package arr

import (
	"context"
	"fmt"
	"net/http"
	"net/url"
	"strconv"
	"strings"
)

// StatusMessage is a warning or error attached to a queue item, e.g. why an import is blocked.
type StatusMessage struct {
	Title    string   `json:"title"`
	Messages []string `json:"messages"`
}

// QueueItem is an entry of the Radarr/Sonarr download queue.
type QueueItem struct {
	ID                    int             `json:"id"`
	Title                 string          `json:"title"` // release title
	Status                string          `json:"status"`
	TrackedDownloadStatus string          `json:"trackedDownloadStatus"` // ok, warning, error
	TrackedDownloadState  string          `json:"trackedDownloadState"`  // downloading, importPending, importBlocked, ...
	StatusMessages        []StatusMessage `json:"statusMessages"`
	ErrorMessage          string          `json:"errorMessage"`
	Size                  float64         `json:"size"`
	SizeLeft              float64         `json:"sizeleft"`
	TimeLeft              string          `json:"timeleft"`
	DownloadClient        string          `json:"downloadClient"`
	DownloadID            string          `json:"downloadId"` // the download client's id, e.g. SABnzbd's nzo_id
	Indexer               string          `json:"indexer"`
	Protocol              string          `json:"protocol"`

	// Present depending on the include* parameters of the request.
	Movie   *QueueMovie   `json:"movie,omitempty"`
	Series  *QueueSeries  `json:"series,omitempty"`
	Episode *QueueEpisode `json:"episode,omitempty"`
}

// QueueMovie is the movie a queue item belongs to.
type QueueMovie struct {
	Title string `json:"title"`
	Year  int    `json:"year"`
}

// QueueSeries is the series a queue item belongs to.
type QueueSeries struct {
	Title string `json:"title"`
}

// QueueEpisode is the episode a queue item belongs to.
type QueueEpisode struct {
	SeasonNumber  int    `json:"seasonNumber"`
	EpisodeNumber int    `json:"episodeNumber"`
	Title         string `json:"title"`
}

// Name returns a readable name: "Movie (2020)", "Show S01E02", or the release title.
func (q QueueItem) Name() string {
	switch {
	case q.Movie != nil && q.Movie.Title != "":
		if q.Movie.Year > 0 {
			return fmt.Sprintf("%s (%d)", q.Movie.Title, q.Movie.Year)
		}
		return q.Movie.Title
	case q.Series != nil && q.Series.Title != "":
		if q.Episode != nil {
			return fmt.Sprintf("%s S%02dE%02d", q.Series.Title, q.Episode.SeasonNumber, q.Episode.EpisodeNumber)
		}
		return q.Series.Title
	}
	return q.Title
}

// Progress returns the download progress in percent (0-100).
func (q QueueItem) Progress() float64 {
	if q.Size <= 0 {
		return 0
	}
	return min(max((q.Size-q.SizeLeft)/q.Size*100, 0), 100)
}

// NeedsAttention reports whether the item has a warning or error.
func (q QueueItem) NeedsAttention() bool {
	return q.TrackedDownloadStatus == "warning" || q.TrackedDownloadStatus == "error" ||
		q.TrackedDownloadState == "importBlocked" || q.TrackedDownloadState == "failed" ||
		q.TrackedDownloadState == "failedPending"
}

// Problem returns the item's warnings and errors as one line ("" if none).
func (q QueueItem) Problem() string {
	var parts []string
	if q.ErrorMessage != "" {
		parts = append(parts, q.ErrorMessage)
	}
	for _, m := range q.StatusMessages {
		parts = append(parts, m.Messages...)
		if len(m.Messages) == 0 && m.Title != "" {
			parts = append(parts, m.Title)
		}
	}
	return strings.Join(parts, "; ")
}

// QueueWith lists the queue with the given extra query parameters, e.g.
// includeMovie=true. It fetches a single page of up to 200 items.
func (c *Client) QueueWith(ctx context.Context, include url.Values) ([]QueueItem, error) {
	q := url.Values{"page": {"1"}, "pageSize": {"200"}}
	for k, v := range include {
		q[k] = v
	}
	var page struct {
		Records []QueueItem `json:"records"`
	}
	if err := c.Do(ctx, http.MethodGet, "queue", q, nil, &page); err != nil {
		return nil, err
	}
	return page.Records, nil
}

// RemoveQueueItem removes an item from the queue and the download client.
// With blocklist set, the release is blocklisted and a replacement is searched.
func (c *Client) RemoveQueueItem(ctx context.Context, id int, blocklist bool) error {
	q := url.Values{
		"removeFromClient": {"true"},
		"blocklist":        {strconv.FormatBool(blocklist)},
	}
	return c.Do(ctx, http.MethodDelete, "queue/"+strconv.Itoa(id), q, nil, nil)
}