-- +goose Up
-- gen_random_uuid() is built-in since PostgreSQL 13, no extension needed

-- Admin authentication (single row)
CREATE TABLE admin (
	id              SERIAL PRIMARY KEY,
	password_hash   BYTEA,  -- NULL until first login() sets password
	created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- Insert the single admin row
INSERT INTO admin (id) VALUES (1);

-- Sessions for admin authentication
CREATE TABLE session (
	id              BIGSERIAL PRIMARY KEY,
	session_id      TEXT NOT NULL UNIQUE,
	created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
	expires_at      TIMESTAMPTZ NOT NULL
);

CREATE INDEX idx_session_expires_at ON session(expires_at);

-- Items (the main content)
CREATE TABLE item (
	id              BIGSERIAL PRIMARY KEY,
	pub_id          UUID NOT NULL DEFAULT gen_random_uuid() UNIQUE,
	title           TEXT,
	description     TEXT,
	link_url        TEXT,                   -- Source URL (optional)
	item_type       TEXT NOT NULL,          -- 'image', 'video', 'quote', 'embed'
	embed_provider  TEXT,                   -- 'youtube', 'vimeo', NULL
	embed_video_id  TEXT,                   -- Video ID for embeds
	embed_html      TEXT,                   -- Cached embed iframe HTML
	created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
	deleted_at      TIMESTAMPTZ             -- Soft delete
);

CREATE INDEX idx_item_deleted ON item(deleted_at);
CREATE INDEX idx_item_created ON item(created_at DESC);
CREATE INDEX idx_item_pub_id ON item(pub_id);

-- Media blobs (stored in DB)
CREATE TABLE media (
	id              BIGSERIAL PRIMARY KEY,
	item_id         BIGINT NOT NULL REFERENCES item(id) ON DELETE CASCADE,
	media_type      TEXT NOT NULL,          -- 'original', 'thumbnail'
	content_type    TEXT NOT NULL,          -- MIME type
	data            BYTEA NOT NULL,
	width           INT,
	height          INT,
	created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX idx_media_item_id ON media(item_id);

-- Tags
CREATE TABLE tag (
	id              BIGSERIAL PRIMARY KEY,
	name            TEXT NOT NULL UNIQUE
);

CREATE INDEX idx_tag_name ON tag(name);

-- Item-Tag junction
CREATE TABLE item_tag (
	item_id         BIGINT NOT NULL REFERENCES item(id) ON DELETE CASCADE,
	tag_id          BIGINT NOT NULL REFERENCES tag(id) ON DELETE CASCADE,
	PRIMARY KEY (item_id, tag_id)
);

CREATE INDEX idx_item_tag_tag_id ON item_tag(tag_id);

-- +goose Down
DROP TABLE IF EXISTS item_tag;
DROP TABLE IF EXISTS tag;
DROP TABLE IF EXISTS media;
DROP TABLE IF EXISTS item;
DROP TABLE IF EXISTS session;
DROP TABLE IF EXISTS admin;