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package native

import (
"github.com/ziutek/mymysql/mysql"
"log"
)

type Stmt struct {
my *Conn

id uint32
sql string // For reprepare during reconnect

params []*paramValue // Parameters binding
rebind bool
binded bool

fields []*mysql.Field
fc_map map[string]int // Maps field name to column number

field_count int
param_count int
warning_count int
status uint16
}

// Returns index for given name or -1 if field of that name doesn't exist
func (res *Stmt) Map(field_name string) int {
if fi, ok := res.fc_map[field_name]; ok {
return fi
}
return -1
}

func (stmt *Stmt) NumField() int {
return stmt.field_count
}

func (stmt *Stmt) NumParam() int {
return stmt.param_count
}

func (stmt *Stmt) WarnCount() int {
return stmt.warning_count
}

func (stmt *Stmt) sendCmdExec() {
// Calculate packet length and NULL bitmap
null_bitmap := make([]byte, (stmt.param_count+7)>>3)
pkt_len := 1 + 4 + 1 + 4 + 1 + len(null_bitmap)
for ii, param := range stmt.params {
par_len := param.Len()
pkt_len += par_len
if par_len == 0 {
null_byte := ii >> 3
null_mask := byte(1) << uint(ii-(null_byte<<3))
null_bitmap[null_byte] |= null_mask
}
}
if stmt.rebind {
pkt_len += stmt.param_count * 2
}
// Reset sequence number
stmt.my.seq = 0
// Packet sending
pw := stmt.my.newPktWriter(pkt_len)
writeByte(pw, _COM_STMT_EXECUTE)
writeU32(pw, stmt.id)
writeByte(pw, 0) // flags = CURSOR_TYPE_NO_CURSOR
writeU32(pw, 1) // iteration_count
write(pw, null_bitmap)
if stmt.rebind {
writeByte(pw, 1)
// Types
for _, param := range stmt.params {
writeU16(pw, param.typ)
}
} else {
writeByte(pw, 0)
}
// Values
for _, param := range stmt.params {
writeValue(pw, param)
}

if stmt.my.Debug {
log.Printf("[%2d <-] Exec command packet: len=%d, null_bitmap=%v, rebind=%t",
stmt.my.seq-1, pkt_len, null_bitmap, stmt.rebind)
}

// Mark that we sended information about binded types
stmt.rebind = false
}

func (my *Conn) getPrepareResult(stmt *Stmt) interface{} {
loop:
pr := my.newPktReader() // New reader for next packet
pkt0 := readByte(pr)

//log.Println("pkt0:", pkt0, "stmt:", stmt)

if pkt0 == 255 {
// Error packet
my.getErrorPacket(pr)
}

if stmt == nil {
if pkt0 == 0 {
// OK packet
return my.getPrepareOkPacket(pr)
}
} else {
unreaded_params := (stmt.param_count < len(stmt.params))
switch {
case pkt0 == 254:
// EOF packet
stmt.warning_count, stmt.status = my.getEofPacket(pr)
stmt.my.status = stmt.status
return stmt

case pkt0 > 0 && pkt0 < 251 && (stmt.field_count < len(stmt.fields) ||
unreaded_params):
// Field packet
if unreaded_params {
// Read and ignore parameter field. Sentence from MySQL source:
/* skip parameters data: we don't support it yet */
my.getFieldPacket(pr)
// Increment field count
stmt.param_count++
} else {
field := my.getFieldPacket(pr)
stmt.fields[stmt.field_count] = field
stmt.fc_map[field.Name] = stmt.field_count
// Increment field count
stmt.field_count++
}
// Read next packet
goto loop
}
}
panic(UNK_RESULT_PKT_ERROR)
}

func (my *Conn) getPrepareOkPacket(pr *pktReader) (stmt *Stmt) {
if my.Debug {
log.Printf("[%2d ->] Perpared OK packet:", my.seq-1)
}

stmt = new(Stmt)
stmt.my = my
// First byte was readed by getPrepRes
stmt.id = readU32(pr)
stmt.fields = make([]*mysql.Field, int(readU16(pr))) // FieldCount
stmt.params = make([]*paramValue, int(readU16(pr))) // ParamCount
read(pr, 1)
stmt.warning_count = int(readU16(pr))
pr.checkEof()

// Make field map if fields exists.
if len(stmt.fields) > 0 {
stmt.fc_map = make(map[string]int)
}
if my.Debug {
log.Printf(tab8s+"ID=0x%x ParamCount=%d FieldsCount=%d WarnCount=%d",
stmt.id, len(stmt.params), len(stmt.fields), stmt.warning_count,
)
}
return
}
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