1 files changed, 99 insertions, 0 deletions
diff --git a/crates/shirabe/src/dependency_resolver/multi_conflict_rule.rs b/crates/shirabe/src/dependency_resolver/multi_conflict_rule.rs
index 33cd90e..fc07321 100644
--- a/crates/shirabe/src/dependency_resolver/multi_conflict_rule.rs
+++ b/crates/shirabe/src/dependency_resolver/multi_conflict_rule.rs
@@ -1 +1,100 @@
 //! ref: composer/src/Composer/DependencyResolver/MultiConflictRule.php
+
+use anyhow::Result;
+use shirabe_php_shim::{hash_raw, PHP_VERSION_ID, RuntimeException};
+use crate::dependency_resolver::generic_rule::RuleLiterals;
+use crate::dependency_resolver::rule::Rule;
+
+#[derive(Debug)]
+pub struct MultiConflictRule {
+    inner: Rule,
+    pub(crate) literals: Vec<i64>,
+}
+
+impl MultiConflictRule {
+    pub fn new(mut literals: Vec<i64>, reason: shirabe_php_shim::PhpMixed, reason_data: shirabe_php_shim::PhpMixed) -> Result<Self> {
+        if literals.len() < 3 {
+            return Err(RuntimeException {
+                message: "multi conflict rule requires at least 3 literals".to_string(),
+                code: 0,
+            }.into());
+        }
+
+        // sort all packages ascending by id
+        literals.sort();
+
+        Ok(Self {
+            inner: Rule::new(reason, reason_data),
+            literals,
+        })
+    }
+
+    pub fn get_literals(&self) -> &Vec<i64> {
+        &self.literals
+    }
+
+    pub fn get_hash(&self) -> Result<i64> {
+        let joined = self.literals.iter().map(|l| l.to_string()).collect::<Vec<_>>().join(",");
+        let algo = if PHP_VERSION_ID > 80100 { "xxh3" } else { "sha1" };
+        let binary = hash_raw(algo, &format!("c:{}", joined));
+        let data = shirabe_php_shim::unpack("ihash", &binary);
+        match data {
+            Some(map) => {
+                if let Some(val) = map.get("hash") {
+                    Ok(val.as_int().unwrap_or(0))
+                } else {
+                    Err(RuntimeException {
+                        message: format!("Failed unpacking: {}", joined),
+                        code: 0,
+                    }.into())
+                }
+            }
+            None => Err(RuntimeException {
+                message: format!("Failed unpacking: {}", joined),
+                code: 0,
+            }.into()),
+        }
+    }
+
+    pub fn equals(&self, rule: &dyn RuleLiterals) -> bool {
+        // PHP: if ($rule instanceof MultiConflictRule) { ... } return false;
+        // Phase A: instanceof check not representable via RuleLiterals trait; literals-only comparison used
+        self.literals == *rule.get_literals()
+    }
+
+    pub fn is_assertion(&self) -> bool {
+        false
+    }
+
+    pub fn disable(&mut self) -> Result<()> {
+        Err(RuntimeException {
+            message: "Disabling multi conflict rules is not possible. Please contact composer at https://github.com/composer/composer to let us debug what lead to this situation.".to_string(),
+            code: 0,
+        }.into())
+    }
+
+    pub fn to_string(&self) -> String {
+        let mut result = if self.inner.is_disabled() {
+            "disabled(multi(".to_string()
+        } else {
+            "(multi(".to_string()
+        };
+
+        // TODO multi conflict?
+        for (i, literal) in self.literals.iter().enumerate() {
+            if i != 0 {
+                result.push('|');
+            }
+            result.push_str(&literal.to_string());
+        }
+
+        result.push_str("))");
+        result
+    }
+}
+
+impl RuleLiterals for MultiConflictRule {
+    fn get_literals(&self) -> &Vec<i64> {
+        &self.literals
+    }
+}