From aac3e8804e9ef62e1ad37d47bf298d989ad2388b Mon Sep 17 00:00:00 2001
From: "Christoph J. Scherr" <Christoph.Scherr@newtec.de>
Date: Thu, 1 Aug 2024 15:46:32 +0200
Subject: [PATCH] feat(naive): try to fix naive solver screwing up in less than
 1% of cases WIP

---
 src/solve/naive/mod.rs | 51 +++++++++++++++++-------------------------
 1 file changed, 20 insertions(+), 31 deletions(-)

diff --git a/src/solve/naive/mod.rs b/src/solve/naive/mod.rs
index 5548615..925de8d 100644
--- a/src/solve/naive/mod.rs
+++ b/src/solve/naive/mod.rs
@@ -3,6 +3,7 @@ use std::collections::HashMap;
 use libpt::log::{debug, info, trace};
 
 use crate::error::{SolverError, WResult};
+use crate::game::evaluation::Evaluation;
 use crate::wlist::word::{Word, WordData};
 use crate::wlist::WordList;
 
@@ -29,15 +30,12 @@ impl<'wl, WL: WordList> Solver<'wl, WL> for NaiveSolver<'wl, WL> {
     ///   word, but don't know the position of.
     fn guess_for(&self, game: &crate::game::Game<WL>) -> WResult<Word> {
         let mut pattern: String = ".".repeat(game.length());
-        // char and then the indexes we tried for that already
-        let mut other_chars: HashMap<char, Vec<usize>> = HashMap::new();
-        // a hash map telling how many of the characters may be in a correct word (+1)
-        // if the value for a char is 2 => it may be in the solution 1 time
-        // if the value for a char is 1 => it may not be in the solution
-        let mut wrong_chars: Vec<char> = Vec::new();
+        // indexes we tried for that char and the number of occurences
+        let mut other_chars: HashMap<char, (Vec<usize>, usize)> = HashMap::new();
         let responses = game.responses().iter().enumerate();
         for (_idx, response) in responses {
-            for (idx, p) in response.evaluation().clone().into_iter().enumerate() {
+            let evaluation: &Evaluation = response.evaluation();
+            for (idx, p) in evaluation.clone().into_iter().enumerate() {
                 match p.1 {
                     Status::Matched => {
                         pattern.replace_range(idx..idx + 1, &p.0.to_string());
@@ -45,14 +43,19 @@ impl<'wl, WL: WordList> Solver<'wl, WL> for NaiveSolver<'wl, WL> {
                     Status::Exists => {
                         other_chars.entry(p.0).or_default();
                         let v = other_chars.get_mut(&p.0).unwrap();
-                        v.push(idx);
+                        v.0.push(idx);
+
+                        // TODO: count how many times the char occurs
+                        v.1 =
+                            v.1.min(evaluation.guess().chars().filter(|c| *c == p.0).count());
+                    }
+                    Status::None => {
+                        other_chars.entry(p.0).or_default();
                     }
-                    Status::None => wrong_chars.push(p.0),
                 }
             }
         }
         debug!("other chars: {:?}", other_chars);
-        debug!("wrong chars: {:?}", wrong_chars);
 
         // get all words that have the correct chars on the same positions
         let mut matches: Vec<WordData> = game.wordlist().get_words_matching(&pattern)?;
@@ -68,33 +71,19 @@ impl<'wl, WL: WordList> Solver<'wl, WL> for NaiveSolver<'wl, WL> {
                 for other in other_chars.iter() {
                     if p.0.contains(*other.0) {
                         let mut already_tried: Vec<(_, _)> = Vec::new();
-                        for spot in other.1 {
-                            already_tried.push((*spot, *other.0));
+                        for spot in &other.1 .0 {
+                            already_tried.push((spot, *other.0));
                         }
 
+                        if p.0.chars().filter(|c| *c == *other.0).count() > other.1 .1 {
+                            return false; // the char occurs too often in that word
+                        }
                         for c in p.0.char_indices() {
-                            if c.1 == *other.0 && other.1.contains(&c.0) {
+                            if c.1 == *other.0 && other.1 .0.contains(&c.0) {
                                 return false;
                             }
                         }
-                    } else {
-                        return false;
-                    }
-                }
-                true
-            })
-            // only words that do not contain the letters we know are wrong
-            .filter(|p| {
-                for wrong in &wrong_chars {
-                    let in_other = other_chars.iter().filter(|v| *v.0 == *wrong).count()
-                        + pattern.chars().filter(|v| *v == *wrong).count();
-                    if p.0.contains(*wrong) {
-                        // HACK: something is still not quite right here, we basically ignore all
-                        // wrong chars if they occur in other_chars at least once, which can't be
-                        // fully correct.
-                        if in_other > 0 {
-                            continue;
-                        }
+                    } else if other.1 .1 != 0 {
                         return false;
                     }
                 }