// https://red-bean.com/sgf/user_guide/index.html
// https://red-bean.com/sgf/sgf4.html

// todo: support collections in a file
// Properties to support. Remove each one as it gets support.
//  B
//  KO
//  MN
//  W
//  AB
//  AE
//  AW
//  PL
//  C
//  DM
//  GB
//  GW
//  HO
//  N
//  UC
//  V
//  BM
//  DO
//  IT
//  TE
//  AR
//  CR
//  DD
//  LB
//  LN
//  MA
//  SL
//  SQ
//  TR
//  AP
//  CA
//  FF
//  GM
//  ST
//  SZ
//  AN
//  BR
//  BT
//  CP
//  DT
//  EV
//  GN
//  GC
//  ON
//  OT
//  PB
//  PC
//  PW
//  RE
//  RO
//  RU
//  SO
//  TM
//  US
//  WR
//  WT
//  BL
//  OB
//  OW
//  WL
//  FG
//  PM
//  VW

use nom;
use thiserror::Error;

pub enum Warning {}

#[derive(Debug, PartialEq, Error)]
pub enum ParseError {
    #[error("An unknown error was found")]
    UnknownError,
}

// todo: support ST root node
#[derive(Debug)]
pub struct GameTree {
    pub file_format: i8,
    pub app: Option<String>,
    pub game_type: GameType,
    pub board_size: Size,

    pub text: String,
}

pub struct GameInfo {
    pub annotator: Option<String>,
    pub copyright: Option<String>,
    pub event: Option<String>,
    // Games can be played across multiple days, even multiple years. The format specifies
    // shortcuts.
    pub date_time: Vec<chrono::NaiveDate>,
    pub location: Option<String>,
    // special rules for the round-number and type
    pub round: Option<String>,
    pub ruleset: Option<String>,
    pub source: Option<String>,
    pub time_limits: Option<std::time::Duration>,
    pub game_keeper: Option<String>,

    pub game_name: Option<String>,
    pub game_comments: Option<String>,

    pub black_player: Option<String>,
    pub black_rank: Option<String>,
    pub black_team: Option<String>,

    pub white_player: Option<String>,
    pub white_rank: Option<String>,
    pub white_team: Option<String>,

    pub opening: Option<String>,
    pub overtime: Option<String>,
    pub result: Option<GameResult>,
}

pub enum GameResult {
    Annulled,
    Draw,
    Black(Win),
    White(Win),
}

pub enum Win {
    Score(i32),
    Resignation,
    Forfeit,
    Time,
}

#[derive(Debug, PartialEq)]
pub struct Size {
    width: i32,
    height: i32,
}

#[derive(Debug, PartialEq)]
pub enum GameType {
    Go,
    Unsupported,
}

struct Sequence(Node);

struct Node {
    // properties
}

struct Property {
    ident: String,
    value: Vec<PropValue>,
}

enum PropType {
    Move,
    Setup,
    Root,
    GameInfo,
}

enum PropValue {
    Empty,
    Number,
    Real,
    Double,
    Color,
    SimpleText,
    Text,
    Point,
    Move,
    Stone,
}

// note: must preserve unknown properties
// note: must fix or preserve illegally formatted game-info properties
// note: must correct or delete illegally foramtted properties, but display a warning
pub fn parse_sgf(input: &str) -> Result<(GameTree, Vec<Warning>), ParseError> {
    Err(ParseError::UnknownError)
}

pub fn add(left: usize, right: usize) -> usize {
    left + right
}

#[cfg(test)]
mod tests {
    use super::*;

    const EXAMPLE_1: &'static str = "(;FF[4]C[root](;C[a];C[b](;C[c])
(;C[d];C[e]))
(;C[f](;C[g];C[h];C[i])
(;C[j])))";

    const EXAMPLE_2: &'static str = "(;FF[4]GM[1]SZ[19]AP[SGFC:1.13b]

PB[troy]BR[12k*]
PW[john]WR[11k*]
KM[0.5]RE[W+12.5]
DT[1998-06-15]
TM[600]

;B[pd];W[dp];B[pq];W[dd];B[qk];W[jd];B[fq];W[dj];B[jp];W[jj]
;B[cn]LB[dn:A][po:B]C[dada: other ideas are 'A' (d6) or 'B' (q5)]
;W[eo](;B[dl]C[dada: hm - looks troublesome.
Usually B plays the 3,3 invasion - see variation];W[qo];B[qp]
...
;W[sr];B[sk];W[sg];B[pa];W[gc];B[pi];W[ph];B[de];W[ed];B[kn]
;W[dh];B[eh];W[se];B[sd];W[af];B[ie];W[id];B[hf];W[hd];B[if]
;W[fp];B[gq];W[qj];B[sj];W[rh];B[sn];W[so];B[sm];W[ep];B[mn])
...
(;W[dq]N[wrong direction];B[qo];W[qp]))";

    fn with_examples(f: impl FnOnce(GameTree, GameTree)) {
        let (example_1, _) = parse_sgf(EXAMPLE_1).unwrap();
        let (example_2, _) = parse_sgf(EXAMPLE_2).unwrap();

        f(example_1, example_2);
    }

    #[test]
    fn it_parses_game_root() {
        with_examples(|ex_1, ex_2| {
            assert_eq!(ex_1.file_format, 4);
            assert_eq!(ex_1.app, None);
            assert_eq!(ex_1.game_type, GameType::Go);
            assert_eq!(
                ex_1.board_size,
                Size {
                    width: 19,
                    height: 19
                }
            );
            assert_eq!(ex_1.text, EXAMPLE_1.to_owned());

            assert_eq!(ex_2.file_format, 4);
            assert_eq!(ex_2.app, Some("SGFC:1.13b".to_owned()));
            assert_eq!(ex_2.game_type, GameType::Go);
            assert_eq!(
                ex_2.board_size,
                Size {
                    width: 19,
                    height: 19
                }
            );
            assert_eq!(ex_2.text, EXAMPLE_2.to_owned());
        });
    }
}