package config

import (
	"os"
	"path/filepath"

	"github.com/bnema/dumber/internal/domain/entity"
)

// Default configuration constants
const (
	// History defaults
	defaultMaxHistoryEntries = 10000 // entries
	defaultRetentionDays     = 365   // 1 year

	// Dmenu defaults
	defaultMaxHistoryDays = 30 // days

	// Logging defaults
	defaultMaxLogAgeDays = 7   // days
	defaultMaxLogFiles   = 100 // session log files

	// Appearance defaults
	defaultSidebarWidth                  = 320 // px, clamped to [280, 380]
	defaultFontSize                      = 16  // points
	defaultExternalThemeProvider         = "noctalia"
	defaultExternalThemeFormat           = "colors-json"
	defaultExternalThemeColorsFilename   = "colors.json"
	defaultExternalThemeTemplateFormat   = "dumber-json"
	defaultExternalThemeTemplateFilename = "noctalia-theme.json"

	// Workspace defaults
	defaultNewPaneURL = "about:blank"

	// Omnibox defaults
	defaultOmniboxStyle             = "command"
	defaultOmniboxInitialBehavior   = OmniboxInitialBehaviorRecent
	defaultOmniboxMaxHistoryDays    = 30
	defaultOmniboxAutoOpenOnNewPane = false

	// Workspace defaults
	defaultPaneActivationShortcut          = "ctrl+p"
	defaultPaneTimeoutMilliseconds         = 3000
	defaultTabActivationShortcut           = "ctrl+t"
	defaultTabTimeoutMilliseconds          = 3000
	defaultResizeActivationShortcut        = "ctrl+n"
	defaultResizeTimeoutMilliseconds       = 3000
	defaultPageActivationShortcut          = "ctrl+y"
	defaultPageTimeoutMilliseconds         = 0
	defaultPageSequenceTimeoutMilliseconds = 500
	defaultResizeStepPercent               = 5.0
	defaultResizeMinPanePercent            = 10.0
	defaultTabBarPosition                  = "bottom"
	defaultPopupPlacement                  = "right"
	defaultExternalLinkBehavior            = ExternalLinkBehaviorWindowed
	defaultExternalLinkPlacement           = ExternalLinkPlacementRight
	defaultFloatingPaneWidthPct            = 0.82
	defaultFloatingPaneHeightPct           = 0.72

	// Session defaults
	defaultSessionActivationShortcut  = "ctrl+o"
	defaultSessionTimeoutMilliseconds = 3000
	defaultSnapshotIntervalMs         = 5000
	defaultMaxExitedSessions          = 50
	defaultMaxExitedSessionAgeDays    = 7

	// Workspace styling defaults
	// Active pane border (overlay)
	defaultBorderWidth = 1
	defaultBorderColor = "@theme_selected_bg_color"

	// Mode border width (consolidated for all modes)
	defaultModeBorderWidth = 4

	// Mode colors (used for both borders and toaster)
	defaultPaneModeColor    = "#4A90E2" // Blue for pane mode
	defaultTabModeColor     = "#FFA500" // Orange for tab mode
	defaultSessionModeColor = "#9B59B6" // Purple for session mode
	defaultVimModeColor     = "#F7768E"
	defaultResizeModeColor  = "#00D4AA" // Cyan/teal for resize mode

	// Mode indicator toaster
	defaultModeIndicatorToasterEnabled = true

	// Other styling
	defaultTransitionDuration = 120
	defaultUIScale            = 1.0 // UI scale multiplier (1.0 = 100%, 1.2 = 120%)

	// Performance defaults
	defaultZoomCacheSize              = 256 // domains to cache (~20KB memory)
	defaultWebViewPoolPrewarmCount    = 4   // WebViews to pre-create at startup
	defaultCEFWindowlessFrameRate     = 60  // static OSR frame rate when adaptive CEF pacing is disabled
	defaultCEFWindowlessFrameRateMax  = 240 // adaptive OSR frame-rate hard cap
	defaultCEFScrollMultiplier        = 1.0
	defaultCEFScrollPreciseMultiplier = 2.5
	defaultCEFScrollMaxDelta          = 0
	defaultCEFScrollTouchpadInertia   = true
	defaultCEFScrollWheelSmoothing    = true
	defaultCEFTouchpadNavigation      = true
	// Require a deliberate swipe before history navigation so ordinary
	// horizontal scrolling is unlikely to cross the commit threshold.
	defaultCEFTouchpadNavigationDelta = 320.0
	defaultCEFTouchpadNavigationRatio = 0.5

	// Skia threading defaults (0 = unset, -1 = unset for GPU threads)
	defaultSkiaCPUPaintingThreads = 0
	defaultSkiaGPUPaintingThreads = -1 // -1 means unset; 0 would disable GPU tile painting
)

func defaultBrowsingContextConfig() BrowsingContextConfig {
	return BrowsingContextConfig{
		Behavior:             PopupBehaviorSplit,
		Placement:            defaultPopupPlacement,
		OpenInNewPane:        true,
		FollowPaneContext:    true,
		BlankTargetBehavior:  "stacked",
		EnableSmartDetection: true,
		OAuthAutoClose:       true,
	}
}

// getDefaultLogDir returns the default log directory, falls back to empty string on error
func getDefaultLogDir() string {
	logDir, err := GetLogDir()
	if err != nil {
		return ""
	}
	return logDir
}

// getDefaultExternalThemePath returns Noctalia's native colors.json path.
func getDefaultExternalThemePath() string {
	return getDefaultExternalThemePathForFormat(defaultExternalThemeFormat)
}

func getDefaultExternalThemePathForFormat(format string) string {
	switch format {
	case defaultExternalThemeTemplateFormat:
		return getDefaultExternalThemeTemplatePath()
	default:
		return getDefaultNoctaliaColorsPath()
	}
}

func getDefaultNoctaliaColorsPath() string {
	configHome, err := os.UserConfigDir()
	if err != nil {
		return ""
	}
	return filepath.Join(configHome, defaultExternalThemeProvider, defaultExternalThemeColorsFilename)
}

func getDefaultExternalThemeTemplatePath() string {
	configDir, err := GetConfigDir()
	if err != nil {
		return ""
	}
	return filepath.Join(configDir, defaultExternalThemeTemplateFilename)
}

// DefaultConfig returns the default configuration values for dumber.
func DefaultConfig() *Config {
	browsingContextDefaults := defaultBrowsingContextConfig()

	return &Config{
		Database: DatabaseConfig{
			// Path is set dynamically in config.Load()
		},
		History: HistoryConfig{
			MaxEntries:          defaultMaxHistoryEntries,
			RetentionPeriodDays: defaultRetentionDays, // 1 year
			CleanupIntervalDays: 1,                    // daily cleanup
		},
		SearchShortcuts:     GetDefaultSearchShortcuts(),
		DefaultSearchEngine: "https://duckduckgo.com/?q=%s",
		Dmenu: DmenuConfig{
			MaxHistoryDays:   defaultMaxHistoryDays,
			ShowVisitCount:   true,
			ShowLastVisited:  true,
			HistoryPrefix:    "🕒",
			ShortcutPrefix:   "🔍",
			URLPrefix:        "🌐",
			DateFormat:       "2006-01-02 15:04",
			SortByVisitCount: true,
		},
		Logging: LoggingConfig{
			Level:          "info",
			Format:         "text", // text or json
			MaxAge:         defaultMaxLogAgeDays,
			MaxFiles:       defaultMaxLogFiles,
			LogDir:         getDefaultLogDir(),
			EnableFileLog:  true,
			CaptureConsole: false, // Disabled by default
			CaptureGTKLogs: false, // Disabled by default
		},
		Appearance: AppearanceConfig{
			SansFont:        "Fira Sans",
			SerifFont:       "Fira Sans",
			MonospaceFont:   "Fira Code",
			GtkFont:         "Adwaita Sans",
			DefaultFontSize: defaultFontSize,
			LightPalette: ColorPalette{
				Background:     "#fafafa",
				Surface:        "#f4f4f5",
				SurfaceVariant: "#e4e4e7",
				Text:           "#18181b",
				Muted:          "#71717a",
				Accent:         "#22c55e", // Green-500 - vibrant primary
				Border:         "#d4d4d8",
			},
			DarkPalette: ColorPalette{
				Background:     "#0a0a0b",
				Surface:        "#18181b",
				SurfaceVariant: "#27272a",
				Text:           "#fafafa",
				Muted:          "#a1a1aa",
				Accent:         "#4ade80", // Green-400 - vibrant primary
				Border:         "#3f3f46",
			},
			ColorScheme: "default", // default follows system theme
			ExternalTheme: entity.ExternalThemeConfig{
				Enabled:  false,
				Provider: defaultExternalThemeProvider,
				Format:   defaultExternalThemeFormat,
				Path:     getDefaultExternalThemePath(),
			},
		},
		Debug: DebugConfig{
			EnableDevTools: true,
		},
		Engine: EngineConfig{
			Type:             EngineTypeCEF,
			Profile:          ProfileDefault,
			PoolPrewarmCount: defaultWebViewPoolPrewarmCount,
			ZoomCacheSize:    defaultZoomCacheSize,
			// With ITP enabled, WebKit ignores ACCEPT_NO_THIRD_PARTY — ITP handles
			// third-party cookie isolation more intelligently. Using Always + ITP
			// matches Epiphany's model and avoids a misleading setting.
			CookiePolicy: CookiePolicyAlways,
			CEF: CEFEngineConfig{
				RenderStack:                 CEFRenderStackVulkan,
				AdaptiveWindowlessFrameRate: true,
				WindowlessFrameRate:         0,
				WindowlessFrameRateMax:      defaultCEFWindowlessFrameRateMax,
				LogFile:                     "",
				EnableAudioHandler:          true,
				Input: CEFInputConfig{
					ScrollWheelMultiplier:              defaultCEFScrollMultiplier,
					ScrollPreciseMultiplier:            defaultCEFScrollPreciseMultiplier,
					ScrollHorizontalMultiplier:         defaultCEFScrollMultiplier,
					ScrollVerticalMultiplier:           defaultCEFScrollMultiplier,
					ScrollMaxDelta:                     defaultCEFScrollMaxDelta,
					ScrollTouchpadInertia:              defaultCEFScrollTouchpadInertia,
					ScrollWheelSmoothing:               defaultCEFScrollWheelSmoothing,
					TouchpadNavigationEnabled:          defaultCEFTouchpadNavigation,
					TouchpadNavigationMinDelta:         defaultCEFTouchpadNavigationDelta,
					TouchpadNavigationMaxVerticalRatio: defaultCEFTouchpadNavigationRatio,
				},
			},
			WebKit: WebKitEngineConfig{
				ITPEnabled:             true,
				SkiaCPUPaintingThreads: defaultSkiaCPUPaintingThreads,
				SkiaGPUPaintingThreads: defaultSkiaGPUPaintingThreads,
				GSKRenderer:            GSKRendererAuto,
				GLRenderingMode:        GLRenderingModeAuto,
			},
		},
		DefaultWebpageZoom: 1.2,                 // 120% default zoom for better readability
		DefaultUIScale:     defaultUIScale,      // 1.0 = 100%, 2.0 = 200%
		SidebarWidth:       defaultSidebarWidth, // 320px, clamped to [280, 380]
		Workspace: WorkspaceConfig{
			NewPaneURL:        defaultNewPaneURL,
			SwitchToTabOnMove: true,
			PaneMode: PaneModeConfig{
				ActivationShortcut:  defaultPaneActivationShortcut,
				TimeoutMilliseconds: defaultPaneTimeoutMilliseconds,
				Actions: map[string]ActionBinding{
					"split-right":           {Keys: []string{"arrowright", "r"}, Desc: "Split pane to the right"},
					"split-left":            {Keys: []string{"arrowleft", "l"}, Desc: "Split pane to the left"},
					"split-up":              {Keys: []string{"arrowup", "u"}, Desc: "Split pane upward"},
					"split-down":            {Keys: []string{"arrowdown", "d"}, Desc: "Split pane downward"},
					"stack-pane":            {Keys: []string{"s"}, Desc: "Stack pane with sibling"},
					"close-pane":            {Keys: []string{"x"}, Desc: "Close current pane"},
					"move-pane-to-tab":      {Keys: []string{"m"}, Desc: "Move pane to different tab"},
					"move-pane-to-next-tab": {Keys: []string{"M", "shift+m"}, Desc: "Move pane to next tab"},
					"eject-pane-to-window":  {Keys: []string{"w"}, Desc: "Eject active pane to a new window"},

					"consume-or-expel-left":  {Keys: []string{"["}, Desc: "Consume/expel pane left"},
					"consume-or-expel-right": {Keys: []string{"]"}, Desc: "Consume/expel pane right"},
					"consume-or-expel-up":    {Keys: []string{"{"}, Desc: "Consume/expel pane up"},
					"consume-or-expel-down":  {Keys: []string{"}"}, Desc: "Consume/expel pane down"},

					"focus-right": {Keys: []string{"shift+arrowright", "shift+l"}, Desc: "Focus pane to the right"},
					"focus-left":  {Keys: []string{"shift+arrowleft", "shift+h"}, Desc: "Focus pane to the left"},
					"focus-up":    {Keys: []string{"shift+arrowup", "shift+k"}, Desc: "Focus pane above"},
					"focus-down":  {Keys: []string{"shift+arrowdown", "shift+j"}, Desc: "Focus pane below"},
					"confirm":     {Keys: []string{"enter"}, Desc: "Confirm action"},
					"cancel":      {Keys: []string{"escape"}, Desc: "Cancel/exit mode"},
				},
			},
			TabMode: TabModeConfig{
				ActivationShortcut:  defaultTabActivationShortcut,
				TimeoutMilliseconds: defaultTabTimeoutMilliseconds,
				Actions: map[string]ActionBinding{
					"new-tab":      {Keys: []string{"n", "c"}, Desc: "Create new tab"},
					"close-tab":    {Keys: []string{"x"}, Desc: "Close current tab"},
					"next-tab":     {Keys: []string{"l", "tab"}, Desc: "Switch to next tab"},
					"previous-tab": {Keys: []string{"h", "shift+tab"}, Desc: "Switch to previous tab"},
					"rename-tab":   {Keys: []string{"r"}, Desc: "Rename current tab"},
					"confirm":      {Keys: []string{"enter"}, Desc: "Confirm action"},
					"cancel":       {Keys: []string{"escape"}, Desc: "Cancel/exit mode"},
				},
			},
			VimMode: VimModeConfig{
				ActivationShortcut:          defaultPageActivationShortcut,
				TimeoutMilliseconds:         defaultPageTimeoutMilliseconds,
				SequenceTimeoutMilliseconds: defaultPageSequenceTimeoutMilliseconds,
				Actions: map[string]ActionBinding{
					"vim-scroll-left":      {Keys: []string{"h"}, Desc: "Scroll page left"},
					"vim-scroll-down":      {Keys: []string{"j"}, Desc: "Scroll page down"},
					"vim-scroll-up":        {Keys: []string{"k"}, Desc: "Scroll page up"},
					"vim-scroll-right":     {Keys: []string{"l"}, Desc: "Scroll page right"},
					"vim-scroll-down-fast": {Keys: []string{"shift+j"}, Desc: "Scroll page down fast"},
					"vim-scroll-up-fast":   {Keys: []string{"shift+k"}, Desc: "Scroll page up fast"},
					"confirm":              {Keys: []string{"enter"}, Desc: "Open selected heading link and exit mode"},
					"cancel":               {Keys: []string{"escape"}, Desc: "Cancel/exit mode"},
					"heading-next":         {Keys: []string{"]]"}, Desc: "Jump to next heading"},
					"heading-prev":         {Keys: []string{"[["}, Desc: "Jump to previous heading"},
					"focus-input":          {Keys: []string{"gi"}, Desc: "Focus next page input"},
					"code-next":            {Keys: []string{"]c"}, Desc: "Jump to next code block"},
					"code-prev":            {Keys: []string{"[c"}, Desc: "Jump to previous code block"},
					"table-next":           {Keys: []string{"]t"}, Desc: "Jump to next table"},
					"image-next":           {Keys: []string{"]i"}, Desc: "Jump to next image"},
					"list-next":            {Keys: []string{"]l"}, Desc: "Jump to next list"},
					"outline":              {Keys: []string{"gO"}, Desc: "Show page outline"},
					"yank-section":         {Keys: []string{"yah"}, Desc: "Yank current section"},
					"half-page-down":       {Keys: []string{"<C-d>"}, Desc: "Scroll half page down"},
					"half-page-up":         {Keys: []string{"<C-u>"}, Desc: "Scroll half page up"},
				},
			},
			ResizeMode: ResizeModeConfig{
				ActivationShortcut:  defaultResizeActivationShortcut,
				TimeoutMilliseconds: defaultResizeTimeoutMilliseconds,
				StepPercent:         defaultResizeStepPercent,
				MinPanePercent:      defaultResizeMinPanePercent,
				Actions: map[string]ActionBinding{
					"resize-increase-left":  {Keys: []string{"h", "arrowleft"}, Desc: "Increase size leftward"},
					"resize-increase-down":  {Keys: []string{"j", "arrowdown"}, Desc: "Increase size downward"},
					"resize-increase-up":    {Keys: []string{"k", "arrowup"}, Desc: "Increase size upward"},
					"resize-increase-right": {Keys: []string{"l", "arrowright"}, Desc: "Increase size rightward"},
					"resize-decrease-left":  {Keys: []string{"H"}, Desc: "Decrease size leftward"},
					"resize-decrease-down":  {Keys: []string{"J"}, Desc: "Decrease size downward"},
					"resize-decrease-up":    {Keys: []string{"K"}, Desc: "Decrease size upward"},
					"resize-decrease-right": {Keys: []string{"L"}, Desc: "Decrease size rightward"},
					"resize-increase":       {Keys: []string{"+", "="}, Desc: "Increase pane size"},
					"resize-decrease":       {Keys: []string{"-"}, Desc: "Decrease pane size"},
					"confirm":               {Keys: []string{"enter"}, Desc: "Confirm action"},
					"cancel":                {Keys: []string{"escape"}, Desc: "Cancel/exit mode"},
				},
			},
			Shortcuts: GlobalShortcutsConfig{
				Actions: map[string]ActionBinding{
					"toggle-floating-pane":         {Keys: []string{"alt+f"}, Desc: "Toggle floating pane"},
					"toggle-history-systemview":    {Keys: []string{"ctrl+h"}, Desc: "Toggle History in right split"},
					"toggle-favorites-sidebar":     {Keys: []string{"ctrl+b"}, Desc: "Toggle Favorites sidebar"},
					"toggle-current-page-favorite": {Keys: []string{"ctrl+d"}, Desc: "Add/remove current page favorite"},
					"toggle-config-systemview":     {Keys: []string{}, Desc: "Toggle Config in right split"},
					"close-pane":                   {Keys: []string{"ctrl+w"}, Desc: "Close active pane"},
					"next-tab":                     {Keys: []string{"ctrl+tab"}, Desc: "Switch to next tab"},
					"previous-tab":                 {Keys: []string{"ctrl+shift+tab"}, Desc: "Switch to previous tab"},
					"consume-or-expel-left":        {Keys: []string{"alt+["}, Desc: "Consume/expel pane left"},
					"consume-or-expel-right":       {Keys: []string{"alt+]"}, Desc: "Consume/expel pane right"},
					"consume-or-expel-up":          {Keys: []string{"alt+{"}, Desc: "Consume/expel pane up"},
					"consume-or-expel-down":        {Keys: []string{"alt+}"}, Desc: "Consume/expel pane down"},
				},
			},
			FloatingPane: FloatingPaneConfig{
				WidthPct:  defaultFloatingPaneWidthPct,
				HeightPct: defaultFloatingPaneHeightPct,
				Profiles:  map[string]FloatingPaneProfile{},
			},
			ExternalLinks: ExternalLinksConfig{
				Behavior:  defaultExternalLinkBehavior,
				Placement: defaultExternalLinkPlacement,
			},
			TabBarPosition:          defaultTabBarPosition,
			HideTabBarWhenSingleTab: true,
			BrowsingContexts:        browsingContextDefaults,
			Popups:                  browsingContextDefaults,
			Styling: WorkspaceStylingConfig{
				BorderWidth:                 defaultBorderWidth,
				BorderColor:                 defaultBorderColor,
				ModeBorderWidth:             defaultModeBorderWidth,
				PaneModeColor:               defaultPaneModeColor,
				TabModeColor:                defaultTabModeColor,
				SessionModeColor:            defaultSessionModeColor,
				ResizeModeColor:             defaultResizeModeColor,
				VimModeColor:                defaultVimModeColor,
				ModeLegendLinger:            true,
				ModeIndicatorToasterEnabled: defaultModeIndicatorToasterEnabled,
				ModeLegend:                  "delay",
				ModeLegendDelayMs:           500,
				ModeLegendAnimations:        true,
				TransitionDuration:          defaultTransitionDuration,
			},
		},
		ContentFiltering: ContentFilteringConfig{
			Enabled:    true, // Ad blocking enabled by default
			AutoUpdate: true, // Auto-update filters from GitHub releases
		},
		Clipboard: ClipboardConfig{
			AutoCopyOnSelection: true, // Enabled by default (zellij-style)
		},
		Omnibox: OmniboxConfig{
			Style:             defaultOmniboxStyle,
			InitialBehavior:   defaultOmniboxInitialBehavior,
			MaxHistoryDays:    defaultOmniboxMaxHistoryDays,
			AutoOpenOnNewPane: defaultOmniboxAutoOpenOnNewPane,
		},
		Session: SessionConfig{
			AutoRestore:             false,
			SnapshotIntervalMs:      defaultSnapshotIntervalMs,
			MaxExitedSessions:       defaultMaxExitedSessions,
			MaxExitedSessionAgeDays: defaultMaxExitedSessionAgeDays,
			SessionMode: SessionModeConfig{
				ActivationShortcut:  defaultSessionActivationShortcut,
				TimeoutMilliseconds: defaultSessionTimeoutMilliseconds,
				Actions: map[string]ActionBinding{
					"session-manager": {Keys: []string{"s", "w"}, Desc: "Open session manager"},
					"confirm":         {Keys: []string{"enter"}, Desc: "Confirm action"},
					"cancel":          {Keys: []string{"escape"}, Desc: "Cancel/exit mode"},
				},
			},
		},
		Media: MediaConfig{
			HardwareDecodingMode:     HardwareDecodingAuto, // auto allows sw fallback
			PreferAV1:                false,                // Don't force codec preference, let site choose
			ShowDiagnosticsOnStartup: false,                // Disabled - diagnostics can be noisy
			// GStreamer fields (ForceVSync, GLRenderingMode, GStreamerDebugLevel)
			// moved to [engine.webkit] — zero values here prevent them from being
			// written back when marshaling the Config struct.
		},
		Update: UpdateConfig{
			EnableOnStartup:     true,  // Check for updates on startup by default
			AutoDownload:        false, // Conservative: don't auto-download by default
			NotifyOnNewSettings: true,  // Show toast when new config settings available
		},
		Downloads: DownloadsConfig{
			Path: "", // Empty = use XDG_DOWNLOAD_DIR or ~/Downloads
		},
	}
}

// GetDefaultSearchShortcuts returns the default search shortcuts.
func GetDefaultSearchShortcuts() map[string]SearchShortcut {
	return map[string]SearchShortcut{
		"ddg": {
			URL:         "https://duckduckgo.com/?q=%s",
			Description: "DuckDuckGo search",
		},
		"g": {
			URL:         "https://www.google.com/search?q=%s",
			Description: "Google search",
		},
		"gi": {
			URL:         "https://www.google.com/search?tbm=isch&q=%s",
			Description: "Google Images search",
		},
		"gh": {
			URL:         "https://github.com/search?q=%s",
			Description: "GitHub search",
		},
		"go": {
			URL:         "https://pkg.go.dev/search?q=%s",
			Description: "Go package search",
		},
		"mdn": {
			URL:         "https://developer.mozilla.org/en-US/search?q=%s",
			Description: "MDN Web Docs search",
		},
		"npm": {
			URL:         "https://www.npmjs.com/search?q=%s",
			Description: "npm package search",
		},
		"r": {
			URL:         "https://www.reddit.com/search?q=%s",
			Description: "Reddit search",
		},
		"so": {
			URL:         "https://stackoverflow.com/search?q=%s",
			Description: "Stack Overflow search",
		},
		"w": {
			URL:         "https://en.wikipedia.org/wiki/%s",
			Description: "Wikipedia search",
		},
		"yt": {
			URL:         "https://www.youtube.com/results?search_query=%s",
			Description: "YouTube search",
		},
	}
}