# Path: scaffold/artisans/upgrade/artisan.py
# ------------------------------------------
from pathlib import Path
from ...core.artisan import BaseArtisan
from ...interfaces.base import ScaffoldResult, Artifact
from ...interfaces.requests import UpgradeRequest
from ...contracts.heresy_contracts import ArtisanHeresy
from ...genesis.genesis_engine import GenesisEngine
from ...core.kernel.transaction import GnosticTransaction
from ...utils import atomic_write
from .merger import GnosticMerger


# Define Request locally or in interfaces (Preferred)



class UpgradeArtisan(BaseArtisan[UpgradeRequest]):
    """
    =============================================================================
    == THE PHOENIX (V-Ω-EVOLUTION-ENGINE)                                      ==
    =============================================================================
    Upgrades an existing project from a newer template version.
    """

    def execute(self, request: UpgradeRequest) -> ScaffoldResult:
        self.logger.info(f"The Phoenix awakens. Evolving reality from '{request.from_template}'...")

        # 1. Materialize the "New" Reality in memory (Simulation)
        # We invoke Genesis in simulation mode to see what the new template *wants* to create.
        from ...interfaces.requests import GenesisRequest

        # We need the original variables. Check the Chronicle.
        import json
        genesis_json = self.project_root / ".scaffold" / "genesis.json"
        if not genesis_json.exists():
            return self.failure("This project has no genesis memory (.scaffold/genesis.json). Cannot upgrade.")

        old_vars = json.loads(genesis_json.read_text())["variables"]

        sim_req = GenesisRequest(
            blueprint_path=request.from_template,
            project_root=self.project_root,
            variables=old_vars,
            dry_run=True,  # Critical: Don't write yet
            silent=True
        )

        # We need to capture the PLANNED files.
        # We can't easily get the plan from a dry-run result artifact list without running the engine logic.
        # We summon the GenesisEngine directly.
        engine = GenesisEngine(self.project_root, self.engine)
        engine.cli_args = sim_req  # Mock args

        # We manually invoke the Prophet to get the items
        # This mirrors GenesisEngine._conduct_archetype_rite logic
        # For V1, we assume we can get the artifacts from a dry run dispatch
        result = self.engine.dispatch(sim_req)

        if not result.success:
            return self.failure("Failed to simulate new template state.")

        new_reality_items = result.artifacts  # These are what SHOULD be there.

        merger = GnosticMerger()
        changes = []

        # 2. The Transactional Evolution
        with GnosticTransaction(self.project_root, f"Upgrade to {request.from_template}") as tx:
            for artifact in new_reality_items:
                target_path = artifact.path

                # If file exists, Merge. If not, Create.
                if target_path.exists():
                    current_content = ""  # Read lazily inside merger or here?
                    # The artifact doesn't have content in dry run result usually...
                    # We need the CONTENT. The Simulator doesn't return content in artifacts list.
                    # We need the `data` payload or to intercept the write.
                    # ASCENSION: For V1, we simply check structural existence.
                    # A true implementation requires the Simulator to return a VirtualFS map.
                    pass

                    # Placeholder for the complex simulation-content-retrieval logic:
                # We assume we have `new_content` from the simulation.

        return self.success("Phoenix Protocol Initiated (Simulation).")