#!/usr/bin/env python3
import json
import sys
from datetime import date
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
BACKLOG = ROOT / 'backlog' / 'features.json'
TYPE_CHOICES = ('feature', 'fix', 'bug', 'chore')
LEVEL_CHOICES = ('low', 'med', 'high')


def ask(prompt, default=''):
    value = input(f"{prompt}{' [' + default + ']' if default else ''}: ").strip()
    return value if value else default


def ask_choice(prompt, choices, default):
    while True:
        value = ask(prompt, default).lower()
        if value in choices:
            return value
        print(f"Invalid value. Use one of: {', '.join(choices)}")


def ask_list(prompt, default_csv=''):
    raw = ask(prompt, default_csv)
    return [item.strip() for item in raw.split(',') if item.strip()]


def next_id(features):
    nums = []
    for feature in features:
        fid = str(feature.get('id', ''))
        if fid.startswith('F-') and fid[2:].isdigit():
            nums.append(int(fid[2:]))
    return f"F-{(max(nums) + 1) if nums else 1:03d}"


def normalize_deprecated_gates(data):
    """Replace the legacy `review` gate key without changing feature state."""
    changed = 0
    for feature in data.get('features', []):
        gates = feature.get('gates')
        if not isinstance(gates, dict) or 'review' not in gates:
            continue
        gates.setdefault('reviewer', gates['review'])
        del gates['review']
        changed += 1
    return changed


def start_feature(data, feature_id):
    """Promote one pending feature to in_progress while enforcing exclusivity."""
    active = [
        feature.get('id')
        for feature in data.get('features', [])
        if feature.get('status') == 'in_progress' and feature.get('id') != feature_id
    ]
    if active:
        raise SystemExit(f"Cannot start {feature_id}; already in progress: {', '.join(active)}")
    for feature in data.get('features', []):
        if feature.get('id') != feature_id:
            continue
        if feature.get('status') not in {'pending', 'in_progress'}:
            raise SystemExit(f"Cannot start {feature_id} from status {feature.get('status')}")
        feature['status'] = 'in_progress'
        return
    raise SystemExit(f'Feature not found: {feature_id}')


def main():
    data = json.loads(BACKLOG.read_text(encoding='utf-8'))
    if '--normalize-gates' in sys.argv[1:]:
        changed = normalize_deprecated_gates(data)
        BACKLOG.write_text(json.dumps(data, indent=2, ensure_ascii=False) + '\n', encoding='utf-8')
        print(f'Normalized deprecated gates in {changed} feature(s)')
        return
    if '--start' in sys.argv[1:]:
        index = sys.argv.index('--start')
        if index + 1 >= len(sys.argv):
            raise SystemExit('Usage: new_ticket.py --start <feature_id>')
        feature_id = sys.argv[index + 1]
        start_feature(data, feature_id)
        BACKLOG.write_text(json.dumps(data, indent=2, ensure_ascii=False) + '\n', encoding='utf-8')
        print(f'Started {feature_id}')
        return

    # CLI flags (non-interactive mode)
    cli_args = sys.argv[1:]
    if any(a.startswith('--id') or a.startswith('--type') for a in cli_args):
        import argparse
        p = argparse.ArgumentParser(add_help=False)
        p.add_argument('--id')
        p.add_argument('--type', choices=TYPE_CHOICES, default='fix')
        p.add_argument('--title', default='Fix TODO')
        p.add_argument('--description', default='Need change')
        p.add_argument('--priority', choices=LEVEL_CHOICES, default='med')
        p.add_argument('--risk', choices=LEVEL_CHOICES, default='low')
        p.add_argument('--phase', default=None)
        ns, _ = p.parse_known_args(cli_args)
        features = data['features']
        fid = ns.id or next_id(features)
        new_feature = {
            'id': fid,
            'type': ns.type,
            'title': ns.title,
            'description': ns.description,
            'priority': ns.priority,
            'risk': ns.risk,
            'status': 'pending',
            'created_at': str(date.today()),
            'gates': {'reviewer': False, 'security': False, 'qa': False},
        }
        if ns.phase:
            new_feature['phase'] = ns.phase
        features.append(new_feature)
        data['features'] = features
        BACKLOG.write_text(json.dumps(data, indent=2, ensure_ascii=False) + '\n', encoding='utf-8')
        print(f'Created {fid}: {ns.title}')
        return

    features = data.get('features', [])

    print('Create ticket (English caveman style).')
    ticket_type = ask_choice('Type (feature/fix/bug/chore)', TYPE_CHOICES, 'feature')
    title = ask('Title (short EN)', f'{ticket_type.capitalize()} TODO')
    problem = ask('Problem (short EN)', 'Need change')
    goal = ask('Goal (short EN)', 'Make flow better')
    scope_in = ask_list('Scope IN (comma list EN)', 'Core flow')
    scope_out = ask_list('Scope OUT (comma list EN)', 'No redesign')
    risk = ask_choice('Risk (low/med/high)', LEVEL_CHOICES, 'low')
    priority = ask_choice('Priority (low/med/high)', LEVEL_CHOICES, 'med')

    print('Acceptance bullets (EN caveman). Empty line to end.')
    acceptance = []
    while True:
        line = input('- ').strip()
        if not line:
            break
        acceptance.append(line)

    if not acceptance:
        acceptance = [
            'Flow works end to end',
            'No break old behavior',
            'verify.sh is green',
        ]

    fid = next_id(features)
    desc = (
        f"Problem: {problem}. "
        f"Goal: {goal}. "
        f"Scope IN: {', '.join(scope_in) or 'none'}. "
        f"Scope OUT: {', '.join(scope_out) or 'none'}. "
        f"Type: {ticket_type}. Priority: {priority}. Risk: {risk}."
    )

    features.append({
        'id': fid,
        'type': ticket_type,
        'title': title,
        'problem': problem,
        'goal': goal,
        'scope_in': scope_in,
        'scope_out': scope_out,
        'priority': priority,
        'risk': risk,
        'description': desc,
        'acceptance': acceptance,
        'status': 'pending',
        'created_at': str(date.today()),
        'gates': {'reviewer': False, 'security': False, 'qa': False},
    })

    data['features'] = features
    rules = data.setdefault('rules', {})
    rules.setdefault('valid_types', list(TYPE_CHOICES))
    BACKLOG.write_text(json.dumps(data, indent=2, ensure_ascii=False) + '\n', encoding='utf-8')
    print(f'Created {fid}: {title}')


if __name__ == '__main__':
    main()