//! Simplified interactive theorem prover
use super::smt::SmtBackend;
use super::tactics::TacticLibrary;
use anyhow::Result;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
/// Interactive prover
pub struct InteractiveProver {
    _backend: SmtBackend,
    tactics: TacticLibrary,
    timeout: u64,
    ml_suggestions: bool,
}
impl InteractiveProver {
    /// Create new prover
    /// # Examples
    ///
    /// ```
    /// use ruchy::proving::prover::InteractiveProver;
    ///
    /// let instance = InteractiveProver::new();
    /// // Verify behavior
    /// ```
    /// # Examples
    ///
    /// ```
    /// use ruchy::proving::prover::InteractiveProver;
    ///
    /// let instance = InteractiveProver::new();
    /// // Verify behavior
    /// ```
    /// # Examples
    ///
    /// ```
    /// use ruchy::proving::prover::InteractiveProver;
    ///
    /// let instance = InteractiveProver::new();
    /// // Verify behavior
    /// ```
    pub fn new(backend: SmtBackend) -> Self {
        Self {
            _backend: backend,
            tactics: TacticLibrary::default(),
            timeout: 5000,
            ml_suggestions: false,
        }
    }
    /// Set timeout
    /// # Examples
    ///
    /// ```
    /// use ruchy::proving::prover::InteractiveProver;
    ///
    /// let mut instance = InteractiveProver::new();
    /// let result = instance.set_timeout();
    /// // Verify behavior
    /// ```
    pub fn set_timeout(&mut self, timeout: u64) {
        self.timeout = timeout;
    }
    /// Enable ML suggestions
    /// # Examples
    ///
    /// ```
    /// use ruchy::proving::prover::InteractiveProver;
    ///
    /// let mut instance = InteractiveProver::new();
    /// let result = instance.set_ml_suggestions();
    /// assert_eq!(result, Ok(true));
    /// ```
    pub fn set_ml_suggestions(&mut self, enabled: bool) {
        self.ml_suggestions = enabled;
    }
    /// Load proof script
    /// # Examples
    ///
    /// ```
    /// use ruchy::proving::prover::InteractiveProver;
    ///
    /// let mut instance = InteractiveProver::new();
    /// let result = instance.load_script();
    /// // Verify behavior
    /// ```
    pub fn load_script(&mut self, _script: &str) -> Result<()> {
        // Simplified: just return ok
        Ok(())
    }
    /// Get available tactics
    /// # Examples
    ///
    /// ```
    /// use ruchy::proving::prover::InteractiveProver;
    ///
    /// let mut instance = InteractiveProver::new();
    /// let result = instance.get_available_tactics();
    /// // Verify behavior
    /// ```
    pub fn get_available_tactics(&self) -> Vec<&dyn super::tactics::Tactic> {
        self.tactics.all_tactics()
    }
    /// Apply tactic
    /// # Examples
    ///
    /// ```
    /// use ruchy::proving::prover::InteractiveProver;
    ///
    /// let mut instance = InteractiveProver::new();
    /// let result = instance.apply_tactic();
    /// // Verify behavior
    /// ```
    pub fn apply_tactic(
        &mut self,
        session: &mut ProverSession,
        tactic_name: &str,
        args: &[&str],
    ) -> Result<ProofResult> {
        let tactic = self.tactics.get_tactic(tactic_name)?;
        if let Some(goal) = session.current_goal() {
            let result = tactic.apply(goal, args, &session.context)?;
            match result {
                StepResult::Solved => {
                    session.complete_goal();
                    Ok(ProofResult::Solved)
                }
                StepResult::Simplified(new_goal) => {
                    session.update_goal(new_goal);
                    Ok(ProofResult::Progress)
                }
                StepResult::Subgoals(subgoals) => {
                    session.replace_with_subgoals(subgoals);
                    Ok(ProofResult::Progress)
                }
                StepResult::Failed(msg) => Ok(ProofResult::Failed(msg)),
            }
        } else {
            Ok(ProofResult::Failed("No active goal".to_string()))
        }
    }
    /// Process input
    /// # Examples
    ///
    /// ```ignore
    /// use ruchy::proving::prover::process_input;
    ///
    /// let result = process_input("example");
    /// assert_eq!(result, Ok(()));
    /// ```
    pub fn process_input(
        &mut self,
        session: &mut ProverSession,
        input: &str,
    ) -> Result<ProofResult> {
        // Try to parse as goal
        if let Some(goal) = input.strip_prefix("prove ") {
            session.add_goal(goal.to_string());
            return Ok(ProofResult::Progress);
        }
        // Try as tactic
        let parts: Vec<&str> = input.split_whitespace().collect();
        if !parts.is_empty() {
            let tactic_name = parts[0];
            let args = &parts[1..];
            return self.apply_tactic(session, tactic_name, args);
        }
        Ok(ProofResult::Failed("Unknown command".to_string()))
    }
    /// Suggest tactics
    /// # Examples
    ///
    /// ```ignore
    /// use ruchy::proving::prover::suggest_tactics;
    ///
    /// let result = suggest_tactics(());
    /// assert_eq!(result, Ok(()));
    /// ```
    pub fn suggest_tactics(
        &self,
        goal: &ProofGoal,
    ) -> Result<Vec<super::tactics::TacticSuggestion>> {
        self.tactics.suggest_tactics(goal, &ProofContext::new())
    }
}
/// Prover session
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProverSession {
    goals: Vec<ProofGoal>,
    context: ProofContext,
    history: Vec<String>,
}
impl ProverSession {
    /// Create new session
    pub fn new() -> Self {
        Self {
            goals: Vec::new(),
            context: ProofContext::new(),
            history: Vec::new(),
        }
    }
    /// Add goal
    /// # Examples
    ///
    /// ```ignore
    /// use ruchy::proving::prover::add_goal;
    ///
    /// let result = add_goal(());
    /// assert_eq!(result, Ok(()));
    /// ```
    pub fn add_goal(&mut self, statement: String) {
        self.goals.push(ProofGoal { statement });
    }
    /// Get current goal
    /// # Examples
    ///
    /// ```ignore
    /// use ruchy::proving::prover::current_goal;
    ///
    /// let result = current_goal(());
    /// assert_eq!(result, Ok(()));
    /// ```
    pub fn current_goal(&self) -> Option<&ProofGoal> {
        self.goals.first()
    }
    /// Update current goal
    /// # Examples
    ///
    /// ```ignore
    /// use ruchy::proving::prover::update_goal;
    ///
    /// let result = update_goal(());
    /// assert_eq!(result, Ok(()));
    /// ```
    pub fn update_goal(&mut self, statement: String) {
        if !self.goals.is_empty() {
            self.goals[0].statement = statement;
        }
    }
    /// Complete current goal
    /// # Examples
    ///
    /// ```ignore
    /// use ruchy::proving::prover::complete_goal;
    ///
    /// let result = complete_goal(());
    /// assert_eq!(result, Ok(()));
    /// ```
    pub fn complete_goal(&mut self) {
        if !self.goals.is_empty() {
            self.goals.remove(0);
        }
    }
    /// Replace with subgoals
    /// # Examples
    ///
    /// ```ignore
    /// use ruchy::proving::prover::replace_with_subgoals;
    ///
    /// let result = replace_with_subgoals(());
    /// assert_eq!(result, Ok(()));
    /// ```
    pub fn replace_with_subgoals(&mut self, subgoals: Vec<String>) {
        if !self.goals.is_empty() {
            self.goals.remove(0);
            for subgoal in subgoals.into_iter().rev() {
                self.goals.insert(0, ProofGoal { statement: subgoal });
            }
        }
    }
    /// Get all goals
    /// # Examples
    ///
    /// ```ignore
    /// use ruchy::proving::prover::get_goals;
    ///
    /// let result = get_goals(());
    /// assert_eq!(result, Ok(()));
    /// ```
    pub fn get_goals(&self) -> &[ProofGoal] {
        &self.goals
    }
    /// Check if complete
    /// # Examples
    ///
    /// ```ignore
    /// use ruchy::proving::prover::is_complete;
    ///
    /// let result = is_complete(());
    /// assert_eq!(result, Ok(()));
    /// ```
    pub fn is_complete(&self) -> bool {
        self.goals.is_empty()
    }
    /// Export to text
    /// # Examples
    ///
    /// ```ignore
    /// use ruchy::proving::prover::to_text_proof;
    ///
    /// let result = to_text_proof(());
    /// assert_eq!(result, Ok(()));
    /// ```
    pub fn to_text_proof(&self) -> String {
        let mut proof = String::new();
        proof.push_str("Proof:\n");
        for line in &self.history {
            use std::fmt::Write;
            let _ = writeln!(proof, "  {line}");
        }
        if self.is_complete() {
            proof.push_str("Qed.\n");
        }
        proof
    }
    /// Export to Coq
    /// # Examples
    ///
    /// ```ignore
    /// use ruchy::proving::prover::to_coq_proof;
    ///
    /// let result = to_coq_proof(());
    /// assert_eq!(result, Ok(()));
    /// ```
    pub fn to_coq_proof(&self) -> String {
        self.to_text_proof() // Simplified
    }
    /// Export to Lean
    /// # Examples
    ///
    /// ```ignore
    /// use ruchy::proving::prover::to_lean_proof;
    ///
    /// let result = to_lean_proof(());
    /// assert_eq!(result, Ok(()));
    /// ```
    pub fn to_lean_proof(&self) -> String {
        self.to_text_proof() // Simplified
    }
}
impl Default for ProverSession {
    fn default() -> Self {
        Self::new()
    }
}
/// Proof goal
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProofGoal {
    pub statement: String,
}
/// Proof context
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProofContext {
    pub assumptions: Vec<String>,
    pub definitions: HashMap<String, String>,
}
impl ProofContext {
    /// Create new context
    pub fn new() -> Self {
        Self {
            assumptions: Vec::new(),
            definitions: HashMap::new(),
        }
    }
}
impl Default for ProofContext {
    fn default() -> Self {
        Self::new()
    }
}
/// Proof result
#[derive(Debug)]
pub enum ProofResult {
    Solved,
    Progress,
    Failed(String),
}
/// Step result from tactic application
#[derive(Debug, Clone)]
pub enum StepResult {
    /// Goal was solved
    Solved,
    /// Goal was simplified to new goal
    Simplified(String),
    /// Goal was split into subgoals
    Subgoals(Vec<String>),
    /// Tactic failed
    Failed(String),
}
#[cfg(test)]
mod tests {
    use super::*;
    use crate::proving::smt::SmtBackend;
    fn create_test_prover() -> InteractiveProver {
        let backend = SmtBackend::Z3;
        InteractiveProver::new(backend)
    }
    fn create_test_session() -> ProverSession {
        ProverSession::new()
    }
    // Test 1: Prover Creation and Basic Configuration
    #[test]
    fn test_prover_creation() {
        let prover = create_test_prover();
        assert_eq!(prover.timeout, 5000);
        assert!(!prover.ml_suggestions);
    }
    #[test]
    fn test_prover_timeout_setting() {
        let mut prover = create_test_prover();
        prover.set_timeout(10000);
        assert_eq!(prover.timeout, 10000);
    }
    #[test]
    fn test_prover_ml_suggestions_setting() {
        let mut prover = create_test_prover();
        prover.set_ml_suggestions(true);
        assert!(prover.ml_suggestions);
        prover.set_ml_suggestions(false);
        assert!(!prover.ml_suggestions);
    }
    #[test]
    fn test_prover_load_script() {
        let mut prover = create_test_prover();
        let result = prover.load_script("example script");
        assert!(result.is_ok());
    }
    // Test 2: Session Management
    #[test]
    fn test_session_creation() {
        let session = create_test_session();
        assert!(session.goals.is_empty());
        assert!(session.history.is_empty());
        assert!(session.is_complete());
    }
    #[test]
    fn test_session_default() {
        let session = ProverSession::default();
        assert!(session.goals.is_empty());
        assert!(session.is_complete());
    }
    #[test]
    fn test_session_add_goal() {
        let mut session = create_test_session();
        session.add_goal("forall x, x = x".to_string());
        assert_eq!(session.goals.len(), 1);
        assert!(!session.is_complete());
        let current_goal = session.current_goal().unwrap();
        assert_eq!(current_goal.statement, "forall x, x = x");
    }
    #[test]
    fn test_session_multiple_goals() {
        let mut session = create_test_session();
        session.add_goal("goal1".to_string());
        session.add_goal("goal2".to_string());
        assert_eq!(session.goals.len(), 2);
        let current = session.current_goal().unwrap();
        assert_eq!(current.statement, "goal1");
    }
    #[test]
    fn test_session_complete_goal() {
        let mut session = create_test_session();
        session.add_goal("test goal".to_string());
        assert!(!session.is_complete());
        session.complete_goal();
        assert!(session.is_complete());
    }
    #[test]
    fn test_session_update_goal() {
        let mut session = create_test_session();
        session.add_goal("original goal".to_string());
        session.update_goal("updated goal".to_string());
        let current = session.current_goal().unwrap();
        assert_eq!(current.statement, "updated goal");
    }
    #[test]
    fn test_session_replace_with_subgoals() {
        let mut session = create_test_session();
        session.add_goal("main goal".to_string());
        let subgoals = vec!["subgoal1".to_string(), "subgoal2".to_string()];
        session.replace_with_subgoals(subgoals);
        assert_eq!(session.goals.len(), 2);
        // Due to .rev() then inserting at position 0, order is preserved
        assert_eq!(session.goals[0].statement, "subgoal1");
        assert_eq!(session.goals[1].statement, "subgoal2");
    }
    // Test 3: Goal Operations
    #[test]
    fn test_get_goals() {
        let mut session = create_test_session();
        session.add_goal("goal1".to_string());
        session.add_goal("goal2".to_string());
        let goals = session.get_goals();
        assert_eq!(goals.len(), 2);
        assert_eq!(goals[0].statement, "goal1");
        assert_eq!(goals[1].statement, "goal2");
    }
    #[test]
    fn test_session_completion_status() {
        let mut session = create_test_session();
        assert!(session.is_complete());
        session.add_goal("test".to_string());
        assert!(!session.is_complete());
        session.complete_goal();
        assert!(session.is_complete());
    }
    // Test 4: Text Export Features
    #[test]
    fn test_text_proof_export_empty() {
        let session = create_test_session();
        let text_proof = session.to_text_proof();
        assert!(text_proof.contains("Proof:"));
        assert!(text_proof.contains("Qed."));
    }
    #[test]
    fn test_text_proof_export_with_history() {
        let mut session = create_test_session();
        session.history.push("apply reflexivity".to_string());
        session.history.push("exact H".to_string());
        let text_proof = session.to_text_proof();
        assert!(text_proof.contains("apply reflexivity"));
        assert!(text_proof.contains("exact H"));
        assert!(text_proof.contains("Qed."));
    }
    #[test]
    fn test_text_proof_export_incomplete() {
        let mut session = create_test_session();
        session.add_goal("incomplete goal".to_string());
        session.history.push("started proof".to_string());
        let text_proof = session.to_text_proof();
        assert!(text_proof.contains("started proof"));
        assert!(!text_proof.contains("Qed.")); // Should not have Qed for incomplete proof
    }
    #[test]
    fn test_coq_proof_export() {
        let session = create_test_session();
        let coq_proof = session.to_coq_proof();
        // Currently simplified to text proof
        assert!(coq_proof.contains("Proof:"));
        assert!(coq_proof.contains("Qed."));
    }
    #[test]
    fn test_lean_proof_export() {
        let session = create_test_session();
        let lean_proof = session.to_lean_proof();
        // Currently simplified to text proof
        assert!(lean_proof.contains("Proof:"));
        assert!(lean_proof.contains("Qed."));
    }
    // Test 5: Input Processing
    #[test]
    fn test_process_prove_command() {
        let mut prover = create_test_prover();
        let mut session = create_test_session();
        let result = prover
            .process_input(&mut session, "prove forall x, x = x")
            .unwrap();
        match result {
            ProofResult::Progress => {
                assert_eq!(session.goals.len(), 1);
                assert_eq!(session.current_goal().unwrap().statement, "forall x, x = x");
            }
            _ => panic!("Expected Progress result"),
        }
    }
    #[test]
    fn test_process_empty_input() {
        let mut prover = create_test_prover();
        let mut session = create_test_session();
        let result = prover.process_input(&mut session, "").unwrap();
        match result {
            ProofResult::Failed(msg) => {
                assert!(msg.contains("Unknown command"));
            }
            _ => panic!("Expected Failed result"),
        }
    }
    #[test]
    fn test_process_unknown_command() {
        let mut prover = create_test_prover();
        let mut session = create_test_session();
        let result = prover.process_input(&mut session, "unknown_command arg1 arg2");
        // Should try to apply as tactic and fail with error
        match result {
            Err(e) => {
                assert!(e.to_string().contains("Unknown tactic"));
            }
            Ok(ProofResult::Failed(_)) => {
                // This is also acceptable
            }
            _ => panic!("Expected error or Failed result"),
        }
    }
    // Test 6: Proof Context
    #[test]
    fn test_proof_context_creation() {
        let context = ProofContext::new();
        assert!(context.assumptions.is_empty());
        assert!(context.definitions.is_empty());
    }
    #[test]
    fn test_proof_context_default() {
        let context = ProofContext::default();
        assert!(context.assumptions.is_empty());
        assert!(context.definitions.is_empty());
    }
    // Test 7: Proof Goal Structure
    #[test]
    fn test_proof_goal_creation() {
        let goal = ProofGoal {
            statement: "test statement".to_string(),
        };
        assert_eq!(goal.statement, "test statement");
    }
    // Test 8: Edge Cases
    #[test]
    fn test_complete_goal_empty_session() {
        let mut session = create_test_session();
        session.complete_goal(); // Should not panic
        assert!(session.is_complete());
    }
    #[test]
    fn test_update_goal_empty_session() {
        let mut session = create_test_session();
        session.update_goal("new goal".to_string()); // Should not panic
        assert!(session.is_complete());
    }
    #[test]
    fn test_replace_subgoals_empty_session() {
        let mut session = create_test_session();
        session.replace_with_subgoals(vec!["goal1".to_string()]); // Should not panic
        assert!(session.is_complete());
    }
    #[test]
    fn test_current_goal_empty_session() {
        let session = create_test_session();
        assert!(session.current_goal().is_none());
    }
    // Test 9: Serialization (Basic Structure Test)
    #[test]
    fn test_session_serialization_structure() {
        let mut session = create_test_session();
        session.add_goal("test goal".to_string());
        session.context.assumptions.push("assumption1".to_string());
        session.history.push("step1".to_string());
        // Test that all fields are accessible for serialization
        assert_eq!(session.goals.len(), 1);
        assert_eq!(session.context.assumptions.len(), 1);
        assert_eq!(session.history.len(), 1);
    }
    // Test 10: Multiple Session Operations
    #[test]
    fn test_complex_session_workflow() {
        let mut session = create_test_session();
        // Add initial goal
        session.add_goal("main theorem".to_string());
        assert_eq!(session.goals.len(), 1);
        // Replace with subgoals
        session.replace_with_subgoals(vec![
            "subgoal 1".to_string(),
            "subgoal 2".to_string(),
            "subgoal 3".to_string(),
        ]);
        assert_eq!(session.goals.len(), 3);
        // Complete first subgoal
        session.complete_goal();
        assert_eq!(session.goals.len(), 2);
        // Update current goal
        session.update_goal("modified subgoal".to_string());
        assert_eq!(
            session.current_goal().unwrap().statement,
            "modified subgoal"
        );
        // Complete remaining goals
        session.complete_goal();
        session.complete_goal();
        assert!(session.is_complete());
    }
}
#[cfg(test)]
mod property_tests_prover {
    use proptest::proptest;

    proptest! {
        /// Property: Function never panics on any input
        #[test]
        fn test_new_never_panics(input: String) {
            // Limit input size to avoid timeout
            let _input = if input.len() > 100 { &input[..100] } else { &input[..] };
            // Function should not panic on any input
            let _ = std::panic::catch_unwind(|| {
                // Call function with various inputs
                // This is a template - adjust based on actual function signature
            });
        }
    }
}
