"""
Spec Commands - Test specification management for the LightWave CLI.

SST Reference: packages/lightwave-core/lightwave/schema/definitions/cli.yaml
Domain: spec (runtime: python)
"""

from __future__ import annotations

from typing import TYPE_CHECKING

if TYPE_CHECKING:
    from typing import Any

from lightwave.cli.runner import CommandError


def show_spec(
    args: list[str],
    *,
    json_output: bool = False,
    verbose: bool = False,
) -> dict[str, Any] | None:
    """
    Show test specification.

    SST: domains.spec.commands[name=show]
    args: [requirement_id]
    """
    if not args:
        raise CommandError("Requirement ID required. Example: lw spec show REQ-001")

    requirement_id = args[0]

    if verbose:
        print(f"Looking up specification: {requirement_id}")

    # TODO: Load specs from SST definitions
    spec = {
        "id": requirement_id,
        "title": f"Specification {requirement_id}",
        "status": "draft",
        "acceptance_criteria": [],
        "test_cases": [],
        "note": "Spec lookup not yet fully implemented",
    }

    if json_output:
        return spec

    print(f"\nSpecification: {spec['id']}")
    print(f"Title: {spec['title']}")
    print(f"Status: {spec['status']}")
    print(spec["note"])

    return None


def create_spec(
    args: list[str],
    *,
    json_output: bool = False,
    dry_run: bool = False,
    verbose: bool = False,
) -> dict[str, Any] | None:
    """
    Create new specification.

    SST: domains.spec.commands[name=create]
    flags: [--task]
    """
    # Parse flags
    task_id = None
    for i, arg in enumerate(args):
        if arg == "--task" and i + 1 < len(args):
            task_id = args[i + 1]

    if verbose:
        print(f"Creating specification (task: {task_id})")

    if dry_run:
        if json_output:
            return {"success": True, "dry_run": True, "task_id": task_id}
        print("[dry-run] Would create specification")
        return None

    # TODO: Implement spec creation
    result = {
        "success": True,
        "message": "Spec creation not yet implemented",
        "task_id": task_id,
    }

    if json_output:
        return result

    print(result["message"])
    return None


def generate_tasks(
    args: list[str],
    *,
    json_output: bool = False,
    dry_run: bool = False,
    verbose: bool = False,
) -> dict[str, Any] | None:
    """
    Generate tasks from story acceptance criteria.

    SST: domains.spec.commands[name=generate-tasks]
    args: [story-id]
    """
    if not args:
        raise CommandError("Story ID required. Example: lw spec generate-tasks e420fe89")

    story_id = args[0]

    if verbose:
        print(f"Generating tasks from story: {story_id}")

    if dry_run:
        if json_output:
            return {"success": True, "dry_run": True, "story_id": story_id}
        print(f"[dry-run] Would generate tasks from story: {story_id}")
        return None

    # TODO: Implement task generation from story
    result = {
        "success": True,
        "story_id": story_id,
        "tasks_created": 0,
        "message": "Task generation not yet implemented",
    }

    if json_output:
        return result

    print(f"Story: {story_id}")
    print(result["message"])
    return None


def validate_production(
    args: list[str],
    *,
    json_output: bool = False,
    verbose: bool = False,
) -> dict[str, Any] | None:
    """
    Validate specs against production behavior.

    SST: domains.spec.commands[name=validate-production]
    args: [domain]
    """
    if not args:
        raise CommandError("Domain required. Example: lw spec validate-production users")

    domain = args[0]

    if verbose:
        print(f"Validating production for domain: {domain}")

    # TODO: Implement production validation
    result = {
        "domain": domain,
        "total_specs": 0,
        "validated": 0,
        "failures": [],
        "message": "Production validation not yet implemented",
    }

    if json_output:
        return result

    print(f"\nDomain: {domain}")
    print(result["message"])
    return None


def spec_coverage(
    args: list[str],
    *,
    json_output: bool = False,
    verbose: bool = False,
) -> dict[str, Any] | None:
    """
    Show spec coverage for domain.

    SST: domains.spec.commands[name=coverage]
    args: [domain]
    """
    domain = args[0] if args else "all"

    if verbose:
        print(f"Calculating spec coverage for: {domain}")

    # TODO: Implement spec coverage calculation
    coverage = {
        "domain": domain,
        "total_requirements": 0,
        "with_specs": 0,
        "with_tests": 0,
        "coverage_percent": 0.0,
        "uncovered": [],
    }

    if json_output:
        return coverage

    print(f"\nSpec Coverage: {domain}")
    print("=" * 50)
    print(f"Total requirements: {coverage['total_requirements']}")
    print(f"With specs: {coverage['with_specs']}")
    print(f"With tests: {coverage['with_tests']}")
    print(f"Coverage: {coverage['coverage_percent']:.1f}%")

    return None
