package controller

import (
	"context"
	"sync"
	"time"

	"github.com/QuantumNous/new-api/common"
	"github.com/QuantumNous/new-api/constant"
	"github.com/QuantumNous/new-api/model"
	"github.com/QuantumNous/new-api/service"
	"github.com/QuantumNous/new-api/setting/operation_setting"
)

// RegisterScheduledSystemTasks wires the periodic channel test, upstream model
// update, and async task polling (Midjourney / Suno / video) jobs into the
// system task framework so a DB lease dedups execution across multiple master
// instances and each run is recorded as one task row. Call this before
// service.StartSystemTaskRunner.
func RegisterScheduledSystemTasks() {
	service.RegisterSystemTaskHandler(detectionHandler{})
	service.RegisterSystemTaskHandler(astraSamplingHandler{})
	service.RegisterSystemTaskHandler(channelAvailabilityHandler{})
	service.RegisterSystemTaskHandler(channelTestHandler{})
	service.RegisterSystemTaskHandler(modelUpdateHandler{})
	service.RegisterSystemTaskHandler(midjourneyPollHandler{})
	service.RegisterSystemTaskHandler(asyncTaskPollHandler{})
}

// channelTestHandler runs the scheduled "test all channels" job. Enablement and
// cadence still come from the monitor settings; only the execution path moved
// into the system task runner.
type channelTestHandler struct{}

type channelAvailabilityHandler struct{}

func (channelAvailabilityHandler) Type() string { return model.SystemTaskTypeChannelAvailability }

func (channelAvailabilityHandler) Enabled() bool { return service.AstraAvailabilityEnabled() }

func (channelAvailabilityHandler) Interval() time.Duration {
	return time.Duration(service.AstraAvailabilityIntervalMinutes()) * time.Minute
}

func (channelAvailabilityHandler) ScheduleFromCreation() bool { return true }

func (channelAvailabilityHandler) NewPayload() any { return nil }

func (channelAvailabilityHandler) Run(ctx context.Context, task *model.SystemTask, runnerID string) {
	testUserID, err := resolveChannelTestUserID(nil)
	if err != nil {
		finishSystemTaskHandler(task, runnerID, model.SystemTaskStatusFailed, nil, err)
		return
	}
	channels, err := model.GetAllChannels(0, 0, true, false)
	if err != nil {
		finishSystemTaskHandler(task, runnerID, model.SystemTaskStatusFailed, nil, err)
		return
	}
	selected := make([]*model.Channel, 0, len(channels))
	for _, channel := range channels {
		if channel.Status == common.ChannelStatusEnabled {
			selected = append(selected, channel)
		}
	}
	settings := operation_setting.GetMonitorSetting()
	state := service.ChannelAvailabilityState{Rounds: []service.ChannelAvailabilityRound{}}
	var mu sync.Mutex
	var persistErr error
	ctx, cancel := context.WithCancel(ctx)
	defer cancel()
	disableThreshold := int64(common.ChannelDisableThreshold * 1000)
	if disableThreshold == 0 {
		disableThreshold = 10000000
	}
	summary := runChannelTestWorkers(ctx, selected, settings.ChannelTestConcurrency, func(ctx context.Context, channel *model.Channel) channelTestSummary {
		result := testChannelForHealthCheck(ctx, channel, testUserID, false, disableThreshold)
		if result.Tested == 0 {
			return result
		}
		mu.Lock()
		defer mu.Unlock()
		if persistErr == nil {
			state.Rounds = append(state.Rounds, service.ChannelAvailabilityRound{ChannelID: channel.Id, At: time.Now().Unix(), Success: result.Succeeded == 1})
			persistErr = model.UpdateSystemTaskState(task.TaskID, runnerID, state)
			if persistErr != nil {
				cancel()
			}
		}
		return result
	}, nil)
	if persistErr != nil {
		finishSystemTaskHandler(task, runnerID, model.SystemTaskStatusFailed, summary, persistErr)
		return
	}
	if ctx.Err() != nil {
		finishSystemTaskHandler(task, runnerID, model.SystemTaskStatusFailed, summary, ctx.Err())
		return
	}
	finishSystemTaskHandler(task, runnerID, model.SystemTaskStatusSucceeded, summary, nil)
}

func (channelTestHandler) Type() string { return model.SystemTaskTypeChannelTest }

func (channelTestHandler) Enabled() bool {
	return operation_setting.GetMonitorSetting().AutoTestChannelEnabled
}

func (channelTestHandler) Interval() time.Duration {
	minutes := operation_setting.GetMonitorSetting().AutoTestChannelMinutes
	if minutes <= 0 {
		minutes = 10
	}
	return time.Duration(minutes * float64(time.Minute))
}

func (channelTestHandler) NewPayload() any { return nil }

// channelTestTaskPayload controls one channel_test run. A nil/empty payload is a
// scheduled run, which uses the configured monitor ChannelTestMode and does not
// notify. A manual "test all channels" trigger sets Mode=scheduled_all and
// Notify=true to reproduce the legacy manual behavior (test every channel and
// notify root on completion).
type channelTestTaskPayload struct {
	Mode   string `json:"mode,omitempty"`
	Notify bool   `json:"notify,omitempty"`
}

func (channelTestHandler) Run(ctx context.Context, task *model.SystemTask, runnerID string) {
	payload := channelTestTaskPayload{}
	if err := task.DecodePayload(&payload); err != nil {
		finishSystemTaskHandler(task, runnerID, model.SystemTaskStatusFailed, nil, err)
		return
	}
	summary, err := runChannelTestTask(ctx, payload.Mode, payload.Notify, service.NewSystemTaskProgressReporter(task, runnerID))
	if err != nil {
		finishSystemTaskHandler(task, runnerID, model.SystemTaskStatusFailed, nil, err)
		return
	}
	finishSystemTaskHandler(task, runnerID, model.SystemTaskStatusSucceeded, summary, nil)
}

// modelUpdateHandler runs the scheduled upstream model update detection job.
type modelUpdateHandler struct{}

func (modelUpdateHandler) Type() string { return model.SystemTaskTypeModelUpdate }

func (modelUpdateHandler) Enabled() bool {
	return common.GetEnvOrDefaultBool("CHANNEL_UPSTREAM_MODEL_UPDATE_TASK_ENABLED", true)
}

func (modelUpdateHandler) Interval() time.Duration {
	intervalMinutes := common.GetEnvOrDefault(
		"CHANNEL_UPSTREAM_MODEL_UPDATE_TASK_INTERVAL_MINUTES",
		channelUpstreamModelUpdateTaskDefaultIntervalMinutes,
	)
	if intervalMinutes < 1 {
		intervalMinutes = channelUpstreamModelUpdateTaskDefaultIntervalMinutes
	}
	return time.Duration(intervalMinutes) * time.Minute
}

func (modelUpdateHandler) NewPayload() any { return nil }

// modelUpdateTaskPayload controls one model_update run. A scheduled run
// (Manual=false) respects the per-channel minimum check interval and may
// auto-apply detected models when a channel has auto-sync enabled. A manual
// "detect all" trigger sets Manual=true to reproduce the legacy detect-all
// semantics: force a re-check regardless of the interval and never auto-apply,
// so the admin reviews and applies changes explicitly.
type modelUpdateTaskPayload struct {
	Manual bool `json:"manual,omitempty"`
}

func (modelUpdateHandler) Run(ctx context.Context, task *model.SystemTask, runnerID string) {
	payload := modelUpdateTaskPayload{}
	if err := task.DecodePayload(&payload); err != nil {
		finishSystemTaskHandler(task, runnerID, model.SystemTaskStatusFailed, nil, err)
		return
	}
	summary := runChannelUpstreamModelUpdateTaskOnce(ctx, payload.Manual, !payload.Manual, service.NewSystemTaskProgressReporter(task, runnerID))
	finishSystemTaskHandler(task, runnerID, model.SystemTaskStatusSucceeded, summary, nil)
}

// midjourneyPollHandler runs one Midjourney polling pass per scheduled run.
// Enabled() folds the "are there unfinished tasks?" check into enablement so the
// scheduler creates no row when the system is idle; only when at least one
// Midjourney task is in progress does a row get scheduled.
type midjourneyPollHandler struct{}

func (midjourneyPollHandler) Type() string { return model.SystemTaskTypeMidjourneyPoll }

func (midjourneyPollHandler) Enabled() bool {
	return constant.UpdateTask && model.HasUnfinishedMidjourneyTasks()
}

func (midjourneyPollHandler) Interval() time.Duration { return 15 * time.Second }

func (midjourneyPollHandler) NewPayload() any { return nil }

func (midjourneyPollHandler) Run(ctx context.Context, task *model.SystemTask, runnerID string) {
	summary := runMidjourneyTaskUpdateOnce(ctx, service.NewSystemTaskProgressReporter(task, runnerID))
	finishSystemTaskHandler(task, runnerID, model.SystemTaskStatusSucceeded, summary, nil)
}

// asyncTaskPollHandler runs one async-task (Suno/video) polling pass per
// scheduled run. Like midjourneyPollHandler, Enabled() folds in the unfinished
// task existence check so an idle system schedules no rows.
type asyncTaskPollHandler struct{}

func (asyncTaskPollHandler) Type() string { return model.SystemTaskTypeAsyncTaskPoll }

func (asyncTaskPollHandler) Enabled() bool {
	return constant.UpdateTask && model.HasUnfinishedSyncTasks()
}

func (asyncTaskPollHandler) Interval() time.Duration { return 15 * time.Second }

func (asyncTaskPollHandler) NewPayload() any { return nil }

func (asyncTaskPollHandler) Run(ctx context.Context, task *model.SystemTask, runnerID string) {
	summary := service.RunTaskPollingOnce(ctx, service.NewSystemTaskProgressReporter(task, runnerID))
	finishSystemTaskHandler(task, runnerID, model.SystemTaskStatusSucceeded, summary, nil)
}

func finishSystemTaskHandler(task *model.SystemTask, runnerID string, status model.SystemTaskStatus, result any, runErr error) {
	errorMessage := ""
	if runErr != nil {
		errorMessage = runErr.Error()
	}
	if err := model.FinishSystemTask(task.TaskID, runnerID, status, result, errorMessage); err != nil {
		common.SysLog(common.LogText("system task %s failed to persist result: %v", task.TaskID, err))
	}
}