//
//  WRReaderViewController.h
//  WeRead (微信读书)
//
//  Reverse-engineered header reconstruction.
//  Main reader controller. Manages reading state, progress saving,
//  chapter jumping, page rendering lifecycle, and the typesetter.
//  431 methods total — this header exposes the key public interface.
//

#import <UIKit/UIKit.h>
#import "WRPageViewController.h"

@class WRBook;
@class WRChapterData;
@class WRChapterPageCount;
@class WRPageView;
@class WRReadingProgress;

NS_ASSUME_NONNULL_BEGIN

// ============================================================================
#pragma mark - Reading Progress Data
// ============================================================================

/// Encapsulates the current reading position.
@interface WRReadingProgress : NSObject

@property (nonatomic, copy, nullable) NSString *bookId;
@property (nonatomic, assign) NSUInteger chapterIndex;   // Current chapter (0-based).
@property (nonatomic, assign) NSUInteger pageIndex;      // Page within chapter (0-based).
@property (nonatomic, assign) NSUInteger charIndex;      // Character offset within chapter.
@property (nonatomic, assign) CGFloat scrollOffset;      // For scroll-based reading.
@property (nonatomic, copy, nullable) NSString *chapterId;
@property (nonatomic, assign) double readPercentage;     // 0.0 .. 1.0.

@end

// ============================================================================
#pragma mark - WRReaderViewControllerDelegate
// ============================================================================

@protocol WRReaderViewControllerDelegate <NSObject>
@optional

/// Called when the reading progress changes (page flip, chapter jump).
- (void)readerViewController:(WRReaderViewController *)readerVC
         didUpdateProgress:(WRReadingProgress *)progress;

/// Called when the reader needs to present a modal (e.g., settings, TOC).
- (void)readerViewController:(WRReaderViewController *)readerVC
       presentViewController:(UIViewController *)viewController
                   animated:(BOOL)animated
                 completion:(void (^ __nullable)(void))completion;

/// Called when the reader exits.
- (void)readerViewControllerDidClose:(WRReaderViewController *)readerVC;

@end

// ============================================================================
#pragma mark - WRReaderViewController
// ============================================================================

@interface WRReaderViewController : UIViewController <WRPageViewControllerDelegate>

// ---- Delegate ----
@property (nonatomic, weak, nullable) id<WRReaderViewControllerDelegate> readerDelegate;

// ---- Book & Progress ----
/// The book being read.
@property (nonatomic, strong, readonly, nullable) WRBook *book;

/// The book identifier (convenience accessor).
@property (nonatomic, copy, readonly, nullable) NSString *bookId;

/// Current reading progress.
@property (nonatomic, strong, nullable) WRReadingProgress *readingProgress;

// ---- Chapter State ----
/// The chapter data for the currently loaded chapter.
@property (nonatomic, strong, nullable) WRChapterData *currentChapterData;

/// The page count calculator for the current chapter.
@property (nonatomic, strong, nullable) WRChapterPageCount *currentChapterPageCount;

/// The total number of chapters in the book.
@property (nonatomic, assign, readonly) NSUInteger totalChapters;

// ---- Reader Mode ----
/// Whether the reader is in doodle/drawing mode (for handwritten notes).
@property (nonatomic, assign, readonly) BOOL doodleMode;

/// Whether auto-read is active.
@property (nonatomic, assign, readonly) BOOL autoReadEnabled;

// ---- Typesetter ----
/// Whether the typesetter is currently recomposing (re-layout).
@property (nonatomic, assign, readonly) BOOL isRecomposing;

// ============================================================================
#pragma mark - Initialization
// ============================================================================

/// Full initialization with all options.
/// @param book               The book model object.
/// @param progress           Initial reading progress.
/// @param forceUseInitialProgress  If YES, ignore any saved progress and use the given one.
/// @param doodleMode         Start in doodle mode.
/// @param autoRead           Start with auto-read enabled.
- (instancetype)initWithBook:(WRBook *)book
                    progress:(WRReadingProgress * __nullable)progress
      forceUseInitialProgress:(BOOL)forceUseInitialProgress
                  doodleMode:(BOOL)doodleMode
                    autoRead:(BOOL)autoRead;

/// Convenience init with just a book ID (loads book data from cache/server).
- (instancetype)initWithBookId:(NSString *)bookId;

// ============================================================================
#pragma mark - Lifecycle
// ============================================================================

- (void)viewDidLoad;

// ============================================================================
#pragma mark - Page Rendering
// ============================================================================

/// Renders the page view for the given progress data. This is the main
/// entry point for displaying a page:
///   1. Retrieves or computes the chapter data.
///   2. Computes pagination for the current page size and typesetter settings.
///   3. Creates/updates the WRPageView with the layout frame for the page range.
///   4. Updates the page view controller's child.
///
/// @param pageView     The page view to render into.
/// @param progressData The reading progress (chapter + page index).
/// @param source       A string identifying the caller (for logging).
- (void)renderPageView:(WRPageView *)pageView
          progressData:(WRReadingProgress *)progressData
                source:(NSString *)source;

/// Recomposes (re-typesets) the current page view.
/// Called after font size, line spacing, or theme changes.
/// @param source A string identifying the caller.
- (void)recomposeCurrentPageViewWithSource:(NSString *)source;

/// Reloads all page views with new progress data.
/// Called after a full chapter change or settings change.
/// @param progressData The new reading progress.
/// @param source       A string identifying the caller.
- (void)reloadPageViewsWithProgressData:(WRReadingProgress *)progressData
                                 source:(NSString *)source;

// ============================================================================
#pragma mark - Chapter Navigation
// ============================================================================

/// Jumps to a specific chapter and position.
/// @param chapterIdx     The chapter index (0-based).
/// @param position       The page index within the chapter.
/// @param positionOfFile The character offset within the chapter (for precise positioning).
- (void)gotoChapterIdx:(NSUInteger)chapterIdx
              position:(NSUInteger)position
       positionOfFile:(NSUInteger)positionOfFile;

/// Advances to the next chapter. Resets page index to 0.
- (void)jumpReadingToNextChapter;

/// Goes back to the previous chapter. Sets page index to the last page.
- (void)jumpReadingToPreChapter;

// ============================================================================
#pragma mark - Page Flip Callback
// ============================================================================

/// Called by WRPageViewController when a page flip completes.
/// Updates progress, saves state, and triggers prefetching of adjacent chapters.
- (void)didFlipPage;

// ============================================================================
#pragma mark - Progress Persistence
// ============================================================================

/// Saves the current reading progress.
/// @param isAsync If YES, save asynchronously (non-blocking). If NO, save synchronously.
- (void)_saveReadingProgressAndIsAsync:(BOOL)isAsync;

// ============================================================================
#pragma mark - Typesetter
// ============================================================================

/// Modifies the typesetter attributes (font, size, spacing, etc.) and
/// triggers a full re-typeset.
/// @param block A block that receives a mutable dictionary of typesetter
///              attributes and modifies them in place.
- (void)changeTypesetterAttributesWithBlock:(void (^ __nonnull)(NSMutableDictionary *attrs))block;

// ============================================================================
#pragma mark - Pagination
// ============================================================================

/// Initializes or re-initializes the chapter page count calculator.
/// Called when the chapter changes, the view size changes, or typesetter
/// settings change.
- (void)initChapterPageCount;

@end

NS_ASSUME_NONNULL_END