex with stock color overrides")
		args := []string{"color", "hex", primaryDark, "-m", string(opts.Mode), "-t", opts.MatugenType, "-c", cfgFile.Name()}
		args = appendContrastArg(args, opts.Contrast)
		args = append(args, importArgs...)
		if err := runMatugen(args); err != nil {
			return false, err
		}
	} else {
		log.Infof("Using dynamic theme from %s: %s", opts.Kind, opts.Value)

		matJSON, err := runMatugenDryRun(opts)
		if err != nil {
			return false, fmt.Errorf("matugen dry-run failed: %w", err)
		}

		primaryDark = extractMatugenColor(matJSON, "primary", "dark")
		primaryLight = extractMatugenColor(matJSON, "primary", "light")
		surface = extractMatugenColor(matJSON, "surface", "dark")

		if primaryDark == "" {
			return false, fmt.Errorf("failed to extract primary color")
		}
		if primaryLight == "" {
			primaryLight = primaryDark
		}

		dank16JSON = generateDank16Variants(primaryDark, primaryLight, surface, opts.Mode)
		importData := fmt.Sprintf(`{"dank16": %s}`, dank16JSON)
		importArgs = []string{"--import-json-string", importData}

		log.Infof("Running matugen %s with dank16 injection", opts.Kind)
		var args []string
		switch opts.Kind {
		case "hex":
			args = []string{"color", "hex", opts.Value}
		default:
			args = []string{opts.Kind, opts.Value}
		}
		args = append(args, "-m", string(opts.Mode), "-t", opts.MatugenType, "-c", cfgFile.Name())
		args = appendContrastArg(args, opts.Contrast)
		args = append(args, importArgs...)
		if err := runMatugen(args); err != nil {
			return false, err
		}
	}

	newColors, _ := os.ReadFile(opts.ColorsOutput())
	if bytes.Equal(oldColors, newColors) && len(oldColors) > 0 {
		return false, nil
	}

	if opts.ColorsOnly {
		return true, nil
	}

	if isDMSGTKActive(opts.ConfigDir) {
		switch opts.Mode {
		case ColorModeLight:
			syncAccentColor(primaryLight)
		default:
			syncAccentColor(primaryDark)
		}
		refreshGTK(opts.Mode)
		refreshGTK4()
	}

	if !opts.ShouldSkipTemplate("qt6ct") && appExists(opts.AppChecker, []string{"qt6ct"}, nil) {
		refreshQt6ct()
	}

	signalTerminals(opts)

	return true, nil
}

func appendContrastArg(args []string, contrast float64) []string {
	if contrast == 0 {
		return args
	}
	return append(args, "--contrast", strconv.FormatFloat(contrast, 'f', -1, 64))
}

func buildMergedConfig(opts *Options, cfgFile *os.File, tmpDir string) error {
	userConfigPath := filepath.Join(opts.ConfigDir, "matugen", "config.toml")

	wroteConfig := false
	if opts.RunUserTemplates {
		if data, err := os.ReadFile(userConfigPath); err == nil {
			configSection := extractTOMLSection(string(data), "[config]", "[templates]")
			if configSection != "" {
				cfgFile.WriteString(configSection)
				cfgFile.WriteString("\n")
				wroteConfig = true
			}
		}
	}
	if !wroteConfig {
		cfgFile.WriteString("[config]\n\n")
	}

	baseConfigPath := filepath.Join(opts.ShellDir, "matugen", "configs", "base.toml")
	if data, err := os.ReadFile(baseConfigPath); err == nil {
		content := string(data)
		lines := strings.Split(content, "\n")
		for _, line := range lines {
			if strings.TrimSpace(line) == "[config]" {
				continue
			}
			cfgFile.WriteString(substituteVars(line, opts.ShellDir) + "\n")
		}
		cfgFile.WriteString("\n")
	}

	fmt.Fprintf(cfgFile, `[templates.dank]
input_path = '%s/matugen/templates/dank.json'
output_path = '%s'

`, opts.ShellDir, opts.ColorsOutput())

	if opts.ColorsOnly {
		return nil
	}

	homeDir, _ := os.UserHomeDir()
	for _, tmpl := range templateRegistry {
		if opts.ShouldSkipTemplate(tmpl.ID) {
			continue
		}

		switch tmpl.Kind {
		case TemplateKindGTK:
			switch opts.Mode {
			case ColorModeLight:
				appendConfig(opts, cfgFile, nil, nil, "gtk3-light.toml")
			default:
				appendConfig(opts, cfgFile, nil, nil, "gtk3-dark.toml")
			}
		case TemplateKindTerminal:
			appendTerminalConfig(opts, cfgFile, tmpDir, tmpl.Commands, tmpl.Flatpaks, tmpl.ConfigFile)
		case TemplateKindVSCode:
			appendVSCodeConfig(cfgFile, "vscode", filepath.Join(homeDir, ".vscode/extensions"), opts.ShellDir)
			appendVSCodeConfig(cfgFile, "codium", filepath.Join(homeDir, ".vscode-oss/extensions"), opts.ShellDir)
			appendVSCodeConfig(cfgFile, "codeoss", filepath.Join(homeDir, ".config/Code - OSS/extensions"), opts.ShellDir)
			appendVSCodeConfig(cfgFile, "cursor", filepath.Join(homeDir, ".cursor/extensions"), opts.ShellDir)
			appendVSCodeConfig(cfgFile, "windsurf", filepath.Join(homeDir, ".windsurf/extensions"), opts.ShellDir)
			appendVSCodeConfig(cfgFile, "vscode-insiders", filepath.Join(homeDir, ".vscode-insiders/extensions"), opts.ShellDir)
		case TemplateKindEmacs:
			if utils.EmacsConfigDir() != "" {
				appendConfig(opts, cfgFile, tmpl.Commands, tmpl.Flatpaks, tmpl.ConfigFile)
			}
		default:
			appendConfig(opts, cfgFile, tmpl.Commands, tmpl.Flatpaks, tmpl.ConfigFile)
		}
	}

	if opts.RunUserTemplates {
		if data, err := os.ReadFile(userConfigPath); err == nil {
			templatesSection := extractTOMLSection(string(data), "[templates]", "")
			if templatesSection != "" {
				cfgFile.WriteString(templatesSection)
				cfgFile.WriteString("\n")
			}
		}
	}

	userPluginConfigDir := filepath.Join(opts.ConfigDir, "matugen", "dms", "configs")
	if entries, err := os.ReadDir(userPluginConfigDir); err == nil {
		for _, entry := range entries {
			if !strings.HasSuffix(entry.Name(), ".toml") {
				continue
			}
			if data, err := os.ReadFile(filepath.Join(userPluginConfigDir, entry.Name())); err == nil {
				cfgFile.WriteString(string(data))
				cfgFile.WriteString("\n")
			}
		}
	}

	return nil
}

func appendConfig(
	opts *Options,
	cfgFile *os.File,
	checkCmd []string,
	checkFlatpaks []string,
	fileName string,
) {
	configPath := filepath.Join(opts.ShellDir, "matugen", "configs", fileName)
	if _, err := os.Stat(configPath); err != nil {
		return
	}
	if !appExists(opts.AppChecker, checkCmd, checkFlatpaks) {
		return
	}
	data, err := os.ReadFile(configPath)
	if err != nil {
		return
	}
	cfgFile.WriteString(substituteVars(string(data), opts.ShellDir))
	cfgFile.WriteString("\n")
}

func appendTerminalConfig(opts *Options, cfgFile *os.File, tmpDir string, checkCmd []string, checkFlatpaks []string, fileName string) {
	configPath := filepath.Join(opts.ShellDir, "matugen", "configs", fileName)
	if _, err := os.Stat(configPath); err != nil {
		return
	}
	if !appExists(opts.AppChecker, checkCmd, checkFlatpaks) {
		return
	}
	data, err := os.ReadFile(configPath)
	if err != nil {
		return
	}

	content := string(data)

	if !opts.TerminalsAlwaysDark {
		cfgFile.WriteString(substituteVars(content, opts.ShellDir))
		cfgFile.WriteString("\n")
		return
	}

	lines := strings.Split(content, "\n")
	for _, line := range lines {
		if !strings.Contains(line, "input_path") || !strings.Contains(line, "SHELL_DIR/matugen/templates/") {
			continue
		}

		start := strings.Index(line, "'SHELL_DIR/matugen/templates/")
		if start == -1 {
			continue
		}
		end := strings.Index(line[start+1:], "'")
		if end == -1 {
			continue
		}
		templateName := line[start+len("'SHELL_DIR/matugen/templates/") : start+1+end]
		origPath := filepath.Join(opts.ShellDir, "matugen", "templates", templateName)

		origData, err := os.ReadFile(origPath)
		if err != nil {
			continue
		}

		modified := strings.ReplaceAll(string(origData), ".default.", ".dark.")
		tmpPath := filepath.Join(tmpDir, templateName)
		if err := os.WriteFile(tmpPath, []byte(modified), 0o644); err != nil {
			continue
		}

		content = strings.ReplaceAll(content,
			fmt.Sprintf("'SHELL_DIR/matugen/templates/%s'", templateName),
			fmt.Sprintf("'%s'", tmpPath))
	}

	cfgFile.WriteString(substituteVars(content, opts.ShellDir))
	cfgFile.WriteString("\n")
}

func appExists(checker utils.AppChecker, checkCmd []string, checkFlatpaks []string) bool {
	// Both nil is treated as "skip check" / unconditionally run
	if checkCmd == nil && checkFlatpaks == nil {
		return true
	}
	if checkCmd != nil && checker.AnyCommandExists(checkCmd...) {
		return true
	}
	if checkFlatpaks != nil && checker.AnyFlatpakExists(checkFlatpaks...) {
		return true
	}
	return false
}

func appendVSCodeConfig(cfgFile *os.File, name, extBaseDir, shellDir string) {
	pattern := filepath.Join(extBaseDir, "danklinux.dms-theme-*")
	matches, err := filepath.Glob(pattern)
	if err != nil || len(matches) == 0 {
		return
	}

	extDir := matches[0]
	templateDir := filepath.Join(shellDir, "matugen", "templates")
	fmt.Fprintf(cfgFile, `[templates.dms%sdefault]
input_path = '%s/vscode-color-theme-default.json'
output_path = '%s/themes/dankshell-default.json'

[templates.dms%sdark]
input_path = '%s/vscode-color-theme-dark.json'
output_path = '%s/themes/dankshell-dark.json'

[templates.dms%slight]
input_path = '%s/vscode-color-theme-light.json'
output_path = '%s/themes/dankshell-light.json'

`, name, templateDir, extDir,
		name, templateDir, extDir,
		name, templateDir, extDir)
	log.Infof("Added %s theme config (extension found at %s)", name, extDir)
}

func substituteVars(content, shellDir string) string {
	result := strings.ReplaceAll(content, "'SHELL_DIR/", "'"+shellDir+"/")
	result = strings.ReplaceAll(result, "'CONFIG_DIR/", "'"+utils.XDGConfigHome()+"/")
	result = strings.ReplaceAll(result, "'DATA_DIR/", "'"+utils.XDGDataHome()+"/")
	result = strings.ReplaceAll(result, "'CACHE_DIR/", "'"+utils.XDGCacheHome()+"/")
	if emacsDir := utils.EmacsConfigDir(); emacsDir != "" {
		result = strings.ReplaceAll(result, "'EMACS_DIR/", "'"+emacsDir+"/")
	}
	return result
}

func extractTOMLSection(content, startMarker, endMarker string) string {
	startIdx := strings.Index(content, startMarker)
	if startIdx == -1 {
		return ""
	}

	if endMarker == "" {
		return content[startIdx:]
	}

	endIdx := strings.Index(content[startIdx:], endMarker)
	if endIdx == -1 {
		return content[startIdx:]
	}
	return content[startIdx : startIdx+endIdx]
}

type matugenFlags struct {
	supportsCOE bool
	isV4        bool
}

func detectMatugenVersion() (matugenFlags, error) {
	matugenVersionMu.Lock()
	defer matugenVersionMu.Unlock()

	if matugenVersionOK {
		return matugenFlags{matugenSupportsCOE, matugenIsV4}, nil
	}

	return detectMatugenVersionLocked()
}

func redetectMatugenVersion(old matugenFlags) (matugenFlags, bool) {
	matugenVersionMu.Lock()
	defer matugenVersionMu.Unlock()

	matugenVersionOK = false
	flags, err := detectMatugenVersionLocked()
	if err != nil {
		return old, false
	}
	changed := flags.supportsCOE != old.supportsCOE || flags.isV4 != old.isV4
	return flags, changed
}

func detectMatugenVersionLocked() (matugenFlags, error) {
	cmd := exec.Command("matugen", "--version")
	output, err := cmd.Output()
	if err != nil {
		return matugenFlags{}, fmt.Errorf("failed to get matugen version: %w", err)
	}

	versionStr := strings.TrimSpace(string(output))
	versionStr = strings.TrimPrefix(versionStr, "matugen ")

	parts := strings.Split(versionStr, ".")
	if len(parts) < 2 {
		return matugenFlags{}, fmt.Errorf("unexpected matugen version format: %q", versionStr)
	}

	major, err := strconv.Atoi(parts[0])
	if err != nil {
		return matugenFlags{}, fmt.Errorf("failed to parse matugen major version %q: %w", parts[0], err)
	}

	minor, err := strconv.Atoi(parts[1])
	if err != nil {
		return matugenFlags{}, fmt.Errorf("failed to parse matugen minor version %q: %w", parts[1], err)
	}

	matugenSupportsCOE = major > 3 || (major == 3 && minor >= 1)
	matugenIsV4 = major >= 4
	matugenVersionOK = true

	if matugenSupportsCOE {
		log.Debugf("Matugen %s detected: continue-on-error support enabled", versionStr)
	}
	if matugenIsV4 {
		log.Debugf("Matugen %s detected: using v4 compatibility flags", versionStr)
	}
	return matugenFlags{matugenSupportsCOE, matugenIsV4}, nil
}

func buildMatugenArgs(baseArgs []string, flags matugenFlags) []string {
	args := make([]string, 0, len(baseArgs)+4)
	if flags.supportsCOE {
		args = append(args, "--continue-on-error")
	}
	args = append(args, baseArgs...)
	if flags.isV4 {
		args = append(args, "--source-color-index", "0")
	}
	return args
}

func runMatugen(baseArgs []string) error {
	flags, err := detectMatugenVersion()
	if err != nil {
		return err
	}

	args := buildMatugenArgs(baseArgs, flags)
	cmd := exec.Command("matugen", args...)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	runErr := cmd.Run()
	if runErr == nil {
		return nil
	}

	log.Warnf("Matugen failed (v4=%v): %v", flags.isV4, runErr)

	newFlags, changed := redetectMatugenVersion(flags)
	if !changed {
		return runErr
	}

	log.Warnf("Matugen version changed (v4: %v -> %v), retrying", flags.isV4, newFlags.isV4)
	args = buildMatugenArgs(baseArgs, newFlags)
	retryCmd := exec.Command("matugen", args...)
	retryCmd.Stdout = os.Stdout
	retryCmd.Stderr = os.Stderr
	return retryCmd.Run()
}

func runMatugenDryRun(opts *Options) (string, error) {
	flags, err := detectMatugenVersion()
	if err != nil {
		return "", err
	}

	output, dryErr := execDryRun(opts, flags)
	if dryErr == nil {
		return output, nil
	}

	log.Warnf("Matugen dry-run failed (v4=%v): %v", flags.isV4, dryErr)

	newFlags, changed := redetectMatugenVersion(flags)
	if !changed {
		return "", dryErr
	}

	log.Warnf("Matugen version changed (v4: %v -> %v), retrying dry-run", flags.isV4, newFlags.isV4)
	return execDryRun(opts, newFlags)
}

func execDryRun(opts *Options, flags matugenFlags) (string, error) {
	var baseArgs []string
	switch opts.Kind {
	case "hex":
		baseArgs = []string{"color", "hex", opts.Value}
	default:
		baseArgs = []string{opts.Kind, opts.Value}
	}
	baseArgs = append(baseArgs, "-m", "dark", "-t", opts.MatugenType, "--json", "hex", "--dry-run")
	baseArgs = appendContrastArg(baseArgs, opts.Contrast)
	if flags.isV4 {
		baseArgs = append(baseArgs, "--source-color-index", "0", "--old-json-output")
	}

	cmd := exec.Command("matugen", baseArgs...)
	var stderr strings.Builder
	cmd.Stderr = &stderr
	output, err := cmd.Output()
	if err != nil {
		if stderr.Len() > 0 {
			return "", fmt.Errorf("matugen %v failed (v4=%v): %s", baseArgs, flags.isV4, strings.TrimSpace(stderr.String()))
		}
		return "", fmt.Errorf("matugen %v failed (v4=%v): %w", baseArgs, flags.isV4, err)
	}
	return strings.ReplaceAll(string(output), "\n", ""), nil
}

func extractMatugenColor(jsonStr, colorName, variant string) string {
	var data map[string]any
	if err := json.Unmarshal([]byte(jsonStr), &data); err != nil {
		return ""
	}

	colors, ok := data["colors"].(map[string]any)
	if !ok {
		return ""
	}

	colorData, ok := colors[colorName].(map[string]any)
	if !ok {
		return ""
	}

	variantData, ok := colorData[variant].(string)
	if !ok {
		return ""
	}

	return variantData
}

func extractNestedColor(jsonStr, colorName, variant string) string {
	var data map[string]any
	if err := json.Unmarshal([]byte(jsonStr), &data); err != nil {
		return ""
	}

	colorData, ok := data[colorName].(map[string]any)
	if !ok {
		return ""
	}

	variantData, ok := colorData[variant].(map[string]any)
	if !ok {
		return ""
	}

	color, ok := variantData["color"].(string)
	if !ok {
		return ""
	}

	return color
}

func generateDank16Variants(primaryDark, primaryLight, surface string, mode ColorMode) string {
	variantOpts := dank16.VariantOptions{
		PrimaryDark:  primaryDark,
		PrimaryLight: primaryLight,
		Background:   surface,
		UseDPS:       true,
		IsLightMode:  mode == ColorModeLight,
	}
	variantColors := dank16.GenerateVariantPalette(variantOpts)
	return dank16.GenerateVariantJSON(variantColors)
}

func isDMSGTKActive(configDir string) bool {
	gtkCSS := filepath.Join(configDir, "gtk-3.0", "gtk.css")

	info, err := os.Lstat(gtkCSS)
	if err != nil {
		return false
	}

	if info.Mode()&os.ModeSymlink != 0 {
		target, err := os.Readlink(gtkCSS)
		return err == nil && strings.Contains(target, "dank-colors.css")
	}

	data, err := os.ReadFile(gtkCSS)
	return err == nil && strings.Contains(string(data), "dank-colors.css")
}

func refreshGTK(mode ColorMode) {
	if err := utils.GsettingsSet("org.gnome.desktop.interface", "gtk-theme", ""); err != nil {
		log.Warnf("Failed to reset gtk-theme: %v", err)
	}
	if err := utils.GsettingsSet("org.gnome.desktop.interface", "gtk-theme", mode.GTKTheme()); err != nil {
		log.Warnf("Failed to set gtk-theme: %v", err)
	}
}

func refreshGTK4() {
	output, err := utils.GsettingsGet("org.gnome.desktop.interface", "color-scheme")
	if err != nil {
		return
	}
	current := strings.Trim(output, "'")

	var toggle string
	if current == "prefer-dark" {
		toggle = "default"
	} else {
		toggle = "prefer-dark"
	}

	if err := utils.GsettingsSet("org.gnome.desktop.interface", "color-scheme", toggle); err != nil {
		log.Warnf("Failed to toggle color-scheme for GTK4 refresh: %v", err)
		return
	}
	time.Sleep(50 * time.Millisecond)
	if err := utils.GsettingsSet("org.gnome.desktop.interface", "color-scheme", current); err != nil {
		log.Warnf("Failed to restore color-scheme for GTK4 refresh: %v", err)
	}
}

func refreshQt6ct() {
	confPath := filepath.Join(utils.XDGConfigHome(), "qt6ct", "qt6ct.conf")
	now := time.Now()
	if err := os.Chtimes(confPath, now, now); err != nil {
		log.Warnf("Failed to touch qt6ct.conf: %v", err)
	}
}

func signalTerminals(opts *Options) {
	if !opts.ShouldSkipTemplate("kitty") && appExists(opts.AppChecker, []string{"kitty"}, nil) {
		signalByName("kitty", syscall.SIGUSR1)
		signalByName(".kitty-wrapped", syscall.SIGUSR1)
	}
	if !opts.ShouldSkipTemplate("ghostty") && appExists(opts.AppChecker, []string{"ghostty"}, nil) {
		signalByName("ghostty", syscall.SIGUSR2)
		signalByName(".ghostty-wrappe", syscall.SIGUSR2)
	}
}

func signalByName(name string, sig syscall.Signal) {
	entries, err := os.ReadDir("/proc")
	if err != nil {
		return
	}
	for _, entry := range entries {
		pid, err := strconv.Atoi(entry.Name())
		if err != nil {
			continue
		}
		comm, err := os.ReadFile(filepath.Join("/proc", entry.Name(), "comm"))
		if err != nil {
			continue
		}
		if strings.TrimSpace(string(comm)) == name {
			syscall.Kill(pid, sig)
		}
	}
}

func syncColorScheme(mode ColorMode) {
	scheme := "prefer-dark"
	if mode == ColorModeLight {
		scheme = "default"
	}

	if err := utils.GsettingsSet("org.gnome.desktop.interface", "color-scheme", scheme); err != nil {
		log.Warnf("Failed to sync color-scheme: %v", err)
	}
}

var adwaitaAccents = []struct {
	name   string
	colors []colorful.Color
}{
	{"blue", hexColors("#3f8ae5", "#438de6", "#a4caee")},
	{"green", hexColors("#26a269", "#39ac76", "#81d5ad")},
	{"orange", hexColors("#f17738", "#ff7800", "#ffc994")},
	{"pink", hexColors("#e4358a", "#e64392", "#f9b3d5")},
	{"purple", hexColors("#954ab5", "#9c46b9", "#d099d6")},
	{"red", hexColors("#e84053", "#e01b24", "#f2a1a5")},
	{"slate", hexColors("#557b9f", "#6a8daf", "#b4c6d6")},
	{"teal", hexColors("#129eb0", "#2190a4", "#7bdff4")},
	{"yellow", hexColors("#cbac10", "#d4b411", "#f5c211")},
}

func hexColors(hexes ...string) []colorful.Color {
	out := make([]colorful.Color, len(hexes))
	for i, h := range hexes {
		out[i], _ = colorful.Hex(h)
	}
	return out
}

func closestAdwaitaAccent(primaryHex string) string {
	c, err := colorful.Hex(primaryHex)
	if err != nil {
		return "blue"
	}

	best := "blue"
	bestDist := math.MaxFloat64
	for _, a := range adwaitaAccents {
		for _, ref := range a.colors {
			d := c.DistanceCIEDE2000(ref)
			if d < bestDist {
				bestDist = d
				best = a.name
			}
		}
	}
	return best
}

func syncAccentColor(primaryHex string) {
	accent := closestAdwaitaAccent(primaryHex)
	log.Infof("Setting GNOME accent color: %s", accent)
	if err := utils.GsettingsSet("org.gnome.desktop.interface", "accent-color", accent); err != nil {
		log.Warnf("Failed to set accent-color: %v", err)
	}
}

type TemplateCheck struct {
	ID       string `json:"id"`
	Detected bool   `json:"detected"`
}

func CheckTemplates(checker utils.AppChecker) []TemplateCheck {
	if checker == nil {
		checker = utils.DefaultAppChecker{}
	}

	homeDir, _ := os.UserHomeDir()
	checks := make([]TemplateCheck, 0, len(templateRegistry))

	for _, tmpl := range templateRegistry {
		detected := false

		switch {
		case tmpl.RunUnconditionally:
			detected = true
		case tmpl.Kind == TemplateKindVSCode:
			detected = checkVSCodeExtension(homeDir)
		case tmpl.Kind == TemplateKindEmacs:
			detected = appExists(checker, tmpl.Commands, tmpl.Flatpaks) && utils.EmacsConfigDir() != ""
		default:
			detected = appExists(checker, tmpl.Commands, tmpl.Flatpaks)
		}

		checks = append(checks, TemplateCheck{ID: tmpl.ID, Detected: detected})
	}

	return checks
}

func checkVSCodeExtension(homeDir string) bool {
	extDirs := []string{
		filepath.Join(homeDir, ".vscode/extensions"),
		filepath.Join(homeDir, ".vscode-oss/extensions"),
		filepath.Join(homeDir, ".config/Code - OSS/extensions"),
		filepath.Join(homeDir, ".cursor/extensions"),
		filepath.Join(homeDir, ".windsurf/extensions"),
	}

	for _, extDir := range extDirs {
		pattern := filepath.Join(extDir, "danklinux.dms-theme-*")
		if matches, err := filepath.Glob(pattern); err == nil && len(matches) > 0 {
			return true
		}
	}
	return false
}