package tools

import (
	"context"
	"log/slog"
	"strings"
	"time"

	"github.com/modelcontextprotocol/go-sdk/mcp"

	"git.warky.dev/wdevs/amcs/internal/ai"
	"git.warky.dev/wdevs/amcs/internal/config"
	"git.warky.dev/wdevs/amcs/internal/metadata"
	"git.warky.dev/wdevs/amcs/internal/store"
	thoughttypes "git.warky.dev/wdevs/amcs/internal/types"
)

type UpdateTool struct {
	store    *store.DB
	provider ai.Provider
	capture  config.CaptureConfig
	log      *slog.Logger
}

type UpdateInput struct {
	ID       string                       `json:"id" jsonschema:"the thought id"`
	Content  *string                      `json:"content,omitempty" jsonschema:"replacement content for the thought"`
	Metadata thoughttypes.ThoughtMetadata `json:"metadata,omitempty" jsonschema:"metadata fields to merge into the thought"`
	Project  string                       `json:"project,omitempty" jsonschema:"optional project name or id to move the thought into"`
}

type UpdateOutput struct {
	Thought thoughttypes.Thought `json:"thought"`
}

func NewUpdateTool(db *store.DB, provider ai.Provider, capture config.CaptureConfig, log *slog.Logger) *UpdateTool {
	return &UpdateTool{store: db, provider: provider, capture: capture, log: log}
}

func (t *UpdateTool) Handle(ctx context.Context, _ *mcp.CallToolRequest, in UpdateInput) (*mcp.CallToolResult, UpdateOutput, error) {
	id, err := parseUUID(in.ID)
	if err != nil {
		return nil, UpdateOutput{}, err
	}

	current, err := t.store.GetThought(ctx, id)
	if err != nil {
		return nil, UpdateOutput{}, err
	}

	content := current.Content
	var embedding []float32
	mergedMetadata := current.Metadata
	projectID := current.ProjectID

	if in.Content != nil {
		content = strings.TrimSpace(*in.Content)
		if content == "" {
			return nil, UpdateOutput{}, errInvalidInput("content must not be empty")
		}
		embedding, err = t.provider.Embed(ctx, content)
		if err != nil {
			return nil, UpdateOutput{}, err
		}
		extracted, extractErr := t.provider.ExtractMetadata(ctx, content)
		if extractErr != nil {
			t.log.Warn("metadata extraction failed during update, keeping current metadata", slog.String("error", extractErr.Error()))
			mergedMetadata = metadata.MarkMetadataFailed(mergedMetadata, t.capture, time.Now().UTC(), extractErr)
		} else {
			mergedMetadata = metadata.MarkMetadataComplete(extracted, t.capture, time.Now().UTC())
			mergedMetadata.Attachments = current.Metadata.Attachments
		}
	}

	mergedMetadata = metadata.Merge(mergedMetadata, in.Metadata, t.capture)

	if rawProject := strings.TrimSpace(in.Project); rawProject != "" {
		project, err := t.store.GetProject(ctx, rawProject)
		if err != nil {
			return nil, UpdateOutput{}, err
		}
		projectID = &project.ID
	}

	updated, err := t.store.UpdateThought(ctx, id, content, embedding, t.provider.EmbeddingModel(), mergedMetadata, projectID)
	if err != nil {
		return nil, UpdateOutput{}, err
	}

	return nil, UpdateOutput{Thought: updated}, nil
}