require "./database"

module Guff
  MIGRATIONS = [{
    id: "0-null",
    sql: %w{},
  }, {
    id: "1-create-metadata",

    sql: [%{
      CREATE TABLE metadata (
        name    TEXT PRIMARY KEY,
        value   TEXT NOT NULL
      )
    }],
  }, {
    id: "2-create-sites",

    sql: [%{
      CREATE TABLE sites (
        -- site id
        site_id     INTEGER PRIMARY KEY,

        -- name of site
        name        TEXT UNIQUE NOT NULL
                    CHECK (LENGTH(name) > 0),

        -- is this the default site?
        is_default  BOOLEAN NOT NULL DEFAULT false
      )
    }, %{
      INSERT INTO sites(name, is_default) VALUES ('Default', 1)
    }, %{
      CREATE TABLE domains (
        -- domain
        domain      TEXT PRIMARY KEY CHECK (
                      LENGTH(domain) > 0 AND
                      domain = LOWER(domain)
                    ),

        -- site id
        site_id     INTEGER NOT NULL
                    REFERENCES sites(site_id)
      )
    }],
  }, {
    id: "3-create-posts",

    sql: [%{
      CREATE TABLE post_states (
        state       INTEGER PRIMARY KEY,
        name        TEXT UNIQUE NOT NULL
      )
    }, %{
      INSERT INTO post_states(state, name) VALUES
        (0, 'draft'),
        (1, 'posted'),
        (2, 'deleted')
    }, %{
      CREATE TABLE posts (
        -- unique id
        post_id     INTEGER PRIMARY KEY,

        site_id     INTEGER NOT NULL
                    REFERENCES sites(site_id),

        state       INTEGER NOT NULL DEFAULT 0
                    REFERENCES post_states(state),

        -- when this post was created
        created_at  TIMESTAMP WITH TIME ZONE
                    NOT NULL DEFAULT CURRENT_TIMESTAMP,

        -- when this post was posted
        -- (that is, the draft status was removed)
        posted_at   TIMESTAMP WITH TIME ZONE
                    DEFAULT NULL,

        -- title of post
        name        TEXT NOT NULL
                    CHECK (LENGTH(name) > 0),

        -- slug of post (url fragment)
        slug        TEXT NOT NULL
                    CHECK (LENGTH(slug) > 0),

        -- raw body (raw text before filters)
        raw_body    TEXT NOT NULL
                    CHECK (LENGTH(raw_body) > 0),

        -- generated html (after filters)
        body        TEXT NOT NULL
                    CHECK (LENGTH(body) > 0)
      )
    }, %{
      CREATE INDEX in_posts_site_id ON posts(site_id)
    }, %{
      CREATE INDEX in_posts_slug ON posts(slug)
    }, %{
      CREATE INDEX in_posts_state ON posts(state)
    }, %{
      CREATE INDEX in_posts_posted_at ON posts(posted_at)
    }],
  }, {
    id: "4-create-tags",

    sql: [%{
      CREATE TABLE tags (
        tag_id      INTEGER PRIMARY KEY,
        name        TEXT UNIQUE NOT NULL
      )
    }, %{
      CREATE INDEX in_tags_name ON tags(name)
    }, %{
      CREATE TABLE post_tags (
        tag_id      INTEGER NOT NULL
                    REFERENCES tags(tag_id),

        post_id     INTEGER NOT NULL
                    REFERENCES posts(post_id),

        UNIQUE(tag_id, post_id)
      )
    }, %{
      CREATE INDEX in_post_tags_tag_id ON post_tags(tag_id)
    }, %{
      CREATE INDEX in_post_tags_post_id ON post_tags(post_id)
    }],
  }, {
    id: "5-sessions",

    sql: [%{
      CREATE TABLE sessions (
        session_id  TEXT PRIMARY KEY,

        created_at  TIMESTAMP WITH TIME ZONE
                    NOT NULL DEFAULT CURRENT_TIMESTAMP,

        updated_at  TIMESTAMP WITH TIME ZONE
                    NOT NULL DEFAULT CURRENT_TIMESTAMP,

        data        TEXT NOT NULL DEFAULT ''
      )
    }, %{
      CREATE INDEX in_sessions_sid on sessions(session_id)
    }],
  }]
end