-- V12: Book Management Schema
-- Adds comprehensive book metadata tracking, authors, and identifiers

-- Book metadata (supplements media_items for EPUB/PDF/MOBI)
CREATE TABLE book_metadata (
    media_id TEXT PRIMARY KEY REFERENCES media_items(id) ON DELETE CASCADE,
    isbn TEXT,
    isbn13 TEXT,              -- Normalized ISBN-13 for lookups
    publisher TEXT,
    language TEXT,            -- ISO 639-1 code
    page_count INTEGER,
    publication_date TEXT,    -- ISO 8601 date string
    series_name TEXT,
    series_index REAL,        -- Supports 1.5, etc.
    format TEXT,              -- 'epub', 'pdf', 'mobi', 'azw3'
    created_at TEXT NOT NULL DEFAULT (datetime('now')),
    updated_at TEXT NOT NULL DEFAULT (datetime('now'))
) STRICT;

CREATE INDEX idx_book_isbn13 ON book_metadata(isbn13);
CREATE INDEX idx_book_series ON book_metadata(series_name, series_index);
CREATE INDEX idx_book_publisher ON book_metadata(publisher);
CREATE INDEX idx_book_language ON book_metadata(language);

-- Multiple authors per book (many-to-many)
CREATE TABLE book_authors (
    media_id TEXT NOT NULL REFERENCES media_items(id) ON DELETE CASCADE,
    author_name TEXT NOT NULL,
    author_sort TEXT,         -- "Last, First" for sorting
    role TEXT NOT NULL DEFAULT 'author', -- author, translator, editor, illustrator
    position INTEGER NOT NULL DEFAULT 0,
    PRIMARY KEY (media_id, author_name, role)
) STRICT;

CREATE INDEX idx_book_authors_name ON book_authors(author_name);
CREATE INDEX idx_book_authors_sort ON book_authors(author_sort);

-- Multiple identifiers (ISBN variants, ASIN, DOI, etc.)
CREATE TABLE book_identifiers (
    media_id TEXT NOT NULL REFERENCES media_items(id) ON DELETE CASCADE,
    identifier_type TEXT NOT NULL,  -- isbn, isbn13, asin, doi, lccn, oclc
    identifier_value TEXT NOT NULL,
    PRIMARY KEY (media_id, identifier_type, identifier_value)
) STRICT;

CREATE INDEX idx_book_identifiers ON book_identifiers(identifier_type, identifier_value);

-- Trigger to update updated_at on book_metadata changes
CREATE TRIGGER update_book_metadata_timestamp
    AFTER UPDATE ON book_metadata
    FOR EACH ROW
BEGIN
    UPDATE book_metadata SET updated_at = datetime('now') WHERE media_id = NEW.media_id;
END;