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/**
 * AltGit - altgit
 *
 * This file is licensed under the Affero General Public License version 3 or
 * later. See the COPYING file.
 *
 * @author Paolo Lulli <kevwe.com>
 * @copyright Paolo Lulli 2026
 */
package rendering

import (
    "html/template"
    "net/http"
    "os"
    "path/filepath"
    "repobrowser/internal/config"
    "repobrowser/internal/gitrepo"
    "strings"

    "github.com/gin-gonic/gin"
)

func RenderPage(c *gin.Context, data PageData) {

    tmpl, err := template.ParseFiles("templates/index.html")
    if err != nil {
        c.String(http.StatusInternalServerError, err.Error())
        return
    }

    c.Status(http.StatusOK)
    c.Header("Content-Type", "text/html; charset=utf-8")
    tmpl.Execute(c.Writer, data)
}

func ActiveBranch(c *gin.Context, def string) string {
    if b := c.Query("branch"); b != "" {
        return b
    }
    return def
}

func RepoPath(cfg config.RepositoryBrowserConfiguration, name string) string {
    if name == "" || strings.Contains(name, "/") || strings.Contains(name, "..") {
        return ""
    }
    p := filepath.Join(cfg.Root, name)
    // Confirm it stays inside reposRoot
    rel, err := filepath.Rel(cfg.Root, p)
    if err != nil || strings.HasPrefix(rel, "..") {
        return ""
    }
    return p
}

// ResolveRepo validates the :repo param and returns (repoName, repoPath).
// Aborts with 404 on bad input.
func ResolveRepo(cfg config.RepositoryBrowserConfiguration, name string) (string, string, bool) {
    //name := c.Param("repo")
    p := RepoPath(cfg, name)
    if p == "" {
        //c.String(http.StatusNotFound, "repository not found")
        return "", "", false
    }
    if _, err := os.Stat(p); err != nil {
        //c.String(http.StatusNotFound, "repository not found")
        return "", "", false
    }
    return name, p, true
}

func BasePageData(c *gin.Context, repoName, rp, tab string, crumb template.HTML) PageData {
    all, cur := gitrepo.ListBranches(rp)
    branch := ActiveBranch(c, cur)
    return PageData{
        Repo:       repoName,
        Branch:     branch,
        Branches:   gitrepo.BuildBranchLinks(all, branch, repoName, tab),
        ActiveTab:  tab,
        Breadcrumb: crumb,
    }
}

func FileIcon(name string) string {
    ext := ""
    if i := strings.LastIndex(name, "."); i >= 0 {
        ext = name[i+1:]
    }
    switch ext {
    case "go":
        return "🔵"
    case "js", "ts", "jsx", "tsx":
        return "🟡"
    case "py":
        return "🟢"
    case "md":
        return "📝"
    case "sh", "bash":
        return "⚙️"
    case "json", "yaml", "yml", "toml":
        return "🔧"
    case "html", "css":
        return "🌐"
    case "rs":
        return "🦀"
    case "c", "cpp", "h":
        return "🔩"
    }
    return "📄"
}