// Copyright 2026 MarketAlly. All rights reserved.
// SPDX-License-Identifier: MIT

package pages

import (
	"crypto/sha256"
	"encoding/hex"
	"slices"

	"gopkg.in/yaml.v3"
)

// LandingConfig represents the parsed .gitea/landing.yaml configuration
type LandingConfig struct {
	Enabled       bool   `yaml:"enabled" json:"enabled"`
	PublicLanding bool   `yaml:"public_landing" json:"public_landing"`
	Template      string `yaml:"template" json:"template"` // open-source-hero, minimalist-docs, saas-conversion, bold-marketing

	// Custom domain (optional)
	Domain string `yaml:"domain,omitempty" json:"domain,omitempty"`

	// Brand configuration
	Brand BrandConfig `yaml:"brand,omitempty" json:"brand,omitzero"`

	// Hero section
	Hero HeroConfig `yaml:"hero,omitempty" json:"hero,omitzero"`

	// Stats/metrics
	Stats []StatConfig `yaml:"stats,omitempty" json:"stats,omitempty"`

	// Value propositions
	ValueProps []ValuePropConfig `yaml:"value_props,omitempty" json:"value_props,omitempty"`

	// Features
	Features []FeatureConfig `yaml:"features,omitempty" json:"features,omitempty"`

	// Social proof
	SocialProof SocialProofConfig `yaml:"social_proof,omitempty" json:"social_proof,omitzero"`

	// Pricing (for saas-conversion template)
	Pricing PricingConfig `yaml:"pricing,omitempty" json:"pricing,omitzero"`

	// CTA section
	CTASection CTASectionConfig `yaml:"cta_section,omitempty" json:"cta_section,omitzero"`

	// Blog section
	Blog BlogSectionConfig `yaml:"blog,omitempty" json:"blog,omitzero"`

	// Gallery section
	Gallery GallerySectionConfig `yaml:"gallery,omitempty" json:"gallery,omitzero"`

	// Comparison section
	Comparison ComparisonSectionConfig `yaml:"comparison,omitempty" json:"comparison,omitzero"`

	// Navigation visibility
	Navigation NavigationConfig `yaml:"navigation,omitempty" json:"navigation,omitzero"`

	// Footer
	Footer FooterConfig `yaml:"footer,omitempty" json:"footer,omitzero"`

	// Theme customization
	Theme ThemeConfig `yaml:"theme,omitempty" json:"theme,omitzero"`

	// SEO & Social
	SEO SEOConfig `yaml:"seo,omitempty" json:"seo,omitzero"`

	// Analytics
	Analytics AnalyticsConfig `yaml:"analytics,omitempty" json:"analytics,omitzero"`

	// Advanced settings
	Advanced AdvancedConfig `yaml:"advanced,omitempty" json:"advanced,omitzero"`

	// A/B testing experiments
	Experiments ExperimentConfig `yaml:"experiments,omitempty" json:"experiments,omitzero"`

	// Multi-language support
	I18n I18nConfig `yaml:"i18n,omitempty" json:"i18n,omitzero"`
}

// BrandConfig represents brand/identity settings
type BrandConfig struct {
	Name            string `yaml:"name,omitempty" json:"name,omitempty"`
	LogoURL         string `yaml:"logo_url,omitempty" json:"logo_url,omitempty"`
	UploadedLogo    string `yaml:"uploaded_logo,omitempty" json:"uploaded_logo,omitempty"`
	LogoSource      string `yaml:"logo_source,omitempty" json:"logo_source,omitempty"` // "url" (default), "repo", or "org" — selects avatar source
	Tagline         string `yaml:"tagline,omitempty" json:"tagline,omitempty"`
	FaviconURL      string `yaml:"favicon_url,omitempty" json:"favicon_url,omitempty"`
	UploadedFavicon string `yaml:"uploaded_favicon,omitempty" json:"uploaded_favicon,omitempty"`
}

// ResolvedLogoURL returns the uploaded logo path or the external URL.
func (b *BrandConfig) ResolvedLogoURL() string {
	if b.UploadedLogo != "" {
		return "/repo-avatars/" + b.UploadedLogo
	}
	return b.LogoURL
}

// ResolvedFaviconURL returns the uploaded favicon path or the external URL.
func (b *BrandConfig) ResolvedFaviconURL() string {
	if b.UploadedFavicon != "" {
		return "/repo-avatars/" + b.UploadedFavicon
	}
	return b.FaviconURL
}

// HeroConfig represents hero section settings
type HeroConfig struct {
	Headline      string    `yaml:"headline,omitempty" json:"headline,omitempty"`
	Subheadline   string    `yaml:"subheadline,omitempty" json:"subheadline,omitempty"`
	PrimaryCTA    CTAButton `yaml:"primary_cta,omitempty" json:"primary_cta,omitzero"`
	SecondaryCTA  CTAButton `yaml:"secondary_cta,omitempty" json:"secondary_cta,omitzero"`
	ImageURL      string    `yaml:"image_url,omitempty" json:"image_url,omitempty"`
	UploadedImage string    `yaml:"uploaded_image,omitempty" json:"uploaded_image,omitempty"` // filename in repo-avatars storage
	CodeExample   string    `yaml:"code_example,omitempty" json:"code_example,omitempty"`
	VideoURL      string    `yaml:"video_url,omitempty" json:"video_url,omitempty"`
}

// ResolvedImageURL returns the effective hero image URL, preferring uploaded image over URL.
func (h *HeroConfig) ResolvedImageURL() string {
	if h.UploadedImage != "" {
		return "/repo-avatars/" + h.UploadedImage
	}
	return h.ImageURL
}

// CTAButton represents a call-to-action button
type CTAButton struct {
	Label   string `yaml:"label,omitempty" json:"label,omitempty"`
	URL     string `yaml:"url,omitempty" json:"url,omitempty"`
	Variant string `yaml:"variant,omitempty" json:"variant,omitempty"` // primary, secondary, outline, text
}

// StatConfig represents a single stat/metric
type StatConfig struct {
	Value string `yaml:"value,omitempty" json:"value,omitempty"`
	Label string `yaml:"label,omitempty" json:"label,omitempty"`
}

// ValuePropConfig represents a value proposition
type ValuePropConfig struct {
	Title       string `yaml:"title,omitempty" json:"title,omitempty"`
	Description string `yaml:"description,omitempty" json:"description,omitempty"`
	Icon        string `yaml:"icon,omitempty" json:"icon,omitempty"`
}

// FeatureConfig represents a single feature item
type FeatureConfig struct {
	Title       string `yaml:"title,omitempty" json:"title,omitempty"`
	Description string `yaml:"description,omitempty" json:"description,omitempty"`
	Icon        string `yaml:"icon,omitempty" json:"icon,omitempty"`
	ImageURL    string `yaml:"image_url,omitempty" json:"image_url,omitempty"`
}

// SocialProofConfig represents social proof section
type SocialProofConfig struct {
	Logos        []string            `yaml:"logos,omitempty" json:"logos,omitempty"`
	Testimonial  TestimonialConfig   `yaml:"testimonial,omitempty" json:"testimonial,omitzero"`
	Testimonials []TestimonialConfig `yaml:"testimonials,omitempty" json:"testimonials,omitempty"`
}

// TestimonialConfig represents a testimonial
type TestimonialConfig struct {
	Quote  string `yaml:"quote,omitempty" json:"quote,omitempty"`
	Author string `yaml:"author,omitempty" json:"author,omitempty"`
	Role   string `yaml:"role,omitempty" json:"role,omitempty"`
	Avatar string `yaml:"avatar,omitempty" json:"avatar,omitempty"`
}

// PricingConfig represents pricing section
type PricingConfig struct {
	Headline    string              `yaml:"headline,omitempty" json:"headline,omitempty"`
	Subheadline string              `yaml:"subheadline,omitempty" json:"subheadline,omitempty"`
	Plans       []PricingPlanConfig `yaml:"plans,omitempty" json:"plans,omitempty"`
}

// PricingPlanConfig represents a pricing plan
type PricingPlanConfig struct {
	Name     string   `yaml:"name,omitempty" json:"name,omitempty"`
	Price    string   `yaml:"price,omitempty" json:"price,omitempty"`
	Period   string   `yaml:"period,omitempty" json:"period,omitempty"`
	Features []string `yaml:"features,omitempty" json:"features,omitempty"`
	CTA      string   `yaml:"cta,omitempty" json:"cta,omitempty"`
	Featured bool     `yaml:"featured,omitempty" json:"featured,omitempty"`
}

// CTASectionConfig represents the final CTA section
type CTASectionConfig struct {
	Headline    string    `yaml:"headline,omitempty" json:"headline,omitempty"`
	Subheadline string    `yaml:"subheadline,omitempty" json:"subheadline,omitempty"`
	Button      CTAButton `yaml:"button,omitempty" json:"button,omitzero"`
}

// BlogSectionConfig represents blog section settings on the landing page
type BlogSectionConfig struct {
	Enabled     bool      `yaml:"enabled,omitempty" json:"enabled,omitempty"`
	Headline    string    `yaml:"headline,omitempty" json:"headline,omitempty"`
	Subheadline string    `yaml:"subheadline,omitempty" json:"subheadline,omitempty"`
	MaxPosts    int       `yaml:"max_posts,omitempty" json:"max_posts,omitempty"`       // default 3
	ShowExcerpt bool      `yaml:"show_excerpt,omitempty" json:"show_excerpt,omitempty"` // show subtitle as excerpt
	CTAButton   CTAButton `yaml:"cta_button,omitempty" json:"cta_button,omitzero"`      // "View All Posts" link
}

// GallerySectionConfig represents gallery section settings on the landing page
type GallerySectionConfig struct {
	Enabled     bool   `yaml:"enabled,omitempty" json:"enabled,omitempty"`
	Headline    string `yaml:"headline,omitempty" json:"headline,omitempty"`
	Subheadline string `yaml:"subheadline,omitempty" json:"subheadline,omitempty"`
	MaxImages   int    `yaml:"max_images,omitempty" json:"max_images,omitempty"` // default 6
	Columns     int    `yaml:"columns,omitempty" json:"columns,omitempty"`       // grid columns, default 3
}

// ComparisonSectionConfig represents a feature comparison matrix section
type ComparisonSectionConfig struct {
	Enabled     bool                     `yaml:"enabled,omitempty" json:"enabled,omitempty"`
	Headline    string                   `yaml:"headline,omitempty" json:"headline,omitempty"`
	Subheadline string                   `yaml:"subheadline,omitempty" json:"subheadline,omitempty"`
	Columns     []ComparisonColumnConfig `yaml:"columns,omitempty" json:"columns,omitempty"`
	Groups      []ComparisonGroupConfig  `yaml:"groups,omitempty" json:"groups,omitempty"`
}

// HasData returns true if the comparison section has columns and at least one feature
func (c *ComparisonSectionConfig) HasData() bool {
	if len(c.Columns) == 0 || len(c.Groups) == 0 {
		return false
	}
	for _, g := range c.Groups {
		if len(g.Features) > 0 {
			return true
		}
	}
	return false
}

// ComparisonColumnConfig represents a column header in the comparison table
type ComparisonColumnConfig struct {
	Name      string `yaml:"name,omitempty" json:"name,omitempty"`
	Highlight bool   `yaml:"highlight,omitempty" json:"highlight,omitempty"`
}

// ComparisonGroupConfig represents a group of features in the comparison table
type ComparisonGroupConfig struct {
	Name     string                    `yaml:"name,omitempty" json:"name,omitempty"`
	Features []ComparisonFeatureConfig `yaml:"features,omitempty" json:"features,omitempty"`
}

// ComparisonFeatureConfig represents a single feature row in the comparison table
type ComparisonFeatureConfig struct {
	Name   string   `yaml:"name,omitempty" json:"name,omitempty"`
	Values []string `yaml:"values,omitempty" json:"values,omitempty"` // "true"/"false" for check/x, anything else displayed as text
}

// NavigationConfig controls which built-in navigation links appear in the header and footer
type NavigationConfig struct {
	ShowDocs       bool `yaml:"show_docs,omitempty" json:"show_docs,omitempty"`
	ShowAPI        bool `yaml:"show_api,omitempty" json:"show_api,omitempty"`
	ShowRepository bool `yaml:"show_repository,omitempty" json:"show_repository,omitempty"`
	ShowReleases   bool `yaml:"show_releases,omitempty" json:"show_releases,omitempty"`
	ShowIssues     bool `yaml:"show_issues,omitempty" json:"show_issues,omitempty"`
	// Translatable labels for nav items and section headers (defaults to English)
	LabelValueProps string `yaml:"label_value_props,omitempty" json:"label_value_props,omitempty"`
	LabelFeatures   string `yaml:"label_features,omitempty" json:"label_features,omitempty"`
	LabelPricing    string `yaml:"label_pricing,omitempty" json:"label_pricing,omitempty"`
	LabelBlog       string `yaml:"label_blog,omitempty" json:"label_blog,omitempty"`
	LabelGallery    string `yaml:"label_gallery,omitempty" json:"label_gallery,omitempty"`
	LabelCompare    string `yaml:"label_compare,omitempty" json:"label_compare,omitempty"`
	LabelDocs       string `yaml:"label_docs,omitempty" json:"label_docs,omitempty"`
	LabelReleases   string `yaml:"label_releases,omitempty" json:"label_releases,omitempty"`
	LabelAPI        string `yaml:"label_api,omitempty" json:"label_api,omitempty"`
	LabelIssues     string `yaml:"label_issues,omitempty" json:"label_issues,omitempty"`
}

// FooterConfig represents footer settings
type FooterConfig struct {
	Links         []FooterLink `yaml:"links,omitempty" json:"links,omitempty"`
	Social        []SocialLink `yaml:"social,omitempty" json:"social,omitempty"`
	Copyright     string       `yaml:"copyright,omitempty" json:"copyright,omitempty"`
	ShowPoweredBy bool         `yaml:"show_powered_by,omitempty" json:"show_powered_by,omitempty"`
}

// FooterLink represents a single footer link
type FooterLink struct {
	Label string `yaml:"label,omitempty" json:"label,omitempty"`
	URL   string `yaml:"url,omitempty" json:"url,omitempty"`
}

// SocialLink represents a social media link
type SocialLink struct {
	Platform string `yaml:"platform,omitempty" json:"platform,omitempty"` // bluesky, discord, facebook, github, instagram, linkedin, mastodon, reddit, rss, substack, threads, tiktok, twitch, twitter, youtube
	URL      string `yaml:"url,omitempty" json:"url,omitempty"`
}

// ThemeConfig represents theme customization
type ThemeConfig struct {
	PrimaryColor string `yaml:"primary_color,omitempty" json:"primary_color,omitempty"`
	AccentColor  string `yaml:"accent_color,omitempty" json:"accent_color,omitempty"`
	Mode         string `yaml:"mode,omitempty" json:"mode,omitempty"` // light, dark, auto
}

// SEOConfig represents SEO and social sharing settings
type SEOConfig struct {
	Title         string   `yaml:"title,omitempty" json:"title,omitempty"`
	Description   string   `yaml:"description,omitempty" json:"description,omitempty"`
	Keywords      []string `yaml:"keywords,omitempty" json:"keywords,omitempty"`
	OGImage       string   `yaml:"og_image,omitempty" json:"og_image,omitempty"`
	UseMediaKitOG bool     `yaml:"use_media_kit_og,omitempty" json:"use_media_kit_og,omitempty"`
	TwitterCard   string   `yaml:"twitter_card,omitempty" json:"twitter_card,omitempty"`
	TwitterSite   string   `yaml:"twitter_site,omitempty" json:"twitter_site,omitempty"`
}

// AnalyticsConfig represents analytics settings
type AnalyticsConfig struct {
	Plausible       string      `yaml:"plausible,omitempty" json:"plausible,omitempty"`
	Umami           UmamiConfig `yaml:"umami,omitempty" json:"umami,omitzero"`
	GoogleAnalytics string      `yaml:"google_analytics,omitempty" json:"google_analytics,omitempty"`
}

// UmamiConfig represents Umami analytics settings
type UmamiConfig struct {
	WebsiteID string `yaml:"website_id,omitempty" json:"website_id,omitempty"`
	URL       string `yaml:"url,omitempty" json:"url,omitempty"`
}

// ExperimentConfig represents A/B testing experiment settings
type ExperimentConfig struct {
	Enabled          bool `yaml:"enabled,omitempty" json:"enabled,omitempty"`
	AutoOptimize     bool `yaml:"auto_optimize,omitempty" json:"auto_optimize,omitempty"`
	MinImpressions   int  `yaml:"min_impressions,omitempty" json:"min_impressions,omitempty"`
	ApprovalRequired bool `yaml:"approval_required,omitempty" json:"approval_required,omitempty"`
}

// I18nConfig represents multi-language settings for the landing page
type I18nConfig struct {
	DefaultLang string   `yaml:"default_lang,omitempty" json:"default_lang,omitempty"`
	Languages   []string `yaml:"languages,omitempty" json:"languages,omitempty"`
}

// LanguageDisplayNames returns a map of language codes to native display names
func LanguageDisplayNames() map[string]string {
	return map[string]string{
		"en": "English",
		"es": "Español",
		"de": "Deutsch",
		"fr": "Français",
		"ja": "日本語",
		"zh": "中文",
		"pt": "Português",
		"ru": "Русский",
		"ko": "한국어",
		"it": "Italiano",
		"hi": "हिन्दी",
		"ar": "العربية",
		"nl": "Nederlands",
		"pl": "Polski",
		"tr": "Türkçe",
	}
}

// AdvancedConfig represents advanced settings
type AdvancedConfig struct {
	CustomCSS          string            `yaml:"custom_css,omitempty" json:"custom_css,omitempty"`
	CustomHead         string            `yaml:"custom_head,omitempty" json:"custom_head,omitempty"`
	Redirects          map[string]string `yaml:"redirects,omitempty" json:"redirects,omitempty"`
	StaticRoutes       []string          `yaml:"static_routes,omitempty" json:"static_routes,omitempty"`
	PublicReleases     bool              `yaml:"public_releases,omitempty" json:"public_releases,omitempty"`
	HideMobileReleases bool              `yaml:"hide_mobile_releases,omitempty" json:"hide_mobile_releases,omitempty"`
	GooglePlayID       string            `yaml:"google_play_id,omitempty" json:"google_play_id,omitempty"`
	AppStoreID         string            `yaml:"app_store_id,omitempty" json:"app_store_id,omitempty"`
}

// ParseLandingConfig parses a landing.yaml file content
func ParseLandingConfig(content []byte) (*LandingConfig, error) {
	config := &LandingConfig{
		Enabled:  true,
		Template: "open-source-hero",
	}

	if err := yaml.Unmarshal(content, config); err != nil {
		return nil, err
	}

	// Apply defaults
	if config.Template == "" {
		config.Template = "open-source-hero"
	}
	if config.Theme.Mode == "" {
		config.Theme.Mode = "auto"
	}

	return config, nil
}

// HashConfig returns a SHA256 hash of the config content for change detection
func HashConfig(content []byte) string {
	hash := sha256.Sum256(content)
	return hex.EncodeToString(hash[:])
}

// DefaultConfig returns a default landing page configuration
func DefaultConfig() *LandingConfig {
	return &LandingConfig{
		Enabled:  true,
		Template: "open-source-hero",
		Hero: HeroConfig{
			Headline:    "Build something amazing",
			Subheadline: "A powerful toolkit for developers who want to ship fast.",
			PrimaryCTA: CTAButton{
				Label: "Get Started",
				URL:   "#",
			},
			SecondaryCTA: CTAButton{
				Label: "View on GitHub",
				URL:   "#",
			},
		},
		Stats: []StatConfig{
			{Value: "10k+", Label: "Downloads"},
			{Value: "100+", Label: "Contributors"},
			{Value: "MIT", Label: "License"},
		},
		ValueProps: []ValuePropConfig{
			{Title: "Fast", Description: "Optimized for performance out of the box.", Icon: "zap"},
			{Title: "Flexible", Description: "Adapts to your workflow, not the other way around.", Icon: "gear"},
			{Title: "Open Source", Description: "Free forever. Community driven.", Icon: "heart"},
		},
		Navigation: NavigationConfig{
			ShowDocs:       true,
			ShowRepository: true,
			ShowReleases:   true,
		},
		CTASection: CTASectionConfig{
			Headline:    "Ready to get started?",
			Subheadline: "Join thousands of developers already using this project.",
			Button: CTAButton{
				Label: "Get Started Free",
				URL:   "#",
			},
		},
		Footer: FooterConfig{
			ShowPoweredBy: true,
		},
		Theme: ThemeConfig{
			Mode: "auto",
		},
	}
}

// ValidTemplates returns the list of valid template names
func ValidTemplates() []string {
	return []string{"open-source-hero", "minimalist-docs", "saas-conversion", "bold-marketing", "documentation-first", "developer-tool", "visual-showcase", "cli-terminal", "architecture-deep-dive"}
}

// IsValidTemplate checks if a template name is valid
func IsValidTemplate(name string) bool {
	return slices.Contains(ValidTemplates(), name)
}

// TemplateDisplayNames returns a map of template names to display names
func TemplateDisplayNames() map[string]string {
	return map[string]string{
		"open-source-hero":       "Open Source Product",
		"minimalist-docs":        "Minimalist Product",
		"saas-conversion":        "SaaS Product",
		"bold-marketing":         "Bold Marketing Product",
		"documentation-first":    "Documentation First",
		"developer-tool":         "Developer Tool",
		"visual-showcase":        "Visual Showcase",
		"cli-terminal":           "CLI Terminal",
		"architecture-deep-dive": "Architecture Deep Dive",
	}
}

// TemplateDefaultLabels returns the template-specific default section labels.
// These are the creative names each template uses for its sections.
func TemplateDefaultLabels(template string) NavigationConfig {
	switch template {
	case "architecture-deep-dive":
		return NavigationConfig{
			LabelValueProps: "Systems Analysis",
			LabelFeatures:   "Technical Specifications",
			LabelPricing:    "Resource Allocation",
			LabelBlog:       "Dispatches",
			LabelGallery:    "Visual Index",
			LabelCompare:    "Compare",
		}
	case "bold-marketing":
		return NavigationConfig{
			LabelValueProps: "Why choose this",
			LabelFeatures:   "Capabilities",
			LabelPricing:    "Investment",
			LabelBlog:       "Blog",
			LabelGallery:    "Gallery",
			LabelCompare:    "Compare",
		}
	case "minimalist-docs":
		return NavigationConfig{
			LabelValueProps: "Why choose this",
			LabelFeatures:   "Capabilities",
			LabelPricing:    "Investment",
			LabelBlog:       "Blog",
			LabelGallery:    "Gallery",
			LabelCompare:    "Compare",
		}
	case "open-source-hero":
		return NavigationConfig{
			LabelValueProps: "Why choose us",
			LabelFeatures:   "Capabilities",
			LabelPricing:    "Pricing",
			LabelBlog:       "Blog",
			LabelGallery:    "Gallery",
			LabelCompare:    "Compare",
		}
	case "saas-conversion":
		return NavigationConfig{
			LabelValueProps: "Why",
			LabelFeatures:   "Features",
			LabelPricing:    "Pricing",
			LabelBlog:       "Blog",
			LabelGallery:    "Gallery",
			LabelCompare:    "Compare",
		}
	default:
		// developer-tool, documentation-first, visual-showcase, cli-terminal
		return NavigationConfig{
			LabelValueProps: "Why choose us",
			LabelFeatures:   "Capabilities",
			LabelPricing:    "Pricing",
			LabelBlog:       "Blog",
			LabelGallery:    "Gallery",
			LabelCompare:    "Compare",
		}
	}
}