package controllers

import (
	"canguidev/shelfy/internal/models"
	"net/http"
	"net/url"
	"os"
	"path/filepath"
	"strings"
	"time"

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


type Entry struct {
    ID      int64     `json:"ID"`
    Name, Path string
    IsDir      bool
    ModTime    time.Time
    Size       int64
	Children []Entry   `json:"Children,omitempty"`
    Url      string    `json:"Url,omitempty"` // <- Ajout ici


}

func listEntries(base, rel string) ([]Entry, error) {
    dir := filepath.Join(base, rel)
    fis, err := os.ReadDir(dir)
    if err != nil {
        return nil, err
    }
    out := make([]Entry, 0, len(fis))
    for _, fi := range fis {
        info, _ := fi.Info()
        out = append(out, Entry{
            Name:    fi.Name(),
            Path:    filepath.ToSlash(filepath.Join(rel, fi.Name())),
            IsDir:   fi.IsDir(),
            ModTime: info.ModTime(),
            Size:    info.Size(),
        })
    }
    return out, nil
}

func StreamHandler(db *gorm.DB) gin.HandlerFunc {
    return func(c *gin.Context) {
        base := "upload"

        // --- Sanitize du chemin courant ---
        raw := c.Query("path")
        cur := filepath.Clean("/" + strings.TrimSpace(raw)) // force un chemin absolu “virtuel”
        if cur == "/" {
            cur = "" // racine logique sous "upload"
        }
        // Interdit les traversées ou chemins absolus réels
        if strings.Contains(cur, "..") || strings.HasPrefix(raw, "/") {
            c.JSON(http.StatusBadRequest, gin.H{"error": "Chemin invalide"})
            return
        }

        // --- Liste des dossiers du dossier racine (upload/*) ---
        rootEntries, err := listEntries(base, "")
        if err != nil {
            c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to list root entries"})
            return
        }

        // On ne garde que les dossiers et on prépare la liste des noms pour une recherche en BDD
        var dirs []Entry
        var rootNames []string
        for _, e := range rootEntries {
            if e.IsDir {
                dirs = append(dirs, e)
                rootNames = append(rootNames, e.Name)
            }
        }

        // Batch: récupère les IDs pour tous les noms racine (Path = nom simple)
        // (tu peux remplacer "path = ?" par "path_name = ?" si tu préfères)
        var rows []models.PathDownload
        if len(rootNames) > 0 {
            if err := db.Where("path IN ?", rootNames).Find(&rows).Error; err != nil {
                c.JSON(http.StatusInternalServerError, gin.H{"error": "DB lookup failed"})
                return
            }
        }

        // Map nom -> ID (int64)
        idByName := make(map[string]int64, len(rows))
        for _, r := range rows {
            idByName[r.Path] = r.ID // Path = "Film"/"Série"/...
        }

        // Affecte l'ID seulement pour les dossiers racine
        for i := range dirs {
            if id, ok := idByName[dirs[i].Name]; ok {
                dirs[i].ID = id
            } else {
                dirs[i].ID = 0 // non trouvé en BDD
            }
        }

        // --- Liste du chemin courant (upload/<cur>) ---
        entries, err := listEntries(base, cur)
        if err != nil {
            c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to list entries"})
            return
        }

        // IMPORTANT :
        // La BDD ne contient que les dossiers racine.
        // Donc on ne tente de mettre un ID aux entries QUE si on est à la racine.
        if cur == "" && len(entries) > 0 {
            var names []string
            for _, e := range entries {
                if e.IsDir {
                    names = append(names, e.Name)
                }
            }
            var rows2 []models.PathDownload
            if len(names) > 0 {
                if err := db.Where("path IN ?", names).Find(&rows2).Error; err == nil {
                    tmp := make(map[string]int64, len(rows2))
                    for _, r := range rows2 {
                        tmp[r.Path] = r.ID
                    }
                    for i := range entries {
                        if entries[i].IsDir {
                            if id, ok := tmp[entries[i].Name]; ok {
                                entries[i].ID = id
                            }
                        }
                    }
                }
            }
        } else {
            // On laisse ID = 0 pour le contenu interne des catégories (non suivi en BDD)
            for i := range entries {
                entries[i].ID = 0
            }
        }

        c.JSON(http.StatusOK, gin.H{
            "dirs":        dirs,
            "entries":     entries,
            "currentPath": cur,
        })
    }
}



func DetailHandler() gin.HandlerFunc {
	return func(c *gin.Context) {
		base := "upload"
		rel := c.Query("path")
		rel = filepath.Clean("/" + rel)
		rel = strings.TrimPrefix(rel, "/") // => chemin relatif à "upload"

		absPath := filepath.Join(base, rel)
		absPath, err := filepath.Abs(absPath)
		if err != nil {
			c.JSON(500, gin.H{"error": "Path error"})
			return
		}
		baseAbs, err := filepath.Abs(base)
		if err != nil {
			c.JSON(500, gin.H{"error": "Base path error"})
			return
		}
		if !strings.HasPrefix(absPath, baseAbs) {
			c.JSON(403, gin.H{"error": "Access outside base directory is forbidden"})
			return
		}
		info, err := os.Stat(absPath)
		if err != nil {
			c.JSON(404, gin.H{"error": "Path not found"})
			return
		}

		type Entry struct {
			ID       int64     `json:"ID,omitempty"`
			Name     string    `json:"Name"`
			Path     string    `json:"Path"` // <--- Toujours RELATIF à "upload"
			IsDir    bool      `json:"IsDir"`
			ModTime  time.Time `json:"ModTime"`
			Size     int64     `json:"Size"`
			Children []Entry   `json:"Children,omitempty"`
			Url      string    `json:"Url,omitempty"` // <--- Lien d'accès au fichier
		}

		var buildTree func(absPath, relPath string, fi os.FileInfo) (Entry, error)
		buildTree = func(absPath, relPath string, fi os.FileInfo) (Entry, error) {
			entry := Entry{
				Name:    fi.Name(),
				Path:    relPath,   // <-- toujours RELATIF à la racine upload
				IsDir:   fi.IsDir(),
				ModTime: fi.ModTime(),
				Size:    fi.Size(),
			}

			if !fi.IsDir() {
				entry.Url = "/api/v1/folders/file?path=" + url.QueryEscape(relPath)
			}
			if fi.IsDir() {
				f, err := os.Open(absPath)
				if err != nil {
					return entry, err
				}
				defer f.Close()
				files, err := f.Readdir(0)
				if err != nil {
					return entry, err
				}
				for _, child := range files {
					childAbs := filepath.Join(absPath, child.Name())
					childRel := filepath.Join(relPath, child.Name())
					childEntry, err := buildTree(childAbs, childRel, child)
					if err != nil {
						continue
					}
					entry.Children = append(entry.Children, childEntry)
				}
			}
			return entry, nil
		}

		rootEntry, err := buildTree(absPath, rel, info)
		if err != nil {
			c.JSON(500, gin.H{"error": "Tree error"})
			return
		}
		c.JSON(200, rootEntry)
	}
}