"""Proposal backend tests (renamed from Propose).

Covers:
- CRUD: create, list, get, update
- propose_code per-project incrementing
- accept → auto-generate story tasks from Essentials (feat_task_id deprecated per BE-PR-010)
- accept with non-open milestone → fail
- reject → status change
- rejected → reopen back to open
- feat_task_id cannot be set manually (deprecated, read-only)
- edit restrictions (only open proposals editable)
- permission checks for accept/reject/reopen
- Legacy /proposes endpoint still works
"""
import pytest
from app.models.milestone import MilestoneStatus
from app.models.task import TaskStatus


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------

def _proposal_url(project_id: int, proposal_id: int | None = None) -> str:
    """Canonical /proposals URL."""
    base = f"/projects/{project_id}/proposals"
    return f"{base}/{proposal_id}" if proposal_id else base


def _legacy_propose_url(project_id: int, propose_id: int | None = None) -> str:
    """Legacy /proposes URL for backward-compat tests."""
    base = f"/projects/{project_id}/proposes"
    return f"{base}/{propose_id}" if propose_id else base


def _essential_url(project_id: int, proposal_id: int) -> str:
    """Essential CRUD URL under a Proposal."""
    return f"/projects/{project_id}/proposals/{proposal_id}/essentials"


def _add_essential(client, project_id: int, proposal_id: int, headers, *,
                   title: str = "Default Essential", type: str = "feature",
                   description: str | None = None) -> dict:
    """Helper: create an Essential under a Proposal (required for accept)."""
    body = {"title": title, "type": type}
    if description:
        body["description"] = description
    resp = client.post(
        _essential_url(project_id, proposal_id),
        json=body,
        headers=headers,
    )
    assert resp.status_code == 201, f"Failed to create essential: {resp.text}"
    return resp.json()


# ===========================================================================
# CRUD
# ===========================================================================

class TestProposalCRUD:
    """Basic create / list / get / update."""

    def test_create_proposal(
        self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        user = make_user()
        project = make_project(owner_id=user.id, project_code="PROJ")
        make_member(project.id, user.id, dev_role.id)

        resp = client.post(
            _proposal_url(project.id),
            json={"title": "New Feature Idea", "description": "Some details"},
            headers=auth_header(user),
        )
        assert resp.status_code == 201
        data = resp.json()
        assert data["title"] == "New Feature Idea"
        assert data["status"] == "open"
        assert data["propose_code"].startswith("PROJ:P")
        assert data["feat_task_id"] is None  # DEPRECATED (BE-PR-010): always None for new proposals

    def test_list_proposals(
        self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        user = make_user()
        project = make_project(owner_id=user.id)
        make_member(project.id, user.id, dev_role.id)

        # Create two proposals
        client.post(_proposal_url(project.id), json={"title": "P1"}, headers=auth_header(user))
        client.post(_proposal_url(project.id), json={"title": "P2"}, headers=auth_header(user))

        resp = client.get(_proposal_url(project.id), headers=auth_header(user))
        assert resp.status_code == 200
        assert len(resp.json()) == 2

    def test_get_proposal(
        self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        user = make_user()
        project = make_project(owner_id=user.id)
        make_member(project.id, user.id, dev_role.id)

        create_resp = client.post(_proposal_url(project.id), json={"title": "P1"}, headers=auth_header(user))
        proposal_id = create_resp.json()["id"]

        resp = client.get(_proposal_url(project.id, proposal_id), headers=auth_header(user))
        assert resp.status_code == 200
        assert resp.json()["title"] == "P1"

    def test_update_proposal_open(
        self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        user = make_user()
        project = make_project(owner_id=user.id)
        make_member(project.id, user.id, dev_role.id)

        create_resp = client.post(_proposal_url(project.id), json={"title": "Old"}, headers=auth_header(user))
        proposal_id = create_resp.json()["id"]

        resp = client.patch(
            _proposal_url(project.id, proposal_id),
            json={"title": "New Title", "description": "Updated"},
            headers=auth_header(user),
        )
        assert resp.status_code == 200
        assert resp.json()["title"] == "New Title"
        assert resp.json()["description"] == "Updated"


# ===========================================================================
# Proposal Code
# ===========================================================================

class TestProposalCode:
    """propose_code increments per project independently."""

    def test_code_increments_per_project(
        self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        user = make_user()
        proj_a = make_project(owner_id=user.id, project_code="ALPHA")
        proj_b = make_project(owner_id=user.id, project_code="BETA")
        make_member(proj_a.id, user.id, dev_role.id)
        make_member(proj_b.id, user.id, dev_role.id)

        # Create 2 in ALPHA
        r1 = client.post(_proposal_url(proj_a.id), json={"title": "A1"}, headers=auth_header(user))
        r2 = client.post(_proposal_url(proj_a.id), json={"title": "A2"}, headers=auth_header(user))

        # Create 1 in BETA
        r3 = client.post(_proposal_url(proj_b.id), json={"title": "B1"}, headers=auth_header(user))

        code1 = r1.json()["propose_code"]
        code2 = r2.json()["propose_code"]
        code3 = r3.json()["propose_code"]

        assert code1.startswith("ALPHA:P")
        assert code2.startswith("ALPHA:P")
        assert code3.startswith("BETA:P")
        # They should be distinct
        assert code1 != code2


# ===========================================================================
# Accept
# ===========================================================================

class TestAccept:
    """accept proposal → create feature story task."""

    def test_accept_success(
        self, client, db, make_user, make_project, make_milestone, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        mgr = make_user()
        project = make_project(owner_id=mgr.id)
        make_member(project.id, mgr.id, mgr_role.id)

        ms = make_milestone(project.id, mgr.id, status=MilestoneStatus.OPEN)

        create_resp = client.post(
            _proposal_url(project.id),
            json={"title": "Cool Feature", "description": "Do something cool"},
            headers=auth_header(mgr),
        )
        proposal_id = create_resp.json()["id"]

        # New accept flow requires at least one Essential (BE-PR-007)
        _add_essential(client, project.id, proposal_id, auth_header(mgr),
                       title="Cool Feature", type="feature", description="Do something cool")

        resp = client.post(
            _proposal_url(project.id, proposal_id) + "/accept",
            json={"milestone_id": ms.id},
            headers=auth_header(mgr),
        )
        assert resp.status_code == 200
        data = resp.json()
        assert data["status"] == "accepted"
        # BE-PR-010: feat_task_id is no longer written by new accept flow
        assert data["feat_task_id"] is None

        # Tasks are tracked via generated_tasks (source_proposal_id)
        assert "generated_tasks" in data
        assert len(data["generated_tasks"]) >= 1

    def test_accept_non_open_milestone_fails(
        self, client, db, make_user, make_project, make_milestone, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        mgr = make_user()
        project = make_project(owner_id=mgr.id)
        make_member(project.id, mgr.id, mgr_role.id)

        ms = make_milestone(project.id, mgr.id, status=MilestoneStatus.FREEZE)

        create_resp = client.post(
            _proposal_url(project.id),
            json={"title": "Feature X"},
            headers=auth_header(mgr),
        )
        proposal_id = create_resp.json()["id"]

        # Add Essential (required for accept per BE-PR-007)
        _add_essential(client, project.id, proposal_id, auth_header(mgr))

        resp = client.post(
            _proposal_url(project.id, proposal_id) + "/accept",
            json={"milestone_id": ms.id},
            headers=auth_header(mgr),
        )
        assert resp.status_code == 400
        assert "open" in resp.json()["detail"].lower()

    def test_accept_already_accepted_fails(
        self, client, db, make_user, make_project, make_milestone, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        mgr = make_user()
        project = make_project(owner_id=mgr.id)
        make_member(project.id, mgr.id, mgr_role.id)

        ms = make_milestone(project.id, mgr.id, status=MilestoneStatus.OPEN)

        create_resp = client.post(
            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
        )
        proposal_id = create_resp.json()["id"]

        # Add Essential (required for accept per BE-PR-007)
        _add_essential(client, project.id, proposal_id, auth_header(mgr))

        # First accept
        client.post(
            _proposal_url(project.id, proposal_id) + "/accept",
            json={"milestone_id": ms.id},
            headers=auth_header(mgr),
        )

        # Second accept should fail
        resp = client.post(
            _proposal_url(project.id, proposal_id) + "/accept",
            json={"milestone_id": ms.id},
            headers=auth_header(mgr),
        )
        assert resp.status_code == 400

    def test_accept_does_not_write_feat_task_id(
        self, client, db, make_user, make_project, make_milestone, seed_roles_and_permissions, make_member, auth_header,
    ):
        """BE-PR-010: new accept flow does NOT populate feat_task_id.

        feat_task_id is deprecated; tasks are now tracked via
        Task.source_proposal_id / source_essential_id.
        """
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        mgr = make_user()
        project = make_project(owner_id=mgr.id)
        make_member(project.id, mgr.id, mgr_role.id)

        ms = make_milestone(project.id, mgr.id, status=MilestoneStatus.OPEN)

        create_resp = client.post(
            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
        )
        proposal_id = create_resp.json()["id"]

        # Add Essential (required for accept per BE-PR-007)
        _add_essential(client, project.id, proposal_id, auth_header(mgr))

        resp = client.post(
            _proposal_url(project.id, proposal_id) + "/accept",
            json={"milestone_id": ms.id},
            headers=auth_header(mgr),
        )
        data = resp.json()
        # feat_task_id should remain None — deprecated field
        assert data["feat_task_id"] is None

        # Re-fetch to confirm persistence
        get_resp = client.get(_proposal_url(project.id, proposal_id), headers=auth_header(mgr))
        assert get_resp.json()["feat_task_id"] is None

    def test_accept_no_permission_fails(
        self, client, db, make_user, make_project, make_milestone, seed_roles_and_permissions, make_member, auth_header,
    ):
        """dev role should not have propose.accept permission."""
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        owner = make_user()
        dev_user = make_user()
        project = make_project(owner_id=owner.id)
        make_member(project.id, owner.id, mgr_role.id)
        make_member(project.id, dev_user.id, dev_role.id)

        ms = make_milestone(project.id, owner.id, status=MilestoneStatus.OPEN)

        # Dev creates the proposal
        create_resp = client.post(
            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(dev_user),
        )
        proposal_id = create_resp.json()["id"]

        # Add Essential (required for accept per BE-PR-007)
        _add_essential(client, project.id, proposal_id, auth_header(dev_user))

        # Dev tries to accept — should fail
        resp = client.post(
            _proposal_url(project.id, proposal_id) + "/accept",
            json={"milestone_id": ms.id},
            headers=auth_header(dev_user),
        )
        assert resp.status_code == 403


# ===========================================================================
# Reject
# ===========================================================================

class TestReject:
    """reject proposal."""

    def test_reject_success(
        self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        mgr = make_user()
        project = make_project(owner_id=mgr.id)
        make_member(project.id, mgr.id, mgr_role.id)

        create_resp = client.post(
            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
        )
        proposal_id = create_resp.json()["id"]

        resp = client.post(
            _proposal_url(project.id, proposal_id) + "/reject",
            json={"reason": "Not needed"},
            headers=auth_header(mgr),
        )
        assert resp.status_code == 200
        assert resp.json()["status"] == "rejected"

    def test_reject_non_open_fails(
        self, client, db, make_user, make_project, make_milestone, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        mgr = make_user()
        project = make_project(owner_id=mgr.id)
        make_member(project.id, mgr.id, mgr_role.id)

        ms = make_milestone(project.id, mgr.id, status=MilestoneStatus.OPEN)

        create_resp = client.post(
            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
        )
        proposal_id = create_resp.json()["id"]

        # Add Essential (required for accept per BE-PR-007)
        _add_essential(client, project.id, proposal_id, auth_header(mgr))

        # Accept first
        client.post(
            _proposal_url(project.id, proposal_id) + "/accept",
            json={"milestone_id": ms.id},
            headers=auth_header(mgr),
        )

        # Now reject should fail
        resp = client.post(
            _proposal_url(project.id, proposal_id) + "/reject",
            json={"reason": "Changed mind"},
            headers=auth_header(mgr),
        )
        assert resp.status_code == 400

    def test_reject_no_permission_fails(
        self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        owner = make_user()
        dev_user = make_user()
        project = make_project(owner_id=owner.id)
        make_member(project.id, owner.id, mgr_role.id)
        make_member(project.id, dev_user.id, dev_role.id)

        create_resp = client.post(
            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(dev_user),
        )
        proposal_id = create_resp.json()["id"]

        resp = client.post(
            _proposal_url(project.id, proposal_id) + "/reject",
            json={"reason": "nah"},
            headers=auth_header(dev_user),
        )
        assert resp.status_code == 403


# ===========================================================================
# Reopen
# ===========================================================================

class TestReopen:
    """reopen rejected proposal."""

    def test_reopen_success(
        self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        mgr = make_user()
        project = make_project(owner_id=mgr.id)
        make_member(project.id, mgr.id, mgr_role.id)

        create_resp = client.post(
            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
        )
        proposal_id = create_resp.json()["id"]

        # Reject first
        client.post(
            _proposal_url(project.id, proposal_id) + "/reject",
            json={"reason": "wait"},
            headers=auth_header(mgr),
        )

        # Reopen
        resp = client.post(
            _proposal_url(project.id, proposal_id) + "/reopen",
            headers=auth_header(mgr),
        )
        assert resp.status_code == 200
        assert resp.json()["status"] == "open"

    def test_reopen_non_rejected_fails(
        self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        mgr = make_user()
        project = make_project(owner_id=mgr.id)
        make_member(project.id, mgr.id, mgr_role.id)

        create_resp = client.post(
            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
        )
        proposal_id = create_resp.json()["id"]

        # Try reopen on open proposal — should fail
        resp = client.post(
            _proposal_url(project.id, proposal_id) + "/reopen",
            headers=auth_header(mgr),
        )
        assert resp.status_code == 400

    def test_reopen_no_permission_fails(
        self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        owner = make_user()
        dev_user = make_user()
        project = make_project(owner_id=owner.id)
        make_member(project.id, owner.id, mgr_role.id)
        make_member(project.id, dev_user.id, dev_role.id)

        create_resp = client.post(
            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(dev_user),
        )
        proposal_id = create_resp.json()["id"]

        # Owner rejects
        client.post(
            _proposal_url(project.id, proposal_id) + "/reject",
            json={"reason": "nah"},
            headers=auth_header(owner),
        )

        # Dev tries to reopen — should fail
        resp = client.post(
            _proposal_url(project.id, proposal_id) + "/reopen",
            headers=auth_header(dev_user),
        )
        assert resp.status_code == 403


# ===========================================================================
# feat_task_id protection (DEPRECATED per BE-PR-010)
# ===========================================================================

class TestFeatTaskIdProtection:
    """feat_task_id is deprecated and read-only; cannot be set by client."""

    def test_update_cannot_set_feat_task_id(
        self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        user = make_user()
        project = make_project(owner_id=user.id)
        make_member(project.id, user.id, dev_role.id)

        create_resp = client.post(
            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(user),
        )
        proposal_id = create_resp.json()["id"]

        # Try to set feat_task_id via PATCH
        resp = client.patch(
            _proposal_url(project.id, proposal_id),
            json={"feat_task_id": "999"},
            headers=auth_header(user),
        )
        assert resp.status_code == 200
        # feat_task_id should still be None — deprecated, read-only (BE-PR-010)
        assert resp.json()["feat_task_id"] is None


# ===========================================================================
# Edit restrictions
# ===========================================================================

class TestEditRestrictions:
    """Proposal editing is only allowed in open status."""

    def test_edit_accepted_proposal_fails(
        self, client, db, make_user, make_project, make_milestone, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        mgr = make_user()
        project = make_project(owner_id=mgr.id)
        make_member(project.id, mgr.id, mgr_role.id)

        ms = make_milestone(project.id, mgr.id, status=MilestoneStatus.OPEN)

        create_resp = client.post(
            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
        )
        proposal_id = create_resp.json()["id"]

        # Add Essential (required for accept per BE-PR-007)
        _add_essential(client, project.id, proposal_id, auth_header(mgr))

        # Accept
        client.post(
            _proposal_url(project.id, proposal_id) + "/accept",
            json={"milestone_id": ms.id},
            headers=auth_header(mgr),
        )

        # Try to edit
        resp = client.patch(
            _proposal_url(project.id, proposal_id),
            json={"title": "Changed"},
            headers=auth_header(mgr),
        )
        assert resp.status_code == 400
        assert "open" in resp.json()["detail"].lower()

    def test_edit_rejected_proposal_fails(
        self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        mgr = make_user()
        project = make_project(owner_id=mgr.id)
        make_member(project.id, mgr.id, mgr_role.id)

        create_resp = client.post(
            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
        )
        proposal_id = create_resp.json()["id"]

        # Reject
        client.post(
            _proposal_url(project.id, proposal_id) + "/reject",
            json={"reason": "no"},
            headers=auth_header(mgr),
        )

        # Try to edit
        resp = client.patch(
            _proposal_url(project.id, proposal_id),
            json={"title": "Changed"},
            headers=auth_header(mgr),
        )
        assert resp.status_code == 400


# ===========================================================================
# Legacy /proposes endpoint backward compatibility
# ===========================================================================

class TestLegacyProposeEndpoint:
    """Verify the old /proposes URL still works."""

    def test_legacy_create_and_list(
        self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        user = make_user()
        project = make_project(owner_id=user.id, project_code="LEG")
        make_member(project.id, user.id, dev_role.id)

        # Create via legacy endpoint
        resp = client.post(
            _legacy_propose_url(project.id),
            json={"title": "Legacy Proposal"},
            headers=auth_header(user),
        )
        assert resp.status_code == 201
        assert resp.json()["title"] == "Legacy Proposal"

        # List via legacy endpoint
        resp = client.get(_legacy_propose_url(project.id), headers=auth_header(user))
        assert resp.status_code == 200
        assert len(resp.json()) >= 1

    def test_legacy_get_and_update(
        self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
    ):
        admin_role, mgr_role, dev_role = seed_roles_and_permissions
        user = make_user()
        project = make_project(owner_id=user.id)
        make_member(project.id, user.id, dev_role.id)

        # Create via new endpoint
        create_resp = client.post(
            _proposal_url(project.id), json={"title": "Cross"}, headers=auth_header(user),
        )
        pid = create_resp.json()["id"]

        # Get via legacy
        resp = client.get(_legacy_propose_url(project.id, pid), headers=auth_header(user))
        assert resp.status_code == 200
        assert resp.json()["title"] == "Cross"

        # Update via legacy
        resp = client.patch(
            _legacy_propose_url(project.id, pid),
            json={"title": "Updated Cross"},
            headers=auth_header(user),
        )
        assert resp.status_code == 200
        assert resp.json()["title"] == "Updated Cross"