#!/usr/bin/env perl
use strict;
use warnings;
use Test2::V0;
use Test2::Plugin::SubtestFilter;

# This test simulates a complicated, large test file
# with many nested subtests, various syntax styles, and deep nesting levels.

subtest 'API Endpoints' => sub {
    subtest 'GET /api/users' => sub {
        subtest 'with valid parameters' => sub {
            ok 1, 'returns 200';
            ok 1, 'returns user list';
        };
        subtest 'with invalid parameters' => sub {
            ok 1, 'returns 400';
        };
        subtest 'with authentication' => sub {
            subtest 'valid token' => sub {
                ok 1, 'returns user data';
            };
            subtest 'invalid token' => sub {
                ok 1, 'returns 401';
            };
            subtest 'expired token' => sub {
                ok 1, 'returns 401';
            };
        };
    };

    subtest 'POST /api/users' => sub {
        subtest 'with valid data' => sub {
            ok 1, 'creates user';
            ok 1, 'returns 201';
        };
        subtest 'with invalid data' => sub {
            subtest 'missing required fields' => sub {
                ok 1, 'returns 400';
            };
            subtest 'invalid email format' => sub {
                ok 1, 'returns 400';
            };
        };
        subtest 'with duplicate email' => sub {
            ok 1, 'returns 409';
        };
    };

    subtest 'PUT /api/users/:id' => sub {
        subtest 'with valid data' => sub {
            ok 1, 'updates user';
            ok 1, 'returns 200';
        };
        subtest 'with non-existent id' => sub {
            ok 1, 'returns 404';
        };
    };

    subtest 'DELETE /api/users/:id' => sub {
        subtest 'existing user' => sub {
            ok 1, 'deletes user';
            ok 1, 'returns 204';
        };
        subtest 'non-existent user' => sub {
            ok 1, 'returns 404';
        };
    };
};

subtest 'Database Operations' => sub {
    subtest 'User Model' => sub {
        subtest 'create' => sub {
            ok 1, 'inserts record';
            ok 1, 'returns user object';
        };
        subtest 'find' => sub {
            subtest 'by id' => sub {
                ok 1, 'finds user';
            };
            subtest 'by email' => sub {
                ok 1, 'finds user';
            };
            subtest 'with non-existent id' => sub {
                ok 1, 'returns undef';
            };
        };
        subtest 'update' => sub {
            ok 1, 'updates record';
        };
        subtest 'delete' => sub {
            ok 1, 'deletes record';
        };
    };

    subtest 'Post Model' => sub {
        subtest 'create' => sub {
            ok 1, 'inserts record';
        };
        subtest 'find_by_user' => sub {
            subtest 'with posts' => sub {
                ok 1, 'returns posts';
            };
            subtest 'without posts' => sub {
                ok 1, 'returns empty array';
            };
        };
        subtest 'delete_cascade' => sub {
            ok 1, 'deletes post and comments';
        };
    };

    subtest 'Transaction Handling' => sub {
        subtest 'commit' => sub {
            ok 1, 'saves changes';
        };
        subtest 'rollback' => sub {
            ok 1, 'reverts changes';
        };
        subtest 'nested transactions' => sub {
            subtest 'outer commit, inner commit' => sub {
                ok 1, 'both saved';
            };
            subtest 'outer commit, inner rollback' => sub {
                ok 1, 'inner reverted';
            };
            subtest 'outer rollback' => sub {
                ok 1, 'all reverted';
            };
        };
    };
};

subtest 'Authentication System' => sub {
    subtest 'Login' => sub {
        subtest 'with valid credentials' => sub {
            ok 1, 'creates session';
            ok 1, 'returns token';
        };
        subtest 'with invalid credentials' => sub {
            ok 1, 'returns 401';
        };
        subtest 'with locked account' => sub {
            ok 1, 'returns 403';
        };
    };

    subtest 'Logout' => sub {
        ok 1, 'destroys session';
    };

    subtest 'Token Validation' => sub {
        subtest 'valid token' => sub {
            ok 1, 'authenticates user';
        };
        subtest 'expired token' => sub {
            ok 1, 'returns 401';
        };
        subtest 'malformed token' => sub {
            ok 1, 'returns 401';
        };
    };

    subtest 'Password Reset' => sub {
        subtest 'request reset' => sub {
            ok 1, 'sends email';
            ok 1, 'generates token';
        };
        subtest 'reset with valid token' => sub {
            ok 1, 'updates password';
        };
        subtest 'reset with invalid token' => sub {
            ok 1, 'returns 400';
        };
    };
};

subtest 'Validation Layer' => sub {
    subtest 'Email Validation' => sub {
        subtest 'valid formats' => sub {
            ok 1, 'user@example.com';
            ok 1, 'user.name@example.co.jp';
        };
        subtest 'invalid formats' => sub {
            ok 1, 'rejects @example.com';
            ok 1, 'rejects user@';
            ok 1, 'rejects plaintext';
        };
    };

    subtest 'Password Validation' => sub {
        subtest 'strong passwords' => sub {
            ok 1, 'accepts mixed case';
            ok 1, 'accepts with numbers';
            ok 1, 'accepts with symbols';
        };
        subtest 'weak passwords' => sub {
            ok 1, 'rejects too short';
            ok 1, 'rejects common passwords';
        };
    };

    subtest 'Input Sanitization' => sub {
        subtest 'HTML tags' => sub {
            ok 1, 'removes script tags';
            ok 1, 'escapes special chars';
        };
        subtest 'SQL injection' => sub {
            ok 1, 'escapes quotes';
            ok 1, 'parameterizes queries';
        };
    };
};

subtest 'File Upload' => sub {
    subtest 'Image Upload' => sub {
        subtest 'valid images' => sub {
            ok 1, 'accepts JPEG';
            ok 1, 'accepts PNG';
            ok 1, 'accepts GIF';
        };
        subtest 'invalid files' => sub {
            ok 1, 'rejects executables';
            ok 1, 'rejects oversized files';
        };
        subtest 'image processing' => sub {
            subtest 'thumbnail generation' => sub {
                ok 1, 'creates thumbnail';
            };
            subtest 'resize' => sub {
                ok 1, 'resizes image';
            };
        };
    };

    subtest 'Document Upload' => sub {
        ok 1, 'accepts PDF';
        ok 1, 'accepts DOC';
    };
};

subtest 'Caching Layer' => sub {
    subtest 'Cache Hit' => sub {
        ok 1, 'returns cached data';
    };
    subtest 'Cache Miss' => sub {
        ok 1, 'fetches from database';
        ok 1, 'stores in cache';
    };
    subtest 'Cache Invalidation' => sub {
        subtest 'on update' => sub {
            ok 1, 'clears cache';
        };
        subtest 'on delete' => sub {
            ok 1, 'clears cache';
        };
        subtest 'TTL expiration' => sub {
            ok 1, 'expires after TTL';
        };
    };
};

subtest 'Error Handling' => sub {
    subtest 'HTTP Errors' => sub {
        subtest '400 Bad Request' => sub {
            ok 1, 'returns error message';
        };
        subtest '404 Not Found' => sub {
            ok 1, 'returns error message';
        };
        subtest '500 Internal Server Error' => sub {
            ok 1, 'logs error';
            ok 1, 'returns generic message';
        };
    };

    subtest 'Database Errors' => sub {
        subtest 'connection failure' => sub {
            ok 1, 'retries connection';
        };
        subtest 'query timeout' => sub {
            ok 1, 'returns error';
        };
        subtest 'constraint violation' => sub {
            ok 1, 'returns 409';
        };
    };
};

subtest 'Background Jobs' => sub {
    subtest 'Email Queue' => sub {
        subtest 'enqueue' => sub {
            ok 1, 'adds to queue';
        };
        subtest 'process' => sub {
            subtest 'successful send' => sub {
                ok 1, 'marks as sent';
            };
            subtest 'failed send' => sub {
                ok 1, 'retries';
            };
        };
    };

    subtest 'Report Generation' => sub {
        subtest 'daily report' => sub {
            ok 1, 'generates report';
        };
        subtest 'monthly report' => sub {
            ok 1, 'generates report';
        };
    };
};

subtest 'Integration Tests' => sub {
    subtest 'User Registration Flow' => sub {
        subtest 'complete flow' => sub {
            ok 1, 'registers user';
            ok 1, 'sends confirmation email';
            ok 1, 'activates account';
        };
        subtest 'with errors' => sub {
            ok 1, 'handles validation errors';
            ok 1, 'handles duplicate email';
        };
    };

    subtest 'Purchase Flow' => sub {
        subtest 'successful purchase' => sub {
            ok 1, 'creates order';
            ok 1, 'processes payment';
            ok 1, 'sends confirmation';
        };
        subtest 'failed payment' => sub {
            ok 1, 'rolls back order';
            ok 1, 'notifies user';
        };
    };
};

subtest 'Performance Tests' => sub {
    subtest 'Response Time' => sub {
        ok 1, 'under 100ms for simple queries';
        ok 1, 'under 500ms for complex queries';
    };

    subtest 'Concurrent Requests' => sub {
        subtest '10 concurrent users' => sub {
            ok 1, 'handles load';
        };
        subtest '100 concurrent users' => sub {
            ok 1, 'handles load';
        };
        subtest '1000 concurrent users' => sub {
            ok 1, 'handles load with degradation';
        };
    };

    subtest 'Memory Usage' => sub {
        ok 1, 'stays under threshold';
    };
};

done_testing;
