// Package domain contains the core value types shared across all packages
// in this module. It has zero internal imports — only the standard library.
// Every other package imports domain; domain imports nothing from this module.
package domain

import "time"

// ── Book types ────────────────────────────────────────────────────────────────

// BookMeta carries all bibliographic information about a novel.
type BookMeta struct {
	Slug          string   `json:"slug"`
	Title         string   `json:"title"`
	Author        string   `json:"author"`
	Cover         string   `json:"cover,omitempty"`
	Status        string   `json:"status,omitempty"`
	Genres        []string `json:"genres,omitempty"`
	Summary       string   `json:"summary,omitempty"`
	TotalChapters int      `json:"total_chapters,omitempty"`
	SourceURL     string   `json:"source_url"`
	Ranking       int      `json:"ranking,omitempty"`
	Rating        float64  `json:"rating,omitempty"`
}

// CatalogueEntry is a lightweight book reference returned by catalogue pages.
type CatalogueEntry struct {
	Title string `json:"title"`
	URL   string `json:"url"`
}

// ChapterRef is a reference to a single chapter returned by chapter-list pages.
type ChapterRef struct {
	Number int    `json:"number"`
	Title  string `json:"title"`
	URL    string `json:"url"`
	Volume int    `json:"volume,omitempty"`
}

// Chapter contains the fully-extracted text of a single chapter.
type Chapter struct {
	Ref  ChapterRef `json:"ref"`
	Text string     `json:"text"`
}

// RankingItem represents a single entry in the novel ranking list.
type RankingItem struct {
	Rank      int       `json:"rank"`
	Slug      string    `json:"slug"`
	Title     string    `json:"title"`
	Author    string    `json:"author,omitempty"`
	Cover     string    `json:"cover,omitempty"`
	Status    string    `json:"status,omitempty"`
	Genres    []string  `json:"genres,omitempty"`
	SourceURL string    `json:"source_url,omitempty"`
	Updated   time.Time `json:"updated,omitempty"`
}

// ── Storage record types ──────────────────────────────────────────────────────

// ChapterInfo is a lightweight chapter descriptor stored in the index.
type ChapterInfo struct {
	Number int    `json:"number"`
	Title  string `json:"title"`
	Date   string `json:"date,omitempty"`
}

// ReadingProgress holds a single user's reading position for one book.
type ReadingProgress struct {
	Slug      string    `json:"slug"`
	Chapter   int       `json:"chapter"`
	UpdatedAt time.Time `json:"updated_at"`
}

// ── Task record types ─────────────────────────────────────────────────────────

// TaskStatus enumerates the lifecycle states of any task.
type TaskStatus string

const (
	TaskStatusPending   TaskStatus = "pending"
	TaskStatusRunning   TaskStatus = "running"
	TaskStatusDone      TaskStatus = "done"
	TaskStatusFailed    TaskStatus = "failed"
	TaskStatusCancelled TaskStatus = "cancelled"
)

// ScrapeTask represents a book-scraping job stored in PocketBase.
type ScrapeTask struct {
	ID              string     `json:"id"`
	Kind            string     `json:"kind"`       // "catalogue" | "book" | "book_range"
	TargetURL       string     `json:"target_url"` // non-empty for single-book tasks
	FromChapter     int        `json:"from_chapter,omitempty"`
	ToChapter       int        `json:"to_chapter,omitempty"`
	WorkerID        string     `json:"worker_id,omitempty"`
	Status          TaskStatus `json:"status"`
	BooksFound      int        `json:"books_found"`
	ChaptersScraped int        `json:"chapters_scraped"`
	ChaptersSkipped int        `json:"chapters_skipped"`
	Errors          int        `json:"errors"`
	Started         time.Time  `json:"started"`
	Finished        time.Time  `json:"finished,omitempty"`
	ErrorMessage    string     `json:"error_message,omitempty"`
}

// ScrapeResult is the outcome reported by the runner after finishing a ScrapeTask.
type ScrapeResult struct {
	BooksFound      int    `json:"books_found"`
	ChaptersScraped int    `json:"chapters_scraped"`
	ChaptersSkipped int    `json:"chapters_skipped"`
	Errors          int    `json:"errors"`
	ErrorMessage    string `json:"error_message,omitempty"`
}

// AudioTask represents an audio-generation job stored in PocketBase.
type AudioTask struct {
	ID           string     `json:"id"`
	CacheKey     string     `json:"cache_key"` // "slug/chapter/voice"
	Slug         string     `json:"slug"`
	Chapter      int        `json:"chapter"`
	Voice        string     `json:"voice"`
	WorkerID     string     `json:"worker_id,omitempty"`
	Status       TaskStatus `json:"status"`
	ErrorMessage string     `json:"error_message,omitempty"`
	Started      time.Time  `json:"started"`
	Finished     time.Time  `json:"finished,omitempty"`
}

// AudioResult is the outcome reported by the runner after finishing an AudioTask.
type AudioResult struct {
	ObjectKey    string `json:"object_key,omitempty"`
	ErrorMessage string `json:"error_message,omitempty"`
}