// internal/skills/retrospective/skill.go
package retrospective

import (
	"context"
	"encoding/json"

	iexec "github.com/mathiasbq/supervisor/internal/exec"
	"github.com/mathiasbq/supervisor/internal/registry"
)

// ExecutorFn allows injecting a test double for the subprocess executor.
type ExecutorFn func(ctx context.Context, req iexec.Request) (iexec.Result, error)

// Config holds retrospective skill configuration.
type Config struct {
	SkillPrompt  string     // content of retrospective.md
	DefaultModel string     // model to use when not specified in args
	SessionsDir  string     // path to brain/sessions/
	ExecutorFn   ExecutorFn // injected executor
}

// Skill implements registry.Skill for the retrospective tool.
type Skill struct {
	cfg Config
}

// New constructs a retrospective Skill.
func New(cfg Config) *Skill { return &Skill{cfg: cfg} }

// Name returns the skill name.
func (s *Skill) Name() string { return "retrospective" }

// Tools returns the MCP tool definitions.
func (s *Skill) Tools() []registry.ToolDef {
	return []registry.ToolDef{
		{
			Name:        "retrospective",
			Description: "Run a retrospective on a completed session. Reads the session log, identifies novel learnings, and writes structured entries to the brain for ingestion. Call at the end of each coding session.",
			InputSchema: json.RawMessage(`{
				"type": "object",
				"required": ["session_id"],
				"properties": {
					"session_id": {"type": "string"},
					"model":      {"type": "string"}
				}
			}`),
		},
	}
}