"""Tests for dotfiles path resolution."""

from pathlib import Path

import pytest

from flow.core.errors import PlanConflict
from flow.domain.dotfiles.models import ModuleRef, Package
from flow.domain.dotfiles.resolution import resolve_all_targets, resolve_package_targets

RESERVED_ROOT = "_root"
HOME = Path("/home/testuser")


def _pkg(name, layer="_shared", files=(), module=None):
    return Package(
        name=name,
        layer=layer,
        package_id=f"{layer}/{name}",
        source_dir=Path(f"/dots/{layer}/{name}"),
        module=module,
        local_files=tuple(files),
    )


class TestResolvePackageTargets:
    def test_simple_file(self):
        pkg = _pkg("zsh", files=[
            (Path("/dots/_shared/zsh/.zshrc"), Path(".zshrc")),
        ])
        targets = resolve_package_targets(pkg, HOME, set())
        assert len(targets) == 1
        assert targets[0].target == HOME / ".zshrc"
        assert targets[0].source == Path("/dots/_shared/zsh/.zshrc")
        assert targets[0].from_module is False

    def test_nested_config(self):
        pkg = _pkg("git", files=[
            (Path("/dots/_shared/git/.config/git/config"), Path(".config/git/config")),
        ])
        targets = resolve_package_targets(pkg, HOME, set())
        assert targets[0].target == HOME / ".config" / "git" / "config"

    def test_root_marker(self):
        pkg = _pkg("dns", files=[
            (Path("/dots/_shared/dns/_root/etc/hosts"), Path("_root/etc/hosts")),
        ])
        targets = resolve_package_targets(pkg, HOME, set())
        assert targets[0].target == Path("/etc/hosts")
        assert targets[0].needs_sudo is True

    def test_root_marker_skipped_when_in_skip_set(self):
        pkg = _pkg("dns", files=[
            (Path("/dots/_shared/dns/_root/etc/hosts"), Path("_root/etc/hosts")),
        ])
        targets = resolve_package_targets(pkg, HOME, {"_root"})
        assert len(targets) == 0

    def test_bare_root_marker_raises(self):
        """A package containing a file literally named `_root` (no children)
        should be rejected, not silently dropped."""
        pkg = _pkg("bad", files=[
            (Path("/dots/_shared/bad/_root"), Path("_root")),
        ])
        with pytest.raises(PlanConflict, match="_root"):
            resolve_package_targets(pkg, HOME, set())

    def test_skip_package_by_name(self):
        pkg = _pkg("nvim", files=[
            (Path("/dots/_shared/nvim/.config/nvim/init.lua"), Path(".config/nvim/init.lua")),
        ])
        targets = resolve_package_targets(pkg, HOME, {"nvim"})
        assert len(targets) == 0

    def test_module_files_linked_under_mount_path(self):
        module = ModuleRef(
            source="https://github.com/org/nvim-config.git",
            ref_type="branch",
            ref_value="main",
            mount_path=Path(".config/nvim"),
            cache_dir=Path("/modules/_shared--nvim"),
            module_files=(
                (Path("/modules/_shared--nvim/init.lua"), Path("init.lua")),
                (Path("/modules/_shared--nvim/lua/plugins.lua"), Path("lua/plugins.lua")),
            ),
        )
        pkg = _pkg("nvim", files=[
            (Path("/dots/_shared/nvim/.local/bin/nvim-wrapper"), Path(".local/bin/nvim-wrapper")),
        ], module=module)

        targets = resolve_package_targets(pkg, HOME, set())

        # Local file outside mount_path
        local_targets = [t for t in targets if not t.from_module]
        assert len(local_targets) == 1
        assert local_targets[0].target == HOME / ".local" / "bin" / "nvim-wrapper"

        # Module files under mount_path
        module_targets = [t for t in targets if t.from_module]
        assert len(module_targets) == 2
        module_target_paths = {t.target for t in module_targets}
        assert HOME / ".config" / "nvim" / "init.lua" in module_target_paths
        assert HOME / ".config" / "nvim" / "lua" / "plugins.lua" in module_target_paths

    def test_module_yaml_file_not_linked(self):
        """The _module.yaml marker itself should never be linked."""
        pkg = _pkg("nvim", files=[
            (Path("/dots/_shared/nvim/.config/nvim/_module.yaml"), Path(".config/nvim/_module.yaml")),
        ], module=ModuleRef(
            source="x", ref_type="branch", ref_value="main",
            mount_path=Path(".config/nvim"),
            cache_dir=Path("/m"), module_files=(),
        ))
        targets = resolve_package_targets(pkg, HOME, set())
        assert not any(t.target.name == "_module.yaml" for t in targets)

    def test_root_level_module_skips_all_local_files(self):
        """When mount_path is '.', all local files are from the module, not dotfiles repo."""
        module = ModuleRef(
            source="x", ref_type="branch", ref_value="main",
            mount_path=Path("."),
            cache_dir=Path("/m"),
            module_files=(
                (Path("/m/init.lua"), Path("init.lua")),
            ),
        )
        pkg = _pkg("nvim", files=[
            (Path("/dots/_shared/nvim/_module.yaml"), Path("_module.yaml")),
            (Path("/dots/_shared/nvim/stale-file.txt"), Path("stale-file.txt")),
        ], module=module)
        targets = resolve_package_targets(pkg, HOME, set())
        # Only module files should appear, local files skipped
        assert len(targets) == 1
        assert targets[0].from_module is True
        assert targets[0].target == HOME / "init.lua"


class TestResolveAllTargets:
    def test_no_conflicts(self):
        pkgs = [
            _pkg("zsh", files=[(Path("/a/.zshrc"), Path(".zshrc"))]),
            _pkg("git", files=[(Path("/a/.gitconfig"), Path(".gitconfig"))]),
        ]
        targets = resolve_all_targets(pkgs, HOME, set())
        assert len(targets) == 2

    def test_duplicate_target_raises(self):
        pkgs = [
            _pkg("zsh", layer="_shared", files=[(Path("/a/.zshrc"), Path(".zshrc"))]),
            _pkg("zsh", layer="work", files=[(Path("/b/.zshrc"), Path(".zshrc"))]),
        ]
        with pytest.raises(PlanConflict):
            resolve_all_targets(pkgs, HOME, set())