"""Tests for core history loading and parsing."""

import os
import tempfile
from datetime import datetime

import pytest

from shellhist.core import HistoryEntry, HistoryStore, HistoryLoader


class TestHistoryEntry:
    """Test HistoryEntry dataclass."""

    def test_create_entry(self):
        """Test creating a basic history entry."""
        entry = HistoryEntry(command="git status")
        assert entry.command == "git status"
        assert entry.timestamp is None
        assert entry.line_number == 0
        assert entry.shell_type == "unknown"

    def test_entry_with_timestamp(self):
        """Test creating an entry with timestamp."""
        ts = datetime.now()
        entry = HistoryEntry(command="ls -la", timestamp=ts)
        assert entry.timestamp == ts

    def test_entry_equality(self):
        """Test entry equality based on command."""
        entry1 = HistoryEntry(command="git status")
        entry2 = HistoryEntry(command="git status")
        entry3 = HistoryEntry(command="git log")
        
        assert entry1 == entry2
        assert entry1 != entry3

    def test_entry_hash(self):
        """Test entry hash for use in sets/dicts."""
        entry1 = HistoryEntry(command="git status")
        entry2 = HistoryEntry(command="git status")
        
        entry_set = {entry1, entry2}
        assert len(entry_set) == 1


class TestHistoryStore:
    """Test HistoryStore class."""

    def test_empty_store(self):
        """Test creating an empty store."""
        store = HistoryStore()
        assert len(store.entries) == 0
        assert len(store.command_frequency) == 0

    def test_add_entry(self):
        """Test adding entries to the store."""
        store = HistoryStore()
        entry = HistoryEntry(command="git status")
        
        store.add_entry(entry)
        
        assert len(store.entries) == 1
        assert store.get_frequency("git status") == 1

    def test_frequency_tracking(self):
        """Test command frequency tracking."""
        store = HistoryStore()
        
        for _ in range(3):
            store.add_entry(HistoryEntry(command="git status"))
        
        store.add_entry(HistoryEntry(command="git log"))
        
        assert store.get_frequency("git status") == 3
        assert store.get_frequency("git log") == 1
        assert store.get_frequency("unknown") == 0

    def test_most_frequent(self):
        """Test getting most frequent commands."""
        store = HistoryStore()
        
        store.add_entry(HistoryEntry(command="git status"))
        store.add_entry(HistoryEntry(command="git status"))
        store.add_entry(HistoryEntry(command="git status"))
        store.add_entry(HistoryEntry(command="git log"))
        store.add_entry(HistoryEntry(command="ls"))
        
        most_frequent = store.get_most_frequent(limit=2)
        
        assert most_frequent[0] == ("git status", 3)
        assert most_frequent[1] == ("git log", 1)

    def test_get_unique_commands(self):
        """Test getting unique commands."""
        store = HistoryStore()
        
        store.add_entry(HistoryEntry(command="git status"))
        store.add_entry(HistoryEntry(command="git status"))
        store.add_entry(HistoryEntry(command="git log"))
        
        unique = store.get_unique_commands()
        
        assert len(unique) == 2
        assert "git status" in unique
        assert "git log" in unique


class TestHistoryLoader:
    """Test HistoryLoader class."""

    def test_load_bash_history(self):
        """Test parsing bash history format."""
        with tempfile.NamedTemporaryFile(mode='w', suffix='_bash_history', delete=False) as f:
            f.write("git status\n")
            f.write("git log --oneline\n")
            f.write("ls -la\n")
            f.write("npm install\n")
            temp_path = f.name
        
        try:
            loader = HistoryLoader(history_path=temp_path)
            store = loader.load()
            
            assert len(store.entries) == 4
            assert store.get_unique_commands() == [
                "git status",
                "git log --oneline",
                "ls -la",
                "npm install",
            ]
        finally:
            os.unlink(temp_path)

    def test_load_bash_history_with_timestamps(self):
        """Test parsing bash history with timestamps."""
        with tempfile.NamedTemporaryFile(mode='w', suffix='_bash_history', delete=False) as f:
            f.write("#1700000000\n")
            f.write("git status\n")
            f.write("#1700000001\n")
            f.write("git log\n")
            temp_path = f.name
        
        try:
            loader = HistoryLoader(history_path=temp_path)
            store = loader.load()
            
            assert len(store.entries) == 2
            assert store.entries[0].timestamp is not None
        finally:
            os.unlink(temp_path)

    def test_load_zsh_history(self):
        """Test parsing zsh history format."""
        import os
        with tempfile.NamedTemporaryFile(mode='w', suffix='_zsh_history', delete=False) as f:
            f.write(": 1700000000:0;git status\n")
            f.write(": 1700000001:0;git log --oneline\n")
            f.write("ls -la\n")
            temp_path = f.name
        
        try:
            os.environ["SHELL"] = "/bin/zsh"
            loader = HistoryLoader(history_path=temp_path)
            store = loader.load()
            
            assert len(store.entries) == 3
            assert store.entries[0].timestamp is not None
            del os.environ["SHELL"]
        finally:
            os.unlink(temp_path)

    def test_file_not_found(self):
        """Test error handling for missing file."""
        loader = HistoryLoader(history_path="/nonexistent/path")
        
        with pytest.raises(FileNotFoundError):
            loader.load()

    def test_from_file_convenience_method(self):
        """Test the from_file class method."""
        with tempfile.NamedTemporaryFile(mode='w', suffix='_history', delete=False) as f:
            f.write("echo test\n")
            temp_path = f.name
        
        try:
            store = HistoryLoader.from_file(temp_path)
            assert len(store.entries) == 1
        finally:
            os.unlink(temp_path)