package api

import (
	"encoding/json"
	"net/http"

	"github.com/fujin/music-agregator/internal/database"
	"github.com/fujin/music-agregator/internal/services"
	"github.com/go-chi/chi/v5"
)

func (h *Handlers) SearchArtists(w http.ResponseWriter, r *http.Request) {
	var req struct {
		Query  string `json:"query"`
		Limit  int32  `json:"limit,omitempty"`
		Offset int32  `json:"offset,omitempty"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body")
		return
	}

	if req.Limit == 0 {
		req.Limit = 10
	}

	result, err := h.MetadataClient.SearchArtists(r.Context(), req.Query, req.Limit, req.Offset)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, result)
}

func (h *Handlers) GetArtistAlbums(w http.ResponseWriter, r *http.Request) {
	artistID := chi.URLParam(r, "id")

	result, err := h.MetadataClient.GetArtistAlbums(r.Context(), artistID, 500, 0)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, result)
}

func (h *Handlers) GetArtist(w http.ResponseWriter, r *http.Request) {
	if h.DB == nil {
		writeError(w, http.StatusServiceUnavailable, "database not connected")
		return
	}

	artistID := chi.URLParam(r, "id")
	if artistID == "" {
		writeError(w, http.StatusBadRequest, "artist ID required")
		return
	}

	artist, err := h.DB.GetArtistByForeignID(r.Context(), artistID)
	if err != nil {
		writeError(w, http.StatusNotFound, "artist not found: "+artistID)
		return
	}

	writeJSON(w, http.StatusOK, artist)
}

func (h *Handlers) EditArtist(w http.ResponseWriter, r *http.Request) {
	if h.DB == nil {
		writeError(w, http.StatusServiceUnavailable, "database not connected")
		return
	}

	artistID := chi.URLParam(r, "id")
	if artistID == "" {
		writeError(w, http.StatusBadRequest, "artist ID required")
		return
	}

	var update database.ArtistUpdate
	if err := json.NewDecoder(r.Body).Decode(&update); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body")
		return
	}

	artist, err := h.DB.UpdateArtistByForeignID(r.Context(), artistID, update)
	if err != nil {
		writeError(w, http.StatusNotFound, "artist not found: "+artistID)
		return
	}

	writeJSON(w, http.StatusOK, artist)
}

func (h *Handlers) DeleteArtist(w http.ResponseWriter, r *http.Request) {
	if h.DB == nil {
		writeError(w, http.StatusServiceUnavailable, "database not connected")
		return
	}

	artistID := chi.URLParam(r, "id")
	if artistID == "" {
		writeError(w, http.StatusBadRequest, "artist ID required")
		return
	}

	deleted, err := h.DB.DeleteArtistByForeignID(r.Context(), artistID)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}

	if !deleted {
		writeError(w, http.StatusNotFound, "artist not found: "+artistID)
		return
	}

	writeJSON(w, http.StatusOK, map[string]any{
		"deleted": true,
		"message": "artist and related data deleted",
	})
}

func (h *Handlers) RefreshArtist(w http.ResponseWriter, r *http.Request) {
	if h.DB == nil {
		writeError(w, http.StatusServiceUnavailable, "database not connected")
		return
	}

	artistID := chi.URLParam(r, "id")
	if artistID == "" {
		writeError(w, http.StatusBadRequest, "artist ID required")
		return
	}

	result, err := services.RefreshArtist(r.Context(), artistID, h.MetadataClient, h.DB)
	if err != nil {
		if _, ok := err.(*services.NotFoundError); ok {
			writeError(w, http.StatusNotFound, err.Error())
			return
		}
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, result)
}

func (h *Handlers) BulkMonitorArtistAlbums(w http.ResponseWriter, r *http.Request) {
	if h.DB == nil {
		writeError(w, http.StatusServiceUnavailable, "database not connected")
		return
	}

	artistID := chi.URLParam(r, "id")
	if artistID == "" {
		writeError(w, http.StatusBadRequest, "artist ID required")
		return
	}

	var req struct {
		Monitored bool `json:"monitored"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body")
		return
	}

	artist, err := h.DB.GetArtistMetadataByForeignID(r.Context(), artistID)
	if err != nil {
		writeError(w, http.StatusNotFound, "artist not found")
		return
	}

	updatedCount, err := h.DB.BulkUpdateAlbumsMonitored(r.Context(), artist.ID, req.Monitored)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}

	albums, _ := h.DB.ListAlbumsByArtist(r.Context(), artist.ID)
	for _, album := range albums {
		if req.Monitored {
			hasFiles, _ := h.DB.HasTrackFiles(r.Context(), album.ID)
			if !hasFiles {
				h.DB.AddToWantedAlbums(r.Context(), album.ID)
			}
		} else {
			h.DB.RemoveFromWantedAlbums(r.Context(), album.ID)
		}
	}

	writeJSON(w, http.StatusOK, map[string]any{
		"updated_count": updatedCount,
		"monitored":     req.Monitored,
	})
}

func (h *Handlers) SearchArtistAlbums(w http.ResponseWriter, r *http.Request) {
	if h.DB == nil {
		writeError(w, http.StatusServiceUnavailable, "database not connected")
		return
	}

	artistID := chi.URLParam(r, "id")
	if artistID == "" {
		writeError(w, http.StatusBadRequest, "artist ID required")
		return
	}

	result, err := services.SearchArtistAlbums(r.Context(), artistID, h.DB, h.IndexerService)
	if err != nil {
		writeError(w, http.StatusNotFound, "artist not found")
		return
	}

	writeJSON(w, http.StatusOK, result)
}