package datamaps

import (
	"database/sql"
	"fmt"
	"log"
	"path/filepath"

	"github.com/tealeg/xlsx/v3"

	// Needed for the sqlite3 driver
	_ "github.com/mattn/go-sqlite3"
)

func ExportMaster(opts *Options) error {
	// A master represents a set of file data from the database. Actually, in terms of the database,
	// it should represent a "return".
	//
	// The meat of the master is of the format:
	//		Key	1 | Key_1_Value_for_FD_1 | Key_1_Value_for_FD_2 | Key_1_Value_for_FD_3 | ... etc
	//		Key 2 | Key_2_Value_for_FD_1 | Key_2_Value_for_FD_2 | Key_2_Value_for_FD_3 | ... etc
	//		Key 3 | Key_3_Value_for_FD_1 | Key_3_Value_for_FD_2 | Key_3_Value_for_FD_3 | ... etc
	//		...
	// Could be represented as a slice or a map[string][]string
	// SQL statement:
	//
	// SELECT datamap_line.key, return_data.value, return_data.filename
	//                                    FROM (((return_data
	//                                    INNER JOIN datamap_line ON return_data.dml_id=datamap_line.id)
	//                                    INNER JOIN datamap ON datamap_line.dm_id=datamap.id)
	//                                    INNER JOIN return on return_data.ret_id=return.id)
	//                                    WHERE datamap.name="Tonk 1" AND return.name="Hunkers";

	// filename := filepath.Join(opts.MasterOutPutPath, "master.xlsx")

	// a test key
	targetKey := "A Rabbit"

	wb := xlsx.NewFile()
	sh, err := wb.AddSheet("Master Data")

	testRow, err := sh.Row(1)
	if err != nil {
		log.Fatal(err)
	}

	// SQLITE CODE

	db, err := sql.Open("sqlite3", opts.DBPath)

	sqlCount := `SELECT count(return_data.id)
                                          FROM (((return_data
                                          INNER JOIN datamap_line ON return_data.dml_id=datamap_line.id)
                                          INNER JOIN datamap ON datamap_line.dm_id=datamap.id)
                                          INNER JOIN return on return_data.ret_id=return.id)
                                          WHERE datamap.name=? AND return.name=? AND datamap_line.key=?
                                          GROUP BY datamap_line.key;`

	rowCountStmt, err := db.Prepare(sqlCount)
	if err != nil {
		return err
	}
	defer rowCountStmt.Close()

	var rowCount int64

	_ = rowCountStmt.QueryRow(opts.DMName, opts.ReturnName, targetKey).Scan(&rowCount)
	fmt.Println(rowCount)

	_ = `SELECT datamap_line.key, return_data.value, return_data.filename
                                          FROM (((return_data
                                          INNER JOIN datamap_line ON return_data.dml_id=datamap_line.id) 
                                          INNER JOIN datamap ON datamap_line.dm_id=datamap.id) 
                                          INNER JOIN return on return_data.ret_id=return.id) 
                                          WHERE datamap.name=? AND return.name=? AND datamap_line.key=?;`

	if sl := testRow.WriteSlice([]string{"Hello", "Bollocks", "Knackers", "Bottyies"}, -1); sl == -1 {
		log.Printf("not a slice type")
	}
	log.Printf("writing slice to row\n")

	log.Printf("saving master at %s", opts.MasterOutPutPath)
	if err := wb.Save(filepath.Join(opts.MasterOutPutPath, "master.xlsx")); err != nil {
		log.Fatalf("cannot save file to %s", opts.MasterOutPutPath)
	}
	sh.Close()
	return nil
}