/// Defines objects that interact with the db

package model

import (
	"database/sql"
	"git.nagee.dev/isthisnagee/diary/db"
	"strings"
)

type DiaryEntry struct {
	Id        int64  `json:"id"`
	Title     string `json:"title"`
	CreatedAt int64  `json:"created_at"`
	Version   int64  `json:"version"`
}

type App struct {
	*db.DbCtx
}

func NewApp(db_path string) (*App, error) {
	app, err := db.Init(db_path)
	if err != nil {
		return nil, err
	}
	return &App{app}, nil

}

func (app *App) NewDiaryEntry(title string) *DiaryEntry {
	var diary_entry DiaryEntry

	var result, err = app.Db.Exec("INSERT INTO diary_log (title) values (?);", title)
	if err != nil {
		panic(err)
	}

	id, err := result.LastInsertId()
	if err != nil {
		panic(err)
	}

	if err := app.Db.QueryRow(
		"SELECT id, title, created_at, version FROM diary_log where id=?",
		id,
	).Scan(&diary_entry.Id, &diary_entry.Title, &diary_entry.CreatedAt, &diary_entry.Version); err != nil {
		panic(err)
	}

	return &diary_entry
}

func (app *App) EditDiaryEntry(id int64, title string) (*DiaryEntryNote, error) {
	clean_title := strings.TrimSpace(title)
	result, err := app.Db.Exec("UPDATE diary_log set title=? where id=?", clean_title, id)
	if err != nil {
		return nil, err
	}

	num_rows_affected, err := result.RowsAffected()
	if err != nil {
		return nil, err
	}
	if num_rows_affected == 0 {
		return nil, &NotFoundError{given_id: id}
	}
	return app.GetDiaryEntryNote(id)
}

func (app *App) GetDiaryEntry(id int64) (*DiaryEntry, error) {
	var diary_entry DiaryEntry

	if err := app.Db.QueryRow(
		"SELECT id, title, created_at, version FROM diary_log where id=?",
		id,
	).Scan(&diary_entry.Id, &diary_entry.Title, &diary_entry.CreatedAt, &diary_entry.Version); err != nil {
		if err == sql.ErrNoRows {
			return nil, &NotFoundError{given_id: id}
		}
		return nil, err
	}
	return &diary_entry, nil
}

func (app *App) DeleteDiaryEntry(id int64) (bool, error) {
	result, err := app.Db.Exec("DELETE FROM diary_log where id=?", id)
	if err != nil {
		return false, err
	}

	num_rows_affected, err := result.RowsAffected()
	if err != nil {
		return false, err
	}
	if num_rows_affected == 0 {
		return false, &NotFoundError{given_id: id}
	}
	return true, nil
}

type GetDiaryEntriesQuery struct {
	/// Exclusive
	CreatedBeforeTs *int64
	/// Inclusive
	CreatedAfterTs *int64

	NumEntries *int64
}

func (app *App) GetDiaryEntries(q GetDiaryEntriesQuery) []*DiaryEntry {
	var query = "SELECT id, title, created_at, version FROM diary_log"

	var whereParams []interface{}
	if q.CreatedBeforeTs != nil {
		query += " where created_at < ?"
		whereParams = append(whereParams, *q.CreatedBeforeTs)
	}

	if q.CreatedAfterTs != nil {
		query += " and created_at >= ?"
		whereParams = append(whereParams, *q.CreatedAfterTs)
	}
	query += " ORDER BY created_at desc, id desc"
	if q.NumEntries != nil {
		query += " LIMIT ?"
		whereParams = append(whereParams, *q.NumEntries)
	}

	rows, err := app.Db.Query(
		query,
		whereParams...,
	)
	if err != nil {
		panic(err)
	}
	defer rows.Close()

	var result []*DiaryEntry
	for rows.Next() {
		var id, created_at, version int64
		var title string
		err := rows.Scan(&id, &title, &created_at, &version)
		if err != nil {
			panic(err)
		}
		result = append(result, &DiaryEntry{
			Id: id, Title: title, CreatedAt: created_at, Version: version,
		})
	}
	if err := rows.Err(); err != nil {
		panic(err)
	}

	return result
}