gitcaddy-server/routers/web/pages/pages.go

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

package pages

import (
	"crypto/rand"
	"encoding/hex"
	"errors"
	"fmt"
	"html/template"
	"io"
	"math/big"
	"net/http"
	"path"
	"slices"
	"strconv"
	"strings"
	"time"

	blog_model "code.gitcaddy.com/server/v3/models/blog"
	pages_model "code.gitcaddy.com/server/v3/models/pages"
	"code.gitcaddy.com/server/v3/models/renderhelper"
	repo_model "code.gitcaddy.com/server/v3/models/repo"
	"code.gitcaddy.com/server/v3/modules/git"
	"code.gitcaddy.com/server/v3/modules/json"
	"code.gitcaddy.com/server/v3/modules/log"
	"code.gitcaddy.com/server/v3/modules/markup/markdown"
	pages_module "code.gitcaddy.com/server/v3/modules/pages"
	"code.gitcaddy.com/server/v3/modules/templates"
	"code.gitcaddy.com/server/v3/services/context"
	pages_service "code.gitcaddy.com/server/v3/services/pages"
)

const (
	tplPagesOpenSourceHero templates.TplName = "pages/open-source-hero"
	tplPagesMinimalistDocs templates.TplName = "pages/minimalist-docs"
	tplPagesSaasConversion templates.TplName = "pages/saas-conversion"
	tplPagesBoldMarketing  templates.TplName = "pages/bold-marketing"
)

// ServeLandingPage serves the landing page for a repository
func ServeLandingPage(ctx *context.Context) {
	// Get the repository from subdomain or custom domain
	repo, config, err := getRepoFromRequest(ctx)
	if err != nil {
		log.Error("Failed to get repo from pages request: %v", err)
		ctx.NotFound(err)
		return
	}

	if repo == nil || config == nil || !config.Enabled {
		ctx.NotFound(errors.New("pages not configured"))
		return
	}

	// Check for redirect
	requestPath := ctx.Req.URL.Path
	if config.Advanced.Redirects != nil {
		if redirect, ok := config.Advanced.Redirects[requestPath]; ok {
			ctx.Redirect(redirect)
			return
		}
	}

	// Handle event tracking POST
	if ctx.Req.Method == http.MethodPost && (requestPath == "/pages/events" || requestPath == "/pages/events/") {
		servePageEvent(ctx, repo)
		return
	}

	// Check for blog paths on custom domain
	if config.Blog.Enabled && repo.BlogEnabled {
		if idStr, found := strings.CutPrefix(requestPath, "/blog/"); found {
			idStr = strings.TrimRight(idStr, "/")
			blogID, err := strconv.ParseInt(idStr, 10, 64)
			if err == nil && blogID > 0 {
				config = applyLanguageOverlay(ctx, repo, config)
				serveBlogDetail(ctx, repo, config, blogID, "/blog")
				return
			}
		} else if requestPath == "/blog" || requestPath == "/blog/" {
			config = applyLanguageOverlay(ctx, repo, config)
			serveBlogList(ctx, repo, config, "/blog")
			return
		}
	}

	// Render the landing page with A/B test variant and language overlay
	ctx.Data["BlogBaseURL"] = "/blog"
	config = assignVariant(ctx, repo, config)
	config = applyLanguageOverlay(ctx, repo, config)
	renderLandingPage(ctx, repo, config)
}

// getRepoFromRequest extracts the repository from the pages request
func getRepoFromRequest(ctx *context.Context) (*repo_model.Repository, *pages_module.LandingConfig, error) {
	host := ctx.Req.Host

	// Check for custom domain first
	repo, err := pages_service.GetRepoByPagesDomain(ctx, host)
	if err == nil && repo != nil {
		config, err := pages_service.GetPagesConfig(ctx, repo)
		if err != nil {
			return nil, nil, err
		}
		return repo, config, nil
	}

	// Parse subdomain: {repo}-{owner}.{domain}
	parts := strings.Split(host, ".")
	if len(parts) < 2 {
		return nil, nil, errors.New("invalid pages subdomain")
	}

	// First part is {repo}-{owner}
	repoOwner := strings.SplitN(parts[0], "-", 2)
	if len(repoOwner) != 2 {
		return nil, nil, errors.New("invalid pages subdomain format")
	}
	repoName := repoOwner[0]
	ownerName := repoOwner[1]

	repo, err = repo_model.GetRepositoryByOwnerAndName(ctx, ownerName, repoName)
	if err != nil {
		return nil, nil, err
	}

	config, err := pages_service.GetPagesConfig(ctx, repo)
	if err != nil {
		return nil, nil, err
	}

	return repo, config, nil
}

// setupLandingPageContext sets up the shared template context data used by both
// the landing page and blog views (nav, footer, logo, repo info, etc.)
func setupLandingPageContext(ctx *context.Context, repo *repo_model.Repository, config *pages_module.LandingConfig) {
	ctx.Data["Repository"] = repo
	ctx.Data["Config"] = config
	if ctx.Data["Title"] == nil || ctx.Data["Title"] == "" {
		ctx.Data["Title"] = getPageTitle(repo, config)
	}
	ctx.Data["PageIsPagesLanding"] = true
	ctx.Data["RepoURL"] = repo.HTMLURL()
	ctx.Data["LogoURL"] = resolveLogoURL(ctx, repo, config)
	ctx.Data["NumStars"] = repo.NumStars
	ctx.Data["NumForks"] = repo.NumForks
	ctx.Data["Year"] = time.Now().Year()

	// Load latest release with attachments
	release, err := repo_model.GetLatestReleaseByRepoID(ctx, repo.ID)
	if err == nil && release != nil {
		_ = repo_model.GetReleaseAttachments(ctx, release)
		ctx.Data["LatestRelease"] = release
		ctx.Data["LatestReleaseTag"] = strings.TrimPrefix(release.TagName, "v")
	}
	ctx.Data["PublicReleases"] = config.Advanced.PublicReleases
}

// renderLandingPage renders the landing page based on the template
func renderLandingPage(ctx *context.Context, repo *repo_model.Repository, config *pages_module.LandingConfig) {
	setupLandingPageContext(ctx, repo, config)

	// Load README content
	readme, err := loadReadmeContent(ctx, repo)
	if err != nil {
		log.Warn("Failed to load README: %v", err)
	}
	ctx.Data["ReadmeContent"] = readme

	// Load recent blog posts if blog section is enabled
	if config.Blog.Enabled && repo.BlogEnabled {
		maxPosts := config.Blog.MaxPosts
		if maxPosts <= 0 {
			maxPosts = 3
		}
		posts, _, err := blog_model.GetBlogPostsByRepoID(ctx, &blog_model.BlogPostSearchOptions{
			RepoID:          repo.ID,
			AnyPublicStatus: true,
			Page:            1,
			PageSize:        maxPosts,
		})
		if err == nil && len(posts) > 0 {
			for _, post := range posts {
				_ = post.LoadAuthor(ctx)
				_ = post.LoadFeaturedImage(ctx)
			}
			ctx.Data["BlogPosts"] = posts
		}
	}

	tpl := selectTemplate(config.Template)
	ctx.HTML(http.StatusOK, tpl)
}

// serveBlogDetail renders a single blog post within the landing page theme
func serveBlogDetail(ctx *context.Context, repo *repo_model.Repository, config *pages_module.LandingConfig, blogID int64, blogBaseURL string) {
	post, err := blog_model.GetBlogPostByID(ctx, blogID)
	if err != nil {
		ctx.NotFound(err)
		return
	}

	// Verify post belongs to this repo and is public
	if post.RepoID != repo.ID {
		ctx.NotFound(errors.New("post not found"))
		return
	}
	if post.Status < blog_model.BlogPostPublic {
		ctx.NotFound(errors.New("post not available"))
		return
	}

	_ = post.LoadAuthor(ctx)
	_ = post.LoadFeaturedImage(ctx)

	// Render markdown content
	rctx := renderhelper.NewRenderContextRepoComment(ctx, repo)
	rendered, err := markdown.RenderString(rctx, post.Content)
	if err != nil {
		log.Error("Failed to render blog post markdown: %v", err)
		ctx.ServerError("Failed to render blog post", err)
		return
	}

	ctx.Data["Title"] = post.Title + " - " + getPageTitle(repo, config)
	ctx.Data["BlogBaseURL"] = blogBaseURL
	setupLandingPageContext(ctx, repo, config)

	ctx.Data["PageIsBlogDetail"] = true
	ctx.Data["BlogPost"] = post
	ctx.Data["BlogRenderedContent"] = rendered
	if post.Tags != "" {
		ctx.Data["BlogTags"] = strings.Split(post.Tags, ",")
	}

	tpl := selectTemplate(config.Template)
	ctx.HTML(http.StatusOK, tpl)
}

// serveBlogList renders a paginated list of blog posts within the landing page theme
func serveBlogList(ctx *context.Context, repo *repo_model.Repository, config *pages_module.LandingConfig, blogBaseURL string) {
	page := ctx.FormInt("page")
	if page <= 0 {
		page = 1
	}
	pageSize := 9

	posts, total, err := blog_model.GetBlogPostsByRepoID(ctx, &blog_model.BlogPostSearchOptions{
		RepoID:          repo.ID,
		AnyPublicStatus: true,
		Page:            page,
		PageSize:        pageSize,
	})
	if err != nil {
		ctx.NotFound(err)
		return
	}

	for _, post := range posts {
		_ = post.LoadAuthor(ctx)
		_ = post.LoadFeaturedImage(ctx)
	}

	ctx.Data["Title"] = "Blog - " + getPageTitle(repo, config)
	ctx.Data["BlogBaseURL"] = blogBaseURL
	setupLandingPageContext(ctx, repo, config)

	ctx.Data["PageIsBlogList"] = true
	ctx.Data["BlogListPosts"] = posts
	ctx.Data["BlogListTotal"] = total

	pager := context.NewPagination(int(total), pageSize, page, 5)
	pager.AddParamFromRequest(ctx.Req)
	ctx.Data["Page"] = pager

	tpl := selectTemplate(config.Template)
	ctx.HTML(http.StatusOK, tpl)
}

// resolveLogoURL determines the logo URL based on the brand.logo_source config
func resolveLogoURL(ctx *context.Context, repo *repo_model.Repository, config *pages_module.LandingConfig) string {
	switch config.Brand.LogoSource {
	case "repo":
		return repo.AvatarLink(ctx)
	case "org":
		if err := repo.LoadOwner(ctx); err != nil {
			log.Warn("Failed to load repo owner for logo: %v", err)
			return ""
		}
		return repo.Owner.AvatarLink(ctx)
	default: // "url" or empty
		return config.Brand.LogoURL
	}
}

// getPageTitle returns the page title
func getPageTitle(repo *repo_model.Repository, config *pages_module.LandingConfig) string {
	if config.SEO.Title != "" {
		return config.SEO.Title
	}
	if config.Hero.Headline != "" {
		return config.Hero.Headline
	}
	if config.Brand.Name != "" {
		return config.Brand.Name
	}
	return repo.Name
}

// loadReadmeContent loads and renders the README content
func loadReadmeContent(ctx *context.Context, repo *repo_model.Repository) (template.HTML, error) {
	gitRepo, err := git.OpenRepository(ctx, repo.RepoPath())
	if err != nil {
		return "", err
	}
	defer gitRepo.Close()

	branch := repo.DefaultBranch
	if branch == "" {
		branch = "main"
	}

	commit, err := gitRepo.GetBranchCommit(branch)
	if err != nil {
		return "", err
	}

	// Find README file
	readmePath := findReadmePath(commit)
	if readmePath == "" {
		return "", errors.New("README not found")
	}

	entry, err := commit.GetTreeEntryByPath(readmePath)
	if err != nil {
		return "", err
	}

	reader, err := entry.Blob().DataAsync()
	if err != nil {
		return "", err
	}
	defer reader.Close()

	content := make([]byte, entry.Blob().Size())
	_, err = reader.Read(content)
	if err != nil && err.Error() != "EOF" {
		return "", err
	}

	// Render markdown using renderhelper
	rctx := renderhelper.NewRenderContextRepoFile(ctx, repo)
	rendered, err := markdown.RenderString(rctx, string(content))
	if err != nil {
		return "", err
	}

	return rendered, nil
}

// findReadmePath finds the README file path
func findReadmePath(commit *git.Commit) string {
	// Default README locations
	readmePaths := []string{
		"README.md",
		"readme.md",
		"Readme.md",
		"README.markdown",
		"README.txt",
		"README",
	}

	for _, p := range readmePaths {
		if _, err := commit.GetTreeEntryByPath(p); err == nil {
			return p
		}
	}

	return ""
}

// selectTemplate selects the template based on configuration
func selectTemplate(templateName string) templates.TplName {
	switch templateName {
	case "minimalist-docs":
		return tplPagesMinimalistDocs
	case "saas-conversion":
		return tplPagesSaasConversion
	case "bold-marketing":
		return tplPagesBoldMarketing
	case "open-source-hero":
		return tplPagesOpenSourceHero
	default:
		return tplPagesOpenSourceHero
	}
}

// ServePageAsset serves static assets for the landing page
func ServePageAsset(ctx *context.Context) {
	repo, _, err := getRepoFromRequest(ctx)
	if err != nil {
		ctx.NotFound(err)
		return
	}

	// Get the asset path from URL
	assetPath := strings.TrimPrefix(ctx.Req.URL.Path, "/assets/")
	if assetPath == "" {
		ctx.NotFound(errors.New("asset not found"))
		return
	}

	// Load asset from repository
	gitRepo, err := git.OpenRepository(ctx, repo.RepoPath())
	if err != nil {
		ctx.NotFound(err)
		return
	}
	defer gitRepo.Close()

	branch := repo.DefaultBranch
	if branch == "" {
		branch = "main"
	}

	commit, err := gitRepo.GetBranchCommit(branch)
	if err != nil {
		ctx.NotFound(err)
		return
	}

	// Try assets folder first
	fullPath := path.Join("assets", assetPath)
	entry, err := commit.GetTreeEntryByPath(fullPath)
	if err != nil {
		// Try .gitea/assets
		fullPath = path.Join(".gitea", "assets", assetPath)
		entry, err = commit.GetTreeEntryByPath(fullPath)
		if err != nil {
			ctx.NotFound(err)
			return
		}
	}

	reader, err := entry.Blob().DataAsync()
	if err != nil {
		ctx.ServerError("Failed to read asset", err)
		return
	}
	defer reader.Close()

	// Set content type based on extension
	ext := path.Ext(assetPath)
	contentType := getContentType(ext)
	ctx.Resp.Header().Set("Content-Type", contentType)
	ctx.Resp.Header().Set("Cache-Control", "public, max-age=3600")

	// Stream content
	content := make([]byte, entry.Blob().Size())
	_, err = reader.Read(content)
	if err != nil && err.Error() != "EOF" {
		ctx.ServerError("Failed to read asset", err)
		return
	}

	_, _ = ctx.Resp.Write(content)
}

// ServeRepoLandingPage serves the landing page for a repository via URL path
func ServeRepoLandingPage(ctx *context.Context) {
	repo := ctx.Repo.Repository
	if repo == nil {
		ctx.NotFound(errors.New("repository not found"))
		return
	}

	config, err := pages_service.GetPagesConfig(ctx, repo)
	if err != nil {
		log.Error("Failed to get pages config: %v", err)
		ctx.NotFound(err)
		return
	}

	if config == nil || !config.Enabled {
		ctx.NotFound(errors.New("pages not enabled for this repository"))
		return
	}

	ctx.Data["BlogBaseURL"] = fmt.Sprintf("/%s/%s/pages/blog", repo.OwnerName, repo.Name)
	config = assignVariant(ctx, repo, config)
	config = applyLanguageOverlay(ctx, repo, config)
	renderLandingPage(ctx, repo, config)
}

// ServeRepoBlogList serves the blog listing within the landing page theme via URL path
func ServeRepoBlogList(ctx *context.Context) {
	repo := ctx.Repo.Repository
	if repo == nil {
		ctx.NotFound(errors.New("repository not found"))
		return
	}

	config, err := pages_service.GetPagesConfig(ctx, repo)
	if err != nil || config == nil || !config.Enabled {
		ctx.NotFound(errors.New("pages not enabled"))
		return
	}

	if !config.Blog.Enabled || !repo.BlogEnabled {
		ctx.NotFound(errors.New("blog not enabled"))
		return
	}

	blogBaseURL := fmt.Sprintf("/%s/%s/pages/blog", repo.OwnerName, repo.Name)
	config = applyLanguageOverlay(ctx, repo, config)
	serveBlogList(ctx, repo, config, blogBaseURL)
}

// ServeRepoBlogDetail serves a single blog post within the landing page theme via URL path
func ServeRepoBlogDetail(ctx *context.Context) {
	repo := ctx.Repo.Repository
	if repo == nil {
		ctx.NotFound(errors.New("repository not found"))
		return
	}

	config, err := pages_service.GetPagesConfig(ctx, repo)
	if err != nil || config == nil || !config.Enabled {
		ctx.NotFound(errors.New("pages not enabled"))
		return
	}

	if !config.Blog.Enabled || !repo.BlogEnabled {
		ctx.NotFound(errors.New("blog not enabled"))
		return
	}

	blogID := ctx.PathParamInt64("id")
	if blogID <= 0 {
		ctx.NotFound(errors.New("invalid blog post ID"))
		return
	}

	blogBaseURL := fmt.Sprintf("/%s/%s/pages/blog", repo.OwnerName, repo.Name)
	config = applyLanguageOverlay(ctx, repo, config)
	serveBlogDetail(ctx, repo, config, blogID, blogBaseURL)
}

// ServeRepoPageAsset serves static assets for the landing page via URL path
func ServeRepoPageAsset(ctx *context.Context) {
	repo := ctx.Repo.Repository
	if repo == nil {
		ctx.NotFound(errors.New("repository not found"))
		return
	}

	// Get the asset path from URL
	assetPath := ctx.PathParam("*")
	if assetPath == "" {
		ctx.NotFound(errors.New("asset not found"))
		return
	}

	// Load asset from repository
	gitRepo, err := git.OpenRepository(ctx, repo.RepoPath())
	if err != nil {
		ctx.NotFound(err)
		return
	}
	defer gitRepo.Close()

	branch := repo.DefaultBranch
	if branch == "" {
		branch = "main"
	}

	commit, err := gitRepo.GetBranchCommit(branch)
	if err != nil {
		ctx.NotFound(err)
		return
	}

	// Try assets folder first
	fullPath := path.Join("assets", assetPath)
	entry, err := commit.GetTreeEntryByPath(fullPath)
	if err != nil {
		// Try .gitea/assets
		fullPath = path.Join(".gitea", "assets", assetPath)
		entry, err = commit.GetTreeEntryByPath(fullPath)
		if err != nil {
			ctx.NotFound(err)
			return
		}
	}

	reader, err := entry.Blob().DataAsync()
	if err != nil {
		ctx.ServerError("Failed to read asset", err)
		return
	}
	defer reader.Close()

	// Set content type based on extension
	ext := path.Ext(assetPath)
	contentType := getContentType(ext)
	ctx.Resp.Header().Set("Content-Type", contentType)
	ctx.Resp.Header().Set("Cache-Control", "public, max-age=3600")

	// Stream content
	content := make([]byte, entry.Blob().Size())
	_, err = reader.Read(content)
	if err != nil && err.Error() != "EOF" {
		ctx.ServerError("Failed to read asset", err)
		return
	}

	_, _ = ctx.Resp.Write(content)
}

// servePageEvent handles POST /pages/events for A/B test event tracking
func servePageEvent(ctx *context.Context, repo *repo_model.Repository) {
	body, err := io.ReadAll(io.LimitReader(ctx.Req.Body, 4096))
	if err != nil {
		ctx.Status(http.StatusBadRequest)
		return
	}

	var payload struct {
		EventType    string `json:"event_type"`
		VariantID    int64  `json:"variant_id"`
		ExperimentID int64  `json:"experiment_id"`
		VisitorID    string `json:"visitor_id"`
		Data         string `json:"data"`
	}
	if err := json.Unmarshal(body, &payload); err != nil {
		ctx.Status(http.StatusBadRequest)
		return
	}

	// Validate event type
	validTypes := map[string]bool{
		pages_model.EventTypeImpression:  true,
		pages_model.EventTypeCTAClick:    true,
		pages_model.EventTypeScrollDepth: true,
		pages_model.EventTypeClick:       true,
	}
	if !validTypes[payload.EventType] {
		ctx.Status(http.StatusBadRequest)
		return
	}

	// Record event
	_ = pages_model.CreatePageEvent(ctx, &pages_model.PageEvent{
		RepoID:       repo.ID,
		VariantID:    payload.VariantID,
		ExperimentID: payload.ExperimentID,
		VisitorID:    payload.VisitorID,
		EventType:    payload.EventType,
		EventData:    payload.Data,
	})

	// Update denormalized counters
	if payload.VariantID > 0 {
		switch payload.EventType {
		case pages_model.EventTypeImpression:
			_ = pages_model.IncrementVariantImpressions(ctx, payload.VariantID)
		case pages_model.EventTypeCTAClick:
			_ = pages_model.IncrementVariantConversions(ctx, payload.VariantID)
		}
	}

	ctx.Status(http.StatusNoContent)
}

// ServePageEvent handles POST event tracking via path-based routes
func ServePageEvent(ctx *context.Context) {
	repo := ctx.Repo.Repository
	if repo == nil {
		ctx.Status(http.StatusNotFound)
		return
	}
	servePageEvent(ctx, repo)
}

// assignVariant checks for an active experiment, assigns the visitor to a variant,
// and deep-merges the variant's config overrides onto the base config.
func assignVariant(ctx *context.Context, repo *repo_model.Repository, config *pages_module.LandingConfig) *pages_module.LandingConfig {
	if !config.Experiments.Enabled {
		return config
	}

	exp, err := pages_model.GetActiveExperimentByRepoID(ctx, repo.ID)
	if err != nil || exp == nil {
		return config
	}

	// Ensure visitor ID cookie
	visitorID := ctx.GetSiteCookie("pgvid")
	if visitorID == "" {
		visitorID = generateVisitorID()
		ctx.SetSiteCookie("pgvid", visitorID, 86400*30) // 30 days
	}

	// Check existing variant assignment
	cookieName := fmt.Sprintf("pgvar_%d", exp.ID)
	variantIDStr := ctx.GetSiteCookie(cookieName)
	var variant *pages_model.PageVariant

	if variantIDStr != "" {
		variantID, parseErr := strconv.ParseInt(variantIDStr, 10, 64)
		if parseErr == nil {
			variant, _ = pages_model.GetVariantByID(ctx, variantID)
		}
	}

	if variant == nil {
		// Load all variants and do weighted random assignment
		variants, loadErr := pages_model.GetVariantsByExperimentID(ctx, exp.ID)
		if loadErr != nil || len(variants) == 0 {
			return config
		}
		variant = weightedRandomSelect(variants)
		ctx.SetSiteCookie(cookieName, strconv.FormatInt(variant.ID, 10), 86400*30)
	}

	// Set A/B test template data
	ctx.Data["ABTestActive"] = true
	ctx.Data["ExperimentID"] = exp.ID
	ctx.Data["VariantID"] = variant.ID
	ctx.Data["VisitorID"] = visitorID

	// Determine event tracking URL
	if blogBaseURL, ok := ctx.Data["BlogBaseURL"].(string); ok && strings.Contains(blogBaseURL, "/pages/blog") {
		// Path-based: use repo-scoped events URL
		ctx.Data["EventTrackURL"] = strings.TrimSuffix(blogBaseURL, "/blog") + "/events"
	} else {
		ctx.Data["EventTrackURL"] = "/pages/events"
	}

	// If control variant, no config overrides needed
	if variant.IsControl || variant.ConfigOverride == "" {
		return config
	}

	// Deep-merge variant overrides onto config
	merged, mergeErr := deepMergeConfig(config, variant.ConfigOverride)
	if mergeErr != nil {
		log.Error("Failed to merge variant config: %v", mergeErr)
		return config
	}
	return merged
}

// generateVisitorID creates a random 16-byte hex visitor identifier.
func generateVisitorID() string {
	b := make([]byte, 16)
	_, _ = rand.Read(b)
	return hex.EncodeToString(b)
}

// weightedRandomSelect picks a variant using weighted random selection.
func weightedRandomSelect(variants []*pages_model.PageVariant) *pages_model.PageVariant {
	totalWeight := 0
	for _, v := range variants {
		totalWeight += v.Weight
	}
	if totalWeight <= 0 {
		return variants[0]
	}

	n, _ := rand.Int(rand.Reader, big.NewInt(int64(totalWeight)))
	pick := int(n.Int64())
	cumulative := 0
	for _, v := range variants {
		cumulative += v.Weight
		if pick < cumulative {
			return v
		}
	}
	return variants[len(variants)-1]
}

// deepMergeConfig deep-merges a JSON config override onto a base LandingConfig.
// Only non-zero values in the override replace base values.
func deepMergeConfig(base *pages_module.LandingConfig, overrideJSON string) (*pages_module.LandingConfig, error) {
	// Marshal base to JSON map
	baseJSON, err := json.Marshal(base)
	if err != nil {
		return nil, err
	}

	var baseMap map[string]any
	if err := json.Unmarshal(baseJSON, &baseMap); err != nil {
		return nil, err
	}

	var overrideMap map[string]any
	if err := json.Unmarshal([]byte(overrideJSON), &overrideMap); err != nil {
		return nil, err
	}

	// Deep merge
	merged := deepMerge(baseMap, overrideMap)

	// Unmarshal back to LandingConfig
	mergedJSON, err := json.Marshal(merged)
	if err != nil {
		return nil, err
	}

	var result pages_module.LandingConfig
	if err := json.Unmarshal(mergedJSON, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// deepMerge recursively merges src into dst.
func deepMerge(dst, src map[string]any) map[string]any {
	for key, srcVal := range src {
		if dstVal, ok := dst[key]; ok {
			// Both are maps: recurse
			srcMap, srcIsMap := srcVal.(map[string]any)
			dstMap, dstIsMap := dstVal.(map[string]any)
			if srcIsMap && dstIsMap {
				dst[key] = deepMerge(dstMap, srcMap)
				continue
			}
		}
		dst[key] = srcVal
	}
	return dst
}

// detectPageLanguage determines the active language for a landing page.
// Priority: ?lang= query param > pages_lang cookie > Accept-Language header > default.
func detectPageLanguage(ctx *context.Context, config *pages_module.LandingConfig) string {
	langs := config.I18n.Languages
	if len(langs) == 0 {
		return ""
	}

	defaultLang := config.I18n.DefaultLang
	if defaultLang == "" {
		defaultLang = "en"
	}

	// 1. Explicit ?lang= query parameter
	if qLang := ctx.FormString("lang"); qLang != "" {
		if slices.Contains(langs, qLang) {
			ctx.SetSiteCookie("pages_lang", qLang, 86400*365)
			return qLang
		}
	}

	// 2. Cookie
	if cLang := ctx.GetSiteCookie("pages_lang"); cLang != "" {
		if slices.Contains(langs, cLang) {
			return cLang
		}
	}

	// 3. Accept-Language header
	accept := ctx.Req.Header.Get("Accept-Language")
	if accept != "" {
		for part := range strings.SplitSeq(accept, ",") {
			tag := strings.TrimSpace(strings.SplitN(part, ";", 2)[0])
			// Try exact match first
			if slices.Contains(langs, tag) {
				return tag
			}
			// Try base language (e.g. "en-US" → "en")
			if base, _, found := strings.Cut(tag, "-"); found {
				if slices.Contains(langs, base) {
					return base
				}
			}
		}
	}

	return defaultLang
}

// applyLanguageOverlay loads the translation for the detected language and merges it onto config.
// Sets template data for the language switcher and returns the (possibly merged) config.
func applyLanguageOverlay(ctx *context.Context, repo *repo_model.Repository, config *pages_module.LandingConfig) *pages_module.LandingConfig {
	if len(config.I18n.Languages) == 0 {
		return config
	}

	activeLang := detectPageLanguage(ctx, config)
	defaultLang := config.I18n.DefaultLang
	if defaultLang == "" {
		defaultLang = "en"
	}

	// Set template data for language switcher
	ctx.Data["LangSwitcherEnabled"] = true
	ctx.Data["ActiveLang"] = activeLang
	ctx.Data["AvailableLanguages"] = config.I18n.Languages
	ctx.Data["LanguageNames"] = pages_module.LanguageDisplayNames()

	// If active language is the default, no overlay needed
	if activeLang == defaultLang || activeLang == "" {
		return config
	}

	// Load translation overlay from DB
	translation, err := pages_model.GetTranslation(ctx, repo.ID, activeLang)
	if err != nil {
		log.Error("Failed to load translation for %s: %v", activeLang, err)
		return config
	}
	if translation == nil || translation.ConfigJSON == "" {
		return config
	}

	// Deep-merge translation overlay onto config
	merged, err := deepMergeConfig(config, translation.ConfigJSON)
	if err != nil {
		log.Error("Failed to merge translation config for %s: %v", activeLang, err)
		return config
	}

	return merged
}

// ApproveExperiment handles the email approval link for an A/B test experiment
func ApproveExperiment(ctx *context.Context) {
	handleExperimentAction(ctx, true)
}

// DeclineExperiment handles the email decline link for an A/B test experiment
func DeclineExperiment(ctx *context.Context) {
	handleExperimentAction(ctx, false)
}

func handleExperimentAction(ctx *context.Context, approve bool) {
	tokenStr := ctx.PathParam("token")
	if tokenStr == "" {
		ctx.NotFound(errors.New("missing token"))
		return
	}

	// Extract and verify the token
	expIDStr, err := pages_service.VerifyExperimentToken(ctx, tokenStr)
	if err != nil {
		log.Error("Invalid experiment token: %v", err)
		ctx.NotFound(errors.New("invalid or expired token"))
		return
	}

	expID, err := strconv.ParseInt(expIDStr, 10, 64)
	if err != nil {
		ctx.NotFound(errors.New("invalid experiment ID"))
		return
	}

	exp, err := pages_model.GetExperimentByID(ctx, expID)
	if err != nil || exp == nil {
		ctx.NotFound(errors.New("experiment not found"))
		return
	}

	if approve {
		err = pages_model.UpdateExperimentStatus(ctx, exp.ID, pages_model.ExperimentStatusApproved)
		ctx.Data["Title"] = "Experiment Approved"
		ctx.Data["ExperimentApproved"] = true
	} else {
		err = pages_model.UpdateExperimentStatus(ctx, exp.ID, pages_model.ExperimentStatusPaused)
		ctx.Data["Title"] = "Experiment Declined"
		ctx.Data["ExperimentDeclined"] = true
	}

	if err != nil {
		ctx.ServerError("Failed to update experiment", err)
		return
	}

	ctx.Data["ExperimentName"] = exp.Name
	ctx.HTML(http.StatusOK, "pages/experiment_result")
}

// getContentType returns the content type for a file extension
func getContentType(ext string) string {
	types := map[string]string{
		".html":  "text/html",
		".css":   "text/css",
		".js":    "application/javascript",
		".json":  "application/json",
		".png":   "image/png",
		".jpg":   "image/jpeg",
		".jpeg":  "image/jpeg",
		".gif":   "image/gif",
		".svg":   "image/svg+xml",
		".ico":   "image/x-icon",
		".woff":  "font/woff",
		".woff2": "font/woff2",
		".ttf":   "font/ttf",
		".eot":   "application/vnd.ms-fontobject",
	}

	if ct, ok := types[strings.ToLower(ext)]; ok {
		return ct
	}
	return "application/octet-stream"
}