package theme

import "strings"

// GoogleFont represents a curated Google Font
type GoogleFont struct {
	Family   string   `json:"family"`
	Category string   `json:"category"`
	Variants []string `json:"variants"`
}

// CuratedGoogleFonts returns the list of popular Google Fonts
// These are embedded in the binary - no API key needed
func CuratedGoogleFonts() []GoogleFont {
	return []GoogleFont{
		// Sans-serif
		{Family: "Inter", Category: "sans-serif", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Roboto", Category: "sans-serif", Variants: []string{"400", "500", "700", "400i", "700i"}},
		{Family: "Open Sans", Category: "sans-serif", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Lato", Category: "sans-serif", Variants: []string{"400", "700", "400i", "700i"}},
		{Family: "Montserrat", Category: "sans-serif", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Poppins", Category: "sans-serif", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Source Sans 3", Category: "sans-serif", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Nunito", Category: "sans-serif", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Raleway", Category: "sans-serif", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Work Sans", Category: "sans-serif", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "DM Sans", Category: "sans-serif", Variants: []string{"400", "500", "700", "400i", "700i"}},
		{Family: "Manrope", Category: "sans-serif", Variants: []string{"400", "500", "600", "700"}},
		{Family: "Plus Jakarta Sans", Category: "sans-serif", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Outfit", Category: "sans-serif", Variants: []string{"400", "500", "600", "700"}},
		{Family: "Lexend", Category: "sans-serif", Variants: []string{"400", "500", "600", "700"}},
		{Family: "Figtree", Category: "sans-serif", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Geist", Category: "sans-serif", Variants: []string{"400", "500", "600", "700"}},

		// Serif
		{Family: "Playfair Display", Category: "serif", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Merriweather", Category: "serif", Variants: []string{"400", "700", "400i", "700i"}},
		{Family: "Lora", Category: "serif", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "PT Serif", Category: "serif", Variants: []string{"400", "700", "400i", "700i"}},
		{Family: "Source Serif 4", Category: "serif", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Libre Baskerville", Category: "serif", Variants: []string{"400", "700", "400i"}},
		{Family: "Crimson Text", Category: "serif", Variants: []string{"400", "600", "700", "400i", "600i", "700i"}},
		{Family: "EB Garamond", Category: "serif", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Bitter", Category: "serif", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Cormorant", Category: "serif", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},

		// Monospace
		{Family: "JetBrains Mono", Category: "monospace", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Fira Code", Category: "monospace", Variants: []string{"400", "500", "600", "700"}},
		{Family: "Source Code Pro", Category: "monospace", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "IBM Plex Mono", Category: "monospace", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Roboto Mono", Category: "monospace", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Space Mono", Category: "monospace", Variants: []string{"400", "700", "400i", "700i"}},
		{Family: "Inconsolata", Category: "monospace", Variants: []string{"400", "500", "600", "700"}},

		// Display
		{Family: "Oswald", Category: "display", Variants: []string{"400", "500", "600", "700"}},
		{Family: "Bebas Neue", Category: "display", Variants: []string{"400"}},
		{Family: "Anton", Category: "display", Variants: []string{"400"}},
		{Family: "Archivo Black", Category: "display", Variants: []string{"400"}},
		{Family: "Righteous", Category: "display", Variants: []string{"400"}},
		{Family: "Rubik", Category: "display", Variants: []string{"400", "500", "600", "700", "400i", "700i"}},
		{Family: "Space Grotesk", Category: "display", Variants: []string{"400", "500", "600", "700"}},
		{Family: "Sora", Category: "display", Variants: []string{"400", "500", "600", "700"}},

		// Handwriting
		{Family: "Dancing Script", Category: "handwriting", Variants: []string{"400", "500", "600", "700"}},
		{Family: "Pacifico", Category: "handwriting", Variants: []string{"400"}},
		{Family: "Caveat", Category: "handwriting", Variants: []string{"400", "500", "600", "700"}},
		{Family: "Satisfy", Category: "handwriting", Variants: []string{"400"}},
	}
}

// BuildGoogleFontURL generates a Google Fonts CSS URL
func BuildGoogleFontURL(family string, variants []string) string {
	// Format: https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap
	// For italic: family=Inter:ital,wght@0,400;0,700;1,400;1,700

	hasItalic := false
	weights := []string{}

	for _, v := range variants {
		if len(v) > 0 && v[len(v)-1] == 'i' {
			hasItalic = true
			weights = append(weights, v[:len(v)-1])
		} else {
			weights = append(weights, v)
		}
	}

	// Deduplicate weights
	seen := make(map[string]bool)
	uniqueWeights := []string{}
	for _, w := range weights {
		if !seen[w] {
			seen[w] = true
			uniqueWeights = append(uniqueWeights, w)
		}
	}

	familyEncoded := family
	// Replace spaces with +
	for i := 0; i < len(familyEncoded); i++ {
		if familyEncoded[i] == ' ' {
			familyEncoded = familyEncoded[:i] + "+" + familyEncoded[i+1:]
		}
	}

	if hasItalic {
		// Use ital,wght axis
		var specs []string
		for _, w := range uniqueWeights {
			specs = append(specs, "0,"+w) // normal
		}
		for _, w := range uniqueWeights {
			specs = append(specs, "1,"+w) // italic
		}
		return "https://fonts.googleapis.com/css2?family=" + familyEncoded + ":ital,wght@" + joinStrings(specs, ";") + "&display=swap"
	}

	return "https://fonts.googleapis.com/css2?family=" + familyEncoded + ":wght@" + joinStrings(uniqueWeights, ";") + "&display=swap"
}

func joinStrings(strs []string, sep string) string {
	if len(strs) == 0 {
		return ""
	}
	var result strings.Builder
	result.WriteString(strs[0])
	for i := 1; i < len(strs); i++ {
		result.WriteString(sep + strs[i])
	}
	return result.String()
}