┌─────────────────────────────────────────────────────────────────┐
│              CONTENT ACCESS DECISION HIERARCHY                   │
├─────────────────────────────────────────────────────────────────┤
│                                                                  │
│  1. FULLY LEGAL (Always try first)                              │
│     ├─ Library databases (PressReader, ProQuest, JSTOR)         │
│     ├─ Open access tools (Unpaywall, CORE, PubMed Central)     │
│     ├─ Author direct contact                                    │
│     └─ Interlibrary loan                                        │
│                                                                  │
│  2. LEGAL (Browser features)                                    │
│     ├─ Reader Mode (Safari, Firefox, Edge)                      │
│     ├─ Wayback Machine archives                                 │
│     └─ Google Scholar "All versions"                            │
│                                                                  │
│  3. GREY AREA (Use with caution)                               │
│     ├─ Archive.is for individual articles                       │
│     ├─ Disable JavaScript (breaks functionality)                │
│     └─ VPNs for geo-blocked content                            │
│                                                                  │
│  4. NOT RECOMMENDED                                             │
│     ├─ Credential sharing                                       │
│     ├─ Systematic scraping                                      │
│     └─ Commercial use of bypassed content                       │
│                                                                  │
└─────────────────────────────────────────────────────────────────┘

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Args:
    doi: Digital Object Identifier (e.g., "10.1038/nature12373")
    email: Your email for API identification

Returns:
    Dict with best open access URL if available
"""
url = f"https://api.unpaywall.org/v2/{doi}?email={email}"

response = requests.get(url, timeout=30)

if response.status_code != 200:
    return {'error': f'Status {response.status_code}'}

data = response.json()

if data.get('is_oa'):
    best_location = data.get('best_oa_location', {})
    return {
        'is_open_access': True,
        'oa_url': best_location.get('url_for_pdf') or best_location.get('url'),
        'oa_status': data.get('oa_status'),  # gold, green, bronze, hybrid
        'host_type': best_location.get('host_type'),  # publisher, repository
        'version': best_location.get('version')  # publishedVersion, acceptedVersion
    }

return {
    'is_open_access': False,
    'title': data.get('title'),
    'journal': data.get('journal_name')
}

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def search(self, query: str, limit: int = 10) -> list:
    """Search CORE database for open access papers."""

    headers = {'Authorization': f'Bearer {self.api_key}'}
    params = {
        'q': query,
        'limit': limit
    }

    response = requests.get(
        f"{self.base_url}/search/works",
        headers=headers,
        params=params,
        timeout=30
    )

    if response.status_code != 200:
        return []

    data = response.json()
    results = []

    for item in data.get('results', []):
        results.append({
            'title': item.get('title'),
            'authors': [a.get('name') for a in item.get('authors', [])],
            'year': item.get('yearPublished'),
            'doi': item.get('doi'),
            'download_url': item.get('downloadUrl'),
            'abstract': item.get('abstract', '')[:500]
        })

    return results

def get_by_doi(self, doi: str) -> dict:
    """Get paper by DOI."""
    headers = {'Authorization': f'Bearer {self.api_key}'}

    response = requests.get(
        f"{self.base_url}/works/{doi}",
        headers=headers,
        timeout=30
    )

    return response.json() if response.status_code == 200 else {}

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url = "https://api.semanticscholar.org/graph/v1/paper/search"
params = {
    'query': query,
    'limit': limit,
    'fields': 'title,authors,year,abstract,openAccessPdf,citationCount'
}

response = requests.get(url, params=params, timeout=30)

if response.status_code != 200:
    return []

results = []
for paper in response.json().get('data', []):
    oa_pdf = paper.get('openAccessPdf', {})
    results.append({
        'title': paper.get('title'),
        'authors': [a.get('name') for a in paper.get('authors', [])],
        'year': paper.get('year'),
        'citations': paper.get('citationCount', 0),
        'open_access_url': oa_pdf.get('url') if oa_pdf else None,
        'abstract': paper.get('abstract', '')[:500] if paper.get('abstract') else ''
    })

return results

response = requests.get(url, params=params, timeout=30)
return response.json() if response.status_code == 200 else {}

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// Bookmarklet to trigger Firefox-style reader mode
// Works on some soft paywalls that load content before blocking

javascript:(function(){
    // Try to extract article content
    var article = document.querySelector('article') ||
                  document.querySelector('[role="main"]') ||
                  document.querySelector('.article-body') ||
                  document.querySelector('.post-content');

    if (article) {
        // Remove paywall overlays
        document.querySelectorAll('[class*="paywall"], [class*="subscribe"], [id*="paywall"]')
            .forEach(el => el.remove());

        // Remove fixed position overlays
        document.querySelectorAll('*').forEach(el => {
            var style = getComputedStyle(el);
            if (style.position === 'fixed' && style.zIndex > 100) {
                el.remove();
            }
        });

        // Re-enable scrolling
        document.body.style.overflow = 'auto';
        document.documentElement.style.overflow = 'auto';

        console.log('Overlay removed. Content may now be visible.');
    }
})();

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# Common library database endpoints
DATABASES = {
    'pressreader': {
        'base': 'https://www.pressreader.com',
        'auth': 'library_card',
        'content': '7000+ newspapers/magazines'
    },
    'proquest': {
        'base': 'https://www.proquest.com',
        'auth': 'institutional',
        'content': 'news, dissertations, documents'
    },
    'jstor': {
        'base': 'https://www.jstor.org',
        'auth': 'institutional',
        'content': 'academic journals, books'
    },
    'nexis_uni': {
        'base': 'https://www.nexisuni.com',
        'auth': 'institutional',
        'content': 'legal, news, business'
    }
}

@staticmethod
def get_pressreader_access_methods():
    """Ways to access PressReader through libraries."""
    return {
        'in_library': 'Connect to library WiFi, visit pressreader.com',
        'remote': 'Log in with library card credentials',
        'app': 'Download PressReader app, link library card',
        'note': 'Access typically 30-48 hours per session'
    }

ILL is free through most libraries and can get almost any paper.
Turnaround: typically 3-7 days.
"""

request = f"""
INTERLIBRARY LOAN REQUEST

Title: {paper_info.get('title')}
Author(s): {paper_info.get('authors')}
Journal: {paper_info.get('journal')}
Year: {paper_info.get('year')}
DOI: {paper_info.get('doi')}
Volume/Issue: {paper_info.get('volume')}/{paper_info.get('issue')}
Pages: {paper_info.get('pages')}

Requested by: {library_email}
"""

return request.strip()

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import requests

def check_geo_access(url: str, regions: list = None) -> dict:
    """Check if URL is accessible from different regions.

    Note: This requires VPN/proxy services for actual testing.
    This function shows the concept.
    """

    regions = regions or ['US', 'UK', 'EU', 'JP', 'AU']

    results = {}

    # Direct access test
    try:
        response = requests.get(url, timeout=10)
        results['direct'] = {
            'accessible': response.status_code == 200,
            'status_code': response.status_code
        }
    except Exception as e:
        results['direct'] = {'accessible': False, 'error': str(e)}

    # Would need VPN/proxy integration for regional testing
    # results[region] = test_through_proxy(url, region)

    return results

import requests
from urllib.parse import quote

def get_archived_article(url: str) -> str:
    """Try to get article from Archive.today.

    Archive.today often captures full article content
    because it renders JavaScript and captures the result.

    Legal status varies by jurisdiction - use for research purposes.
    """

    # Check for existing archive
    search_url = f"https://archive.today/{quote(url, safe='')}"

    try:
        response = requests.get(search_url, timeout=30, allow_redirects=True)

        if response.status_code == 200 and 'archive.today' in response.url:
            return response.url

        # No existing archive - could request one
        # Note: This may violate ToS, use responsibly
        return None

    except Exception:
        return None

def get_wayback_article(url: str) -> str:
    """Get article from Wayback Machine.

    100% legal - the Internet Archive is a recognized library.
    May have older versions of articles (before paywall implemented).
    """

    # Check availability
    api_url = f"http://archive.org/wayback/available?url={url}"

    try:
        response = requests.get(api_url, timeout=10)
        data = response.json()

        snapshot = data.get('archived_snapshots', {}).get('closest', {})

        if snapshot.get('available'):
            return snapshot['url']

        return None
    except Exception:
        return None

def find_free_via_scholar(title: str) -> list:
    """Search strategies for finding free paper versions.

    Google Scholar often links to:
    - Author's personal website copies
    - Institutional repository versions
    - ResearchGate/Academia.edu uploads
    """

    strategies = [
        {
            'method': 'scholar_all_versions',
            'description': 'Click "All X versions" under result',
            'success_rate': 'Medium-High'
        },
        {
            'method': 'scholar_pdf_link',
            'description': 'Look for [PDF] link on right side',
            'success_rate': 'Medium'
        },
        {
            'method': 'title_plus_pdf',
            'description': f'Search: "{title}" filetype:pdf',
            'success_rate': 'Medium'
        },
        {
            'method': 'author_site',
            'description': 'Find author\'s academic page',
            'success_rate': 'Medium'
        },
        {
            'method': 'preprint_servers',
            'description': 'Search arXiv, SSRN, bioRxiv',
            'success_rate': 'Field-dependent'
        }
    ]

    return strategies

def generate_paper_request_email(paper: dict, requester: dict) -> str:
    """Generate professional email requesting paper from author.

    Authors are typically happy to share their work.
    Success rate: Very high (70-90%).
    """

    template = f"""
Subject: Request for paper: {paper['title'][:50]}...

Dear Dr./Prof. {paper['author_last_name']},

I am a {requester['role']} at {requester['institution']}, researching
{requester['research_area']}.

I came across your paper "{paper['title']}" published in
{paper['journal']} ({paper['year']}), and I believe it would be
highly relevant to my work on {requester['specific_project']}.

Unfortunately, I don't have access through my institution. Would you
be willing to share a copy?

I would be happy to properly cite your work in any resulting publications.

Thank you for your time and for your contribution to the field.

Best regards,
{requester['name']}
{requester['title']}
{requester['institution']}
{requester['email']}
"""

    return template.strip()

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