import json
import logging
from odoo import http
from odoo.http import request
from odoo.addons.encoach_api.controllers.base import (
    jwt_required, _json_response, _error_response, _get_json_body, _paginate
)

_logger = logging.getLogger(__name__)

TAXONOMY_MODELS = {
    'subject': 'encoach.subject',
    'domain': 'encoach.domain',
    'topic': 'encoach.topic',
    'learning_objective': 'encoach.learning.objective',
}

PARENT_FIELD_MAP = {
    'domain': 'subject_id',
    'topic': 'domain_id',
    'learning_objective': 'topic_id',
}


def _subject_dict(s):
    return {
        'id': s.id,
        'name': s.name,
        'code': s.code or '',
        'description': s.description or '',
        'is_active': s.active,
        'active': s.active,
        'domain_count': len(s.domain_ids),
        'topic_count': sum(len(d.topic_ids) for d in s.domain_ids),
        'course_count': s.course_count if hasattr(s, 'course_count') else 0,
        'resource_count': s.resource_count if hasattr(s, 'resource_count') else 0,
        'mastery_threshold': 80,
        'grading_scale': 'percentage',
        'diagnostic_config': {
            'questions_per_domain': 5,
            'total_question_cap': 30,
            'time_limit_minutes': 45,
            'starting_difficulty': 'medium',
            'mastery_per_correct': 10,
            'mastery_per_incorrect': -5,
        },
    }


def _domain_dict(d):
    return {
        'id': d.id,
        'name': d.name,
        'code': '',
        'subject_id': d.subject_id.id,
        'subject_name': d.subject_id.name,
        'sequence': d.sequence,
        'description': d.description or '',
        'topic_count': len(d.topic_ids),
    }


def _topic_dict(t):
    return {
        'id': t.id,
        'name': t.name,
        'code': '',
        'domain_id': t.domain_id.id,
        'domain_name': t.domain_id.name,
        'description': t.description or '',
        'difficulty_level': 'medium',
        'estimated_hours': 1,
        'prerequisite_ids': [],
        'prerequisite_names': [],
        'question_type_weights': {},
        'objective_count': len(t.learning_objective_ids),
        'resource_count': t.resource_count if hasattr(t, 'resource_count') else 0,
        'chapter_count': t.chapter_count if hasattr(t, 'chapter_count') else 0,
    }


def _objective_dict(o):
    return {
        'id': o.id,
        'name': o.name,
        'topic_id': o.topic_id.id,
        'bloom_level': o.bloom_level or 'remember',
        'sequence': o.sequence if hasattr(o, 'sequence') else 0,
    }


class EncoachTaxonomyController(http.Controller):

    # ══════════════════════════════════════════════════════════════════
    # SUBJECTS  /api/subjects
    # ══════════════════════════════════════════════════════════════════

    @http.route(['/api/subjects', '/api/taxonomy/subjects'], type='http',
                auth='public', methods=['GET'], csrf=False)
    @jwt_required
    def list_subjects(self, **kw):
        try:
            recs = request.env['encoach.subject'].sudo().search([])
            items = [_subject_dict(s) for s in recs]
            return _json_response({'data': items, 'subjects': items})
        except Exception as e:
            _logger.exception('list_subjects')
            return _error_response(str(e), 500)

    @http.route('/api/subjects/<int:sid>', type='http',
                auth='public', methods=['GET'], csrf=False)
    @jwt_required
    def get_subject(self, sid, **kw):
        try:
            rec = request.env['encoach.subject'].sudo().browse(sid)
            if not rec.exists():
                return _error_response('Subject not found', 404)
            return _json_response({'data': _subject_dict(rec)})
        except Exception as e:
            return _error_response(str(e), 500)

    @http.route('/api/subjects', type='http', auth='public',
                methods=['POST'], csrf=False)
    @jwt_required
    def create_subject(self, **kw):
        try:
            body = _get_json_body()
            vals = {'name': body.get('name', ''), 'code': body.get('code', '')}
            if body.get('description'):
                vals['description'] = body['description']
            rec = request.env['encoach.subject'].sudo().create(vals)
            return _json_response(_subject_dict(rec), 201)
        except Exception as e:
            return _error_response(str(e), 500)

    @http.route('/api/subjects/<int:sid>', type='http', auth='public',
                methods=['PATCH', 'PUT'], csrf=False)
    @jwt_required
    def update_subject(self, sid, **kw):
        try:
            rec = request.env['encoach.subject'].sudo().browse(sid)
            if not rec.exists():
                return _error_response('Not found', 404)
            body = _get_json_body()
            vals = {}
            for k in ('name', 'code', 'description'):
                if k in body:
                    vals[k] = body[k]
            if 'is_active' in body:
                vals['active'] = bool(body['is_active'])
            if vals:
                rec.write(vals)
            return _json_response(_subject_dict(rec))
        except Exception as e:
            return _error_response(str(e), 500)

    @http.route('/api/subjects/<int:sid>', type='http', auth='public',
                methods=['DELETE'], csrf=False)
    @jwt_required
    def delete_subject(self, sid, **kw):
        try:
            rec = request.env['encoach.subject'].sudo().browse(sid)
            if rec.exists():
                rec.unlink()
            return _json_response({'success': True})
        except Exception as e:
            return _error_response(str(e), 500)

    @http.route('/api/subjects/<int:sid>/taxonomy', type='http',
                auth='public', methods=['GET'], csrf=False)
    @jwt_required
    def get_subject_taxonomy(self, sid, **kw):
        try:
            s = request.env['encoach.subject'].sudo().browse(sid)
            if not s.exists():
                return _error_response('Subject not found', 404)
            domains = []
            for d in s.domain_ids:
                topics = []
                for t in d.topic_ids:
                    objectives = [_objective_dict(o) for o in t.learning_objective_ids]
                    td = _topic_dict(t)
                    td['objectives'] = objectives
                    topics.append(td)
                dd = _domain_dict(d)
                dd['topics'] = topics
                domains.append(dd)
            result = _subject_dict(s)
            result['domains'] = domains
            return _json_response({'data': {'subject': _subject_dict(s), 'domains': domains}})
        except Exception as e:
            _logger.exception('get_subject_taxonomy')
            return _error_response(str(e), 500)

    # ══════════════════════════════════════════════════════════════════
    # DOMAINS  /api/domains
    # ══════════════════════════════════════════════════════════════════

    @http.route('/api/domains', type='http', auth='public',
                methods=['GET'], csrf=False)
    @jwt_required
    def list_domains(self, **kw):
        try:
            domain_filter = []
            if kw.get('subject_id'):
                domain_filter.append(('subject_id', '=', int(kw['subject_id'])))
            recs = request.env['encoach.domain'].sudo().search(domain_filter)
            return _json_response({'data': [_domain_dict(d) for d in recs]})
        except Exception as e:
            return _error_response(str(e), 500)

    @http.route('/api/domains', type='http', auth='public',
                methods=['POST'], csrf=False)
    @jwt_required
    def create_domain(self, **kw):
        try:
            body = _get_json_body()
            vals = {
                'name': body.get('name', ''),
                'subject_id': int(body['subject_id']),
            }
            if body.get('description'):
                vals['description'] = body['description']
            rec = request.env['encoach.domain'].sudo().create(vals)
            return _json_response(_domain_dict(rec), 201)
        except Exception as e:
            return _error_response(str(e), 500)

    @http.route('/api/domains/<int:did>', type='http', auth='public',
                methods=['PATCH', 'PUT'], csrf=False)
    @jwt_required
    def update_domain(self, did, **kw):
        try:
            rec = request.env['encoach.domain'].sudo().browse(did)
            if not rec.exists():
                return _error_response('Not found', 404)
            body = _get_json_body()
            vals = {}
            for k in ('name', 'description'):
                if k in body:
                    vals[k] = body[k]
            if vals:
                rec.write(vals)
            return _json_response(_domain_dict(rec))
        except Exception as e:
            return _error_response(str(e), 500)

    @http.route('/api/domains/<int:did>', type='http', auth='public',
                methods=['DELETE'], csrf=False)
    @jwt_required
    def delete_domain(self, did, **kw):
        try:
            rec = request.env['encoach.domain'].sudo().browse(did)
            if rec.exists():
                rec.unlink()
            return _json_response({'success': True})
        except Exception as e:
            return _error_response(str(e), 500)

    @http.route('/api/domains/<int:did>/ai-suggest', type='http',
                auth='public', methods=['POST'], csrf=False)
    @jwt_required
    def ai_suggest_topics(self, did, **kw):
        try:
            domain = request.env['encoach.domain'].sudo().browse(did)
            if not domain.exists():
                return _error_response('Domain not found', 404)
            suggestions = [
                {'name': f'{domain.name} - Fundamentals', 'difficulty_level': 'easy', 'estimated_hours': 2},
                {'name': f'{domain.name} - Intermediate Concepts', 'difficulty_level': 'medium', 'estimated_hours': 3},
                {'name': f'{domain.name} - Advanced Topics', 'difficulty_level': 'hard', 'estimated_hours': 4},
            ]
            return _json_response({'suggestions': suggestions})
        except Exception as e:
            return _error_response(str(e), 500)

    # ══════════════════════════════════════════════════════════════════
    # TOPICS  /api/topics
    # ══════════════════════════════════════════════════════════════════

    @http.route('/api/topics', type='http', auth='public',
                methods=['GET'], csrf=False)
    @jwt_required
    def list_topics(self, **kw):
        try:
            domain_filter = []
            if kw.get('domain_id'):
                domain_filter.append(('domain_id', '=', int(kw['domain_id'])))
            if kw.get('subject_id'):
                domains = request.env['encoach.domain'].sudo().search([('subject_id', '=', int(kw['subject_id']))])
                domain_filter.append(('domain_id', 'in', domains.ids))
            recs = request.env['encoach.topic'].sudo().search(domain_filter)
            return _json_response({'data': [_topic_dict(t) for t in recs]})
        except Exception as e:
            return _error_response(str(e), 500)

    @http.route('/api/topics', type='http', auth='public',
                methods=['POST'], csrf=False)
    @jwt_required
    def create_topic(self, **kw):
        try:
            body = _get_json_body()
            vals = {
                'name': body.get('name', ''),
                'domain_id': int(body['domain_id']),
            }
            if body.get('description'):
                vals['description'] = body['description']
            rec = request.env['encoach.topic'].sudo().create(vals)
            return _json_response(_topic_dict(rec), 201)
        except Exception as e:
            return _error_response(str(e), 500)

    @http.route('/api/topics/<int:tid>', type='http', auth='public',
                methods=['PATCH', 'PUT'], csrf=False)
    @jwt_required
    def update_topic(self, tid, **kw):
        try:
            rec = request.env['encoach.topic'].sudo().browse(tid)
            if not rec.exists():
                return _error_response('Not found', 404)
            body = _get_json_body()
            vals = {}
            for k in ('name', 'description'):
                if k in body:
                    vals[k] = body[k]
            if vals:
                rec.write(vals)
            return _json_response(_topic_dict(rec))
        except Exception as e:
            return _error_response(str(e), 500)

    @http.route('/api/topics/<int:tid>', type='http', auth='public',
                methods=['DELETE'], csrf=False)
    @jwt_required
    def delete_topic(self, tid, **kw):
        try:
            rec = request.env['encoach.topic'].sudo().browse(tid)
            if rec.exists():
                rec.unlink()
            return _json_response({'success': True})
        except Exception as e:
            return _error_response(str(e), 500)

    # ══════════════════════════════════════════════════════════════════
    # Legacy /api/taxonomy/* routes
    # ══════════════════════════════════════════════════════════════════

    @http.route('/api/taxonomy/tree', type='http', auth='public',
                methods=['GET'], csrf=False)
    @jwt_required
    def get_tree(self, **kw):
        try:
            Subject = request.env['encoach.subject'].sudo()
            subjects = Subject.search([('active', '=', True)])

            tree = []
            for s in subjects:
                domains = []
                for d in s.domain_ids:
                    topics = []
                    for t in d.topic_ids:
                        objectives = []
                        for o in t.learning_objective_ids:
                            objectives.append({
                                'id': o.id,
                                'name': o.name,
                                'bloom_level': o.bloom_level or '',
                                'description': o.description or '',
                            })
                        topics.append({
                            'id': t.id,
                            'name': t.name,
                            'description': t.description or '',
                            'learning_objectives': objectives,
                        })
                    domains.append({
                        'id': d.id,
                        'name': d.name,
                        'description': d.description or '',
                        'topics': topics,
                    })
                tree.append({
                    'id': s.id,
                    'name': s.name,
                    'code': s.code or '',
                    'description': s.description or '',
                    'domains': domains,
                })

            return _json_response({'tree': tree})

        except Exception as e:
            _logger.exception('get_tree failed')
            return _error_response(str(e), 500)

    # ------------------------------------------------------------------
    # POST /api/taxonomy/node
    # ------------------------------------------------------------------
    @http.route('/api/taxonomy/node', type='http', auth='none',
                methods=['POST'], csrf=False)
    @jwt_required
    def create_node(self, **kw):
        try:
            body = _get_json_body()
            node_type = body.get('type')
            if not node_type or node_type not in TAXONOMY_MODELS:
                return _error_response(
                    f'type must be one of: {", ".join(TAXONOMY_MODELS.keys())}', 400,
                )

            name = body.get('name')
            if not name:
                return _error_response('name is required', 400)

            model_name = TAXONOMY_MODELS[node_type]
            Model = request.env[model_name].sudo()

            vals = {'name': name}
            if body.get('description'):
                vals['description'] = body['description']

            if node_type == 'subject':
                code = body.get('code')
                if not code:
                    return _error_response('code is required for subjects', 400)
                vals['code'] = code
            else:
                parent_id = body.get('parent_id')
                if not parent_id:
                    parent_field = PARENT_FIELD_MAP[node_type]
                    return _error_response(
                        f'parent_id ({parent_field}) is required for {node_type}', 400,
                    )
                vals[PARENT_FIELD_MAP[node_type]] = int(parent_id)

                if node_type == 'learning_objective' and body.get('bloom_level'):
                    vals['bloom_level'] = body['bloom_level']

            record = Model.create(vals)

            return _json_response({
                'id': record.id,
                'type': node_type,
                'name': record.name,
            }, 201)

        except Exception as e:
            _logger.exception('create_node failed')
            return _error_response(str(e), 500)

    # ------------------------------------------------------------------
    # PUT /api/taxonomy/node/<int:node_id>
    # ------------------------------------------------------------------
    @http.route('/api/taxonomy/node/<int:node_id>', type='http', auth='none',
                methods=['PUT'], csrf=False)
    @jwt_required
    def update_node(self, node_id, **kw):
        try:
            body = _get_json_body()
            node_type = body.get('type')
            if not node_type or node_type not in TAXONOMY_MODELS:
                return _error_response(
                    f'type must be one of: {", ".join(TAXONOMY_MODELS.keys())}', 400,
                )

            model_name = TAXONOMY_MODELS[node_type]
            Model = request.env[model_name].sudo()
            record = Model.browse(node_id)
            if not record.exists():
                return _error_response(f'{node_type} not found', 404)

            vals = {}
            if body.get('name'):
                vals['name'] = body['name']
            if 'description' in body:
                vals['description'] = body.get('description') or ''

            if node_type == 'subject':
                if body.get('code'):
                    vals['code'] = body['code']
                if 'active' in body:
                    vals['active'] = bool(body['active'])
            elif node_type == 'learning_objective' and body.get('bloom_level'):
                vals['bloom_level'] = body['bloom_level']

            if vals:
                record.write(vals)

            return _json_response(record.to_api_dict())

        except Exception as e:
            _logger.exception('update_node failed')
            return _error_response(str(e), 500)

    # ------------------------------------------------------------------
    # DELETE /api/taxonomy/node/<int:node_id>
    # ------------------------------------------------------------------
    @http.route('/api/taxonomy/node/<int:node_id>', type='http', auth='none',
                methods=['DELETE'], csrf=False)
    @jwt_required
    def delete_node(self, node_id, **kw):
        try:
            body = _get_json_body()
            node_type = body.get('type') or kw.get('type')
            if not node_type or node_type not in TAXONOMY_MODELS:
                return _error_response(
                    f'type must be one of: {", ".join(TAXONOMY_MODELS.keys())}', 400,
                )

            model_name = TAXONOMY_MODELS[node_type]
            Model = request.env[model_name].sudo()
            record = Model.browse(node_id)
            if not record.exists():
                return _error_response(f'{node_type} not found', 404)

            record.unlink()
            return _json_response({}, 204)

        except Exception as e:
            _logger.exception('delete_node failed')
            return _error_response(str(e), 500)