"""Unit tests for ``omnigent session export``."""

from __future__ import annotations

import json
from pathlib import Path
from typing import Any
from unittest.mock import patch

import httpx
import respx
from click.testing import CliRunner

from omnigent.cli import cli

_BASE = "http://localhost:6767"

_SESSION_META = {
    "id": "conv_abc123",
    "title": "test session",
    "status": "idle",
    "created_at": 1700000000,
    "updated_at": 1700000001,
    "agent_id": None,
    "agent_name": None,
    "items": [],
}

_ITEMS_PAGE = {
    "data": [
        {
            "id": "msg_1",
            "type": "message",
            "status": "completed",
            "response_id": "resp_1",
            "role": "user",
            "content": [{"type": "input_text", "text": "hello"}],
        },
        {
            "id": "msg_2",
            "type": "message",
            "status": "completed",
            "response_id": "resp_1",
            "role": "assistant",
            "content": [{"type": "output_text", "text": "hi there"}],
            "model": "my-agent",
        },
    ],
    "first_id": "msg_1",
    "last_id": "msg_2",
    "has_more": False,
}


def _patch_server(base_url: str = _BASE) -> Any:
    """Patch the CLI so it uses *base_url* without spawning a real server."""
    return patch("omnigent.cli._resolve_attach_server", return_value=base_url)


@respx.mock
def test_session_export_writes_jsonl(tmp_path: Path) -> None:
    """Export writes one session_meta line then one item line per item."""
    respx.get(f"{_BASE}/v1/sessions/conv_abc123").mock(
        return_value=httpx.Response(200, json=_SESSION_META)
    )
    respx.get(f"{_BASE}/v1/sessions/conv_abc123/items").mock(
        return_value=httpx.Response(200, json=_ITEMS_PAGE)
    )

    out_file = tmp_path / "out.jsonl"
    runner = CliRunner()
    with _patch_server():
        result = runner.invoke(
            cli,
            ["session", "export", "--id", "conv_abc123", "--output", str(out_file)],
        )

    assert result.exit_code == 0, result.output
    assert out_file.exists()

    lines = [json.loads(line) for line in out_file.read_text().splitlines() if line]
    assert len(lines) == 3  # 1 meta + 2 items

    meta = lines[0]
    assert meta["record_type"] == "session_meta"
    assert meta["id"] == "conv_abc123"
    assert meta["title"] == "test session"

    item_lines = lines[1:]
    assert all(r["record_type"] == "item" for r in item_lines)
    assert [r["role"] for r in item_lines] == ["user", "assistant"]
    assert item_lines[1]["content"] == [{"type": "output_text", "text": "hi there"}]


@respx.mock
def test_session_export_default_filename(tmp_path: Path) -> None:
    """Without --output, the file is named <session_id>.jsonl in cwd."""
    respx.get(f"{_BASE}/v1/sessions/conv_abc123").mock(
        return_value=httpx.Response(200, json=_SESSION_META)
    )
    respx.get(f"{_BASE}/v1/sessions/conv_abc123/items").mock(
        return_value=httpx.Response(200, json={**_ITEMS_PAGE, "data": [], "has_more": False})
    )

    runner = CliRunner()
    with runner.isolated_filesystem(temp_dir=tmp_path), _patch_server():
        result = runner.invoke(cli, ["session", "export", "--id", "conv_abc123"])
        assert result.exit_code == 0, result.output
        default_path = Path("conv_abc123.jsonl")
        assert default_path.exists()
        lines = [json.loads(line) for line in default_path.read_text().splitlines() if line]

    assert len(lines) == 1
    assert lines[0]["record_type"] == "session_meta"
    assert lines[0]["id"] == "conv_abc123"


@respx.mock
def test_session_export_missing_session_errors(tmp_path: Path) -> None:
    """Export of an unknown session id exits non-zero with a clear message."""
    respx.get(f"{_BASE}/v1/sessions/conv_doesnotexist").mock(
        return_value=httpx.Response(404, json={"error": "not found"})
    )

    runner = CliRunner()
    with _patch_server():
        result = runner.invoke(
            cli,
            [
                "session",
                "export",
                "--id",
                "conv_doesnotexist",
                "--output",
                str(tmp_path / "out.jsonl"),
            ],
        )

    assert result.exit_code != 0
    assert "conv_doesnotexist" in result.output


@respx.mock
def test_session_export_items_ordered_ascending(tmp_path: Path) -> None:
    """Items in the JSONL appear in ascending position order (user then assistant)."""
    respx.get(f"{_BASE}/v1/sessions/conv_abc123").mock(
        return_value=httpx.Response(200, json=_SESSION_META)
    )
    respx.get(f"{_BASE}/v1/sessions/conv_abc123/items").mock(
        return_value=httpx.Response(200, json=_ITEMS_PAGE)
    )

    out_file = tmp_path / "ordered.jsonl"
    runner = CliRunner()
    with _patch_server():
        result = runner.invoke(
            cli,
            ["session", "export", "--id", "conv_abc123", "--output", str(out_file)],
        )
    assert result.exit_code == 0, result.output

    records = [json.loads(line) for line in out_file.read_text().splitlines() if line]
    item_records = [r for r in records if r["record_type"] == "item"]
    assert len(item_records) == 2
    assert item_records[0]["role"] == "user"
    assert item_records[1]["role"] == "assistant"


@respx.mock
def test_session_export_pagination(tmp_path: Path) -> None:
    """Export follows has_more cursors to fetch all pages."""
    page1 = {
        "data": [
            {
                "id": "msg_1",
                "type": "message",
                "status": "completed",
                "response_id": "r1",
                "role": "user",
                "content": [],
            }
        ],
        "first_id": "msg_1",
        "last_id": "msg_1",
        "has_more": True,
    }
    page2 = {
        "data": [
            {
                "id": "msg_2",
                "type": "message",
                "status": "completed",
                "response_id": "r1",
                "role": "assistant",
                "content": [],
                "model": "ag",
            }
        ],
        "first_id": "msg_2",
        "last_id": "msg_2",
        "has_more": False,
    }
    respx.get(f"{_BASE}/v1/sessions/conv_abc123").mock(
        return_value=httpx.Response(200, json=_SESSION_META)
    )
    # First call (no after param) → page1; second call (after=msg_1) → page2.
    items_route = respx.get(f"{_BASE}/v1/sessions/conv_abc123/items")
    items_route.side_effect = [
        httpx.Response(200, json=page1),
        httpx.Response(200, json=page2),
    ]

    out_file = tmp_path / "paged.jsonl"
    runner = CliRunner()
    with _patch_server():
        result = runner.invoke(
            cli,
            ["session", "export", "--id", "conv_abc123", "--output", str(out_file)],
        )
    assert result.exit_code == 0, result.output

    records = [json.loads(line) for line in out_file.read_text().splitlines() if line]
    item_records = [r for r in records if r["record_type"] == "item"]
    assert len(item_records) == 2
    assert [r["id"] for r in item_records] == ["msg_1", "msg_2"]