-- +goose Up
-- +goose StatementBegin
CREATE TABLE images(
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    subreddit VARCHAR(255) NOT NULL COLLATE NOCASE,
    device VARCHAR(250) NOT NULL COLLATE NOCASE,
    post_title VARCHAR(255) NOT NULL,
    post_name VARCHAR(255) NOT NULL,
    post_url VARCHAR(255) NOT NULL,
    post_created BIGINT NOT NULL DEFAULT CURRENT_TIMESTAMP,
    post_author VARCHAR(50) NOT NULL,
    post_author_url VARCHAR(255) NOT NULL,
    image_relative_path VARCHAR(255) NOT NULL,
    image_original_url VARCHAR(255) NOT NULL,
    image_height BIGINT NOT NULL DEFAULT 0,
    image_width BIGINT NOT NULL DEFAULT 0,
    image_size BIGINT NOT NULL DEFAULT 0,
    thumbnail_relative_path VARCHAR(255) NOT NULL DEFAULT '',
    nsfw TINYINT NOT NULL DEFAULT 0,
    blacklisted TINYINT NOT NULL DEFAULT 0,
    created_at BIGINT NOT NULL DEFAULT (strftime('%s', 'now')),
    updated_at BIGINT NOT NULL DEFAULT (strftime('%s', 'now')),
    CONSTRAINT fk_image_subreddit
        FOREIGN KEY (subreddit)
        REFERENCES subreddits(name)
        ON DELETE CASCADE,
    CONSTRAINT fk_image_devices_slug
        FOREIGN KEY (device)
        REFERENCES devices(slug)
        ON DELETE CASCADE,
    CONSTRAINT fk_image_subreddit_cover
        FOREIGN KEY (id)
        REFERENCES subreddits(cover_image_id)
);

CREATE VIRTUAL TABLE images_fts5 USING fts5(
    post_author,
    post_title,
    post_name,
    image_relative_path,
    post_url,
    post_author_url,
    content='images',
    content_rowid='id'
);

CREATE INDEX idx_subreddit_images_blacklisted ON images(subreddit, blacklisted);
CREATE INDEX idx_subreddit_device_images_blacklisted ON images(device, subreddit, blacklisted);
CREATE INDEX idx_images_nsfw_blacklisted ON images(nsfw, blacklisted);
CREATE INDEX idx_images_created_at_nsfw_blacklisted ON images(created_at DESC, nsfw, blacklisted);
CREATE INDEX idx_images_blacklisted ON images(blacklisted);
CREATE UNIQUE INDEX idx_unique_images_per_device ON images(device, post_name);

CREATE TRIGGER images_update_timestamp AFTER UPDATE ON images FOR EACH ROW
BEGIN
    UPDATE images SET updated_at = strftime('%s', 'now') WHERE id = old.id;
END;

CREATE TRIGGER images_update_subreddit_cover_on_insert AFTER INSERT ON images FOR EACH ROW
BEGIN
    UPDATE subreddits SET cover_image_id = new.id WHERE name = new.subreddit AND cover_image_id IS NULL;
END;

CREATE TRIGGER images_update_subreddit_cover_on_delete AFTER DELETE ON images FOR EACH ROW
BEGIN
    UPDATE subreddits SET cover_image_id = NULL WHERE cover_image_id = old.id;
END;

CREATE TRIGGER images_update_fts_insert AFTER INSERT ON images FOR EACH ROW
BEGIN
    INSERT INTO images_fts5(
        rowid, post_author, post_title, post_name, image_relative_path, post_url, post_author_url
    ) VALUES(
        new.id, new.post_author, new.post_title, new.post_name, new.image_relative_path, new.post_url, new.post_author_url
    ); 
END;

CREATE TRIGGER images_update_fts_delete AFTER DELETE ON images FOR EACH ROW
BEGIN
    DELETE FROM images_fts5 WHERE rowid = old.id;
END;
    
-- +goose StatementEnd

-- +goose Down
-- +goose StatementBegin
DROP TABLE images_fts5;
DROP TABLE images;
-- +goose StatementEnd