package shared

import (
	"strconv"
	"strings"
)

// ButtonConfig represents a unified button configuration
type ButtonConfig struct {
	// Content
	Text string
	URL  string

	// Type determines theme defaults
	// Built-in: "primary" | "secondary" | "outline" | "ghost" | "link" | "destructive"
	// Custom: any user-defined type name from theme.buttons.custom
	Type string

	// Override Mode
	UseThemeDefaults bool // When true, uses CSS variables from theme

	// Custom Overrides (only used when UseThemeDefaults = false)
	TextColor   string // Tailwind class like "text-white" or "text-[#ff5500]"
	TextOpacity int    // 0-100
	BgColor     string // Tailwind class like "bg-primary" or "bg-[#ff5500]"
	BgOpacity   int    // 0-100

	// Effects (can override theme)
	Pill     bool   // Fully rounded corners
	Elevated bool   // Shadow
	ThreeDee bool   // 3D push effect
	Size     string // "sm" | "md" | "lg"

	// Behavior
	OpenNewTab bool
}

// Classes returns CSS classes for the button
func (b ButtonConfig) Classes() string {
	var classes []string
	classes = append(classes, "btn")

	// Size class
	switch b.Size {
	case "sm":
		classes = append(classes, "btn-sm")
	case "lg":
		classes = append(classes, "btn-lg")
	default:
		classes = append(classes, "btn-md")
	}

	if b.UseThemeDefaults {
		// Use theme CSS variable classes
		btnType := b.Type
		if btnType == "" {
			btnType = "primary"
		}
		classes = append(classes, "btn-"+btnType)
	} else {
		// Use custom Tailwind classes
		if b.BgColor != "" {
			classes = append(classes, b.BgColor)
		} else {
			// Default based on type variant
			switch b.Type {
			case "outline":
				classes = append(classes, "border-2", "border-primary", "bg-transparent")
			case "ghost":
				classes = append(classes, "bg-transparent", "hover:bg-accent")
			case "link":
				classes = append(classes, "bg-transparent", "underline", "underline-offset-4")
			case "destructive":
				classes = append(classes, "bg-destructive", "hover:bg-destructive/90")
			default: // primary, secondary, solid
				classes = append(classes, "bg-primary", "hover:bg-primary/90")
			}
		}

		if b.TextColor != "" {
			classes = append(classes, b.TextColor)
		} else {
			switch b.Type {
			case "outline":
				classes = append(classes, "text-primary")
			case "ghost":
				classes = append(classes, "text-foreground", "hover:text-accent-foreground")
			case "link":
				classes = append(classes, "text-primary")
			case "destructive":
				classes = append(classes, "text-destructive-foreground")
			default:
				classes = append(classes, "text-primary-foreground")
			}
		}
	}

	// Effects that can override theme
	if b.Pill {
		classes = append(classes, "rounded-full")
	}

	if b.Elevated && b.Type != "ghost" && b.Type != "link" {
		classes = append(classes, "shadow-lg", "hover:shadow-xl")
	}

	if b.ThreeDee && (b.Type == "" || b.Type == "primary" || b.Type == "solid") {
		classes = append(classes, "border-b-4", "border-primary/70", "active:border-b-2", "active:mt-0.5")
	}

	return strings.Join(classes, " ")
}

// InlineStyle returns inline CSS styles for opacity if needed
func (b ButtonConfig) InlineStyle() string {
	var styles []string

	if !b.UseThemeDefaults {
		if b.TextOpacity > 0 && b.TextOpacity < 100 {
			opacity := float64(b.TextOpacity) / 100.0
			styles = append(styles, "color-opacity: "+strconv.FormatFloat(opacity, 'f', 2, 64))
		}
		if b.BgOpacity > 0 && b.BgOpacity < 100 {
			opacity := float64(b.BgOpacity) / 100.0
			styles = append(styles, "--tw-bg-opacity: "+strconv.FormatFloat(opacity, 'f', 2, 64))
		}
	}

	if len(styles) == 0 {
		return ""
	}
	return strings.Join(styles, "; ")
}

// ParseButton extracts ButtonConfig from JSON content
func ParseButton(value any, defaultType string) ButtonConfig {
	btn := ButtonConfig{
		Type:             defaultType,
		UseThemeDefaults: true, // Default to theme styling
		TextOpacity:      100,
		BgOpacity:        100,
		Size:             "md",
	}

	if value == nil {
		return btn
	}

	obj, ok := value.(map[string]any)
	if !ok {
		return btn
	}

	// Content
	if text, ok := obj["text"].(string); ok {
		btn.Text = text
	}
	if url, ok := obj["url"].(string); ok {
		btn.URL = url
	}

	// Type - check explicit type field first
	typeExplicitlySet := false
	if t, ok := obj["type"].(string); ok && t != "" {
		btn.Type = t
		typeExplicitlySet = true
	}

	// Use theme defaults toggle - explicit setting takes precedence
	if useTheme, ok := obj["useThemeDefaults"].(bool); ok {
		btn.UseThemeDefaults = useTheme
	} else {
		// Legacy: if useThemeDefaults not set but custom colors exist, assume not using theme defaults
		if textColor, ok := obj["textColor"].(string); ok && textColor != "" {
			btn.UseThemeDefaults = false
		} else if bgColor, ok := obj["bgColor"].(string); ok && bgColor != "" {
			btn.UseThemeDefaults = false
		}
	}

	// Custom overrides
	if textColor, ok := obj["textColor"].(string); ok {
		btn.TextColor = textColor
	}
	if textOpacity, ok := obj["textOpacity"].(float64); ok {
		btn.TextOpacity = int(textOpacity)
	}
	if bgColor, ok := obj["bgColor"].(string); ok {
		btn.BgColor = bgColor
	}
	if bgOpacity, ok := obj["bgOpacity"].(float64); ok {
		btn.BgOpacity = int(bgOpacity)
	}

	// Effects
	if pill, ok := obj["pill"].(bool); ok {
		btn.Pill = pill
	}
	if elevated, ok := obj["elevated"].(bool); ok {
		btn.Elevated = elevated
	}
	if threeDee, ok := obj["threeDee"].(bool); ok {
		btn.ThreeDee = threeDee
	}
	if size, ok := obj["size"].(string); ok && size != "" {
		btn.Size = size
	}

	// Behavior
	if openNewTab, ok := obj["openNewTab"].(bool); ok {
		btn.OpenNewTab = openNewTab
	}

	// Legacy support: "style" field from old format
	if style, ok := obj["style"].(string); ok && style != "" && btn.Type == defaultType {
		// Map legacy styles to types
		switch style {
		case "secondary":
			btn.Type = "secondary"
		case "outline":
			btn.Type = "outline"
		case "ghost":
			btn.Type = "ghost"
		case "link":
			btn.Type = "link"
		case "destructive":
			btn.Type = "destructive"
		default:
			btn.Type = "primary"
		}
	}

	// Legacy: "variant" field - only use if type wasn't explicitly set
	if !typeExplicitlySet {
		if variant, ok := obj["variant"].(string); ok && variant != "" {
			if variant == "solid" {
				btn.Type = "primary"
			} else {
				btn.Type = variant
			}
		}
	}

	return btn
}

// HasContent returns true if the button has text and URL
func (b ButtonConfig) HasContent() bool {
	return b.Text != "" && b.URL != ""
}