"""Unit tests for folder_graph_build (REQ-023–REQ-028)."""
import sys
import os
import pytest
import datetime

sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', 'src'))
from db import StateKV
from functions import folder_observe, folder_graph_build


def make_kv(tmp_path):
    db_path = os.path.join(str(tmp_path), 'test.db')
    return StateKV(db_path=db_path)


def add_obs(kv, folder, agent='kiro', text='obs'):
    folder_observe(kv, {
        'folderPath': folder,
        'agentId': agent,
        'text': text,
        'timestamp': datetime.datetime.utcnow().isoformat() + 'Z',
    })


class TestGraphEmpty:
    def test_empty_kv_returns_empty(self, tmp_path):
        kv = make_kv(tmp_path)
        result = folder_graph_build(kv)
        assert result == {'nodes': [], 'edges': []}


class TestGraphNodes:
    def test_one_node_per_folder(self, tmp_path):
        kv = make_kv(tmp_path)
        add_obs(kv, '/home/user/proj-a', agent='kiro')
        add_obs(kv, '/home/user/proj-a', agent='claude')  # same folder, different agent
        add_obs(kv, '/home/user/proj-b', agent='kiro')
        result = folder_graph_build(kv)
        node_ids = [n['id'] for n in result['nodes']]
        assert len(node_ids) == len(set(node_ids))  # no duplicates
        # 2 unique folders
        assert len(result['nodes']) == 2

    def test_node_has_required_fields(self, tmp_path):
        kv = make_kv(tmp_path)
        add_obs(kv, '/home/user/proj')
        result = folder_graph_build(kv)
        node = result['nodes'][0]
        assert 'id' in node
        assert 'label' in node
        assert 'folderPath' in node
        assert 'agentIds' in node
        assert 'obsCount' in node
        assert 'color' in node

    def test_agent_ids_aggregated(self, tmp_path):
        kv = make_kv(tmp_path)
        add_obs(kv, '/home/user/proj', agent='kiro')
        add_obs(kv, '/home/user/proj', agent='claude')
        result = folder_graph_build(kv)
        node = result['nodes'][0]
        assert 'kiro' in node['agentIds']
        assert 'claude' in node['agentIds']


class TestGraphEdges:
    def test_same_parent_edge(self, tmp_path):
        kv = make_kv(tmp_path)
        add_obs(kv, '/home/user/proj/src')
        add_obs(kv, '/home/user/proj/tests')
        result = folder_graph_build(kv)
        same_parent = [e for e in result['edges'] if e['type'] == 'same-parent']
        assert len(same_parent) >= 1

    def test_no_duplicate_edges(self, tmp_path):
        kv = make_kv(tmp_path)
        add_obs(kv, '/home/user/proj/src')
        add_obs(kv, '/home/user/proj/tests')
        result = folder_graph_build(kv)
        edge_keys = [(e['source'], e['target'], e['type']) for e in result['edges']]
        assert len(edge_keys) == len(set(edge_keys))

    def test_agent_shared_edge(self, tmp_path):
        kv = make_kv(tmp_path)
        add_obs(kv, '/home/user/proj-a', agent='kiro')
        add_obs(kv, '/home/user/proj-b', agent='kiro')
        result = folder_graph_build(kv)
        agent_edges = [e for e in result['edges'] if e['type'] == 'agent-shared']
        assert len(agent_edges) >= 1

    def test_cross_ref_edge(self, tmp_path):
        kv = make_kv(tmp_path)
        fp_b = 'home/user/proj-b'
        add_obs(kv, '/home/user/proj-a', text=f'Modified files in {fp_b}')
        add_obs(kv, '/home/user/proj-b', text='Normal work')
        result = folder_graph_build(kv)
        cross_ref = [e for e in result['edges'] if e['type'] == 'cross-ref']
        assert len(cross_ref) >= 1