"""
CLI — user entry point.

Typer interface with -i (input) and -o (output) options.
"""
from __future__ import annotations

import asyncio
import logging
import os
from dataclasses import asdict

import dspy
import typer
from pydantic import ValidationError
from rich.console import Console
from rich.panel import Panel
from rich.table import Table

from prometheus.application.bootstrap import SyntheticBootstrap
from prometheus.application.dto import OptimizationConfig, OptimizationResult
from prometheus.application.evaluator import PromptEvaluator
from prometheus.application.use_cases import OptimizePromptUseCase
from prometheus.infrastructure.file_io import YamlPersistence
from prometheus.infrastructure.judge_adapter import DSPyJudgeAdapter
from prometheus.infrastructure.llm_adapter import DSPyLLMAdapter
from prometheus.infrastructure.proposer_adapter import DSPyProposerAdapter
from prometheus.infrastructure.synth_adapter import DSPySyntheticAdapter

app = typer.Typer(
    name="prometheus",
    help="PROMETHEUS — Prompt evolution without reference data.",
    no_args_is_help=True,
)

console = Console()


@app.command()
def optimize(
    input: str = typer.Option(
        ...,
        "-i",
        "--input",
        help="Path to input YAML config file.",
        exists=True,
        readable=True,
    ),
    output: str = typer.Option(
        "output.yaml",
        "-o",
        "--output",
        help="Path to output YAML result file.",
    ),
    verbose: bool = typer.Option(
        False,
        "-v",
        "--verbose",
        help="Print detailed progress.",
    ),
    max_retries: int = typer.Option(
        3,
        "--max-retries",
        help="Max retry attempts for transient LLM errors (429, timeout, 5xx).",
    ),
    error_strategy: str = typer.Option(
        "retry",
        "--error-strategy",
        help="How to handle errors: skip | retry | abort.",
    ),
    max_concurrency: int = typer.Option(
        5,
        "--max-concurrency",
        help="Max parallel LLM calls for minibatch execution and judging.",
    ),
) -> None:
    """Optimize a prompt without any reference data.

    Usage:
        prometheus optimize -i config.yaml -o result.yaml
    """
    asyncio.run(
        _async_optimize(input, output, verbose, max_retries, error_strategy, max_concurrency)
    )


async def _async_optimize(
    input: str,
    output: str,
    verbose: bool,
    max_retries: int,
    error_strategy: str,
    max_concurrency: int,
) -> None:
    # Configure verbose logging
    if verbose:
        logging.basicConfig(level=logging.INFO, format="[PROMETHEUS] %(message)s")

    console.print(
        Panel.fit(
            "PROMETHEUS — Prompt Evolution Engine",
            subtitle="No reference data required",
        )
    )

    # 1. Load & validate config
    persistence = YamlPersistence()
    raw_config = persistence.read_config(input)

    # CLI flags override config file values
    raw_config.setdefault("max_retries", max_retries)
    raw_config.setdefault("error_strategy", error_strategy)
    raw_config.setdefault("max_concurrency", max_concurrency)
    raw_config["output_path"] = output
    raw_config["verbose"] = verbose

    try:
        config = OptimizationConfig.model_validate(raw_config)
    except ValidationError as exc:
        console.print("[bold red]Configuration error:[/bold red]\n")
        for err in exc.errors():
            loc = " → ".join(str(l) for l in err["loc"])
            console.print(f"  [red]• {loc}: {err['msg']}[/red]")
        raise typer.Exit(code=1) from exc
    console.print(f"[dim]Task: {config.task_description[:80]}...[/dim]")
    console.print(f"[dim]Seed prompt: {config.seed_prompt[:80]}...[/dim]")

    # 2. Create per-model DSPy LM instances
    def _model_lm_kwargs(
        model_api_base: str | None,
        model_api_key_env: str | None,
    ) -> dict:
        """Build kwargs for dspy.LM, using per-model overrides with global fallback."""
        kwargs: dict = {}
        api_base = model_api_base or config.api_base
        api_key_env = model_api_key_env or config.api_key_env
        if api_base:
            kwargs["api_base"] = api_base
        if api_key_env:
            kwargs["api_key"] = os.environ.get(api_key_env, "")
        return kwargs

    task_lm = dspy.LM(
        config.task_model,
        **_model_lm_kwargs(config.task_api_base, config.task_api_key_env),
    )
    judge_lm = dspy.LM(
        config.judge_model,
        **_model_lm_kwargs(config.judge_api_base, config.judge_api_key_env),
    )
    proposer_lm = dspy.LM(
        config.proposer_model,
        **_model_lm_kwargs(config.proposer_api_base, config.proposer_api_key_env),
    )
    synth_lm = dspy.LM(
        config.synth_model,
        **_model_lm_kwargs(config.synth_api_base, config.synth_api_key_env),
    )

    # 3. Build adapters (Dependency Injection — each gets its own LM + retry config)
    synth_adapter = DSPySyntheticAdapter(lm=synth_lm)
    llm_adapter = DSPyLLMAdapter(
        lm=task_lm,
        max_retries=config.max_retries,
        retry_delay_base=config.retry_delay_base,
    )
    judge_adapter = DSPyJudgeAdapter(
        lm=judge_lm,
        max_retries=config.max_retries,
        retry_delay_base=config.retry_delay_base,
        max_concurrency=config.max_concurrency,
    )
    proposer_adapter = DSPyProposerAdapter(
        lm=proposer_lm,
        max_retries=config.max_retries,
        retry_delay_base=config.retry_delay_base,
    )
    bootstrap = SyntheticBootstrap(generator=synth_adapter, seed=config.seed)
    evaluator = PromptEvaluator(
        executor=llm_adapter,
        judge=judge_adapter,
        max_concurrency=config.max_concurrency,
    )
    use_case = OptimizePromptUseCase(
        evaluator=evaluator,
        proposer=proposer_adapter,
        bootstrap=bootstrap,
    )

    # 4. Execute
    with console.status("[bold green]Evolving prompt..."):
        result = await use_case.execute(config)

    # 5. Display results
    _display_result(result)

    # 6. Save
    _save_result(persistence, output, result)
    console.print(f"\n[green]Results saved to {output}[/green]")


def _display_result(result: OptimizationResult) -> None:
    """Display a Rich summary in the terminal."""
    console.print()
    console.print(
        Panel(
            f"[bold green]Optimized Prompt[/bold green]\n\n{result.optimized_prompt}",
            title="Result",
        )
    )
    table = Table(title="Metrics")
    table.add_column("Metric", style="cyan")
    table.add_column("Value", style="bold")
    table.add_row("Initial Score", f"{result.initial_score:.2f}")
    table.add_row("Final Score", f"{result.final_score:.2f}")
    table.add_row("Improvement", f"{result.improvement:+.2f}")
    table.add_row("Iterations", str(result.iterations_used))
    table.add_row("LLM Calls", str(result.total_llm_calls))
    console.print(table)


def _save_result(
    persistence: YamlPersistence,
    path: str,
    result: OptimizationResult,
) -> None:
    """Save the result as YAML."""
    persistence.write_result(path, asdict(result))


@app.command(hidden=True)
def _help() -> None:
    """Internal placeholder to force multi-command Typer behavior."""
    pass


if __name__ == "__main__":
    app()