// npm build command

// everything about the installation after the creation of
// the .npm/{name}/{version}/package folder.
// linking the modules into the npm.root,
// resolving dependencies, etc.

// This runs AFTER install or link are completed.

var npm = require("../npm")
  , log = require("./utils/log")
  , rm = require("./utils/rm-rf")
  , chain = require("./utils/chain")
  , fetch = require("./utils/fetch")
  , fs = require("./utils/graceful-fs")
  , path = require("path")
  , semver = require("./utils/semver")
  , mkdir = require("./utils/mkdir-p")
  , lifecycle = require("./utils/lifecycle")
  , readJson = require("./utils/read-json")
  , ini = require("./utils/ini")
  , sys = require("sys")
  , writeShim = require("./utils/write-shim")
  , link = require("./utils/link")
  , linkIfExists = link.ifExists
  , shimIfExists = writeShim.ifExists
  , readInstalled = require("./utils/read-installed")
  , asyncMap = require("./utils/async-map")
  , find = require("./utils/find")
  , loadPackageDefaults = require("./utils/load-package-defaults")
  , exec = require("./utils/exec")

module.exports = build

// pkg is either a "package" folder, or a package.json data obj, or an
// object that has the package.json data on the _data member.
function build (args, cb) {
  readAll(args, function (er, args) {
    if (er) return cb(er)
    // do all preinstalls, then check deps, then install all, then finish up.
    chain
      ( [asyncMap, args, function (a, cb) {
          return lifecycle(a, "preinstall", cb)
        }]
      , [asyncMap, args, function (a, cb) {
          return resolveDependencies(a, cb)
        }]
      , [asyncMap, args, buildStep, 3]
      , [linkDependencies, args]
      , [finishBuild, args]
      , cb
      )
  })
}

function buildStep (pkg, cb) {
  pkg = pkg && pkg._data || pkg
  if (!pkg) return cb(new Error("Invalid package data "+sys.inspect(pkg)))
  linkModules(pkg, path.join(npm.root, pkg.name+"-"+pkg.version), cb)
  linkBins(pkg, cb)
  linkMans(pkg, cb)
}
var autoUpdate = function (pkg, cb) {
  var auto = npm.config.get("update-dependents")
  if (!auto) {
    autoUpdate = function (_, cb) { return cb() }
    return log.verbose(
      "update-dependents disabled by config", "update-dependents", cb)
  }
  pkg = pkg && pkg._data || pkg
  if (auto === "always") {
    return npm.commands["update-dependents"]([pkg], cb)
  }
  readInstalled(pkg.name, function (er, inst) {
    if (er) return cb(er)
    var versions = Object.keys(inst[pkg.name])
                   .filter(function (v) { return v !== pkg.version })
                   .sort(semver.sort)
      , maxHave = versions.pop()
    if (!maxHave) return cb()
    if (!semver.gt(pkg.version, maxHave)) return log.verbose(
      "downgrade, not updating dependencencies", "update-dependents", cb)
    npm.commands["update-dependents"]([pkg], cb)
  })
}
var autoActivate = function (pkg, cb) {
  var auto = npm.config.get("auto-activate")
  if (!auto) {
    autoActivate = function (_, cb) { return cb() }
    return log.verbose("auto-activate", "disabled by config", cb)
  }
  pkg = pkg && pkg._data || pkg
  // get the list of versions of this package.
  readInstalled(pkg.name, function (er, inst) {
    if (er) return cb(er)
    var versions = Object.keys(inst)
    if (auto !== "always" && versions.indexOf("active") !== -1) {
      log("another version already active", "auto-activate")
      log("to activate, do:   npm activate "+
        pkg.name+"@"+pkg.version, "auto-activate")
      return cb()
    }
    var u = pkg.name+"@"+pkg.version
    log(u, "activate")
    npm.commands.activate([u], function (er) {
      // don't rollback the whole install if the activate fails.
      if (er) log.error(er, "Failed to update "+u)
      cb()
    })
  })
}

function readAll (folders, cb) {
  var data = []
    , errState = null
    , f = folders.length
  asyncMap(folders, function (folder, cb) {
    if (typeof folder === "object") return loadPackageDefaults(folder, cb)
    readJson(path.join(folder, "package.json"), function (er, d) {
      // FIXME: in 0.3.0, remove this, and make it the default
      // behavior in read-json.js
      if (!er && d.main && d.modules && d.modules.index) delete d.main
      loadPackageDefaults(d, cb)
    })
  }, cb)
}

// make sure that all the dependencies have been installed.
function resolveDependencies (pkg, cb) {
  if (!pkg) return topCb(new Error("Package not found to resolve dependencies"))
  // link foo-1.0.3 to ROOT/.npm/{pkg}/{version}/dependencies/foo

  asyncMap(pkg.dependencies && Object.keys(pkg.dependencies), function (i, cb) {
    var req = { name:i, version:pkg.dependencies[i] }
    log.verbose(req.name+"@"+req.version, "required")
    // see if we have this thing installed.
    fs.readdir(path.join(npm.dir, req.name), function (er, versions) {
      if (er) return cb(new Error(
        "Required package: "+req.name+"("+req.version+") not found."))
      // TODO: Get the "stable" version if there is one.
      // Look that up from the registry.
      var satis = semver.maxSatisfying(versions, req.version)
      if (satis) return cb(null, {name:req.name, version:satis})
      return cb(new Error(
        "Required package: "+req.name+"("+req.version+") not found. "+
        "(Found: "+JSON.stringify(versions)+")"))
    })
  }, function (er, found) {
    // save the resolved dependencies on the pkg data for later
    pkg._resolvedDeps = found
    cb(er, found)
  })
}

function linkDependencies (args, cb) {
  // at this point, we know that all the packages in the "args" list have
  // been installed, and so have all the dependencies in each of their
  // _resolvedDeps array.
  // link each package's _resolvedDeps properly.
  asyncMap(args, function (pkg, cb) {
    log.verbose("linkDependencies", pkg._id)
    dependentLink(pkg, cb)
    dependencyLink(pkg, cb)
  }, 2, cb)
}
// for each dependency, link this pkg into the proper "dependent" folder
function dependentLink (pkg, cb) {
  asyncMap(pkg._resolvedDeps, function (dep, cb) {
    var dependents = path.join(npm.dir, dep.name, dep.version, "dependents")
      , to = path.join(dependents, pkg.name + "-" + pkg.version)
      , from = path.join(npm.dir, pkg.name, pkg.version)
    link(from, to, cb)
  }, cb)
}


// link each dep into this pkg's "dependencies" folder
function dependencyLink (pkg, cb) {
  pkg.link = pkg.link || {}
  var dependencies = path.join(npm.dir, pkg.name, pkg.version, "dependencies")
  asyncMap(pkg._resolvedDeps, function (dep, cb) {
    var depDir = path.join(npm.dir, dep.name, dep.version, "package")
      , dependsOn = path.join( npm.dir, pkg.name, pkg.version
                             , "dependson", dep.name + "-" + dep.version
                             )
      , fromRoot = path.join(npm.dir, dep.name, dep.version)
      , fromLib = path.join(npm.root, dep.name + "-" + dep.version)
      , toLib = path.join(dependencies, dep.name)
      , linkToLib = (dep.name in pkg.link)
        ? path.join(npm.dir, pkg.name, pkg.version, "package", pkg.link[dep.name])
        : null
    log.silly(fromLib, "dependency")
    log.silly(dep, "dependency")
    log.silly(toLib, "dependency")
    readJson(path.join(depDir, "package.json"), function (er, dep) {
      if (er) return cb(er)
      loadPackageDefaults(dep, function (er, dep) {
        if (er) return cb(er)
        linkModules(dep, toLib, cb)
        linkToLib ? linkModules(dep, linkToLib, cb) : cb()
      })
    })
    link(fromRoot, dependsOn, cb)
  }, 3, cb)
}

// link ROOT/.npm/{name}/{ver}/package/{man} to
// {manroot}/{section}/{man-basename}-{ver}{man-extname}
function linkMans (pkg, cb) {
  log.verbose(pkg._id, "linkMans")
  log.silly(pkg.man, "linkMans")
  var man = pkg.man
    , manroot = npm.config.get("manroot")
    , pkgDir = path.join(npm.dir, pkg.name, pkg.version, "package")
  if (!man || !manroot) return cb()
  exec("manpath", [], null, false, function (er, code, stdout, stderr) {
    var manpath = er ? [] : stdout.trim().split(":")
    if (manpath.indexOf(manroot) === -1) {
      log.warn( "It seems " + manroot + " might not be visible to man\n"
              + "For greater justice, please add it to your man path\n"
              + "See: `man man`"
              , pkg._id + " linkMans"
              )
    }
    asyncMap(man, function (man, cb) {
      var parseMan = man.match(/(.*)\.([0-9]+)(\.gz)?$/)
        , stem = parseMan[1]
        , sxn = parseMan[2]
        , gz = parseMan[3] || ""
        , bn = path.basename(stem)
        , manSrc = path.join( pkgDir, man )
        , manDest = path.join( manroot
                             , "man"+sxn
                             , (bn.indexOf(pkg.name) === 0 ? bn
                               : pkg.name + "-" + bn)
                               + "-" + pkg.version
                               + "." + sxn + gz
                             )
      // ln {cwd}/man {manroot}/man{sxn}/{bn}-{ver}.{sxn}{gz}
      log.silly(manSrc, "manSrc")
      log.silly(manDest, "manDest")
      linkIfExists(manSrc, manDest, cb)
    }, cb)
  })
}

// shim {target}/{module-name} to ROOT/.npm/{name}/{version}/package/{module-path}
function linkModules (pkg, target, cb) {
  log.silly(pkg.modules, "linkModules")
  log.verbose(target, "linkModules")
  var mod = pkg.modules

  // FIXME: remove in 0.3.0, and uncomment this functionality in
  // lib/utils/read-json.js
  if (pkg.main) {
    if (!pkg.modules) pkg.modules = mod = {}
    mod.index = pkg.main
    delete pkg.main
  }

  var versionDir = path.join(npm.dir, pkg.name, pkg.version)
    , pkgDir = path.join(versionDir, "package")

  asyncMap(mod && Object.keys(mod), function (key, cb) {
    writeShim
      ( path.join(pkgDir, mod[key])
      , path.join(target, key.replace(/\.js$/, '')+".js")
      , path.join(versionDir, "dependencies")
      , cb
      )
  }, cb)
}

function linkBins (pkg, cb) {
  if (!pkg.bin) return cb()
  log.verbose(pkg._id, "linkBins")
  var binroot = npm.config.get("binroot")
    , dep = path.join(npm.dir, pkg.name, pkg.version, "dependencies")
  if (!binroot) return cb()
  if (!process.env.PATH || -1 === process.env.PATH.indexOf(binroot)) {
    log.warn("bins installing to "+binroot+", outside PATH")
  }
  asyncMap(Object.keys(pkg.bin).filter(function (i) {
    return i.charAt(0) !== "_"
  }), function (i, cb) {
    log.verbose(i+" "+pkg.bin[i], "linkBin")
    var to = path.join(binroot, i+"-"+pkg.version)
      , from = path.join(npm.dir, pkg.name, pkg.version, "package", pkg.bin[i])
    shimTest(from, to, dep, cb)
  }, log.er(cb, "failed to link bins"))
}

function shimTest (from, to, dep, cb) {
  // if it needs a shim, then call writeShim
  // otherwise, just link it in.
  if (from.match(/\.(node|js)$/)) return writeShim(from, to, dep, cb)
  fs.readFile(from, function (er, data) {
    if (er) return cb(er)
    data = data.toString("ascii")
    var envNode = data.match(/#!(\/usr\/bin\/)?env node/)
      , node = data.match(/#!(\/usr(\/local)?\/bin\/)?node/)
    if (envNode && envNode.index === 0 || node && node.index === 0) {
      return writeShim(from, to, dep, cb)
    }
    return link(from, to, cb)
  })
}

function finishBuild (args, cb) {
  chain(args.map(function (pkg) { return function (cb) {
    chain
      ( [lifecycle, pkg, "install"]
      , [lifecycle, pkg, "postinstall"]
      , [autoActivate, pkg]
      , [autoUpdate, pkg]
      , cb
      )
  }}).concat(args.map(function (pkg) {
    pkg = pkg && pkg._data || pkg
    return [ log, "Success: "+(pkg.name + "@"+pkg.version), "build" ]
  })).concat(cb))
}