local db = require("lapis.db")
local schema = require("lapis.db.schema")
local types = schema.types

return {
  [1] = function ()
    schema.create_table("sessions", {
      {"id", types.integer{primary_key = true}},
      {"key", types.text{unique = true}},
      {"user_id", "INTEGER REFERENCES users(id) ON DELETE CASCADE"},
      {"expires_at", types.integer},
      {"created_at", "INTEGER DEFAULT (unixepoch(CURRENT_TIMESTAMP))"},
    })

    db.query("CREATE INDEX sessions_user_id ON sessions(user_id)")
    db.query("CREATE INDEX session_keys ON sessions(key)")
  end,

  [2] = function ()
    schema.add_column("users", "confirmed_on", types.integer{null = true})
  end,

  [3] = function ()
    schema.add_column("users", "status", types.text{null = true, default=""})
    schema.create_table("avatars", {
      {"id", types.integer{primary_key = true}},
      {"file_path", types.text{unique = true}},
      {"uploaded_at", "INTEGER DEFAULT (unixepoch(CURRENT_TIMESTAMP))"},
    })
    schema.add_column("users", "avatar_id", "REFERENCES avatars(id) ON DELETE SET NULL")
  end,

  [4] = function ()
    schema.add_column("topics", "description", types.text{default=""})

    -- topic locked = no new threads can be created in the topic, but posts can be made in threads
    -- thread locked = no new posts can be created in the thread, existing posts can not be edited
    -- admins bypass both restrictions
    schema.add_column("topics", "is_locked", "BOOLEAN DEFAULT FALSE")
    schema.add_column("threads", "is_locked", "BOOLEAN DEFAULT FALSE")
    -- will appear on top of non-stickied threads in topic view
    schema.add_column("threads", "is_stickied", "BOOLEAN DEFAULT FALSE")
  end,
  
  [5] = function ()
    db.query("CREATE INDEX idx_posts_thread ON posts(thread_id, created_at, id)")
    db.query("CREATE INDEX idx_users_avatar ON users(avatar_id)")
    db.query("CREATE INDEX idx_topics_slug ON topics(slug)")
    db.query("CREATE INDEX idx_threads_slug ON threads(slug)")
  end,
  
  [6] = function ()
    schema.drop_column("post_history", "user_id")
  end,
  
  [7] = function ()
    db.query('DROP INDEX "idx_users_avatar"')
    schema.drop_column("users", "avatar_id")
    schema.add_column("users", "avatar_id", "REFERENCES avatars(id) DEFAULT 1")
  end,
  
  [8] = function ()
    schema.add_column("topics", "sort_order", types.integer{default = 0})
    db.query("UPDATE topics SET sort_order = (SELECT COUNT(*) FROM topics t2 WHERE t2.ROWID <= topics.ROWID)")
  end,
  
  [9] = function ()
    schema.add_column("post_history", "original_markup", types.text{null = false})
    schema.add_column("post_history", "markup_language", types.text{default = "babycode"})
  end,
  
  [10] = function ()
    schema.add_column("users", "signature_original_markup", types.text{default = ""})
    schema.add_column("users", "signature_rendered", types.text{default = ""})
  end,
}