package controller

import (
	"butterfliu/internal/service"
	"encoding/json"
	"log"
	"net/http"
	"strconv"
	"sync"

	"github.com/go-chi/chi/v5"
)

type LibraryController struct {
	service    *service.LibraryService
	scanMutex  sync.Mutex
	isScanning bool
}

func NewLibraryController(service *service.LibraryService) *LibraryController {
	return &LibraryController{service: service}
}

func (c *LibraryController) GetAll(w http.ResponseWriter, r *http.Request) {
	libraries, err := c.service.GetAll()
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	jsonResponse(w, libraries, http.StatusOK)
}

func (c *LibraryController) Create(w http.ResponseWriter, r *http.Request) {
	var req struct {
		Name string `json:"name"`
		Path string `json:"path"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		jsonError(w, err.Error(), http.StatusBadRequest)
		return
	}
	if req.Name == "" || req.Path == "" {
		jsonError(w, "name and path are required", http.StatusBadRequest)
		return
	}
	_, err := c.service.Create(req.Name, req.Path)
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	jsonMsg(w, "Add library successfully.")
}

func (c *LibraryController) GetByID(w http.ResponseWriter, r *http.Request) {
	idParam := chi.URLParam(r, "id")
	id, err := strconv.Atoi(idParam)
	if err != nil {
		jsonError(w, err.Error(), http.StatusBadRequest)
		return
	}
	l, err := c.service.GetByID(id)
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	jsonResponse(w, l, http.StatusOK)
}

func (c *LibraryController) UpdateName(w http.ResponseWriter, r *http.Request) {
	idParam := chi.URLParam(r, "id")
	id, err := strconv.Atoi(idParam)
	if err != nil {
		jsonError(w, err.Error(), http.StatusBadRequest)
		return
	}

	var name string
	if err := json.NewDecoder(r.Body).Decode(&name); err != nil {
		jsonError(w, err.Error(), http.StatusBadRequest)
		return
	}

	err = c.service.UpdateName(id, name)
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	jsonMsg(w, "Updated library name.")
}

func (c *LibraryController) UpdatePath(w http.ResponseWriter, r *http.Request) {
	idParam := chi.URLParam(r, "id")
	id, err := strconv.Atoi(idParam)
	if err != nil {
		jsonError(w, err.Error(), http.StatusBadRequest)
		return
	}

	var path string
	if err := json.NewDecoder(r.Body).Decode(&path); err != nil {
		jsonError(w, err.Error(), http.StatusBadRequest)
		return
	}

	err = c.service.UpdatePath(id, path)
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	jsonMsg(w, "Updated library path.")
}

func (c *LibraryController) Scan(w http.ResponseWriter, r *http.Request) {
	c.scanMutex.Lock()
	if c.isScanning {
		c.scanMutex.Unlock()
		jsonError(w, "Another scan is already in progress", http.StatusConflict)
		return
	}
	c.isScanning = true
	c.scanMutex.Unlock()

	idParam := chi.URLParam(r, "id")
	id, err := strconv.Atoi(idParam)
	if err != nil {
		c.scanMutex.Lock()
		c.isScanning = false
		c.scanMutex.Unlock()
		jsonError(w, err.Error(), http.StatusBadRequest)
		return
	}

	go func() {
		defer func() {
			c.scanMutex.Lock()
			c.isScanning = false
			c.scanMutex.Unlock()
		}()

		report, err := c.service.Scan(id)
		if err != nil {
			log.Printf("Scan failed for library %d: %v", id, err)
			return
		}

		log.Printf("Scan completed for library %d: %+v", id, report)
	}()

	jsonMsg(w, "Library scan started.")
}

func (c *LibraryController) GetScanStatus(w http.ResponseWriter, r *http.Request) {
	c.scanMutex.Lock()
	scanning := c.isScanning
	c.scanMutex.Unlock()
	jsonResponse(w, map[string]bool{"scanning": scanning}, http.StatusOK)
}

func (c *LibraryController) Delete(w http.ResponseWriter, r *http.Request) {
	idParam := chi.URLParam(r, "id")
	id, err := strconv.Atoi(idParam)
	if err != nil {
		jsonError(w, err.Error(), http.StatusBadRequest)
		return
	}
	err = c.service.Delete(id)
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	jsonMsg(w, "Deleted library.")
}

func (c *LibraryController) GetSongs(w http.ResponseWriter, r *http.Request) {
	idParam := chi.URLParam(r, "id")
	id, err := strconv.Atoi(idParam)
	if err != nil {
		jsonError(w, err.Error(), http.StatusBadRequest)
		return
	}
	songs, err := c.service.GetSongs(id)
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	jsonResponse(w, songs, http.StatusOK)
}

func (c *LibraryController) GetArtists(w http.ResponseWriter, r *http.Request) {
	artists, err := c.service.GetArtists()
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	jsonResponse(w, artists, http.StatusOK)
}

func (c *LibraryController) GetAlbums(w http.ResponseWriter, r *http.Request) {
	albums, err := c.service.GetAlbums()
	if err != nil {
		jsonError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	jsonResponse(w, albums, http.StatusOK)
}