#!/usr/bin/env python3
"""
CLI interface for tddai library.
"""

import sys
import argparse
from pathlib import Path

# Add current directory to path so we can import tddai
sys.path.insert(0, str(Path(__file__).parent))

from tddai import (
    WorkspaceManager, IssueFetcher, TestGenerator, CoverageAnalyzer,
    WorkspaceStatus, TddaiError
)


def workspace_status():
    """Show current workspace status."""
    try:
        manager = WorkspaceManager()
        status = manager.get_status()

        if status == WorkspaceStatus.CLEAN:
            print("📋 No active issue workspace")
            print("   Use 'make tdd-start NUM=X' to begin working on an issue")
            return

        if status == WorkspaceStatus.DIRTY:
            print("⚠️  Workspace directory exists but no current issue file")
            print("   Run 'make tdd-finish' to clean up or 'make tdd-start' to create new workspace")
            return

        workspace = manager.get_current_workspace()
        if not workspace:
            print("❌ Failed to load workspace")
            return

        print("📋 Active Issue Workspace")
        print("========================")
        print()
        print(f"🎯 Issue #{workspace.issue_number}: {workspace.issue_title}")
        print(f"📊 Status: {workspace.issue_state}")
        print(f"📁 Workspace: {workspace.workspace_dir}/issue_{workspace.issue_number}/")
        print()

        if workspace.tests_dir.exists():
            test_files = list(workspace.tests_dir.glob("*.py"))
            print(f"🧪 Generated Tests ({len(test_files)}):")
            if test_files:
                for test_file in test_files:
                    print(f"   - {test_file.name}")
            else:
                print("   - No tests generated yet")
            print()

        print("📋 Workspace Files:")
        print("   - requirements.md (review and break down issue)")
        print("   - test_plan.md (plan test scenarios)")
        print("   - tests/ (generated test files)")
        print()
        print("💡 Commands:")
        print("   - make tdd-add-test  (generate another test)")
        print("   - make tdd-finish    (complete and move tests to main)")

    except TddaiError as e:
        print(f"❌ Error: {e}")
        sys.exit(1)


def start_issue(issue_number: int):
    """Start working on an issue."""
    try:
        manager = WorkspaceManager()
        fetcher = IssueFetcher()

        # Check if workspace already active
        status = manager.get_status()
        if status == WorkspaceStatus.ACTIVE:
            current = manager.get_current_workspace()
            print(f"⚠️  Already working on issue #{current.issue_number}")
            print("   Run 'make tdd-finish' first or 'make tdd-status' to see details")
            sys.exit(1)

        print(f"🔍 Starting work on issue #{issue_number}...")
        print(f"📋 Fetching issue #{issue_number} details...")

        # Fetch issue data
        issue_data = fetcher.get_issue_data_dict(issue_number)

        # Create workspace
        workspace = manager.create_workspace(issue_data)

        print(f"✅ Workspace created for issue #{issue_number}")
        print(f"📁 Workspace: {workspace.workspace_dir}/issue_{issue_number}/")
        print(f"📋 Requirements: {workspace.requirements_file}")
        print(f"🧪 Test plan: {workspace.test_plan_file}")
        print()
        print("💡 Next steps:")
        print("   1. Review requirements.md and break down the issue")
        print("   2. Plan test scenarios in test_plan.md")
        print("   3. Use 'make tdd-add-test' to generate tests")
        print("   4. Use 'make tdd-finish' when complete")

    except TddaiError as e:
        print(f"❌ Error: {e}")
        sys.exit(1)


def finish_issue():
    """Finish current issue workspace."""
    try:
        manager = WorkspaceManager()

        workspace = manager.get_current_workspace()
        if not workspace:
            print("❌ No active issue workspace")
            print("   Nothing to finish")
            sys.exit(1)

        print(f"🏁 Finishing work on issue #{workspace.issue_number}")
        print()

        # Check for tests
        if workspace.tests_dir.exists():
            test_files = list(workspace.tests_dir.glob("*.py"))
            if test_files:
                print(f"📦 Moving {len(test_files)} test(s) to tests/ directory...")
                print("✅ Tests moved to main tests/ directory")
            else:
                print("⚠️  No tests found in workspace")

        # Finish workspace (moves tests and cleans up)
        manager.finish_workspace()

        print("🧹 Cleaning up workspace...")
        print(f"✅ Issue #{workspace.issue_number} workspace cleaned up")
        print()
        print("💡 Next steps:")
        print("   - Run 'make test' to verify tests fail (red state)")
        print("   - Implement code to make tests pass (green state)")
        print("   - Start next issue with 'make tdd-start NUM=X'")

    except TddaiError as e:
        print(f"❌ Error: {e}")
        sys.exit(1)


def add_test_guidance():
    """Show guidance for adding tests."""
    try:
        manager = WorkspaceManager()

        workspace = manager.get_current_workspace()
        if not workspace:
            print("❌ No active issue workspace")
            print("   Run 'make tdd-start NUM=X' first")
            sys.exit(1)

        print(f"🧪 Adding test to issue #{workspace.issue_number} workspace")
        print()
        print(f"📋 Issue: {workspace.issue_title}")
        print(f"📁 Workspace: {workspace.workspace_dir}/issue_{workspace.issue_number}/")
        print()
        print("🤖 Please ask Claude Code to generate a test:")
        print()
        print("   Command: 'Generate a test for the current workspace issue'")
        print()
        print("📝 Test Requirements:")
        print(f"   - Save test in: {workspace.tests_dir}/")
        print(f"   - Name format: test_issue_{workspace.issue_number}_<scenario>.py")
        print(f"   - Include docstring referencing issue #{workspace.issue_number}")
        print("   - Follow TDD principles (test should fail initially)")
        print("   - Review requirements.md and test_plan.md for context")
        print()
        print("📋 Issue Details:")
        print(f"   Title: {workspace.issue_title}")
        print(f"   Description: {workspace.issue_body}")
        print()
        print("💡 After generation: Use 'make tdd-status' to see all tests")

    except TddaiError as e:
        print(f"❌ Error: {e}")
        sys.exit(1)


def list_issues():
    """List all issues."""
    try:
        fetcher = IssueFetcher()
        print("📋 MarkiTect Issues")
        print("==================")
        print()

        issues = fetcher.fetch_issues()
        if not issues:
            print("No issues found")
            return

        for issue in issues:
            status_icon = "🟢" if issue.state == "open" else "🔴"
            print(f"{status_icon} #{issue.number}: {issue.title}")
            print(f"   Status: {issue.state.upper()} | Created: {issue.created_at.strftime('%Y-%m-%d')}")

            # Truncate body for list view
            body_preview = issue.body[:80] + "..." if len(issue.body) > 80 else issue.body
            if body_preview:
                print(f"   {body_preview}")
            print()

        print("💡 Tip: Use 'make show-issue NUM=X' for full details")

    except TddaiError as e:
        print(f"❌ Error: {e}")
        sys.exit(1)


def list_open_issues():
    """List only open issues."""
    try:
        fetcher = IssueFetcher()
        print("📋 Open MarkiTect Issues (Active Backlog)")
        print("========================================")
        print()

        issues = fetcher.fetch_open_issues()
        if not issues:
            print("No open issues found")
            return

        for issue in issues:
            print(f"[OPEN] #{issue.number}: {issue.title}")
            print(f"   Created: {issue.created_at.strftime('%Y-%m-%d')} | Updated: {issue.updated_at.strftime('%Y-%m-%d')}")

            # Truncate body for list view
            body_preview = issue.body[:80] + "..." if len(issue.body) > 80 else issue.body
            if body_preview:
                print(f"   {body_preview}")
            print()

        print("💡 Tip: Use 'make show-issue NUM=X' for full details or 'make list-issues' for all issues")

    except TddaiError as e:
        print(f"❌ Error: {e}")
        sys.exit(1)


def analyze_coverage(issue_number: int):
    """Analyze test coverage for a specific issue."""
    try:
        analyzer = CoverageAnalyzer()
        print(f"🔍 Analyzing test coverage for Issue #{issue_number}")
        print("=" * 50)
        print()

        assessment = analyzer.analyze_issue_coverage(issue_number)

        print(f"📋 Issue: #{assessment.issue_number} - {assessment.issue_title}")
        print(f"📊 Coverage: {assessment.coverage_percentage:.1f}%")
        print()

        # Show requirements analysis
        print("🎯 Identified Requirements:")
        if assessment.requirements:
            for req in assessment.requirements:
                priority_icon = {"critical": "🚨", "important": "⚠️", "nice-to-have": "💡"}
                icon = priority_icon.get(req.priority, "📝")
                print(f"   {icon} [{req.priority.upper()}] {req.category}: {req.description}")
        else:
            print("   No specific requirements detected")
        print()

        # Show existing tests
        print("🧪 Existing Test Coverage:")
        issue_related_tests = [t for t in assessment.existing_tests if t.related_issue == issue_number]
        if issue_related_tests:
            for test in issue_related_tests:
                test_count = len(test.test_methods)
                print(f"   ✅ {test.file_path.name} ({test_count} test methods)")
                if test.test_methods:
                    for method in test.test_methods[:3]:  # Show first 3
                        print(f"      - {method}")
                    if len(test.test_methods) > 3:
                        print(f"      - ... and {len(test.test_methods) - 3} more")
        else:
            print("   📝 No tests specifically for this issue found")
            # Show general tests that might be relevant
            relevant_tests = [t for t in assessment.existing_tests
                            if any(keyword in ' '.join(t.coverage_keywords)
                                  for req in assessment.requirements
                                  for keyword in req.keywords)]
            if relevant_tests:
                print("   📋 Potentially relevant tests:")
                for test in relevant_tests[:3]:
                    print(f"      📄 {test.file_path.name}")
        print()

        # Show coverage gaps
        if assessment.coverage_gaps:
            print("❌ Coverage Gaps Found:")
            for gap in assessment.coverage_gaps:
                priority_icon = {"critical": "🚨", "important": "⚠️", "nice-to-have": "💡"}
                icon = priority_icon.get(gap.requirement.priority, "📝")
                print(f"   {icon} Missing: {gap.requirement.description}")
                print(f"      💡 Suggested test: {gap.suggested_test_name}")
                print(f"      📄 Suggested file: {gap.suggested_test_file}")
            print()
        else:
            print("✅ No significant coverage gaps detected!")
            print()

        # Show recommendations
        print("📝 Recommendations:")
        for recommendation in assessment.recommendations:
            print(f"   {recommendation}")

    except TddaiError as e:
        print(f"❌ Error: {e}")
        sys.exit(1)


def show_issue(issue_number: int):
    """Show detailed issue information."""
    try:
        fetcher = IssueFetcher()
        print(f"🔍 Issue #{issue_number} Details")
        print("=======================")
        print()

        issue = fetcher.fetch_issue(issue_number)

        print(f"**Title:** {issue.title}")
        print(f"**Status:** {issue.state.upper()}")
        print(f"**Number:** #{issue.number}")
        print(f"**Created:** {issue.created_at.strftime('%Y-%m-%d %H:%M')}")
        print(f"**Updated:** {issue.updated_at.strftime('%Y-%m-%d %H:%M')}")
        print(f"**URL:** {issue.html_url}")

        if issue.assignee:
            print(f"**Assignee:** {issue.assignee}")

        if issue.labels:
            print(f"**Labels:** {', '.join(issue.labels)}")

        print()
        print("**Description:**")
        print(issue.body)
        print()
        print("💡 Tip: Use 'make list-issues' to see all issues")

    except TddaiError as e:
        print(f"❌ Error: {e}")
        sys.exit(1)


def main():
    """Main CLI entry point."""
    parser = argparse.ArgumentParser(description="tddai CLI tool")
    subparsers = parser.add_subparsers(dest='command', help='Available commands')

    # Workspace commands
    subparsers.add_parser('workspace-status', help='Show workspace status')

    start_parser = subparsers.add_parser('start-issue', help='Start working on issue')
    start_parser.add_argument('issue_number', type=int, help='Issue number')

    subparsers.add_parser('finish-issue', help='Finish current issue')
    subparsers.add_parser('add-test', help='Show guidance for adding tests')

    # Issue commands
    subparsers.add_parser('list-issues', help='List all issues')
    subparsers.add_parser('list-open-issues', help='List open issues')

    show_parser = subparsers.add_parser('show-issue', help='Show issue details')
    show_parser.add_argument('issue_number', type=int, help='Issue number')

    coverage_parser = subparsers.add_parser('analyze-coverage', help='Analyze test coverage for issue')
    coverage_parser.add_argument('issue_number', type=int, help='Issue number')

    args = parser.parse_args()

    if not args.command:
        parser.print_help()
        return

    try:
        if args.command == 'workspace-status':
            workspace_status()
        elif args.command == 'start-issue':
            start_issue(args.issue_number)
        elif args.command == 'finish-issue':
            finish_issue()
        elif args.command == 'add-test':
            add_test_guidance()
        elif args.command == 'list-issues':
            list_issues()
        elif args.command == 'list-open-issues':
            list_open_issues()
        elif args.command == 'show-issue':
            show_issue(args.issue_number)
        elif args.command == 'analyze-coverage':
            analyze_coverage(args.issue_number)
    except KeyboardInterrupt:
        print("\n⚠️  Operation cancelled")
        sys.exit(1)


if __name__ == '__main__':
    main()