// Package client provides methods for interacting with Yandex Music API endpoints.
package client

import (
	"context"
	"fmt"

	"gitea.mrixs.me/Mrixs/yandex-music-api-go/internal/models"
	"gitea.mrixs.me/Mrixs/yandex-music-api-go/internal/utils"
)

// GetPlaylists gets playlists by their kind IDs (GET /playlists).
// Returns a slice of Playlist pointers, or nil if no kinds are provided.
func (c *Client) GetPlaylists(ctx context.Context, kinds []int) ([]*models.Playlist, error) {
	if len(kinds) == 0 {
		return nil, nil
	}

	// Convert kinds to string
	kindsStr := ""
	for i, k := range kinds {
		if i > 0 {
			kindsStr += ","
		}
		kindsStr += fmt.Sprintf("%d", k)
	}

	params := map[string]string{
		"kinds": kindsStr,
	}

	var result []models.Playlist
	if err := c.request.Get(ctx, "/playlists", params, &result); err != nil {
		return nil, err
	}

	playlists := make([]*models.Playlist, len(result))
	for i := range result {
		result[i].SetClient(c)
		playlists[i] = &result[i]
	}
	return playlists, nil
}

// GetPlaylist gets a single playlist by kind using GetPlaylists.
// Returns an error if no playlist is found with the given kind.
func (c *Client) GetPlaylist(ctx context.Context, kind int) (*models.Playlist, error) {
	playlists, err := c.GetPlaylists(ctx, []int{kind})
	if err != nil {
		return nil, err
	}
	if len(playlists) == 0 {
		return nil, utils.NewYandexMusicError("playlist not found", utils.ErrNotFound)
	}
	return playlists[0], nil
}

// GetUserPlaylists gets playlists for a user (GET /users/{userID}/playlists).
func (c *Client) GetUserPlaylists(ctx context.Context, userID string) ([]*models.Playlist, error) {
	var result []models.Playlist
	if err := c.request.Get(ctx, fmt.Sprintf("/users/%s/playlists", userID), nil, &result); err != nil {
		return nil, err
	}

	playlists := make([]*models.Playlist, len(result))
	for i := range result {
		result[i].SetClient(c)
		playlists[i] = &result[i]
	}
	return playlists, nil
}

// CreatePlaylist creates a new playlist (POST /users/me/playlists).
// The visibility parameter should be "public" or "private".
func (c *Client) CreatePlaylist(ctx context.Context, title string, visibility string) (*models.Playlist, error) {
	params := map[string]string{
		"title":      title,
		"visibility": visibility, // "public" or "private"
	}

	var result models.Playlist
	if err := c.request.Post(ctx, "/users/me/playlists", params, &result); err != nil {
		return nil, err
	}
	result.SetClient(c)
	return &result, nil
}

// EditPlaylist edits an existing playlist (PUT /users/me/playlists).
// Only non-empty parameters are updated.
func (c *Client) EditPlaylist(ctx context.Context, kind int, title, description, visibility string) (*models.Playlist, error) {
	params := map[string]string{
		"kind": fmt.Sprintf("%d", kind),
	}
	if title != "" {
		params["title"] = title
	}
	if description != "" {
		params["description"] = description
	}
	if visibility != "" {
		params["visibility"] = visibility
	}

	var result models.Playlist
	if err := c.request.Put(ctx, "/users/me/playlists", params, &result); err != nil {
		return nil, err
	}
	result.SetClient(c)
	return &result, nil
}

// DeletePlaylist deletes a playlist (DELETE /users/me/playlists).
func (c *Client) DeletePlaylist(ctx context.Context, kind int) error {
	params := map[string]string{
		"kind": fmt.Sprintf("%d", kind),
	}
	var result map[string]any
	return c.request.Delete(ctx, "/users/me/playlists", params, &result)
}

// AddTracksToPlaylist adds tracks to a playlist (POST /users/me/playlists/tracks).
// The revision parameter is the current playlist revision for optimistic concurrency.
func (c *Client) AddTracksToPlaylist(ctx context.Context, kind int, trackIDs []string, revision int) (*models.Playlist, error) {
	if len(trackIDs) == 0 {
		return nil, utils.NewYandexMusicError("no tracks provided", utils.ErrBadRequest)
	}

	tracksStr := ""
	for i, id := range trackIDs {
		if i > 0 {
			tracksStr += ","
		}
		tracksStr += id
	}

	params := map[string]string{
		"kind":      fmt.Sprintf("%d", kind),
		"track_ids": tracksStr,
		"revision":  fmt.Sprintf("%d", revision),
	}

	var result models.Playlist
	if err := c.request.Post(ctx, "/users/me/playlists/tracks", params, &result); err != nil {
		return nil, err
	}
	result.SetClient(c)
	return &result, nil
}

// RemoveTracksFromPlaylist removes tracks from a playlist (DELETE /users/me/playlists/tracks).
// The revision parameter is the current playlist revision for optimistic concurrency.
func (c *Client) RemoveTracksFromPlaylist(ctx context.Context, kind int, trackIDs []string, revision int) (*models.Playlist, error) {
	if len(trackIDs) == 0 {
		return nil, utils.NewYandexMusicError("no tracks provided", utils.ErrBadRequest)
	}

	tracksStr := ""
	for i, id := range trackIDs {
		if i > 0 {
			tracksStr += ","
		}
		tracksStr += id
	}

	params := map[string]string{
		"kind":      fmt.Sprintf("%d", kind),
		"track_ids": tracksStr,
		"revision":  fmt.Sprintf("%d", revision),
	}

	var result models.Playlist
	if err := c.request.Delete(ctx, "/users/me/playlists/tracks", params, &result); err != nil {
		return nil, err
	}
	result.SetClient(c)
	return &result, nil
}

// ReorderPlaylistTracks reorders tracks in a playlist (PUT /users/me/playlists/tracks/reorder).
// The from and to parameters specify the position range to move.
func (c *Client) ReorderPlaylistTracks(ctx context.Context, kind int, from, to, revision int) (*models.Playlist, error) {
	params := map[string]string{
		"kind":     fmt.Sprintf("%d", kind),
		"from":     fmt.Sprintf("%d", from),
		"to":       fmt.Sprintf("%d", to),
		"revision": fmt.Sprintf("%d", revision),
	}

	var result models.Playlist
	if err := c.request.Put(ctx, "/users/me/playlists/tracks/reorder", params, &result); err != nil {
		return nil, err
	}
	result.SetClient(c)
	return &result, nil
}

// GetPlaylistRecommendations gets playlist recommendations based on a playlist kind (GET /playlists/recommendations).
func (c *Client) GetPlaylistRecommendations(ctx context.Context, kind int) ([]*models.Playlist, error) {
	params := map[string]string{
		"kind": fmt.Sprintf("%d", kind),
	}

	var result []models.Playlist
	if err := c.request.Get(ctx, "/playlists/recommendations", params, &result); err != nil {
		return nil, err
	}

	playlists := make([]*models.Playlist, len(result))
	for i := range result {
		result[i].SetClient(c)
		playlists[i] = &result[i]
	}
	return playlists, nil
}