"""任务列表服务端分页：limit/offset/总数/服务端过滤/状态统计。

用真实 HTTP 服务 + 临时 SQLite：建 5 个任务（2 completed、
1 failed、2 queued 交错 prompt），分别断言：
- 无 limit 时旧行为不变：全量、created_at 正序、total=5；
- limit=2&order=desc 时第 1 页是最新的 2 条，total=5；
- offset=2 时第 2 页是接下来 2 条，与第 1 页不重叠；
- status 过滤只回该状态，total 是过滤后计数；
- q 过滤按 id/prompt 子串（不区分大小写）；
- limit=0 / limit=101 / offset=-1 回 400；
- status_counts 是全项目统计，不受当前过滤与分页影响。
"""

import http.client
import json
import os
import sys
import tempfile
import threading
import unittest
from pathlib import Path

try:
    from cloud.auth import AuthStore
    from cloud.server import create_server
except ImportError:
    sys.path.insert(0, str(Path(__file__).resolve().parents[2]))
    from cloud.auth import AuthStore
    from cloud.server import create_server


class ListPaginationTestCase(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.TemporaryDirectory()
        self.db_path = os.path.join(self.tmp.name, "control.db")
        self.auth = AuthStore(self.db_path)
        self.owner_id, self.owner_key = self.auth.create_user("owner")
        self.server = create_server(self.db_path, "127.0.0.1", 0)
        self.port = self.server.server_address[1]
        self.thread = threading.Thread(
            target=self.server.serve_forever, daemon=True)
        self.thread.start()
        status, self.project = self._req(
            "POST", "/projects", {"name": "demo"}, self.owner_key)
        self.assertEqual(status, 201)
        self.ids = []
        for prompt in ["alpha one", "beta two", "alpha three", "gamma four", "alpha five"]:
            status, t = self._req("POST", "/tasks",
                                 {"project_id": self.project["id"], "prompt": prompt},
                                 self.owner_key)
            self.assertEqual(status, 201)
            self.ids.append(t["id"])
        # 直接改库状态：前 2 条 completed，第 3 条 failed，其余 queued。
        import sqlite3
        conn = sqlite3.connect(self.db_path)
        conn.execute("UPDATE tasks SET status='completed' WHERE id IN (?, ?)",
                     (self.ids[0], self.ids[1]))
        conn.execute("UPDATE tasks SET status='failed' WHERE id=?", (self.ids[2],))
        conn.commit()
        conn.close()

    def tearDown(self):
        self.server.shutdown()
        self.server.server_close()
        self.thread.join(timeout=5)
        try:
            self.auth.conn.close()
        except Exception:
            pass
        self.tmp.cleanup()

    def _req(self, method, path, body=None, key=None):
        conn = http.client.HTTPConnection("127.0.0.1", self.port, timeout=10)
        hdrs = {}
        payload = None
        if body is not None:
            payload = json.dumps(body).encode("utf-8")
            hdrs["Content-Type"] = "application/json"
        if key is not None:
            hdrs["X-API-Key"] = key
        try:
            conn.request(method, path, body=payload, headers=hdrs)
            resp = conn.getresponse()
            data = resp.read()
        finally:
            conn.close()
        try:
            parsed = json.loads(data.decode("utf-8")) if data else None
        except ValueError:
            parsed = None
        return resp.status, parsed

    def _list(self, qs=""):
        return self._req("GET", "/tasks?project_id=" + self.project["id"] + qs,
                         None, self.owner_key)

    def test_no_limit_is_old_behaviour(self):
        status, d = self._list()
        self.assertEqual(status, 200)
        self.assertEqual([t["id"] for t in d["tasks"]], self.ids)
        self.assertEqual(d["total"], 5)

    def test_desc_pages_do_not_overlap(self):
        status, p1 = self._list("&limit=2&order=desc")
        self.assertEqual(status, 200)
        self.assertEqual(p1["total"], 5)
        self.assertEqual([t["id"] for t in p1["tasks"]],
                         [self.ids[4], self.ids[3]])
        status, p2 = self._list("&limit=2&offset=2&order=desc")
        self.assertEqual(status, 200)
        self.assertEqual([t["id"] for t in p2["tasks"]],
                         [self.ids[2], self.ids[1]])
        self.assertEqual(set(t["id"] for t in p1["tasks"]).isdisjoint(
            set(t["id"] for t in p2["tasks"])), True)

    def test_status_and_q_filters(self):
        status, d = self._list("&status=completed")
        self.assertEqual(status, 200)
        self.assertEqual(d["total"], 2)
        self.assertEqual(set(t["status"] for t in d["tasks"]), {"completed"})
        status, d = self._list("&q=ALPHA")
        self.assertEqual(status, 200)
        self.assertEqual(d["total"], 3)

    def test_status_counts_ignore_filter_and_page(self):
        status, d = self._list("&status=completed&limit=1&order=desc")
        self.assertEqual(status, 200)
        self.assertEqual(len(d["tasks"]), 1)
        self.assertEqual(d["status_counts"], {
            "completed": 2, "failed": 1, "queued": 2})

    def test_invalid_pagination_is_400(self):
        for qs in ["&limit=0", "&limit=101", "&limit=2&offset=-1", "&limit=abc"]:
            status, _ = self._list(qs)
            self.assertEqual(status, 400, qs)