package dbreads

// The reads route's 200 body is newline-delimited JSON, one Line per line
// (spec §5.5 step 6). MaxLineBytes bounds one line: a ChunkBytes chunk,
// sealed and base64-encoded, is about 350 KiB, and a pull's PullChunkBytes
// chunk about 1.4 MB.
const MaxLineBytes = 2 << 20

// Wait lines name what the console is waiting on; ended lines say why the
// response ends without a result.
const (
	WaitPickup     = "pickup"
	WaitReading    = "reading"
	EndedNotPicked = "not-picked" // the CLI says DBF-3
	EndedNoResult  = "no-result"  // the CLI says DBF-12
)

// Line is one outcome: admitted (the read's id), picked (the owner box),
// one chunk in sequence, a wait, an ended, or the result, which comes last.
// The ended line is additive to spec §5.5's list ("from here every outcome
// is a line in that body"): it lets the CLI tell nobody picking the read
// (DBF-3) from a read that did not finish (DBF-12), which a console restart
// or a dropped connection also ends with no result.
type Line struct {
	Admitted string  `json:"admitted,omitempty"`
	Picked   string  `json:"picked,omitempty"`
	Chunk    int64   `json:"chunk,omitempty"`
	Data     []byte  `json:"data,omitempty"`
	Wait     string  `json:"wait,omitempty"`
	Ended    string  `json:"ended,omitempty"`
	Result   *Result `json:"result,omitempty"`
}

// ReadBody is the POST …/db/{host}/reads body (spec §5.5 step 2).
type ReadBody struct {
	Op       string `json:"op"`
	SQL      string `json:"sql"`
	At       string `json:"at"`
	ReplyKey string `json:"reply_key"`
}