const API = require("../../lib/API")
const AccessControl = require("../../lib/AccessControl")
const { BaseStdResponse } = require("../../BaseStdResponse")
const db = require("../../plugin/DataBase/db")
const redis = require('../../plugin/DataBase/Redis')
const simpleGit = require('simple-git')

class GitContributors extends API {
    constructor() {
        super()

        this.setMethod("GET")
        this.setPath("/Repos/Contributors")
    }

    async analyzeGitContributors(repoPath) {
        try {
            // 检查 Redis 中是否已存在缓存日志
            const redisKey = `gitLogs:${repoPath}`
            const cachedLogs = await redis.get(redisKey)

            let logs
            if (cachedLogs)
                logs = JSON.parse(cachedLogs)
            else {
                const git = simpleGit()
                await git.cwd(repoPath)

                // 获取详细日志，带上插入删除统计并排除 merge 提交
                logs = await git.raw([
                    "log",
                    "--no-merges",
                    "--pretty=format:%H|%an|%ae|%ad|%s",
                    "--shortstat"
                ])

                redis.set(redisKey, JSON.stringify(logs), {
                    EX: 172800
                })
            }

            const lines = logs.split("\n")
            const contributors = {}
            let currentAuthor = null

            for (let i = 0; i < lines.length; i++) {
                const line = lines[i].trim()

                if (line.includes("|")) {
                    const [commitHash, name, email, date, ...messageParts] = line.split("|")
                    currentAuthor = email // 用邮箱作为唯一 key 更稳妥
                    if (!contributors[currentAuthor]) {
                        contributors[currentAuthor] = {
                            name,
                            email,
                            commits: 0,
                            linesAdded: 0,
                            linesDeleted: 0,
                            filesChanged: 0,
                            linesChanged: 0 // total changes
                        }
                    }
                    contributors[currentAuthor].commits += 1

                    // 接下来的 shortstat 统计信息在下一行
                    const statLine = lines[i + 1]?.trim() || ""
                    const statMatch = {
                        filesChanged: statLine.match(/(\d+) file[s]? changed/),
                        insertions: statLine.match(/(\d+) insertion[s]?\(\+\)/),
                        deletions: statLine.match(/(\d+) deletion[s]?\(-\)/),
                    }

                    const files = statMatch.filesChanged ? parseInt(statMatch.filesChanged[1], 10) : 0
                    const insertions = statMatch.insertions ? parseInt(statMatch.insertions[1], 10) : 0
                    const deletions = statMatch.deletions ? parseInt(statMatch.deletions[1], 10) : 0

                    contributors[currentAuthor].filesChanged += files
                    contributors[currentAuthor].linesAdded += insertions
                    contributors[currentAuthor].linesDeleted += deletions
                    contributors[currentAuthor].linesChanged += insertions + deletions

                    if (statLine) i++ // 跳过 shortstat 行
                }
            }

            const sorted = Object.values(contributors).sort(
                (a, b) => b.linesChanged - a.linesChanged || b.commits - a.commits
            )

            return sorted
        } catch (err) {
            console.error("分析 Git 贡献者失败:", err)
            throw new Error("分析 Git 贡献者失败")
        }
    }


    async onRequest(req, res) {
        let { uuid, session, id } = req.query

        if ([uuid, session, id].some(value => value === '' || value === null || value === undefined))
            return res.json({
                ...BaseStdResponse.MISSING_PARAMETER
            })

        // 检查 session
        if (!await AccessControl.checkSession(uuid, session))
            return res.status(401).json({
                ...BaseStdResponse.ACCESS_DENIED
            })

        let sql = 'SELECT state, path FROM repos WHERE create_user = ? AND id = ?'
        let r = await db.query(sql, [uuid, id])
        if (!r || r.length === 0)
            return res.json({
                ...BaseStdResponse.ERR,
                msg: '未找到仓库'
            })

        if (r[0].state !== 1 || !r[0].path)
            return res.json({
                ...BaseStdResponse.ERR,
                msg: '仓库未成功克隆！'
            })

        let contributors
        try {
            const cachedContributors = await redis.get(`contributors:${r[0].path}`)
            if (cachedContributors)
                return res.json({
                    ...BaseStdResponse.OK,
                    data: JSON.parse(cachedContributors)
                })
            contributors = await this.analyzeGitContributors(r[0].path)
        } catch (error) {
            this.logger.error('获取仓库开发者失败！' + error.stack)
            return res.json({
                ...BaseStdResponse.ERR,
                msg: '获取仓库开发者失败！'
            })
        }

        res.json({
            ...BaseStdResponse.OK,
            data: contributors
        })
        redis.set(`contributors:${r[0].path}`, JSON.stringify(contributors), {
            EX: 172800
        })
    }
}

module.exports.GitContributors = GitContributors