system({
    title: "git diff",
    description: "Tools to query a git repository.",
    parameters: {
        cwd: {
            type: "string",
            description: "Current working directory",
            required: false,
        },
    },
})

export default function (ctx: ChatGenerationContext) {
    const { env, defTool } = ctx
    const { vars } = env
    const cwd = vars["system.git_diff.cwd"]
    const client = cwd ? git.client(cwd) : git

    defTool(
        "git_diff",
        "Computes file diffs using the git diff command. If the diff is too large, it returns the list of modified/added files.",
        {
            type: "object",
            properties: {
                base: {
                    type: "string",
                    description:
                        "Base branch, ref, commit sha to compare against.",
                },
                head: {
                    type: "string",
                    description:
                        "Head branch, ref, commit sha to compare. Use 'HEAD' to compare against the current branch.",
                },
                staged: {
                    type: "boolean",
                    description: "Compare staged changes",
                },
                nameOnly: {
                    type: "boolean",
                    description: "Show only file names",
                },
                paths: {
                    type: "array",
                    description: "Paths to compare",
                    items: {
                        type: "string",
                        description: "File path or wildcard supported by git",
                    },
                },
                excludedPaths: {
                    type: "array",
                    description: "Paths to exclude",
                    items: {
                        type: "string",
                        description: "File path or wildcard supported by git",
                    },
                },
            },
        },
        async (args) => {
            const { context, ...rest } = args
            const res = await client.diff({
                llmify: true,
                ...rest,
            })
            return res
        },
        {
            maxTokens: 20000,
        }
    )
}