package local.epul4a.fotosharing.controller;

import local.epul4a.fotosharing.dto.CommentaireDTO;
import local.epul4a.fotosharing.dto.PartageDTO;
import local.epul4a.fotosharing.dto.PhotoDTO;
import local.epul4a.fotosharing.service.CommentaireService;
import local.epul4a.fotosharing.service.PartageService;
import local.epul4a.fotosharing.service.PhotoService;
import local.epul4a.fotosharing.service.UtilisateurService;
import org.springframework.core.io.Resource;
import org.springframework.data.domain.Page;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.security.core.Authentication;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;

@Controller
public class PhotoController {

    private final PhotoService photoService;
    private final CommentaireService commentaireService;
    private final PartageService partageService;
    private final UtilisateurService utilisateurService;

    public PhotoController(
            PhotoService photoService,
            CommentaireService commentaireService,
            PartageService partageService,
            UtilisateurService utilisateurService
    ) {
        this.photoService = photoService;
        this.commentaireService = commentaireService;
        this.partageService = partageService;
        this.utilisateurService = utilisateurService;
    }


    /* ========================== UPLOAD ========================== */

    @GetMapping("/upload")
    public String uploadForm() {
        return "upload";
    }

    @PostMapping("/upload")
    public String doUpload(@RequestParam("file") MultipartFile file,
                           @RequestParam(value = "visibilite", defaultValue = "PRIVATE") String visibilite,
                           Authentication auth,
                           Model model) {
        try {
            photoService.store(file, visibilite, auth.getName());
            return "redirect:/mes-photos";
        } catch (Exception ex) {
            model.addAttribute("error", ex.getMessage());
            return "upload";
        }
    }


    /* ========================== RAW IMAGE ========================== */

    @GetMapping("/photo/{id}/raw")
    public ResponseEntity<Resource> rawPhoto(@PathVariable Long id) {

        PhotoDTO photo = photoService.getPhotoById(id);
        if (photo == null)
            return ResponseEntity.notFound().build();

        Resource r = photoService.loadAsResource(photo.getUuidFichier());
        if (!r.exists())
            return ResponseEntity.notFound().build();

        return ResponseEntity.ok()
                .contentType(MediaType.IMAGE_JPEG) // simplifiable, ou détecté dans service
                .body(r);
    }


    /* ========================== MES PHOTOS ========================== */

    @GetMapping("/mes-photos")
    public String mesPhotos(
            @RequestParam(defaultValue = "0") int pagePrivees,
            @RequestParam(defaultValue = "0") int pagePubliques,
            @RequestParam(defaultValue = "0") int pagePartagees,
            @RequestParam(defaultValue = "0") int pageMesPartagees,
            Authentication auth, Model model) {

        String email = auth.getName();

        model.addAttribute("photosPrivees",
                photoService.listPrivatePhotos(email, pagePrivees, 12));

        model.addAttribute("photosPubliques",
                photoService.listPublicPhotos(email, pagePubliques, 12));

        model.addAttribute("photosPartagees",
                photoService.listSharedWith(email, pagePartagees, 12));

        model.addAttribute("mesPhotosPartagees",
                photoService.listSharedPhotos(email, pageMesPartagees, 12));

        model.addAttribute("pagePrivees", pagePrivees);
        model.addAttribute("pagePubliques", pagePubliques);
        model.addAttribute("pagePartagees", pagePartagees);
        model.addAttribute("pageMesPartagees", pageMesPartagees);

        return "mes-photos";
    }


    /* ========================== GALERIE ========================== */

    @GetMapping("/galerie")
    public String galerie(@RequestParam(defaultValue = "0") int page, Model model) {

        Page<PhotoDTO> photosPage = photoService.listPublic(page, 12);

        model.addAttribute("photosPage", photosPage);
        model.addAttribute("currentPage", page);

        return "galerie";
    }


    /* ========================== DETAIL PHOTO ========================== */

    @GetMapping("/photo/{id}")
    @PreAuthorize("@securityService.canAccessPhoto(authentication, #id)")
    public String viewPhoto(@PathVariable Long id,
                            @RequestParam(defaultValue = "0") int page,
                            Authentication auth,
                            Model model) {

        PhotoDTO photo = photoService.getPhotoById(id);
        if (photo == null)
            return "redirect:/galerie";

        model.addAttribute("photo", photo);

        Page<CommentaireDTO> commentaires =
                commentaireService.listByPhoto(id, page, 10);
        model.addAttribute("commentairesPage", commentaires);
        model.addAttribute("currentPage", page);

        String currentUser = (auth != null ? auth.getName() : null);
        boolean canComment = partageService.canComment(id, currentUser);
        boolean canAdmin = partageService.canAdmin(id, currentUser);

        model.addAttribute("canComment", canComment);
        model.addAttribute("canAdmin", canAdmin);
        model.addAttribute("currentUser", currentUser);

        model.addAttribute("partages",
                partageService.getPartagesForPhoto(id));

        return "photo-detail";
    }

    /* ========================== COMMENTAIRES ========================== */

    @PostMapping("/photo/{id}/comment")
    public String addComment(@PathVariable Long id,
                             @RequestParam String contenu,
                             Authentication auth) {

        commentaireService.addComment(id, auth.getName(), contenu);
        return "redirect:/photo/" + id;
    }


    /* ========================== PARTAGE PHOTO ========================== */
    @PostMapping("/photo/{id}/share")
    @PreAuthorize("@securityService.canAccessPhoto(authentication, #id)")
    public String sharePhoto(@PathVariable Long id,
                             @RequestParam String email,
                             @RequestParam String permission,
                             Authentication auth) {

        try {
            partageService.share(id, email, permission, auth.getName());
            return "redirect:/photo/" + id + "?shared=ok";
        } catch (RuntimeException ex) {
            return "redirect:/photo/" + id + "?error=" + URLEncoder.encode(ex.getMessage(), StandardCharsets.UTF_8);
        }

    }



    @GetMapping("/photo/{id}/unshare/{email}")
    public String unshare(@PathVariable Long id, @PathVariable String email) {

        partageService.unshare(id, email);
        return "redirect:/photo/" + id;
    }

    /* ========================== MAJ MODE PARTAGE ========================== */
    @PostMapping("/photo/{id}/share/update")
    @PreAuthorize("@securityService.canAccessPhoto(authentication, #id)")
    public String updateShare(
            @PathVariable Long id,
            @RequestParam String email,
            @RequestParam String permission,
            Authentication auth
    ) {
        partageService.updatePermission(id, email, permission, auth.getName());
        return "redirect:/photo/" + id;
    }

}