soma-core 2.0.0

/// Issue #19: Granular Approval Levels CLI Interface
/// Enhanced multi-level approval system with role-based approval workflow

use crate::edit_control::{
    ApprovalLevel, ApprovalRecord, ApprovalRole, ApprovalState, 
    GranularApprovalSystem, ModifiableEdit
};
use crossterm::{
    cursor, execute, style, terminal,
    event::{self, Event, KeyCode, KeyEvent, KeyModifiers},
    style::{Color, SetForegroundColor, ResetColor},
    terminal::ClearType,
};
use std::io::{self, Write};
use std::time::SystemTime;

/// Enhanced approval decision with granular levels
#[derive(Debug, Clone, PartialEq)]
pub enum GranularApprovalDecision {
    Approve(ApprovalRole),
    ApproveWithComments(ApprovalRole, String),
    RequestEscalation(String),
    Delegate(ApprovalRole, String), // Delegate to another role with reason
    ConditionalApproval(ApprovalRole, Vec<String>), // Conditions that must be met
    Reject(String),
    MoreInfo,
    Skip,
}

/// Interactive granular approval interface
pub struct GranularApprovalInterface {
    approval_system: GranularApprovalSystem,
    current_user_role: ApprovalRole,
    current_user_id: String,
    #[allow(dead_code)]
    approval_history: Vec<ApprovalRecord>,
}

impl GranularApprovalInterface {
    pub fn new(user_role: ApprovalRole, user_id: String) -> Self {
        Self {
            approval_system: GranularApprovalSystem::new(),
            current_user_role: user_role,
            current_user_id: user_id,
            approval_history: Vec::new(),
        }
    }

    /// Main entry point for granular approval workflow
    pub fn process_approval_request(
        &mut self, 
        edit: &mut ModifiableEdit
    ) -> Result<GranularApprovalDecision, Box<dyn std::error::Error>> {
        // Clear screen and initialize
        execute!(io::stdout(), terminal::Clear(ClearType::All), cursor::MoveTo(0, 0))?;
        
        // Determine required approval level
        let required_level = self.approval_system.determine_required_level(edit);
        
        // Display edit information and approval context
        self.display_edit_overview(edit, &required_level)?;
        
        // Display current approval status
        self.display_approval_status(edit, &required_level)?;
        
        // Show approval options based on user role and required level
        self.display_approval_options(&required_level)?;
        
        // Get user decision
        self.get_approval_decision(edit, &required_level)
    }

    fn display_edit_overview(
        &self, 
        edit: &ModifiableEdit, 
        required_level: &ApprovalLevel
    ) -> Result<(), Box<dyn std::error::Error>> {
        println!("╔═══════════════════════════════════════════════════════════════════════╗");
        println!("║                    🔒 GRANULAR APPROVAL REQUIRED                     ║");
        println!("╚═══════════════════════════════════════════════════════════════════════╝");
        
        // Edit details
        println!("\n📝 Edit Details:");
        println!("   File: {}", edit.base_edit.file);
        println!("   Lines: {:?}", edit.base_edit.line_range);
        println!("   Confidence: {:.1}%", edit.get_effective_confidence() * 100.0);
        println!("   File: {}", edit.base_edit.file);
        println!("   Reason: {}", edit.base_edit.reason);
        
        // Required approval level with color coding
        print!("\n🎯 Required Approval Level: ");
        match required_level {
            ApprovalLevel::Auto => {
                execute!(io::stdout(), 
                    SetForegroundColor(Color::Green),
                    style::Print("AUTO"),
                    ResetColor
                )?;
                println!(" (Automatic approval)");
            }
            ApprovalLevel::Low => {
                execute!(io::stdout(), 
                    SetForegroundColor(Color::Blue),
                    style::Print("LOW"),
                    ResetColor
                )?;
                println!(" (Single reviewer required)");
            }
            ApprovalLevel::Medium => {
                execute!(io::stdout(), 
                    SetForegroundColor(Color::Yellow),
                    style::Print("MEDIUM"),
                    ResetColor
                )?;
                println!(" (Senior reviewer or 2 junior reviewers)");
            }
            ApprovalLevel::High => {
                execute!(io::stdout(), 
                    SetForegroundColor(Color::Magenta),
                    style::Print("HIGH"),
                    ResetColor
                )?;
                println!(" (Lead/Architect approval required)");
            }
            ApprovalLevel::Critical => {
                execute!(io::stdout(), 
                    SetForegroundColor(Color::Red),
                    style::Print("CRITICAL"),
                    ResetColor
                )?;
                println!(" (Multiple leads + security review)");
            }
        }

        // Risk assessment
        self.display_risk_assessment(edit)?;
        
        Ok(())
    }

    fn display_risk_assessment(&self, edit: &ModifiableEdit) -> Result<(), Box<dyn std::error::Error>> {
        println!("\n⚠️  Risk Assessment:");
        
        let lines_changed = edit.base_edit.new_code.lines().count();
        let confidence = edit.get_effective_confidence();
        
        // Lines changed assessment
        if lines_changed > self.approval_system.policy.risk_thresholds.lines_changed_high_risk {
            execute!(io::stdout(), SetForegroundColor(Color::Red))?;
            println!("   🔴 Large change: {} lines modified", lines_changed);
        } else if lines_changed > 20 {
            execute!(io::stdout(), SetForegroundColor(Color::Yellow))?;
            println!("   🟡 Medium change: {} lines modified", lines_changed);
        } else {
            execute!(io::stdout(), SetForegroundColor(Color::Green))?;
            println!("   🟢 Small change: {} lines modified", lines_changed);
        }
        execute!(io::stdout(), ResetColor)?;
        
        // Confidence assessment
        if confidence < self.approval_system.policy.risk_thresholds.confidence_threshold_escalation {
            execute!(io::stdout(), SetForegroundColor(Color::Red))?;
            println!("   🔴 Low confidence: {:.1}% (may require escalation)", confidence * 100.0);
        } else if confidence < 0.8 {
            execute!(io::stdout(), SetForegroundColor(Color::Yellow))?;
            println!("   🟡 Medium confidence: {:.1}%", confidence * 100.0);
        } else {
            execute!(io::stdout(), SetForegroundColor(Color::Green))?;
            println!("   🟢 High confidence: {:.1}%", confidence * 100.0);
        }
        execute!(io::stdout(), ResetColor)?;
        
        // Security pattern check
        let code_lower = edit.base_edit.new_code.to_lowercase();
        for pattern in &self.approval_system.policy.risk_thresholds.security_sensitive_patterns {
            if code_lower.contains(pattern) {
                execute!(io::stdout(), SetForegroundColor(Color::Red))?;
                println!("   🔴 Security-sensitive: Contains '{}'", pattern);
                execute!(io::stdout(), ResetColor)?;
                break;
            }
        }
        
        Ok(())
    }

    fn display_approval_status(
        &self, 
        edit: &ModifiableEdit, 
        required_level: &ApprovalLevel
    ) -> Result<(), Box<dyn std::error::Error>> {
        println!("\n📊 Current Approval Status:");
        
        // Extract current approvals from edit state
        let current_approvals = match &edit.approval_state {
            ApprovalState::GranularPending { current_approvals, .. } => current_approvals,
            ApprovalState::PartiallyApproved { approvals, .. } => approvals,
            ApprovalState::EscalationRequired { approvals, .. } => approvals,
            _ => {
                println!("   ⏳ No approvals yet");
                return Ok(());
            }
        };
        
        if current_approvals.is_empty() {
            println!("   ⏳ No approvals yet");
            return Ok(());
        }
        
        // Create temporary system to calculate status
        let mut temp_system = GranularApprovalSystem::new();
        for approval in current_approvals {
            let _ = temp_system.add_approval(approval.clone());
        }
        
        let status = temp_system.get_approval_status(required_level);
        
        println!("   📈 Progress: {}/{} approvals", status.approval_count, 
                 self.calculate_required_approvals(required_level));
        println!("   🎯 Current Level: {:?}", status.current_level);
        println!("   ✅ Sufficient: {}", if status.is_sufficient { "Yes" } else { "No" });
        
        if let Some(next_role) = status.next_required_role {
            println!("   👤 Next Required: {:?}", next_role);
        }
        
        // Display individual approvals
        println!("\n📋 Approval History:");
        for (i, approval) in current_approvals.iter().enumerate() {
            let _timestamp = approval.timestamp
                .duration_since(SystemTime::UNIX_EPOCH)
                .unwrap_or_default()
                .as_secs();
            println!("   {}. {:?} by {} ({}s ago)", 
                     i + 1, 
                     approval.approver_role, 
                     approval.approver_id,
                     SystemTime::now().duration_since(approval.timestamp)
                         .unwrap_or_default().as_secs());
            
            if let Some(comments) = &approval.comments {
                println!("      💬 \"{comments}\"");
            }
        }
        
        Ok(())
    }

    fn display_approval_options(&self, required_level: &ApprovalLevel) -> Result<(), Box<dyn std::error::Error>> {
        println!("\n🎛️  Approval Options:");
        println!("   Current User: {} ({:?})", self.current_user_id, self.current_user_role);
        
        // Check if user can approve at current level
        let can_approve = self.can_user_approve_at_level(required_level);
        
        if can_approve {
            execute!(io::stdout(), SetForegroundColor(Color::Green))?;
            println!("   [a] ✅ Approve");
            execute!(io::stdout(), ResetColor)?;
            println!("   [c] 💬 Approve with Comments");
        } else {
            execute!(io::stdout(), SetForegroundColor(Color::DarkGrey))?;
            println!("   [a] ❌ Approve (insufficient role)");
            execute!(io::stdout(), ResetColor)?;
        }
        
        println!("   [e] 🔺 Request Escalation");
        println!("   [d] 👥 Delegate to Another Reviewer");
        println!("   [o] ⚠️  Conditional Approval (with conditions)");
        println!("   [r] ❌ Reject");
        println!("   [i] ℹ️  More Information");
        println!("   [s] ⏭️  Skip");
        
        // Show code preview option
        println!("   [v] 👁️  View Code Changes");
        
        Ok(())
    }

    fn get_approval_decision(
        &mut self, 
        edit: &ModifiableEdit, 
        required_level: &ApprovalLevel
    ) -> Result<GranularApprovalDecision, Box<dyn std::error::Error>> {
        print!("\n🤔 Your decision: ");
        io::stdout().flush()?;
        
        loop {
            if let Event::Key(KeyEvent { code, modifiers: KeyModifiers::NONE, .. }) = event::read()? {
                match code {
                    KeyCode::Char('a') => {
                        if self.can_user_approve_at_level(required_level) {
                            return Ok(GranularApprovalDecision::Approve(self.current_user_role.clone()));
                        } else {
                            println!("\n❌ Insufficient role for approval at this level");
                            print!("🤔 Your decision: ");
                            io::stdout().flush()?;
                        }
                    }
                    KeyCode::Char('c') => {
                        if self.can_user_approve_at_level(required_level) {
                            let comments = self.get_approval_comments()?;
                            return Ok(GranularApprovalDecision::ApproveWithComments(
                                self.current_user_role.clone(), 
                                comments
                            ));
                        } else {
                            println!("\n❌ Insufficient role for approval at this level");
                            print!("🤔 Your decision: ");
                            io::stdout().flush()?;
                        }
                    }
                    KeyCode::Char('e') => {
                        let reason = self.get_escalation_reason()?;
                        return Ok(GranularApprovalDecision::RequestEscalation(reason));
                    }
                    KeyCode::Char('d') => {
                        let (target_role, reason) = self.get_delegation_info()?;
                        return Ok(GranularApprovalDecision::Delegate(target_role, reason));
                    }
                    KeyCode::Char('o') => {
                        let conditions = self.get_approval_conditions()?;
                        return Ok(GranularApprovalDecision::ConditionalApproval(
                            self.current_user_role.clone(), 
                            conditions
                        ));
                    }
                    KeyCode::Char('r') => {
                        let reason = self.get_rejection_reason()?;
                        return Ok(GranularApprovalDecision::Reject(reason));
                    }
                    KeyCode::Char('i') => {
                        return Ok(GranularApprovalDecision::MoreInfo);
                    }
                    KeyCode::Char('s') => {
                        return Ok(GranularApprovalDecision::Skip);
                    }
                    KeyCode::Char('v') => {
                        self.display_code_changes(edit)?;
                        println!("\nPress any key to continue...");
                        event::read()?;
                        self.display_approval_options(required_level)?;
                        print!("🤔 Your decision: ");
                        io::stdout().flush()?;
                    }
                    KeyCode::Esc => {
                        return Ok(GranularApprovalDecision::Skip);
                    }
                    _ => {
                        println!("\n❓ Invalid option. Please try again.");
                        print!("🤔 Your decision: ");
                        io::stdout().flush()?;
                    }
                }
            }
        }
    }

    fn display_code_changes(&self, edit: &ModifiableEdit) -> Result<(), Box<dyn std::error::Error>> {
        execute!(io::stdout(), terminal::Clear(ClearType::All), cursor::MoveTo(0, 0))?;
        
        println!("╔═══════════════════════════════════════════════════════════════════════╗");
        println!("║                           📄 CODE CHANGES                            ║");
        println!("╚═══════════════════════════════════════════════════════════════════════╝");
        
        println!("\n📁 File: {}", edit.base_edit.file);
        println!("📍 Lines: {:?}", edit.base_edit.line_range);
        
        println!("\n📝 Proposed Code:");
        println!("{}", "─".repeat(70));
        
        for (i, line) in edit.base_edit.new_code.lines().enumerate() {
            println!("{:3}: {}", i + 1, line);
        }
        
        println!("{}", "─".repeat(70));
        
        // Show final code if modifications exist
        if !edit.modifications.is_empty() {
            println!("\n🔄 Final Code (with modifications):");
            println!("{}", "─".repeat(70));
            
            let final_code = edit.compute_final_code();
            for (i, line) in final_code.lines().enumerate() {
                println!("{:3}: {}", i + 1, line);
            }
            
            println!("{}", "─".repeat(70));
        }
        
        Ok(())
    }

    fn get_approval_comments(&self) -> Result<String, Box<dyn std::error::Error>> {
        println!("\n💬 Enter approval comments (press Enter when done):");
        print!("Comments: ");
        io::stdout().flush()?;
        
        let mut comments = String::new();
        io::stdin().read_line(&mut comments)?;
        Ok(comments.trim().to_string())
    }

    fn get_escalation_reason(&self) -> Result<String, Box<dyn std::error::Error>> {
        println!("\n🔺 Enter escalation reason:");
        print!("Reason: ");
        io::stdout().flush()?;
        
        let mut reason = String::new();
        io::stdin().read_line(&mut reason)?;
        Ok(reason.trim().to_string())
    }

    fn get_delegation_info(&self) -> Result<(ApprovalRole, String), Box<dyn std::error::Error>> {
        println!("\n👥 Delegate to which role?");
        println!("   [1] Junior");
        println!("   [2] Senior");
        println!("   [3] Lead");
        println!("   [4] Architect");
        println!("   [5] Security");
        print!("Choice: ");
        io::stdout().flush()?;
        
        let mut choice = String::new();
        io::stdin().read_line(&mut choice)?;
        
        let target_role = match choice.trim() {
            "1" => ApprovalRole::Junior,
            "2" => ApprovalRole::Senior,
            "3" => ApprovalRole::Lead,
            "4" => ApprovalRole::Architect,
            "5" => ApprovalRole::Security,
            _ => return Err("Invalid role selection".into()),
        };
        
        println!("Enter delegation reason:");
        print!("Reason: ");
        io::stdout().flush()?;
        
        let mut reason = String::new();
        io::stdin().read_line(&mut reason)?;
        
        Ok((target_role, reason.trim().to_string()))
    }

    fn get_approval_conditions(&self) -> Result<Vec<String>, Box<dyn std::error::Error>> {
        println!("\n⚠️  Enter conditions for approval (one per line, empty line to finish):");
        
        let mut conditions = Vec::new();
        let mut line_num = 1;
        
        loop {
            print!("Condition {}: ", line_num);
            io::stdout().flush()?;
            
            let mut condition = String::new();
            io::stdin().read_line(&mut condition)?;
            let condition = condition.trim();
            
            if condition.is_empty() {
                break;
            }
            
            conditions.push(condition.to_string());
            line_num += 1;
        }
        
        Ok(conditions)
    }

    fn get_rejection_reason(&self) -> Result<String, Box<dyn std::error::Error>> {
        println!("\n❌ Enter rejection reason:");
        print!("Reason: ");
        io::stdout().flush()?;
        
        let mut reason = String::new();
        io::stdin().read_line(&mut reason)?;
        Ok(reason.trim().to_string())
    }

    fn can_user_approve_at_level(&self, required_level: &ApprovalLevel) -> bool {
        match required_level {
            ApprovalLevel::Auto => true, // Anyone can approve auto-level
            ApprovalLevel::Low => matches!(
                self.current_user_role,
                ApprovalRole::Senior | ApprovalRole::Lead | ApprovalRole::Architect | ApprovalRole::Security
            ),
            ApprovalLevel::Medium => matches!(
                self.current_user_role,
                ApprovalRole::Senior | ApprovalRole::Lead | ApprovalRole::Architect | ApprovalRole::Security
            ),
            ApprovalLevel::High => matches!(
                self.current_user_role,
                ApprovalRole::Lead | ApprovalRole::Architect | ApprovalRole::Security
            ),
            ApprovalLevel::Critical => matches!(
                self.current_user_role,
                ApprovalRole::Architect | ApprovalRole::Security
            ),
        }
    }

    fn calculate_required_approvals(&self, level: &ApprovalLevel) -> usize {
        match level {
            ApprovalLevel::Auto => 0,
            ApprovalLevel::Low => 1,
            ApprovalLevel::Medium => 2,
            ApprovalLevel::High => 1,
            ApprovalLevel::Critical => 2,
        }
    }

    /// Apply the approval decision to the edit
    pub fn apply_decision(
        &mut self,
        edit: &mut ModifiableEdit,
        decision: GranularApprovalDecision
    ) -> Result<(), Box<dyn std::error::Error>> {
        match decision {
            GranularApprovalDecision::Approve(role) => {
                let approval = ApprovalRecord {
                    approver_id: self.current_user_id.clone(),
                    approver_role: role,
                    level: self.approval_system.determine_required_level(edit),
                    timestamp: SystemTime::now(),
                    comments: None,
                    delegation_chain: Vec::new(),
                };
                
                edit.add_approval_record(approval)?;
                edit.evaluate_granular_approval()?;
            }
            GranularApprovalDecision::ApproveWithComments(role, comments) => {
                let approval = ApprovalRecord {
                    approver_id: self.current_user_id.clone(),
                    approver_role: role,
                    level: self.approval_system.determine_required_level(edit),
                    timestamp: SystemTime::now(),
                    comments: Some(comments),
                    delegation_chain: Vec::new(),
                };
                
                edit.add_approval_record(approval)?;
                edit.evaluate_granular_approval()?;
            }
            GranularApprovalDecision::RequestEscalation(reason) => {
                let current_level = self.approval_system.determine_required_level(edit);
                let required_level = match current_level {
                    ApprovalLevel::Auto => ApprovalLevel::Low,
                    ApprovalLevel::Low => ApprovalLevel::Medium,
                    ApprovalLevel::Medium => ApprovalLevel::High,
                    ApprovalLevel::High => ApprovalLevel::Critical,
                    ApprovalLevel::Critical => ApprovalLevel::Critical, // Already at max
                };
                
                edit.approval_state = ApprovalState::EscalationRequired {
                    current_level,
                    required_level,
                    reason,
                    approvals: Vec::new(),
                };
            }
            GranularApprovalDecision::Reject(reason) => {
                edit.approval_state = ApprovalState::Rejected;
                println!("❌ Edit rejected: {}", reason);
            }
            GranularApprovalDecision::ConditionalApproval(_role, conditions) => {
                edit.approval_state = ApprovalState::Conditional { conditions };
            }
            _ => {
                // Handle other cases (delegate, more info, skip)
                println!("ℹ️  Decision noted: {:?}", decision);
            }
        }
        
        Ok(())
    }
}

/// Utility function to create approval record
pub fn create_approval_record(
    approver_id: String,
    role: ApprovalRole,
    level: ApprovalLevel,
    comments: Option<String>
) -> ApprovalRecord {
    ApprovalRecord {
        approver_id,
        approver_role: role,
        level,
        timestamp: SystemTime::now(),
        comments,
        delegation_chain: Vec::new(),
    }
}

/// Integration function for CLI workflow
pub fn process_edit_with_granular_approval(
    edit: &mut ModifiableEdit,
    user_role: ApprovalRole,
    user_id: String
) -> Result<(), Box<dyn std::error::Error>> {
    let mut approval_interface = GranularApprovalInterface::new(user_role, user_id);
    
    let decision = approval_interface.process_approval_request(edit)?;
    approval_interface.apply_decision(edit, decision)?;
    
    Ok(())
}