package fic

import (
	"database/sql"
	"fmt"
	"time"
)

type Team struct {
	Id          int64  `json:"id"`
	InitialName string `json:"initialName"`
	Name        string `json:"name"`
	Color       uint32 `json:"color"`
}

func GetTeams() ([]Team, error) {
	if rows, err := DBQuery("SELECT id_team, initial_name, name, color FROM teams"); err != nil {
		return nil, err
	} else {
		defer rows.Close()

		var teams = make([]Team, 0)
		for rows.Next() {
			var t Team
			if err := rows.Scan(&t.Id, &t.InitialName, &t.Name, &t.Color); err != nil {
				return nil, err
			}
			teams = append(teams, t)
		}
		if err := rows.Err(); err != nil {
			return nil, err
		}

		return teams, nil
	}
}

func GetTeam(id int) (Team, error) {
	var t Team
	if err := DBQueryRow("SELECT id_team, initial_name, name, color FROM teams WHERE id_team = ?", id).Scan(&t.Id, &t.InitialName, &t.Name, &t.Color); err != nil {
		return t, err
	}

	return t, nil
}

func GetTeamByInitialName(initialName string) (Team, error) {
	var t Team
	if err := DBQueryRow("SELECT id_team, initial_name, name, color FROM teams WHERE initial_name = ?", initialName).Scan(&t.Id, &t.InitialName, &t.Name, &t.Color); err != nil {
		return t, err
	}

	return t, nil
}

func CreateTeam(name string, color uint32) (Team, error) {
	if res, err := DBExec("INSERT INTO teams (initial_name, name, color) VALUES (?, ?, ?)", name, name, color); err != nil {
		return Team{}, err
	} else if tid, err := res.LastInsertId(); err != nil {
		return Team{}, err
	} else {
		return Team{tid, name, name, color}, nil
	}
}

func (t Team) Update() (int64, error) {
	if res, err := DBExec("UPDATE teams SET name = ?, color = ? WHERE id_team = ?", t.Name, t.Color, t.Id); err != nil {
		return 0, err
	} else if nb, err := res.RowsAffected(); err != nil {
		return 0, err
	} else {
		return nb, err
	}
}

func (t Team) Delete() (int64, error) {
	if res, err := DBExec("DELETE FROM team_members WHERE id_team = ?; DELETE FROM teams WHERE id_team = ?", t.Id, t.Id); err != nil {
		return 0, err
	} else if nb, err := res.RowsAffected(); err != nil {
		return 0, err
	} else {
		return nb, err
	}
}

func (t Team) GetPoints() (int64, error) {
	var nb *int64
	err := DBQueryRow("SELECT SUM(E.gain) FROM exercice_solved S INNER JOIN exercices E ON E.id_exercice = S.id_exercice WHERE id_team = ?", t.Id).Scan(&nb)
	if nb != nil {
		return *nb, err
	} else {
		return 0, err
	}
}

func GetRank() (map[int64]int, error) {
	if rows, err := DBQuery("SELECT id_team, SUM(E.gain) AS score, MAX(S.time) FROM exercice_solved S INNER JOIN exercices E ON E.id_exercice = S.id_exercice GROUP BY id_team HAVING score > 0 ORDER BY score DESC, time ASC"); err != nil {
		return nil, err
	} else {
		defer rows.Close()

		rank := map[int64]int{}
		nteam := 0
		for rows.Next() {
			nteam += 1
			var tid int64
			var score int64
			var tzzz time.Time
			if err := rows.Scan(&tid, &score, &tzzz); err != nil {
				return nil, err
			}
			rank[tid] = nteam
		}
		if err := rows.Err(); err != nil {
			return nil, err
		}

		return rank, nil
	}
}

func GetTryRank() ([]int64, error) {
	if rows, err := DBQuery("SELECT id_team, COUNT(*) AS score FROM exercice_tries GROUP BY id_team HAVING score > 0 ORDER BY score DESC"); err != nil {
		return nil, err
	} else {
		defer rows.Close()

		rank := make([]int64, 0)
		for rows.Next() {
			var tid int64
			var score int64
			if err := rows.Scan(&tid, &score); err != nil {
				return nil, err
			}
			rank = append(rank, tid)
		}
		if err := rows.Err(); err != nil {
			return nil, err
		}

		return rank, nil
	}
}

func (t Team) HasAccess(e Exercice) bool {
	if e.Depend == nil {
		return true
	} else {
		ed := Exercice{}
		ed.Id = *e.Depend
		s, _, _ := t.HasSolved(ed)
		return s
	}
}

func NbTry(t *Team, e Exercice) int {
	var cnt *int

	if t != nil {
		DBQueryRow("SELECT COUNT(*) FROM exercice_tries WHERE id_team = ? AND id_exercice = ?", t.Id, e.Id).Scan(&cnt)
	} else {
		DBQueryRow("SELECT COUNT(*) FROM exercice_tries WHERE id_exercice = ?", e.Id).Scan(&cnt)
	}

	if cnt == nil {
		return 0
	} else {
		return *cnt
	}
}

func GetTries(t *Team, e *Exercice) ([]time.Time, error) {
	var rows *sql.Rows
	var err error

	if t == nil {
		if e == nil {
			rows, err = DBQuery("SELECT time FROM exercice_tries ORDER BY time ASC")
		} else {
			rows, err = DBQuery("SELECT time FROM exercice_tries WHERE id_exercice = ? ORDER BY time ASC", e.Id)
		}
	} else {
		if e == nil {
			rows, err = DBQuery("SELECT time FROM exercice_tries WHERE id_team = ? ORDER BY time ASC", t.Id)
		} else {
			rows, err = DBQuery("SELECT time FROM exercice_tries WHERE id_team = ? AND id_exercice = ? ORDER BY time ASC", t.Id, e.Id)
		}
	}

	if err != nil {
		return nil, err
	} else {
		defer rows.Close()

		times := make([]time.Time, 0)
		for rows.Next() {
			var tm time.Time
			if err := rows.Scan(&tm); err != nil {
				return nil, err
			}
			times = append(times, tm)
		}
		if err := rows.Err(); err != nil {
			return nil, err
		}

		return times, nil
	}
}

func (t Team) HasSolved(e Exercice) (bool, time.Time, int64) {
	var nb *int64
	var tm *time.Time
	if DBQueryRow("SELECT MIN(time) FROM exercice_solved WHERE id_team = ? AND id_exercice = ?", t.Id, e.Id).Scan(&tm); tm == nil {
		if DBQueryRow("SELECT COUNT(id_exercice), MAX(time) FROM exercice_tries WHERE id_team = ? AND id_exercice = ?", t.Id, e.Id).Scan(&nb, &tm); tm == nil {
			return false, time.Unix(0, 0), 0
		} else if nb == nil {
			return false, *tm, 0
		} else {
			return false, *tm, *nb
		}
	} else if DBQueryRow("SELECT COUNT(id_exercice) FROM exercice_solved WHERE id_exercice = ? AND time < ?", e.Id, tm).Scan(&nb); nb == nil {
		return true, *tm, 0
	} else {
		return true, *tm, *nb + 1
	}
}


type exportedTeam struct {
	Name    string       `json:"name"`
	Color   string       `json:"color"`
	Rank    int          `json:"rank"`
	Points  int64        `json:"score"`
}

func ExportTeams() (interface{}, error) {
	if teams, err := GetTeams(); err != nil {
		return nil, err
	} else if rank, err := GetRank(); err != nil {
		return nil, err
	} else {
		ret := map[string]exportedTeam{}
		for _, team := range teams {
			if points, err := team.GetPoints(); err != nil {
				return nil, err
			} else {
				ret[fmt.Sprintf("%d", team.Id)] = exportedTeam{
					team.Name,
					fmt.Sprintf("#%x", team.Color),
					rank[team.Id],
					points,
				}
			}
		}

		return ret, nil
	}
}