"""Findings panel rendering tests.

``render_findings_panel`` is the central widget on the home page and
the Review page; failures here cascade into the user's first
impression. We drive it via a tiny test harness page
(``_findings_panel_harness.py``) so the test can inject findings
directly into session state — no file_uploader simulation needed.

We verify:

- Empty findings list → localized "no issues" success message.
- Findings with tool ids → one expander per tool, labeled in the
  active language.
- Header + severity summary render at the top.
- Untargeted findings land in the "Other / file-level" expander.

Pack-key parity is already pinned by ``test_lang_packs.py``; this
file pins the call sites instead.
"""

from __future__ import annotations

from pathlib import Path

import pandas as pd
import pytest

from streamlit.testing.v1 import AppTest

from .conftest import PROJECT_ROOT, collected_text, with_language

HARNESS_PATH = Path(__file__).resolve().parent / "_findings_panel_harness.py"


def _harness(findings, lang: str = "en") -> AppTest:
    """Build an AppTest of the harness page with ``findings`` pre-stashed."""
    app = AppTest.from_file(str(HARNESS_PATH))
    app.session_state["test_findings"] = findings
    if lang != "en":
        app.session_state["ui_lang"] = lang
    return app


def _make_finding(tool: str = "", **overrides):
    """Build a minimal :class:`Finding` object. ``Finding`` is a frozen
    dataclass; constructor signature is well-pinned by core tests, so
    we use it directly here rather than building dicts."""
    from src.core.analyze import Finding
    kwargs = dict(
        id="test_finding",
        severity="warn",
        tool=tool,
        count=1,
        description="A test finding.",
        column=None,
        samples=[],
        confidence="medium",
        fix_action="",
    )
    kwargs.update(overrides)
    return Finding(**kwargs)


# ---------------------------------------------------------------------------
# Empty findings → success message
# ---------------------------------------------------------------------------

class TestEmptyFindings:
    def test_empty_renders_no_issues_english(self):
        app = _harness([])
        app.run()
        text = collected_text(app)
        assert "No issues detected" in text

    def test_empty_renders_no_issues_spanish(self):
        app = _harness([], lang="es")
        app.run()
        text = collected_text(app)
        assert "No se detectaron problemas" in text


# ---------------------------------------------------------------------------
# Header text
# ---------------------------------------------------------------------------

class TestHeader:
    def test_header_english(self):
        app = _harness([_make_finding(tool="02_text_cleaner")])
        app.run()
        text = collected_text(app)
        assert "Detected issues" in text

    def test_header_spanish(self):
        app = _harness([_make_finding(tool="02_text_cleaner")], lang="es")
        app.run()
        text = collected_text(app)
        assert "Problemas detectados" in text


# ---------------------------------------------------------------------------
# Per-tool grouping → one expander per tool id
# ---------------------------------------------------------------------------

class TestGrouping:
    def test_findings_grouped_into_per_tool_expanders(self):
        findings = [
            _make_finding(tool="02_text_cleaner", id="whitespace_padding"),
            _make_finding(tool="02_text_cleaner", id="nbsp_padding"),
            _make_finding(tool="03_format_standardizer", id="mixed_case_email"),
        ]
        app = _harness(findings)
        app.run()
        labels = [e.label for e in app.expander]
        # Two unique tools → two expanders. Each label carries the
        # tool's display name + finding count.
        text_cleaner_expanders = [lbl for lbl in labels if "Clean Text" in lbl]
        format_expanders = [lbl for lbl in labels if "Standardize Formats" in lbl]
        assert len(text_cleaner_expanders) == 1, (
            f"expected one Clean Text expander; got: {labels}"
        )
        assert len(format_expanders) == 1, (
            f"expected one Standardize Formats expander; got: {labels}"
        )

    def test_tool_names_localize_in_spanish(self):
        findings = [_make_finding(tool="02_text_cleaner")]
        app = _harness(findings, lang="es")
        app.run()
        labels = [e.label for e in app.expander]
        assert any("Limpiar texto" in lbl for lbl in labels), (
            f"Spanish tool name missing; expanders: {labels}"
        )

    def test_finding_count_in_expander_label(self):
        findings = [
            _make_finding(tool="02_text_cleaner", id=f"f{i}")
            for i in range(3)
        ]
        app = _harness(findings)
        app.run()
        labels = [e.label for e in app.expander]
        # Pack template: "{tool} — {n} finding(s)"
        text_cleaner_label = next(l for l in labels if "Clean Text" in l)
        assert "3" in text_cleaner_label, (
            f"expected count '3' in expander label; got {text_cleaner_label!r}"
        )


# ---------------------------------------------------------------------------
# Open-tool button localizes
# ---------------------------------------------------------------------------

class TestOpenToolButton:
    """Each tool section has an ``st.page_link`` to jump to that tool's
    page. AppTest exposes page_links as ``app.button`` entries with
    label ``"Open {tool} →"`` (English) / ``"Abrir {tool} →"`` (Spanish)."""

    def test_open_tool_label_english(self):
        findings = [_make_finding(tool="02_text_cleaner")]
        app = _harness(findings)
        app.run()
        # ``st.page_link`` may show up under ``app.button`` or in the
        # raw markdown. We probe both.
        text = collected_text(app)
        # Pack template: "Open {tool} →"
        assert "Open Clean Text" in text

    def test_open_tool_label_spanish(self):
        findings = [_make_finding(tool="02_text_cleaner")]
        app = _harness(findings, lang="es")
        app.run()
        text = collected_text(app)
        # Pack template: "Abrir {tool} →"
        assert "Abrir Limpiar texto" in text


# ---------------------------------------------------------------------------
# Untargeted findings (file-level) go in the "Other" expander
# ---------------------------------------------------------------------------

class TestUntargetedFindings:
    def test_untargeted_goes_to_other_expander_en(self):
        findings = [
            _make_finding(tool="", id="csv_bom_stripped"),
            _make_finding(tool="02_text_cleaner", id="nbsp_padding"),
        ]
        app = _harness(findings)
        app.run()
        labels = [e.label for e in app.expander]
        # Pack template: "Other / file-level — {n} finding(s)"
        assert any("Other / file-level" in lbl for lbl in labels), (
            f"untargeted expander missing; got: {labels}"
        )

    def test_untargeted_label_spanish(self):
        findings = [_make_finding(tool="", id="csv_bom_stripped")]
        app = _harness(findings, lang="es")
        app.run()
        labels = [e.label for e in app.expander]
        # Spanish pack: "Otros / a nivel de archivo — {n} hallazgo(s)"
        assert any("Otros / a nivel de archivo" in lbl for lbl in labels), (
            f"Spanish 'Other' expander missing; got: {labels}"
        )


# ---------------------------------------------------------------------------
# Severity summary
# ---------------------------------------------------------------------------

class TestSeveritySummary:
    """The panel renders a per-severity summary caption like
    ``⚠️ 2 warn · ℹ️ 1 info``. We pin the icon + count rendering."""

    def test_severity_icons_render(self):
        findings = [
            _make_finding(tool="02_text_cleaner", severity="warn"),
            _make_finding(tool="02_text_cleaner", severity="warn"),
            _make_finding(tool="03_format_standardizer", severity="info"),
        ]
        app = _harness(findings)
        app.run()
        text = collected_text(app)
        # Icons live in the per-language pack ("findings.severity_*").
        # The summary template is shared between languages.
        assert "⚠️" in text or "warn" in text
        # Counts present.
        assert "2 warn" in text or "2  warn" in text