import json
from pathlib import Path
import shutil
import subprocess
import sys
import tempfile
import unittest

ROOT = Path(__file__).resolve().parents[1]
SCRIPT = ROOT / 'scripts/install-unified-skills.py'


class UnifiedSkillInstallerTests(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.TemporaryDirectory();self.addCleanup(self.tmp.cleanup)
        self.root = Path(self.tmp.name)

    def run_cmd(self, command, skill, target, out, plan=None):
        selection = ['--component', 'research-runtime'] if skill == 'ksf-voc-library' else ['--skill', skill]
        argv = [sys.executable, '-B', '-X', 'utf8', str(SCRIPT), command, *selection, '--target', str(target), '--out', str(out)]
        if plan:
            argv += ['--plan', str(plan)]
        result = subprocess.run(argv, capture_output=True, encoding='utf-8')
        return result.returncode, json.loads(result.stdout)

    def target(self, skill):
        dest = self.root / skill
        shutil.copytree(ROOT / 'skills' / skill, dest)
        (dest / 'SKILL.md').write_text('previous-entry', encoding='utf-8')
        (dest / 'extra-local-file').write_text('preserve', encoding='utf-8')
        return dest

    def test_plan_apply_verify_preserve_other_files_and_business_code(self):
        for skill in ('ksf-voc-library', 'ksf-workshop-runtime'):
            target = self.target(skill)
            plans, applied = self.root / (skill + '-plan'), self.root / (skill + '-apply')
            self.assertEqual(self.run_cmd('plan', skill, target, plans)[0], 0)
            self.assertEqual((target / 'SKILL.md').read_text(), 'previous-entry')
            self.assertEqual(self.run_cmd('apply', skill, target, applied, plans / 'plan.json')[0], 0)
            self.assertEqual((applied / 'before/SKILL.md').read_text(), 'previous-entry')
            self.assertEqual((target / 'extra-local-file').read_text(), 'preserve')
            self.assertEqual(self.run_cmd('verify', skill, target, self.root / (skill + '-verify'))[0], 0)
            if skill == 'ksf-voc-library':
                self.assertFalse((target / 'SKILL.md').exists())
                self.assertNotIn('SKILL.md', (target / 'FILES.sha256').read_text())
            else:
                self.assertTrue((target / 'SKILL.md').exists())

    def test_already_merged_research_runtime_needs_no_skill_entry(self):
        skill = 'ksf-voc-library';target = self.target(skill)
        (target / 'SKILL.md').unlink()
        plans, applied = self.root / 'runtime-plan', self.root / 'runtime-apply'
        self.assertEqual(self.run_cmd('plan', skill, target, plans)[0], 0)
        self.assertEqual(self.run_cmd('apply', skill, target, applied, plans / 'plan.json')[0], 0)
        self.assertFalse((target / 'SKILL.md').exists())
        self.assertEqual(self.run_cmd('verify', skill, target, self.root / 'runtime-verify')[0], 0)

    def test_concurrent_change_and_protected_runtime_mismatch_stop_before_mutation(self):
        skill = 'ksf-workshop-runtime';target = self.target(skill)
        plans = self.root / 'plan'
        self.assertEqual(self.run_cmd('plan', skill, target, plans)[0], 0)
        (target / 'SKILL.md').write_text('concurrent-change', encoding='utf-8')
        self.assertNotEqual(self.run_cmd('apply', skill, target, self.root / 'apply', plans / 'plan.json')[0], 0)
        self.assertEqual((target / 'SKILL.md').read_text(), 'concurrent-change')
        protected = target / 'scripts/ksf-secure.mjs'
        protected.write_text('changed-runtime', encoding='utf-8')
        code, result = self.run_cmd('plan', skill, target, self.root / 'plan-bad-runtime')
        self.assertNotEqual(code, 0)
        self.assertEqual(result['error']['code'], 'PROTECTED_BUSINESS_RUNTIME_MISMATCH')


if __name__ == '__main__':
    unittest.main()