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

local types = schema.types

schema.create_table("users", {
  {"id", types.integer{primary_key = true}},
  {"username", types.text{unique = true, null = false}},
  {"password_hash", types.text{null = false}},
  {"permission", types.integer{default = 0}},
  {"created_at", "INTEGER DEFAULT (unixepoch(CURRENT_TIMESTAMP))"}
})

schema.create_table("topics", {
  {"id", types.integer{primary_key = true}},
  {"name", types.text{null = false}},
  {"slug", types.text{null = false, unique = true}}
})

schema.create_table("threads", {
  {"id", types.integer{primary_key = true}},
  {"topic_id", "INTEGER REFERENCES topics(id) ON DELETE CASCADE"},
  {"user_id", "INTEGER REFERENCES users(id) ON DELETE SET NULL"},
  {"title", types.text{null = false}},
  {"slug", types.text{null = false, unique = true}},
  {"created_at", "INTEGER DEFAULT (unixepoch(CURRENT_TIMESTAMP))"},
})

schema.create_table("posts", {
  {"id", types.integer{primary_key = true}},
  {"thread_id", "INTEGER REFERENCES threads(id) ON DELETE CASCADE"},
  {"user_id", "INTEGER REFERENCES users(id) ON DELETE SET NULL"},
  {"created_at", "INTEGER DEFAULT (unixepoch(CURRENT_TIMESTAMP))"},
  {"current_revision_id", "INTEGER REFERENCES post_history(id)"},
})

schema.create_table("post_history", {
  {"id", types.integer{primary_key = true}},
  {"post_id", "INTEGER REFERENCES posts(id) ON DELETE CASCADE"},
  {"user_id", "INTEGER REFERENCES users(id) ON DELETE CASCADE"},
  {"content", types.text{null = false}},
  {"edited_at", "INTEGER DEFAULT (unixepoch(CURRENT_TIMESTAMP))"},
  {"is_initial_revision", "BOOLEAN DEFAULT FALSE"}
})

db.query("CREATE INDEX idx_threads_topic_id ON threads(topic_id)")
db.query("CREATE INDEX idx_posts_thread_id ON posts(thread_id)")
db.query("CREATE INDEX idx_post_history_post_id ON post_history(post_id)")