"""
Pipeline presets - Pre-configured pipeline configurations.

Provides PipelinePreset as a unified preset system.
Presets can be loaded from TOML files (presets.toml) or defined in code.

Loading order:
1. Built-in presets.toml in the package
2. User config ~/.config/mainline/presets.toml
3. Local ./presets.toml (overrides earlier)
"""

from dataclasses import dataclass, field
from typing import Any

from engine.pipeline.params import PipelineParams


def _load_toml_presets() -> dict[str, Any]:
    """Load presets from TOML file."""
    try:
        from engine.pipeline.preset_loader import load_presets

        return load_presets()
    except Exception:
        return {}


# Pre-load TOML presets
_YAML_PRESETS = _load_toml_presets()


@dataclass
class PipelinePreset:
    """Pre-configured pipeline with stages and animation.

    A PipelinePreset packages:
    - Initial params: Starting configuration
    - Stages: List of stage configurations to create

    This is the new unified preset that works with the Pipeline class.
    """

    name: str
    description: str = ""
    source: str = "headlines"
    display: str = "terminal"
    camera: str = "scroll"
    effects: list[str] = field(default_factory=list)
    border: bool = False

    def to_params(self) -> PipelineParams:
        """Convert to PipelineParams."""
        params = PipelineParams()
        params.source = self.source
        params.display = self.display
        params.border = self.border
        params.camera_mode = self.camera
        params.effect_order = self.effects.copy()
        return params

    @classmethod
    def from_yaml(cls, name: str, data: dict[str, Any]) -> "PipelinePreset":
        """Create a PipelinePreset from YAML data."""
        return cls(
            name=name,
            description=data.get("description", ""),
            source=data.get("source", "headlines"),
            display=data.get("display", "terminal"),
            camera=data.get("camera", "vertical"),
            effects=data.get("effects", []),
            border=data.get("border", False),
        )


# Built-in presets
DEMO_PRESET = PipelinePreset(
    name="demo",
    description="Demo mode with effect cycling and camera modes",
    source="headlines",
    display="pygame",
    camera="scroll",
    effects=["noise", "fade", "glitch", "firehose"],
)

POETRY_PRESET = PipelinePreset(
    name="poetry",
    description="Poetry feed with subtle effects",
    source="poetry",
    display="pygame",
    camera="scroll",
    effects=["fade"],
)

PIPELINE_VIZ_PRESET = PipelinePreset(
    name="pipeline",
    description="Pipeline visualization mode",
    source="pipeline",
    display="terminal",
    camera="trace",
    effects=[],
)

WEBSOCKET_PRESET = PipelinePreset(
    name="websocket",
    description="WebSocket display mode",
    source="headlines",
    display="websocket",
    camera="scroll",
    effects=["noise", "fade", "glitch"],
)

SIXEL_PRESET = PipelinePreset(
    name="sixel",
    description="Sixel graphics display mode",
    source="headlines",
    display="sixel",
    camera="scroll",
    effects=["noise", "fade", "glitch"],
)

FIREHOSE_PRESET = PipelinePreset(
    name="firehose",
    description="High-speed firehose mode",
    source="headlines",
    display="pygame",
    camera="scroll",
    effects=["noise", "fade", "glitch", "firehose"],
)


# Build presets from YAML data
def _build_presets() -> dict[str, PipelinePreset]:
    """Build preset dictionary from all sources."""
    result = {}

    # Add YAML presets
    yaml_presets = _YAML_PRESETS.get("presets", {})
    for name, data in yaml_presets.items():
        result[name] = PipelinePreset.from_yaml(name, data)

    # Add built-in presets as fallback (if not in YAML)
    builtins = {
        "demo": DEMO_PRESET,
        "poetry": POETRY_PRESET,
        "pipeline": PIPELINE_VIZ_PRESET,
        "websocket": WEBSOCKET_PRESET,
        "sixel": SIXEL_PRESET,
        "firehose": FIREHOSE_PRESET,
    }

    for name, preset in builtins.items():
        if name not in result:
            result[name] = preset

    return result


PRESETS: dict[str, PipelinePreset] = _build_presets()


def get_preset(name: str) -> PipelinePreset | None:
    """Get a preset by name."""
    return PRESETS.get(name)


def list_presets() -> list[str]:
    """List all available preset names."""
    return list(PRESETS.keys())


def create_preset_from_params(
    params: PipelineParams, name: str = "custom"
) -> PipelinePreset:
    """Create a preset from PipelineParams."""
    return PipelinePreset(
        name=name,
        source=params.source,
        display=params.display,
        camera=params.camera_mode,
        effects=params.effect_order.copy() if hasattr(params, "effect_order") else [],
    )