import sys
import unittest
from pathlib import Path


MODULE_DIR = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(MODULE_DIR))

import export_swe_chat


def row(session, turn, prompt, **overrides):
    value = {
        "session_id": session,
        "turn_id": turn,
        "conversation_turn_number": int(turn[1:]),
        "turn_number": int(turn[1:]),
        "turn_type": "user_prompt",
        "role": "user",
        "is_conversational": True,
        "is_continuation": False,
        "content": prompt,
    }
    value.update(overrides)
    return value


class ExportSWEChatTests(unittest.TestCase):
    def test_selects_first_three_orders_dedupes_and_caps_sources(self):
        rows = [
            row("s1", "t3", "third", conversation_turn_number=3),
            row("s1", "t1", "first", conversation_turn_number=1),
            row("s1", "t2", "second", conversation_turn_number=2),
            row("s2", "t1", " first ", conversation_turn_number=1),
            row("s2", "t2", "later", conversation_turn_number=2),
            row("s2", "t3", "later again", conversation_turn_number=3),
            row("s3", "t1", "one"), row("s3", "t2", "two"),
            row("s4", "t1", "another one"), row("s4", "t2", "another two"), row("s4", "t3", "another three"),
        ]
        candidates, funnel = export_swe_chat.select_candidates(
            rows,
            sessions={"s1": ("repo", "user"), "s2": ("repo", "user"), "s4": ("repo", "user")},
            max_per_repo=1, max_per_user=1,
        )
        self.assertEqual(1, len(candidates))
        self.assertEqual(["t1", "t2", "t3"], [turn.turn_id for turn in candidates[0].turns])
        self.assertEqual("first", candidates[0].turns[0].prompt)
        self.assertEqual(1, funnel["rejectedDuplicateFirstPrompt"])
        self.assertEqual(1, funnel["sessionsFewerThanThreeEligiblePrompts"])
        self.assertEqual(1, funnel["rejectedRepoCap"])

    def test_filters_non_user_continuation_empty_and_ambiguous_ordinals(self):
        rows = [
            row("s1", "t1", "x", role="assistant"), row("s1", "t2", "x", is_continuation=True), row("s1", "t3", ""),
            row("s2", "t1", "a", conversation_turn_number=1, turn_number=1), row("s2", "t2", "b", conversation_turn_number=1, turn_number=1), row("s2", "t3", "c", conversation_turn_number=3),
        ]
        candidates, funnel = export_swe_chat.select_candidates(rows, sessions={}, max_per_repo=10, max_per_user=10)
        self.assertEqual([], candidates)
        self.assertEqual(1, funnel["rejectedRole"])
        self.assertEqual(1, funnel["rejectedContinuation"])
        self.assertEqual(1, funnel["rejectedMalformedOrEmpty"])
        self.assertEqual(1, funnel["sessionsAmbiguousTurnOrder"])

    def test_candidate_only_retains_first_prompt_as_student_text(self):
        turns = tuple(export_swe_chat.Turn("s", f"t{index}", index, index, prompt) for index, prompt in enumerate(("first", "second", "third"), start=1))
        value = export_swe_chat.Candidate("s", "r", "u", turns).json("a" * 40)
        self.assertEqual("first", value["prompt"])
        self.assertEqual(["second", "third"], value["teacherContext"])
        self.assertNotIn("second", value["contextPromptHashes"])


if __name__ == "__main__":
    unittest.main()