package tools

import (
	"context"
	"encoding/json"
	"fmt"

	"gitea.d-ma.be/mathias/gitea-mcp/internal/allowlist"
	"gitea.d-ma.be/mathias/gitea-mcp/internal/gitea"
	"gitea.d-ma.be/mathias/gitea-mcp/internal/registry"
)

type FileDelete struct {
	c *gitea.Client
	a *allowlist.Allowlist
}

func NewFileDelete(c *gitea.Client, a *allowlist.Allowlist) *FileDelete {
	return &FileDelete{c: c, a: a}
}

func (t *FileDelete) Descriptor() registry.ToolDescriptor {
	return registry.ToolDescriptor{
		Name:        "file_delete",
		Description: "Delete a file from a repository branch. sha is the current blob SHA (from file_read).",
		InputSchema: json.RawMessage(`{
			"type":"object",
			"properties":{
				"owner":{"type":"string"},
				"name":{"type":"string"},
				"path":{"type":"string"},
				"branch":{"type":"string"},
				"message":{"type":"string"},
				"sha":{"type":"string"}
			},
			"required":["owner","name","path","branch","message","sha"]
		}`),
	}
}

type fileDeleteArgs struct {
	Owner   string `json:"owner"`
	Name    string `json:"name"`
	Path    string `json:"path"`
	Branch  string `json:"branch"`
	Message string `json:"message"`
	Sha     string `json:"sha"`
}

func (t *FileDelete) Call(ctx context.Context, raw json.RawMessage) (json.RawMessage, error) {
	var args fileDeleteArgs
	if err := parseArgs(raw, &args); err != nil {
		return nil, err
	}
	if err := t.a.Check(args.Owner); err != nil {
		return nil, err
	}
	if args.Sha == "" {
		return nil, fmt.Errorf("sha is required: %w", gitea.ErrValidation)
	}
	if args.Message == "" {
		return nil, fmt.Errorf("message is required: %w", gitea.ErrValidation)
	}

	result, err := t.c.DeleteFile(ctx, args.Owner, args.Name, args.Path, gitea.DeleteFileArgs{
		Branch:  args.Branch,
		Message: args.Message,
		Sha:     args.Sha,
	})
	if err != nil {
		return nil, err
	}

	return textOK(map[string]any{
		"commit_sha": result.Commit.Sha,
		"html_url":   result.Commit.HTMLURL,
	})
}